Patent US4835243A successfully refreshed from Google Patents.
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
•
Filing: 1988-06-13
•
Granted: 1989-05-30
•
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 04:06
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)
EP0072540A2
Cited
US4390681A
Cited
US4539386A
Cited
US4742149A
Cited
US4663422A
Cited
US4667011A
Cited
US4626584A
Cited
US4654412A
Cited
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 |