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Near-infrared transmitting black azo-dye

An azo pigment and permeability technology, used in azo dyes, monoazo dyes, organic dyes, etc., can solve problems such as poor electrical insulation, unsuitable for coloring electronic components, and inability to improve, to prevent Illegal copying, temperature rise prevention effect

Inactive Publication Date: 2002-07-31
DAINICHISEIKA COLOR & CHEM MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of carbon black and aniline black are that their electrical insulation is not good, and they are not suitable for the coloring of electronic components. Although they absorb light from the ultraviolet region to the far infrared region, they are generally used in various color coatings. used as black pigment
These properties are intrinsic to the pigments themselves and cannot be modified

Method used

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  • Near-infrared transmitting black azo-dye
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  • Near-infrared transmitting black azo-dye

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 3.75 parts (0.01 mol) of the compound represented by the above formula (2) were suspended in 11.3 parts of glacial acetic acid, and 3.7 parts of concentrated hydrochloric acid were added to the suspension, followed by stirring. Add 2.6 parts of water, keep the temperature at 0-5°C, add 2.0 parts of 40% sodium nitrite aqueous solution, and then stir at the same temperature for 30 minutes to obtain a yellow diazonium salt. Add 4.8 parts of sodium acetate trihydrate to the solution to prepare a diazonium salt solution.

[0042] On the other hand, 3.56 parts (0.009 mol) of the compound of general formula (3) wherein the phenyl has a substituent R of 2'-methyl-4'-methoxyphenyl is suspended in 250 parts of o-dichlorobenzene , Add the above-mentioned diazonium salt solution at 20-30°C to the suspension at 30-40°C, and then add 20 parts of glacial acetic acid. At the same time, the temperature was maintained for 5-6 hours for coupling, and then the reaction mixture was heated ...

Embodiment 2

[0045] 3.75 parts (0.01 mol) of the compound of the above formula (2) were suspended in 11.3 parts of glacial acetic acid, and 3.7 parts of concentrated hydrochloric acid were added thereto, followed by stirring. 2.6 parts of water were added to the obtained solution, and the temperature of the thus obtained mixture was kept at 0 to 5° C., and 2.0 parts of 40% sodium nitrite aqueous solution was added, followed by stirring at the same temperature for 30 minutes to obtain a yellow diazonium salt solution. To this solution, 4.8 parts of sodium acetate trihydrate was added to prepare a diazonium salt solution.

[0046] On the other hand, 2.77 parts (0.007 moles) of the compound of the above general formula (3) wherein the substituent R of the phenyl group is 2'-methyl-4'-methoxyphenyl and the substituent R of the phenyl group 1.53 parts (0.004 moles) of the compound of the above-mentioned general formula (3) in which R is 4'-methoxyphenyl is suspended in 250 parts of o-dichlorobe...

example 2

[0062] The above-mentioned coatings 1, 3 and 4 were respectively coated on an alumina plate (150mm×70mm×0.1mm) with a strip coater No.40, and dried by a known method in the prior art to make three kinds of black coatings 1 , 3 and 4. The above-mentioned 3 kinds of black smears 1, 3 and 4 are placed on the temperature rise test device made of foamed styrene, and each test piece is irradiated with light (250W infrared lamp) from the place 400mm away from the test board, and the test pieces are placed at 1, 3 and 4 respectively. 5, 10, 20 and 30 minutes to measure the temperature on the surface of the test piece and in the tank. The test results are shown in Table 3. Use the paint that contains the pigment of the present invention, the obtained smear 1, its transmittance of infrared rays is bigger than smear 3 and 4, thereby cause the reflection of aluminum oxide base plate to be big, compare with smear 3 and 4, smear 1 The surface temperature and the temperature in the tank ar...

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Abstract

Near-infrared transmitting black azo pigments are represented by the following formula (1) and have a crystalline form selected from the group consisting of a thin, long crystalline form and a leaf-shaped crystalline form, wherein R represents at least one group selected from the group consisting of lower alkyl groups having 1 to 3 carbon atoms and lower alkoxy groups having 1 to 3 carbon atoms, n stands for an integer of from 1 to 5, and, when n is other than 1, R may be the same or different. These near-infrared transmitting black azo pigments can be produced by treating the corresponding black azo pigments of the formula (1) with an alkali in an alcohol. Near-infrared transmitting black azo pigments compositions each comprises one or more of the near-infrared transmitting black azo pigments and a near-infrared transmitting material as a vehicle.

Description

Background of the invention [0001] The invention relates to a near-infrared transparent black azo pigment and a black azo pigment composition containing the same. The term "near infrared" as used refers to light having a wavelength of 800 to 2000 nm. [0002] current technology [0003] Carbon black, aniline black, iron oxide black, etc. have been used as black pigments for many years. These pigments absorb light of wavelengths from the ultraviolet region to the far infrared region, have no transmittance to near infrared light, and tend to absorb infrared rays, that is, heat waves. Therefore, materials colored with these pigments become hot under the action of direct sunlight. When these ordinary black pigments are used as colorants in electronic components and coatings, their electrical insulation is poor. [0004] In recent years, on the other hand, due to the increase in the number of fields such as the development of lasers, especially the deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/10C09B29/01C09B29/09C09B29/36C09B67/00
CPCC09B29/3604C09B67/0029C09B29/0011C09B67/0014
Inventor 座间义之冈本久男柳本宏光山宫士郎阿部好夫中村道卫
Owner DAINICHISEIKA COLOR & CHEM MFG CO LTD
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