WO2016022348A1 - Water-absorbing (meth) acrylic resin with optical effects, and related compositions - Google Patents

Water-absorbing (meth) acrylic resin with optical effects, and related compositions Download PDF

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Publication number
WO2016022348A1
WO2016022348A1 PCT/US2015/042608 US2015042608W WO2016022348A1 WO 2016022348 A1 WO2016022348 A1 WO 2016022348A1 US 2015042608 W US2015042608 W US 2015042608W WO 2016022348 A1 WO2016022348 A1 WO 2016022348A1
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Prior art keywords
water
meth
weight
absorbing polymer
group
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PCT/US2015/042608
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French (fr)
Inventor
Fatemeh Mohammadi
Lisa Qu
Emi Akabane
Original Assignee
Elc Management Llc
Shin-Etsu Chemical Co., Ltd.
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Application filed by Elc Management Llc, Shin-Etsu Chemical Co., Ltd. filed Critical Elc Management Llc
Priority to ES15829864T priority Critical patent/ES2774389T3/en
Priority to CA2956219A priority patent/CA2956219C/en
Priority to AU2015298556A priority patent/AU2015298556B2/en
Priority to EP15829864.6A priority patent/EP3177268B1/en
Priority to KR1020177002826A priority patent/KR101910299B1/en
Priority to JP2017505841A priority patent/JP6391804B2/en
Priority to CN201580041712.0A priority patent/CN106572965B/en
Publication of WO2016022348A1 publication Critical patent/WO2016022348A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q1/00—Make-up preparations; Body powders; Preparations for removing make-up
    • A61Q1/02—Preparations containing skin colorants, e.g. pigments
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • A61K8/8152—Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
    • A61K8/89—Polysiloxanes
    • A61K8/895—Polysiloxanes containing silicon bound to unsaturated aliphatic groups, e.g. vinyl dimethicone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00—Preparations for care of the skin
    • A61Q19/08—Anti-ageing preparations
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F230/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal
    • C08F230/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing phosphorus
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
    • C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
    • C08F290/06—Polymers provided for in subclass C08G
    • C08F290/068—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C08K5/541—Silicon-containing compounds containing oxygen
    • C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/20—Chemical, physico-chemical or functional or structural properties of the composition as a whole
    • A61K2800/26—Optical properties

Definitions

  • water-absorbing polymers are used in agueous cosmetics and agueous skin external drugs as a thickening/gelling agent for stabilizing the system.
  • the water-absorbing polymers have the drawback that they give an unpleasant slimy feel on use. This is because the polymer forms a gel network structure, which is stable and thus difficult to break down on use. Because of the unpleasant feel, sometimes the use of the cosmetic or drug must be interrupted. While it is desired to solve the problem, non- silicone water-absorbing polymers are unsatisfactory. See Patent Document 1.
  • Patent Documents 2 and 3 propose water-absorbing polymers having a silicone structure incorporated therein and cosmetic compositions comprising the same. These water-absorbing polymers still have problems including difficult control of three-dimensional structure due to cross linking of epoxy groups, and a change with time of water absorption capability.
  • Patent Document 1 JP-A 2000-327516
  • Patent Document 2 WO 2007/130412
  • a skin external composition is
  • FIG. 1 shows photographs taken at two minutes of glass slides onto which the invention and comparative compositions were applied according to the procedure in Example 2.
  • FIG. 2 shows photographs taken at 2 hours of glass slides onto which the invention and comparative compositions were applied according to the procedure in Example 2.
  • Component (A) is a phosphate-containing (meth ) acrylic monomer.
  • a monomer has a phosphate group and a (meth ) acrylic group
  • the structure of a linkage for connecting these two groups is not particularly limited.
  • Exemplary linkages include alkylene groups such as methylene, ethylene and propylene and oxyalkylene groups such as oxyethylene, oxypropylene, oxybutylene, oxypentamethylene and mixtures thereof. Of these, polyoxyalkylene groups are preferred, with polyoxypropylene being most preferred.
  • the monomer is commercially available, for example, under the tradename of Sipomer PAM-200 from Rhodia.
  • (meth ) acrylic monomer which may be formed by adding an alkaline agueous solution to the phosphate-containing
  • Component (B) is a monomer having one (meth) acrylic group within the molecule other than component (A) .
