Process for preparing polymer bound UV stabilizers
US5096977A · kind A · utility
18Cited by
46References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1990 |
| Grant date | Mar 17, 1992 |
| Priority date | — |
| Expiry date | Sep 24, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Ultraviolet light stabilizers are chemically bound to anhydride containing polymers or copolymers. Polymeric stabilizers are prepared by the reaction of primary amino or hydrazido-substituted UV absorbers with some or all of the anhydride groups of the polymer or copolymer to form pendant stabilizer substituted imide or amic acid groups. The polymer bound stabilizers are not lost from the polymer system by volatilization, migration, or extraction, even at high temperature. The polymeric stabilizers of this invention may be used as they are or as concentrates to stabilize other polymer systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.