Aromatic polycarbonates having polyfunctional UV screening units, method for making and use
US5556936A · kind A · utility
3Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1994 |
| Grant date | Sep 17, 1996 |
| Priority date | — |
| Expiry date | Nov 17, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31507
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
UV stabilized polycarbonates are provided having chemically combined polyhydric phenol benzotriazole carbonate units, such as 1,1-bis(4-hydroxyphenyl)-1-[4-hydroxy-3-(N-2-benzotriazole)phenyl]ethane carbonate units and methods for making. Incorporation of the polyhydric phenol benzotriazole functional units into the polycarbonate backbone can be achieved by redistribution or transesterification under melt polymerization conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.