  • (meth ) acrylic monomers include (meth) acrylic acid, maleic acid, maleic anhydride, fumaric acid, crotonic acid, itaconic acid, 2- (meth) acrylamide-2-methylpropanesulfonic acid,
  • (meth) acryloxyalkanesulfonic acid N-vinyl-2-pyrrolidone, N- vinylacetamide, (meth) acrylamide, N-isopropyl (meth) acrylate, N, -dimethyl (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, polyethylene glycol (meth) acrylate, and strearyl acrylate.
  • (meth ) acrylic monomer may be formed by adding an alkaline agueous solution to the (meth) acrylic monomer.
  • the “salt” includes alkali metal salts such as sodium, potassium and lithium, alkaline earth metal salts such as calcium, magnesium and barium, and ammonium salts such as guaternary ammonium and guaternary alkyl ammonium. Inter alia, sodium salt is the most common and preferred.
  • Neutralization treatment is preferably carried out at a temperature of 10 to 100°C, more preferably 20 to 90°C.
  • Acrylic acid or polyacrylic acid following polymerization may be neutralized with a base.
  • Neutralization prior to polymerization is preferred because it is time consuming to post-neutralize non-neutralized or low- neutralized (specifically a degree of neutralization of less than 30 mol%) polyacrylic acid following polymerization.
  • the water-absorbing polymer of the invention preferably has a degree of neutralization of 0.01 to 100%, more preferably 1 to 90%, and even more preferably 20 to 80% based on the moles of acid groups in the polymer.
  • Component (C) is an organopolysiloxane having a
  • R 1 is each independently an aliphatic unsaturation-free monovalent hydrocarbon group having 1 to 8 carbon atoms.
  • R 2 is a group containing a polyoxyalkylene group having the general formula ( 2 ) :
  • R is each independently a divalent organic group having 2 to 15 carbon atoms, x and y each are an integer of 0 to 30, meeting 1 ⁇ x+y ⁇ 50.
  • R 3 is a substituent group having a (meth) acrylic group, a is an integer inclusive of 0 and b is an integer of at least 1.
  • Examples of the monovalent hydrocarbon group represented by R 1 include alkyl groups such as methyl, ethyl and butyl, cycloalkyl groups such as cyclopentyl and cyclohexyl, aryl groups such as phenyl and tolyl, and aralkyl groups such as benzyl and phenethyl .
  • alkyl groups such as methyl, ethyl and butyl
  • cycloalkyl groups such as cyclopentyl and cyclohexyl
  • aryl groups such as phenyl and tolyl
  • aralkyl groups such as benzyl and phenethyl .
  • alkyl groups of 1 to 4 carbon atoms and phenyl are preferred, with methyl being most preferred .
  • R 4 is each independently selected from divalent organic groups having 2 to 15 carbon atoms, for example, -(CH 2 ) 2 -, -(CH 2 ) 3 -, -(CH 2 ) 4 -, -CH 2 CH ( CH 3 ) CH 2 -, -(CH 2 ) 8 -, and -(CH 2 )n-. Inter alia, -(CH 2 ) 2 -, -(CH 2 ) 3 -, and -(CH 2 ) - are preferred.
  • Each of x and y is an integer of 0 to 30, meeting 1 ⁇ x+y ⁇ 50.
  • each of x and y is an integer of 5 to 25, more preferably 10 to 20, and the sum of x+y is 10 to 45, more preferably 20 to 40.
  • (meth ) acrylic monomer and/or salt (A) is preferably present in a content of 30 to 95% by weight.
  • a polymer containing less than 30% by weight of monomer (A) may be less water absorptive whereas a polymer containing more than 95% by weight of monomer (A) may not become pasty after water absorption.
  • the content of monomer (A) is more preferably 40 to 95% by weight, and even more preferably 50 to 80% by weight. Also preferably, the
  • (meth ) acrylic monomer and/or salt (B) is present in a content of 4 to 50% by weight, more preferably 15 to 50% by weight, and the organopolysiloxane (C) is present in a content of 0.01 to 20% by weight, more preferably 2 to 20% by weight.
  • the water-absorbing polymer may be prepared typically by radical polymerization reaction. Although the procedure is not particularly limited, the polymer may be prepared, for example, by diluting monomers (A) and (B) with a solvent, optionally adding an alkali, and polymerizing the monomers with siloxane (C) in the presence of (D) a radical initiator.
  • the radical polymerization mode for preparing the water- absorbing polymer is not particularly limited. While bulk polymerization and precipitation polymerization are acceptable, reverse phase suspension polymerization, spray or dropwise polymerization, and aqueous polymerization, especially
  • a dispersant may be used during polymerization. Suitable dispersants include cationic and ampholytic surfactants such as sorbitan fatty acid esters and carboxymethyldimethylcetyl ammonium, anionic surfactants such as sodium salt of
  • polyoxyethylene dodecyl ether hydrogensulfate and polymeric dispersants such as cellulose esters, maleic polybutadiene, and guaternary salt of isopropyl methacrylate-dimethylaminoethyl methacrylate .
  • these dispersants may be used alone or in admixture of two or more.
  • the amount of the dispersant used is preferably 0.01 to 5 parts by weight per 100 parts by weight of the monomer charge.
  • an ionic surfactant is preferably used to disperse the monomers because it is also effective for
  • the polymerization initiator which can be used in the synthesis of the water-absorbing polymer may be selected depending on the polymerization mode. Examples of the
  • polymerization initiator include photo-decomposable initiators, thermally decomposable initiators, and redox initiators.
  • the amount of the polymerization initiator used is typically 0.001 to 10 mol%, preferably 0.001 to 5 mol% based on the monomer charge. Outside the range, an excess of the initiator may cause coloring or an offensive odor whereas a less amount may lead to an increased amount of residual monomers.
  • initiators include benzoin derivatives, benzyl derivatives, acetophenone derivatives, benzophenone derivatives and azo compounds. Examples of the thermally decomposable
  • polymerization initiators include persulfates such as sodium persulfate, potassium persulfate, and ammonium persulfate, peroxides such as hydrogen peroxide, t-butyl peroxide, and methyl ethyl ketone peroxide, azo compounds such as 2,2'- azobis ( 2-amidinopropane ) dihydrochloride and 2 , 2 ' -azobis [ 2- ( 2- imidazolin-2-yl ) propane ) dihydrochloride, and perchlorates such as potassium perchlorate and sodium perchlorate.
  • persulfates such as sodium persulfate, potassium persulfate, and ammonium persulfate
  • peroxides such as hydrogen peroxide, t-butyl peroxide, and methyl ethyl ketone peroxide
  • azo compounds such as 2,2'- azobis ( 2-amidinopropane ) dihydrochloride and 2
  • redox polymerization initiators examples include combinations of the above persulfates or peroxides with reducing compounds such as sulfites, L-ascorbic acid or ferrous salts. It is also possible to use the photo-decomposable initiator and thermally decomposable initiator in combination. Among others, the peroxides are preferred for attaining the objects of the invention .
  • the polymerization initiator may be added all at once or dropwise in the form of a solution. Divided portions of the initiator may be added in the course of reaction.
  • the polymerization results in a water-absorbing polymer in hydrous gel form, from which the desired water-absorbing resin may be recovered through post-treatment as desired, for example, washing for the purpose of removing any residual monomers and the initiator and drying.
  • any solvent such as water, acetone, alcohols, isoparaffin or volatile silicone may be used, although the solvent is not particularly limited.
  • the solvents may be used alone or in combination, or stepwise for carrying out washing.
  • the drying step is not particularly limited as long as it is conventional.
  • the preferred modes of drying include heat drying, hot air drying, vacuum drying, IR drying, microwave drying, freeze drying, spray drying, azeotropic drying using hydrophobic organic solvent, and high-humidity drying using hot steam. Hot air drying is more preferred.
  • the drying temperature and time are not particularly limited, drying at a high temperature above 150°C or for a long time of more than 5 hours may give rise to such problems as alternation of the resin, a drop of water absorption factor, and coloring.
  • the drying step may be followed by adjustment of particle size or narrowing of particle size distribution via surface crosslinking .
  • the particle size may be adjusted via polymerization, grinding, classification, granulation or fines recovery .
  • a surface crosslinking agent is used for the surface crosslinking.
  • Various organic and inorganic surface crosslinking agents are known, with the organic crosslinking agents being preferred.
  • Suitable crosslinking agents are dehydration esterification crosslinkers including polyhydric alcohols, epoxy compounds, polyfunctional amine compounds or condensates thereof with halo-epoxy compounds, oxazoline compounds, and (mono, di or poly) oxazolidinone compounds.
  • the silicone-crosslinked water-absorbing polymer may take any shape including spherical, mass, flake, plate, oval, fiber, irregular, a compact of consolidated particles and other shapes .
  • preferably has an average particle size of 100 nm to 1 mm, more preferably 500 nm to 500 urn, in a state prior to water
  • the silicone-crosslinked water-absorbing polymer functions to convert water solvent into gel.
  • gel means that the water-absorbing polymer absorbs a low-viscosity liguid so that the liguid may exhibit no or substantially no fluidity.
  • the water solvent may be water alone or a mixture of water and an organic solvent.
  • the organic solvent which is mixed with water is not particularly limited. Among others, amphiphatic solvents are preferred, for example, alcohols such as methanol, ethanol, propanol and 2-propanol, ketones such as acetone, and ethers such as tetrahydrofuran and dioxane .
  • Another embodiment of the invention is a cosmetic or skin external preparation comprising 0.01 to 60%, preferably from about 0.1 to 20%, more preferably from about 0.1 to 10% by weight (based on the total weight of the preparation) of the water-absorbing polymer defined above.
  • skin external preparation refers to any preparations externally administered to the skin, for example, cosmetics, skin external drugs, skin external
  • composition means a composition that is applied to keratin surfaces for purposes of treatment, beautification, or
  • the preparation or composition may take the form of lotion, gel, emulsion, cream, powder dispersion, powder dispersion emulsion, or the like. If the composition is in emulsion form, the emulsion may be water-in-oil or oil-in- water . In such case, the composition may comprise from about 2-99% water and from about 1-98% oil.
  • cosmetic composition for example, skin care products, foundation make-up cosmetics, and hair care cosmetics .
  • the amount of the polymers used initially was adjusted so that the final viscosity of the inventive and comparative formulas was essentially the same to facilitate comparative evaluation, e.g. ranged from 24,000 to 36,000 cps at 25° C.
  • compositions were tested for ability to optically improve the appearance of surfaces such as skin. 6 mil of each composition was applied to a microscope glass slide using a sguare applicator. The slides were dried in an air conditioned room at 25° C. The slides were photographed by a Canon PowerShot SD1400 IS camera where images were taken with the slides placed on a black background and the photograph taken at a 45° angle. Photographs were taken at 2 minutes, 2 hours and 24 hours. The results are show in Figures 1 and 2. The slides to which the invention composition was applied show an even film that provides a homogeneous light coverage that when visually inspected appears to blur the underlying glass slide. This is confirmed by application to skin with visual

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Abstract

A water-absorbing polymer obtained from (A) a phosphate-containing (meth)acrylic monomer and/or a salt thereof, (B) a monomer having one (meth)acrylic group within the molecule and/or a salt thereof other than component (A), and (C) an organopolysiloxane having a (meth)acrylic group at both ends and related compositions.

Description

WATER-ABSORBING (METH) ACRYLIC RESIN WITH OPTICAL EFFECTS, AND
RELATED COMPOSITIONS TECHNICAL FIELD
This invention relates to a water-absorbing (meth) acrylic resin, and a skin external preparation comprising the same suitable as cosmetics.
BACKGROUND ART
In the field of skin external preparations including cosmetics and skin external drugs, water-absorbing polymers are used in agueous cosmetics and agueous skin external drugs as a thickening/gelling agent for stabilizing the system. The water-absorbing polymers, however, have the drawback that they give an unpleasant slimy feel on use. This is because the polymer forms a gel network structure, which is stable and thus difficult to break down on use. Because of the unpleasant feel, sometimes the use of the cosmetic or drug must be interrupted. While it is desired to solve the problem, non- silicone water-absorbing polymers are unsatisfactory. See Patent Document 1.
To solve the drawback of an agueous skin external preparation using a water-absorbing polymer, Patent Documents 2 and 3 propose water-absorbing polymers having a silicone structure incorporated therein and cosmetic compositions comprising the same. These water-absorbing polymers still have problems including difficult control of three-dimensional structure due to cross linking of epoxy groups, and a change with time of water absorption capability.
Thus, it is desirable to create water absorbing polymers that provide optimal aesthetics as well as to provide other desirable cosmetic properties. If an ingredient used to formulate cosmetic products can multiple functions, this means fewer ingredients can be used in the formulation which reduces cost and the potential for adverse interactions between ingredients .
Particularly in cosmetic applications, it is very
desirable to create a film on skin that blurs skin defects such as lines, wrinkles, or minor skin imperfections. In addition to provide aesthetically pleasing thickening properties, when the same polymers provide other benefits such as optically improving the appearance of the skin surface this provides a further advantage .
Citation List Patent Document 1: JP-A 2000-327516
Patent Document 2: WO 2007/130412
Patent Document 3: WO 2007/130460 SUMMARY OF INVENTION
An object of the invention is to provide a cosmetic composition which exerts a high thickening effect in agueous solvents, eliminates poor spreading, moist and sticky feels, and is in paste form having thixotropy and giving a dry light feel.
Another object of the invention is to provide a cosmetic composition containing such polymer, which also provides optical effects on skin such as blurring the appearance of skin imperfections and providing the visual appearance of smooth, homogeneously colored skin.
The inventors have found that using a water-absorbing polymer defined herein, a skin external composition is
formulated that can attain the above objectives and other objects .
DESCRIPTION OF THE DRAWINGS
FIG. 1 shows photographs taken at two minutes of glass slides onto which the invention and comparative compositions were applied according to the procedure in Example 2.
FIG. 2 shows photographs taken at 2 hours of glass slides onto which the invention and comparative compositions were applied according to the procedure in Example 2.
DESCRIPTION OF PREFERRED EMBODIMENTS
Component (A) is a phosphate-containing (meth ) acrylic monomer. As long as a monomer has a phosphate group and a (meth ) acrylic group, the structure of a linkage for connecting these two groups is not particularly limited. Exemplary linkages include alkylene groups such as methylene, ethylene and propylene and oxyalkylene groups such as oxyethylene, oxypropylene, oxybutylene, oxypentamethylene and mixtures thereof. Of these, polyoxyalkylene groups are preferred, with polyoxypropylene being most preferred. The monomer is commercially available, for example, under the tradename of Sipomer PAM-200 from Rhodia.
Also included is a salt of a phosphate-containing
(meth ) acrylic monomer, which may be formed by adding an alkaline agueous solution to the phosphate-containing
(meth ) acrylic monomer. Component (B) is a monomer having one (meth) acrylic group within the molecule other than component (A) . Suitable
(meth ) acrylic monomers include (meth) acrylic acid, maleic acid, maleic anhydride, fumaric acid, crotonic acid, itaconic acid, 2- (meth) acrylamide-2-methylpropanesulfonic acid,
(meth) acryloxyalkanesulfonic acid, N-vinyl-2-pyrrolidone, N- vinylacetamide, (meth) acrylamide, N-isopropyl (meth) acrylate, N, -dimethyl (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, polyethylene glycol (meth) acrylate, and strearyl acrylate. A salt of the
(meth ) acrylic monomer may be formed by adding an alkaline agueous solution to the (meth) acrylic monomer.
The "salt" includes alkali metal salts such as sodium, potassium and lithium, alkaline earth metal salts such as calcium, magnesium and barium, and ammonium salts such as guaternary ammonium and guaternary alkyl ammonium. Inter alia, sodium salt is the most common and preferred. Neutralization treatment is preferably carried out at a temperature of 10 to 100°C, more preferably 20 to 90°C. Acrylic acid or polyacrylic acid following polymerization may be neutralized with a base. Neutralization prior to polymerization is preferred because it is time consuming to post-neutralize non-neutralized or low- neutralized (specifically a degree of neutralization of less than 30 mol%) polyacrylic acid following polymerization. The water-absorbing polymer of the invention preferably has a degree of neutralization of 0.01 to 100%, more preferably 1 to 90%, and even more preferably 20 to 80% based on the moles of acid groups in the polymer.
Component (C) is an organopolysiloxane having a
(meth ) acrylic group at both ends, represented by the general formula ( 1 ) .
R R1
(1)
R R
Figure imgf000007_0001
b
Herein R1 is each independently an aliphatic unsaturation-free monovalent hydrocarbon group having 1 to 8 carbon atoms. R2 is a group containing a polyoxyalkylene group having the general formula ( 2 ) :
R4(OC2H4)x(OC3H6)yOH
wherein R is each independently a divalent organic group having 2 to 15 carbon atoms, x and y each are an integer of 0 to 30, meeting 1 < x+y < 50. R3 is a substituent group having a (meth) acrylic group, a is an integer inclusive of 0 and b is an integer of at least 1.
Examples of the monovalent hydrocarbon group represented by R1 include alkyl groups such as methyl, ethyl and butyl, cycloalkyl groups such as cyclopentyl and cyclohexyl, aryl groups such as phenyl and tolyl, and aralkyl groups such as benzyl and phenethyl . Inter alia, alkyl groups of 1 to 4 carbon atoms and phenyl are preferred, with methyl being most preferred .
In formula (2), R4 is each independently selected from divalent organic groups having 2 to 15 carbon atoms, for example, -(CH2)2-, -(CH2)3-, -(CH2)4-, -CH2CH ( CH3 ) CH2-, -(CH2)8-, and -(CH2)n-. Inter alia, -(CH2)2-, -(CH2)3-, and -(CH2) - are preferred. Each of x and y is an integer of 0 to 30, meeting 1 < x+y < 50. Preferably each of x and y is an integer of 5 to 25, more preferably 10 to 20, and the sum of x+y is 10 to 45, more preferably 20 to 40.
In the water-absorbing polymer, the phosphate-containing
(meth ) acrylic monomer and/or salt (A) is preferably present in a content of 30 to 95% by weight. A polymer containing less than 30% by weight of monomer (A) may be less water absorptive whereas a polymer containing more than 95% by weight of monomer (A) may not become pasty after water absorption. The content of monomer (A) is more preferably 40 to 95% by weight, and even more preferably 50 to 80% by weight. Also preferably, the
(meth ) acrylic monomer and/or salt (B) is present in a content of 4 to 50% by weight, more preferably 15 to 50% by weight, and the organopolysiloxane (C) is present in a content of 0.01 to 20% by weight, more preferably 2 to 20% by weight.
The water-absorbing polymer may be prepared typically by radical polymerization reaction. Although the procedure is not particularly limited, the polymer may be prepared, for example, by diluting monomers (A) and (B) with a solvent, optionally adding an alkali, and polymerizing the monomers with siloxane (C) in the presence of (D) a radical initiator.
The radical polymerization mode for preparing the water- absorbing polymer is not particularly limited. While bulk polymerization and precipitation polymerization are acceptable, reverse phase suspension polymerization, spray or dropwise polymerization, and aqueous polymerization, especially
continuous aqueous polymerization are preferred for polymer performance and ease of polymerization control. A dispersant may be used during polymerization. Suitable dispersants include cationic and ampholytic surfactants such as sorbitan fatty acid esters and carboxymethyldimethylcetyl ammonium, anionic surfactants such as sodium salt of
polyoxyethylene dodecyl ether hydrogensulfate , and polymeric dispersants such as cellulose esters, maleic polybutadiene, and guaternary salt of isopropyl methacrylate-dimethylaminoethyl methacrylate . These dispersants may be used alone or in admixture of two or more. The amount of the dispersant used is preferably 0.01 to 5 parts by weight per 100 parts by weight of the monomer charge. In the case of reverse phase suspension polymerization, an ionic surfactant is preferably used to disperse the monomers because it is also effective for
preventing agglomeration of highly water-absorbing resin particles.
The polymerization initiator which can be used in the synthesis of the water-absorbing polymer may be selected depending on the polymerization mode. Examples of the
polymerization initiator include photo-decomposable initiators, thermally decomposable initiators, and redox initiators. The amount of the polymerization initiator used is typically 0.001 to 10 mol%, preferably 0.001 to 5 mol% based on the monomer charge. Outside the range, an excess of the initiator may cause coloring or an offensive odor whereas a less amount may lead to an increased amount of residual monomers.
Examples of the photo-decomposable polymerization
initiators include benzoin derivatives, benzyl derivatives, acetophenone derivatives, benzophenone derivatives and azo compounds. Examples of the thermally decomposable
polymerization initiators include persulfates such as sodium persulfate, potassium persulfate, and ammonium persulfate, peroxides such as hydrogen peroxide, t-butyl peroxide, and methyl ethyl ketone peroxide, azo compounds such as 2,2'- azobis ( 2-amidinopropane ) dihydrochloride and 2 , 2 ' -azobis [ 2- ( 2- imidazolin-2-yl ) propane ) dihydrochloride, and perchlorates such as potassium perchlorate and sodium perchlorate. Examples of the redox polymerization initiators include combinations of the above persulfates or peroxides with reducing compounds such as sulfites, L-ascorbic acid or ferrous salts. It is also possible to use the photo-decomposable initiator and thermally decomposable initiator in combination. Among others, the peroxides are preferred for attaining the objects of the invention .
The polymerization initiator may be added all at once or dropwise in the form of a solution. Divided portions of the initiator may be added in the course of reaction.
The polymerization results in a water-absorbing polymer in hydrous gel form, from which the desired water-absorbing resin may be recovered through post-treatment as desired, for example, washing for the purpose of removing any residual monomers and the initiator and drying. For the washing step, any solvent such as water, acetone, alcohols, isoparaffin or volatile silicone may be used, although the solvent is not particularly limited. The solvents may be used alone or in combination, or stepwise for carrying out washing.
The drying step is not particularly limited as long as it is conventional. The preferred modes of drying include heat drying, hot air drying, vacuum drying, IR drying, microwave drying, freeze drying, spray drying, azeotropic drying using hydrophobic organic solvent, and high-humidity drying using hot steam. Hot air drying is more preferred. Although the drying temperature and time are not particularly limited, drying at a high temperature above 150°C or for a long time of more than 5 hours may give rise to such problems as alternation of the resin, a drop of water absorption factor, and coloring.
If desired, the drying step may be followed by adjustment of particle size or narrowing of particle size distribution via surface crosslinking . The particle size may be adjusted via polymerization, grinding, classification, granulation or fines recovery .
For the surface crosslinking, a surface crosslinking agent is used. Various organic and inorganic surface crosslinking agents are known, with the organic crosslinking agents being preferred. Suitable crosslinking agents are dehydration esterification crosslinkers including polyhydric alcohols, epoxy compounds, polyfunctional amine compounds or condensates thereof with halo-epoxy compounds, oxazoline compounds, and (mono, di or poly) oxazolidinone compounds.
The silicone-crosslinked water-absorbing polymer may take any shape including spherical, mass, flake, plate, oval, fiber, irregular, a compact of consolidated particles and other shapes .
The silicone-crosslinked water-absorbing polymer
preferably has an average particle size of 100 nm to 1 mm, more preferably 500 nm to 500 urn, in a state prior to water
absorption (i.e., a loss of up to 5% on 150°C/3 hour heating) although the average particle size is not critical.
The silicone-crosslinked water-absorbing polymer functions to convert water solvent into gel. The term "gel" means that the water-absorbing polymer absorbs a low-viscosity liguid so that the liguid may exhibit no or substantially no fluidity. The water solvent may be water alone or a mixture of water and an organic solvent. The organic solvent which is mixed with water is not particularly limited. Among others, amphiphatic solvents are preferred, for example, alcohols such as methanol, ethanol, propanol and 2-propanol, ketones such as acetone, and ethers such as tetrahydrofuran and dioxane .
Another embodiment of the invention is a cosmetic or skin external preparation comprising 0.01 to 60%, preferably from about 0.1 to 20%, more preferably from about 0.1 to 10% by weight (based on the total weight of the preparation) of the water-absorbing polymer defined above.
As used herein, the "skin external preparation" refers to any preparations externally administered to the skin, for example, cosmetics, skin external drugs, skin external
disinfectants and bactericides . The term "cosmetic
composition" means a composition that is applied to keratin surfaces for purposes of treatment, beautification, or
coloration. Better results are obtained when the invention is applied to cosmetics where the feel on use has a large impact on the effect and skin external drugs reguiring long-term continuous administration, and especially cosmetics.
The preparation or composition may take the form of lotion, gel, emulsion, cream, powder dispersion, powder dispersion emulsion, or the like. If the composition is in emulsion form, the emulsion may be water-in-oil or oil-in- water . In such case, the composition may comprise from about 2-99% water and from about 1-98% oil.
Various types of cosmetic composition are included, for example, skin care products, foundation make-up cosmetics, and hair care cosmetics .
EXAMPLE
Examples are given below to illustrate the synthesis of water-absorbing polymers and cosmetic compositions using them, but the invention is not limited thereto.
Synthesis Example 1
A 1-L separable flask eguipped with a stirrer was charged with 24 g of methacrylic acid, 60 g of Sipomer PMA-200
(Rhodia) , and 100 g of deionized water. With stirring, 52 g of 25% sodium hydroxide agueous solution was added dropwise at 20- 30°C. To the solution, 12 g of a methacrylic-terminated siloxane having the following formula (3) was added. With stirring, nitrogen bubbling was continued for 30 minutes, whereupon 100 g of 4% potassium peroxydisulfate agueous solution was added at 25°C. Thereafter, the flask was heated at 60°C at which reaction was run for 10 hours. The resulting gel was washed with an excess of acetone/water mixture, filtered, dried in a vacuum dryer for 10 hours, and pulverized in a mill, yielding the desired water-absorbing polymer in white powder particle form.
Figure imgf000016_0001
Synthesis Example 2
A 1-L separable flask eguipped with a stirrer was charged with 24 g of methacrylic acid, 60 g of Sipomer PMA-200
(Rohdia) , and 110 g of deionized water. With stirring, 52 g of
25% sodium hydroxide agueous solution was added dropwise at 20-
30°C. To the solution, 6 g of a methacrylic-terminated siloxane having the formula (3) was added. With stirring, nitrogen bubbling was continued for 30 minutes, whereupon 50 g of 4% potassium peroxydisulfate agueous solution and 25 g of 4% sodium hydrogensulfite agueous solution were added at 25°C. Thereafter, the flask was heated at 50°C at which reaction was run for 5 hours . The resulting gel was washed three times with an excess of acetone/water mixture, filtered, dried in a vacuum dryer for 10 hours, and pulverized in a mill, yielding the desired water-absorbing polymer in white powder particle form. Example: Cosmetic composition A cosmetic composition containing the polymer of Example 1 was prepared along with comparative formulas, as set forth below .
Ingredient Invention Comparative Comparative Comparative
Formula Formula #1 Formula #2 Formula #3
Water QS100 QS100 QS100 QS100
Sodium acrylate 4.00
crosspolymer-11
Sodium Acrylate 0.30
crosspolymer-22
Butylene glycol 2.0 2.0 2.0 2.0
Sucrose 0.5 0.5 0.5 0.5
Sorbitol 0.35 0.35 0.35 0.35
Caprylyl glycol 0.20 0.20 0.20 0.20
Glucose 0.05 0.05 0.05 0.05
Disodium EDTA 0.05 0.05 0.05 0.05 Laminaria 0.02 0.02 0.02 0.02 digitata
extract
Sodium 0.75
polyacrylate3
Carbomer 0.30
Tromethane 0.30
Glycerin 15.00 15.00 15.00 15.00
1 Polymer of Example 1
2 Aqua Keep 10SH-NFC— Sodium Acrylate Crosspolymer-2. Kobo Products Inc.
3 Cosmedia SP - Sodium polyacrylate. Cognis Corporation
4 Carbopol 980— Carbomer— Momentive Performance Materials
The amount of the polymers used initially was adjusted so that the final viscosity of the inventive and comparative formulas was essentially the same to facilitate comparative evaluation, e.g. ranged from 24,000 to 36,000 cps at 25° C.
The compositions were tested for ability to optically improve the appearance of surfaces such as skin. 6 mil of each composition was applied to a microscope glass slide using a sguare applicator. The slides were dried in an air conditioned room at 25° C. The slides were photographed by a Canon PowerShot SD1400 IS camera where images were taken with the slides placed on a black background and the photograph taken at a 45° angle. Photographs were taken at 2 minutes, 2 hours and 24 hours. The results are show in Figures 1 and 2. The slides to which the invention composition was applied show an even film that provides a homogeneous light coverage that when visually inspected appears to blur the underlying glass slide. This is confirmed by application to skin with visual
observation .

Claims

CLAIMS :
1. A water-absorbing polymer obtained from (A) a phosphate containing (meth) acrylic monomer and/or a salt thereof, (B) monomer having one (meth) acrylic group within the molecule and/or a salt thereof other than component (A), and (C) an organopolysiloxane having a (meth) acrylic group at both ends represented by the general formula (1) :
Figure imgf000020_0001
wherein R1 is each independently an aliphatic unsaturation-f: monovalent hydrocarbon group having 1 to 8 carbon atoms,
R2 is a group containing a polyoxyalkylene group having the general formula (2) :
R4(OC2H4)x(OC3H6)yOH
wherein R4 is each independently a divalent organic group having 2 to 15 carbon atoms, x and y each are an integer of 0 to 30, meeting 1 < x+y < 50,
R3 is a substituent group having a (meth) acrylic group, a is an integer inclusive of 0 and b is an integer of at least 1.
2. The water-absorbing polymer of claim 1 wherein the phosphate-containing (meth) acrylic monomer and/or salt (A) is present in a content of 30 to 95% by weight.
3. The water-absorbing polymer of claim 1 or 2, obtained using 50 to 95% by weight of the phosphate-containing
(meth ) acrylic monomer and/or salt (A), 4 to 50% by weight of the (meth) acrylic monomer and/or salt (B), and 0.01 to 20% by weight of the organopolysiloxane (C).
4. A skin external preparation comprising 0.1 to 60% by weight of the water-absorbing polymer of claims 1.
5. A cosmetic composition comprising 0.1 to 60% by weight of the water-absorbing polymer of claim 3.
6. The cosmetic composition of claim 5 wherein the water absorbing polymer is sodium polyacrylate cros spolymer-1.
7. The cosmetic composition of claim 5 wherein the cosmetic is in the form of an emulsion.
8. The cosmetic composition of claim 7 wherein the emulsion is a water in oil emulsion.
9. The cosmetic composition of claim 7 wherein the emulsion is an oil in water emulsion.
10. The cosmetic composition of claim 5 which is a skin treatment cream or lotion.
11. The cosmetic composition of claim 5 which is a foundation makeup .
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