PURPOSE: To obtain the title copolymer film suitable for a selectively premeable film, particularly an artificial liver, having improved hea resistance, by forming a stock solution containing ethylene-vinyl alcohol copolymer into a film by wet process, which are crosslinked.
CONSTITUTION: A stock solution containing 10W50 wt. % of ethylene-vinyl alcohol (EVA) is formed into a film by wet process, which is crosslinked to have a small in diomethyl sulfoxide of 60W95%. An EVA copolymer having 5W30 mole % of ethylene, a saponification degree of 85W100 mole% based on a vinyl alcohol unit, and a viscosity (measured by using 3 wt. % dimethyl sulfoxide solution at 30°C with Brookfield viscometer) by preferably 1.0W50 centipoise may be cited as the EVA copolymer. Ethylene content of not more than 5 mole % makes machanical properties in wet state insufficient and increases an eluted material and ethylene content of not less than 30 mole % reduces transparency.
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TANAKA ZENKI
TANII HIROKUNI
KAWAI SHIYUUJI
TAKAKURA KOUICHI
