Aminoan thraquinone dyes having a quaternary center with a long aliphatic chain
US5314505A · kind A · utility
8Cited by
9References
8Claims
0Family size
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Key dates
| Filing date | Sep 1, 1992 |
| Grant date | May 24, 1994 |
| Priority date | — |
| Expiry date | Sep 1, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/10
- WIPO fieldPharmaceuticals
- 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.