Process for preparing a hydrogel

Details Process for preparing a hydrogel Process for preparing a hydrogel

C - Chemistry, Metallurgy

08

J

18/1110

C08J 9/28 (2006.01) B01J 13/00 (2006.01) B01J 20/28 (2006.01) C08J 9/26 (2006.01)

Patent

CA 1181915

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°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.

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