Polycarbonate polymer from tetra arylene triphenol
US4894432A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1988 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | Aug 3, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C39/15
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A triphenol type compound represented by the following formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 independently represent hydrogen, a halogen, a C.sub.1 -C.sub.5 alkyl group or a C.sub.1 -C.sub.5 alkoxy group. The triphenol type compound can be used, as a branching agent, for the production of a polycarbonate comprising (A) a carbonic acid component unit, (B) a divalent phenol component unit, and (C) a triphenol type compound component unit derived from the above-mentioned triphenol type compound. The triphenol type compound unit (C) is used in an amount of 0.01 to 10 mole %, based on the divalent phenol component unit (B) and the intrinsic viscosity [.eta.], determined at 25.degree. C. in methylene chloride, of the polycarbonate is 0.4 to 1.0 dl/g and the glass transition temperature (Tg), determined by a differential scanning type calorimeter is 150.degree. C. to 300.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.