MEMBRANE FILTER MATERIAL HAVING EXCELLENT ORGANIC SOLVENT RESISTANCE, METHOD FOR FORMATION OF MEMBRANE FILTER AND PROCESS FOR PREPARATION OF BISMALEIMIDE POLYMER TO BE USED FORMEMBRANE FILTER

摘要

Disclosed is a membrane filter material. A bimaleimide polymer is formed by polymerizing a bismaleimide compound with a perhydrodiaza-type heterocyclic compound and has a main structural skeleton represented by the following formula: <IMG> (wherein R1, R2, R3 and R4 represent a lower carbon chain which is linear or contains a methyl group or ethyl group as a 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 bismaleimide polymer can be made into a membrane filter material having an excellent organic solvent resistance. When this polymer is formed into a hollow fiber or plain film, a high separating and filtering capacity and an excellent organic resistance can be attained. A membrane filter material having an enhanced organic solvent resistance can be provided by further improving the process for the preparation of a bismaleimide polymer.