U.S. patent number RE29,634 [Application Number 05/604,997] was granted by the patent office on 1978-05-16 for dentifrice containing visible agglomerated particles of polishing agents.
This patent grant is currently assigned to Colgate Palmolive Company. Invention is credited to Francis D. Roberts, John J. Steinke, III.
United States Patent |
RE29,634 |
Roberts , et al. |
May 16, 1978 |
Dentifrice containing visible agglomerated particles of polishing
agents
Abstract
Dentifrice containing visible, palpable and esthetically
pleasing substantially water-insoluble agglomerated particles of
polishing agents. The particles are reduced to smaller impalapable
size by mild mechanical action such as by toothbrushing. The
agglomerates include water-insoluble polishing agent such as
insoluble sodium metaphosphate or dicalcium phosphate and may also
contain a binding agent such as gum acacia, gelatin, starch,
carboxymethyl cellulose or the like.
Inventors: |
Roberts; Francis D. (West
Millington, NJ), Steinke, III; John J. (Fayetteville,
NY) |
Assignee: |
Colgate Palmolive Company (New
York, NY)
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Family
ID: |
25016206 |
Appl.
No.: |
05/604,997 |
Filed: |
August 15, 1975 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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224629 |
Feb 8, 1972 |
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Reissue of: |
750028 |
Aug 5, 1968 |
03574823 |
Apr 13, 1971 |
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Current U.S.
Class: |
424/57; 424/49;
424/52; 424/54 |
Current CPC
Class: |
A61K
8/0275 (20130101); A61K 8/042 (20130101); A61Q
11/00 (20130101); A61K 2800/262 (20130101) |
Current International
Class: |
A61K 007/18 ();
A61K 007/22 () |
Field of
Search: |
;424/48-58
;51/293-309 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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1,381,416 |
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Nov 1964 |
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FR |
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954,281 |
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Dec 1949 |
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FR |
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Other References
Ronchi, "Optics-The Science of Vision" (1957), N.Y.U. Press, N.Y.,
N.Y., pp. 248-251, 254-255, 280-283. .
Hartridge, "Recent Advances in the Physiology of Vision" (1950),
Churchill, London, pp. 12-21, 106-127. .
Luckiesh et al., "Seeing-A Partnership of Lighting and Vision"
(1931), Williams & Wilkins, Baltimore, Md., pp. 24-57, 68-71,
84-85, Suppl. 1-5..
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Primary Examiner: Rose; Shep K.
Attorney, Agent or Firm: Sheffer; Abner
Parent Case Text
This is a continuation of application Ser. No. 224,629 filed Feb.
8, 1972, now abandoned. .Iaddend.
Claims
We claim:
1. A .Iadd.transparent .Iaddend.toothpaste comprising (I) a dental
vehicle comprising water, a humectant and a gelling agent and (II)
about 5-75% by weight of said .Iadd.transparent .Iaddend.toothpaste
of visible, palpable particles of substantially water-insoluble
agglomerated material consisting essentially of material selected
from the group consisting of (a) water-insoluble dental polishing
agent; (b) mixtures of about 75-98% by weight of water-insoluble
dental polishing agent with (b-1) water-soluble binding agent,
(b-2) water-soluble binding agent and a lubricant, (b-3)
water-soluble binding agent and a non-abrasive diluent, and (b-4)
water-soluble binding agent, a lubricant and a non-abrasive
diluent; and (c) mixture of about 99% by weight of water-insoluble
dental polishing agent with a lubricant.
2. The toothpaste claimed in claim 1 wherein said particles of
agglomerated material have particle sizes between 420 microns and
840 microns.
3. The toothpaste claimed in claim 1 wherein said water-insoluble
polishing agent is dicalcium phosphate.
4. The toothpaste claimed in claim 1 wherein said .[.toothpaste is
transparent and said.]. dental vehicle has a liquid content of
water and humectant of about 20-89.5% by weight of said
toothpaste.
5. The toothpaste claimed in claim 4 wherein said dental vehicle
contains as humectant sorbitol and as gelling agent sodium
carboxymethyl cellulose.
6. The toothpaste claimed in claim 1 wherein said substantially
water-insoluble agglomerated material consists essentially of a
mixture of about 75-98% by weight of water-insoluble dental
polishing agent with
water-soluble binding agent,
water-soluble binding agent and a lubricant,
water-soluble binding agent and a non-abrasive diluent, or
water-soluble binding agent, a lubricant and non-abrasive
diluent.
7. The toothpaste claimed in claim 6 wherein said water-insoluble
dental polishing agent is calcium carbonate.
8. The toothpaste claimed in claim 6 wherein said water-insoluble
dental polishing agent is hydrated alumina.
9. The toothpaste claimed in claim 6 wherein said water-soluble
binding agent is gum acacia.
10. The toothpaste claimed in claim 6 wherein said water-soluble
binding agent is polyvinyl pyrrolidone.
11. The toothpaste claimed in claim 6 wherein said water-soluble
binding agent is polyethylene glycol.
12. The toothpaste claimed in claim 11 wherein said substantially
water-insoluble agglomerated material consists essentially of a
mixture of about 75-98% by weight of water-insoluble dental
polishing agent with
water-soluble polyethylene glycol binding, agent and a lubricant or
with
water-soluble polyethylene glycol binding agent, a lubricant and a
non-abrasive diluent.
13. The toothpaste claimed in claim 6 wherein said water-insoluble
dental polishing agent comprises an insoluble phosphate salt.
14. The toothpaste claimed in claim 13 wherein said insoluble
phosphate salt is insoluble sodium metaphosphate.
15. The toothpaste claimed in claim 13 wherein said insoluble
phosphate salt is dicalcium phosphate. .Iadd.
16. A speckled transparent toothpaste comprising (I) a transparent
dental vehicle including water, humectant and a gelling agent, and,
blended therewith and dispersed therein, (II) individually visible
palpable particles of substantially water-insoluble agglomerated
material consisting essentially of individually invisible
impalpable water-insoluble agglomerated powder particles of dental
polishing agent, said powder particles being so agglomerated that
said visible palpable particles retain their visibility and
palpability in the toothpaste but are mechanically reduced to
impalpability when the toothpaste is rubbed on the teeth during
brushing with a toothbrush, the maximum amount of said palpable
particles being about 75 percent by weight and the amount of said
palpable particles being such that said toothpaste when viewed with
the naked eye has the visual effect of having said palpable
particles distributed therein, the content of dental polishing
agent in said toothpaste being sufficient to provide a dental
polishing action on use of said toothpaste, said toothpaste when
viewed with the naked eye having the visual effect of being
speckled by virtue of having said palpable particles distributed in
said transparent vehicle. .Iaddend. .Iadd.
17. Toothpaste as in claim 16 wherein said visible palpable
particles are of a size to pass through a screen having uniform
openings of 840 microns. .Iaddend. .Iadd.18. Toothpaste as in claim
16 wherein said agglomerated material further includes an
agglomerating agent which is a binding agent or lubricant.
.Iaddend. .Iadd.19. Toothpaste as in claim 18 wherein said
agglomerated material further includes a non-abrasive diluent.
.Iaddend. .Iadd.20. Toothpaste as in claim 16 wherein said
agglomerated material further includes up to 10 percent by weight
of a color dye or pigment. .Iaddend. .Iadd.21. Toothpaste as in
claim 16 wherein said water-insoluble polishing agent constitutes
the major portion of said agglomerated material. .Iaddend.
.Iadd.22. Toothpaste as in claim 17 containing water-insoluble
invisible polishing agent of particle size less than about 74
microns to increase polishing power beyond that provided by
said
agglomerated powder. .Iadd.23. Toothpaste as in claim 17 in which
said visible palpable particles contain agglomerated powder
particles of zirconium silicate polishing agent. .Iaddend.
.Iadd.24. Toothpaste as in claim 23 in which water-insoluble
polishing agent constitutes the major portion of said agglomerated
material. .Iaddend. .Iadd.25. Toothpaste as in claim 18 in which
the agglomerating agent comprises polyethylene glycol 6000.
.Iaddend. .Iadd.26. Toothpaste as in claim 18 in which the
agglomerating agent comprises steric acid. .Iaddend. .Iadd.27. A
toothpaste as in claim 16 in which the amount of said palpable
particles is up to about 50% by weight of sadi toothpaste and said
visible palpable particles are of a size to pass through a screen
having uniform openings of 840 microns. .Iaddend. .Iadd.28. A
toothpaste as in claim 16 wherein said water-insoluble polishing
agent constitutes the major portion of said agglomerated material,
said toothpaste containing water-insoluble invisible polishing
agent of particle size less than about 74 microns to increase
polishing power beyond that provided by said agglomerated
powder.
.Iaddend. .Iadd.29. A transparent toothpaste comprising (I) a
transparent dental vehicle including water, humectant and a gelling
agent and, blended therewith and dispersed therein, (II)
individually visible palpable particles of substantially
water-insoluble agglomerated material consisting essentially of
individually invisible, impalpable water-insoluble agglomerated
powder particles of dental polishing agent, said powder particles
being so agglomerated that said visible palable particles retain
their visibility and palpability in the toothpaste but are
mechanically reduced to impalpability when the toothpaste is rubbed
on the teeth during brushing with a toothbrush, the amount of said
palpable particles being such that said toothpaste when viewed with
the naked eye has the visual effect of having all said palpable
particles visibly distributed in said transparent vehicle, the
content of dental polishing agent in said toothpaste being
sufficient to provide a dental polishing action on use of said
toothpaste, the amount of said water and humectant in said
toothpaste being about 20 to 89.5% by weight of said
toothpaste.
