Water absorbent structures

Details Water absorbent structures Water absorbent structures

1988-07-28

1990-02-20

Van Balen, William J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

428284, 4283159, 4283166, 4283171, 428913, 604368, 604369, B32B 326, B32B 712

Patent

active

049025651

ABSTRACT:
Water absorbent structures are disclosed which are intended for use as wound dressings, disposable nappies (diapers) or similar applications. The structures comprise a flexible porous substrate, e.g. an open-cell foam web which is impregnated with (a) a solid, water-insoluble water absorber which has a fine particle size and is capable of absorbing at least 30 times its weight of water and (b) a hydrophilic binder which retains the water absorber in the substrate and comprises a substantially non-cross-linked, water-insoluble, hydrogel forming polymer.
Component (a) has a high affinity for water due to the presence of hydrophilic groups in the polymer, but is insoluble in water and in common organic solvents. Component (b) is also water-insoluble, but because of its non-cross-linked structure is soluble in common organic solvents, such as ethanol.

REFERENCES:
patent: 4826723 (1989-05-01), Brambach

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