JPS60133069A - Ultraviolet curing semiconducting coating material composition - Google Patents

Abstract

PURPOSE:The titled composition, obtained by incorporating a coating material base containing an epoxy resin and a Lewis acid salt decomposable with ultraviolet light with carbon black in a specific proportion, curable easily with the ultraviolet light, having improved adhesiveness to a base material and heat resistance, and useful for electronic apparatuses, etc. CONSTITUTION:An ultraviolet curing semiconducting coating material composition obtained by incorporating (A) 100pts.wt. coating material base obtained by mixing (i) epoxy resin with (ii) a Lewis acid salt, e.g. p-methoxybenzenediazonium hexafluorophosphate with (B) 5-50pts.wt. carbon black. The resultant base material is applied to a base material and then cured by irradiation with ultraviolet light using an ultraviolet lamp at 50-200w/cm<2> for 10-60sec.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention is easily cured by ultraviolet rays, has semiconductivity,
The present invention also relates to an ultraviolet curable semiconductive coating composition that can form a semiconductive coating film with excellent adhesion to a substrate and excellent heat resistance.

[Background of the invention]

In recent years, electron beam or ultraviolet curable paints have been used instead of conventional hardening agent-based paints in forming semiconductive circuits for electronic device parts, semiconducting electrical shielding, and adhesive coatings. is being considered. Electron beam or ultraviolet ray curable paints can be rapidly cured by irradiation with electron beams or ultraviolet rays, so the manufacturing process can be streamlined.

The present inventors have obtained a semiconductive coating composition that is easily cured by electron beams or ultraviolet rays, has semiconductivity, and can form a semiconductive coating film that has excellent adhesion to profiteering and heat resistance. For this purpose, we conducted intensive research.

As a result, a coating film was applied using a coating composition made by adding carbon black to an electron beam curable resin, and the coating film was cured by irradiating it with an electron beam. We have found a way to accomplish this. Even if the coating film is cured using electron beams, the effects of speeding up curing and streamlining the manufacturing process will not be compromised. It's a hassle compared to the facilities.

However, in semiconductive coating compositions, it was impossible to cure the coating to the inside even when irradiated with ultraviolet rays because carbon black was added to the composition to block light. .

The present inventors further proceeded with research on a method of curing a semiconductive coating composition by irradiating it with ultraviolet rays. As a result, a semiconductive paint composition consisting of an epoxy resin containing Lewis acid salts that can be decomposed by ultraviolet rays as a paint base and carbon black added thereto has been developed. Although it was predicted that ultraviolet rays would be blocked from entering the coating, they discovered an unexpected phenomenon in which the coating could mysteriously harden to the inside.

[Summary of the invention]

The present invention has been made based on the knowledge described in section 2 above, and its gist is that it mainly uses a paint base made of an epoxy resin containing a Lewis acid salt that can be decomposed by ultraviolet light, and carbon black. An ultraviolet curable semiconductive coating composition containing carbon black as a component in an amount of 5 to 50 parts by weight based on 100 parts by weight of an epoxy resin.

[Detailed description of the invention]

The paint base used in the present invention is an epoxy resin containing a Lewis acid salt that can be decomposed by ultraviolet rays to produce a Lewis acid. The Lewis acid salt is decomposed by ultraviolet irradiation to produce a Lewis acid, and the action of the Lewis acid causes a polymerization reaction in the epoxy resin having an epoxy group.

The epoxy resin and the Lewis acid salt may be mixed at the time of preparing the paint, or may be mixed immediately before coating. Examples of Lewis acids include PE6 and BF3, and examples of their salts include Lewis acid diazonium salts (e.g., P-methoxybenzenediazonium hexafluorophosphate-1-) and Lewis acid iodonium salts (e.g., evadiphenyl iodo). Lewis acid sulfonium salts (eg, triphenylsulfonium hexafluorophosphate), and the like.

The carbon black used in the present invention is a fine carbon powder such as channel black, furnace black, thermal black, and acetylene black.

