Method of making light polarizer
First Claim
1. A method of making a light polarizing element comprising the steps ofimmersing a uniaxially stretched film of polyvinyl alcohol in an iodine stain solution, andrestretching said stained film in substantially the previously uniaxially stretched direction while immersing it in a borating solution comprising an aqueous solution of boric acid, potassium iodide and zinc ion.
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Abstract
There is described a method for making visible range dichroic polarizer material comprising a uniaxially stretched film of polyvinyl alcohol stained with iodine and treated with a borating solution containing a zinc salt. The method comprises the steps of staining a uniaxially stretched sheet of polyvinyl alcohol and further stretching the stained sheet while it is being treated with a borating solution containing a zinc salt. High efficiency visible range dichroic polarizer elements having good neutrality, very high extinction and high transmittance can be made according to the method.
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Citations
5 Claims
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1. A method of making a light polarizing element comprising the steps of
immersing a uniaxially stretched film of polyvinyl alcohol in an iodine stain solution, and restretching said stained film in substantially the previously uniaxially stretched direction while immersing it in a borating solution comprising an aqueous solution of boric acid, potassium iodide and zinc ion.
Specification