Cellulose acylate resin film and method for producing the same
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United States of America Patent
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Jan 24, 2012
Grant Date -
Mar 8, 2007
app pub date -
Sep 1, 2006
filing date -
Sep 2, 2005
priority date (Note) -
Expired
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Abstract
The present invention provides a method for producing a cellulose acylate resin film, comprising the step of, melting a cellulose acylate resin in an extruder and extruding the molten cellulose acylate resin to a die, wherein the step of melting is carried out using a tandem extruder having a first-stage extruder and a second-stage extruder connected in tandem, in order to prevent discoloration and thickness non-uniformity make the film seriously defective for use as an optical film. Because the resin in the form of a powder or flakes is once pelletized in a pelletizing extruder, and then the pellets are melt-extruded in an extruder. This promotes discoloration of the resin, disadvantageously.
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