AZEOTROPIC BLEND OF PROPYL 2-HYDROXY THIOGLYCOLATE AND ETHYL 1-METHYL 2-HYDROXY THIOGLYCOLATE, PROCESS FOR ITS PREPARATION AND USE THEREOF IN A PROCESS FOR ACHIEVING A PERMANENT CHANGE IN HAIR WAVINESS

摘要

Azeotropic blend of thioglycolic acid 1,2-propanediol esters consisting of two thirds propyl 2-hydroxy thioglycolate of the formula (I): HS-CH2-COO-CH2-CHOH-CH3, and one third ethyl 1-methyl 2-hydroxy thioglycolate of the formula (II): HS-CH2-COO-CH(CH3)-CH2OH. Cosmetic use for achieving a permanent change in hair waviness.