Delayed-swelling absorbent systems

Details Delayed-swelling absorbent systems Delayed-swelling absorbent systems

1984-01-09

1985-10-22

Cannon, James C.

Stock material or miscellaneous articles

Sheet including cover or casing

Noninterengaged fibered material encased

34 9, 34 42, 34DIG1, 128132D, 128156, 252194, 428201, 428247, 428286, 428290, 4283119, 428913, 524186, 524236, 524417, 524916, 5253298, 5253299, 525367, 525371, 525374, 525383, 536 76, 536101, 536102, 536124, 604364, 604368, A61F 1320, B32B 526, C09K 300, C09K 332, F26B 516

Patent

active

045488479

ABSTRACT:
The invention comprises of an anionic polyelectrolyte hydrogel reversibly cross-linked with a polyvalent metal cation having a valence of at least two. This hydrogel may be combined with a removal agent for imparting delayed swelling characteristics when contacted with a water-containing fluid. The delayed swelling allows the water-containing fluid to penetrate or permeate the system before swelling is initiated, thereby providing enhanced wetting prior to the onset of swelling and alleviating gel blockage.

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