Dichroic polarizing film and optical polarizer containing the fi

Details Dichroic polarizing film and optical polarizer containing the fi Dichroic polarizing film and optical polarizer containing the fi

1998-01-13

2000-09-05

Yoon, Tae

Compositions

Light transmission modifying compositions

Producing polarized light

524503, 524603, 525 58, 428 1, 428221, G02C 712, G02B 530, C08L 2904, C09K 1952

Patent

active

061138118

ABSTRACT:
A dichroic polarizing film is made, for example, by, first combining polyvinyl alcohol and a second polymer, such as, polyvinyl pyrrolidone or a sulfonated polyester, in a solvent. The ratio of polyvinyl alcohol to second polymer is between about 5:1 to 100:1 by weight. The film is coated on a substrate, dried, and then stretched to orient at least a portion of the film. The film incorporates a dichroic dye material, such as iodine, to form a dichroic polarizer. This polarizer may be used in conjunction with a multilayer optical film, such as a reflective polarizer, to form an optical polarizer. The multilayer optical film may contain two or more sets of polyester films, where at least one of the sets is birefringent and orientable by stretching. The polyvinyl alcohol/second polymer film and the multilayer optical film may be simultaneously stretched to orient both polymer films.

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