Process for production of stabilized polycarbonate
US5668202A · kind A · utility
30Cited by
23References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 19, 1996 |
| Grant date | Sep 16, 1997 |
| Priority date | — |
| Expiry date | Jun 19, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S524/913
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the production of a stabilized polycarbonate which comprises melt-polycondensing an aromatic dihydroxy compound and a carbonic acid diester in the presence of a polycondensation catalyst and then, after the reaction mixture shows an intrinsic viscosity of at least 0.1, adding at least one stabilizer selected from the group consisting of specific compounds having a sulfonates group sulfonic acid anhydride group or a sulfate group in an amount of 0.01 to 500 ppm of a polycarbonate to be formed, to form a polycarbonate having a desired intrinsic viscosity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.