VAPOR BARRIER FILM, DISPERSION FOR VAPOR BARRIER FILM, METHOD FOR PRODUCING VAPOR BARRIER FILM, SOLAR CELL BACK SHEET, AND SOLAR CELL
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United States of America Patent
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Issued Date -
Sep 11, 2014
app pub date -
Aug 21, 2012
filing date -
Aug 29, 2011
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Abstract
An object of the present invention is to provide a water vapor barrier film having good flexibility, good moisture resistance, and high mechanical strength. A further object of the present invention is to provide a dispersion for water vapor barrier films which is intended to be used to produce the water vapor barrier film, a method for producing the water vapor barrier film, a solar cell back sheet incorporating the water vapor barrier film, and a solar cell incorporating the water vapor barrier film or the solar cell back sheet. The present invention provided a water vapor barrier film containing: phyllosilicate mineral; and a synthetic resin, wherein the phyllosilicate mineral includes a non-swelling clay mineral and a swelling clay mineral, the phyllosilicate mineral is present in an amount of not less than 30% by weight and not more than 90% by weight of the total weight of the water vapor barrier film, and the water vapor barrier film has a water vapor permeability, measured at 40° C. and 90% RH, of not more than 0.5 g/m2·day.
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