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US4621129A
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Process for producing melting-anisotropic, copolymerized polyester
Assignee: Mitsubishi Chemical Corp
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Filing: 1985-02-28
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Granted: 1986-11-04
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Expires: 2005-02-28
Abstract
Abstract PCT No. PCT/JP85/00094 Sec. 371 Date Oct. 31, 1985 Sec. 102(e) Date Oct. 31, 1985 PCT Filed Feb. 28, 1985 PCT Pub. No. WO85/03941 PCT Pub. Date Sep. 12, 1985.A process for producing a melting-anisotropic copolymerized polyester containing an alkylene terephthalate component, which comprises reacting a starting polyester composed of a dicarboxylic acid and a diol with an oxyaromatic carboxylic acid to form a copolymerized oligomer, then conducting acylating reaction by the addition of an acylating agent and further conducting polycondensating reduction thereby producing a melting-anisotropic, copolymerized polyester having a logarithmic viscosity of at least 0.2 dl/g. According to this process, a polyester of excellent physical property can be obtained at a good production efficiency.
Inventors
- 👤 Tamotsu Yoshimura
- 👤 Masahiko Nakamura
- 👤 Ken Honma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:05
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
A process for producing a melting-anisotropic, copolymerized polyester containing an alkylene terephthalate component, which comprises reacting 95 to 5 mol % of a starting polyester composed of a dicarboxylic acid and a diol having of recurring units represented by the general formula: ##STR6## where R 1 represents a divalent aromatic radical of 6 to 20 carbon atoms or a divalent cycloaliphatic radical of 4 to 20 carbon atoms, and R 2 represents a divalent aliphatic radical of 2 to 20 carbon atoms, with from 5 to 95 mol % of an oxyaromatic carboxylic acid represented by the general formula: ##STR7## where R 3 represents a hydrogen atom, a halogen atom, an alkyl or alkoxy group of 1 to 4 carbon atoms to form a copolymerized oligomer, then conducting acylating reaction by the addition of an acylating agent and, further conducting polycondensating reaction in order to increase the logarithmic viscosity thereby producing a copolymerized polyester having a logarithmic viscosity of at least 0.2 dl/g.
Claim 2
Dependent Claim
163 words
A process for producing a melting-anisotropic, copolymerized polyester containing an alkylene terephthalate component, which comprises reacting 95 to 5 mol % of a starting polyester composed of a dicarboxylic acid and a diol having of recurring units represented by the general formula: ##STR6## where R 1 represents a divalent aromatic radical of 6 to 20 carbon atoms or a divalent cycloaliphatic radical of 4 to 20 carbon atoms, and R 2 represents a divalent aliphatic radical of 2 to 20 carbon atoms, with from 5 to 95 mol % of an oxyaromatic carboxylic acid represented by the general formula: ##STR7## where R 3 represents a hydrogen atom, a halogen atom, an alkyl or alkoxy group of 1 to 4 carbon atoms to form a copolymerized oligomer, then conducting acylating reaction by the addition of an acylating agent and, further conducting polycondensating reaction in order to increase the logarithmic viscosity thereby producing a copolymerized polyester having a logarithmic viscosity of at least 0.2 dl/g.
Claim 3
Dependent Claim
27 words
The process for producing the melting-anisotropic, copolymerized polyester as defined in claim 1, wherein a polyalkylene terephthalate or the oligomer thereof is used as the starting polyester.
Claim 4
Dependent Claim
30 words
The process for producing the melting-anisotropic, copolymerized polyester as defined in claim 1, wherein para-oxybenzoic acid, 2-oxy-6-naphthoic acid, 1-oxy-5-naphthoic acid or 1-oxy-4-naphthoic acid is used as the oxyaromatic carboxylic acid.
Claim 5
Dependent Claim
22 words
The process for producing the melting-anisotropic, copolymerized polyester as defined in claim 1, wherein acetic anhydride is used as the acylating agent.
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) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |