U.S. patent application number 14/790498 was filed with the patent office on 2015-10-29 for personal cleansing compositions and methods.
The applicant listed for this patent is The Procter & Gamble Company. Invention is credited to Gerald John GUSKEY, Qing STELLA.
Application Number | 20150306014 14/790498 |
Document ID | / |
Family ID | 51787156 |
Filed Date | 2015-10-29 |
United States Patent
Application |
20150306014 |
Kind Code |
A1 |
STELLA; Qing ; et
al. |
October 29, 2015 |
Personal Cleansing Compositions and Methods
Abstract
A personal care composition includes a surfactant, a water
soluble cationic polymer, a hydrophobic benefit agent, and a
hydrophobic cationic polyethylene polymer.
Inventors: |
STELLA; Qing; (Cincinnati,
OH) ; GUSKEY; Gerald John; (Symmes Twp., OH) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
The Procter & Gamble Company |
Cincinnati |
OH |
US |
|
|
Family ID: |
51787156 |
Appl. No.: |
14/790498 |
Filed: |
July 2, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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14049897 |
Oct 9, 2013 |
9101551 |
|
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14790498 |
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Current U.S.
Class: |
424/70.17 ;
424/78.03 |
Current CPC
Class: |
A61K 8/737 20130101;
A61K 8/8152 20130101; A61K 2800/5426 20130101; A61K 8/342 20130101;
A61K 8/42 20130101; A61K 8/9789 20170801; A61K 8/463 20130101; A61K
2800/548 20130101; A61K 8/11 20130101; A61K 8/8164 20130101; A61K
8/20 20130101; A61Q 5/12 20130101; A61K 8/416 20130101; A61Q 19/10
20130101; A61K 2800/594 20130101; A61K 8/9794 20170801; A61Q 5/02
20130101 |
International
Class: |
A61K 8/81 20060101
A61K008/81; A61Q 5/02 20060101 A61Q005/02; A61K 8/97 20060101
A61K008/97; A61K 8/46 20060101 A61K008/46; A61K 8/20 20060101
A61K008/20; A61K 8/41 20060101 A61K008/41; A61Q 5/12 20060101
A61Q005/12; A61K 8/42 20060101 A61K008/42 |
Claims
1. A method of increasing coacervate rheology comprising: combining
a surfactant, a water soluble cationic polymer, a benefit agent,
and a cationic hydrophobic polyethylene polymer to form a personal
care composition; and diluting the personal care composition with
water.
2. The method of claim 1, wherein the personal cleansing
composition is a multi-phase composition comprising a cleansing
phase and a benefit phase, wherein the benefit agent and the
cationic hydrophobic polyethylene polymer are in the cleansing
phase.
3. The method of claim 1, wherein the cationic hydrophobic
polyethylene polymer comprises poly(ethylene-co-DMAEMA).
4. The method of claim 1, wherein the composition comprises a pH of
about 4.5 to about 9.
5. The method of claim 1, wherein the cationic hydrophobic
polyethylene polymer has a viscosity of about 100 cps or more at
120.degree. C.
6. The method of claim 1, wherein the cationic hydrophobic
polyethylene polymer comprises an amino acrylate monomer.
7. The method of claim 6, wherein the amino acrylate monomer
comprises dimethylaminoethyl methacrylate, diethyleaminoethyl
methacrylate, diethylaminoethyl acrylate,
(4-hydroxyl-2,2,6,6-tetra-methylpiperidine) methacrylate, 2-Tert
butyl amino ethyl methacrylate, or a combination thereof.
8. The method of claim 6, wherein the cationic hydrophobic
polyethylene polymer comprises at least about 30% or more of the
acrylate monomer by weight of the hydrophobic cationic polyethylene
polymer.
9. A method of increasing encapsulation of a benefit agent in a
coacervate, comprising: combining a surfactant, a water soluble
cationic polymer, a benefit agent, and a cationic hydrophobic
polyethylene polymer to form a personal care composition; and
diluting the personal care composition with water.
10. The method of claim 9, wherein the composition comprises a pH
of about 4.5 to about 9.
11. The method of claim 9, wherein the cationic hydrophobic
polyethylene polymer has a viscosity of about 100 cps or more at
120.degree. C.
Description
TECHNICAL FIELD
[0001] The present disclosure generally relates to personal
cleansing compositions and methods of enhancing deposition of
hydrophobic benefit agents.
BACKGROUND OF THE INVENTION
[0002] Over time, skin cleansing has become part of a personal
hygiene regimen. The cleansing of the skin allows for the removal
of dirt, debris, bacteria, and a myriad of other things that can
cause harm to the skin or the body. Cleansing is often done with
the aid of a surfactant. The surfactant works to help remove
deposited materials from the skin. Unfortunately, surfactants can
also act to remove good things from the skin as well, like oil. The
oil on the skin helps, for example, to protect the skin from losing
too much moisture. Removal of too much oil can leave the skin
vulnerable to becoming dry. One solution for this problem is to
utilize a milder surfactant. Another solution is to replace what is
removed by depositing a replacement material on the skin.
Historically, however, there has been a struggle to effectively
deposit these replacement materials on the skin, especially in
rinse off products like cleansers. As such, there is a need for
personal care compositions that provide enhanced deposition of
materials on the skin.
SUMMARY OF THE INVENTION
[0003] A personal care composition comprises a cleansing phase
comprising a surfactant and a water soluble cationic polymer, and a
benefit phase comprising a hydrophobic benefit agent and a cationic
hydrophobic polyethylene polymer, wherein the composition has a pH
from about 4.5 to about 9.
[0004] A personal cleansing composition comprises a surfactant,
guar hydroxypropyltrimonium chloride, a hydrophobic benefit agent,
and a cationic hydrophobic polyethylene polymer.
[0005] A personal cleansing composition, comprising: up to about
95% by weight of the composition of a cleansing phase comprising an
anionic surfactant, a co-surfactant, and guar
hydroxypropyltrimonium chloride; and about 20% or less by weight of
the composition of a benefit phase comprising a hydrophobic benefit
agent and poly(ethylene-co-DMAEMA), wherein the
poly(ethylene-co-DMAEMA becomes cationic upon combining the
cleansing phase and benefit phase and the composition has a pH from
about 4.5 to about 9.0.
[0006] These and other combinations will be understood from the
more detailed description below.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1 is a picture of a micrograph showing fluorescently
tagged amino functionality of a cationic polymer in a
coacervate;
[0008] FIG. 2 is a graph showing the rheology of coacervate-soybean
oil-Polymer 1 complex compared to the rheology of
coacervate-soybean oil complex; and
[0009] FIG. 3 is a graph showing a relationship between the ratio
of the % amino monomer and the viscosity of the polymer, and
deposition.
DETAILED DESCRIPTION
I. Definitions
[0010] As used herein, the following terms shall have the meaning
specified thereafter:
[0011] "About" as defined herein accounts for +/-10% of the
specified number.
[0012] "Anhydrous" refers to those compositions, and components
thereof, which are substantially free of water.
[0013] "DMAEMA" refers to dimethylaminoethyl methacrylate.
[0014] "Multiphase" refers to compositions comprising at least two
phases which can be chemically distinct (e.g. a cleansing phase and
a benefit phase). Such phases can be in direct physical contact
with one another. A personal care composition can be a multiphase
personal care composition where phases of the personal care
composition can be blended or mixed to a significant degree, but
still be physically distinct. In these situations, the physical
distinctiveness is undetectable to the naked eye. The personal care
composition can also be a multiphase personal care composition
where the phases are in physical contact and are visually distinct.
Visually distinct phases can take many forms, for example, they can
appear as striped, marbled, etc.
[0015] "Package" refers to any suitable container for a personal
care composition including but not limited to a bottle, tottle,
tube, jar, non-aerosol pump, box, wrapper, and combinations
thereof.
[0016] "Personal care composition" refers to compositions intended
for topical application to skin and/or hair. Personal care
compositions can be rinse-off formulations, in which the product
can be applied topically to the skin and/or hair and then
subsequently rinsed within seconds to minutes from the skin or hair
with water. The product could also be wiped off using a substrate.
The personal care compositions can also be used as shaving aids.
The personal care compositions can be extrudable or dispensable
from a package. Examples of personal care compositions can include
but are not limited to bar soap, shampoo, conditioning shampoo,
body wash, moisturizing body wash, shower gels, skin cleansers,
cleansing milks, in shower body moisturizer, pet shampoo, shaving
preparations, and cleansing compositions used in conjunction with a
disposable cleansing cloth.
[0017] "SLS" refers to sodium lauryl sulfate.
[0018] "STnS" refers to sodium trideceth(n) sulfate, wherein n can
define the average number of moles of ethoxylate per molecule.
[0019] The phrase "substantially free of" as used herein, unless
otherwise specified means that the personal care composition
comprises less than about 5%, less than about 3%, less than about
1%, or even less than about 0.1% of the stated ingredient. The term
"free of" as used herein means that the personal care composition
comprises 0% of the stated ingredient that is the ingredient has
not been added to the personal care composition. However, these
ingredients may incidentally form as a byproduct or a reaction
product of the other components of the personal care
composition.
[0020] The devices, apparatuses, methods, components, and/or
compositions of the present invention can include, consist
essentially of, or consist of, the components of the present
invention as well as other ingredients described herein. As used
herein, "consisting essentially of" means that the devices,
apparatuses, methods, components, and/or compositions may include
additional ingredients, but only if the additional ingredients do
not materially alter the basic and novel characteristics of the
claimed devices, apparatuses, methods, components, and/or
compositions.
[0021] All percentages and ratios used herein are by weight of the
total composition and all measurements made are at 25.degree. C.,
unless otherwise designated.
II. Personal Cleansing Compositions
[0022] As discussed above, personal cleansing compositions are
often used to remove dirt or debris from the skin or hair. In
addition to the dirt and debris, oil (also known as sebum) is also
removed through the cleansing process. While too much sebum on the
skin or hair is unwanted and there is a need to remove sebum to
prevent its build-up on the skin, a certain amount of sebum is good
for the skin and hair as it helps protect them. Sebum can act like
a barrier holding moisture into the skin and hair so that it
doesn't become overly dry.
[0023] Not only do we remove sebum through the cleansing process,
but sometimes individuals do not produce enough sebum from the
start and thus are plagued with dry skin and hair issues. These
types of issues also arise with the change in the weather as
different seasons have different humidity levels. For example,
there is a tendency for the winter months to be more dry and thus
for there to be a higher number of people with dry skin and/or hair
during that time of year.
[0024] While the use of milder surfactants can lessen the impact to
the sebum, there is still a desire to deposit hydrophobic benefit
agents onto the skin to help further decrease the impact of sebum
removal and to especially help those people who may have already
had dry skin or hair to start. Depositing benefit agents onto the
skin during a process which is set-up to remove things from the
skin has always proved a challenge.
[0025] One way to help improve the deposition of benefit agents is
through the use of coacervates. Coacervation is the chemical
process of encapsulation. For personal cleansing compositions, the
coacervation often takes place during the rinsing process as the
addition of water (i.e. dilution) of the personal cleansing
compositions initiates the changes in hydrophobic and electrostatic
interactions which trigger the formation of coacervates. Based on
the chemistry of the system, it is believed the coacervates
encapsulate the benefit agent as they are formed. This
encapsulation results in the benefit agent having a larger particle
size and improved visco-elasticity, both of which are believed to
help improve the deposition of the benefit agent onto skin or
hair.
[0026] One material used to help encourage the formation of
coacervates upon dilution of a personal cleansing composition is a
water soluble cationic polymer. For example, looking at Example 1
below, personal cleansing composition Formulation A contains a
benefit agent (soy bean oil) and no water soluble cationic polymer.
It has an in vitro deposition of 2.0 .mu.g/cm.sup.2 measured per
the Fast Mice Method given in detail below. Comparing that to
Formulation E which with the addition of a water soluble cationic
polymer (guar hydroxypropyltrimonium chloride) increases the in
vitro deposition to 16 .mu.g/cm.sup.2.
[0027] Another material considered for deposition enhancement is
hydrophobic cationic polyethylene polymers. However, if you look at
personal cleansing composition Formulations B-D in Example 1 below,
you see that utilizing a hydrophobic cationic polyethylene polymer
resulted in, in vitro depositions of 2.7, 2.2, and 2.6
.mu.g/cm.sup.2 respectively. Thus, there is only a negligible
increase over the deposition seen without any cationic polymer as
discussed above for Formulation A.
[0028] Surprisingly, the present inventors discovered the addition
of a cationic hydrophobic polymer to personal cleansing
compositions comprising a water soluble cationic polymer
dramatically improved deposition. Inventive formulations F-H in
Example 1 below showed in vitro deposition of 55, 177, and 392
.mu.g/cm.sup.2 respectively. Thus, the deposition of the benefit
agent increased 20 fold in one instance and by several fold at the
minimum.
[0029] Without being limited by theory, it is believed the
increased deposition from the water soluble cationic polymer and
hydrophobic cationic polyethylene polymer combination at least
partially results from an enhanced encapsulation of the benefit
agent in the coacervate. This is illustrated in FIG. 1 which is a
picture of a micrograph where the amino functionality of a cationic
hydrophobic polymer (here, poly(ethylene-co-DMAEMA) is
fluorescently tagged.
[0030] As seen in FIG. 1, the polymer (fluoresced, bright circle)
resides at the interface of the benefit agent (which is dark) and
the coacervate. It is believed at least part of the hydrophobic
portions of the water soluble cationic hydrophobic polyethylene
polymer reside inside the hydrophobic benefit agent while the
cationic portions of the cationic hydrophobic polyethylene polymer
tend to migrate to the interface of the hydrophobic benefit agent
and the coacervate. The integration of the cationic portion of the
hydrophobic polymer into the benefit agent allows for an
interaction of the agent itself with, for example, an anionic
surfactant to more strongly integrate the benefit agent into the
coacervate.
[0031] The stronger interactions between the benefit agent and
coacervate are at least partially contributed to the cationic
charges and the charge mobility on the hydrophobic polyethylene
polymer. In addition to anionic surfactant absorption on the
surface of the benefit agent through hydrophobic interaction, the
cationic hydrophobic polyethylene polymer provides additional
cationic charges that form ion pairs with anionic surfactant
through electrostatic interaction. Furthermore, the charge mobility
is substantially increased as they are attached to a polymer chain.
The higher mobility of the ion pairs enhances the ability of the
benefit agent to integrate into a coacervate. The anionic
surfactant both absorbed on the surface of the benefit agent and
ion paired with the cationic hydrophobic polyethylene polymer
facilitate the integration of the benefit agent into a coacervate.
This is in contrast to when only a water soluble cationic polymer
is present, only the electrostatic interactions of the water
soluble cationic polymer and the anionic surfactant absorbed on the
surface of benefit agent droplets are helping hold the benefit
agent in the coacervate.
[0032] Further, without being limited by theory, it is also
believed the combination of hydrophobic polyethylene and water
soluble cationic polymers in a personal cleansing composition and
the interactions discussed above also result in the enhancement of
the benefit agent coacervate rheology modulus. Coacervate rheology
attributes to the deposition of an entrapped benefit agent.
Deposition enhancing coacervates typically are viscoelastic.
Appropriate viscosity of the coacervate-benefit agent complex,
measured by loss modulus (G''), provides fluidity and spreading
when product is applied to the skin surface under shear. The
elasticity, measured by storage modulus (G'), provides rigidity for
the complex to resist removal forces, like water rinsing, to retain
the complex on the skin or hair. A good balance of G' and G'' is
desired for improved deposition. This is exemplified in FIG. 2
which shows the rheology of a coacervate-soybean oil-Polymer 1
complex compared to the rheology of a coacervate-soybean oil
complex.
[0033] Not only was a difference in deposition discovered with the
addition of a cationic hydrophobic polyethylene polymer, but it has
also been discovered that properties of the hydrophobic
polyethylene polymer itself further influence deposition, as
illustrated in the chart below.
TABLE-US-00001 % DMAEMA Formu- (amino monomer) Polymer lation (by
weight of the Viscosity Depo- (poly(ethylene- used from cationic
hydro- (cps) at sition co-DMAEMA)) Example 1 phobic polymer)
120.degree. C. (.mu.g/cm.sup.2) Polymer 6 F 49% 150 55 Polymer 4 G
34% 160 177 Polymer 1 H 37% 3600 392
[0034] As can be seen from this chart, cationic hydrophobic
polyethylene polymers 6 and 4 have a similar viscosity, but a
dissimilar percentage of amino monomer. This difference in the
amino monomer appears to affect the deposition of the benefit agent
as the formulation containing polymer 6 deposited only 55
.mu.g/cm.sup.2 and the formulations containing polymer 4 deposited
177 .mu.g/cm.sup.2. Thus, it appears a lower % of amino monomer in
the polymer will give more effective deposition of the benefit
agent.
[0035] As can also be seen from the chart, cationic hydrophobic
polymers 4 and 1 have a similar percentage of amino monomer, but a
dissimilar viscosity. This difference in the viscosity appears to
affect the deposition of the benefit agent as the formulation
containing polymer 4 deposited only 177 .mu.g/cm.sup.2 and the
formulation containing polymer 1 deposited 392 .mu.g/cm.sup.2.
Thus, it appears a higher viscosity in the polymer will also give
more effective deposition of the benefit agent.
[0036] As shown in FIG. 3, it also appears a ratio of the % amino
monomer and the viscosity of the polymer could also be predictive
of deposition. Deposition, which we have exemplified with soy bean
oil as the benefit agent, appears to have a reciprocal linear
relationship with the ratio of % amino monomer*100/polymer
viscosity at 120.degree. C., indicating a balanced combination of
polymer chain length and % amino monomer gives deposition
optimization. For example, the ratio for polymer 1 is 1, polymer 4
is 21, and for polymer 6 is 33. A lower % amino monomer and higher
polymer viscosity can be preferred. The ratio of % amino monomer to
polymer viscosity can be, for example, from 0.1 to 50.
[0037] Personal cleansing compositions can be multi-phase or single
phase. While the components for personal cleansing compositions
will be discussed below as being multi-phase for simplicity, the
components for each phase could also be used in a single phase. A
personal cleansing composition can comprise a cleansing phase and a
benefit phase. The cleaning phase and the benefit phase can be
blended. The cleaning phase and the benefit phase can also be
patterned (e.g. striped and/or marbled).
A. CLEANSING PHASE
[0038] A cleansing phase can include a surfactant. The personal
care composition can further comprise from about 0.1% to 20%, by
weight of the rinse-off personal care composition, of a surfactant.
Surfactants can comprise anionic surfactants, nonionic surfactants,
amphoteric surfactants, zwitterionic surfactants, cationic
surfactants, or mixtures thereof. The personal care composition can
include at least one anionic surfactant. A personal care
composition can also comprise, for example, an anionic surfactant,
amphoteric surfactant, and a zwitterionic surfactant. Suitable
amphoteric or zwitterionic surfactants, for example, can include
those described in U.S. Pat. No. 5,104,646 and U.S. Pat. No.
5,106,609.
[0039] Anionic surfactants suitable for use in the cleansing phase
of the present compositions include alkyl and alkyl ether sulfates.
These materials have the respective formula ROSO.sub.3M and
RO(C.sub.2H.sub.4O).sub.xSO.sub.3M, wherein R is alkyl or alkenyl
of from about 8 to about 24 carbon atoms, wherein x is about 1 to
about 10, and M is a water-soluble cation such as ammonium, sodium,
potassium, or triethanolamine. The alkyl ether sulfates are
typically made as condensation products of ethylene oxide and
monohydric alcohols having from about 8 to about 24 carbon atoms. R
may have from about 10 to about 18 carbon atoms in both the alkyl
and alkyl ether sulfates. The alcohols can be derived from fats,
e.g., coconut oil or tallow, or can be synthetic. Lauryl alcohol
and straight chain alcohols derived from coconut oil may be used.
Such alcohols may be reacted with about 1 or about 3 to about 10 or
about 5 molar proportions of ethylene oxide. The resulting mixture
of molecular species may have, for example, an average of 3 moles
of ethylene oxide per mole of alcohol, is sulfated and
neutralized.
[0040] Specific examples of alkyl ether sulfates which may be used
in the cleansing phase are sodium and ammonium salts of coconut
alkyl triethylene glycol ether sulfate; tallow alkyl triethylene
glycol ether sulfate, and tallow alkyl hexaoxyethylene sulfate.
Suitable alkyl ether sulfates are those comprising a mixture of
individual compounds, said mixture having an average alkyl chain
length of from about 10 to about 16 carbon atoms and an average
degree of ethoxylation of from about 1 to about 4 moles of ethylene
oxide.
[0041] Other suitable anionic surfactants include water-soluble
salts of the organic, sulfuric acid reaction products of the
general formula [R.sup.1--SO.sub.3-M], wherein R.sup.1 is chosen
from the group consisting of a straight or branched chain,
saturated aliphatic hydrocarbon radical having from about 8 to
about 24, or about 10 to about 18, carbon atoms; and M is a cation.
Suitable examples are the salts of an organic sulfuric acid
reaction product of a hydrocarbon of the methane series, including
iso-, neo-, ineso-, and n-paraffins, having about 8 to about 24
carbon atoms, preferably about 10 to about 18 carbon atoms and a
sulfonating agent, e.g., SO.sub.3, H.sub.2SO.sub.4, oleum, obtained
according to known sulfonation methods, including bleaching and
hydrolysis. Preferred are alkali metal and ammonium sulfonated
C.sub.10-18 n-paraffins.
[0042] Suitable anionic surfactants for use in the cleansing phase
include ammonium lauryl sulfate, ammonium laureth sulfate,
triethylamine lauryl sulfate, triethylamine laureth sulfate,
triethanolamine lauryl sulfate, triethanolamine laureth sulfate,
monoethanolamine lauryl sulfate, monoethanolamine laureth sulfate,
diethanolamine lauryl sulfate, diethanolamine laureth sulfate,
lauric monoglyceride sodium sulfate, sodium lauryl sulfate, sodium
laureth sulfate, potassium laureth sulfate, sodium lauryl
sarcosinate, sodium lauroyl sarcosinate, lauryl sarcosine, cocoyl
sarcosine, ammonium cocoyl sulfate, ammonium lauroyl sulfate,
sodium cocoyl sulfate, sodium lauroyl sulfate, potassium cocoyl
sulfate, potassium lauryl sulfate, monoethanolamine cocoyl sulfate,
sodium tridecyl benzene sulfonate, sodium dodecyl benzene
sulfonate, and combinations thereof.
[0043] Anionic surfactants with branched alkyl chains such as
sodium trideceth sulfate, for example, may be employed. Mixtures of
anionic surfactants can also be used.
[0044] Amphoteric surfactants can include those that can be broadly
described as derivatives of aliphatic secondary and tertiary amines
in which an aliphatic radical can be straight or branched chain and
wherein an aliphatic substituent can contain from about 8 to about
18 carbon atoms such that one carbon atom can contain an anionic
water solubilizing group, e.g., carboxy, sulfonate, sulfate,
phosphate, or phosphonate. Examples of compounds falling within
this definition can be sodium 3-dodecyl-aminopropionate, sodium
3-dodecylaminopropane sulfonate, sodium lauryl sarcosinate,
N-alkyltaurines such as the one prepared by reacting dodecylamine
with sodium isethionate according to the teaching of U.S. Pat. No.
2,658,072, N-higher alkyl aspartic acids such as those produced
according to the teaching of U.S. Pat. No. 2,438,091, and products
described in U.S. Pat. No. 2,528,378. Other examples of amphoteric
surfactants can include sodium lauroamphoacetate, sodium
cocoamphoactetate, disodium lauroamphoacetate disodium
cocodiamphoacetate, and mixtures thereof. Amphoacetates and
diamphoacetates can also be used.
[0045] Zwitterionic surfactants suitable for use as cleansing
surfactant in the structured aqueous cleansing phase include those
that are broadly described as derivatives of aliphatic quaternary
ammonium, phosphonium, and sulfonium compounds, in which the
aliphatic radicals can be straight or branched chain, and wherein
one of the aliphatic substituents contains from about 8 to about 18
carbon atoms and one contains an anionic group, e.g., carboxy,
sulfonate, sulfate, phosphate, or phosphonate.
[0046] Other zwitterionic surfactants suitable for use in the
cleansing phase include betaines, including high alkyl betaines
such as coco dimethyl carboxymethyl betaine, cocoamidopropyl
betaine, cocobetaine, lauryl amidopropyl betaine, oleyl betaine,
lauryl dimethyl carboxymethyl betaine, lauryl dimethyl
alphacarboxyethyl betaine, cetyl dimethyl carboxymethyl betaine,
lauryl bis-(2-hydroxyethyl) carboxymethyl betaine, stearyl
bis-(2-hydroxypropyl) carboxymethyl betaine, oleyl dimethyl
gammacarboxypropyl betaine, and lauryl
bis-(2-hydroxypropyl)alphacarboxyethyl betaine. The sulfobetaines
may be represented by coco dimethyl sulfopropyl betaine, stearyl
dimethyl sulfopropyl betaine, lauryl dimethyl sulfoethyl betaine,
lauryl bis-(2-hydroxyethyl) sulfopropyl betaine and the like;
amidobetaines and amidosulfobetaines, wherein the
RCONH(CH.sub.2).sub.3 radical is attached to the nitrogen atom of
the betaine are also useful in the present compositions.
[0047] Amphoacetates and diamphoacetates can also be used.
Non-limiting examples of suitable amphoacetates and diamphoacetates
include sodium lauroamphoacetate, sodium cocoamphoactetate,
disodium lauroamphoacetate, and disodium cocodiamphoacetate.
[0048] Cationic surfactants can also be used in the cleansing phase
and may represent less than about 5%, by weight of the cleansing
phase.
[0049] Suitable nonionic surfactants for use in structured aqueous
cleansing phase include condensation products of alkylene oxide
groups (hydrophilic in nature) with an organic hydrophobic
compound, which may be aliphatic or alkyl aromatic in nature.
[0050] Other suitable surfactants or cosurfactants that can
generally be used in a cleansing phase for a rinse-off personal
care composition are described in McCutcheon's: Detergents and
Emulsifiers North American Edition (Allured Publishing Corporation
1947) (1986), McCutcheon's, Functional Materials North American
Edition (Allured Publishing Corporation 1973) (1992) and U.S. Pat.
No. 3,929,678 (filed Aug. 1, 1974).
[0051] The cleansing phase can include a structuring surfactant.
Such a structuring surfactant can be included from about 1% to
about 20%, by weight of the personal care composition; from about
2% to about 15%, by weight of the personal care composition; or
from about 5% to about 10%, by weight of the personal care
composition. Such a structuring surfactant can include sodium
trideceth(n) sulfate, hereinafter STnS, wherein n defines the
average moles of ethoxylation. n can range, for example, from about
0 to about 3; n can range from about 0.5 to about 2.7; from about
1.1 to about 2.5; from about 1.8 to about 2.2; or n can be about 2.
When n is less than 3, STnS can provide improved stability,
improved compatibility of benefit agents within the rinse-off
personal care compositions, and/or increased mildness of the
rinse-off personal care compositions, such described benefits of
STnS are disclosed in U.S. Patent Application Pub. No.
2012/0009285.
[0052] The personal care composition can further comprise from
about 0.1% to 20%, by weight of the personal care composition, of a
cosurfactant. Cosurfactants can comprise amphoteric surfactants,
zwitterionic surfactants, or mixtures thereof. Examples of these
types of surfactant are discussed above.
[0053] The personal care composition can also comprise a water
soluble cationic polymer. The water soluble cationic polymer can be
present from about 0.001 to about 3 percent by weight of the
personal care composition. The water soluble cationic polymer can
also be present from about 0.05 to about 2 percent by weight of the
personal care composition. The water soluble cationic polymer can
also be present from about 0.1 to about 1 by weight of the personal
care composition. The polymer may be in one or more phases as a
deposition aid for the benefit agents described herein. Suitable
cationic deposition polymers for use in the compositions of the
present invention contain, for example, cationic
nitrogen-containing moieties such as quaternary ammonium or
cationic protonated amino moieties. The cationic protonated amines
can be primary, secondary, or tertiary amines depending upon the
particular species and the selected pH of the personal care
composition.
[0054] Nonlimiting examples of cationic deposition polymers for use
in compositions include polysaccharide polymers, such as cationic
cellulose derivatives. The cationic cellulose polymers can be, for
example, the salts of hydroxyethyl cellulose reacted with trimethyl
ammonium substituted epoxide, referred to in the industry (CTFA) as
Polyquaternium 10 which are available from Amerchol Corp. (Edison,
N.J., USA) in their Polymer KG, JR and LR series of polymers. The
water soluble cationic polymer comprises, for example, KG-30M.
Other suitable cationic deposition polymers include cationic guar
gum derivatives, such as guar hydroxypropyltrimonium chloride,
specific examples of which include the Jaguar series (preferably
Jaguar C-17) commercially available from Rhodia Inc., and N-Hance
polymer series commercially available from Ashland.
[0055] The water soluble cationic polymer can comprise, for
example, a cationic guar. In one example, the cationic guar
comprises guar hydroxypropyltrimonium chloride. The guar
hydroxypropyltrimonium chloride can comprise, for example,
N-Hance.TM. CG-17 Cationic Guar. The cationic guar can be, for
example, selected from a group consisting of N-Hance.TM. 3196,
Jaguar C-500, Jaguar C-17, and a combination thereof.
[0056] The water soluble cationic polymer can also comprise
synthetic polyacrylamides. Examples of suitable synthetic
polyacrylamides include polyquaternium 76 and
Polymethylene-bis-acrylamide methacrylamido propyltrimethyl
ammonium chloride (PAMMAPTAC, AM:MAPTAC ratio 88:12. In one
example, the water soluble cationic polymer comprises
PAM/MAPTAC.
[0057] A cleansing phase of a personal care composition can also
include an associative polymer. Such associative polymer can be a
crosslinked, alkali swellable, associative polymer comprising
acidic monomers and associative monomers with hydrophobic end
groups, whereby the associative polymer comprises a percentage
hydrophobic modification and a hydrophobic side chain comprising
alkyl functional groups. Without intending to be limited by theory,
it is believed the acidic monomers can contribute to an ability of
the associative polymer to swell in water upon neutralization of
acidic groups; and associative monomers anchor the associative
polymer into structured surfactant hydrophobic domains, e.g.,
lamellae, to confer structure to the surfactant phase and keep the
associative polymer from collapsing and losing effectiveness in a
presence of an electrolyte.
[0058] The crosslinked, associative polymer can comprise a
percentage hydrophobic modification, which is a mole percentage of
monomers expressed as a percentage of a total number of all
monomers in a polymer backbone, including both acidic and other
non-acidic monomers. Percentage hydrophobic modification of the
associative polymer, hereafter % HM, can be determined by the ratio
of monomers added during synthesis, or by analytical techniques
such as proton nuclear magnetic resonance (NMR). Associative alkyl
side chains can comprise, for example, butyl, propyl, stearyl,
steareth, cetyl, lauryl, laureth, octyl, behenyl, beheneth,
steareth, or other linear, branched, saturated, or unsaturated
alkyl or alketh hydrocarbon side chains. The acidic monomer can
comprise any acid functional group, for example sulfate, sulfonate,
carboxylate, phosphonate, or phosphate or mixtures of acid groups.
