Process for the preparation of gel for use as cooling medium

Details Process for the preparation of gel for use as cooling medium Process for the preparation of gel for use as cooling medium

1987-08-19

1990-05-15

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

049256033

ABSTRACT:
A process for the preparation of a gel for use as a cooling medium is provided which comprises the steps of casting an aqueous solution or suspension containing a polyvinyl alcohol having a degree of hydrolysis of not less than 95 mol % and a viscosity average polymerization degree of not less than 1500 into a mold having desired shape and dimensions, cooling the cast aqueous solution to a temperature of not higher than - (minus) 6.degree. C., and then dehydrating without thawing the cooled mass of the cast aqueous solution in vacuum until the percentage dehydration rate reaches not less than 5 wt %.

REFERENCES:
patent: 4472542 (1984-09-01), Nambu
patent: 4664857 (1987-05-01), Nambu
Japanese Patent Pub. 11311/1980.
Japanese Patent Pub. 30358/1980.

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