Membrane filter material having excellent organic solvent resist

Details Membrane filter material having excellent organic solvent resist Membrane filter material having excellent organic solvent resist

1990-10-31

1991-07-30

Foelak, Morton

Liquid purification or separation

Filter

Within flow line or flow line connected close casing

21050023, 21050039, B01D 2900

Patent

active

050358022

ABSTRACT:
A membrane filter material formed from a solvent resistant bimaleimide polymer which is formed by polymerizing a bismaleimide compound with a perhydrodiaza-type heterocyclic compound and has a main structural skeleton represented by the following formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represents a lower carbon chain which is linear or contains a methyl group or ethyl group on the side chain, R.sub.5 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 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 is provided by preparing the bismaleimide polymer by reacting the bismaleimide compound and perhydrodiaza-type heterocyclic compound in a halogen-containing organic solvent in the present of a small amount of a phenol.

REFERENCES:
patent: 4921931 (1990-05-01), Wang
patent: 4923959 (1990-05-01), Kan et al.
patent: 4927907 (1990-05-01), Corley

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