Phase difference film, method for producing same, polarizing plate, and liquid crystal display device
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United States of America Patent
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Apr 26, 2016
Grant Date -
May 22, 2014
app pub date -
May 28, 2012
filing date -
Jun 3, 2011
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Abstract
The problem of the present invention is to provide a phase difference film, by utilizing a cellulose ester having an acyl group substitution degree of less than 2.0 and improved compatibility, having high phase difference property despite its small film thickness and imparting high contrast and optical transmittance to a liquid crystal display device. A polarizing plate and a liquid crystal display device provided with the phase difference film are also provided. The phase difference film of the invention contains a cellulose ester which is obtained by substituting an acyl group having at least two carbon atoms for a hydroxy group in a glucose unit composing a cellulose, the film satisfies specific expressions when DS2, DS3 and DS6 are degrees of substitution of the acyl groups for the hydroxy groups at a 2C, 3C and 6C positions, respectively, of the glucose unit.
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