Process for making 5-thio-substituted benzotriazole UV absorbers
US5942626A · kind A · utility
7Cited by
15References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1996 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Apr 10, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/3475
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
2-(2-Hydroxyphenyl)-2H-benzotriazole UV-absorbers substituted at the 5-position of the benzo ring by a thioether group exhibit enhanced absorption in the near visible range (over 350 nm) allowing said compounds to be particularly effective in protecting polymer systems which are prone to degradation caused by actinic irradiation with wavelengths over 350 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.