The acidic monomer can comprise, for example, a carboxylate,
alternatively the acidic monomer is an acrylate, including acrylic
acid and/or methacrylic acid. The acidic monomer comprises a
polymerizable structure, e.g., vinyl functionality. Mixtures of
acidic monomers, for example acrylic acid and methacrylic acid
monomer mixtures, are useful.
[0059] The associative monomer can comprise a hydrophobic end group
and a polymerizable component, e.g., vinyl, which can be attached.
The hydrophobic end group can be attached to the polymerizable
component, hence to the polymer chain, by different means but can
be attached by an ether or ester or amide functionality, such as an
alkyl acrylate or a vinyl alkanoate monomer. The hydrophobic end
group can also be separated from the chain, for example, by an
alkoxy ligand such as an alkyl ether. The associative monomer can
be, for example, an alkyl ester, an alkyl (meth)acrylate, where
(meth)acrylate is understood to mean either methyl acrylate or
acrylate, or mixtures of the two.
[0060] The hydrophobic end group of the associative polymer can be
incompatible with the aqueous phase of the composition and can
associate with lathering surfactant hydrophobe components. Without
intending to be limited by theory, it is believed that longer alkyl
chains of structuring polymer hydrophobe end groups can increase
incompatibility with the aqueous phase to enhance structure,
whereas somewhat shorter alkyl chains having carbon numbers closely
resembling lathering surfactant hydrophobes (e.g., 12 to 14
carbons) or multiples thereof (for bilayers, e.g.) can also be
effective. An ideal range of hydrophobic end group carbon numbers
combined with an optimal percentage of hydrophobic monomers
expressed as a percentage of the polymer backbone can provide
increased structure to the lathering, structured surfactant
composition at low levels of polymer structurant.
[0061] The associative polymer can be Aqupec SER-300 made by
Sumitomo Seika of Japan, which is Acrylates/C10-30 alkyl acrylate
crosspolymer and comprises stearyl side chains with less than about
1% HM. Other preferred associative polymers can comprise stearyl,
octyl, decyl and lauryl side chains. Preferred associative polymers
are Aqupec SER-150 (acrylates/C10-30 alkyl acrylates crosspolymer)
comprising about C18 (stearyl) side chains and about 0.4% HM, and
Aqupec HV-701EDR which comprises about C8 (octyl) side chains and
about 3.5% HM. In another example, the associative polymer can be
Stabylen 30 manufactured by 3V Sigma S.p.A., which has branched
isodecanoate hydrophobic associative side chains.
[0062] Other optional additives can be included in the cleaning
phase, including for example an emulsifier (e.g., non-ionic
emulsifier) and electrolytes. Suitable emulsifiers and electrolytes
are described in U.S. patent application Ser. No. 13/157,665.
B. BENEFIT PHASE
[0063] As noted herein, personal care compositions can include a
benefit phase. The benefit phase can be hydrophobic and/or
anhydrous. The benefit phase can also be substantially free of or
free of surfactant.
[0064] The benefit phase can also include a cosmetic benefit agent.
In particular, the benefit phase can comprise from about 0.1% to
about 50%, by weight of the rinse-off personal care composition, of
the benefit agent. The benefit phase can include, for example, from
about 0.5% to about 20%, by weight of the rinse-off personal care
composition, of the benefit agent. Examples of some suitable
benefit agents include, for example, petrolatum, glyceryl
monooleate, and mixtures thereof. Other suitable benefit agents are
described in U.S. patent application Ser. No. 13/157,665.
[0065] The hydrophobic component can be, for example, a
water-dispersible, non-volatile liquid. The water-dispersible,
non-volatile liquid benefit agents can have a Vaughn Solubility
Parameter (VSP) ranging from about 5 to about 14. Non-limiting
examples of hydrophobic benefit materials having VSP values ranging
from about 5 to about 14 include the following: Cyclomethicone
(5.9), Squalene (6.0), Isopropyl Palmitate (7.8), Isopropyl
Myristate (8.0), Castor Oil (8.9), Cholesterol (9.6), Butylene
Glycol (13.2), soy bean oil, olive oil (7.87), mineral oil (7.1),
and combinations thereof.
[0066] The hydrophobic benefit agents can have a viscosity less
than 5000 cP measured at 25.degree. C.
[0067] The benefit phase can typically comprise one or more benefit
agents, as set forth above. Additional examples of benefit agents
can include water insoluble or hydrophobic benefit agents.
[0068] Non-limiting examples of glycerides suitable for use as
benefit agents herein can include castor oil, safflower oil, corn
oil, walnut oil, peanut oil, olive oil, cod liver oil, almond oil,
avocado oil, palm oil, sesame oil, soybean oil, vegetable oils,
sunflower seed oil, vegetable oil derivatives, coconut oil and
derivatized coconut oil, cottonseed oil and derivatized cottonseed
oil, jojoba oil, cocoa butter, petrolatum, mineral oil, and
combinations thereof.
[0069] Non-limiting examples of alkyl esters suitable for use as
benefit agents herein can include isopropyl esters of fatty acids
and long chain esters of long chain (i.e. C10-C24) fatty acids,
e.g., cetyl ricinoleate, non-limiting examples of which can include
isopropyl palmitate, isopropyl myristate, cetyl riconoleate, and
stearyl riconoleate. Other example can include hexyl laurate,
isohexyl laurate, myristyl myristate, isohexyl palmitate, decyl
oleate, isodecyl oleate, hexadecyl stearate, decyl stearate,
isopropyl isostearate, diisopropyl adipate, diisohexyl adipate,
dihexyldecyl adipate, diisopropyl sebacate, acyl isononanoate
lauryl lactate, myristyl lactate, cetyl lactate, and combinations
thereof.
[0070] Non-limiting examples of alkenyl esters suitable for use as
benefit agents herein can include oleyl myristate, oleyl stearate,
oleyl oleate, and combinations thereof.
[0071] Non-limiting examples of polyglycerin fatty acid esters
suitable for use as benefit agents herein can include decaglyceryl
distearate, decaglyceryl diisostearate, decaglyceryl monomyriate,
decaglyceryl monolaurate, hexaglyceryl monooleate, and combinations
thereof.
[0072] Non-limiting examples of lanolin and lanolin derivatives
suitable for use as benefit agents herein can include lanolin,
lanolin oil, lanolin wax, lanolin alcohols, lanolin fatty acids,
isopropyl lanolate, acetylated lanolin, acetylated lanolin
alcohols, lanolin alcohol linoleate, lanolin alcohol riconoleate,
and combinations thereof.
[0073] Non-limiting examples of silicone oils suitable for use as
hydrophobic skin benefit agents herein can include dimethicone
copolyol, dimethylpolysiloxane, diethylpolysiloxane, mixed C1-C30
alkyl polysiloxanes, phenyl dimethicone, dimethiconol, and
combinations thereof. Nonlimiting examples of silicone oils useful
herein are described in U.S. Pat. No. 5,011,681. Still other
suitable hydrophobic skin benefit agents can include milk
triglycerides (e.g., hydroxylated milk glyceride) and polyol fatty
acid polyesters.
[0074] The benefit phase may also comprise a cationic hydrophobic
polyethylene polymer. The cationic hydrophobic polyethylene polymer
may be present from about 0.01% to about 5% by weight of the
personal care composition. The cationic hydrophobic polyethylene
polymer may be present from about 0.05% to about 2% by weight of
the personal care composition. As another example, the cationic
hydrophobic polyethylene polymer may be present from about 0.1% to
about 1.5% by weight of the personal care composition.
[0075] An example of a suitable cationic hydrophobic polyethylene
polymer includes an ethylene copolymer wherein the copolymer
contains amino monomer. The amino monomer is, for example, amino
acrylate. The polyethylene polymer can contain, for example, from
about 1 to about 50% amino monomer by weight of the cationic
hydrophobic polyethylene polymer. As another example, the
polyethylene polymer can contain from about 5 to about 49% amino
monomer by weight of the cationic hydrophobic polyethylene polymer.
As an additional example, the polyethylene polymer contains from
about 10 to about 48% amino monomer by weight of the cationic
hydrophobic polyethylene polymer. As another example, the
polyethylene polymer copolymer comprises poly(ethylene-co-DMAEMA).
In an additional example, the polyethylene copolymer comprises
dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate,
diethylaminoethyl acrylate,
(4-hydroxyl-2,2,6,6-tetra-methylpiperridine) methacrylate, 2-Tert
butyl amino ethyl methacrylate, or a combination thereof.
[0076] The cationic hydrophobic polyethylene polymer can have a
viscosity at 120.degree. C., for example, from about 50 to about
10,000 cps; from about 100 to about 8000 cps; or about 110 to about
5000 cps. The viscosity can be measured with a Dinamic Rotator
Viscometer RS 600.
C. OPTIONAL INGREDIENTS
[0077] Additional optional ingredients can also be added to the
personal care composition for treatment of the skin and/or hair, or
to modify the aesthetics of the personal care composition as is the
case with perfumes, colorants, dyes or the like. Optional materials
useful in products herein can be categorized or described by their
cosmetic and/or therapeutic benefit or their postulated mode of
action or function. However, it can be understood that actives and
other materials useful herein can, in some instances, provide more
than one cosmetic and/or therapeutic benefit or function or operate
via more than one mode of action. Therefore, classifications herein
can be made for convenience and cannot be intended to limit an
ingredient to particularly stated application or applications
listed. A precise nature of these optional materials, and levels of
incorporation thereof, will depend on the physical form of the
composition and the nature of the cleansing operation for which it
is to be used. Optional materials can usually be formulated at
about 6% or less, about 5% or less, about 4% or less, about 3% or
less, about 2% or less, about 1% or less, about 0.5% or less, about
0.25% or less, about 0.1% or less, about 0.01% or less, or about
0.005% or less of the rinse-off personal care composition.
[0078] To further improve stability under stressful conditions such
as high temperature and vibration, densities of separate phases can
be adjusted such that they can be substantially equal. To achieve
this, low density microspheres can be added to one or more phases
of the rinse-off personal care composition. Examples of rinse-off
personal care compositions that comprise low density microspheres
are described in a patent application published on May 13, 2004
under U.S. Patent Publication No. 2004/0092415A1 entitled "Striped
Liquid Personal Cleansing Compositions Containing A Cleansing Phase
and A Separate Phase with Improved Stability," filed on Oct. 31,
2003 by Focht, et al.
[0079] Other non-limiting optional ingredients that can be used in
the personal care composition of the present invention can comprise
an optional benefit component that can be selected from the group
consisting of thickening agents; preservatives; antimicrobials;
fragrances; chelators (e.g. such as those described in U.S. Pat.
No. 5,487,884 issued to Bisset, et al.); sequestrants; vitamins
(e.g. Retinol); vitamin derivatives (e.g. tocophenyl actetate,
niacinamide, panthenol); sunscreens; desquamation actives (e.g.
such as those described in U.S. Pat. Nos. 5,681,852 and 5,652,228
issued to Bisset); anti-wrinkle/anti-atrophy actives (e.g. N-acetyl
derivatives, thiols, hydroxyl acids, phenol); anti-oxidants (e.g.
ascorbic acid derivatives, tocophenol) skin soothing agents/skin
healing agents (e.g. panthenoic acid derivatives, aloe vera,
allantoin); skin lightening agents (e.g. kojic acid, arbutin,
ascorbic acid derivatives) skin tanning agents (e.g.
dihydroxyacteone); anti-acne medicaments; essential oils; sensates;
pigments; colorants; pearlescent agents; interference pigments (e.g
such as those disclosed in U.S. Pat. No. 6,395,691 issued to Liang
Sheng Tsaur, U.S. Pat. No. 6,645,511 issued to Aronson, et al.,
U.S. Pat. No. 6,759,376 issued to Zhang, et al, U.S. Pat. No.
6,780,826 issued to Zhang, et al.) particles (e.g. talc, kolin,
mica, smectite clay, cellulose powder, polysiloxane, silicas,
carbonates, titanium dioxide, polyethylene beads) hydrophobically
modified non-platelet particles (e.g. hydrophobically modified
titanium dioxide and other materials described in a commonly owned,
patent application published on Aug. 17, 2006 under Publication No.
2006/0182699A, entitled "Personal Care Compositions Containing
Hydrophobically Modified Non-platelet particle filed on Feb. 15,
2005 by Taylor, et al.) and mixtures thereof. The multiphase
personal care composition can comprise from about 0.1% to about 4%,
by weight of the rinse-off personal care composition, of
hydrophobically modified titanium dioxide. Other such suitable
examples of such skin actives are described in U.S. patent
application Ser. No. 13/157,665.
[0080] Other optional ingredients can be most typically those
materials approved for use in cosmetics and that are described in
the CTFA Cosmetic Ingredient Handbook, Second Edition, The
Cosmetic, Toiletries, and Fragrance Association, Inc. 1988,
1992.
D. EXEMPLARY COMBINATIONS
[0081] As one example, a personal care composition comprises a
cleansing phase comprising a water soluble cationic polymer and a
surfactant; and a benefit phase comprising a hydrophobic benefit
agent and a cationic hydrophobic polyethylene polymer.
[0082] As another example, a personal care composition comprises a
cleansing phase comprising an anionic surfactant and a water
soluble cationic polymer; and a benefit phase comprising a
hydrophobic benefit agent selected from the group consisting of
petrolatum, soy bean oil, sefose, and combinations thereof, and a
cationic hydrophobic polyethylene polymer.
[0083] In an additional example, a personal care composition
comprises a cleansing phase comprising an anionic surfactant, a
cosurfactant, a water soluble cationic polymer, an associative
polymer, and an electrolyte; and a benefit phase comprising a
benefit agent comprising an ethylene copolymer. In a further
example, the ethylene copolymer comprises
poly(ethylene-co-DMAEMA).
[0084] In another example, a personal care composition comprises a
cleansing phase comprising sodium tridecyl ether sulfate and guar
hydroxypropyltrimonium chloride; and a benefit phase comprising soy
bean oil and poly(ethylene-co-DMAEMA).
[0085] In the above exemplary combinations, the pH can range from
4.5 to about 9.
E. METHODS
[0086] In addition to the compositions above, inventive methods are
also present. For example, a method for increasing benefit agent
deposition to skin and/or hair in a personal cleansing composition
includes combining a surfactant, a water soluble cationic polymer,
a benefit agent, and a cationic hydrophobic polyethylene polymer to
form a person care composition. As an example, the surfactant and
water soluble cationic polymer are in a cleansing phase while the
benefit agent and cationic hydrophobic polyethylene polymer are in
a benefit phase. In a further example, the personal cleansing
composition is applied to skin of a user and rinsed off. As an
example, the cationic hydrophobic polyethylene polymer comprises
poly(ethylene-co-DMAEMA).
[0087] A method of increasing coacervate rheology comprising
combining a surfactant, a water soluble cationic polymer, a benefit
agent, and a cationic hydrophobic polyethylene polymer to form a
personal care composition and then diluting the personal care
composition with water. In one example, the surfactant and water
soluble cationic polymer are in a cleansing phase while the benefit
agent and cationic hydrophobic polyethylene polymer are in a
benefit phase. In a further example, the personal cleansing
composition is applied to skin of a user and rinsed off. In another
example, the cationic hydrophobic polyethylene polymer comprises
poly(ethylene-co-DMAEMA).
[0088] A method of increasing encapsulation of a benefit agent in a
coacervate comprising combining a surfactant, a water soluble
cationic polymer, a benefit agent, and a cationic hydrophobic
polyethylene polymer to form a personal care composition and then
diluting the personal care composition with water. In one example,
the surfactant and water soluble cationic polymer are in a
cleansing phase while the benefit agent and cationic hydrophobic
polyethylene polymer are in a benefit phase. In a further example,
the personal cleansing composition is applied to skin of a user and
rinsed off. In another example, the cationic hydrophobic
polyethylene polymer comprises poly(ethylene-co-DMAEMA).
[0089] For simplicity, only a minimal amount of compositional
ingredients and variants are discussed here. The above disclosure
relating to the compositions and ingredients are equally applicable
here as well.
F. EXAMPLE
Example 1
TABLE-US-00002 [0090] Comparative Rinse off Composition Ex. A Ex. B
Ex. C Ex. D Ex. E Cleansing phase, % Distilled Water Q.S. Q.S. Q.S.
Q.S. Q.S. Sodium Tridecyl Ether Sulfate 12.6 12.6 12.6 12.6 12.6
Laurylamidopropyl Betaine 7.67 7.67 7.67 7.67 7.67 Sodium Chloride
4.75 4.75 4.75 4.75 4.75 Iconol TDA3-Ethoxylated Tridecyl Alcohol
1.40 1.40 1.40 1.40 1.40 N-Hance CG17 Cationic Guar -- -- -- --
0.42 polyquaternium 76 (AM:Triquat 95:5) -- -- -- -- -- PAMMAPTAC
(AM:MAPTAC 88:12) -- -- -- -- -- Preservative 1 0.28 0.28 0.28 0.28
0.28 Preservative 2 0.037 0.037 0.037 0.037 0.037 Associative
Polymer 0.15 0.15 0.15 0.15 0.15 Sequestering agent 0.15 0.15 0.15
0.15 0.15 Oxidizer (50% solution) 0.07 0.07 0.07 0.07 0.07 Benefit
phase, % Hydrophobic benefit agent (soy bean oil) 10.0 9.0 9.0 9.0
10.0 Ethylene-DMAEMA copolymer (Polymer 6) -- 1.0 -- -- --
Ethylene-DMAEMA copolymer (Polymer 4) -- -- 1.0 -- --
Ethylene-DMAEMA copolymer (Polymer 1) -- -- -- 1.0 -- Product pH
5.37 7.79 7.49 7.85 5.54 In vitro Soybean oil deposition
(pg/cm.sup.2) 2.0 2.7 2.2 2.6 16 Inventive Rinse off Composition
Ex. F Ex. G Ex. H Ex. I Ex. J Cleansing phase, % Distilled Water
Q.S. Q.S. Q.S. Q.S. Q.S. Sodium Tridecyl Ether Sulfate 12.6 12.6
12.6 12.6 12.6 Laurylamidopropyl Betaine 7.67 7.67 7.67 7.67 7.67
Sodium Chloride 4.75 4.75 4.75 4.75 4.75 Iconol TDA3-Ethoxylated
Tridecyl Alcohol 1.40 1.40 1.40 1.40 1.40 N-Hance CG17 Cationic
Guar 0.42 0.42 0.42 -- -- polyquaternium 76 (AM:Triquat 95:5) -- --
-- 0.42 -- PAMMAPTAC (AM:MAPTAC 88:12) -- -- -- -- 0.42
Preservative 1 0.28 0.28 0.28 0.28 0.28 Preservative 2 0.037 0.037
0.037 0.037 0.037 Associative Polymer 0.15 0.15 0.15 0.15 0.15
Sequestering agent 0.15 0.15 0.15 0.15 0.15 Oxidizer (50% solution)
0.07 0.07 0.07 0.07 0.07 Benefit phase, % Hydrophobic benefit agent
(soy bean oil) 9.0 9.0 9.0 9.0 9.0 Ethylene-DMAEMA copolymer
(Polymer 6) 1.0 -- -- -- -- Ethylene-DMAEMA copolymer (Polymer 4)
-- 1.0 -- -- -- Ethylene-DMAEMA copolymer (Polymer 1) -- -- 1.0 1.0
1.0 Product pH 7.87 7.26 7.70 7.35 7.50 In vitro Soybean oil
deposition (pg/cm.sup.2) 55 177 392 66 379
[0091] The cleansing phase of both the inventive and comparative
formulations are prepared by adding water in a mixing vessel. Then
the following ingredients are added with continuously mixing:
sodium chloride, water soluble cationic polymer if applicable (e.g.
N-hance CG-17 cationic guar), laurylamidopropyl betaine, sodium
tridecyl sulfate, ethoxylated tridecyl alcohol, sequestering agent,
and associative polymer. The pH is then adjusted by adding oxidizer
(50% solution) as needed to attain a pH=5.7.+-.0.2. Then the
preservatives are added and the phase mixed until homogeneous.
[0092] The benefit phase, if only soy bean oil, is added to the
cleansing phase. The mixture is mixed at 2000 rpm for 1 minute on a
SpeedMixer.TM. (Model DAC, 400FV available from FleckTeck, Inc
USA). If the benefit phase comprises a hydrophobic cationic
polyethylene polymer (Polymer 6, 4, or 1) in addition to the
soybean oil, then the polymers are heated to a few degrees
(3-5.degree. C.) above their glass transition temperature (Tg) in
the soy bean oil prior to the addition of the benefit phase to the
cleansing phase. The two components are mixed with any standard
mixing techniques until the polymer is mixed into the soybean oil.
While warm the benefit phase is added to the cleansing phase
followed by speed mixing described above. To avoid the formation of
large chunks of the benefit phase in the cleansing phase, the
cleansing phase may be warmed to a similar temperature as the
benefit phase before mixing.
G. TEST PROTOCOL
[0093] Fastmice
[0094] In-Vitro Deposition Evaluation Method:
[0095] The In-vitro Deposition Evaluation Method measures the
deposition of benefit agents on a skin mimic. The method compares
the quantity of benefit agent of the skin mimic surface before and
after cleansing in an automated cleansing unit, such as the
automated cleansing unit described in co-pending and co-assigned
Multiphase Personal Care Composition With Enhanced Deposition, U.S.
application Ser. No. 12/510,880 (filed Jul. 28, 2009) and In-Vitro
Deposition Evaluation Method for Identifying Personal Care
Compositions Which Provide Improved Deposition of Benefit Agents,
U.S. application Ser. No. 12/511,034 (filed Jul. 28, 2009).
[0096] The In-vitro Deposition Evaluation Method uses two 12-well
plates (hereinafter referred to as "plates"). Suitable 12-well
plates are commercially available from Greiner bio-one. For
example, the Cellstar.RTM. 12 well suspension culture plate has 3
rows and 4 columns with a well volume of about 6.2 mL. The
Cellstar.RTM. 12 well suspension culture plate comprises the
approximate dimensions of 19 mm in height, 127 mm in length and 85
mm in width. The Cellstar.RTM. 12 well suspension culture plate has
a well diameter of 23 mm, a well depth of 15 and a well to well
spacing of 2 mm A Cellstar.RTM. 12 well suspension culture plate is
provided for containing the samples comprising the personal care
composition in the Examples above.
[0097] The In-vitro Deposition Evaluation Method uses approximately
120 g of bodies for two plates. Five grams of bodies carefully
loaded into each of the 12 wells of the two plates to ensure the
same quantity is loaded into each well. Each body is a spherical
stainless steel bearing that is approximately 2 mm in
circumference. Each body comprises ferrometallic material. Suitable
bodies are those available from WLB Antriebeselemente Gmbh,
Scarrastrasse 12, D-68307 Mannheim, Germany.
[0098] The personal care compositions are prepared according to the
description in the Example Section above. After the examples of the
personal care compositions are prepared, control and test samples
are prepared by determining the dilution ratio and dispensing both
the personal care composition and distilled water into the wells of
the microplate and allow the samples to mix while being exposed to
the automated washing process. The dilution ratio used in this
application is one part of composition and twenty nine parts of
water (1:29). A pre-calibrated positive displacement pipette is
used to dispense 66.7 .mu.L of composition on to the bodies in each
well, followed by dispensing 1933.3 .mu.L of distilled water into
each well. The control samples and test samples are dispensed in
the specified wells of the plate, all within a 20 minute time
frame. Each composition is placed in 6 different well, 3 of which
are in plate 1 and the other 3 well are in plate 2. A test control
composition containing the benefit agent should be used in every
test to ensure consistency among tests.
[0099] The skin mimic used in the In-vitro Deposition Evaluation
Method is comprised of a molded bicomponent polyurethane substrate.
The skin mimic is textured on one side with a pattern that
resembles the texture of human skin. The textured side of the skin
mimic is coated with 1,1,1-trimethyl-1-pentene that is plasma
deposited. The skin mimic surface has a total surface energy of
32.+-.1.0 (mJ/m.sup.2) and a contact angle in water of
100.degree..+-.2.0. Suitable skin mimic surface materials are
described in co-pending and co-assigned Coated Substrate with
Properties of Keratinous Tissue, U.S Patent Pub. No. 20070128255A1
(filed Aug. 11, 2006) (published Jun. 7, 2007) and Methods of Use
of Substrate Having Properties of Keratinous Tissue, U.S Patent
Pub. No. 20070288186A1 (filed Feb. 5, 2007) (published Dec. 13,
2007).
[0100] After all of the wells of the plate are filled with the
samples and the pieces of skin are made and coated, the skin mimic
is prepared for the In-vitro Deposition Evaluation Method. Two
pieces of skin mimic are prepared by cutting the skin mimic to fit
on top of all 12 openings of the wells of the plate while wearing
gloves. The two pieces of skin mimic pieces are numbered "1" and
"2".
[0101] Next, the pieces of skin mimics are arranged over the
openings of the wells of the microplates. The pieces of skin mimic
surface material are transferred to cover the openings of the wells
of the each of the plates to ensure that the textured and treated
region of the skin mimic is facing the openings of the wells of the
plate. A lid is placed over each piece of the skin mimic and the
associated plate to form a lidded plate.
[0102] The lidded plates are placed into plate holders of an
automated cleansing unit, or, a device used in the in-vitro
Deposition Evaluation Method of the present invention. The
automated cleansing unit comprises a horizontal base comprising
four microplate holders. The horizontal base is made of rectangle
of aluminum comprising the following approximate dimensions of 3/8
inch in height, fourteen inches in width and twenty seven inches in
length. The automated cleansing unit further comprises two vertical
supports comprised of aluminum with the approximate dimensions of
one inch by two inches by ten and 3/4 of an inch in height. The
vertical supports are attached to a horizontal support comprising a
rodless air slide. The horizontal support comprising a rodless air
slide comprises the approximately dimension of a 1/2 inch by two
inches by twenty six and 1/2 inches in height. Suitable rodless air
slides comprise a one inch bore and eleven inch stroke and have
associated end lugs and mount brackets, which are commercially
available from McMaster-Carr. The rodless air slide can be double
acting and comprises a carriage that is connected to an internal
piston and two compressed air ports.
[0103] The automated cleansing unit comprises two magnetic arms.
The horizontal support comprising a rodless air slide is the
structure upon which the two magnetic arms are mounted. The
magnetic arms are mounted to the rodless air slide such that the
magnetic arms move back and forth along the length of the double
acting rodless air slide by the force of compressed air. Each of
the magnetic arms are comprised of aluminum and have the
approximate dimensions of one inch by two inches by fourteen inches
in length and have a "T" shape channel that houses seven neodymium
iron boron magnets (not shown). Each of the neodymium iron boron
magnets has the approximate dimensions of two inches in length, one
inch in width and half or an inch in height. Each of the neodymium
iron boron magnets comprises a magnetic strength of 12200 Gauss,
available from Edmund Scientifics. The magnetic arms are configured
at a height of about 2.75 cm above the microplate holder with the
caveat that the magnets maintain their function to attract and move
the bodies comprised within the wells of the microplate. The
magnetic arms move back and forth along the length of the rodless
air slide by the force of compressed air at a speed of
approximately 6 back and forth sweeps over the length of the
rodless air slide over a 10 second time period.
[0104] The magnetic arms can be configured with four microplate
holders. Each of the microplate holders comprise a clamping plate
and four pistons attached to a pneumatic control unit. When
actuated, the pistons for the pneumatic control unit hold the
plates in the four plate holders at a pressure of about 90 psi.
Prior to placing the lidded plates into the plate holders of
automated cleansing unit, the pneumatic control unit is turned
on.
[0105] The automated cleansing unit can comprise a pneumatic
control unit. The top view shows components of the pneumatic
control unit which can be connected to the rodless air slide, the
piston and clamping plates. The pneumatic control unit can be used
to apply compressed air to the automated cleansing unit, which
imparts a force by converting the potential energy of compressed
air into kinetic energy. The pneumatic control unit comprises a
solenoid air control valve, a distribution manifold outlet, a
compressed air control valve, a compressed air flow regulator, an
alternating output binary valve, a two-hand safety pneumatic
control valve, a compressed air control valve and various
connectors that provide pressurized air to the automated cleansing
unit from an external air source. The air control valve, air flow
regulators, alternating a binary valves, a two-hand safety
pneumatic control valve are positioned upstream of a solenoid air
control valve. A suitable solenoid air control valve can be
described as a double air style valve with a 10 psi to 120
operating pressure. Suitable compressed air flow regulators can
operate, for example, in the pressure range of 14 psi to 116 psi.
Suitable air control valve alternating output binary valves 40 can
operate, for example, in a 35 psi to 100 psi range. All of the
components of the pneumatic control unit are available from
McMaster-Carr.RTM..
[0106] The lidded plates are placed into the plate holders and
pneumatic control unit is actuated such that the lidded plates are
held under 90 psi of pressure. The magnetic arms are actuated on
and arms moves over the lidded microplates at a height of 2.65 cm
above the plate holders. The magnetic arms of the automated
cleansing unit, sweep back and forth over the plate holders for 5
minutes, at a speed of 6 sweeps per every 10 seconds. After 5
minutes of the automated cleansing process, the lidded plates are
removed from the plate holders and are disassembled.
[0107] After the automated washing process, two large 4000 ml
beakers of 20.degree. C. to 25.degree. C. water are filled. The
first piece of skin mimic is removed from the first plate and
submerged in the tap water within the first beaker five times. The
second piece of skin mimic is removed from the second microplate
and submerged within the second beaker five times. The completeness
of rinsing step is judged visually by the lack of foam on the skin
mimic and presence of defined circles of deposited material on the
skin mimic. Both piece of skin mimic are blotted gently with paper
towels and fumed in a drying hood for at least 3 hours each.
[0108] The cut-out pieces of treated skin mimic are then extracted
with a solvent and the extract is analyzed and quantified by gas
chromatography.
[0109] The dimensions and values disclosed herein are not to be
understood as being strictly limited to the exact numerical values
recited. Instead, unless otherwise specified, each such dimension
is intended to mean both the recited value and a functionally
equivalent range surrounding that value. For example, a dimension
disclosed as "40 mm" is intended to mean "about 40 mm."
[0110] Every document cited herein, including any cross referenced
or related patent or application and any patent application or
patent to which this application claims priority or benefit
thereof, is hereby incorporated herein by reference in its entirety
unless expressly excluded or otherwise limited. The citation of any
document is not an admission that it is prior art with respect to
any invention disclosed or claimed herein or that it alone, or in
any combination with any other reference or references, teaches,
suggests or discloses any such invention. Further, to the extent
that any meaning or definition of a term in this document conflicts
with any meaning or definition of the same term in a document
incorporated by reference, the meaning or definition assigned to
that term in this document shall govern.
[0111] While particular embodiments of the present invention have
been illustrated and described, it would be obvious to those
skilled in the art that various other changes and modifications can
be made without departing from the spirit and scope of the
invention. It is therefore intended to cover in the appended claims
all such changes and modifications that are within the scope of
this invention.
* * * * *