Hodogaya Chemical Co., Ltd.

Hideyuki Ishii

Haruo Watanabe

Hiroshi Satoh

Hiroshi Nakaoka

Shuichi Takeuchi

Kazuaki Okabe

Masami Suganami

Method for preparing polyether polyol copolymer

An industrially advantageous process described below has been established wherein tetrahydrofuran and a cyclic ether copolymerizable therewith are copolymerized by the use of a very small amount of a commercially available heteropolyacid as it is untreated, the heteropolyacid of the catalyst is recovered, recycled and reused in a simple way, and a high quality polyether substantially free from catalyst contaminants is obtained. A process for producing a polyether, comprising the steps of copolymerizing tetrahydrofuran and at least one cyclic ether copolymerizable therewith by the use of an untreated heteropolyacid as a catalyst in the presence of a hydroxy compound to form a reaction liquid, contacting the resulting reaction liquid with an anion exchange resin so that the heteropolyacid contained in the reaction liquid adsorb to the anion exchange resin to remove the heteropolyacid, desorbing the removed heteropolyacid from the anion exchange resin to reuse it as the catalyst, and reusing the anion exchange resin after the desorption as it is, thus to recycle and reuse both the catalyst and the anion exchange resin.

Process for producing polyether, and process for recycling and reusing

A polyurethane resin composition without handling trouble is obtained by a combination of a copolyether polyol obtained by copolymerization of tetrahydrofuran and a 3-alkyl tetrahydrofuran at a mixing molar ratio of 85/15-20/80, a polyisocyanate compound and an active hydrogen atom-containing compound. The 3-alkyl tetrahydrofuran is preferably 3-methyl tetrahydrofuran.

Polyurethane from a copolyether of tetrahydrofuran and 3-alkyl

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Yokohama, Japan

Hideyuki Ishii