JPS5589331A - Production of polyester - Google Patents
Production of polyesterInfo
- Publication number
- JPS5589331A JPS5589331A JP16327878A JP16327878A JPS5589331A JP S5589331 A JPS5589331 A JP S5589331A JP 16327878 A JP16327878 A JP 16327878A JP 16327878 A JP16327878 A JP 16327878A JP S5589331 A JPS5589331 A JP S5589331A
- Authority
- JP
- Japan
- Prior art keywords
- polyester
- heat
- oligomer
- aldehyde
- contents
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Polyesters Or Polycarbonates (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
PURPOSE: Polyester is heat-treated under an inert atmosphere at specific pressure and temperature to reduce the contents of aldehyde and oligomer.
CONSTITUTION: A polyester of more than 0.5 intrnsic viscosity, preferably polyethylene terephthalate with a bulk density of 0.6W0.9g/ml, is heat-treated under an inert gas, preferably nitrogen gas, atmosphere at a ratio of 15W300, preferably 20W200mmHg/hr.kg of the polyester in the temperature range from 180°C to the melting point, preferably from 190° to 240°C to reduce the contents of aldehyde to less than 10ppm and/or of oligomer to less than 0.5wt%. When the polyester is heat- treated, the change in intrinsic viscosity of the polyester is required to satisfy the equation ([η]0 and [η] are the intrinsic viscosities before and after the heat treatment).
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16327878A JPS5589331A (en) | 1978-12-27 | 1978-12-27 | Production of polyester |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16327878A JPS5589331A (en) | 1978-12-27 | 1978-12-27 | Production of polyester |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5589331A true JPS5589331A (en) | 1980-07-05 |
JPS6249295B2 JPS6249295B2 (en) | 1987-10-19 |
Family
ID=15770764
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16327878A Granted JPS5589331A (en) | 1978-12-27 | 1978-12-27 | Production of polyester |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5589331A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6703138B1 (en) | 1999-10-19 | 2004-03-09 | Toyo Boseki Kabushiki Kaisha | Laminated polyester film |
US20090137769A1 (en) | 2006-04-06 | 2009-05-28 | Shinya Konuma | Manufacturing method of polyethylene terephthalate |
EP2743287A1 (en) | 2004-05-31 | 2014-06-18 | Toray Industries, Inc. | Polyester resin composition, process for producing the same, and polyester film |
-
1978
- 1978-12-27 JP JP16327878A patent/JPS5589331A/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6703138B1 (en) | 1999-10-19 | 2004-03-09 | Toyo Boseki Kabushiki Kaisha | Laminated polyester film |
EP2743287A1 (en) | 2004-05-31 | 2014-06-18 | Toray Industries, Inc. | Polyester resin composition, process for producing the same, and polyester film |
US20090137769A1 (en) | 2006-04-06 | 2009-05-28 | Shinya Konuma | Manufacturing method of polyethylene terephthalate |
US8653232B2 (en) | 2006-04-06 | 2014-02-18 | Teijin Fibers Limited | Manufacturing method of polyethylene terephthalate |
Also Published As
Publication number | Publication date |
---|---|
JPS6249295B2 (en) | 1987-10-19 |
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