Polyethylene membrane

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 69/02 (2006.01) B01D 39/16 (2006.01) B01D 46/00 (2006.01) B01D 67/00 (2006.01) B01D 71/26 (2006.01)

Patent

CA 2716272

The invention relates to a porous membrane having a particle filtration value of at least 10 under U.S. Military Standard MIL-STD-282 (1956), where the porous membrane is a polyethylene membrane made from a blend of UHMWPE and UMWPE. The membranes according to the invention are particularly useful for filters such as ASHRAE filters, HEPA filters and ULPA filters for example in heating, ventilating, respirators and air conditioning applications. The membranes are produced involving a biaxial streching step at low deformation speed.

Cette invention se rapporte à une membrane poreuse qui présente une valeur de filtration de particules dau moins 10 par rapport à la norme militaire américaine MIL-STD-282 (1956), la membrane poreuse étant une membrane en polyéthylène réalisée à partir d'un mélange d'UHMWPE et d'UMWPE. Les membranes selon l'invention sont particulièrement utiles pour des filtres tels que des filtres ASHRAE, des filtres HEPA et des filtres ULPA, destinées par exemple à des applications de chauffage, de ventilation, de respirateurs et de climatisation. Les membranes sont produites en mettant en uvre une étape d'allongement biaxial à faible vitesse de déformation.

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