Film composites
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United States of America Patent
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Apr 13, 2004
Grant Date -
N/A
app pub date -
Nov 13, 2001
filing date -
Mar 31, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optically active film composite comprising a transparent substrate and at least one layer of a block copolymer blend comprising between 30:70 to 70:30 percent by volume of each component of the copolymer, the block copolymer forming lamellar microdomains of each polymeric component, which components have different refractive indices. The thickness of the lamellae may be controlled through selection of molecular weights of the components and by the addition of compatible homopolymers.
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