Method for preparing light polarizer

Details Method for preparing light polarizer Method for preparing light polarizer

B - Operations, Transporting

29

C

18/103

B29C 55/10 (2006.01) B32B 27/08 (2006.01) G02B 1/08 (2006.01) G02B 5/30 (2006.01)

Patent

CA 1322637

ABSTRACT OF THE DISCLOSURE A stainable polymeric sheet material adapted to the production of a light polarizer therefrom is provided by a method, according to which, a support sheet of amorphous polymeric material is uniaxially stretched in a first direction (at or above the glass transition temperature of the polymeric support material), a layer of polyvinyl alcohol (PVA) is coated from an aqueous PVA-containing composition onto the uniaxially stretched support material, and the PVA- coated uniaxially stretched polymeric sheet material is stretched along a second direction, at an angle within about ? 60 degrees to a normal to the first direction of stretch. The method provides a material which can be converted, by incorporation of visible dichroism into the PVA layer, to a light polarizer which combines efficient light polarizing properties and good mechanical strength and resistance to fracture along the stretch directions.

606100

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