Patent ID: 8629193
Filing Date: 2014-01-14
Classification: B01D,C08J

Abstract:
1. A process for producing thin porous moldings comprising a silicone compound S, which comprises a copolymer of formula (III) where the structural element E is one of the formulae (IVa), (IVc), (IVd) and/or (IVf) where the structural element F is one of formulae (Va), (Vc), (Vd) and/or (Vf) where R each independently is a substituted or unsubstituted hydrocarbon moiety, optionally interrupted by oxygen or nitrogen atoms, R R X each independently is an alkylene moiety of 1 to 20 carbon atoms in which mutually nonadjacent methylene units are optionally replaced by —O— groups, or an arylene moiety of 6 to 22 carbon atoms, Y each independently is a divalent, optionally fluorine- or chlorine-substituted hydrocarbon moiety of 1 to 20 carbon atoms, D each independently is an alkylene moiety of 1 to 700 carbon atoms which is optionally substituted by fluorine, chlorine, C B and B′ are reactive or nonreactive end groups attached to the polymer by covalent bonding, m represents an integer from 1 to 4000, n is an integer from 1 to 4000, g is an integer of at least 1, h is an integer from 0 to 40, i is an integer from 0 to 30, and j is an integer greater than 0, wherein the process comprises: a) in a first step, preparing a solution or suspension comprising silicone compound S in a mixture comprising a solvent L1 and a solvent L2, b) in a second step, introducing the solution or suspension into a mold, c) in a third step, removing solvent L1 from the solution or suspension, reducing the solubility of silicone compound S in the mixture comprising solvent L1 and solvent L2 to form a phase A, rich in silicone compound S, and a phase B, lean in silicone compound S, effecting structure formation through phase A, and d) in a fourth step, removing solvent L2 and residues of the solvent L1.