Stretched Film, Process For The Production Thereof And Laminated Material
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United States of America Patent
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Issued Date -
Aug 23, 2007
app pub date -
Feb 9, 2005
filing date -
Mar 31, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
This invention provides an optical-anisotropy-controlled stretched film suitable for use as a retardation film and a retardation-functioning protective film for a sheet polarizer in a liquid crystal display, a process for the production thereof and a laminated material using the same. The present invention is a stretched film (X) obtained from a resin composition by melt-extrusion casting followed by stretching at least in one direction, (1) the resin composition containing a specific maleimide-olefin copolymer (A) and an acrylonitrile-styrene copolymer (B) containing 21 to 45% by weight of an acrylonitrile unit, and having a copolymer (A) content of at least 50% by weight but not more than 99% by weight and a copolymer (B) content of at least 1% by weight but not more than 50% by weight, (2) its maximum retardation (Rp) at 550 nm in an in-plane direction, satisfying the following expression, 10 nm
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