PURPOSE: To obtain gas permselective membrane having increased coefficient of gas transmission and high mechanical strength, by using a graft copolymer obtained from a cellulose derivative and single terminal reactive polyorganosiloxane.
CONSTITUTION: A cellulose derivative represented by formula is used wherein X1WX6 are selected from a group consisting of a hydrogen atom, a lower alkyl group, an acetyl group, a benzyl group, a vinylbenzyl group, a vinyl group, a hydroxyethyl group, a nitro group and an alkoxycarbonyl group, provided that at least one of X1WX6 is a hydrogen atom, a hydroxyethyl group, a vinyl group or a vinylbenzyl group. This compound must have a functional group such as a hydroxyl group or a vinyl group capable of reacting with the reactive terminal of single terminal reactive polyorganosiloxane. As the reactive terminal of single terminal reactive polyorganosiloxane, a hydrosilyl group, a halosilyl group or an epoxy group are designated. The graft copolymer of both compounds is formed into a membrane by a known method. A membrane having a thickness of about 0.05W100μm is pref. from the aspect of gas permeability and mechanical strength.
MATSUI KIYOHIDE
ONOZUKA JIYUNKO
UCHIKURA MASAKI
KIYOTA TOORU
AKIMOTO AKIRA
SAGAMI CHEM RES