Pyrazole derivatives
US3976658A · kind A · utility
7Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1974 |
| Grant date | Aug 24, 1976 |
| Priority date | — |
| Expiry date | Jul 8, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D231/26
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
New ultraviolet light-absorbing compounds of the formula ##SPC1## In which PA1 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 substituents, 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.