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US4627949A
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Process for the preparation of shaped articles of stabilized polycarbonate by the devolatilizing injection-moulding or devolatilizing extrusion process
Assignee: Bayer AG
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Filing: 1984-08-27
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Granted: 1986-12-09
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Expires: 2004-08-27
Abstract
Abstract The present invention relates to a process for the preparation of polycarbonate shaped articles from polycarbonates stabilized with phosphanes by the devolatilizing injection-moulding or devolatilizing extrusion process.
Inventors
- 👤 Rolf Dhein
- 👤 Helmut M. Meier
- 👤 Hans J. Meissner
- 👤 Klaus Kircher
- 👤 Udo Oels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:21
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/50; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/76; B29C48/03; B29K; B29K2069/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
118 words
Process for the production of polycarbonate shaped articles by the devolatilizing injection-moulding or devolatilizing extrusion process, wherein the thermoplastic polycarbonate composition contains 0.1 to 0.1% of a phosphane of the general formula (I) (R).sub.2 PR.sup.1 (I) wherein R is selected from the group consisting of unsubstituted C 6 -C 14 -aryl radicals, alkyl substituted C 6 -C 14 -aryl radicals and hydroxy substituted C 6 -C 14 -aryl radicals, and R 1 is selected from the group consisting of unsubstituted C 6 -C 14 -aryl radicals, unsubstituted C 1 -C 18 -alkyl radicals and substituted C 6 -C 14 -aryl and C 1 -C 18 -alkyl radicals wherein substitutes are any of hydroxy, alkyl-carboxyl, cyano or phenyl radicals.
Claim 2
Dependent Claim
118 words
Process for the production of polycarbonate shaped articles by the devolatilizing injection-moulding or devolatilizing extrusion process, wherein the thermoplastic polycarbonate composition contains 0.1 to 0.1% of a phosphane of the general formula (I) (R).sub.2 PR.sup.1 (I) wherein R is selected from the group consisting of unsubstituted C 6 -C 14 -aryl radicals, alkyl substituted C 6 -C 14 -aryl radicals and hydroxy substituted C 6 -C 14 -aryl radicals, and R 1 is selected from the group consisting of unsubstituted C 6 -C 14 -aryl radicals, unsubstituted C 1 -C 18 -alkyl radicals and substituted C 6 -C 14 -aryl and C 1 -C 18 -alkyl radicals wherein substitutes are any of hydroxy, alkyl-carboxyl, cyano or phenyl radicals.
Claim 3
Dependent Claim
18 words
Process according to claim 1 wherein the polycarbonate has an average molecular weight of between 10,000 and 100,000.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |