Mending hair damage with polyelectrolyte complexes
View Patent ↗Polyelectrolyte complexes between anionic and cationic polymers are used to mend damaged hair fibers, especially damage exhibited by split ends. An improved test method designed for the assessment of the degree of split end repair is described which consists of tagging hair fibers and observing the repair process by stereomicroscopy.
1. A hair care composition for mending split ends comprising a polyelectrolyte complex between
(a) a cationic polyquaternium polymer and
(b) an anionic copolymer containing mono-, di- or tri-acid groups, or salts thereof, in a charge ratio of (a):(b) of 0.82 to 1.80;
wherein said polyelectrolyte complex has a microgel structure.
2. A hair care composition according to claim 1 wherein said charge ratio is 0.90 to 1.50.
3. A hair care composition according to claim 1 wherein said charge ratio is 1.
4. A hair care composition according to claim 1 wherein the particle size is 0.5 μm to 31 μm.
5. A hair care composition according to claim 4 wherein said particle size is 3 to 15 microns.
6. A hair care composition according to claim 1 which is a thin milky-white liquid.
7. A hair care composition according to claim 1 wherein the mole ratio of the quaternium unit of said cationic polyquaternium polymer to said anionic copolymer provides a charge ratio times n a /n c where n a is the total number of anionic groups in one monomer unit of the anionic copolymer and n c is the total number of quaternary groups in one monomer unit of the cationic polymer.
8. A hair care composition according to claim 1 wherein the weight ratio of said cationic quaternium polymer to said anionic copolymer is provided by a mole ratio times MWc times wt % of quaternary unit in cationic polymer divided by MWa times wt % of the acid unit in anionic polymer where MWc is the monomer molecular weight of the cationic polymer and MWa is the monomer molecular weight of the anionic polymer.
9. A hair care composition according to claim 1 wherein (a) is polyquaternium-6, 7, 10, 11, 22 or 28.
10. A hair care composition according to claim 1 wherein (a) is quaternized polysaccharide.
11. A hair care composition according to claim 9 wherein (a) is polyquaternium-28.
12. A hair care composition according to claim 9 wherein (b) is polyvinylmethyl/maleic acid (PVM/MA) copolymer.
13. A hair care composition according to claim 9 wherein (b) is a copolymer of vinylpyrrolidone/acrylates/lauryl methacrylate.
14. A hair care composition according to claim 12 wherein the mole ratio of the quaternium unit of (a):(b) is 1.39 to 3.06.
15. A hair care composition according to claim 13 wherein the mole ratio of said quaternium unit of (a):(b) is 0.82 to 1.80.
16. A hair care composition according to claim 12 wherein the mole ratio of the quaternium unit of (a):(b) is 1.50 to 2.55.
17. A hair care composition according to claim 13 wherein the mole ratio of said quaternium unit of and (a):(b) is 0.90 to 1.50.
18. A hair care composition according to claim 14 wherein the mole ratio of said quaternium unit of (a):(b) is 1.7.
19. A hair care composition according to claim 15 wherein the mole ratio of said quaternium unit of (a):(b) is 1.0.
20. A hair care composition according to claim 14 wherein the weight ratio of (a):(b) is 6.5 to 14.30.
21. A hair care composition according to claim 15 wherein the weight ratio of (a):(b) is 2.44 to 5.37.
22. A hair care composition according to claim 20 wherein the weight ratio of (a):(b) is 7.0 to 11.91.
23. A hair care composition according to claim 21 wherein the weight ratio of (a):(b) is 2.68 to 4.47.
24. A hair care composition according to claim 20 wherein the weight ratio of (a):(b) is 9.0.
25. A hair care composition according to claim 21 wherein the weight ratio of (a):(b) is 3.0.
26. A hair care composition according to claim 1 which has a mending efficacy before combing of at least 30%.
27. A hair care composition according to claim 26 wherein said mending efficacy is at least 50%.
28. A hair care composition according to claim 26 wherein said mending efficacy is at least 90%.
29. A hair care composition according to claim 1 which has a durability of mending after combing of at least 15%.
30. A hair care composition according to claim 29 wherein said durability is at least 25%.
31. A hair care composition according to claim 29 wherein said durability is at least 45%.
32. A hair care composition according to claim 1 which is a leave-in composition.
33. A hair care composition according to claim 32 which is a lotion, spray, cream, emulsion, mousse, or gel.
34. A hair care formulation according to claim 1 which includes said polyelectrolyte complex in an amount of about 0.1 to 10 wt % of said formulation.
35. A hair care formulation according to claim 34 including 0.5 to 5 wt % of said polyelectrolyte complex.
36. A hair care formulation according to claim 34 including 1 to 3 wt % of said polyelectrolyte complex.
37. A hair care formulation according to claim 34 wherein said polyelectrolyte complex comprises cationic and anionic polymers in a charge ratio of 0.9 to 1.5.
38. A method of mending split end fibers in hair tresses which comprises applying thereto the hair care composition of claim 1 .