Process for the preparation of polyvinyl alcohol articles of hig

Details Process for the preparation of polyvinyl alcohol articles of hig Process for the preparation of polyvinyl alcohol articles of hig

1987-10-13

1989-03-14

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264203, D01F 614

Patent

active

048122777

ABSTRACT:
Polyvinyl alcohol articles of high strength and modulus are obtained by thermoreversible gelation of a polyvinyl alcohol solution, extraction of the gelation solvent using a mixture of a low alcohol or ketone and water, followed by high stretching. Preferably, a mixture of 5-80 vol. % of acetone and 95-20 vol. % of water is used as extractant. With this process extraction times of only 3-10 minutes are required.

REFERENCES:
patent: 3066999 (1962-12-01), Nakajo et al.
patent: 4440711 (1984-04-01), Kwon et al.
patent: 4603083 (1986-07-01), Tanaka et al.

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