JP2005156935A - Composition for optical filter and optical filter material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composition suitable for an optical filter for a plasma display which can effectively shield neon light and remove the influence of fluorescence on image colors and has high durability, and to provide a material of the optical filter. <P>SOLUTION: The composition for the optical filter is characterized by including 0.05-8 weight part of a coloring matter having a maximum absorption wavelength in an area of 620-700 nm in 1 weight part of a cyanic group coloring matter of which the half-value width as a neon light absorbing coloring matter is ≤100 nm. The optical filter material for the display is characterized by containing near infrared absorbing coloring matter in the composition for the optical filter. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical filter composition and a display optical filter material containing the same. Specifically, the present invention relates to a composition that effectively shields neon light generated from a plasma display panel or the like and does not cause adverse effects due to fluorescence, and an optical filter material excellent in durability.

  A plasma display panel (PDP) is used by discharging a gas such as neon between two glass plates and discharging them. At this time, near infrared rays of 800 to 1100 nm are emitted from the PDP, which may cause a malfunction of the near infrared remote controller for home appliances. Usually, a near infrared absorbing filter is used for the PDP. In addition, the emission line spectrum of neon light during discharge is orange light (550 to 620 nm), and when displaying an image with a combination of red, blue, and green light emission, a clear color image is not obtained. Need to be shielded.

  In order to improve the influence of this neon light, for example, a material provided with a coating film containing a dye that selectively absorbs 550 to 620 nm, such as a cyanine dye or a polymethine dye, in a near-infrared absorbing dye, or 550 to 620 nm A material provided with a pressure-sensitive adhesive layer containing a selectively absorbing dye and a coating layer containing a near-infrared absorbing dye is disclosed (Patent Document 1).

Also disclosed is a colored adhesive film for display in which a light-transmitting film is provided with an adhesive layer containing a cyanine-based neon light-absorbing dye, a near-infrared absorbing dye, and carbon black (Patent Document 2).
JP 2002-200711 A JP 2003-82302 A

  However, since the cyanine-based neon light-absorbing dye usually emits fluorescence in the region of 600 to 700 nm, when it is used in a plasma display, it is affected by surrounding lighting (for example, sunlight or fluorescent lamp). However, there is a drawback in that there is an angle dependency in that the display image color varies depending on the viewing angle.

  An object of the present invention is to provide a composition suitable for an optical filter for a plasma display, which effectively shields neon light and is excellent in durability without affecting the image color due to fluorescence, and a material thereof.

  The present invention relates to an anthraquinone dye, a phthalocyanine dye, and triphenyl as a dye having a maximum absorption wavelength in a region of 620 to 700 nm with respect to 1 part by weight of a cyanine dye having a half-value width of 100 nm or less as a neon light absorbing dye. An optical filter composition comprising 0.05 to 8 parts by weight of one or more selected from the group consisting of methane-based dyes.

  In addition, the present invention is an optical filter material for a display, wherein the optical filter composition contains a near-infrared absorbing dye.

  ADVANTAGE OF THE INVENTION According to this invention, the composition suitable for the optical filter for plasma displays excellent in durability which can obtain the display image color without angle dependence can be provided.

  As a result of intensive studies to solve the above problems, the present inventor has found an optimal combination of a dye that can effectively absorb a wavelength of 550 to 620 nm even with a small amount and a dye that can effectively absorb the fluorescence generated by the dye. I found it. That is, by using together a certain amount of dye having a maximum absorption wavelength in the region of 620 to 700 nm, the fluorescence in the region of 620 to 700 nm can also be effectively blocked.

  Generally, a neon light absorbing dye means a dye having a maximum absorption wavelength in the region of 550 to 620 nm, and is a cyanine dye, a squalium dye, a diphenylmethane dye, a triphenylmethane dye, an oxazine dye, or an azine dye. Thiopyrylium dyes, viologen dyes, azo dyes, azo metal complex dyes, bisazo dyes, anthraquinone dyes, phthalocyanine dyes, indigo dyes, azomethine dyes, xanthene dyes, oxonol dyes, etc. .

