Discoloration-insusceptible polycarbonate composition
US5719254A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1996 |
| Grant date | Feb 17, 1998 |
| Priority date | — |
| Expiry date | Aug 30, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/1345
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a polycarbonate composition comprising (a) an aromatic dihydroxy compound/carbonic diester transesterification polycarbonate having terminal hydroxyl groups in a proportion of at least 20 mole %, based on the molar total of all terminal groups of the polycarbonate, and (b) a phenolic antioxidant in an amount satisfying the following formula (1): EQU 20.times.10.sup.5 M.ltoreq.X.ltoreq.20.times.10.sup.5 M+2,100(1) wherein X represents the amount of said phenolic antioxidant (ppm by weight), based on the weight of said polycarbonate, and M represents the amount of said terminal hydroxyl groups (mol/g-polycarbonate). The polycarbonate composition of the present invention has an advantage in that it is insusceptible to discoloration not only during production thereof and molding of the composition, but also when a molded article produced from the composition experiences high temperature atomosphere. The polycarbonate composition of the present invention can be advantageously used in the various fields where polycarbonates have conventionally been used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.