Selective gas permeable membrane

Abstract

Abstract PURPOSE:To enhance the transmission coefficient of oxygen while holding a good membrane forming property and membrane strength, by using polyurethane urea soluble in a solvent as a material for preparing a gas permeable membrane. CONSTITUTION:The titled gas permeable member comprises polyurethane urea represented by formula obtained by reacting a diaminopolysiloxane having a primary amino group or a secondary amino group at the molecular terminal thereof, an isocyanate compound and a polyhydroxy compound. In the formula R1 is a hydrogen atom or an 1-5C hydrocarbon group, R2 is a methyl group, R3 is a methyl group or a phenyl group, (l) is an integer of 2-6 and m+n is an integer of 10 or more. The mixing mol ratio of diaminopolysiloxane and the isocyanate compound is pref. within a range of 1:1-5. In preparing said polyurethane urea, diaminopolysiloxane is dissolved in an org. solvent and reacted with the isocyanate compound at 0-5 deg.C for 2hr in a nitrogen stream and the polyhydroxy compound is subsequently added to the reaction mixture to perform reaction at raised temp. of 40-100 deg.C.

Inventors

• 👤 Juji Konagaya
• 👤 重次 小長谷
• 👤 Koji Fukuda
• 👤 福田　紘二
• 👤 Shinsuke Takegami
• 👤 竹上　信介
• 👤 Masao Murano
• 👤 村野　政生

Bibliographic Details