Patent US4430492A successfully refreshed from Google Patents.
US4430492A
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High-molecular, segmented, thermoplastically processable, aromatic polycarbonates containing co-condensed dimeric fatty acid esters, their preparation and their use
Assignee: Bayer AG
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Filing: 1980-08-28
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Granted: 1984-02-07
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Expires: 2000-08-28
Abstract
Abstract The present invention relates to polycarbonate compounds characterized in that dimeric fatty acid ester soft segments are co-condensed therein. The invention further relates to processes for preparation of these compounds and their use in films and molded articles.
Inventors
- 👤 Manfred Schreckenberg
- 👤 Hans-Heribert Burgdorfer
- 👤 Rolf Dhein
- 👤 Gottfried Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:37
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
125 words
In a two-phase interfacial process for preparing high-molecular weight, thermoplastically processable aromatic polycarbonates, the improvement comprising co-reacting dimeric saturated fatty acid esters characterized by hydroxyaryl carbonate end groups of the formula ##STR9## wherein --O--A--O-- is a bivalent diolate radical of an aliphatic dimeric saturated fatty acid ester having hydroxyl end groups and a number-average molecular weight of 1,000 and 15,000 X is a single bond, --CH 2 --, ##STR10## --O--, --S--, --SO 2 --, or ##STR11## and Y 1 to Y 4 , independently denote hydrogen, C 1 to C 4 alkyl or a halogen atom with diphenols, monophenolic chain stoppers and carbonic acid halides, said polycarbonates being characterized in that they contain between 5 and 70 weight percent of segments derived from said esters.
Claim 2
Dependent Claim
125 words
In a two-phase interfacial process for preparing high-molecular weight, thermoplastically processable aromatic polycarbonates, the improvement comprising co-reacting dimeric saturated fatty acid esters characterized by hydroxyaryl carbonate end groups of the formula ##STR9## wherein --O--A--O-- is a bivalent diolate radical of an aliphatic dimeric saturated fatty acid ester having hydroxyl end groups and a number-average molecular weight of 1,000 and 15,000 X is a single bond, --CH 2 --, ##STR10## --O--, --S--, --SO 2 --, or ##STR11## and Y 1 to Y 4 , independently denote hydrogen, C 1 to C 4 alkyl or a halogen atom with diphenols, monophenolic chain stoppers and carbonic acid halides, said polycarbonates being characterized in that they contain between 5 and 70 weight percent of segments derived from said esters.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said molecular weight is between 2,000 and 10,000.
Claim 4
Dependent Claim
16 words
The high-molecular weight, thermoplastically processable aromatic polycarbonate produced by the process of claim 1 or 2.
Claim 5
Dependent Claim
9 words
Packaging films comprising the polycarbonate compound of claim 3.
Claim 6
Dependent Claim
9 words
Shaped articles comprising the polycarbonate compound of claim 3.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein said polycarbonates contain between 20 and 65 percent by weight of said segments.
Claim 8
Dependent Claim
16 words
The process of claim 6 wherein said number average molecular weight is between 2000 and 10,000.
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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) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |