Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1989-06-26
1991-06-25
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526213, 5263171, 5263181, C08F 208, C08F 2006, C08F12006
Patent
active
050268007
ABSTRACT:
Water-absorbent resins having an average particle diameter of 100 to 600 .mu.m and a particle diameter distribution of 0.35 or less are prepared by polymerizing an aqueous solution of a water-soluble ethylenically unsaturated monomer, pulverizing and sieving the gel-like polymer so obtained, and crosslinking the surface of the polymer powder. In an alternative process, an aqueous solution of the monomer having a viscosity greater than 15 cps is dispersed in a hydrophobic organic solvent and polymerized to obtain a polymer powder, and the surface of the polymer powder is crosslinked.
REFERENCES:
patent: 4683274 (1987-07-01), Nakamura et al.
patent: 4732968 (1988-03-01), Obayashi et al.
patent: 4734478 (1988-03-01), Tsubakimoto et al.
patent: 4880888 (1989-11-01), Obayashi et al.
Kadonaga Kenji
Kimura Kazumasa
Miyake Koji
Nagasuna Kinya
Namba Takashi
Nippon Shokubai Kagaku Kogyo & Co., Ltd.
Schofer Joseph L.
Weber Tom
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