US4600764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermotropic aromatic polyesters with good rigidity and toughness, process for the production thereof and the use thereof for the production of mouldings, filaments fibres and films
Assignee: Bayer AG
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Filing: 1985-04-15
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Granted: 1986-07-15
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Expires: 2005-04-15
Abstract
Abstract Thermotropic fully-aromatic polyesters which contain radicals of 3,4'- and/or 4,4'-dihydroxybenzophenone in addition to radicals of p-hydroxybenzoic acid, iso- and optionally terephthalic acid, hydroquinone and/or 4,4'-dihydroxydiphenyl, have good rigidity and toughness and yet are easily processible.
Inventors
- 👤 Hans-Rudolf Dicke
- 👤 Ludwig Bottenbruch
- 👤 Dieter Freitag
- 👤 Aziz E. Sayed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:31
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
Thermotropic fully-aromatic polyester comprising co-condensed units of (a) 50 to 80 mol % p-hydroxybenzoic acid, or p-hydroxybenzoic acid substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy, C 6 -C 10 aryl, C 7 -C 12 alkylaryl or halogen, (b) isophthalic acid or a mixture of isophthalic acid and terephthalic acid, (c) 15 to 48 mol % hydroquinone, 4,4'-dihydroxydiphenyl, or both and (d) 2 to 30 mol % 3,4'-dihydroxybenzophenone, 4,4'-dihydroxybenzophenone, or both wherein the amounts of (a), (c) and (d) are based on the sum of the condensed units (a), (c) and (d) with the mol % of (b) determined by the ratio of the condensed units b/(c+d) which is from 0.95 to 1.05 and the proportion of terephthalic acid units based on the total of units (b) being at most 30 mol %.
Claim 2
Dependent Claim
137 words
Thermotropic fully-aromatic polyester comprising co-condensed units of (a) 50 to 80 mol % p-hydroxybenzoic acid, or p-hydroxybenzoic acid substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy, C 6 -C 10 aryl, C 7 -C 12 alkylaryl or halogen, (b) isophthalic acid or a mixture of isophthalic acid and terephthalic acid, (c) 15 to 48 mol % hydroquinone, 4,4'-dihydroxydiphenyl, or both and (d) 2 to 30 mol % 3,4'-dihydroxybenzophenone, 4,4'-dihydroxybenzophenone, or both wherein the amounts of (a), (c) and (d) are based on the sum of the condensed units (a), (c) and (d) with the mol % of (b) determined by the ratio of the condensed units b/(c+d) which is from 0.95 to 1.05 and the proportion of terephthalic acid units based on the total of units (b) being at most 30 mol %.
Claim 3
Dependent Claim
65 words
Polyesters according to claim 1, characterised in that they contain the condensed radicals (a) in a concentration of from 55 to 70 mol%, the condensed radicals (c) in a concentration of from 20 to 41 mol%, and the condensed radicals (d) in a concentration of from 4 to 25 mol%, in each cased based on the sum of the condensed radicals (a), (c) and (d).
Claim 4
Dependent Claim
65 words
Polyesters according to claim 1, characterised in that they contain the condensed radicals (a) in a concentration of from 60 to 66 mol%, the condensed radicals (c) in a concentration of from 20 to 35 mol%, and the condensed radicals (d) in a concentration of from 5 to 20 mol%, in each case based on the sum of the condensed radicals (a), (c) and (d).
Claim 5
Dependent Claim
37 words
Process for the production of the polyesters according to claim 1 by reacting the reactive derivatives of components (a) to (d), which may also be produced in situ, at a temperature of from 160° to 370° C.
Claim 6
Dependent Claim
15 words
Process according to claim 4, characterised in that solid phase post-condensation is subsequently carried out.
Claim 7
Dependent Claim
13 words
Moldings, filaments, fibers and films produced from the polyester according to claim 1.
References Cited (Backward Citations)
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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) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |