Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Reshaping or treatment of an optical preform
Reexamination Certificate
2006-03-06
2010-10-19
Hon, Sophie (Department: 1783)
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Reshaping or treatment of an optical preform
C264S210600, C428S001300, C428S001330
Reexamination Certificate
active
07815823
ABSTRACT:
An object is to provide an optical film in which retardation variation is less even after a long period of duration of use, to provide an optical compensating film in which transparency and flatness are not deteriorated in a stretching process by using the foregoing film as a support, and to provide a polarizing plate and a liquid crystal display exhibiting reduced visibility variation caused by heat generation of an optical LED backlight, and excellent color reproducibility. Disclosed is a manufacturing method of an optical film formed by melt-casting a composition containing a cellulose resin and a plasticizer, wherein the cellulose resin has a residual sulfuric acid content of 0.1-50 ppm, and the composition contains a polymer having a weight average molecular weight of 500-30000 prepared via polymerization of ethylenic unsaturated monomers, or an acrylic polymer having a weight average molecular weight of 500-30000.
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JPO Website Machine English Translation of JP 2002-131536, Yajima et al., May 9, 2002.
Murakami Takashi
Shimizu Kunio
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Hon Sophie
Konica Minolta Opto Inc.
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