US4613664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of polyester
Assignee: Toyobo Co Ltd
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Filing: 1985-12-26
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Granted: 1986-09-23
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Expires: 2005-12-26
Abstract
Abstract A process for production of polyester which comprises steps of: subjecting aromatic dicarboxylic acid or alkyl ester thereof, and glycol to ester exchange reaction or esterification, and subjecting the resulting mixture to polycondensation in a specific heating medium. The process can be carried out by using of small energy and a simple apparatus, and provides polyester having high quality.
Inventors
- 👤 Susumu Tate
- 👤 Hiroshi Hashimoto
- 👤 Akira Chiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:32
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/785; B; B01; B01J; B01J19/00; B01J19/18; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094; B01J2219/00121; B01J2219/00123; B01J2219/00162; B01J2219/00168; B01J2219/00182; B01J2219/18; B01J2219/185
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
A process for production of polyester which comprises steps of: subjecting aromatic dicarboxylic acid or alkyl ester thereof, and glycol to ester exchange reaction or esterification, and subjecting the resulting mixture to polycondensation in one or more of heating mediums selected from the group consisting of compounds having the following general formula (I) or (II) to give a polyester having an intrinsic viscosity of not less than 0.9: ##STR2## (wherein A l and A k are phenyl or C 5-20 cycloalkyl; A 2 to A k-l are, respectively, phenylene or C 5-20 cycloalkylene; R 1 and R 2 are C 1-20 alkyl; k is integer of 2-5; and m and n are integer of 0-5, provided that n+m≧1).
Claim 2
Dependent Claim
118 words
A process for production of polyester which comprises steps of: subjecting aromatic dicarboxylic acid or alkyl ester thereof, and glycol to ester exchange reaction or esterification, and subjecting the resulting mixture to polycondensation in one or more of heating mediums selected from the group consisting of compounds having the following general formula (I) or (II) to give a polyester having an intrinsic viscosity of not less than 0.9: ##STR2## (wherein A l and A k are phenyl or C 5-20 cycloalkyl; A 2 to A k-l are, respectively, phenylene or C 5-20 cycloalkylene; R 1 and R 2 are C 1-20 alkyl; k is integer of 2-5; and m and n are integer of 0-5, provided that n+m≧1).
Claim 3
Dependent Claim
20 words
A process according to claim 1, wherein the polycondensation reaction is carried out with a blowing of an inert gas.
Claim 4
Dependent Claim
27 words
A process according to claim 1, wherein the polycondensation reaction is carried out with adding of a fresh heating medium while discharging of the medium and by-product.
Claim 5
Dependent Claim
23 words
A process according to claim 1, wherein the polycondensation reaction is carried out in the presence of tungsten compounds in the heating medium.
Claim 6
Dependent Claim
20 words
A process according to claim 1, wherein the polycodensation reaction is carried out in solid phase within the heating medium.
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) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |