U.S. patent application number 11/695646 was filed with the patent office on 2007-10-11 for low odor latex paint capable of reducing interior odors.
This patent application is currently assigned to The Sherwin-Williams Company. Invention is credited to Anne M. Andrews, Stuart F. Bedford, Jean M. Dukles, Christopher J. Fox, Jennifer L. Hanzlicek, Robert A. Martuch.
Application Number | 20070237738 11/695646 |
Document ID | / |
Family ID | 38461243 |
Filed Date | 2007-10-11 |
United States Patent
Application |
20070237738 |
Kind Code |
A1 |
Hanzlicek; Jennifer L. ; et
al. |
October 11, 2007 |
Low Odor Latex Paint Capable of Reducing Interior Odors
Abstract
A paint composition, which in some embodiments, has a low odor
in the container, while during after application to a surface, and
once the paint has dried on a surface is disclosed. A method of
making such a paint composition is disclosed. A paint composition
and method are also disclosed which include using a paint to
control certain odors in interior rooms.
Inventors: |
Hanzlicek; Jennifer L.;
(Macedonia, OH) ; Fox; Christopher J.;
(Wellington, OH) ; Dukles; Jean M.; (Fairview
Park, OH) ; Martuch; Robert A.; (Parma, OH) ;
Andrews; Anne M.; (Kent, OH) ; Bedford; Stuart
F.; (Hudson, OH) |
Correspondence
Address: |
THE SHERWIN-WILLIAMS COMPANY
101 PROSPECT AVENUE N.W.
1100 MIDLAND BLDG. - LEGAL DEPARTMENT
CLEVELAND
OH
44115-1075
US
|
Assignee: |
The Sherwin-Williams
Company
Cleveland
OH
|
Family ID: |
38461243 |
Appl. No.: |
11/695646 |
Filed: |
April 3, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60789077 |
Apr 4, 2006 |
|
|
|
Current U.S.
Class: |
424/76.2 ;
428/686; 524/48 |
Current CPC
Class: |
C09D 7/61 20180101; C09D
7/63 20180101; A61L 9/012 20130101; C08K 3/26 20130101; A61L 9/01
20130101; A61L 9/014 20130101; C08K 5/098 20130101; A61L 2/18
20130101; Y10T 428/12986 20150115; C09D 5/024 20130101 |
Class at
Publication: |
424/076.2 ;
428/686; 524/048 |
International
Class: |
A61L 9/00 20060101
A61L009/00; B32B 15/082 20060101 B32B015/082 |
Claims
1. A paint composition comprising: a binder; water; and sodium
bicarbonate, wherein at least some solid sodium bicarbonate is
dispersed in the paint composition.
2. The paint composition of claim 1, wherein the sodium bicarbonate
comprises about 3.2% to about 33% of the latex paint
composition.
3. The paint composition of claim 1, further comprising: and an
odor entrapping agent selected from zeolite, cyclodextrin,
activated carbon, anatase titanium dioxide, nano zinc oxide,
undecylenic acid, salts of undecylenic acid, esters of undecylenic
acid, and undecylenate silicone esters, chloramine-T, and zinc
ricinolate, and combinations thereof.
4. A paint composition comprising: a binder; water; sodium
bicarbonate, wherein the sodium bicarbonate is present at the
maximum level possible for the paint to remain a stable dispersion
for application.
5. The paint composition of claim 4, further comprising: and an
odor entrapping agent selected from zeolite, cyclodextrin,
activated carbon, anatase titanium dioxide, nano zinc oxide,
undecylenic acid, salts of undecylenic acid, esters of undecylenic
acid, and undecylenate silicone esters, chloramine-T, zinc
ricinolate, and combinations thereof.
6. The paint composition of claim 4, further comprising: a
re-odorant composition.
7. A paint composition comprising: a binder; water; a cyclodextrin;
and a zeolite.
8. The paint composition of claim 7, further comprising: sodium
bicarbonate.
9. The paint composition of claim 8 wherein the paint composition
comprises about 0.25 to about 40% by weight sodium bicarbonate.
10. The paint composition of claim 7 wherein the paint composition
comprises about 2% to about 5% zeolite.
11. The paint composition of claim 7 wherein the paint composition
comprises about 1% to about 3% cyclodextrin.
12. The paint composition of claim 7 wherein the cyclodextrin and
zeolite combined comprise up to about 20% by weight of the paint
composition.
13. The paint composition of claim 7, further comprising: a
reodorant.
14. A paint composition capable of reducing odors in an interior
room, said paint composition comprising: a binder; water; and an
odor neutralizing agent selected from undecylenic acid, salts of
undecylenic acid, esters of undecylenic acid, and undecylenate
silicone esters, and combinations thereof.
15. A process for reducing an odor emitted by aqueous latex-based
coating material comprising adding to the coating material during
or after its manufacture sodium bicarbonate.
16. The process of claim 15 wherein the odor reduced is the odor
emitted prior to application of the coating material to a
substrate.
17. The process of claim 15 wherein the odor reduced is the odor
emitted as the coating material dries after application to a
substrate.
18. The process of claim 15 wherein the odor reduced is the odor
emitted by the coating material after it has dried on a
substrate.
19. The process of claim 15, wherein the sodium bicarbonate is
added to a grind paste used to prepare the coating material.
20. The process of claim 15, wherein the sodium bicarbonate is
post-added to a finished paint composition.
21. A process for reducing odors in an interior room comprising:
applying a latex-based paint to one or more walls of said interior
room, said paint comprising: a binder, water, zeolite, and
cyclodextrin; and allowing said paint to dry.
22. The process of claim 21, wherein said latex-based paint further
comprises sodium bicarbonate.
23. The process of claim 22, wherein said paint composition
comprises up to about 40% by weight sodium bicarbonate.
24. A process for preventing rust formation comprising: applying a
paint composition comprising a binder, water, and sodium
bicarbonate to a metal surface; and allowing said paint to dry.
25. The process of claim 24 wherein the paint composition comprises
about 0.5% to about 8% by weight sodium bicarbonate.
26. A process for preventing the growth of bacteria on surfaces
comprising: applying a paint composition comprising a binder,
water, and sodium bicarbonate to a surface; and allowing said paint
to dry.
27. The process of claim 26 wherein the paint composition further
comprises a dry film preservative selected from carbendazim,
chlorothalonil, 3-iodo-2-propynyl butyl carbamate (IPBC),
1,2-benzisothaiazolin-3-one (BIT), sodium omadine, zinc omadine,
zinc oxide, tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione
solution,
5-hydroxymethoxymethyl-1-AZA-3,7-dioxabicyclo[3.3.0]octane
formaldehyde release type preservative,
2-n-octyl-4-isothiazolin-3-one, 1
-(3-chloroallyl)-3,5,7-triaza-1-azoniaadamantane chloride.
28. A dry paint film comprising: a cyclodextrin; and a zeolite.
29. The dry paint film of claim 28, further comprising: sodium
bicarbonate.
30. A dry paint film comprising: about 0.5% to about 17.3% by
weight sodium bicarbonate.
31. A method of manufacturing paint comprising: preparing a grind
paste comprising a latex binder, water, pigment, sodium
bicarbonate, wherein the pH of the paint is about 9.2.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority from co-pending U.S.
Provisional Application No. 60/789,077 filed on Apr. 4, 2006, the
entirety of which is hereby incorporated by reference.
BACKGROUND
[0002] Latex paint and coating compositions are commonly used for
providing protective or decorative coatings to walls or other
surfaces. Latex paint compositions usually comprise water, a
dispersed polymeric binder, and one or more pigments. The binder
may be selected from various known polymeric binders such as vinyl,
acrylic or urethane polymers.
[0003] Various odors are associated with latex paints. These odors
may arise from components of the paint composition, such as
buffers, solvents, biocides, thickening agents, or crosslinking
agents. In some cases, during manufacture of a paint, some of the
binder may decompose forming by-products such as acetates, short
chain aldehydes, ketones, and fatty acids. Any of these components
or other components can cause the paint to have an undesirable
odor.
[0004] Latex paints are often used to paint interior surfaces, such
as walls of residential and commercial buildings. Unpleasant odors,
including but not limited to various cooking odors, cigarette
smoke, pet odors, or mold or mildew odors etc. are often present in
various environments. Generally, such odors are reduced by using
agents such as air fresheners, scented candles, air purifiers,
ionizers, ozonizers, and electrostatic filters, or other known
agents or apparatus known to remove unpleasant odors from the air.
However, these means for reducing or masking odors work only
temporarily, need to be monitored or maintained, are not always
available, and may have harmful or dangerous side effects. Thus, a
continuous, passive, and unobtrusive means for reducing odors would
be helpful.
DETAILED DESCRIPTION OF THE INVENTION
[0005] The present invention relates to a latex paint, which, in
some embodiments, has a low odor whether in the container, while
drying after application to a surface, and once the paint has dried
on a surface. In addition, in some embodiments, a latex paint of
the present invention, when applied to an interior surface, is
capable of reducing odors in the area in which it is applied.
[0006] The present invention comprises a latex paint composition to
which odor absorbing or adsorbing material may be added. Such odor
absorbing or adsorbing materials may also be referred to herein as
"entrapping agents." Odor absorbing materials include but are not
limited to zeolites, cyclodextrins, and activated carbon. These
materials are typically porous, such that an odor particle may
associate with pores in the odor absorbing material to become
trapped within the pore, thus removing the odor from the air. Odor
adsorbing materials include activated carbon, sodium bicarbonate,
and cyclodextrins. Odor particles chemically or physically
associate with the surface of the odor adsorbing materials. Such
association normally chemically or physically alters both the odor
and the surface of the odor adsorbing material to remove the odor.
