Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Patent
1989-09-20
1992-04-21
McCamish, Marion E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
522 86, 521 505, 521 52, C08F 246, C08J 938
Patent
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.
Chapman Mark A.
McCamish Marion E.
Terumo Kabushiki Kaisha
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