Process of making an interpenetrating superabsorbent polyurethan

Details Process of making an interpenetrating superabsorbent polyurethan Process of making an interpenetrating superabsorbent polyurethan

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

047256290

ABSTRACT:
A superabsorbent polyurethane foam based on an interpenetrating polymer network of a crosslinked polyurethane and a crosslinked addition polymer containing a plurality of chain segments made up of functional group-containing repeating units which may be the same or different. The functional groups of the repeating units are selected from the group consisting of carbamoyl, substituted carbamoyl, and carboxy and the alkali metal and ammonium salts thereof. A method of preparing the foams is described which involves forming the polyurethane foam in the presence of addition polymerizable monomers and crosslinking agent and a thermally activated free radical initiator. Addition polymerization can take place during or after foam formation. Reactants and reaction conditions are selected so as to essentially avoid grafting addition polymer to polyurethane.
Preferably, the polyurethane is derived from an isocyanate-terminated poly(oxyalkylene) polyol having an isocyanate functionality greater than two and the addition polymer is the reaction product of a crosslinking agent, such as methylene-bis-acrylamide and 1,6-hexanediol diacrylate, with at least one compound selected from the group consisting of acrylamides, substituted acrylamides, and acrylate and methacrylate salts, i.e., alkali metal and ammonium salts of acrylic and 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.

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patent: 4332716 (1982-06-01), Shah
patent: 4359558 (1982-10-01), Gould et al.

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