JPS6274963A - Dye for green filter and preparation of said filter - Google Patents

Abstract

NEW MATERIAL:A dye of the formula (wherein R1-10 are each H or an alkyl). USE:A green dye for a filter having excellent processability in forming a filter, such as sublimation coloring characteristics and heat resistance, excellent spectral properties and excellent durability. PREPARATION:For example, 5,8-diamino-1,4-naphthoquinone or 1,4,5,8- tetrahydroxynaphthalene is reacted in the presence of a reducing agent, such as an alkali or hydrosulfite, with an aniline derivative to give an objective dye. The surface of a transparent base material, such as glass or a polymethyl acrylate resin, is covered with a mask having an opening only where green coloring is to be performed, and the dye is sublimed under reduced pressure to deposit on the surface of the base material, thus producing a green filter.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a green dye for optical filters and a green filter using the dye.

Conventional technology and problems to be solved TV camera,
Filters using gelatin as a substrate are known as optical filters required for liquid crystal televisions, flat panel displays mounted on computers, and the like. (For example, JP-A-59-182408.59-101607, etc.) However, gelatin-based filters do not have good durability. In addition, as is well known, the filter must have a pattern of the three primary colors of red, green, and blue, and in order to create this pattern in a gelatin-based filter, it is necessary to repeat the resist. This was a major manufacturing defect. In order to improve durability, a resist method using vacuum evaporation using fluorine-containing methacrylate as a base material is being considered. (Unexamined Japanese Patent Publication No. 59-127036)
This method also uses a resist, making the filter difficult to process and expensive, and since a perylenetetracarboxylic acid derivative is used as the dye, the sublimation deposition temperature is extremely high < (300°C or higher, pressure 10-' to 10-') tor
r) Workability was poor.

The present invention provides a green pigment necessary for producing optical filters at low cost, and uses the green pigment to
The purpose is to provide a method for manufacturing optical filters at low cost.

Means for Solving the Problems The present invention provides a green dye for filters represented by the following formula 〇) [Formula (Il rtl R- to lR+o each independently represents a hydrogen atom or an alkyl group.] The present invention relates to a method for manufacturing a filter, characterized in that a filter base material is colored by sublimation or sublimation transfer of a dye.

The method for producing the dye of the present invention is a method for producing the dye of the present invention.
, 4-naphthoquinone or 1.4.5.8-tetrahydroxynaphthalene is reacted with an aniline derivative in the presence of an alkali and a reducing agent such as hydrosulfide.

In addition, as filter base materials, glass, resin Kohlang glass, alumina gel fired glass (for example, Japanese Patent Application Laid-open No. 5
8-20491) Transparent base materials such as polymethyl methacrylate resin, polycarbonate resin, and diethylene glycol bisallyl carbonate resin are preferred.

A method for producing a filter using the dye of formula (I) is to cover the surface of the profiteer with a mask that has holes only in the areas to be colored green, and sublimate and vapor deposit the dye under reduced pressure, or to apply the dye necessary for the filter. In addition, the general formula (R° ~ RI of Il
The alkyl group represented by G means a straight chain or branched alkyl group having 1 to 20 carbon atoms.

Effects of the Invention The green dye-based filter processability for the filter of the present invention (
The table shows the characteristics regarding quality (spectral characteristics) and durability (heat resistance, light resistance) as a filter (sublimation coloring property, heat resistance). (◎Remarkably excellent. ○Excellent.×Remarkably poor.) Ji' RI6 (Note-1) Colorability is determined by applying alumina gel to fired glass and polymethyl methacrylate transparent resin plate under normal pressure. The color strength was determined when sublimation transfer was performed at 200°C.

◎Very good ○Colored × Not colored (Note-2) Heat resistance is determined by the change in transmission spectrum before and after treatment when treated at 170℃ under atmospheric pressure for 4 hours.No change within 010% within 030%△ 30 % or more, 1 unit × (Note-3) A fade meter test (63°C) of the fabricated filter was conducted to determine the change in transmission spectrum before and after 20 hours of treatment (irradiation from the glass surface with a glass base material) No change 010 Within % 0 Within 30% △ 30% or more 0160°C if below ℃~0200° if 200°C
If the temperature is between C and 240°C, it is △. If it is 240°C or higher, it is marked as ×.

(Note-5) 5 of the prototype filter made in the same way as Example-1
The transmittance at 50 nm was 60% or more, 0 was 60-30%, and 0 was 30% or less.

(Note-6) Items that cannot be measured due to sublimation transfer and are not colored are indicated by -.

[Example-1] In the table, 10 parts of dye number 1 was mixed with 100 parts of polypropylene glycol, and after making it into fine particles, it was applied to paper and dried to make a transfer paper, which was coated with alumina gel and baked to a thickness of 3.
It was transferred onto a 200 mm glass plate at 200°C and a green filter was attached. Figure 1 shows a chart of the spectral characteristics (transmittance) of this filter measured using a spectrophotometer.

[Example-2] A green filter was made in the same manner as in Example-1 using the dye No. 2 in the table. Figure 2 shows the spectral characteristics of the #≠Weekday.

[Example 3] A green filter was made in the same manner as in Example 1 using the dye of front dye number 5. The spectral characteristics are shown in Figure 3.

[Brief explanation of drawings]

Figures 1, 2, and 3 show the transmittance measured by a spectrophotometer at each wavelength of the filters prepared in Examples 1, 2, and 3 using the dyes according to the present invention. FIG.

Claims (1)

[Claims] 1. The following formula (I) ▲ Numerical formulas, chemical formulas, tables, etc. ▼ (I) [In formula (I), R_1 to R_1_0 each independently represent a hydrogen atom or an alkyl group. ] Green dye for filters. 2. The following formula (I) ▲ Numerical formulas, chemical formulas, tables, etc. are available ▼ (I) [In formula (I), R_1 to R_1_0 each independently represent a hydrogen atom or an alkyl group. ] A method for producing a filter, which comprises sublimating or sublimation-transferring a green dye shown in the formula to color a transparent glass or transparent resin filter base material.