Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-01-08
1993-08-31
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
526210, 526222, 526319, C08F 1606
Patent
active
052409970
ABSTRACT:
Process for producing ethylene-vinyl ester copolymers using a polymerization solvent of a dialkyl sulfoxide (process X); process for producing ethylene-vinyl alcohol copolymer by liquid phase saponification using a solvent of a dialkyl sulfoxide (process Y); and process for producing shaped articles which comprises contacting the ethylene-vinyl alcohol copolymer obtained by the process Y, or that obtained by saponifying the ethylene-vinyl ester copolymer obtained by process X, to a non-solvent for ethylene-vinyl alcohol copolymer.
Ethylene-vinyl ester copolymers having a wide range of ethylene content and higher degree of polymerization than that with solution polymerization using methanol.
The rate of saponification is higher than that with single solvent system of lower alcohol.
Production cost is low, because production process of polymer is directly connected to that of shaped articles utilizing the polymer.
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"POVAL" (Revised Edition) published by Kobunshi Kankokai on Apr. 1, 1981. Partial translation only.
Aoyama Akimasa
Kitamura Takanori
Moritani Takeshi
Nakahara Fumio
Shimizu Katsumi
Kuraray Co. Ltd.
Reddick J. M.
Schofer Joseph L.
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