POROUS FILM HAVING REACTIVE POLYMER LAYER THEREON FOR USE IN BATTERY SEPARATOR, AND USE OF THE POROUS FILM
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United States of America Patent
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Issued Date -
Dec 30, 2010
app pub date -
Oct 23, 2008
filing date -
Oct 26, 2007
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a reactive polymer layer-supported porous film for battery separator, including: a porous film substrate; and a reactive polymer layer supported on the porous film substrate, the reactive polymer layer having a thickness of 2 μm or less and being obtained by a crosslinking reaction between a polyfunctional isocyanate and a crosslinkable polymer having both a reactive group capable of reacting with an isocyanate group and a cationically polymerizable functional group in the molecule thereof, in which the reactive polymer layer has a plurality of through-holes having an average pore diameter of 5 μm or less.
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