Aromatic polyimide double layered hollow filamentary membrane an

Details Aromatic polyimide double layered hollow filamentary membrane an Aromatic polyimide double layered hollow filamentary membrane an

1989-04-06

1992-08-25

Spear, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050023, 21050039, 427246, B01D 6908

Patent

active

051416425

ABSTRACT:
An aromatic polyimide double layered hollow filamentary membrane having an excellent heat resistance, chemical resistance, pressure-resistance, and gas-permeating and separating properties comprises (A) an aromatic imide polymer hollow filamentary microporous inner layer and (B) an aromatic imide polymer tubular filamentary asymmetric outer layer composed of (a) tubular filamentary microporous intermediate layer covering and united with the outside surface of the inner layer (A) and (b) a thin dense outside surface layer covering and united with the intermediate layer (a).

REFERENCES:
patent: 4267047 (1981-05-01), Henne et al.
patent: 4440643 (1984-04-01), Makino et al.

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