02.25.22
US 11,213,468 B2 (Sabine Wagner); LIW Patent Company Limited By Guarantee, Dublin, Ireland, has patented a method for reducing hair breakage, with active ingredients configured to react with the amine groups and the carboxylic acid groups of the hair.
The method is comprised of applying to the hair a first formulation which comprises 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, and wherein the at least bi-functional Brønsted-base of the general formula X—R—Y of the first formulation reacts with the carboxylic acid groups of the hair and provides further crosslinks of hair proteins; and applying a second formulation containing 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 maleic acid, itaconic acid, and mixtures of maleic acid and itaconic acid, wherein the at least bi-functional organic acid of the second formulation reacts with the amino groups of the hair and the at least bi-functional Brønsted-base reacts with the carboxylic acid groups of the hair.
The first formulation has a pH of greater than 7 and the second formulation has a pH of less than seven.
The method is comprised of applying to the hair a first formulation which comprises 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, and wherein the at least bi-functional Brønsted-base of the general formula X—R—Y of the first formulation reacts with the carboxylic acid groups of the hair and provides further crosslinks of hair proteins; and applying a second formulation containing 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 maleic acid, itaconic acid, and mixtures of maleic acid and itaconic acid, wherein the at least bi-functional organic acid of the second formulation reacts with the amino groups of the hair and the at least bi-functional Brønsted-base reacts with the carboxylic acid groups of the hair.
The first formulation has a pH of greater than 7 and the second formulation has a pH of less than seven.