JP2543051B2 - Color filter manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a color filter using a pigment-based dye, and more particularly to improvement of a green dye layer.

2. Description of the Related Art Color filters are used in liquid crystal color displays, liquid crystal color televisions and the like. As the color material for the color filter, one having good light resistance and spectral characteristics equivalent to that of CRT is preferable.

In general, pigments are more commonly used because they have better light resistance than dyes. A phthalocyanine dye is used for the green dye layer. However, the phthalocyanine-based dye alone cannot be used as a green dye layer for a color filter because the maximum transmission value is around 500 nm.

Therefore, it has been proposed to use a phthalocyanine dye and an isoindolinone yellow dye together. (JP Sho
(Problems to be solved by the invention) However, the spectral characteristics of the green pigment layer obtained by the combination of the phthalocyanine pigment and the isoindolinone yellow pigment are inferior to those of the CRT, and the CIE chromaticity diagram is shown. The color reproducibility of is also poor.
It is considered that this is because the isoindolinone yellow dye cannot sufficiently cut the blue component of the phthalocyanine dye.

Means for Solving the Problems In order to obtain a color filter having excellent color reproducibility of the green dye layer, the disazo yellow dye is added to the halogenated phthalocyanine dye 100 in a weight ratio of 5 to 5 on the transparent substrate. Five
It is formed by printing a photo-curable resin or a mixture of a photo-curable resin and a thermosetting resin that is contained in a ratio of 0, and has a transmittance of 10% or less with a transmittance of 500 nm or less and 600 nm or more. Provided is a method for manufacturing a color filter having a green dye layer.

Action The disazo yellow dye sufficiently cuts the blue component of the halogenated phthalocyanine dye, and the transmission maximum of the halogenated phthalocyanine dye is around 550 nm, so it is presumed that spectral characteristics equivalent to CRT can be obtained. It

Example A method for producing a color filter of the present invention is a photocurable resin or a photocurable resin containing a disazo yellow dye in a ratio of 5 to 50 with respect to 100 halogenated phthalocyanine dye in a weight ratio on a transparent substrate. And printing a mixture of a thermosetting resin as a green layer.

Representative examples of the halogenated phthalocyanine dye used in the present invention include CI Pigment Green 36 (CI74265).

Examples of the disazo yellow dye used in the present invention include Pigment Yellow 81 (PY81), PY81, PY87, PY93,
Examples include PY94.

The amount of the disazo yellow dye is preferably 5 to 50 based on 100 parts by weight of the halogenated phthalocyanine dye. When the amount of the disazo yellow dye exceeds the above range, the transmittance of 650 nm to 700 nm becomes 10% or more. On the other hand, if the amount is less than the above range, the blue component of the halogenated phthalocyanine dye cannot be sufficiently cut, resulting in poor color reproducibility.

Examples of the photocurable resin used in the present invention include oligoester acrylate, urethane acrylate and epoxy acrylate. Examples of the thermosetting resin include rosin-modified phenol resin, coumarone-indene resin, petroleum resin, alkyd resin, epoxy resin and cyclized rubber.

The mixing ratio of the thermosetting resin to the photocurable resin is 0 to
30wt% is good. When the amount of the thermosetting resin exceeds this range, the photopolymerization reaction is hindered.

In forming the green pigment layer by printing, a printing method such as an offset printing method, a screen printing method, a transfer printing method or a letterpress printing method can be used.

Example 1 54 g of halogenated phthalocyanine (Pigment Green36),
6 g of disazo yellow dye (Pigment Yellow83), 9 g of photo-curing agent (Darocur 1173, made by Merck) and oligoester acrylate (Aronix M-8060, made by Toagosei Kagaku)
After adding 300 g and stirring well, the pigment was dispersed 5 times on 3 rolls. The obtained dispersion was printed on a glass plate with a pattern of 50 × 50 mm to a thickness of 1 μm by an offset printing machine, and then irradiated with ultraviolet rays (200 mJ / cm 2) to cure the film.

