Method of preparing water-absorbing resin

Details Method of preparing water-absorbing resin Method of preparing water-absorbing resin

1996-06-28

1997-07-29

Zemel, Irina S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525252, 525267, 5263171, C08F 220

Patent

active

056523092

ABSTRACT:
A method of preparing a water-soluble resin, which comprises the steps of: subjecting an aqueous solution of a first water-soluble ethylenically unsaturated monomer to a first-stage water-in-oil type of reverse-phase suspension polymerization using a water-soluble radical polymerization initiator in a hydrophobic organic solvent in the presence of an emulsifier and optionally a crosslinking agent, thereby forming a slurry containing hydrous polymer gel particles; adding to said slurry a nonionic or anionic surface active agent having an HLB of at least 7 and higher than that of said emulsifier and an aqueous solution of a second water-soluble ethylenically unsaturated monomer so as to absorb the aqueous solution of the second monomer in said hydrous polymer gel particles; and carrying out a second-stage polymerization of said second monomer.

REFERENCES:
patent: 3458603 (1969-07-01), Griffin et al.
patent: 4652511 (1987-03-01), Ueda et al.
patent: 5115031 (1992-05-01), Heim et al.
patent: 5180798 (1993-01-01), Nakamura et al.
patent: 5548047 (1996-08-01), Ito et al.

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