Process for preparing a hydrogel

Details Process for preparing a hydrogel Process for preparing a hydrogel

1985-06-27

1987-05-12

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

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

264101, 264102, B29C 3516

Patent

active

046648577

ABSTRACT:
A hydrogel which has a water content of 20 to 92 weight % and which is stable and superior in mechanical properties is obtained by preparing a 3 to 25 weight % aqueous solution of a polyvinyl alcohol having a degree of hydrolysis not less than 95 mol % and a viscosity-average polymerization degree of not less than 1,500, then pouring the aqueous polyvinyl alcohol solution into a desired shape of a vessel or a mold, then freeze-molding the aqueous polyvinyl alcohol solution at a temperature lower than -6.degree. C., thereafter dehydrating the molded article without thawing it until the dehydration percentage reaches 5 weight % or more and, if required, immersing the dehydrated product in water.

REFERENCES:
patent: 4305502 (1981-12-01), Gregory
patent: 4472542 (1984-09-01), Nambu
"Fragrance Journal" (Japan) 2(7)68(1974).
Japanese Patent Publication No. 12854-1972 (English Translation).
Japanese Patent Publication No. 8071/77 (English Translation).
Partial Translation of Japanese Patent 52008-71.

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