The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 1993
Filed:
Jan. 08, 1992
Hisamichi Yanai, Kurashiki, JP;
Takanori Kitamura, Kurashiki, JP;
Fumio Nakahara, Kurashiki, JP;
Katsumi Shimizu, Kurashiki, JP;
Akimasa Aoyama, Kurashiki, JP;
Takeshi Moritani, Kurashiki, JP;
Kuraray Co., Ltd., Kurashiki, JP;
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.