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

1987-10-08

1989-03-07

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264203, D01F 614

Patent

active

048104507

ABSTRACT:
High modulus and high strength articles of polyvinylalcohol are obtained by thermoreversible gelation of a 5-50 wt. % solution of a polyvinylalcohol with an M.sub.W of 2.5.times.10.sup.4 to 5.times.10.sup.5 in water, followed by solvent removal and high stretching.
Pref. gelation is obtained by cooling to a temperature of at least 40.degree. C. below the gelation temperature.
With this process low costs of solvent removal and regeneration are obtained.

REFERENCES:
patent: 3066999 (1962-12-01), Nakajo et al.
patent: 4344908 (1982-08-01), Smith et al.
patent: 4440711 (1984-04-01), Kwon et al.
patent: 4603083 (1986-07-01), Tamka et al.
The references listed through above have been considered and are listed on reference form PTO-892.

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