Freeze-dried polyvinyl alcohol gel

Details Freeze-dried polyvinyl alcohol gel Freeze-dried polyvinyl alcohol gel

1983-08-08

1984-09-18

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

264 28, 424 78, 524557, 528481, C08L 2904

Patent

active

044725426

ABSTRACT:
A process for the preparation of a hydrogel is provided. The process comprises the steps of solidifying an aqueous solution containing 2.5 to 25 wt % of a polyvinyl alcohol of an average polymerization degree of not less than 800 and 1 to 80 wt % of a water-soluble polyhydric alcohol by cooling the aqueous solution to not higher than -3.degree. C. and then dehydrating in vacuum the solidified mass into a percent dehydration degree of 5 to 95 wt %. The hydrogel is suitable for use as a cooling medium.

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