Process of making a crosslinked superabsorbent polyurethane foam

Details Process of making a crosslinked superabsorbent polyurethane foam Process of making a crosslinked superabsorbent polyurethane foam

1986-07-18

1988-02-16

Anderson, Harold D.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521905, 528 66, 528 75, C08L 7500, C08G 1810, C08G 1867

Patent

active

047256281

ABSTRACT:
A superabsorbent polyurethane foam which contains a plurality of polycarbonyl moieties covalently attached to the polyurethane through at least one urethane, thiourethane, or urea linkage. The carbonyl portions of such polycarbonyl moieties can be carbamoyl, substituted carbamoyl, or carboxy or the alkali metal or ammonium salts thereof. The foam can be prepared by mixing an isocyanate-terminated prepolymer with a first compound having at least one isocyanate-reactive group and at least one carbon-carbon double bond, allowing the mixture to react, and then mixing with the resulting product an aqueous solution of a carboxylate-containing second compound having at least one carbon-carbon double bond. A thermally activated free radical initiator is present in the final reaction mixture.
Preferably, the polyurethane is derived from an isocyanate-terminated poly(oxyalkylene) polyol having an isocyanate functionality greater than two and the polycarbonyl moieties are derived from second compounds which typically are acrylate or methacrylate salts, i.e., alkali metal or ammonium salts of acrylic or methacrylic acid. The first compound usually is the 2-hydroxyethyl ester of acrylic or methacrylic acid.
Such superabsorbent polyurethane foam is useful in the manufacture of absorbent articles, especially disposable absorbent articles such as diapers, sanitary napkins, bedpads, incontinent pads, and the like.

REFERENCES:
patent: 2920983 (1960-01-01), Bugosh
patent: 3382090 (1968-05-01), Meisel et al.
patent: 3860537 (1975-01-01), Graham et al.
patent: 4359558 (1982-11-01), Gould et al.

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