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US Patent 7875328 Optical film and information technology apparatus comprising the same

Patent 7875328 was granted and assigned to LG Chem on January, 2011 by the United States Patent and Trademark Office.

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Patent abstract

The present invention relates to an optical film comprising an aromatic based unit having chain having the hydroxy group containing portion and aromatic moiety; and a styrene-based unit comprising one or more styrene-based derivatives, and has absolute values of in-plane retardation (Rin) and thickness retardation (Rin) of 10 nm or less regardless of stretching, and a polarizing plate and an information technology apparatus including the same.

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