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

1987-11-30

1990-05-08

Spear, Frank

Liquid purification or separation

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Supported, shaped or superimposed formed mediums

21050041, B01D 1300

Patent

active

049236075

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:
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patent: 3762566 (1973-10-01), DelPico
patent: 3884801 (1975-05-01), Kesting
patent: 3923939 (1975-12-01), Baker et al.
patent: 4077407 (1978-03-01), Theeuwes et al.
patent: 4138344 (1979-02-01), Chol et al.
patent: 4248855 (1987-02-01), Blank et al.
patent: 4353962 (1982-10-01), Himel et al.
patent: 4519909 (1985-05-01), Castro
Kirk-Othmer, Encyclopedia of Chemical Technology, 3rd Ed., Supplement, John Wiley & Sons, Inc., N.Y. (1984), pp. 643-644, 665.

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