Cosmetic compositions of reactively blended copolymers

1. A cosmetic composition for application to an integument comprising, in a suitable cosmetic vehicle, a first phase polymer having pendant maleic anhydride functional groups and a second phase polymer having complementary reactive functional groups, wherein the first phase polymer and second phase polymer are reactively blended to form a two phase copolymer blend film that provides a durability benefit through an interfacial chemical reaction, wherein the second phase polymer is a polymer of the structure of II:

where R″ and R′″ are monomer units independently selected from any synthetic monomers; b is at least 2; a+b are such that the M w of the compound is between 500 and 1,000,000 Daltons; and X is a functional group chosen from either hydroxyl or amine.

2. The cosmetic composition of claim 1 , wherein the first phase polymer is a polymer of the structure of Formula I:

wherein R and R′ are monomer units independently selected from the group consisting of propylene, ethylene, styrene, methacrylate, ester, fluoropolymer, urethane, or any carbon monomer; b is at least 2; and a+b are such that the M w of the compound is between 500 and 1,000,000 Daltons.

3. The cosmetic composition of claim 2 , wherein a+b is such that the M w of the first phase polymer is between about 5,000 to about 100,000 Daltons.

4. The cosmetic composition of claim 3 , wherein a+b is such that the M w of the first phase polymer is between about 10,000 to about 50,000 Daltons.

5. The cosmetic composition of claim 2 , wherein R and R′ are different.

6. The cosmetic composition of claim 5 , wherein R is ethylene and R′ is propylene.

7. The cosmetic composition of claim 2 , wherein the ratio of R to R′ is about 40:60 to about 90:10.

8. The cosmetic composition of claim 7 , wherein the ratio is about 45:55 to about 75:25.

9. The cosmetic composition of claim 1 , wherein the maleic anhydride content of the first phase polymer is about 0.1-20% by weight.

10. The cosmetic composition of claim 9 , wherein the maleic anhydride content is about 1-10% by weight.

11. The cosmetic composition of claim 10 , wherein the maleic anhydride content is about 2-5% by weight.

12. The cosmetic composition of claim 1 , wherein the synthetic monomer is a siloxane.

13. The cosmetic composition of claim 1 , wherein complementary reactive functional group content of the second phase polymer is about 0.1-50% by weight of the second phase polymer.

14. The cosmetic composition of claim 13 , wherein the complementary reactive functional group content is about 1-20% by weight.

15. The cosmetic composition of claim 14 , wherein the complementary reactive functional group content is about 2-10% by weight.

16. The cosmetic composition of claim 1 , wherein the first phase polymer has less than about 10% crystallinity.

17. The composition according to claim 1 , wherein the composition is further comprised of additional ingredients selected from the group consisting of sunscreens, pigments, other film formers, thickeners, retinoids, waxes, emollients, long wearing particles/pigments, and compatible combinations thereof.

18. The cosmetic composition of claim 1 , wherein the durability benefit is selected from long wear, enhanced transfer resistance, enhanced shine, and/or prolonged exposure to actives.

19. The cosmetic composition of claim 1 , wherein the first phase polymer and second phase polymer are reactively blended prior to formulation.

20. A method for imparting a transfer-resistant film on a human integument comprising applying to said human integument an effective amount of the cosmetic composition of claim 1 .

21. The method of claim 20 , wherein the first phase polymer and second phase polymer are applied sequentially to the integument and the interfacial reaction occurs during application.

22. A kit comprising a lip product and a cosmetic composition of claim 1 .

23. The kit of claim 22 , wherein the first phase polymer and second phase polymer are separate components in the kit.