Process for producing highly water absorptive polymer

Details Process for producing highly water absorptive polymer Process for producing highly water absorptive polymer

1989-06-16

1990-09-18

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263031, 526319, 526321, 526323, 5263232, 5263285, 526342, C08F 3004

Patent

active

049579843

ABSTRACT:
A process for producing a highly water adsorptive polymer, which comprises subjecting an aqueous solution of partially neutralized sodium acrylate wherein 20 to 50% or less of the carboxyl group has been neutralized to its sodium salt, the concentration of the partially neutralized sodium acrylate in the aqueous solution being 45 to 80% by weight, to solution polymerization in the presence of a crosslinking agent and optionally not exceeding 20 mol % based on the partially neutralized sodium acrylate of at least one basic vinyl monomer selected from the group consisting of (meth)acrylamide, N,N-dimethyl(meth)acrylamide, dimethylaminoethyl(meth)acrylamide, 2-vinylpyridine, and 4-vinylpyridine with the use of a water soluble radical polymerization initiator.

REFERENCES:
patent: 4769427 (1988-09-01), Nowakowsky et al.
patent: 4833222 (1989-05-01), Siddall et al.

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