Patent · US Expired

Agent and method for permanent shaping of hair and method for the production of N-alkylmercaptoacetamides

US6264932A · kind A · utility

1Cited by

3References

8Claims

0Family size

Assignee

Wella GmbH · DE

Inventors

Beate Dannecker · Darmstadt, DE
Gunther Lang · Reinheim, DE
Wolfgang Hanefeld · Marburg, DE
Heiko Walther · Marburg, DE

Key dates

Filing date	Mar 27, 1999
Grant date	Jul 24, 2001
Priority date	—
Expiry date	Mar 27, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C319/12
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

The aqueous ready-to-apply composition for permanent waving of hair has a pH of 4 to 8.5 and from 3 to 28% by weight of at least one N-alkylmercaptoacetamide of formula (I): ##STR1## wherein R represents a straight-chain alkyl group having from 3 to 6 carbon atoms or a straight-chain hydroxyalkyl group having from 3 to 6 carbon atoms; or a salt thereof; and at least one standard cosmetic additive ingredient, such as thickeners, wetting agents and emulsifiers, perfume oils, conditioners and buffer substances. The ready-to-apply composition can be made by mixing two or more components, one of which contains the N-alkylmercaptoacetamide. A method for permanent waving of hair using the ready-to-apply composition is also described. A process for making the N-alkylmercapto-acetamides includes reacting a suitable amine with methylthioglycolate under a protective gas atmosphere at temperatures that are not greater than 30.degree. C.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.