Optical phase plate and production process thereof

Details Optical phase plate and production process thereof Optical phase plate and production process thereof

B - Operations, Transporting

29

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B29D 11/00 (2006.01) C08J 5/18 (2006.01) C08L 27/16 (2006.01) C08L 33/12 (2006.01) G09G 3/36 (2006.01)

Patent

CA 2011620

ABSTRACT OF THE DISCLOSURE An optical phase plate in the form of a drawn and oriented film or sheet having a composition comprising a vinylidene fluoride resin and a methyl methacrylate rosin in a mixing ratio of the former to the latter between about 65/35 and about 85/15 by weight, in which the crystal structure of the vinylidene fluoride resin is mainly consists of a .beta.-form and the film or the sheet has a dimensional stability and a retardation value R within a range from 500 to 650 nm. The optical phase plate is produced by uniformly kneading and melt extruding PVDF/PMMA mixture into a sheet and subjecting the sheet to drawing and then to heat treatment.

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