Interlayer films for laminated glazing containing silica with specific refractive index
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United States of America Patent
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Oct 18, 2011
Grant Date -
May 20, 2010
app pub date -
Apr 4, 2008
filing date -
Apr 5, 2007
priority date (Note) -
Expired
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Abstract
Interlayer films useful for laminated glass contain a polyvinyl acetal (A), at least on plasticizer (B), fumed silica (C) and at least one basic compound (D), wherein the difference of refractive index between fumed silica (C) and plasticized polyvinyl acetal (A+B) is 0.015 or less, and the weight ratio of C/(A+B) is 2.7-60/100.
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