JPS57141418A - Stabilization of oxymethylene copolymer - Google Patents
Stabilization of oxymethylene copolymerInfo
- Publication number
- JPS57141418A JPS57141418A JP2720181A JP2720181A JPS57141418A JP S57141418 A JPS57141418 A JP S57141418A JP 2720181 A JP2720181 A JP 2720181A JP 2720181 A JP2720181 A JP 2720181A JP S57141418 A JPS57141418 A JP S57141418A
- Authority
- JP
- Japan
- Prior art keywords
- copolymer
- oxymethylene copolymer
- stabilization
- oxymethylene
- 200ppm
- 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
Abstract
PURPOSE: To form a color-free, stable, final product by a simple stabilization operation, by forming an oxymethylene copolymer having an unstable terminal- content ≤2wt% and heat-treating the copolymer.
CONSTITUTION: An oxymethylene copolymer containing 0.5W4mol% oxyalkylene units having adjacent carbon atoms and having a weight loss of below 2wt% when maintained in vacuo at 222°C for 50min is formed by bulk-polymerizing a small amount of ethylene oxide, diethylene glycol formal, etc., and trioxane at about 60W120°C to a conversion of about 81W94% in the presence of a catalyst (e.g., boron fluoride) in a self-cleaning type reactor. Next, the resulting copolymer (optionally in combination when below about 200ppm decomposition promotor, about 0.5W2wt% water, about 0.1W5wt% stabilizer, etc.) is kneaded, with heating, at a temperature of m.p. to 250°C for 0.1W10min by means of an extruder or the like.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2720181A JPS57141418A (en) | 1981-02-26 | 1981-02-26 | Stabilization of oxymethylene copolymer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2720181A JPS57141418A (en) | 1981-02-26 | 1981-02-26 | Stabilization of oxymethylene copolymer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57141418A true JPS57141418A (en) | 1982-09-01 |
Family
ID=12214473
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2720181A Pending JPS57141418A (en) | 1981-02-26 | 1981-02-26 | Stabilization of oxymethylene copolymer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57141418A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03128911A (en) * | 1989-10-16 | 1991-05-31 | Asahi Chem Ind Co Ltd | Stabilized polyacetal resin molding and its preparation |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50119096A (en) * | 1974-02-22 | 1975-09-18 | ||
JPS5285288A (en) * | 1976-01-01 | 1977-07-15 | Hoechst Ag | Thermoplastic composition |
-
1981
- 1981-02-26 JP JP2720181A patent/JPS57141418A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50119096A (en) * | 1974-02-22 | 1975-09-18 | ||
JPS5285288A (en) * | 1976-01-01 | 1977-07-15 | Hoechst Ag | Thermoplastic composition |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03128911A (en) * | 1989-10-16 | 1991-05-31 | Asahi Chem Ind Co Ltd | Stabilized polyacetal resin molding and its preparation |
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