Dimensionally-stable microporous webs
AssigneeAmtek Research International LLC
InventorsWeston J. Wood, Richard W. Pekala, Robert Waterhouse, Scott D. Butler
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Abstract
Multi-layer structures are disclosed herein containing a microporous polymer web having two major surfaces and an inorganic material including nano- and micro-particles formed as a first porous layer on one or both of the major surfaces of the microporous polymer web. The first porous layer provides high-temperature dimensional stability and preserved multi-layer structure above the melting point of the microporous polymer web even as fluid permeability of the unitary multi-layer structure is decreased at elevated temperature. The first porous layer has improved peel strength as compared to an equivalent layer devoid of nanoparticles.
Claims16
A battery separator comprising:
- a free-standing unitary multi-layer structure comprising a microporous polymer web characterized by a melting point and having two major surfaces and an inorganic material including nano-particles and micro-particles formed as a first porous layer on both of the major surfaces of the microporous polymer web, the nano-particles exhibiting a mean size less than or equal to 100 nm and the micro-particles exhibiting a mean size greater than 100 nm, the nano-particles forming 10% to 90% by weight of the inorganic material, the first porous layer comprising an organic hydrogen bonding component comprising one or more polyacrylic polymers, the inorganic material including sufficient nano-particles such that the first porous layer exhibits an average peel strength of at least 47 N/m, the first porous layer providing high-temperature dimensional stability and preserved multi-layer structure above the melting point of the microporous polymer web even as fluid permeability of the unitary multi-layer structure is decreased at elevated temperature.
Dependencies are inferred from the claim text.