JPS5763326A - Preparation of polyester - Google Patents
Preparation of polyesterInfo
- Publication number
- JPS5763326A JPS5763326A JP13678880A JP13678880A JPS5763326A JP S5763326 A JPS5763326 A JP S5763326A JP 13678880 A JP13678880 A JP 13678880A JP 13678880 A JP13678880 A JP 13678880A JP S5763326 A JPS5763326 A JP S5763326A
- Authority
- JP
- Japan
- Prior art keywords
- bht
- glycol
- solution
- polyester
- polycondensation
- 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
Abstract
PURPOSE: To obtain a PET type polyester having improved brightness, transparency, and drawing properties without causing end down, etc., by adding a Ca compound as a solution at a stage of an esterification conversion in a specific range, followed by filtration so that coarse particles are removed.
CONSTITUTION: In preparing a polyester by reacting a dicarboxylic acid consisting essentially of tereththalic acid with a glycol consisting essentially of ethylene glycol to give a glycol ester of dicarboxylic acid and/or its low polymer[bis-β-hydroxydi- ethyl terephthalate(BHT)]which is subjected to polycondensation, at a stage before the beginning of the polycondensation, 60W300ppm (based on polymer) Ca compound (preferably Ca acetate) calculated as Ca as a solution of a glycol and/or water is added to the BHT having esterification conversion of 95W99% and BHT is filtered by a filter with a mesh ≤200μ, or the Ca solution is previously filtered and added to BHT.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13678880A JPS5763326A (en) | 1980-10-02 | 1980-10-02 | Preparation of polyester |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13678880A JPS5763326A (en) | 1980-10-02 | 1980-10-02 | Preparation of polyester |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5763326A true JPS5763326A (en) | 1982-04-16 |
JPH0124170B2 JPH0124170B2 (en) | 1989-05-10 |
Family
ID=15183525
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13678880A Granted JPS5763326A (en) | 1980-10-02 | 1980-10-02 | Preparation of polyester |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5763326A (en) |
-
1980
- 1980-10-02 JP JP13678880A patent/JPS5763326A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH0124170B2 (en) | 1989-05-10 |
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