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

C - Chemistry, Metallurgy

09

K

31/34

C09K 5/00 (2006.01) C09K 5/06 (2006.01)

Patent

CA 1176048

ABSTRACT OF THE DISCLOSURE: 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 dimentions, cooling the cast aqueous solution to a temperature of not higher than - (minus) 6°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%.

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