US4841014A
Expired / Lapsed
US
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Melt-processable, thermotropic, fully aromatic polyesters
Assignee: Akzo NV
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Filing: 1988-06-23
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Granted: 1989-06-20
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Expires: 2008-06-23
Abstract
Abstract Thermotropic, fully aromatic polyesters, which consist essentially of (a) repeating units of the formula ##STR1## in proportions of 20 to 70 mole percent, (b) units of the formula ##STR2## in proportions of 10 to 40 mole percent, (c) one or both units of the formula ##STR3## wherein X=C═O or --O--, in proportions of 0 to 15 mole percent, (d) units of the formula(s) ##STR4## in proportions of 0 to 33 mole percent, and (e) units of the formula ##STR5## in proportions of 2 to 40 mole percent, have high Vicat B temperatures and can be thermoplastically processed at temperatures below 400° C.
Inventors
- 👤 Walter Brodowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:59
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605; C08G63/68; C08G63/682
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
91 words
A melt-processable, thermotropic, fully aromatic polyesters, consisting essentially of (a) repeating units of the formula ##STR12## in proportions of 20 to 70 mole percent, (b) units of the formula ##STR13## in proportions of 10 to 40 mole percent, (c) one or both, units of the formula ##STR14## wherein X=C═O or --O--, in proportions of 0 to 15 mole percent, (d) units of at least one of formulas ##STR15## in proportions of 0 to 33 mole percent, and (e) units of the formula ##STR16## in proportions of 2 to 40 mole percent.
Claim 2
Dependent Claim
91 words
A melt-processable, thermotropic, fully aromatic polyesters, consisting essentially of (a) repeating units of the formula ##STR12## in proportions of 20 to 70 mole percent, (b) units of the formula ##STR13## in proportions of 10 to 40 mole percent, (c) one or both, units of the formula ##STR14## wherein X=C═O or --O--, in proportions of 0 to 15 mole percent, (d) units of at least one of formulas ##STR15## in proportions of 0 to 33 mole percent, and (e) units of the formula ##STR16## in proportions of 2 to 40 mole percent.
Claim 3
Dependent Claim
84 words
A polyester according to claim 1, wherein said polyester consists of the condensed group (a) in proportions of 40 to 60 mole percent, of the condensed group (b) in proportions of 15 to 20 mole percent, of at least one of the condensed groups (c) in proportions of 4 to 6 mole percent, of at least one of the condensed groups (d) in proportions of 5 to 17 mole percent, and of the condensed group (e) in proportions of 3 to 15 mole percent.
Claim 4
Dependent Claim
52 words
A process for synthesis of the polyester according to claim 1, comprising reacting a C 1 to C 4 acyl derivative of (a) p-hydroxybenzoic acid, (b) at least one member selected from the group consisting of 4,4'-dihydroxydiphenyl and hydroquinone, and (c) 3,3'-dichloro-4,4'-dihydroxydiphenyl with terephthalic acid at temperatures of 250° to 385° C.
Claim 5
Dependent Claim
14 words
The process of claim 3, wherein resorcinol is also reacted with said terephthalic acid.
Claim 6
Dependent Claim
15 words
The process of claim 3, wherein isophthalic acid is also reacted with said acyl derivative.
Claim 7
Dependent Claim
14 words
The process of claim 3, wherein said reaction is carried out under reduced pressure.
Claim 8
Dependent Claim
20 words
The process of claim 3, wherein said reaction is carried out in the presence of at least one chain-terminating agent.
Claim 9
Dependent Claim
19 words
The process of claim 3, wherein said reaction is carried out in the presence of at least one catalyst.
Claim 10
Dependent Claim
17 words
The process of claim 3, wherein an acetate of a phenolic compound is reacted with terephthalic acid.
Claim 11
Dependent Claim
14 words
The process of claim 9, wherein said acetate is also reacted with isophthalic acid.
Claim 12
Dependent Claim
15 words
The process of claim 3, further comprising effecting a solid-phase post-condensation subsequent to said reaction.
Claim 13
Dependent Claim
21 words
The polyester of claim 1 wherein said polyester has a Vicat B softening temperature range of from 150° to 250° C.
Claim 14
Dependent Claim
36 words
A molding prepared from the polyester of claim 1 wherein said molding has a minimum notch impact toughness of 10 kn/m, a minimum flexural modulus of 10 GPa, and a minimum flexural strength of 100 MPa.
References Cited (Backward Citations)
DE2025971A1
Cited
US3637595A
Cited
US3786022A
Cited
US3980749A
Cited
US4065432A
Cited
US4238598A
Cited
US4256624A
Cited
US4265802A
Cited
EP0095938A2
Cited
US4433132A
Cited
EP0134956A1
Cited
US4536561A
Cited
EP0187734A2
Cited
US4617370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |