Embossed microporous membrane battery separator materials and methods of manufacture and use thereof
AssigneeCelgard, LLC
InventorsKristoffer K. Stokes, Karl F. Humiston
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Abstract
Disclosed are embossed microporous membranes, as well as articles (e.g., battery separators, materials, textiles, composites, and laminates) comprising the embossed microporous membranes. Also provided are methods of making and/or using embossed microporous membranes.
Claims25
An embossed microporous membrane, where the embossed microporous membrane is prepared by a process comprising embossing, calendering or compressing a microporous polymer film including a plurality of pores having a substantially round shape,
- wherein the microporous polymer film exhibits a ratio of machine direction (MD) tensile strength to transverse direction (TD) tensile strength of from 0.5 to 5.0;
- and
- wherein the microporous polymer film is a monolayer or triple-ply film.
An embossed microporous membrane, where the embossed microporous membrane comprises an embossed microporous polymer film, wherein the embossed microporous polymer film is a dry-stretch process film, has a thickness of from 2 microns to 20 microns, a porosity of from 20% to 65%, a JIS Gurley of 500 or less, and a ratio of MD tensile strength to TD tensile strength of from 0.5 to 5.0.
An embossed microporous membrane, wherein the embossed microporous membrane is prepared by a process comprising embossing, calendering or compressing a microporous polymer film with embossing rollers, wherein
- the microporous polymer film is made by a dry stretch process, exhibits a ratio of machine direction (MD) tensile strength to transverse direction (TD) tensile strength from 0.5 to 5.0.
Dependencies are inferred from the claim text.