Process for producing aromatic polyimide composite separating me

Details Process for producing aromatic polyimide composite separating me Process for producing aromatic polyimide composite separating me

1982-06-11

1984-04-03

Lusignan, Michael R.

Liquid purification or separation

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Material

55158, 427379, 4273935, 4284735, 528353, B01D 3900, B01D 3914, B05D 302

Patent

active

044406436

ABSTRACT:
An aromatic polyimide composite membrane having an excellent gas-separating property is produced by a process comprising the steps of: coating at least one surface of a substrate consisting of an aromatic polyimide porous membrane with a solution of 0.05% to 10% by weight of an aromatic polyamic acid in a polar organic solvent, which is not capable of dissolving the polyimide porous membrane, at a temperature not exceeding 140.degree. C.; after a during drying the resultant thin coating layer of the polyamic acid solution, heating the resultant polyamic acid layer at a temperature of 150.degree. C. or more so as to convert the polyamic acid layer to the corresponding polyimide layer.

REFERENCES:
patent: 4240914 (1980-12-01), Iwama et al.
patent: 4271288 (1981-06-01), Woo
patent: 4347286 (1982-08-01), Ishizaka et al.
patent: 4358581 (1982-11-01), Sutton

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