  In the present invention, among these dyes having a maximum absorption wavelength in the region of 550 to 620 nm, a cyanine dye is preferable because it can shield neon light with a small amount of addition. Specifically, a cyanine dye having a molar extinction coefficient of 50,000 or more, preferably 100,000 or more and a half-value width (the width of a wavelength region showing an absorbance at half the absorption maximum) is 100 nm or less, preferably 50 nm or less. It is. Any cyanine dye that satisfies this condition is preferably used in the present invention. For example, 2- [3- (1,3-dihydro-1,1,3-trimethyl-2H-benz [e] indole-2 -Ilidene) -1-propenyl] -1,1,3-trimethyl-1H-benz [e] indolium iodide, 3-ethyl-2- [3- (3-ethyl-2 (3H) -benzothiazoliri Den) -1-propenyl] benzothiazolium iodide, 3-ethyl-2- [3- (3-ethylnaphtho [2,1-d] thiazol-2 (3H) -ylidene) -1-propenyl] naphtho 2,1-d] thiazolium iodide, 1-ethyl-2- [3- (1-ethylnaphtho [1,2-d] thiazol-2 (1H) -ylidene) -1-propenyl] naphtho [1, 2 d] thiazolium iodide, 1-ethyl-2- [3- (1-ethyl-2 (1H) -quinolinylidene) -1-propenyl] quinolinium iodide, 3-ethyl-2- [3- ( 1-ethyl-4 (1H) -quinolinylidene) -1-propenyl] benzoxazolium iodide and the like. As content, although based on the thickness of the resin layer formed on a transparent base material, 0.03-3 weight part is preferable with respect to 100 weight part of this resin. When the amount of the neon light absorbing dye is more than 3 parts by weight, the neon light shielding effect is increased, but the generated fluorescence increases, which is not preferable. On the other hand, when the amount of the dye is less than 0.03 to 3 parts by weight, a sufficient neon light shielding effect cannot be obtained.

  In the present invention, the dye having the maximum absorption wavelength in the region of 620 to 700 nm is used for the purpose of absorbing the fluorescence emitted by the neon light absorbing dye. Specific examples include anthraquinone dyes, phthalocyanine dyes, triphenylmethane dyes, triarylmethane dyes, and indigo dyes. In the case of the present invention, anthraquinone dyes, phthalocyanine dyes, triphenylmethane dyes having good solubility in resins and solvents, heat-and-moisture resistance, and the like are used alone or in combination.

  Anthraquinone dyes include, for example, C.I. I. Solvent Blue 35 (maximum absorption wavelength 623, 670 nm), C.I. I. Solvent Blue 36 (maximum absorption wavelength 643 nm), C.I. I. Solvent Blue 59 (maximum absorption wavelength 645 nm), C.I. I. Solvent Blue 63 (maximum absorption wavelength 645 nm), C.I. I. Solvent Blue 87 (maximum absorption wavelength 630 nm), C.I. I. Solvent Green 3 (maximum absorption wavelength 642 nm), C.I. I. Solvent Green 20 (maximum absorption wavelength 685 nm), C.I. I. Disperse blue 14 (maximum absorption wavelength 647 nm) and the like can be mentioned. Examples of the phthalocyanine dye include C.I. I. Solvent Blue 67 (maximum absorption wavelength 624, 670 nm), C.I. I. Solvent Blue 70 (maximum absorption wavelength 624, 670 nm) and the like can be mentioned. Examples of the triphenylmethane dye include C.I. I. Solvent Blue 5 (maximum absorption wavelength 627 nm) and the like can be mentioned.

  The amount of the dye having the maximum absorption wavelength in the region of 620 to 700 nm depends on the molar extinction coefficient, but is 0.05 to 8 parts by weight with respect to 1 part by weight of the neon light absorbing dye in the optical filter composition. Is preferable, and 0.3 to 5 parts by weight is more preferable. When the amount is more than 8 parts by weight, the color tone balance of the optical filter is lost, and when the amount is less than 0.05 parts by weight, a sufficient fluorescence suppression effect cannot be obtained.

