Patent ID: 11951198
Assignee: LIW PATENT COMPANY LIMITED BY GUARANTEE
Field: Pharmaceuticals (Chemistry)
Classification: CPC A | IPC A

Claim 0:
1. A method for treating hair comprising the following steps in order:
I) applying to the hair a composition (a) comprising an at least bi-functional Brønsted-base of the general formula X-R-Y, wherein the at least bi-functional Brønsted-base is selected from the group consisting of 4,7,10-trioxa-1,13-tridecanediamine, 4,9-dioxa-1,12-dodecanediamine, 1,11-diamino-3,6,9-trioxaundecane and mixtures thereof,
wherein the composition (a) has been mixed into a commercially available hair coloring or hair bleaching formulation prior to step (I); and
II) applying to the hair a composition (b) comprising an at least bi-functional organic acid capable of reacting with the amine groups of the hair, wherein the at least bi-functional organic acid is selected from the group consisting of oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, methylmalonic acid, methylsuccinic acid, 2-methylglutaric acid, aspartic acid, maleic acid, fumaric acid, itaconic acid, mesaconic acid, methylmaleic acid, phthalic acid, isophthalic acid, terephthalic acid, malic acid, ketomalonic acid, 4-ketopimelic acid, citric acid, isocitric acid, aconitic acid, propane-1,2,3-tricarboxylic acid, trimesic acid, methanetetracarboxylic acid, ethylenetetracarboxylic acid, meso-butane-1,2,3,4-tetracarboxylic acid, furantetracarboxylic acid and mixtures thereof;
wherein the composition (a) has a pH of >7, and the composition (b) has a pH of <7;
wherein the composition (a) is left on the hair for 1 to 45 minutes;
wherein the hair is rinsed and dried between the first application step (I) and the second application step (II); and
wherein hair breakage is reduced.