Microporous membrane with a stratified pore structure...

B - Operations – Transporting – 01 – D

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B01D 69/12 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 71/36 (2006.01) B29C 44/22 (2006.01) B29C 55/00 (2006.01) B29C 55/02 (2006.01) B32B 5/32 (2006.01)

Patent

CA 2231270

A microporous membrane is described comprising at least two layers, wherein each layer is characterized by nodes interconnected by fibrils, the layers are bonded by means of plastic flow at temperatures below the melting point of either membrane material, and the pore architecture is formed in situ by an expansion process. A stratified microporous membrane is produced wherein the pore architecture of each layer may be discreetly controlled. The article is useful for filtration and medical applications where a pore size gradient is required.

Membrane microporeuse constituée d'au moins deux couches, dans laquelle chaque couche est caractérisée par des noeuds reliés entre eux par des fibrilles, les couches sont liées par fluage plastique à des températures inférieures au point de fusion des deux matériaux, et l'architecture des pores est formée in situ par un processus d'expansion. On produit une membrane microporeuse stratifiée dans laquelle l'architecture de pore de chaque couche peut être ajustée de façon séparée. Cet article est utile pour le filtrage et pour des applications médicales, lorsqu'un gradient de dimensions de pores est nécessaire.

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