Production process for highly water absorbable polymer

Details Production process for highly water absorbable polymer Production process for highly water absorbable polymer

1983-01-21

1985-06-25

Wong, Jr., Harry

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...

428500, 524555, 524827, 526 75, 526240, 526306, 5263076, 5263077, 526311, C08F22006

Patent

active

045255270

ABSTRACT:
Disclosed is a process for preparing water absorbing, cross-linked acrylate resins by aqueous polymerization of (A) acrylic acid neutralized 70 to 100 mole percent for example with ammonia, and/or caustic alkali and/or an amine; with (B) acrylamide in a mole ratio of 70 to 100 mole percent (A) to 30:0 mole percent (B); and (C) a water miscible or a water soluble polyvinyl monomer in an amount of 0.001 to 0.3 weight percent based on the total weight of (A) and (B). In accordance with one embodiment of the invention, the concentration of monomers (A) plus (B) should be at least 70 percent by weight of the polymerization mixture of (A) plus (B) plus (C) to achieve a substantially dry polymer (less than 15 weight percent water) when polymerization is completed by utilizing the exothermic heat of polymerization and cross-linking to drive off water without the need for additional heating to obtain a dry solid. The addition of polystyrene and/or methylcellulose substantially increases the water absorbing capacity of these polymers.

REFERENCES:
patent: 3251194 (1966-05-01), Walker
patent: 4057521 (1977-11-01), Gross
patent: 4058124 (1977-11-01), Yen et al.
patent: 4059552 (1977-11-01), Zweigle et al.
patent: 4459396 (1984-07-01), Yamasaki et al.

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