Method for preparing light polarizer

Details Method for preparing light polarizer Method for preparing light polarizer

1988-08-09

1990-01-23

Lowe, James

Stock material or miscellaneous articles

Composite

Of polyester

264 13, 264 78, 264134, 2642902, 428522, 428910, B29C 5510, B32B 2708

Patent

active

048957690

ABSTRACT:
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.

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patent: 4592623 (1986-06-01), Yamamoto et al.
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