Membrane containing a liquid active substance and process for th

Details Membrane containing a liquid active substance and process for th Membrane containing a liquid active substance and process for th

1990-03-01

1991-03-19

Spear, Frank

Coating processes

Foraminous product produced

Microporous coating

210490, 21050041, B01D 6700

Patent

active

050009877

ABSTRACT:
A liquid active substance-containing membrane having an anisotropic structure comprising (a) a polymeric cellular layer containing a myriad of minute closed cells and septa thereof and (b) a dense thin layer covering the surface of the cellular layer, wherein the minute cells contain therein a liquid active substance having a limited solubility in the polymer at normal temperature. The membrane of the present invention can be advantageously used to release a liquid active substance such as pheromones and pesticides at a substantially constant, controlled rate over a long period of time.

REFERENCES:
patent: 4131648 (1978-12-01), Choi et al.
patent: 4814183 (1989-03-01), Zentner

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