Water absorbent resins prepared by polymerization in the presenc

Details Water absorbent resins prepared by polymerization in the presenc Water absorbent resins prepared by polymerization in the presenc

1987-06-25

1989-04-11

Schofer, Joseph L.

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

Synthetic resins

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

264140, 264144, 5253299, 525285, 526203, C08F 830, C08F 832, C08F 200

Patent

active

048207730

ABSTRACT:
Improved water-absorbing, crosslinked acrylate resins are prepared 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 the presence of (D) a styrene-maleic anhydride copolymer, neutralized 70 to 100 mole percent for example with ammonia, and/or caustic alkali and/or an amine, in an amount of 1% to 25% based on the weight of acrylic acid or acrylate, such that the amount of (C) is 0.001 to 0.6 weight percent based on the total weight of (A), (B), (C) and (D). In addition, surface treating the water-absorbing crosslinked acrylate resins with a polyquaternary amine substantially further increases both the rate of water absorption and the quantity of water absorbed and retained by the resin. The untreated and the surface-treated resins also maintain the necessary "dry feel" required for most applications.

REFERENCES:
patent: 2984639 (1961-05-01), Stamberger et al.
patent: 3008851 (1961-11-01), Shimizu et al.
patent: 3015653 (1962-01-01), Richards et al.
patent: 3444151 (1969-05-01), Nerdol et al.
patent: 4525527 (1985-06-01), Takeda et al.
patent: 4552938 (1985-11-01), Makita et al.
patent: 4587308 (1986-05-01), Makita et al.

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