Oleophobic filter materials for filter venting applications

B - Operations – Transporting – 01 – D

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B01D 39/16 (2006.01) B01D 39/08 (2006.01) B01D 39/20 (2006.01) B01D 67/00 (2006.01) D06M 14/18 (2006.01) D06M 15/356 (2006.01) D06M 15/643 (2006.01)

Patent

CA 2375077

Oleophobic and hydrophobic filters for filter venting applications are made by forming a polydimethylsiloxane coating on the surface of a filtration substrate. The filters have high water penetration pressures and high air permeabilities. The coatings are formed by polymerizing vinyl terminated siloxane with a crosslinker such as hydrosilicone in the presence of a catalyst. Alternatively, the coatings can be formed by heat curing after exposing the substrate to methyl silicone and crosslinking at high temperature.

L'invention concerne des filtres oléophobes et hyrdrophobes destinés à des applications d'aération dans des filtres, réalisés par formation d'un revêtement en polydiméthylsiloxane sur la surface d'un substrat filtrant. Ces filtres présentent des pressions de pénétration d'eau et des perméabilités à l'air élevées. Les revêtements sont formés par polymérisation de siloxane à terminaison vinylique, avec un réticulant tel que l'hydrosilicone en présence d'un catalyseur. Les revêtements peuvent également être formés par polymérisation à chaud après exposition du substrat au méthyl-silicone, et par réticulation à température élevée.

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