US4599395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermotropic, aromatic polyesters having good mechanical strength, containing sulfonic acid groups or metal sulfonate groups a process for the production thereof
Assignee: Bayer AG
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Filing: 1984-10-09
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Granted: 1986-07-08
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Expires: 2004-10-09
Abstract
Abstract Thermotropic fully-aromatic polyesters which contain sulphonic acid and/or metal sulphonate groups bound to the aromatic rings of the polyester, have improved mechanical properties.
Inventors
- 👤 Hans-Rudolf Dicke
- 👤 Manfred Schmidt
- 👤 Mark Witman
- 👤 Aziz El-Sayed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:59
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3809
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
A Thermotropic fully-aromatic polyester comprising co-condensed units of (a) aromatic dicarboxylic acids, (b) diphenols and (c) aromatic hydroxycarboxylic acids the mol ratio of radicals of co-condensed aromatic dicarboxylic acids to radicals of co-condensed diphenols being from 0.95 to 1.05 and the radicals of co-condensed aromatic hydroxycarboxylic acids amounting to up to 100 mol %, based on co-condensed radicals (a)+(c), characterised in that the polyesters contain from 0.02 to 30% by weight, based on polyester, of sulphonic acid and/or metal sulphonate groups, (calculated as sulphonic acid groups) which are bound to aromatic rings of the polyester.
Claim 2
Dependent Claim
95 words
A Thermotropic fully-aromatic polyester comprising co-condensed units of (a) aromatic dicarboxylic acids, (b) diphenols and (c) aromatic hydroxycarboxylic acids the mol ratio of radicals of co-condensed aromatic dicarboxylic acids to radicals of co-condensed diphenols being from 0.95 to 1.05 and the radicals of co-condensed aromatic hydroxycarboxylic acids amounting to up to 100 mol %, based on co-condensed radicals (a)+(c), characterised in that the polyesters contain from 0.02 to 30% by weight, based on polyester, of sulphonic acid and/or metal sulphonate groups, (calculated as sulphonic acid groups) which are bound to aromatic rings of the polyester.
Claim 3
Dependent Claim
30 words
A polyester according to claim 1, characterised in that it contains from 30 to 80 mol %, based on co-condensed radicals (a)+(c), of a radical of co-condensed aromatic hydroxycarboxylic acids.
Claim 4
Dependent Claim
31 words
A polyester according to claim 1 or 2, characterised in that it contains from 50 to 70 mol %, based on co-condensed radicals (a)+(c), of radicals of co-condensed radicals hydroxycarboxylic acids.
Claim 5
Dependent Claim
39 words
A polyester according to claim 1 or 2, characterised in that it contains from 0.1 to 15% by weight, based on the polyester, of sulphonic acid and/or metal sulphonate groups which are bound to aromatic rings of the polyester.
Claim 6
Dependent Claim
40 words
A polyester according to claim 1 or 2 characterised in that it contains from 0.2 to 5% by weight, based on the polyester, of sulphonic acid and/or metal sulphonate groups which are bound to the aromatic rings of the polyester.
Claim 7
Dependent Claim
17 words
A polyester according to claims 1 or 2 in the form of mouldings, filaments, fibres and films.
Claim 8
Dependent Claim
70 words
A process for the production of thermotropic, fully-aromatic polyesters which comprises reacting (a) aromatic dicarboxylic acids, or a mixture thereof with aromatic hydroxycarboxylic acids, and (b) diphenols wherein at least one of said aromatic dicarboxylic acids, diphenols or hydroxycarboxylic acids is substituted by from 1 to 3 sulphonic acid, metal sulphonate groups or both per molecule, in the presence of catalysts at a temperature of from 160° to 370° C.
Claim 9
Dependent Claim
70 words
A process for the production of thermotropic, fully-aromatic polyesters which comprises reacting (a) aromatic dicarboxylic acids, or a mixture thereof with aromatic hydroxycarboxylic acids, and (b) diphenols wherein at least one of said aromatic dicarboxylic acids, diphenols or hydroxycarboxylic acids is substituted by from 1 to 3 sulphonic acid, metal sulphonate groups or both per molecule, in the presence of catalysts at a temperature of from 160° to 370° C.
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) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |