Method for production of expansible macromolecular material and

Details Method for production of expansible macromolecular material and Method for production of expansible macromolecular material and

1987-09-30

1988-06-28

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

264 49, 264234, 2642888, 2642896, 521 64, 521141, 21050042, B05B 300, B29C 3502

Patent

active

047537612

ABSTRACT:
An expansible macromolecular material is produced by a method which comprises mixing an aqueous polyvinyl alcohol solution, an acidic aqueous macromolecular electrolyte solution, and a basic aqueous macromolecular electrolyte solution thereby preparing a composite polymer and subjecting this composite polymer to at least one cycle of alternate freezing and defrosting treatments. A macromolecular membrane constituted of said expansible macromolecular material and containing numerous through holes is obtained by mixing, freezing, and defrosting the aforementioned three mixed aqueous solutions under specific conditions.

REFERENCES:
patent: 3876581 (1975-04-01), Neogi
patent: 4083906 (1978-04-01), Schindler et al.
patent: 4109066 (1978-08-01), Dick et al.
patent: 4401790 (1983-08-01), Ter Jung et al.

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