.Iaddend. .Iadd.30. A toothpaste as in claim 29 wherein said
water-insoluble polishing agent constitutes the major portion of
said agglomerated material, said toothpaste contains
water-insoluble invisible polishing agent of particle size less
than about 74 microns to increase polishing power beyond that
provided by said agglomerated powder, said dental vehicle is
transparent and said toothpaste when viewed with the naked eye has
the visual effect of being speckled by virtue of having said
palpable particles distributed therein, the amount of said palpable
particles being up to about 50% by weight of said toothpaste.
.Iaddend.
.Iadd.31. A toothpaste as in claim 16 in which said palpable
particles are products prepared by a process in which pre-existing
dry impalpable dental polishing agent powder articles are
agglomerated together. .Iaddend. .Iadd.32. A toothpaste as in claim
31 in which said process comprises mixing said impalpable powder
particles with an agglomerating agent which is a binding agent or
lubricant. .Iaddend. .Iadd.33. A toothpaste as in claim 32 in which
said agglomerating agent is a water-soluble binding agent.
.Iaddend. .Iadd.34. Toothpaste as in claim 32 in which said
agglomerating agent is a lubricant. .Iaddend. .Iadd.35. Toothpaste
as in claim 32 in which said process comprises mixing said powder
particles with said agglomerating agent to form a mass larger than
said palpable particles and then subdividing said mass into said
palpable
particles. .Iaddend. .Iadd.36. A toothpaste comprising (I) a dental
vehicle including water, humectant and a gelling agent, and,
blended therewith and dispersed therein, (II) individually visible
palpable particles of substantially water-insoluble agglomerated
material consisting essentially of individually invisible,
impalpable water-insoluble agglomerated powder particles of dental
polishing agent, said powder particles being so agglomerated that
said visible palpable particles retain their visibility and
palpability in the toothpaste but are mechanically reduced to
impalpability when the toothpaste is rubbed on the teeth during
brushing with a toothbrush, the maximum amount of said palpable
particles being about 75 percent by weight and the amount of said
palpable particles being such that said toothpaste when viewed with
the naked eye has the visual effect of having said palpable
particles distributed therein, the content of dental polishing
agent in said toothpaste being sufficient to provide a dental
polishing action on use of said toothpaste, said impalpable powder
particles being particles less than 10 microns in diameter and said
dental vehicle being transparent or translucent so that all said
agglomerated particles are visible to the naked eye. .Iaddend.
Description
This invention relates to novel dentifrice preparations containing
visible, palpable and esthetically pleasing substantially
water-insoluble agglomerated particles of polishing agent.
Dentifrices of the prior art commonly contain water-insoluble
polishing agents which facilitate cleansing of the teeth. Since
these agents are water-insoluble, they have been used in small
particle sizes, substantially all of which are typically less than
177 microns in size and often even less than 10 microns. Such small
sized particles help to avoid too much abrasiveness, palpability
and retention of particles in the oral cavity even after rinsing
which would be expected if larger particles of water-insoluble
invisible, agent were employed. However, these small particles,
being individually invisible, could not contribute to the esthetic
appearance of the dentifrice.
It has now been found that dentifrice containing agglomerates of
water-insoluble polishing agent of desirable polishing power can be
prepared in a size visible to the naked eye which agglomerates are
substantially water-insoluble and palpable, have desirable
abrasiveness and are easily reduced to fine particle size upon
being subjected to mild mechanical action, such as toothbrushing,
so that the reduced size particles are easily cleared from the oral
cavity. The agglomerates, being visible, contribute markedly to the
visual and esthetic appeal of a dentifrice composition.
.Iadd.The art-accepted limit of resolution of the human eye is
about 100 micron. Thus the 1954 Edition, Guinness Book of World
Records states:
"Smallest Visible Object
The resolving power of the human eye is... 1/60th of a
degree..which corresponds to 100 microns at 10 inches..."
The book "Optics" by F.W. Sears of Massachusetts Institute of
Technology, printed 1958, Addison-Wesley Publishing Co., at page
260 discusses "Limit of Resolution of the eye" and says that the
distance (z) between "two just resolvable object points at the
minimum distance of distinct vision... is about 1/10 mm"; 1/10 mm
is 100 microns. And Civardi et al. U.S. Pat. No. 3,763,301
originally filed Dec. 9, 1968, at column 4 lines 57-62, states:
"The microporous materials... have pores invisible to the naked eye
of a person with 20/20 vision. Such pores measure less than 100
microns in their maximum dimension (when a plane surface, such as
the top or bottom of the material or a cross-section thereof is
observed).
As mentioned above, it has been common in the toothpaste art to
employ, as abrasives, impalpable particles of particle size well
below 100 microns. For instance, Wood U.S. Pat. 3,325,368 of June
13, 1967 refers to the use of polishing agents of submicron size
and says:
"In order to remove the plaque it is normal practice to use larger
particles, having an average particle size usually between 5 and 20
microns".
Muhler U.S. Pat. No. 3,450,813 states (at column 6, lines
67-79):
"particles greater than 50 microns are gritty to the teeth and
tongue and unsuitable for use in dentifrice compositions".
Toothpastes have also been made with agglomerates, aggregates or
granulates of abrasive particles, such agglomerates, aggregates or
granulates being of a size below the 100 micron limit of normal
visibility. For instance the previously cited Wood patent describes
"carrier particles" having "an average size in the range 1 to 50
microns, preferably 5 to 20 microns" having embedded therein
abrasive particles having an average size of less than 1 micron,
and Cooley et al. U.S. Pat. No. 3,151,027 describes toothpastes
containing particles of hard mineral substances coated with a
resin, states that "By particle is meant agglomerates as well as
individual particles" (column 4, lines 65-66), and says that
"The coated particles should have a mean particle diameter in the
range of about 2 microns to about 20 microns".
Broge U.S. Pat. No. 3,003,919 describes toothpastes containing
alumina abrasives which are "porous agglomerates having structural
rigidity" (column 5 lines 72-73); here again their size is well
below the visible limit, 20 microns being the largest size
mentioned (column 5 lines 52-67). .Iaddend.
It is an object of this invention to provide dentifrice
preparations containing agglomerated particles of water-insoluble
dental polishing agent which are easily reduced to fine size by
mild mechanical action.
Other objects of the invention will be apparent from consideration
of the following detailed description and claims.
In accordance with certain of the aspects, this invention relates
to dentifrice comprising a dental vehicle and an agglomerated
material containing water-insoluble polishing agent, particles of
said agglomerated material being visible, said agglomerated
material being palpable and substantially water-insoluble, and
easily reducible to individual particles of polishing agent, each
of which is pg,6 fine, non-visible and non-palpable upon being
subjected to mild mechanical action.
The agglomerated particles of polishing agent employed in the
instant invention are present on the surface of and within a
dentifrice. When the dentifrice is a transparent or translucent
toothpaste, all agglomerated particles are visible to the naked
eye. When it is opaque, the particles on the surface are visible.
The particles are visibly distributed throughout a toothpowder
also.
Translucent and transparent toothpastes as well as opaque
toothpastes contain a dental vehicle which forms a gel or creamy
mass of a consistency which can be desirably extruded from a
collapsible tube such as an aluminum tube or a lead tube. The
vehicle contains liquids and solids. In general, the liquid portion
comprises water, glycerine, sorbitol, propylene glycol,
polyethylene glycol 400 or the like including suitable mixtures
thereof. It is usually advantageous to use a mixture of both water
and a humectant, such as glycerine, sorbitol, propylene glycol or
the like. The total liquid content is generally about 20-89.5% by
weight of the toothpaste. In transparent and translucent
toothpastes the liquid content of the toothpaste may be about
20-89.5% by weight while in opaque toothpastes the total liquid
content is usually about 20-50%.
The solid portion of the vehicle is a gelling agent, such as the
natural and synthetic gums and gum-like materials, such as Irish
Moss, gum tragacanth, alkali metal carboxymethyl cellulose and
hydroxymethyl carboxyethyl cellulose, polyvinyl pyrrolidone,
starch, water soluble, hydrophilic colloidal carboxyvinyl polymers,
such as those sold under the trademark Carbopol 934 and 940. The
solid portion of the vehicle is typically present in an amount up
to about 10% by weight of the toothpaste and preferably about
0.5-5% by weight.
The substantially water-insoluble agglomerated particles on the
surface of and within the dentifrice contain a water-insoluble
polishing agent and, in accordance with preferred embodiments of
the invention, a binding agent.
Water-insoluble polishing agents of the prior art may be
agglomerated in accordance with this invention. The polishing
agents thus include insoluble phosphate salts, such as insoluble
sodium metaphosphate, insoluble potassium metaphosphate, calcium
pyrophosphate, magnesium orthophosphate, trimagnesium
orthophosphate, tricalcium phosphate, dicalcium phosphate
dihydrate, anhydrous dicalcium phosphate and the like. Other
polishing agents include calcium carbonate, magnesium carbonate,
hydrated alumina, silica, zirconium silicate, aluminum silicate
including calcined aluminium silicate and polymethyl methacrylate.
