US4536561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermotropic, wholly aromatic polyesters
Assignee: Bayer AG
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Filing: 1984-07-03
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Granted: 1985-08-20
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Expires: 2004-07-03
Abstract
Abstract Thermotropic, wholly aromatic polyesters containing condensed residues of (a) p-hydroxy benzoic acid, (b) 3-chloro-4-hydroxy benzoic acid, (c) isophthalic acid, (d) hydroquinone and (e) 3,4'- and/or 4,4'-dihydroxy-diphenyl, -diphenyl ether and/or -diphenyl sulphide have high rigidity and toughness and yet are easily processable.
Inventors
- 👤 Manfred Schmidt
- 👤 Hans-Rudolf Dicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:19
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6822; C08G63/02; C08G63/60; C08G63/605
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
185 words
A thermotropic, wholly aromatic polyester comprising condensed residues of monomeric units (a) through (e) wherein: (a) is p-hydroxyl-benzoic acid or p-hydroxyl-benzoic acid substituted in the nucleus by one or two C 1 -C 4 alkyl, C 1 -C 4 alkoxy C 6 -C 10 aryl or C 7 -C 12 alkylaryl groups, (b) is 3-chloro-4-hydroxy-benzoic acid, (c) is isophthalic acid, (d) is hydroquinone and (e) is selected from 3,4'-dihydroxy-diphenyl, 4,4'-dihydroxydiphenyl, 3,4'-dihydroxy-diphenyl ether, 4,4'-dihydroxy-diphenyl sulphide, and mixtures thereof, wherein said polyester contains the condensed residues of (a) at a concentration of from 25 to 65 mol %, (b) at a concentration of from 5 to 40 mol %, (c) at a concentration of from 30 to 50 mol %, and (d) at a concentration of from 1 to 10 mol %, each based on the sum of the condensed residues (a), (b) and (c), with the proviso that the sum of concentrations of (a) and (b) amounts to a minimum of 50 mol % and a maximum of 70 mol % and that the molar ratio of the condensed residues c/(d+e) is from 0.95 to 1.05.
Claim 2
Dependent Claim
185 words
A thermotropic, wholly aromatic polyester comprising condensed residues of monomeric units (a) through (e) wherein: (a) is p-hydroxyl-benzoic acid or p-hydroxyl-benzoic acid substituted in the nucleus by one or two C 1 -C 4 alkyl, C 1 -C 4 alkoxy C 6 -C 10 aryl or C 7 -C 12 alkylaryl groups, (b) is 3-chloro-4-hydroxy-benzoic acid, (c) is isophthalic acid, (d) is hydroquinone and (e) is selected from 3,4'-dihydroxy-diphenyl, 4,4'-dihydroxydiphenyl, 3,4'-dihydroxy-diphenyl ether, 4,4'-dihydroxy-diphenyl sulphide, and mixtures thereof, wherein said polyester contains the condensed residues of (a) at a concentration of from 25 to 65 mol %, (b) at a concentration of from 5 to 40 mol %, (c) at a concentration of from 30 to 50 mol %, and (d) at a concentration of from 1 to 10 mol %, each based on the sum of the condensed residues (a), (b) and (c), with the proviso that the sum of concentrations of (a) and (b) amounts to a minimum of 50 mol % and a maximum of 70 mol % and that the molar ratio of the condensed residues c/(d+e) is from 0.95 to 1.05.
Claim 3
Dependent Claim
56 words
A polyester according to claim 1 wherein the polyester contains the condensed residues of (a) at a concentration of from 35 to 47 mol % and the condensed residues of (b) at a concentration of from 15 to 27 mol %, based in each case on the sum of the condensed residues (a), (b) and (c).
Claim 4
Dependent Claim
20 words
Polyester articles in the form of moulded articles, filaments, fibers and films fabricated from the polyester according to claim 1.
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) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |