Process for producing phase retarder

Details Process for producing phase retarder Process for producing phase retarder

B - Operations, Transporting

29

C

B29C 71/00 (2006.01) B29C 61/02 (2006.01) B29C 71/02 (2006.01) B29D 7/01 (2006.01) B29D 11/00 (2006.01) G02B 5/30 (2006.01) G02B 27/50 (2006.01) G02F 1/13363 (2006.01) B29C 55/00 (2006.01)

Patent

CA 2084581

ABSTRACT OF THE DISCLOSURE A process for producing a phase retarder film or sheet, which comprises subjecting a stretched thermoplastic resin film or sheet to thermal relaxation at a temperature not lower than the glass transition temperature of the thermoplastic resin to shrink the film or sheet in the stretching axis direction while suppressing the expansion of the film or sheet in a direction parallel to the film or sheet surface and perpendicular to the stretching axis.

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