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US 4,396,646 AGranted
Method of making patterned polarizers
AssigneePolaroid Corporation
InventorsNorman W. Schuler, Gary T. Scupp
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Abstract
A method of making patterned polarizer elements having areas exhibiting different optical properties comprising removing the dichroic dye from selected areas of a linear, dichroic, light polarizer and restaining these selected areas with a different dichroic dye.
Claims14
A method for making linear, dichroic polarizers having areas with different optical properties comprising:
- uniaxially stretching a film of polymeric material;
- staining the stretched film with a first dichroic dye solution;
- selectively masking the stained polymeric film;
- bleaching the masked polymeric film to remove the first dichroic dye from the unmasked areas thereof;
- applying a second dichroic dye solution to the bleached areas of said polymeric film to restain said areas;
- removing the mask from the stained polymeric film;
- and
- treating the stained film with a borating solution.
5 more elements
Dependencies are inferred from the claim text.