Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1987-10-06
1988-11-29
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524503, C08F 216
Patent
active
047882425
ABSTRACT:
The polyvinyl alcohol (PVA)-based gel of the invention is reversibly hydrated so that the gel after complete drying can again absorb water to regain the highly elastic gel-like form. Such a reversibly hydrated PVA-base gel can be prepared by impregnating a hydrated gel of PVA with an ethylenically unsaturated, water-soluble ionic monomer together with or without a free-radical polymerization initiator and bringing the thus monomer-impregnated PVA gel under conditions to cause in situ polymerization of the monomer, e.g., by heating or irradiating with actinic rays such as ultraviolet light.
REFERENCES:
patent: 3549578 (1970-12-01), Ehmann
patent: 4320040 (1982-03-01), Fujita et al.
patent: 4472542 (1984-09-01), Nambu
Kato Tadaya
Takahashi Akira
Reddick J. M.
Schofer Joseph L.
Shin-Estu Chemical Co., Ltd.
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