  The optical filter composition of the present invention is a neon light absorbing dye and a dye having a maximum absorption wavelength in the region of 620 to 700 nm prepared with a solvent and a resin. Solvents include aromatic hydrocarbon solvents such as toluene and xylene, alcohol solvents such as methanol, ethanol and isopropyl alcohol, ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone and cyclohexanone, ethyl acetate, Examples include ester solvents such as butyl acetate, ether solvents such as tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, and diethyl ether. These are used alone or in combination of two or more. Examples of the resin include polyacrylic, polyester-based, polyurethane-based, polycarbonate-based, alicyclic polyolefin-based, polyolefin-based, and polystyrene-based resins. These may be used alone or in combination of two or more. Use. In particular, it is preferable to mix a resin having a water absorption rate of 0.1% or less.

  Moreover, when using the composition for optical filters of this invention for a plasma display, a near-infrared absorption pigment | dye is mix | blended and used. Examples of the near infrared absorbing dye include diimonium dyes, phthalocyanine dyes, dithiol metal complex dyes, benzenedithiol metal complex dyes, cyanine dyes, squalium dyes, and the like. In the case of the present invention, a diimonium dye, a phthalocyanine dye and a dithiol metal complex dye excellent in durability and visible light transmittance are preferable, and it is more preferable to add and use two or more of these.

  Examples of the diimonium dye include CIR-1080, CIR-1081 and CIR-1083 manufactured by Nippon Carlit, Epolight 1117 manufactured by Eporin, IRG-022, IRG-023 and IRG-040 manufactured by Nippon Explosives, and the like. It is done. Examples of the phthalocyanine dye include 800NP, 830NP, 900NP, and 925NP manufactured by Avisia, and eXcolor IR-10A, IR-12, IR-14, 906B, and 910B manufactured by Nippon Shokubai Co., Ltd. Examples of the dithiol metal complex dye include Epolight 3063, Epolight 4019, Epolight 4121, and Epolight 4129 manufactured by Eporin, MIR-101, MIR-111, MIR-121, MIR-102, and MIR-105 manufactured by Midori Chemical. Although the compounding quantity of these pigment | dyes is based on the thickness of the resin layer formed on a transparent base material, about 0.1 to 30 weight% is preferable with respect to this resin. When the amount of the dye is large, the near-infrared shielding effect is increased, but the luminous transmittance is not preferable. Further, when the amount of the dye is small, a sufficient near infrared ray shielding effect cannot be obtained.

  In addition to the dye, resin, and solvent, the optical filter material for display of the present invention includes a dye having a maximum absorption wavelength at 620 nm or less, an ultraviolet absorber, an antioxidant, a heat stabilizer, and a leveling agent as necessary. Various additives such as can be added.

  As the optical characteristics of the optical filter for display, in the visible light region, the transmittance around 590 nm necessary for shielding neon light is 50% or less, preferably 30% or less. In the near infrared region, the transmittance of 800 to 1100 nm is preferably 15% or less, and more preferably 10% or less.

  Further, such an optical filter is preferably an achromatic color, and the chromaticity coordinates of the C light source standard calculated according to JIS Z 8701 corresponding to this are (x, y) = (0.310, 0316). Therefore, it is preferable that (x, y) = (0.310 ± 0.100, 0316 ± 0.100). Further, the luminous average transmittance Y is preferably 45% or more.

  As the transparent substrate, a resin film is generally used. Specifically, poly (meth) acrylic resins such as polymethyl methacrylate, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, triacetyl cellulose, and polycarbonate resins. , Polyolefin resins, polystyrene resins and the like.

  The coloring composition for optical filters can be applied to a transparent substrate by a coating method such as a dipping coating method, a spray coating method, a bar coating method, a roller coating method, or a gravure coater method.

  Hereinafter, the present invention will be described in detail, but the present invention is not limited to these examples.

  The evaluation was carried out by the following method.

(1) Measurement of transmission spectrum Using a spectrophotometer (manufactured by Shimadzu Corporation, model UV-3150), the transmission spectrum of the obtained film was measured, and the neon light absorption effect was a transmittance at 590 nm. The infrared absorption effect is confirmed by the transmittance at 800 to 1100 nm.

(2) Evaluation of angle dependence Chromaticity coordinates (x, y) were measured with a spectrophotometer during the above transmission spectrum measurement (based on JIS Z 8701). The chromaticity coordinates when the measurement angle is 0 ° and when shifted by 45 ° are (x0, y0) and (x45, y45), respectively, and the difference between x0 and x45 and the difference between y0 and y45 are both ± When it was 0.100 or less, it was marked as ◯, and when it exceeded ± 0.100, it was marked as x.

(3) Evaluation of heat and humidity resistance The film after the above evaluation was subjected to an exposure test for 100 hours at a temperature of 80 ° C. and a relative humidity of 95%. Similarly, the chromaticity coordinates (x, y) and the luminous average transmittance Y were determined. Measured (based on JIS Z 8701), and the rate of change was calculated by the following formula. When the value was less than 5%, it was evaluated as ◯.
| Value after wet heat resistance test -value before wet heat resistance test | ÷ value before moisture heat resistance test × 100

[Example 1]
10 parts by weight of acrylic resin (product name Acripet, manufactured by Mitsubishi Rayon Co., Ltd.), 0.04 parts by weight of anthraquinone dye (CI Solvent Blue 36, maximum absorption wavelength 643 nm), cyanine dye (Hayashibara Biochemical Laboratories, product) No. NK-2610) 0.03 part by weight was dissolved in 85 parts by weight of methyl ethyl ketone to prepare an optical filter composition, which was applied on a polyester film to a thickness of 8 μm.

  Table 1 shows the results of evaluating the film dried at 100 ° C. for 10 minutes.

[Examples 2-6, Comparative Examples 1-3]
A composition for an optical filter was prepared in the same manner as in Example 1, except that 10 parts by weight of an acrylic resin (product name Acripet, manufactured by Mitsubishi Rayon Co., Ltd.) and 85 parts by weight of methyl ethyl ketone as a solvent were the same. The results of evaluating the films are shown in Table 1.

  In the optical filters for displays of Examples 1 to 6, the values of the luminous average transmittance Y and the chromaticity coordinates (x, y) are 45% or more, and (x, y) = (0.310 ± 0.100, 0316 ± 0.100) It was within the target value. Moreover, it confirmed that the transmittance | permeability of 590 nm was 30% or less. Therefore, it can be seen that the present invention can provide an optical filter for display having no angle dependency and good heat-and-moisture resistance.

  On the other hand, in Comparative Example 1, the difference between y0 and y45 exceeded ± 0.100, and the difference in chromaticity depending on the angle of the optical filter for display was confirmed. Moreover, in the comparative example 2, the change rate of (x, y) exceeded 5%, and it was inferior to heat-and-moisture resistance. Further, in Comparative Example 3, the target chromaticity coordinate (x, y) = (0.310 ± 0.100, 0316 ± 0.100) was not satisfied, and it was unsuitable as an optical filter for display.

[Examples 7 and 8]
In the same composition as in Examples 1 and 5, 0.1 parts by weight of a dithiol metal complex dye (Epolight 3063, manufactured by Eporin) and a diimonium dye (product name CIR-1080, manufactured by Nippon Carlit) 0.3 as a near-infrared absorber at the time of preparation A part by weight was added to form a film in the same manner as in Example 1. As a result of measuring the transmission spectrum of the obtained film and evaluating the near-infrared absorbing ability, the transmittance at 800 to 1100 nm was 10% or less, and the near-infrared absorbing effect was good.

Claims (2)

  From anthraquinone dyes, phthalocyanine dyes and triphenylmethane dyes as dyes having a maximum absorption wavelength in the region of 620 to 700 nm with respect to 1 part by weight of a cyanine dye having a half width of 100 nm or less as a neon light absorbing dye An optical filter composition comprising 0.05 to 8 parts by weight of at least one member selected from the group consisting of:   An optical filter material for a display, wherein the composition for optical filter according to claim 1 contains a near-infrared absorbing dye.