US4667011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermotropic aromatic polyesters having high mechanical properties and good processability, a process for their preparation, and their use for the production of mouldings, filaments, fibres and films
Assignee: Bayer AG
•
Filing: 1986-05-07
•
Granted: 1987-05-19
•
Expires: 2006-05-07
Abstract
Abstract Fully aromatic polyesters which contain 3-phenyl-4,4'-dihydroxybenzophenone radicals and/or 3-phenyl-3',4-dihydroxybenzophenone radicals as condensed units possess high mechanical properties but can still be processed without difficulties by a thermolastic method.
Inventors
- 👤 Volker Eckhardt
- 👤 Hans-Rudolf Dicke
- 👤 Klaus-Christian Paetz
- 👤 Aziz El Sayed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:46
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
187 words
Thermotropic aromatic polyesters having repeating units of the formulae ##STR3## wherein Ar 1 and Ar 2 are bivalent aromatic radicals having 6 to 18 C atoms, at least 90 mol% of the chain-extending bonds of which radicals are arranged coaxially or parallel in opposite directions, and at most 10 mol% of the chain-extending bonds of which radicals are arranged at angles, it being possible for these radicals to be substituted by 1 to 4 C 1 -C 4 -alkoxy groups and/or by 1 to 4 halogen atoms (preferably fluorine, chlorine or bromine), the molar ratio I/II being 30:70 to 85:15, and the molar ratio II/III being 0.95 to 1.05, characterized in that --O--Ar 3 --O-- consists of at least 50 mol% of radicals of the formula ##STR4## and at most 50 mol% of other bivalent aromatic radicals, the chain-extending bonds of which are arranged at angles or are arranged coaxially or parallel in opposite directions and the radicals having 6-18 C atoms, it being possible for these radicals to be substituted by 1 to 4 C 1 -C 4 -alkoxy groups and/or 1 to 4 halogen atoms.
Claim 2
Dependent Claim
187 words
Thermotropic aromatic polyesters having repeating units of the formulae ##STR3## wherein Ar 1 and Ar 2 are bivalent aromatic radicals having 6 to 18 C atoms, at least 90 mol% of the chain-extending bonds of which radicals are arranged coaxially or parallel in opposite directions, and at most 10 mol% of the chain-extending bonds of which radicals are arranged at angles, it being possible for these radicals to be substituted by 1 to 4 C 1 -C 4 -alkoxy groups and/or by 1 to 4 halogen atoms (preferably fluorine, chlorine or bromine), the molar ratio I/II being 30:70 to 85:15, and the molar ratio II/III being 0.95 to 1.05, characterized in that --O--Ar 3 --O-- consists of at least 50 mol% of radicals of the formula ##STR4## and at most 50 mol% of other bivalent aromatic radicals, the chain-extending bonds of which are arranged at angles or are arranged coaxially or parallel in opposite directions and the radicals having 6-18 C atoms, it being possible for these radicals to be substituted by 1 to 4 C 1 -C 4 -alkoxy groups and/or 1 to 4 halogen atoms.
Claim 3
Dependent Claim
30 words
Polyesters according to claim 1, characterized in that the radicals I and II exclusively represent aromatic units having chain-extending bonds which are parellel or coaxial and point in opposite directions.
Claim 4
Dependent Claim
18 words
Polyesters according to claims 1 and 2, characterized in that the repeating units III are exclusively 3-phenyl-4,4'-dihydoxybenzophenone radicals.
Claim 5
Dependent Claim
18 words
Polyesters according to claims 1 and 2, characterized in that the repeating units III are exclusively 3-phenyl-3',4-dihydroxybenzophenone radicals.
Claim 6
Dependent Claim
17 words
Polyesters according to claims 1-4, characterized in that Ar 1 and Ar 2 represent a 1,4-phenylene radical.
Claim 7
Dependent Claim
16 words
Polyesters according to claims 1-5, characterized in that the molar ratio I/II is 45:55 to 80:20.
Claim 8
Dependent Claim
16 words
Polyesters according to claims 1-5, characterized in that the molar ratio I/II is 60:40 to 78:22.
Claim 9
Dependent Claim
62 words
Process for the preparation of the polyesters according to claims 1-7 by reaction of the hydroxycarboxylic acids, dicarboxylic acids and diphenols with the radicals I to III or their reactive derivatives, which may also be prepared in situ, if appropriate in the presence of chain terminators, branching agents and catalysts, at temperatures from 160° to 350° C., if appropriate under reduced pressure.
Claim 10
Dependent Claim
16 words
Process according to claim 8, characterized in that it is followed by a subsequent solid-phase condensation.
Claim 11
Dependent Claim
17 words
Use of the polyesters according to claims 1-7 for the production of mouldings, filaments, fibres and films.
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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |