JPS56112925A - Production of polyester - Google Patents

Production of polyester

Info

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
Application number
JP1595480A
Other languages
Japanese (ja)
Inventor
Hiroshi Yokoyama
Toshio Hisaie
Shunsuke Nokita
Tsuyoshi Sano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1595480A priority Critical patent/JPS56112925A/en
Publication of JPS56112925A publication Critical patent/JPS56112925A/en
Pending legal-status Critical Current

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
JP1595480A 1980-02-14 1980-02-14 Production of polyester Pending JPS56112925A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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