Membrane modified hydrogels

Details Membrane modified hydrogels Membrane modified hydrogels

1980-07-28

1983-12-27

Robinson, Ellis P.

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424 19, 424DIG7, 428 36, 4283066, 4283105, 4283202, 4283215, 4283227, 428212, 428218, 428402, 428409, 428398, 428407, 525903, 525905, B32B 1120

Patent

active

044230990

ABSTRACT:
Non-uniform water-insoluble interpenetrating polymer blend compositions comprising a first permeable water swellable polymer substrate interpenetrated in a gradient substantially normal to the substrate surface by a second less permeable condensation polymer to form a diffusion rate controlling membrane therein. Such compositions are useful as polymers with reduced permeabilities for water and organic solvents and therefore for the controlled delivery of active ingredients such as fragrances and bio-affecting agents into air or aqueous environments, or in membrane separation processes.

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