In some cases, such chemical alteration sacrifices some of the
surface activity of the adsorbing material. The present invention
may also optionally comprise an odor neutralizing agent. Exemplary
useful odor neutralizing agents include sodium bicarbonate,
undecylenic acid, salts of undecylenic acid, and esters of
undecylenic acid, undecylenate silicone esters, chloramine-T
(n-chloro-para-toluene sulfonamide sodium salt), zinc ricinoleate,
and combinations thereof. The latex paint of the present invention
may also comprise a fragrance emitting compound or a re-odorant.
Examples of fragrance emitting compounds or re-odorants include,
but are not limited to cinnamaldehyde, citronella, eugenol, and
vanilla extract or other natural extracts. Various other fragrances
are commercially available from suppliers such as Shaw Mudge,
Arylessence, or JE Sozio. In some cases, fragrances may be mixed
with an odor neutralizing compound as described herein. In
embodiments that include a fragrance compound, the fragrance may
emit a pleasant scent while the other components of the paint
reduce or neutralize malodors. Other materials such as
nano-titanium dioxide or zinc oxide or anatase titanium dioxide,
which are capable of degrading odors in the presence of an
initiator, such as light, may also be used in some embodiments.
Further, dry film preservatives, such as fungicides, biocides, or
algaecides can be added as an odor preventative for certain
environments that tend to have higher amounts of mold or mildew
growth.
[0007] The odor reducing materials listed above or a fragrance may
be post-added to an existing latex paint formulation. In one
embodiment, one or more of these materials may be incorporated into
a latex paint composition during the manufacture of the latex paint
as will be described in more detail herein.
[0008] One type of odor absorbing or adsorbing material that may be
useful in the present invention is a zeolite. One useful type of
zeolite are the "intermediate" silicate/aluminate zeolites. The
intermediate zeolites are characterized by SiO.sub.2/AlO.sub.2
molar ratios of less than about 10. In one useful embodiment, the
molar ratio of SiO.sub.2/AlO.sub.2 ranges from about 2 to about 10.
The intermediate zeolites may have an advantage over the "high"
zeolites in that they have a higher affinity for odors, they are
more weight efficient for odor adsorption because they have a
larger surface area, and they are more moisture tolerant and retain
more of their odor absorbing capacity in water than the high
zeolites. However, it is contemplated that high zeolites may be
used in the present invention as well. One example of a useful
zeolite is crystalline aluminum silicate. A variety of zeolites
suitable for use herein are commercially available and include
VALFOR.RTM. CP301-68, VALFOR.RTM. CP300-63, VALFOR.RTM. CP300-35,
and VALFOR.RTM. CP300-56 available from PQ Corporation; zeolites
marketed under the trademarks ABSCENTS and SMELLRITE by Union
Carbide Corporation and UOP; and SYLOSIV K300 or SYLOSIV A3 from
Grace Davison. Zeolites used in the present invention may be in the
form of a powder having a particle size that is for example, less
than about 40 microns, further for example, less than about 20
microns, even further for example, less than about 10 microns, and
finally for example, about 3 to about 5 microns.
[0009] Zeolites may be included in paint formulations of the
present invention in amounts up to about 10% by weight of a total
paint formulation. For example, a zeolite may comprise about 2% to
about 5% by weight of a total paint formulation, for example about
2.5% to about 3%.
[0010] Another type of odor adsorbing or absorbing material that
may be useful are cyclodextrins. The "cyclodextrin" may be any of
the known cyclodextrins such as unsubstituted cyclodextrins
containing from six to twelve glucose units, especially
alpha-cyclodextrin, beta-cyclodextrin, gamma-cyclodextrin and/or
their derivatives and/or mixtures thereof. The alpha-cyclodextrin
consists of six glucose units, the beta-cyclodextrin consists of
seven glucose units, and the gamma-cyclodextrin consists of eight
glucose units arranged in donut-shaped rings. The specific coupling
and conformation of the glucose units give the cyclodextrins a
rigid, conical molecular structure with hollow interiors of
specific volumes. The "lining" of each internal cavity is formed by
hydrogen atoms and glycosidic bridging oxygen atoms; therefore,
this surface is fairly hydrophobic. The shape and physical-chemical
properties of the cavity enable the cyclodextrin molecules to
absorb (form inclusion complexes with) organic molecules or parts
of organic molecules which can fit into the cavity, especially the
malodor molecules which exist in latex paints and other aqueous
coatings. Therefore, cyclodextrins, and especially mixtures of
cyclodextrins with different size cavities, can be used to complex
with the unwanted odor molecules. The complexation between
cyclodextrin and the malodorous molecules occurs particularly
rapidly in the presence of water. However, the extent of the
complex formation can also depend on the polarity of the absorbed
malodor molecules. Other cyclodextrins can be specifically designed
and tailored to specific malodors and can be used in this manner as
well.
[0011] In one embodiment, the cyclodextrins contemplated for use in
the present invention are highly water-soluble, such as
alpha-cyclodextrin and/or derivatives thereof, gamma-cyclodextrin
and/or derivatives thereof, derivatized beta-cyclodextrins, and/or
mixtures thereof. The derivatives of cyclodextrin consist mainly of
molecules wherein some of the OH groups are converted to OR groups.
Cyclodextrin derivatives include, for instance, those with short
chain alkyl groups such as methylated cyclodextrins, and ethylated
cyclodextrins, wherein R is a methyl or an ethyl group; those with
hydroxyalkyl substituted groups, such as hydroxypropyl
cyclodextrins and/or hydroxyethyl cyclodextrins, wherein R is a
CH.sub.2--CH(OH)--CH.sub.3 or a CH.sub.2CH.sub.2--OH group;
branched cyclodextrins such as maltose-bonded cyclodextrins;
cyclodextrin glycerol ethers with structure analogous to
hydroxypropyl cyclodextrins, but with the side chains forming
--CH.sub.2CH(CH.sub.2OH)-- bridges between 2' and 3' hydroxyl
oxygens on the glucosyl units; cationic cyclodextrins such as those
containing 2-hydroxy-3-(dimethylamino)propyl ether, wherein R is
CH.sub.2--CH(OH)--CH.sub.2--(CH.sub.3).sub.2 which is cationic at
low pH; quaternary ammonium, e.g.,
2-hydroxy-3-(trimethyl-ammonio)propyl ether chloride groups,
wherein R is CH.sub.2--CH(OH)--CH.sub.2--N+(CH.sub.3).sub.3CI--;
anionic cyclodextrins such as carboxymethyl cyclodextrins,
cyclodextrin sulfates, and cyclodextrin succinylates; amphoteric
cyclodextrins such as carboxymethyl/quaternary ammonium
cyclodextrins; cyclodextrins wherein at least one glucopyranose
unit has a 3-6-anhydro-cyclomalto structure, e.g., the
mono-3-6-anhydrocyclodextrins, and mixtures thereof. Other
cyclodextrin derivatives are disclosed in U.S. Patent Application
Publication No. 2002-0132861 and the references cited therein.
[0012] Highly water-soluble cyclodextrins are those having water
solubility of at least about 10 g in 100 ml of water at room
temperature, for example, at least about 20 g in 100 ml of water,
and further for example, at least about 25 g in 100 ml of water at
room temperature.
[0013] Examples of water-soluble cyclodextrin derivatives suitable
for use herein are hydroxypropyl alpha-cyclodextrin, methylated
alpha-cyclodextrin, methylated beta-cyclodextrin, hydroxyethyl
beta-cyclodextrin, hydroxypropyl beta-cyclodextrin, hydroxypropyl
gamma-cyclodextrin, and methylated gamma-cyclodextrin. Hydroxyalkyl
cyclodextrin derivatives preferably have a degree of substitution
of from about 1 to about 14, for instance, from about 1.5 to about
7, wherein the total number of OR groups per cyclodextrin is
defined as the degree of substitution. Methylated cyclodextrin
derivatives typically have a degree of substitution of from about 1
to about 18, preferably from about 3 to about 16. A known
methylated beta-cyclodextrin is
heptakis-2,6-di-O-methyl-beta-cyclodextrin, commonly known as
DIMEB, in which each glucose unit has about 2 methyl groups with a
degree of substitution of about 14. One useful, commercially
available, methylated beta-cyclodextrin is a randomly methylated
beta-cyclodextrin, commonly known as RAMEB, having different
degrees of substitution. Such cyclodextrins are commercially
available, for instance, from Cerestar USA, Inc. and Wacker
Chemicals (USA), Inc.
[0014] Additional useful cyclodextrins include cyclohexylamylose,
cycloheptylamylose, and cyclooctaamylose available as CAVAMAX W-6,
W-7, and W-8 respectively from Wacker Chemicals, Inc.
[0015] In one embodiment, a mixture of cyclodextrins may be used.
Such mixtures may absorb odors more broadly by complexing with a
wider range of odoriferous molecules having a wider range of
molecular sizes. At least a portion of the cyclodextrins may be
alpha-cyclodextrin and derivatives thereof, gamma-cyclodextrin and
derivatives thereof, and/or derivatized beta-cyclodextrin; for
example, a mixture of alpha-cyclodextrin, or an alpha-cyclodextrin
derivative, and derivatised beta-cyclodextrin, further for example,
a mixture of derivatised alpha-cyclodextrin and derivatised
beta-cyclodextrin; and finally for example, a mixture of
hydroxypropyl alpha-cyclodextrin and hydroxypropyl
beta-cyclodextrin, and/or a mixture of methylated
alpha-cyclodextrin and methylated beta-cyclodextrin.
[0016] When used in paint formulations of the present invention, a
cyclodextrin or mixtures of cyclodextrins may comprise up to about
10% by weight of the paint. In one useful embodiment, a
cyclodextrin or mixtures of cyclodextrins may comprise about 1% to
about 3%, for example, about 1.5 to about 2% by weight of the paint
formulation.
[0017] In one embodiment of the present invention, the entrapping
agent, such as cyclodextrin, is used in uncomplexed form. The same
may apply to other entrapping agents used in the invention. That
is, they are added in a form such that they are capable of forming
complexes with the odor molecules present in the latex-based
coating material to be treated.
[0018] In another useful embodiment of the present invention,
activated carbon may be used as an odor absorbing or adsorbing
material. Carbon materials that may be suitable for use in the
present invention include, but are not limited to those materials
known commercially as absorbents for organic molecules or for air
purification purposes. Various types of activated carbon are
commercially available from companies such as Calgon Carbon
Corporation, or LQ-325 available from Carbochem, Inc. In one useful
embodiment, activated carbon particles used in the present
invention have a particle size of about 40 microns or less. When
used as an odor entrapping agent in the present invention,
activated carbon may be included in paints in amounts up to about
5% by weight of the total paint, for example, about 2% to about 3%
by weight.
[0019] Another useful odor neutralizing/entrapping agent is sodium
bicarbonate. Although commercial grades of sodium bicarbonate may
be used in the present invention, in some embodiments of the
invention, finer grades of sodium bicarbonate may be particularly
useful, especially when larger amounts of sodium bicarbonate are
included in the paint formulation. The use of such smaller solid
particles may result in a more attractive appearance of the dried
paint film. For example, in one embodiment, the sodium bicarbonate
particles may be the same size as typical extender pigment
particles used in latex paint formulations. As another example, the
sodium bicarbonate particles may have a maximum particle size of
about 90 microns or less, for example the maximum particle size may
be about 70 microns, about 60, microns, about 50 microns, about 40
microns, about 35 microns, about 30 microns, about 25 microns,
about 20 microns, about 15 microns, or about 10 microns. In some
embodiments, the particle size of the sodium bicarbonate may be
measured by the mean particle size. The mean particle size may be
for example, about 90 microns, about 70 microns, about 60 microns,
about 50 microns, about 40 microns, about 35 microns, about 30
microns, about 25 microns, about 20 microns, about 15 microns,
about 10 microns, or about 5 microns.
[0020] In one useful embodiment of the present invention, sodium
bicarbonate may be added up to the maximum amount wherein the paint
will remain a stable dispersion for application. In another
embodiment, sodium bicarbonate may be added up to the maximum
amount wherein the paint will remain a stable dispersion for
application with some solid sodium bicarbonate dispersed in the
paint. In another embodiment, sodium bicarbonate may be added in a
sufficient amount for at least some solid sodium bicarbonate to be
dispersed in the paint such that the sodium bicarbonate may be
redispersed if settling occurs during storage. In other
embodiments, the sodium bicarbonate may be dissolved in the paint
composition. For example, in some paints, sodium bicarbonate may be
added in amounts up to about 40% by weight of the total paint
composition. In an alternative embodiment, the sodium bicarbonate
may comprise about 0.25% to about 33% by weight of the paint
composition. Further for example, the sodium bicarbonate may
comprise at least 3.2% by weight of the paint formulation, for
example, about 5% to about 10% by weight of the paint composition.
Even further for example, the sodium bicarbonate may comprise about
7% to about 9% by weight of the paint composition.
[0021] In another embodiment, the amount of sodium bicarbonate
added to a paint may be calculated based on the amount of sodium
bicarbonate in the paint film when dried. In one useful embodiment,
sodium bicarbonate may comprise about 0.5% to about 17.3% of a dry
paint film.
[0022] In one useful embodiment of the present invention, an agent
may be added to a paint composition to raise the pH of the paint to
lower the solubility of sodium bicarbonate in the paint
composition. Such a pH increasing agent may allow additional
loading of sodium bicarbonate into a paint composition to increase
the free solid sodium bicarbonate in the paint. In one useful
embodiment, a paint composition containing sodium bicarbonate may
be made wherein the pH of the paint composition is about 9.2.
[0023] Paints containing sodium bicarbonate as described herein may
also be useful for preventing rust formation on metal surfaces to
which the paint is applied. Paints containing about 0.5 to about
8%, for example, about 1%, about 2%, and about 4%, by weight sodium
bicarbonate have been observed to reduce or eliminate the formation
of rust or flash rusting. In addition, paint containing sodium
bicarbonate as described herein may be able to inhibit the growth
of bacteria in containers of paint and on surfaces to which paint
is applied. The inhibition of bacterial, mold or fungal growth was
observed with the use of sodium bicarbonate alone or in combination
with other dry film preservatives as described herein.
[0024] Odor neutralizing agents may also be added to latex paints
of the present invention. One useful type of odor neutralizing
agent is disclosed in U.S. Pat. No. 6,495,097. This patent
discloses undecylenic acid, salts of undecylenic acid (e.g. sodium,
calcium, and zinc), simple esters of undecylenic acid (e.g. methyl,
ethyl, propyl, and butyl), undecylenate silicone esters, and
combinations of undecylenic acid esters as odor neutralizing
agents.
