Pyrazole derivatives
US4102857A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1976 |
| Grant date | Jul 25, 1978 |
| Priority date | — |
| Expiry date | Aug 20, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S524/925
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
New ultraviolet light-absorbing compounds of the formula ##STR1## IN WHICH R.sub.1 is a substituent, e.g. alkyl, PA1 R.sub.2 is a substituent, e.g. alkyl, PA1 R.sub.3 is hydrogen or a substituent, e.g. alkyl, PA1 N is 1, 2 or 3, and PA1 R is an n-valent, optionally substituted benzene radical, or a 1- or 2-valent naphthalene or heterocyclic radical, which are producible by known processes. Such compounds are useful as stabilizers of organic materials, particularly plastics materials, against the degrading action of ultraviolet light and can be either applied as a coating on the organic material, or incorporated therein. Such compounds are useful as stabilizers of organic materials, particularly plastics materials, against the degrading action of ultraviolet light and can be either applied as a coating on the organic material, or incorporated therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.