Compositions – Light transmission modifying compositions – Producing polarized light
Patent
1986-09-08
1989-02-07
Thexton, Matthew A.
Compositions
Light transmission modifying compositions
Producing polarized light
8658, 350397, G02B 530
Patent
active
048030147
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a high-performance light-polarizing film having a neutral gray in which iodine and a dichroism dye are used as polarizing coloring matter.
BACKGROUND OF THE INVENTION
At the present time, light-polarizing films are usually produced by the adsorption of polarizing coloring matter, such as iodine or dichroism dye, into a stretched and oriented film made of polyvinyl alcohol or its derivative or into an oriented polyene film prepared by dehydrochlorinating a polyvinyl chloride film or dehydrating a polyvinyl alcohol film to form a polyene film and then orienting the polyene film.
As for the performances of light-polarizing film, light-polarizing films having a high light-transmittance of single polarizer and a high polarizing co-efficient and showing a uniform light transmittance of single polarizer and a uniform polarizing co-efficient over the whole wavelength range of visible light, i.e. 400 nm to 700 nm, are desirable.
Among the light-polarizing films, those in which iodine is used as polarizing coloring matter show a uniform light transmittance (this means that the film assumes a neutral gray) over the whole wavelength range of visible light, i.e. 400 nm to 700 nm, and show a relatively uniform and high polarizing co-efficient, when the degree of dyeing is high, i.e. when light transmittance of single polarizer is low. However, when the degree of dyeing is low, i.e. when the light transmittance of single polarizer is high, the light transmittance cannot be uniform (in other words, neutral gray cannot be assumed) over the whole wavelength range of visible light (400 nm to 700 nm) and the polarizing co-efficient is low and dependent on wavelength. In this case, the absorption characteristics and polarization characteristics are particularly bad in the low wavelength region (400-500 nm) and high wavelength region (600-700 nm). Thus, in this case, light transmittance of single polarizer is higher and polarizing co-efficient is lower in said low and high wavelength regions than in other wavelength regions.
On the other hand, light-polarizing films in which a dichroism dye is used as polarizing coloring matter can show no constant light transmittance over the whole wavelength range of visible light (400-700 nm) and their polarizing co-efficient is irregular and dependent on wavelength, regardless of the degree of dyeing.
DISCLOSURE OF THE INVENTION
In view of the above-mentioned state of things, the present inventors conducted elaborated studies to find that a high-performance light-polarizing film assuming a neutral gray can be obtained by using a mixture of iodine and a dichroism dye as polarizing coloring matter and adsorbing and orienting the polarizing coloring matter in a polymer film. Based on this finding, the present invention was accomplished.
Thus, the present invention relates to a high-performance light-polarizing film having a neutral gray produced by adsorbing and orienting iodine and specified organic direct dye, either separately or in the form of a mixture, as polarizing coloring matter in a hydrophilic polymer film, wherein said specified organic direct dye is composed of an organic direct dye which shows adsorption characteristics and polarization characteristics in the low wavelength region in the whole wavelength range of visible light (400 nm to 700 nm), and shows, when adsorbed and oriented in a polymer film, a direction of transition moment substantially identical with that of iodine and/or an organic direct dye which shows absorption characteristics and polarization characteristics in the high wavelength region in the whole wavelength range of visible light and shows, when adsorbed and oriented in a polymer film together with iodine, a direction of transition moment substantially identical with that of iodine. The object of the present invention consists in providing a high-performance light-polarizing film assuming a neutral gray and having a high light-transmittance of single polarizer and a high polarizing co-efficient in the
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Kikui Hitoshi
Okada Toyokazu
Okumura Takuzo
Kilby Catherine S.
Sumitomo Chemical Company Limited
Thexton Matthew A.
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