JPS5531830A - Preparation of polyester - Google Patents

Preparation of polyester

Info

Publication number
JPS5531830A
JPS5531830A JP10388778A JP10388778A JPS5531830A JP S5531830 A JPS5531830 A JP S5531830A JP 10388778 A JP10388778 A JP 10388778A JP 10388778 A JP10388778 A JP 10388778A JP S5531830 A JPS5531830 A JP S5531830A
Authority
JP
Japan
Prior art keywords
esterification
point
germanium compound
polyester
glycol
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
JP10388778A
Other languages
Japanese (ja)
Inventor
Satoshi Hashimoto
Tetsuo Miki
Takamasa Asano
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.)
Teijin Ltd
Original Assignee
Teijin 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 Teijin Ltd filed Critical Teijin Ltd
Priority to JP10388778A priority Critical patent/JPS5531830A/en
Publication of JPS5531830A publication Critical patent/JPS5531830A/en
Pending legal-status Critical Current

Links

Landscapes

  • Polyesters Or Polycarbonates (AREA)

Abstract

PURPOSE: To obtain a polyster suitable for blow-molded products, by adding a germanium compound to the reaction system at the point of a specific esterification % to prevent opacifying effect in thick part of molded product.
CONSTITUTION: A bifunctional carboxylic acid consisting mainly of terephthalic acid and a glycol consisting chiefly of ethylene glycol are subjected to direct esterification. At the point of 60W90% esterification, a germanium compound such as crystalline germanium dioxide, etc. is added in an amount of 0.001W0.1mol% based on the acid component, followed by further esterification by 5% or more, with overall esterification of 90W95%. Subsequently, a polycondensation is carried out to obtain the objective polyester.
COPYRIGHT: (C)1980,JPO&Japio
JP10388778A 1978-08-28 1978-08-28 Preparation of polyester Pending JPS5531830A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10388778A JPS5531830A (en) 1978-08-28 1978-08-28 Preparation of polyester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10388778A JPS5531830A (en) 1978-08-28 1978-08-28 Preparation of polyester

Publications (1)

Publication Number Publication Date
JPS5531830A true JPS5531830A (en) 1980-03-06

Family

ID=14365933

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10388778A Pending JPS5531830A (en) 1978-08-28 1978-08-28 Preparation of polyester

Country Status (1)

Country Link
JP (1) JPS5531830A (en)

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