Patent · US Expired

Direct dyes having a quaternary center with a long aliphatic chain

US5486629A · kind A · utility

10Cited by

4References

1Claims

0Family size

Assignee

Clairol Incorporated · US

Inventors

Alexander Chan · Buffalo Grove, US
Yuh-Guo Pan · Stamford, US

Key dates

Filing date	Jul 28, 1994
Grant date	Jan 23, 1996
Priority date	—
Expiry date	Jul 28, 2014

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B69/001
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Direct dyes having a quaternary center with a long aliphatic chain, compositions containing those dyes, and the process of using them to dye hair are disclosed. These dyes have a higher affinity for hair and are more shampoo stable than conventional direct dyes, and produce pleasing uniform dyeing.

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