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Problems solved by technology
Among them, the dye-based polarizing plate has high heat resistance, high humidity and heat durability, high stability, and has the characteristics of high selectivity of color based on compounding. On the other hand, in the same polarization degree Compared with the polarizers of iodine-based polarizers, dye-based polarizers have the problem of low transmittance, that is, low contrast
Method used
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example 1
[0065] 【Chemical 5】
[0066]
[0067] [Compound Example 2]
[0068] 【Chemical 6】
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[0070] [Compound Example 3]
[0071] 【Chemical 7】
[0072]
[0073] [Compound Example 4]
[0074] 【chemical 8】
[0075]
[0076] [Compound Example 5]
[0077] 【Chemical 9】
[0078]
[0079] [Compound Example 6]
[0080] 【chemical 10】
[0081]
[0082] [Compound Example 7]
[0083] 【chemical 11】
[0084]
[0085] [Compound Example 8]
[0086] 【Chemical 12】
[0087]
[0088] [Compound Example 9]
[0089] 【Chemical 13】
[0090]
[0091] [Compound Example 10]
[0092] 【Chemical 14】
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example 11
[0095] 【chemical 15】
[0096]
[0097] [Compound Example 12]
[0098] 【Chemical 16】
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[0100] [Compound Example 13]
[0101] 【Chemical 17】
[0102]
[0103] [Compound Example 14]
[0104] 【chemical 18】
[0105]
[0106] [Compound Example 15]
[0107] 【chemical 19】
[0108]
[0109] [Compound Example 16]
[0110] 【chemical 20】
[0111]
[0112] [Compound Example 17]
[0113] 【Chemical 21】
[0114]
[0115] [Compound Example 18]
[0116] 【Chemical 22】
[0117]
[0118] The azo compound used as a dye in the present invention can usually be produced by the following steps using a well-known synthesis method in the technical field. First, make the following formula
[0119] 【Chemical 23】
[0120]
[0121] The compound (in the formula, A represents the same meaning as the situation of the above-mentioned formula (I)) with the stilbene structure represented) and
[0122] 【Chemical 24】
[0123]
[0124] Represented compounds (where R...
Embodiment
[0150] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited by these examples. In addition, the evaluation of the transmittance shown in an Example was performed as follows.
[0151] The respective transmittances were measured using a spectrophotometer ["U-4100" manufactured by Hitachi, Ltd.].
[0152] When the transmittance is measured using a spectrophotometer [manufactured by Hitachi, Ltd. "U-4100"], the transmittance after correction of the sensitivity based on JIS-Z8701 (C light source 2° field of view) is set on the light emitting side to 43 % and an iodine-based polarizer (SKN-18043P manufactured by Polatechno Co., Ltd.) with a polarization degree of 99.99%, so that absolutely polarized light can enter the measurement sample. The protective layer of the iodine-based polarizing plate at this time is triacetyl cellulose which does not have ultraviolet absorbing ability.
[0153] Absolutely polar...
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PUM
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Abstract
The present invention provides a polarizing element and a polarizing plate having improved optical characteristics and durability. A polarizing element, characterized in that it is composed of a polyvinyl alcohol resin film, the polyvinyl alcohol resin film has a degree of polymerization of 5000 to 10000, and the polyvinyl alcohol resin film adsorbs a compound selected from formula (I) , its salt and at least one dichroic dye in its transition metal complex and stretched. (In the formula, A represents a nitro group or an amino group, R1 and R2 each independently represent a hydrogen atom, a hydroxyl group, a lower alkyl group, a lower alkoxy group, a sulfo group or a lower alkoxy group with a sulfo group, and X represents whether it has Any one of benzamido with or without substituents, phenylamino with or without substituents, phenylazo with or without substituents, or naphthotriazolyl with or without substituents, the The substituent is lower alkyl, lower alkoxy, sulfo, amino or substituted amino.)
Description
technical field [0001] The present invention relates to dye-based polarizing elements and polarizers. Background technique [0002] A polarizing element is generally produced by adsorbing iodine or a dichroic dye as a dichroic dye on a polyvinyl alcohol resin film and aligning it. A protective film made of triacetyl cellulose or the like is bonded to at least one side of the polarizing element via an adhesive layer to form a polarizing plate, which is used in a liquid crystaldisplay device or the like. A polarizing plate using iodine as a dichroic dye is called an iodine-based polarizing plate, and a polarizing plate using a dichroic dye as a dichroic dye is called a dye-based polarizing plate. Among them, the dye-based polarizing plate has high heat resistance, high humidity and heat durability, high stability, and has the characteristics of high selectivity of color based on compounding. On the other hand, in the same polarization degree Compared with the polarizing pla...
Claims
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