Method of producing a cellulose ester film

Details Method of producing a cellulose ester film Method of producing a cellulose ester film

2009-04-13

2011-11-22

Vargot, Mathieu D. (Department: 1742)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Light polarizing article or holographic article

C264S002600, C264S002700, C264S217000

Reexamination Certificate

active

08062562

ABSTRACT:
A cellulose ester film exhibiting: a free volume radius of 0.25 to 0.31 nm and a half-width of 0.04 to 0.1 nm, the free volume radius and the half-width being determined by positron annihilation lifetime spectroscopy; and Ro of 0 to nm and Rt of −30 to +20 nm, Ro and Rt being defined by the following equations: Equation (a): Ro=(nx−ny)×d; Equation (b): Rt=((nx+ny)/2−nz)×d (Ro: in-plane retardation, Rt: retardation in the thickness direction of the film, nx: in-plane refractive index in slow axis direction, ny: in-plane refractive index in fast axis direction, nz: refractive index in the thickness direction of the film (refractive indexes being measured at wavelength of 590 nm), d: thickness of the film (nm)).

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patent: 2006/0181774 (2006-08-01), Ojima et al.
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