摘要 |
<p>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.</p> |
申请人 |
POLAROID CORP., CAMBRIDGE, MASS., US |
发明人 |
LAND, EDWIN H., CAMBRIDGE MA 02138, US;DIROCCO, ANTHONY J., BILLERICA MA 01821, US;POLIZZOTTO, LEONARD, STOW MA 01775, US |