Water-insoluble hydrogel and method for production thereof by us

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...

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522 86, 521 505, 521 52, C08F 246, C08J 938

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active

051068761

ABSTRACT:
A water-isoluble hydrogel, obtained by cross-linking a polyvinyl alcohol by itself, a polyvinyl pyrrolidone by itself, and a polyvinyl alcohol and a polyvinyl pyrrolidone as a pair by exposure to radiation to a cross-linking degree enough for occlusion therein of 50 to 99% by weight of water and they freezing and thawing the product of said cross-linking, production thereof, and an untrasonic transmission medium using the hydrogel.

REFERENCES:
patent: 4025391 (1977-05-01), Kawashima et al.
patent: 4734097 (1988-03-01), Tanabe et al.

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