Product for improved permanent waving of hair and simultaneously coloring and permanently waving hair and method therefor
US5188639A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1992 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Mar 6, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/065
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
By combining a fluoroscein-based dye with a mercaptan based permanent waving composition and maintaining the pH of the resulting composition between about 2.5 and 4.5, a composition is achieved which simultaneously colors and permanently waves the hair. In addition, even if no coloring or dying of the hair is desired, the use of a colorless or complimentary fluoroscein-based dye with the mercaptan based permanent waving composition achieves a composition which imparts a substantially improved curl configuration to the hair as well as substantially longer lasting curls. Preferably, the mercaptan based permanent waving composition employed comprises an ester of either thioglycolic acid, thiolactic acid, or the amide of 2-aminoethanethiol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.