Polarizer, optical film, and image display
AssigneeNitto Denko Corporation
InventorsMinoru Miyatake, Takashi Kamijo
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Abstract
The polarizer of the present invention is a polarizer comprising a film having a structure having a minute domain dispersed in a matrix formed of a translucent thermoplastic resin including an absorption dichroic dye, wherein a transmittance to a linearly polarized light in a transmission direction is 80% or more, a haze value is 10% or less , and a haze value to a linearly polarized light in an absorption direction is 50% or more. The polarizer of the present invention is a dye-based polarizer having a high transmittance and a high polarization degree, capable of suppressing unevenness of transmittance in black display and excellent in reliability in heat resistance.
Claims32
A polarizer comprising a film having a structure having a minute domain dispersed in a matrix formed of a translucent thermoplastic resin including an absorption dichroic dye, wherein
- a transmittance to a linearly polarized light in a transmission direction is 80% or more,
- a haze value is 10% or less,
- a haze value to a linearly polarized light in an absorption direction is 50% or more,
- the translucent thermoplastic resin is a polyvinyl alcohol, and
- the minute domain is formed of an oriented birefringent material that shows liquid crystalline at least in orientation processing step, wherein the birefringent material forming the minute domain is a liquid crystalline thermoplastic resin showing up a state of a nematic phase or a smectic phase in a temperature region lower than a glass transition temperature of the translucent thermoplastic resin.
A polarizer comprising a film having a structure having a minute domain dispersed in a matrix formed of a translucent thermoplastic resin including an absorption dichroic dye, wherein
- a transmittance to a linearly polarized light in a transmission direction is 80% or more, a haze value is 10% or less,
- a haze value to a linearly polarized light in an absorption direction is 50% or more,
- the translucent thermoplastic resin is a polyvinyl alcohol, and
- the minute domain is formed of an oriented birefringent material that shows liquid crystalline at least in orientation processing step, wherein the birefringent material forming the minute domain is a product obtained by polymerization after aligning a liquid crystalline monomer showing up a state of a nematic phase or a smectic phase in a temperature region lower than the glass transition temperature of the translucent thermoplastic resin.
Dependencies are inferred from the claim text.