US4835243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermotropic aromatic polymers with high elongation at break, processes for their preparation and their use for the production of moulded articles, filaments, fibres and films
Assignee: Bayer AG
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Filing: 1988-06-13
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Granted: 1989-05-30
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Expires: 2008-06-13
Abstract
Abstract Thermotropic, fully aromatic polyesters based on p-hydroxybenzoic acid, aromatic dicarboxylic acid and diphenol in which the dicarboxylic acid groups consist at least in part of 3,3'-diphenyldicarboxylic acid groups have excellent mechanical properties, in particular excellent elongation at break.
Inventors
- 👤 Volker Eckhardt
- 👤 Hans-Rudolf Dicke
- 👤 Erich Hammerschmidt
- 👤 Ludwig Bottenbruch
- 👤 Frank Kleiner
- 👤 Heinz-Ulrich Blank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:48
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3809
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
Thermotropic, fully aromatic polyester containing recurrent units corresponding to the following formulae: ##STR2## wherein Ar consists of 0 to 100 mol-% of 1,4-phenylene groups and 100 to 0 mol-% of other bivalent aromatic groups which have from 6 to 18 carbon atoms and in which from 50 to 100 mol-% of the chain lengthening bonds are coaxial or arranged parallel in opposite directions and from 50 to 0 mol-% are bent at an angle and are unsubstituted or substituted with C 1 -C 4 -alkoxy groups or halogen atoms, under the condition that the molar ratio of I/II is from 0.1 to 4.0 and the molar ratio of II/III is from 0.95 to 1.05.
Claim 2
Dependent Claim
114 words
Thermotropic, fully aromatic polyester containing recurrent units corresponding to the following formulae: ##STR2## wherein Ar consists of 0 to 100 mol-% of 1,4-phenylene groups and 100 to 0 mol-% of other bivalent aromatic groups which have from 6 to 18 carbon atoms and in which from 50 to 100 mol-% of the chain lengthening bonds are coaxial or arranged parallel in opposite directions and from 50 to 0 mol-% are bent at an angle and are unsubstituted or substituted with C 1 -C 4 -alkoxy groups or halogen atoms, under the condition that the molar ratio of I/II is from 0.1 to 4.0 and the molar ratio of II/III is from 0.95 to 1.05.
Claim 3
Dependent Claim
18 words
Polyester according to claim 1, characterised in that the molar ratio of I/II is from 0.5 to 3.0.
Claim 4
Dependent Claim
18 words
Polyester according to claim 1 characterised in that the molar ratio of I/II is from 0.75 to 1.5.
Claim 5
Dependent Claim
89 words
Polyester according to claim 1 characterised in that from 50 to 80 mol-% of Ar consists of a 1,4-phenylene group and from 50 to 20 mol-% of Ar consists of other bivalent aromatic groups which have from 6 to 18 carbon atoms and in which from 50 to 100 mol-% of the chain lengthening bonds are coaxial or arranged parallel in opposite directions and from 50 to 0 mol-% are bent at an angle and are unsubstituted or substituted with C 1 -C 4 -alkoxy groups or halogen atoms.
Claim 6
Dependent Claim
17 words
Polyester according to claim 1 characterised in that Ar consists of 1,4-phenylene groups, 4,4'-diphenylene groups, or both.
Claim 7
Dependent Claim
28 words
Polyester according to claim 1 characterised in that Ar consists of a mixture of 1,4-phenylene groups and 4,4'-diphenylene groups in a molar ratio of from 2/1 to 1/2.
Claim 8
Dependent Claim
17 words
Moulded article, filament, fiber, or film which comprises the thermotropic, fully aromatic polyester according to claim 1.
References Cited (Backward Citations)
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US4390681A
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US4539386A
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US4742149A
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US4663422A
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US4667011A
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US4626584A
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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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |