JPS56112925A - Production of polyester - Google Patents
Production of polyesterInfo
- Publication number
- JPS56112925A JPS56112925A JP1595480A JP1595480A JPS56112925A JP S56112925 A JPS56112925 A JP S56112925A JP 1595480 A JP1595480 A JP 1595480A JP 1595480 A JP1595480 A JP 1595480A JP S56112925 A JPS56112925 A JP S56112925A
- Authority
- JP
- Japan
- Prior art keywords
- ethylene glycol
- solid
- contg
- inert gas
- polyester
- 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.)
- Pending
Links
Landscapes
- Polyesters Or Polycarbonates (AREA)
Abstract
PURPOSE: To obtain a polyester contg. a less amount of impurities such as aldehydes, by a method wherein polyethylene terephthalate having a specified property is subjected to a solid-phase polycondensation reaction of a temp. near its melting point while introducing an inert gas contg. ethylene glycol into the polymn. mixt.
CONSTITUTION: A particulate polyethylene terephthalate having a number-average polymn. degree of 90W120 is continuously supplied from a hopper 2 to a solid- phase polycondensation reactor 1 and subjected to a solid-phase polycondensation reaction at a temp. near the melting point of the starting polymer, while introducing an inert gas (e.g. nitrogen gas) contg. 20W200ppm ethylene glycol into the lower part of the polycondensation reactor 1, said ethylene glycol being produced from an ethylene glycol vapor generator 10. By using the inert gas contg. ethylene glycol, the polycondensation rate is reduced, the diffusion and the removal of acetaldehyde from the solid phase are promoted, and a polyester of superior quality and having a low content of aldehydes can be obtd.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1595480A JPS56112925A (en) | 1980-02-14 | 1980-02-14 | Production of polyester |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1595480A JPS56112925A (en) | 1980-02-14 | 1980-02-14 | Production of polyester |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56112925A true JPS56112925A (en) | 1981-09-05 |
Family
ID=11903132
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1595480A Pending JPS56112925A (en) | 1980-02-14 | 1980-02-14 | Production of polyester |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56112925A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006282697A (en) * | 2005-03-31 | 2006-10-19 | Mitsui Chemicals Inc | Copolymerization polyester |
JP2006335839A (en) * | 2005-06-01 | 2006-12-14 | Mitsui Chemicals Inc | Method for producing polyethylene terephthalate |
JP2012126763A (en) * | 2010-12-13 | 2012-07-05 | Toyobo Co Ltd | Method for producing polyester resin |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4916788A (en) * | 1972-06-03 | 1974-02-14 | ||
JPS5373288A (en) * | 1976-12-13 | 1978-06-29 | Teijin Ltd | Preparation of polyester pellets |
JPS54149793A (en) * | 1978-05-16 | 1979-11-24 | Celanese Corp | Preparation of polyethylene terephthalate suitable for drinking container |
-
1980
- 1980-02-14 JP JP1595480A patent/JPS56112925A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4916788A (en) * | 1972-06-03 | 1974-02-14 | ||
JPS5373288A (en) * | 1976-12-13 | 1978-06-29 | Teijin Ltd | Preparation of polyester pellets |
JPS54149793A (en) * | 1978-05-16 | 1979-11-24 | Celanese Corp | Preparation of polyethylene terephthalate suitable for drinking container |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006282697A (en) * | 2005-03-31 | 2006-10-19 | Mitsui Chemicals Inc | Copolymerization polyester |
JP2006335839A (en) * | 2005-06-01 | 2006-12-14 | Mitsui Chemicals Inc | Method for producing polyethylene terephthalate |
JP2012126763A (en) * | 2010-12-13 | 2012-07-05 | Toyobo Co Ltd | Method for producing polyester resin |
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