Combinations of polishing agents may be employed. The preferred
polishing agents are the dicalcium phosphates and insoluble sodium
metaphosphate.
The insoluble alkali metal metaphosphates are preferably the
insoluble sodium and potassium salts of polymetaphosphoric acid.
These materials are known in the art with the insoluble sodium
metaphosphate having been suggested as a polishing agent as
previously indicated. Such materials may be formed in any suitable
manner, as illustrated by Thrope's Dictionary of Applied Chemistry,
vol. 9 (4th ed.), pp. 510-511. The forms of insoluble sodium
metaphosphate known as Madrell's salt and Kurrol's salt are further
examples of suitable materials. These metaphosphate salts exhibit
only a minute solubility in water, and are commonly referred to as
insoluble metaphosphates, phosphates, therefore. There is present a
minor amount of soluble phosphate material as impurities, usually
of the order of a few percent such as up to about 4% by weight. The
amount of soluble phosphate material which is believed to be a
soluble sodium trimetaphosphate in the case of insoluble sodium
metaphosphate may be reduced by washing with water if desired.
Binding agents which may be employed to assist formation of
polishing agent into agglomerated particles include water-soluble
materials such as gum acacia (arabic), geiatins, starches, alkali
metal carboxymethyl cellulose, polyethylene glycols, glucose,
sucrose, methyl cellulose, carboxyethyl hydroxymethyl celluloses,
sodium alginate, polyvinyl pyrrolidone, polyvinyl alcohol, Irish
Moss, gum tragacanth, magnesium aluminum silicate gel and the like.
Mixtures of binding agents may be employed too. When the polishing
agents are freed from binding with these agents upon application of
mild pressure, typically a toothbrush applied in the oral cavity,
these water-soluble agents are easily solubilized in saliva.
Typically, the polishing agent comprises about 75% - 100% by
weight, preferably about 75%-98%, of the finished agglomerate. The
binding agent when present preferably comprises about 2%-25% by
weight of the finished agglomerate.
When employed the binding agent is blended with the polishing
agent. The binding agent may be blended in dry powdered form of in
solution in water or alcohol. The agglomerate may be formed in a
dry process known as "slugging" or in a wet granulation
process.
In the dry process or slugging process, the blend of polishing
agent particles, substantially all of which typically have an
individual particle size of less than 250 microns, and optionally
binding agent, are compressed on a tablet press. The large tablet
thereby formed typically has dimensions of about 6 mm. to 25 mm,
although it may be even larger. The tablet is then broken into
visible granule agglomerates having particles sizes, preferably up
to about 2380 microns, most preferably about 420-840 microns,
typically in a mill, granulator or comminutor.
When the dry or slugging process is employed, the blend to be
agglomerated preferably also includes a lubricant such as talc,
magnesium stearate, calcium stearate, stearic acid and the like.
The lubricant facilitates agglomeration.
When dry powdered binder is blended with polishing agent in the wet
granulation process, solvent, such as water or ethanol or a
solution of additional binding agent, is contacted with the blend
in sufficient amount to wet the mass.
The wet granulation process may be performed by wetting a powder
blend of water-insoluble dental polishing agent particles typically
having a particle size of less than 74 microns and binding agent in
continuous contact on a Dravo pan, in a Hobart mixer or other
suitable powder-wetting mixing device thereby forming a wet mass.
The "wetting" may be performed by contact of the polishing agent
with solid binder followed by moistening or with a solution of the
binder.
The wet mass formed from the polishing agent and palpable agent is
forced through a screen having uniform openings which may be from
420 microns to 2380 microns in size and dried as agglomerates.
Typically in air or an oven. The agglomerates may then be
segregated into desired sizes such as between 420 and 840 microns
by passing through appropriately sized screens. It is noted that
when the wet mass is formed in a Dravo pan, the forced screening
may be unnecessary.
It is desirable that the agglomerate formed be easily introduced
into the oral cavity in a dentifrice, such as a toothpaste, and
comfortably maintained there until reduced in size during
toothbrushing. Therefore, visible particles, generally having a
particle size larger than about 2380 microns, are preferably
separated from the agglomerates. In order to maximize the esthetic
appearance of the agglomerates when they are incorporated into a
dentifrice, it is desirable also to separate fines having a
particle size smaller than about 420 microns. However, any
agglomerates containing the components of the invention which are
visible to the naked eye are within the scope of the invention.
If desired, the blend to be agglomerated, by wet or dry procedures,
may also contain a non-abrasive diluent or filler, such as lactose,
starch, mannitol, and the like, in amounts of about 1%-5% by weight
of the agglomerate, in order to amelorate the polishing power of
the agglomerate. Furthermore, the blend may include ancillary
comonents, such as a color dye or pigment, particularly for an
opaque toothpaste or a toothpowder. Typical dyes and pigments
include F, D&C dyes and lakes and the like. Color material when
employed, generally is present in amounts of 1-10%.
Due to the nature of the water-insoluble polishing agent which
comprises the major proportion of the agglomerate, the agglomerate
is characterized as being substantially water-insoluble. In the
oral cavity it is quickly reduced in size from the visible,
palpable aggiomerates introduced into individual invisible, fine,
non-palpable particles upon subjection to mild mechanical action,
such as by rubbing on the teeth, gums or other portions of the oral
cavity with a toothbrush, the tongue, a finger or the like.
The agglomerated particles are generally incorporated into a
toothpaste in amount about 5-75% by weight of the dentifrice,
preferably 10-75%. Typically, they comprise up to about 50% by
weight of a transparent or translucent toothpaste.
In addition to the vehicle and agglomerates, the dentifrice may
contain water-insoluble invisible polishing agent having a particle
size typical of that employed in the prior art, such as less than
about 74 microns, if it is desired to increase polishing power
beyond that provided by the agglomerates.
The dentifrice may also contain surface-active agent. It is
preferred that the total amount of surface-active agent be about
0.05-5% by weight, preferably about 1-3%, of the dentifrice.
Surface-active agent may include water-soluble sulfates of
compounds having long chain alkyl radicals (e.g. chains of 10 to 18
carbon atoms) are suitable. One preferred material is a long chain
fatty acid monoglyceride sulfate, such as the sodium salt of
hydrogenated coco fatty acid monoglyceride sulfate used along or in
combination with sodium lauryl sulfate. Other suitable materials
are the fatty acid amides of amino acids such as sodium N-lauroyl
sarosinate.
Various other materials, may be incorporated in the oral
preparation of this invention. Examples thereof are coloring or
whitening agents, preservatives, silicones, chlorophyll compounds,
ammoniated materials, such as urea, diammoniumphosphate and
mixtures thereof, and other constituents. Each of these adjuvants
may be typically incorporated in the instant toothpastes in amounts
up to about 5%. Where coloring is employed, the agglomerates may be
colored with a suitable contrasting color.
The toothpaste may also contain antibacterial agents in amounts of
about 0.01-5%. Typical examples of such agents are guanidines,
biguanides and amines such as:
N.sup.1 (4-chlorobenzyl)-N.sup.5 -2,4-dichlorobenzylbiguanide;
p-Chlorophenyl biguanide;
4-chlorobenzhydryl biguanide;
4-chlorobenzhydryl
N-3-lauroxypropyl-N.sup.5 -p-chlorobenzylbiguanide;
1,6-di-p-chlorophenylbiguanidohexane:
1-(lauryldimethylammonium)-8-(p-chlorobenzyldimethylammonium)
octane dichloride;
5,6-dichloro-2-guanidinobenzimidazole;
N.sup.1 -p-chlorophenyl-N.sup.5 -laurylbiguanide;
N.sup.5
-amino-1,3-bis(2-ethylhexyl)-5-methylhexahydro-pyrimidine;
and their non-toxic acid addition salts.
Suitable flavoring or sweetening sialagogues may be employed in
formulating a flavor for the compositions of the present invention.
Examples of suitable flavoring constituents include the flavoring
oils, e.g., oils of spearmint, peppermint, wintergreen, sassafras,
clove, sage, eucalyptus, marjoram, cinnamon, lemon and orange, as
well as sodium methylsalicylate. Suitable sweetening agents include
sucrose, lactose, maltose, sorbitol, sodium cyclamate and
saccharine. Suitably, flavor and sweetening agent may together
comprise from about 0.01 to 5% or more of the compositions of the
instant invention.
The compositions of the present invention suitably may also contain
a fluorine-containing compound having a beneficial effect on the
care and hygiene of the oral cavity, e.g., diminution of enamel
solubility in acid and protection of the teeth against decay.
Examples thereof include spodium fluoride, stannous fluoride,
potassium fluoride, potassium stannous fluoride (SnF.sub.2 .sup..
KF), sodium hexafluorostannate, stannous chlorofluoride, sodium
fluorozirconate and sodium monofluorophosphate. These materials,
which dissociate or release fluorine-containing ions in water,
suitably may be present in an effective but nontoxic amount,
usually within the range of about 0.01 to 1% by weight of the water
soluble fluorine content thereof.
The toothpaste of the invention is formed by preparing a toothpaste
containing no agglomerates and separately preparing the
agglomerates in accordance with procedure set forth above. Thus, a
gelling agent such as sodium carboxymethyl cellulose or Carbopol
934 and a preservative such as sodium benzoate, if employed, is
dispersed with a humectant such as glycerine. Water may also be
present. Additional humectant and water, as a 70% sorbitol
solution, may then be mixed with the dispersion and heat is applied
at about 40-60.degree. C., say 50.degree. C. to form a paste, gel
or cream. Surface-active agent, such as sodium lauryl sulfate, if
employed, is then dispersed in the mixture. The preparation is then
deaerated and cooled. Desired flavor may then be added and the
paste again deaerated.
The agglomerates are then dispersed in the toothpaste with minimal
mechanical agitation, insufficient to substantially break them
down. The toothpaste, including the esthetically pleasing
substantially water-insoluble agglomerated particles of polishing
agent, is then deaerated and tubed.
The following specific examples are further illustrative of the
nature of the present invention, but it is understood that the
invention is not limited thereto. The amounts and proportions of
compositions described in the examples are by weight unless
otherwise specified.
EXAMPLE I
220 parts of dicalcium phosphate dihydrate having an average
particle size of about 4.2 microns are moistened with 91 parts of a
10% aqueous solution of gum acacia while blending the components in
a Hobart mixer to uniformly wet the blend. The wet mass thereby
formed is forced through a screen having uniform openings of 2380
microns and oven dried for 1 hour at 65.degree. C. The dried
agglomerates are then screened through a screen having uniform
openings of 840 microns onto a screen having uniform openings of
420 microns. 132 parts of agglomerated dicalcium phosphate
dihydrate are retained on the screen having uniform openings of 420
microns. 132 parts of agglomerated dicalcium phosphate dihydrate
are retained on the screen having uniform openings of 840 microns
and 37 parts pass through to the screen having uniform openings of
420 microns.
20 parts of the agglomerate particles which pass through the screen
having uniform openings of 840 microns and which are retained on
the screen having uniform openings of 420 microns are blended with
80 parts of a translucent toothpaste having the following
formulation:
______________________________________ Percent
______________________________________ Water 81.00 Methyl
parahydroxybenzoale 0.15 Propyl parahydroxybenzoate 0.15 Sodium
saccharin 0.20 Clycerin 10.00 Carbopol 940 2.00 Sodium lauryl
sulfate 1.50 Sodium hydroxide solution (10%) 5.00
______________________________________
Similar dentifrices may be formed using aggregates formed by
blending with a 10 % gum acacia solution; hydrated alumina having
an average particle size less than about 2.5 microns; calcium
carbonate having particles substantially all of which are less than
about 7.4 microns in size; anhydrous dicalcium phosphate having
particles substantially all of which are less than about 7.4
microns in size; and insoluble sodium metaphospate having an
average particle size of about 4.8 microns.
The toothpastes described in this example are translucent and
esthetically pleasing. There are dispersed in the toothpaste
visible particles of the agglomerate polishing agents. During tooth
brushing the agglomerated particles are at first palpable and are
then easily reduced to individual particles of polishing agent of
fine size upon application of mild pressure with the
toothbrush.
EXAMPLE II
6000 parts of anhydrous dicalcium phosphate particles having sizes
indicated in Example I are blended with 150 parts of gum arabic
powder and 50 parts of gum tragacanth. The blend is then moistened
with a 10 % aqueous solution of gum arabic. The agglomerates are
then formed and screened in the manner set forth in Example I.
20 parts of the agglomerate particles described above are blended
with 80 parts of a transparent toothpaste having the following
formulation.
______________________________________ Percent
______________________________________ Glycerine 10.00 Sodium
carboxymethyl cellulose 2.00 Sodium benzoate 0.50 Sodium saccharin
0.20 Sodium lauryl sulfate 2.50 Color 0.10 Ethanol (95%) 10.00
Flavor 1.30 Sorbitol solution (70%) 73.40
______________________________________
Similar dentifrices may be formed using aggregates in which the
anhydrous dicalcium phosphate, gum arabic powder and gum tragacanth
are moistened with (A) a 20% solution of gum arabic, (B) a 10%
solution of polyvinyl pyrrolidone, (C) water, (D) ethanol or (E)
glucose solution.
The toothpastes described in this example are translucent and
esthetically pleasing. There are dispersed in the toothpastes
visible particles of the agglomerate polishing agents. During
toothbrushing the agglomerated particles are at first palpable and
are then easily reduced to individual particles of polishing agent
of fine size upon application of mild pressure with the
toothbrush.
EXAMPLE III
Agglomerates indicated below are made by blending polishing agent,
binder and lubricant to form a powder blend. The powder blend is
compressed in a rotary tablet press to form slugs about 6 mm.
.times. 25 mm. in size. The slugs are then granulated in an
oscillating granulator to form smaller particles. These particles
are screened with screens having uniformly spaced openings of 840
microns and 420 microns. 116 parts have particle sizes greater than
840 microns and 266 parts have particle sizes between 420 microns
and 840 microns. The remaining agglomerates are finer than 420
microns.
Agglomerates are made by slugging blends of the following
components:
__________________________________________________________________________
Parts (A) (B) (C) (D) (E) (F) (G) (H) (I) (J)
__________________________________________________________________________
Polishing agent: Dicalcium phosphate dihydrate 890 910 Calcium
carbonate 440 865 Insoluble sodium meta- phosphate 450 845 865 900
Hydrated alumina 500 790 500 Binder: Polyethylene glycol 6000 100
100 100 200 100 100 100 130 100 100 Lubricant: Magnesium stearate
10 10 10 10 10 10 Talc 35 35 35 Stearic acid 5
__________________________________________________________________________
20 parts of each of the agglomerate particles described above are
blended with 80 parts of a transparent toothpaste having the
following formulation:
______________________________________ Percent
______________________________________ Glycerine 10.00 Sorbitol
solution (70%) 75.10 Sodium benzoate 0.50 Sodium carboxymethyl
cellulose 2.00 Sodium lauryl sulfate 1.50 Flavor 0.80 Ethanol (95%)
10.00 Color 0.10 ______________________________________
The toothpastes described in this example are translucent and
esthetically pleasing. There are dispersed in the toothpastes
visible particles of the agglomerate polishing agents. During
toothbrushing the agglomerated particles are at first palpable and
are then easily reduced to individual particles of polishing agent
of fine size upon application of mild pressure with the
toothbrush.
EXAMPLE IV
99 parts of unmilled dicalcium phosphate dihydrate having an
average particle size of about 118.+-.33 microns are blended with 1
part of magnesium stearate lubricant. The powder blend is
compressed on a rotary tablet press to form agglomerate slugs 6 mm.
.times. 25 mm. in size. The slugs are then granulated in an
oscillating granulator to form smaller agglomerate particles. These
particles are screened with screens having uniformly spaced
openings of 840 microns and 420 microns. 20 parts of the
agglomerate particles which pass through the screen having uniform
openings of 840 microns and which are retained on the screen having
uniform openings pf 420 microns are blended with 80 parts of a
translucent toothpaste having the following formulation:
______________________________________ Percent
______________________________________ Glycerin 10.000 Sorbitol
(70%) 74.075 Sodium carboxymethyl cellulose 2.000 Sodium benzoate
0.500 Sodium saccharin 0.200 Color 0.100 Sodium lauryl sulfate
1.500 Ethanol (95%) 10.000 Flavor 1.625
______________________________________
The toothpaste described in this example is translucent and
esthetically pleasing. There are dispersed in the toothpaste
visible particles of the agglomerate polishing agents. During
toothbrushing the agglomerated particles are at first palpable and
are then easily reduced to individual particles of polishing agent
of fine size upon application of mild pressure with the
toothbrush.
EXAMPLE V
200 parts of anhydrous dicalcium phosphate particles having sizes
substantially all of which are less than about 7.4 microns and 1
part of D&C Lake Red No. 30 color, are moistened with 40 parts
of a 10% aqueous solution of gum acacia in a Hobart mixer for 10
minutes. The dyed wet mass thereby formed is forced through a
screen having uniform openings of 2380 microns and oven dried for 1
hour at 65.degree. C. The dried agglomerates are then screened
through a screen having uniform openings of 840 microns onto a
screen having uniform openings of 420 microns.
10 parts of the dyed agglomerate particles which pass through the
screen having uniform openings of 840 microns and which are
retained on the screen having uniform openings of 420 microns are
blended with 90 parts of an opaque toothpaste having the following
formulation:
______________________________________ Percent
______________________________________ Glycerine (99.3%) 19.950
Sodium carboxymethyl cellulose 0.850 Sodium saccharin 0.200 Sodium
benzoate 0.500 Tetrasodium pyrophosphate 0.250 Water 19.986
Trimagnesium phosphate 0.200 Calcium carbonate 5.000 Dicalcium
phosphate dihydrate 46.550 Sodium N-lauroyl sarcosinate (35%) 5.714
Flavor 0.800 ______________________________________
The opaque toothpaste described in this example has visible
particles of the agglomerates distributed over its surface. During
toothbrushing the agglomerated particles are at first palpable and
are then easily reduced to individual particles of polishing agent
of fine size upon application of mile pressure with the
toothbrush.
Although this invention has been described with reference to
specific examples, it will be apparent to one skilled in the art
that various modifications may be made thereto which fall within
its scope.
* * * * *