Example 2 42 g of halogenated phthalocyanine (Pigment Green36),
18 g of disazo yellow dye (Pigment Yellow83) and 9 g of photo-curing agent (Darocur 1173, manufactured by Merck) were added to 300 g of oligoester acrylate (Aronix M-8060, manufactured by Toagosei Kagaku Co., Ltd.), and the mixture was stirred well and then 5 times in 3 rolls. To disperse the pigment. The obtained dispersion was printed on a glass plate with a pattern of 50 × 50 mm to a thickness of 1 μm by an offset printing machine, and then irradiated with ultraviolet rays (200 mJ / cm 2) to cure the film.

Example 3 57 g of halogenated phthalocyanine (Pigment Green36),
3 g of disazo yellow dye (Pigment Yellow83), 8 g of photo-curing agent (Darocur 1173, made by Merck) and oligoester acrylate (Aronix M-8060, made by Toagosei)
The mixture was added to a mixture of 270 g and 30 g of rosin-modified p-tert-butylphenol resin, stirred well, and then the pigment was dispersed over three rolls five times. The obtained dispersion is printed on a glass plate with a 50 × 50 mm pattern with a thickness of 1 μm by an offset printing machine, and then irradiated with ultraviolet rays (200 mJ / cm2) to cure the film, and further heated at 100 ° C. for 30 minutes. did.

Comparative Example 1 In Example 1, the dye was halogenated phthalocyanine.
A sample was prepared with a pigment dispersion containing 60 g and containing no disazo yellow dye.

Comparative Example 2 In Example 1, the dye was a copper phthalocyanine dye (Pi
gment Blue15) 54g and isoindolinone yellow pigment (C.
I. Pigment yellow110) 6g was used as a sample.

Samples of Examples 1 to 3 and Comparative Examples 1 and 2 were cut into a size of 24 × 40 mm, and 400 to 70 with a spectrophotometer (UV-260, made by Shimadzu).
Measure the transmission spectrum in the 0 nm range, and
The IE chromaticity coordinates were calculated.

FIG. 1 is a plot of each CIE chromaticity coordinate. In the figure, the solid line indicates the color reproduction range of the CRT. The light source is a three-wavelength emission type fluorescent lamp (Palook, manufactured by Matsushita Electric)
Was used.

As can be seen from FIG. 1, the coordinates of the comparative example are separated from the green of the CRT on the CIE chromaticity diagram, but the coordinates of the embodiment of the present invention are near the green of the CRT, and the color filter of the invention is You can see that the color reproducibility is good.

FIG. 2 shows transmission spectra of Example 1 and Comparative Example 1 at 400 to 700 nm. When the halogenated phthalocyanine is used alone (Comparative Example 1), the absorption maximum is at 548 nm, but it contains a blue component. It can be seen that by mixing the disazo yellow dye of the present invention in an amount of 11 wt% with respect to the halogenated phthalocyanine (Example 1), the absorption maximum hardly changed to 552 nm and the blue component of 500 nm or less could be cut.

Effect of the Invention A green dye layer is formed by printing a transparent resin containing a disazo yellow dye in a ratio of 5 to 50 with respect to 100 parts by weight of a halogenated phthalocyanine dye on a transparent substrate to form a green dye layer. It is possible to provide a method for producing a color filter having excellent color reproducibility.

[Brief description of drawings]

FIG. 1 shows color filters of an embodiment of the present invention and a conventional example.
The CIE chromaticity diagram and FIG. 2 are transmission spectrum diagrams of the color filter.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kimiaki Yoshino 1006 Kadoma, Kadoma-shi, Matsushita Electric Industrial Co., Ltd. (72) Inventor Tokihiko Shimizu 1006 Kadoma, Kadoma-shi, Matsushita Electric Industrial (56) References JP-A-56-54444 (JP, A) JP-A-60-237403 (JP, A) JP-A-60-237441 (JP, A)

Claims (1)

(57) [Claims] 1. A photo-curable resin or a photo-curable resin and a thermosetting resin containing, on a transparent substrate, a disazo yellow dye in a proportion of 5 to 50 with respect to 100 halogenated phthalocyanine dyes on a transparent substrate. Print and form a mixture with 50
A method for producing a color filter having a green dye layer having an optical characteristic of a transmittance of 10% or less at a wavelength of 0 nm or less and a wavelength of 600 nm or more.