Patent US4603190A successfully refreshed from Google Patents.
US4603190A
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Thermotropic aromatic polyesters having high rigidity and toughness, process for the production thereof and the use thereof for the production of moulded articles, filaments, fibres and films
Assignee: Bayer AG
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Filing: 1984-07-03
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Granted: 1986-07-29
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Expires: 2004-07-03
Abstract
Abstract Thermotropic wholly aromatic polyesters containing condensed residues of p-hydroxybenzoic acid, isophthalic and optionally terephthalic acid, hydroquinone and 3.4'- and/or 4.4'-dihydroxy diphenyl, -diphenyl ether and/or -diphenyl sulphide, have excellent mechanical properties and are nevertheless not difficult to process.
Inventors
- 👤 Hans-Rudolf Dicke
- 👤 Manfred Schmidt
- 👤 Dieter Freitag
- 👤 Aziz El-Sayed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:40
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
Thermotropic, fully aromatic polyesters based on (a) p-hydroxybenzoic acid or substituted p-hydroxybenzoic acid substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy, C 6 -C 10 aryl or C 7 -C 12 alkaryl or halogen; (b) isophthalic acid or a mixture of isophthalic acid with at most 50% terephthalic acid; (c) hydroquinone; and (d) 3,4'-dihydroxy-diphenyl, 4,4'-dihydroxy-diphenyl, 3,4'-dihydroxy-diphenyl ether, 4,4'-dihydroxy-diphenyl ether, 3,4'-dihyroxy-diphenyl sulphide, 4,4'-dihydroxy-diphenyl sulphide, or mixtures thereof; in which the molar ratio of the condensed residues a/b is from 80:20 to 50:50, the molar ratio of the condensed residues b/c/d is from 20:10:10 to 50:48:2 and the molar ratio of the condensed residues b/(c+d) is from 0.95 to 1.05, and up to 50 mol-% of component (b) is terephthalic acid.
Claim 2
Dependent Claim
123 words
Thermotropic, fully aromatic polyesters based on (a) p-hydroxybenzoic acid or substituted p-hydroxybenzoic acid substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy, C 6 -C 10 aryl or C 7 -C 12 alkaryl or halogen; (b) isophthalic acid or a mixture of isophthalic acid with at most 50% terephthalic acid; (c) hydroquinone; and (d) 3,4'-dihydroxy-diphenyl, 4,4'-dihydroxy-diphenyl, 3,4'-dihydroxy-diphenyl ether, 4,4'-dihydroxy-diphenyl ether, 3,4'-dihyroxy-diphenyl sulphide, 4,4'-dihydroxy-diphenyl sulphide, or mixtures thereof; in which the molar ratio of the condensed residues a/b is from 80:20 to 50:50, the molar ratio of the condensed residues b/c/d is from 20:10:10 to 50:48:2 and the molar ratio of the condensed residues b/(c+d) is from 0.95 to 1.05, and up to 50 mol-% of component (b) is terephthalic acid.
Claim 3
Dependent Claim
35 words
Polyesters according to claim 1, characterised in that the molar ratio of the condensed residues a/b is from 70:30 to 55:45 and the molar ratio of the condensed residues b/c/d is from 30:33:8 to 45:41:4.
Claim 4
Dependent Claim
35 words
Polyesters according to claim 1, characterised in that the molar ratio of the condensed residues a/b is from 65:35 to 60:40 and the molar ratio of the condensed residues b/c/d is from 35:29:6 to 40:35:5.
Claim 5
Dependent Claim
25 words
Polyesters according to claim 1, characterised in that component (b) contains terephthalic acid in an amount of from 1 to 40 mol-%, based on (b).
Claim 6
Dependent Claim
25 words
Polyesters according to claim 1, characterised in that component (b) contains terephthalic acid in an amount of from 10 to 30 mol-%, based on (b).
Claim 7
Dependent Claim
20 words
Polyester articles in the form of moulded articles, filaments, fibers and films fabricated from the polyester according to claim 1.
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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) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |