US4861857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermotropic polyesterimide from N-carboxyalkylene trimellitimide having excellent processibility, a process for their production and their use for the production of moldings, filaments, fibers and films
Assignee: Bayer AG
•
Filing: 1988-05-23
•
Granted: 1989-08-29
•
Expires: 2008-05-23
Abstract
Abstract Thermotropic polyesterimides based on N-(ω-carboxyalkylene)-trimellitic acid imides and diphenols are distinguished by superior mechanical properties while at the same time being easily processible.
Inventors
- 👤 Hans-Rytger Kricheldorf
- 👤 Ralf Pakull
- 👤 Volker Eckhardt
- 👤 Hans-Rudolf Dicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:36
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
Thermotropic polyesterimide which consists essentially of units corresponding to the following formulae ##STR4## with or without ##STR5## in which n is an integer of 3 to 12, Ar consists of 1,4-phenylene units or 4,4'-biphenylene units or mixtures thereof, up to 50 mol-% of these units being replaced by other C 6 -C 18 divalent aromatic radicals or mixtures thereof, in which 50 to 100 mol-% of the chain-extending bonds are coaxially or parallel opposed and 50 to 0 mol-% angled and which are unsubstituted or substituted by C 1 -C 4 alkoxy groups or halogen atoms, with the proviso that the molar ratio of III to I is 0 to 4.0 and the molar ratio of I to II is 0.95 to 1.05.
Claim 2
Dependent Claim
123 words
Thermotropic polyesterimide which consists essentially of units corresponding to the following formulae ##STR4## with or without ##STR5## in which n is an integer of 3 to 12, Ar consists of 1,4-phenylene units or 4,4'-biphenylene units or mixtures thereof, up to 50 mol-% of these units being replaced by other C 6 -C 18 divalent aromatic radicals or mixtures thereof, in which 50 to 100 mol-% of the chain-extending bonds are coaxially or parallel opposed and 50 to 0 mol-% angled and which are unsubstituted or substituted by C 1 -C 4 alkoxy groups or halogen atoms, with the proviso that the molar ratio of III to I is 0 to 4.0 and the molar ratio of I to II is 0.95 to 1.05.
Claim 3
Dependent Claim
20 words
Polyesterimide as claimed in claim 1, characterized in that the molar ratio of III to I is 0 to 3.0.
Claim 4
Dependent Claim
19 words
Polyesterimide as claimed in claim 1, characterized in that the ratio of III to I is 0.5 to 3.0.
Claim 5
Dependent Claim
17 words
Polyesterimide as claimed in claim 1, characterized in that n is an integer of 5 to 10.
Claim 6
Dependent Claim
20 words
Polyesterimide as claimed in claim 1, characterized in that Ar consists exclusively of 1,4-phenylene units, 4,4'-bisphenylene units or mixtures thereof.
Claim 7
Dependent Claim
15 words
A molding, filament, fiber or film produced from the polyesterimide as claimed in claim 1.
Claim 8
Dependent Claim
65 words
A process for the production of the polyesterimide claimed in claim 1 by reaction of the dicarboxylic acids derived from the units I with diphenols and hydroxycarboxylic acids derived from the units II and III, or reactive derivatives thereof, in the presence or absence of catalysts, chain terminators and branching agents at temperatures of from 150° to 330° C. and at atmospheric or reduced pressure.
Claim 9
Dependent Claim
17 words
A process as claimed in claim 7, characterized in that the reaction is followed by solid-phase post-condensation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |