HIGHLY-POROUS SEPARATOR FILM WITH A COATING
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United States of America Patent
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Oct 1, 2015
app pub date -
Dec 7, 2012
filing date -
Dec 8, 2011
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Abstract
The invention concerns a biaxially orientated, single- or multi-layered porous film which comprises at least one porous layer and this layer contains at least one propylene polymer;
- (i) the porosity of the porous film is 30% to 80%; and(ii) the permeability of the porous film is <1000 s (Gurley number);characterized in that(iii) the porous film comprises an inorganic, preferably ceramic coating; and(iv) the coated porous film has a Gurley number of <1500 s.
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