C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
204/91.37
C08J 9/28 (2006.01) B01D 67/00 (2006.01) B29C 67/20 (2006.01) B32B 5/18 (2006.01)
Patent
CA 1231318
METHOD FOR MANUFACTURING MICROPOROUS MEMBRANE ABSTRACT OF THE DISCLOSURE The starting materials for the practice of the present invention are (1) one or more organic monomers or oligomers which upon ir- radiation very rapidly undergo a polymerization reaction to form a solid polymer; and (2) a liquid vehicle in which the one or more organic monomers or oligomers are soluble but in which the polymer formed is insoluble. For the manu- facture of microporous membrane in accordance with the invention the monomers or oligomers are dissolved in the liquid vehicle, the result- ing solution is formed into a thin layer, and the thin layer of the solution is then irradiat- ed as with ultraviolet or electron beam radia- tion whereupon the rapid polymerization reaction immediately ensues and the polymer formed im- mediately segregates from the vehicle thereby resulting in microporous membrane from which the vehicle can be removed as by evaporation or washing. Because the radiation-induced polymerization reaction and the segregation of the polymer formed are so rapid, the membrane formed has cells and communications there- between of very small dimensions thereby pro- viding the microporous structure. Where ultra- violet radiation is used the solution also includes a photoinitiator.
431286
Pall Corporation
Smart & Biggar
LandOfFree
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