In the present invention, based on 100 parts by weight of the paint base,
Add 5 to 50 parts by weight of carbon black.

Although it varies slightly depending on the type of carbon black, if the amount added is less than 5 parts by weight, a coating film with sufficient semiconductivity cannot be obtained, and if the amount added exceeds 50 parts by weight, the conductivity will be poor. Although the results are relatively good, the coating workability of the paint decreases and the quality of the paint film tends to be somewhat poor.

A particularly preferable addition amount of carbon black is 10 to 30 parts by weight, and a semiconductive coating film having sufficient semiconductivity can be formed without causing the above-mentioned problems.

In the present invention, it is also possible to add silicone compounds, fatty acid esters, amine compounds, surfactants, etc. in order to adjust the coating form. A composition can be prepared by adding carbon black to a resin that serves as a paint base, by the usual method of preparing a paint, for example, by uniformly and thoroughly kneading it by mixing with a universal mixer or a roll.

A method for applying a coating composition according to the present invention,
Application methods include application using a brush or roller, and screen printing.

After the coating composition according to the present invention is applied to a substrate, it is cured by irradiation with ultraviolet rays. UV irradiation.

The conditions are preferably about 10 to 60 seconds using an ultraviolet lamp of about 50 to 200 w/z.

In the paint based on the present invention, after the paint film is cured by ultraviolet irradiation, heat treatment may be performed at a temperature of 80 to 20°C (1 to 60 minutes) to further promote curing. good.

Example 1 Azoka Ultraset 5MX-782 100 parts by weight Denka Acetylene Black 15 ila parts (Denki Kagaku Kogyo ■ product name) A paint was prepared by kneading with three rolls. This paint was screen printed to a thickness of 20 μm on a 50 μm thick polyimide film to form a semiconductive coating film, and 1. Kl
It was cured by irradiating it with ultraviolet light for 30 seconds using two K UV lamps. The semi-cured conductive coating was immersed in methyl ether for 5 minutes. After taking it out, I rubbed the paint film strongly, but there was no abnormality in the paint film, and it was confirmed that the hardening was progressing well to the inside of the paint film.When I measured the conductivity of the paint film, it was 03Ω. It was found that it shows a resistance value.

Example 2 A semiconductive coating film prepared under the same conditions as in Example 1 was irradiated with ultraviolet light and then heat-treated at 50°C for 30 minutes. As a result, the conductivity was slightly improved, showing a resistance value of about 102Ω.

Comparative Example 1 In Example 1, the composition of the paint was changed to: Aroex Oligomer 80 parts by weight Ribokin Resin VR-8020 parts by weight Denka Acetylene Black 15 parts by weight (product name of Denki Kagaku Kogyo Co., Ltd.) Photosensitizer 5 A semiconductive coating film was prepared using the same conditions as in Example 1, except for the measuring part (benzyl dimethyl ketal).The coating surface was well cured, but after immersion in methyl ethyl ketone, the coating film was hardened. As a result, it was discovered that the paint film had shifted from the base film, indicating that it had not sufficiently cured to the inside.

As described above, the coating composition based on the present invention can be easily and rapidly cured by ultraviolet rays, and can form a semiconductive coating film that is semiconductive and has excellent adhesion to substrates and heat resistance. ,
It can be widely used in the formation of semiconductive circuits for electronic device parts and semiconductive coatings for electrical shielding.

Continuing from page 1 ■Int, CI,' Identification symbol Internal office number! HD5
K 9100 6616-5 0 Inventor Noriko Matoba Inside Nishiyodo Prison, Osaka ■Inventor Atsuko Yamamoto Inside Nishiyodo Prison 1, Osaka

Claims (1)

[Claims] (1) A composition comprising a paint base made of an epoxy resin containing a Lewis acid salt that can be decomposed by ultraviolet rays, and carbon black, wherein the amount of carbon black is 5 to 50 parts per 100 parts of paint base. An ultraviolet curable semiconductive coating composition characterized in that parts by weight.