Cosmetic compositions incorporating vinyl acetate-ethylene polymers
This invention is directed to an improvement in cosmetic compositions comprised of a cosmetically acceptable carrier and a polymer. The improvement comprises a vinyl acetate-ethylene polymer formed by aqueous emulsion polymerization and having crystalline ethylene segments which imparts a thermal melt temperature, heat of fusion and tensile storage modulus to the polymer. The vinyl acetate-ethylene polymers have: a crystalline melting point (T m ) ranging from 35 to 110° C. measured at a heat rate of 20° C./minute and, a tensile storage modulus of at least 1×10 5 dynes/cm 2 at 115° C. and measured at 6.28 rad/sec.
1 . In a cosmetic composition comprised of a cosmetically acceptable carrier and a polymer, the improvement which comprises:
a vinyl acetate-ethylene polymer formed by aqueous emulsion polymerization having crystalline ethylene segments, said vinyl acetate-ethylene polymer having a crystalline melting point (T m ) ranging from 35 to 110° C. measured at a heat rate of 20° C./minute and,
a tensile storage modulus of at least 1×10 5 dynes/cm 2 at 115° C. measured at 6.28 rad/sec.
2 . The cosmetic composition of claim 1 wherein the polymer is comprised of from 15 to 90% by weight of polymerized units of vinyl acetate and from about 10 to 85% by weight of polymerized units of ethylene based upon the total weight of the polymer.
3 . The cosmetic composition of claim 1 wherein the polymer is comprised of from 25 to 80% by weight of polymerized units of vinyl acetate and from about 20 to 75% by weight of polymerized units of ethylene based upon the total weight of the polymer.
4 . The cosmetic composition of claim 3 wherein the glass transition temperature is from +25° C. to about −35° C. as measured at a heat rate of 20° C. per minute.
5 . The cosmetic composition of claim 1 wherein the polymer is comprised of from 35 to 75% by weight of polymerized units of vinyl acetate and from about 25 to 65% by weight of polymerized units of ethylene based upon the total weight of the polymer.
6 . The cosmetic composition of claim 4 wherein polymerized carboxylic acid units are present in said polymer in an amount from about 0.2 to about 10% by weight of said polymer.
7 . The cosmetic composition of claim 5 wherein said polymer has a tensile storage modulus of at least 2×10 5 dynes/cm 2 at 115° C. and measured at 6.28 rad/sec.
8 . The cosmetic composition of claim 6 wherein the polymer is comprised of polymerized units of ethylene, vinyl acetate, and acrylic acid or N-methylolacrylamide.
9 . The cosmetic composition of claim 1 wherein the polymer is also comprised of polymerized units of a cationic monomer.
10 . The cosmetic composition of claim 1 wherein the crystalline heat of fusion of said polymer is from about 5 to 100 joules per gram as measured at a heat rate of 20° C. per minute.
11 . The cosmetic composition of claim 1 wherein the crystalline thermal melting point ranges from 50 to 90° C. as measured at a heat rate of 20° C. per minute.
12 . The cosmetic composition of claim 1 wherein the crystalline heat of fusion ranges from preferably 15 to 70 joules per gram as measured at a heat rate of 20° C. per minute.
13 . The cosmetic composition of claim 1 wherein said composition is a mascara composition and said cosmetically acceptable carrier contains a pigment.
14 . The cosmetic composition of claim 1 wherein said cosmetic composition comprises a fatty oil and water.
15 . The cosmetic composition of claim 1 wherein the composition is a sunscreen and contains a sunscreen agent.
16 . The cosmetic composition of claim 1 wherein the cosmetically acceptable carrier is designed as a hair spray formulation.