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US 9,069,137 B2Granted
Polarizer having enhanced photodurability and method for preparing the same
AssigneeCheil Industries Inc.
InventorsChang Seok Bae, Jin Sook Kim, Eun Mi Kim, Pil Joo Kim, Eun Su Park, Jae Bin Song
Life of this patent
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Abstract
A polarizer includes boric acid, potassium iodide, and a zinc salt. The zinc salt has a concentration gradient in which the concentration of the zinc salt gradually decreases from a surface of the polarizer to an interior thereof.
Claims12
A polarizer comprising:
- boric acid;
- potassium iodide;
- and
- a zinc salt, wherein the zinc salt has a concentration gradient in which the concentration of the zinc salt gradually decreases from a surface of the polarizer to an interior thereof.
1 more element
A method for preparing a polarizer, the method comprising:
- immersing a polyvinyl alcohol film in an aqueous dyeing solution containing iodine and potassium iodide to obtain a dyed polyvinyl alcohol film;
- immersing the polyvinyl film in a swelling bath before immersing the polyvinyl alcohol film in the aqueous dyeing solution;
- immersing the dyed polyvinyl alcohol film in an aqueous cross-linking solution containing boric acid and potassium iodide to obtain a cross-linked polyvinyl alcohol film;
- stretching the cross-linked polyvinyl alcohol film in an aqueous stretching solution containing boric acid and potassium iodide to obtain a stretched polyvinyl alcohol film;
- and
- immersing the stretched polyvinyl alcohol film in an aqueous color correction solution containing boric acid, potassium iodide, and a zinc salt.
3 more elements
Dependencies are inferred from the claim text.