Process for permanently shaping hair
US4470423A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1982 |
| Grant date | Sep 11, 1984 |
| Priority date | — |
| Expiry date | Dec 13, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K8/46
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Multistage process for permanent shaping of hair, whereby the hair is at first treated with a liquid hair keratine reducing permanent shaping agent before and/or after rolling the hair onto rollers. This liquid, weak shaping effective permanent shaping medium is able to shape the hair in the area of the hair tips without damaging the hair tips during the reaction time. Subsequently, a consistent keratine reducing permanent shaping medium is applied to the rolled up hair which has a viscosity of 50 to 5000 m Pa.multidot.s, preferably 100 to 500 m Pa.multidot.s at a temperature of 30.degree. C. and which has a stronger shaping effectiveness with respect to the liquid permanent shaping medium. The consistent permanent shaping medium screens the hair to the outside and prevents the access of atmospheric oxygen, on the one hand, and the escaping of a volatile alkalization agent like, for example, ammonia, on the other hand. Furthermore, due to the higher shaping effectiveness of the consistent permanent shaping medium a good shaping of the beginning of the hair is obtained without the danger of an excess curling of the tips of the hair. After a sufficient reaction time, the hair is rins…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.