[0025] The various odor entrapping/neutralizing agents described
above may be added to paint alone or in various combinations.
Useful combinations include, but are not limited to, sodium
bicarbonate and undecylenic acid, salts of undeceylenic acid, or
esters of undecylenic acid; sodium bicarbonate and zeolite; sodium
bicarboate, zeolite and cyclodextrin; and zeolite and cyclodextrin.
The combinations of entrapping/neutralizing agents may be added in
amounts up to about 20% by weight of the paint composition, for
example up to about 10% by weight, further for example up to about
5% by weight. It is contemplated that formulations containing these
odor entrapping/neutralizing agents will be capable of reducing the
odor emitted by the paint itself both prior to application as well
as in the applied paint and in the dried paint film. It is also
contemplated that paints containing the odor
entrapping/neutralizing agents as described herein will be capable
of reducing odors in an interior room where the paint is
applied.
[0026] Dry film preservatives, such as biocides or fungicides, may
also be added to paints to prevent odors. Chemicals used as
biocides or fungicides include, but are not limited to carbendazim,
chlorothalonil, 3-iodo- 2-propynyl butyl carbamate (IPBC),
1,2-benzisothaiazolin-3-one (BIT), sodium omadine, zinc omadine,
zinc oxide, tetrahydro-3, 5-dimethyl-2H-1,3,5-thiadiazine-2-thione
solution,
5-hydroxymethoxymethyl-1-AZA-3,7-dioxabicyclo[3.3.0]octane
formaldehyde release type preservative,
2-n-octyl-4-isothiazolin-3-one,
1-(3-chloroallyl)-3,5,7-triaza-1-azoniaadamantane chloride. Various
such biocides or fungicides are commercially available such as
Mergal BCM from Troy Chemical Company, Nuocide 960 from ISP
Technologies, Inc., Arch Zinc Omadine and Proxel GXL from Arch
Chemicals. Depending on the activity of a particular biocide or
fungicide (either solid or in solution), the biocide may comprise
about 0.05% to about 1.2% by weight of the total paint
formulation.
[0027] Paint compositions in which the odor entrapping or
neutralizing agents may be useful generally contain from about 2%
to about 65% by weight binder, for example, about 15% to about 25%.
Binders useful in latex paint compositions are known in the art and
include polymeric binders, such as acrylics, or non-polymeric
binders. The water content may be from about 30% to about 95%, for
instance from about 40% to about 65%. The composition may also
include thickeners, such as urethane thickeners, hydroxyethyl
cellulose thickeners, and acrylic thickeners in amounts up to about
10% by weight, for example about 1% to about 2%. The content of
inorganic materials may be from about 5% to about 50% by weight,
for example, about 10% to about 40%. Such inorganic components may
comprise titanium dioxide (e.g. 0 to about 30% titanium dioxide)
based on the nature of the coating compositions. Other colored
pigments may also be used alone or in combination to produce a wide
range of colored paint. Suitable additional pigments may include
calcium carbonate, talc, clay, silicates, aluminum silicates,
calcium metasilicates, aluminum potassium silicates, magnesium
silicates, barium sulfates, nepheline syenite, feldspar, zinc
oxides or sulfides, or others known to those skilled in the art.
Such pigments may be included in amounts up to about 60% by weight,
for example, about 10% to about 20%. Synthetic organic materials
might also be incorporated; these include plastic beads, hollow
spheres or other similar materials. Other optional components
include glycols such as ethylene and/or propylene glycol in amounts
from 0 to about 7% and other solvents such as diethylene glycol
dibenzoate and dipropylene glycol dibenzoate in amounts up to about
3%. The coating composition may also contain pigment dispersing
agents which can be solvents or surfactants; biocides such as amine
or sulfur compounds, halogen donors, or metals; foam control agents
such as oils, fatty acids and silicones; slip and mar additives;
adhesion promoters, and/or other known paint additives.
[0028] In use in latex paint formulations, the solid odor
entrapping or neutralizing agents, such as sodium bicarbonate,
cyclodextrins, zeolites, and activated carbon may be added to an
existing paint, either in solid form, or in a slurry with water or
other appropriate carrier liquid. In another embodiment, such solid
odor entrapping agents may be incorporated into the pigment grind
paste used to manufacture the paint. Methods for making pigment
grind pastes are well known in the art. In still another
embodiment, some quantity of the odor entrapping/neutralizing agent
or agents may be added during manufacture (such as to the grind
paste) while another quantity may be post-added to the finished
paint. In one useful embodiment, adjustments may be made to the
remainder of the paint formulation to accommodate for the
additional solid materials incorporated into the grind paste. Such
modifications would be understood by those skilled in the art. Both
post adding such odor reducing materials or adding such odor
reducing materials to the grind paste, in some embodiments, may
reduce the odor emitted prior to application of the coating to the
substrate as well as odors emitted as the coating dries after
application and after the coating, and odors emitted after the
coating has dried.
[0029] In order to control odors in an interior room, the odor
entrapping or neutralizing agents, such as sodium bicarbonate,
zeolites, cyclodextrin, activated carbon, and undecylenic acid and
its derivatives, may be added to a paint composition, alone or in
various combinations, either during or after the manufacture of the
paint. The paint may be applied to one or more walls of an interior
room where it is desired to reduce odors on a continuous basis. In
some embodiments of the invention, after such paint has dried, it
is contemplated that the paint composition will reduce odors
introduced into the room on a continuous basis for a period of
time.
[0030] The present invention will be better understood by reference
to the following examples, which are provided for purposes of
illustration only and are not to be construed as limiting the scope
of the present invention. As used in the example, unless otherwise
noted, "Parts by Weight" means weight percent.
EXAMPLE 1
[0031] A representative odor-reducing latex coating composition may
be prepared by admixing the following ingredients: TABLE-US-00001
Raw Material Parts by Weight Styrene Acrylic Latex.sup.1 23.34
Titanium Dioxide slurry 20.42 Water 19.11 Nepheline syenite 11.25
Sodium Bicarbonate 8.00 Calcium Carbonate 4.62 Aluminum Silicate
slurry.sup.2 4.04 Aluminum potassium silicate 2.31 25% Sodium
Hydroxide Solution 1.75 Calcined clay 1.44 Thickener.sup.3 1.00
Mineral Oil Defoamer.sup.4 0.60 Plasticizer.sup.5 0.60
Thickener.sup.6 0.33 Tetra-potassium pyrophosphate 0.28 Nonionic
surfactant.sup.7 0.27 Surfactant.sup.8 0.27 Zinc omadine 45%
solution 0.21 Benzisothiazolone biocide 0.15 .sup.1A proprietary
styrene acrylic latex of the assignee of this application.
.sup.2Such slurries are commercially available and generally
comprise various combinations of dry pigment and one or more of:
dispersant and/or surfactant, buffer, biocide, water, and/or
defoamers. .sup.3ACRYSOL SCT-275 from Rohm & Haas.
.sup.4SHERDEFOAM #2--a proprietary defoamer of the assignee of this
application. .sup.5BENZOFLEX B-50 plasticizer from Velsicol
Chemical. .sup.6ACRYSOL TT-935 from Rohm & Haas. .sup.7TRITON
N-57 nonionic surfactant from Dow Chemical. .sup.8DEXTROL OC-50
anionic surfactant from Dexter Chemical LLC
[0032] In this example, the sodium bicarbonate may be incorporated
into the grind paste during the manufacture of the paint.
EXAMPLE 2
[0033] A representative odor reducing latex coating composition may
be prepared by admixing the following ingredients: TABLE-US-00002
Raw Material Parts by Weight Latex of Example 1 23.5 Water 21.5
Titanium Dioxide slurry 20.6 Nepheline syenite 13.6 Calcium
Carbonate 5.6 Aluminum Silicate slurry 4.8 Aluminum potassium
silicate 2.6 Zeolite 2.5 Calcined clay 1.8 SHERDEFOAM #2 0.6
BENZOFLEX B-50 0.6 ACRYSOL SCT-275 0.4 ACRYSOL TT-935 0.4 25%
Sodium Hydroxide Solution 0.3 Tetra-potassium pyrophosphate 0.3
TRITON N-57 surfactant 0.3 DEXTROL OC-50 surfactant 0.3 Zinc
omadine 48% solution 0.2 Benzisothiazolone biocide 0.2
[0034] In this example, the zeolite may be incorporated into the
grind paste during the manufacture of the paint.
EXAMPLE 3
[0035] A representative odor reducing latex coating composition may
be prepared by admixing the following ingredients: TABLE-US-00003
Raw Material Parts by Weight Latex of Example 1 23.5 Water 21.5
Titanium Dioxide slurry 20.6 Nepheline syenite 13.6 Calcium
Carbonate 5.6 Aluminum Silicate slurry 4.8 Aluminum potassium
silicate 2.6 Cyclodextrin 2.5 Calcined clay 1.8 SHERDEFOAM #2 0.6
BENZOFLEX B-50 0.6 ACRYSOL SCT-275 0.4 ACRYSOL TT-935 0.4 25%
Sodium Hydroxide Solution 0.3 Tetra-potassium pyrophosphate 0.3
TRITON N-57 surfactant 0.3 DEXTROL OC-50 surfactant 0.3 Zinc
omadine 48% solution 0.2 Benzisothiazolone biocide 0.2
In this example, the cyclodextrin may be incorporated into the
grind paste during the manufacture of the paint.
EXAMPLE 4
[0036] A representative odor reducing latex coating composition may
be prepared by admixing the following ingredients: TABLE-US-00004
Raw Material Parts by Weight Latex of Example 1 23.6 Water 21.7
Titanium Dioxide slurry 20.6 Nepheline syenite 12.1 Calcium
Carbonate 4.9 Aluminum Silicate slurry 4.2 Aluminum potassium
silicate 2.6 Zeolite 2.5 Cyclodextrin 2.5 Calcined clay 1.6
SHERDEFOAM #2 0.6 BENZOFLEX B-50 0.6 ACRYSOL SCT-275 0.4 ACRYSOL
TT-935 0.4 25% Sodium Hydroxide Solution 0.3 Tetra-potassium
pyrophosphate 0.3 TRITON N-57 surfactant 0.3 DEXTROL OC-50
surfactant 0.3 Zinc omadine 48% solution 0.2 Benzisothiazolone
biocide 0.2
[0037] In this example, the zeolite and cyclodextrin may be
incorporated into the grind paste during the manufacture of the
paint.
EXAMPLE 5
[0038] A representative odor reducing latex coating composition may
be prepared by admixing the following ingredients: TABLE-US-00005
Raw Material Parts by Weight Titanium Dioxide slurry 23.7 Vinyl
Acrylic Latex.sup.1 23.2 Water 17.3 Calcite 15.2 Opaque
Polymer.sup.2 6.3 Aluminum Silicate Slurry 5.9 Zeolite 2.4
Cyclodextrin 1.4 Butyl Carbitol 0.8 Dispersant.sup.3 0.8
Defoamer.sup.4 0.6 BENZOFLEX B-50 0.6 Hydrous Magnesium Aluminum
Silicate 0.4 Urethane Thickener.sup.5 0.3 ACRYSOL SCT-275 0.3
Nonionic surfactant.sup.6 0.3 Zinc omadine 48% solution 0.3
2-amino-2-methyl-1-propanol (95%) 0.1 Cellulosic Thickener 0.04
Benzisothiazolone biocide 0.02 Yellow Colorant 0.008 Red Colorant
0.005 Blue Colorant 0.002 .sup.1A variety of commercially available
acrylic latexes may be used, for example, various vinyl acrylic
latexes are available from the UCAR Emulsion Systems division of
Dow Chemicals. .sup.2ROPAQUE OP-96 from Rohm & Haas.
.sup.3TAMOL 731A from Rohm & Haas. .sup.4SHERDEFOAM #1, a
proprietary defoamer of the assignee of the present application.
.sup.5ACRYSOL RM-2020 from Rohm & Haas. .sup.6TRITON X-102 from
Dow.
EXAMPLE 6
[0039] A representative odor reducing latex coating composition may
be prepared by admixing the following ingredients: TABLE-US-00006
Raw Material Parts by Weight Calcium Carbonate 27.3 Vinyl Acrylic
Latex of Example 5 23.4 Titanium Dioxide slurry 23.4 Water 14.4
Zeolite 3.0 Opaque Polymer.sup.2 1.9 Cyclodextrin 1.7 Butyl
Carbitol 0.8 TAMOL 731A 0.8 ACRYSOL RM-2020 0.8 SHERDEFOAM #1 0.6
ACRYSOL SCT-275 0.5 BENZOFLEX B-50 0.3 Sodium Bicarbonate 0.3
Hydrous Magnesium Aluminum Silicate 0.2 2-amino-2-methyl-1-propanol
(95%) 0.2 TRITON X-102 surfactant 0.2 Zinc omadine 48% solution 0.2
Benzisothiazolone biocide 0.02
[0040] In this example, the cyclodextrin, zeolite and sodium
bicarbonate may be incorporated into the grind paste during the
manufacture of the paint.
EXAMPLE 7
[0041] A representative odor reducing latex coating composition may
also be prepared by mixing 30 parts by weight sodium bicarbonate
into a paint made according to Example 4.
EXAMPLE 8
[0042] Sodium bicarbonate, zeolite, cyclodextrin, and activated
carbon were each added to separate batches of commercial paint
compositions, SUPERPAINT.RTM. exterior satin and DURATION HOME.RTM.
interior satin paint, available from the assignee of the present
application. The sodium bicarbonate was post-added to finished
paint compositions in an amount of 8% by weight of the total paint.
The zeolite, cyclodextrin, and activated carbon were each
post-added added in amounts of 2% by weight of the total paint.
Individuals were asked to evaluate the smell of the same paint with
and without the odor reducing agents. For these two paints, it was
observed that the paints having the odor reducing agent added had
less odor than the paint without the odor reducing agent added.
[0043] While the present invention has been illustrated by the
description of embodiments thereof, and while the embodiments have
been described in considerable detail, it is not the intention of
the applicants to restrict or in any way limit the scope of the
appended claims to such detail. For example, although the invention
has been described with reference to latex paints, it is
contemplated that the concepts herein may also be applicable to
other types of paints that are known in the art. Additional
advantages and modifications will readily appear to those skilled
in the art. Therefore, the invention, in its broader aspects, is
not limited to the specific details, the representative apparatus,
and illustrative examples shown and described. Accordingly,
departures may be made from such details without departing from the
spirit or scope of the applicant's general inventive concept.
* * * * *