JPS55145705A - Preparation of saponified ethylene-vinyl acetate copolymer with high whiteness - Google Patents
Preparation of saponified ethylene-vinyl acetate copolymer with high whitenessInfo
- Publication number
- JPS55145705A JPS55145705A JP5341179A JP5341179A JPS55145705A JP S55145705 A JPS55145705 A JP S55145705A JP 5341179 A JP5341179 A JP 5341179A JP 5341179 A JP5341179 A JP 5341179A JP S55145705 A JPS55145705 A JP S55145705A
- Authority
- JP
- Japan
- Prior art keywords
- vinyl acetate
- acetate copolymer
- alkali metal
- metal hydroxide
- ethylene
- 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 saponified ethylene-vinyl acetate copolymer with high whiteness uniformly saponified to its internal structure saponifying an ethylene-vinyl acetate copolymer in a heat-molten and kneaded condition by using a high-temp. aqueous alkali metal hydroxide solution.
CONSTITUTION: In a resin melting and kneading apparatus such as a heating roll, an extruder, a Banduary mixer or the like, an ethylene-vinyl acetate copolymer (EVA) having <70wt% vinyl acetate content is converted to a molten condition by heating and, thereafter, an aqueous alkali metal hydroxide solution of a concn. of from 20wt% to saturated concn. is added to advance saponification reaction in a molten and kneaded condition. As alkali metal hydroxide to be used, sodium hydroxide, potassium hydroxide or the like are mentioned and an amount of alkali metal hydroxide to be used is 1W1.2mol to 1mol of a vinyl acetate unit within EVA to be saponified correspondint to a desired saponification degree. The temp. during the saponification reaction, is pref. 100W200°C.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5341179A JPS55145705A (en) | 1979-05-02 | 1979-05-02 | Preparation of saponified ethylene-vinyl acetate copolymer with high whiteness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5341179A JPS55145705A (en) | 1979-05-02 | 1979-05-02 | Preparation of saponified ethylene-vinyl acetate copolymer with high whiteness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55145705A true JPS55145705A (en) | 1980-11-13 |
| JPS5748002B2 JPS5748002B2 (en) | 1982-10-13 |
Family
ID=12942077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5341179A Granted JPS55145705A (en) | 1979-05-02 | 1979-05-02 | Preparation of saponified ethylene-vinyl acetate copolymer with high whiteness |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55145705A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002161110A (en) * | 2000-11-28 | 2002-06-04 | Nippon Synthetic Chem Ind Co Ltd:The | Method for producing vinylalcohol-vinylamine copolymer |
-
1979
- 1979-05-02 JP JP5341179A patent/JPS55145705A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002161110A (en) * | 2000-11-28 | 2002-06-04 | Nippon Synthetic Chem Ind Co Ltd:The | Method for producing vinylalcohol-vinylamine copolymer |
| JP4640886B2 (en) * | 2000-11-28 | 2011-03-02 | 日本合成化学工業株式会社 | Method for producing vinyl alcohol-vinylamine copolymer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5748002B2 (en) | 1982-10-13 |
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