Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in two or more physically distinct zones
Patent
1991-01-03
1993-01-19
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in two or more physically distinct zones
526 65, 526 73, 526200, 526216, 5263031, 5263072, 526312, 5263171, C08F 220
Patent
active
051807980
ABSTRACT:
An improved process for the production of a water-absorbent resin by reversed phase suspension polymerization of a water-soluble ethylenic unsaturated monomer is disclosed. The process is conducted by subjecting an aqueous solution of a water-soluble ethylenic unsaturated monomer to reversed phase suspension polymerization reaction of a first stage in a petroleum hydrocarbon solvent in the presence of a surfactant and/or polymeric protective colloid by using a radical polymerization initiator optionally in the presence of a crosslinking agent, cooling the resulting slurry to precipitate the surfactant and/or polymeric protective colloid, and adding an aqueous solution of a water-soluble ethylenic unsaturated monomer containing a radical polymerization initiator and optionally a crosslinking agent to the first polymerization reaction system to further carry out the reversed phase suspension polymerization reaction, at least, once.
REFERENCES:
patent: 4226752 (1980-10-01), Erickson
patent: 4618647 (1986-10-01), Fan et al.
patent: 4683274 (1987-07-01), Nakamura
patent: 4880886 (1989-11-01), Kondo
patent: 4914170 (1990-04-01), Chang
Nakamura Morio
Ozawa Hitoshi
Shimada Yasuhiro
Tanaka Hitoshi
Yamamoto Takushi
Schofer Joseph L.
Sumitomo Seika Chemicals Co. Ltd.
Zitomer Fred
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