Fluoropolymer membrane
AssigneePall Corporation
InventorsRobert Ieraci, Thomas Hartmann, David Newman, Nicholas Zerilli
Life of this patent
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Abstract
A porous fluoropolymer membrane comprising a first surface, a second surface, nodes and free fibrils, wherein one of the first and second surfaces has a greater number of free fibrils per unit area of the surface than the other of the first and second surfaces, is disclosed. A process for preparing porous fluoropolymer membranes is also disclosed, comprising splitting a thicker membrane in a dimension different from, e.g., perpendicular to, its thickness dimension.
Claims23
A porous fluoropolymer membrane comprising a first surface, a second surface, nodes, and free fibrils, wherein one of the first and second surfaces has a greater number of free fibrils per unit area of the surface than the other of the first and second surfaces.
A porous fluoropolymer membrane comprising a first surface, a second surface, and free nodes, wherein one of the first and second surfaces has a greater number of free nodes per unit area of the surface than the other of the first and second surfaces.
A porous fluoropolymer membrane comprising nodes and fibrils having a pressure drop of less than x and a thickness less than t, wherein x and t are the pressure drop and thickness respectively of another porous fluoropolymer membrane having nodes and fibrils and having substantially the same porosity or pore rating as the porous fluoropolymer membrane having a pressure drop of less than x and a thickness less than t.
A process for splitting a fluoropolymer membrane comprising:
- (a) providing a fluoropolymer membrane having a first surface and a second surface and a thickness;
- (b) bonding at least a portion of the first or second surface of the fluoropolymer membrane to a first or second support;
- (c) pulling or peeling the first support, the second support, or the first and second supports apart so that the fluoropolymer membrane splits in a dimension different from its thickness dimension to provide a fluoropolymer membrane having a third surface and a fourth surface.
Dependencies are inferred from the claim text.