Cellulose resin film, process for producing cellulose resin film, antireflection film, polarizing plate, and liquid crystal display
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United States of America Patent
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Mar 1, 2016
Grant Date -
Oct 9, 2008
app pub date -
Oct 19, 2006
filing date -
Nov 4, 2005
priority date (Note) -
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Abstract
A cellulosic resin film which is wide and, despite this, is extremely reduced in breakage during a stretching step; a process for producing the film; and an antireflection film, a polarizer, and a liquid-crystal display each comprising or employing the film. The process for cellulosic resin film production comprises casting a liquid cellulosic resin on a support to form a web, peeling the web from the support, subsequently drying the web in a first edge gripping step (105) while gripping both edges, temporarily eliminating the edge gripping, and then stretching both edges in the width direction in a second edge gripping step (109). The process is characterized in that the first edge gripping step is followed by a heat treatment step in which both edge parts of the web relieved from the edge gripping are heated with heating rolls (107 and 108).
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