(Co)polycarbonate and process for producing the same
US5494992A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1995 |
| Grant date | Feb 27, 1996 |
| Priority date | — |
| Expiry date | Jun 1, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A processes for producing a (co)polycarbonate having a low terminal hydroxyl group concentration and being excellent in heat resistance and hue, which comprises melt-polycondensing a dihydroxy compound with a carbonic diester in the presence of a catalyst for transesterification selected from the group consisting of a nitrogen-containing basic compound, an alkali metal borate and an alkaline earth metal borate and in the presence of a specific ester compound. A process for producing a linear, high-molecular weight (co)polycarbonate being excellent in heat resistance, hydrolysis resistance, hue and impact resistance which comprises melt-polycondensing a dihydroxy compound with a carbonic diester in the presence of a catalyst for transesterification selected from the group consisting of specific borates. A process for producing a (co)polycarbonate being excellent in heat resistance, hydrolysis resistance, hue and impact resistance which comprises melt-polycondensing a dihydroxy compound with a carbonic diester in the presence of boric acid and/or ammonium hydrogenphosphite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.