External preparation for skin containing a low-molecular-weight betaine
US6008246A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1997 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | Apr 16, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q19/002
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The purpose of the present invention is to provide the external preparation for skin sufficiently exhibits a moisturizing function and skin improvement function of a specific quaternary ammonium salt. Therefore, the external preparation for skin in accordance with the present invention comprising a quaternary ammonium salt which is shown in following constitutional formula (I), has an enhancer of moisturizing effect and skin roughness improvement effect of a quaternary ammonium salt selected from the group of vitamin E types, vitamin A derivatives, and alkyl denatured carboxyvinyl polymer. ##STR1## (wherein R.sup.1, R.sup.2, and R.sup.3 show alkyl groups having a carbon number from 1 to 6. A sum total of the carbon number of R.sup.1, R.sup.2, R.sup.3, and n is 8 or less. Each carbon number of R.sup.1, R.sup.2, and R.sup.3 can be same or different).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.