membranfiltermaterial with excellent resistance to organic solvents, processes for the manufacture of membranfilters and processes for the manufacture of bismaleimidpolymer for use as membrane filters.

摘要

A bismaleimide polymer, useful as a membrane filter material, is formed by polymerising a bismaleimide compound with a perhydrodiaza-type heterocyclic compound and has a main structural skeleton represented by the following formula: CHEM wherein R1, R2, R3 and R4 represent a lower carbon chain which is linear or contains a methyl group or ethyl group on the side chain, R5 represents a divalent group containing an aromatic ring, Y is R or N-R-N in which R is a lower carbon chain, and m is 0 or 1. This membrane filter material has excellent organic solvent resistance and when formed into a hollow fiber or plain film has a high separating and filtering capacity and an excellent organic resistance.