JPS62162534A - Electric laminated board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an electrical laminate used in electrical equipment, electronic equipment, computing equipment, communication equipment, etc.

[Background technology]

Conventionally, printed wiring boards that originate from electrical laminates used in electrical equipment, etc., use photo-phenomenal solder resists, but when irradiated with ultraviolet rays, the ultraviolet light passes through the t-volume laminate and shines all the way to the back side. This often resulted in problems with removal using solvents. If the amount of ultraviolet irradiation is reduced as a countermeasure to this problem, the inherent abrasion resistance, solvent resistance, and temperature resistance of the resist ink will be reduced. On the other hand, if the amount of ultraviolet irradiation is excessive and the residual resist is forcibly removed by mechanical polishing, selective polishing materials, solvent residues, etc. that have damaged the necessary resist surface will adhere to the printed wiring board surface and be transferred to the next process. This will cause quality defects.

Furthermore, there is a method of making electrical laminates black, but this requires the addition of a carbon-based coloring agent, which is unsuitable for fine patterns and has not been used.

[Purpose of the invention]

An object of the present invention is to provide an electrical laminate that does not have the backing of resist ink and can provide a printed wiring board that has excellent abrasion resistance, impact resistance, low humidity insulation resistance, and identifiability. be.

[Disclosure of the invention]

The present invention provides an electrical laminate made by stacking and heating forming a laminate in which a plurality of resin-impregnated base materials are laminated and further provided with metal foil on the upper and/or lower surfaces as required. For electrical laminates, which are characterized by being a base material impregnated with a yellow-green resin containing an ultraviolet absorber, the resist ink is completely cured by irradiation with ultraviolet light using a photo-developable photoresist. The present invention will be described in detail below.

The ultraviolet absorber used in the present invention is a salicylic acid type, benzophenone type, benzotriacey 1v type, hydroxybenzoate type, or cyanoacrylate yarn that absorbs light with a wavelength of 235 to 500 nm. The absorption rate at the wavelength is s at wavelengths of 235 to 300 nm when the entire surface is etched.
ob or more, preferably 85% or more, wavelength 300-400
nm: 97% or more, preferably 99% or more, wavelength 40%
In the range of 0 to 500 nm, it is desirable that the amount is 80% or more, preferably 90% or more. Therefore, the amount of the ultraviolet absorber is preferably 0.2 parts by weight per 100 parts by weight (hereinafter simply referred to as parts) of the resin of the electrical laminate. ~3.5 parts is desirable. That is, if the amount is less than 0.2 parts, the light absorption effect tends to decrease, and if it exceeds 3.5 parts, the moisture resistance and strength of the laminate itself tend to decrease.

1 as an air mass laminate, the resin for the laminate is pheno-μ resin, creso/L' resin, epoxy resin, unsaturated polyester μ resin, melamine resin, polyimide, polybutadiene, polyamide, polyamide-imide, polyphenylene V-sulfide, poly Phenylene oxide, polysulfone, polybutylene terephthalate, polyether ether ketone, fluorinated resin, etc. alone, modified products, mixtures, etc. are used, and water, methyl μacop, acetone, cyclohexanone, etc. are used to adjust the viscosity as necessary. It is preferable to use an epoxy resin having excellent light transmittance. The base material for the laminate may be woven fabric, non-woven fabric, mat or paper made of inorganic fibers such as glass and asbestos, organic synthetic fibers such as polyester, polyamide, polyvinyl resin, acrylic, and natural fibers such as cotton. Alternatively, it is preferable to use a combination of these substrates, etc., and it is desirable to use a glass cloth with excellent light transmittance.

In this way, a plurality of resin-impregnated base materials in which the resin for laminates is impregnated into the base material for laminates are stacked, and among these, the required number of resin-impregnated base materials is a yellow-green resin-impregnated base material containing an ultraviolet absorber. Then, if necessary, a laminate with metal foil disposed on its upper and/or lower surfaces is laminated and integrated. The ultraviolet absorber is preferably added to the resin for the laminate, but is not particularly limited and can be attached to the base material for the laminate.

The present invention will be explained below based on examples.

Examples 1 to 8 and Comparative Examples A glass cloth with a thickness of 0.2 mm is impregnated with brominated epoxy resin Waninu and dried to form a resin-impregnated base material (hereinafter prepreg A ) was obtained. Separately, a resin for laminates was prepared by adding 29% of 2,2' hydroxy 5' methoxy-phenifit benzotriazole to the brominated epoxy resin pheno to a resin solid content of 1007 to a thickness of 0.2Jt! Impregnated into glass cloth and dried to a resin content of 42%
A resin-impregnated base material (hereinafter referred to as prepreg B) was obtained.

Using prepregs A and B, stack them to make a total of 8 sheets according to the combinations in Table 1, and apply a thickness of 0.035ff on the bottom surface.
A laminate with copper foils arranged thereon was molded at a pressure of ωhg/d,
Laminate molding at 170″C for 120 minutes to obtain a plate thickness of 1.6-
An electrical laminate was obtained. This electrical laminate was etched and a resist (trade name: PSR1000, manufactured by Taiyo Ink Manufacturing Co., Ltd.) was applied to both sides at the same time to a thickness of 0.029 mm.
After drying at 0'C, coat the back side again and heat at 70°C.
After drying for 2 minutes, the upper and lower negative films were combined and exposed for 2 minutes using a metal halide lamp (Oak Seisakusho FF). The lamp illuminance at that time was 0.56 mW/ for the RoV-25 sensor, and 27.5 for the J, σV-35 sensor.
mW, Q, σv - Minoru sensor was 72m. After exposure, the uncured portion was subjected to dissolution treatment using modified trichloroethane (manufactured by Asahi Kasei Corporation, trade name: Turner Ilt), and cured for 140'' C1 in a hot air dryer.

Table 1 [Effects of the Invention] The ultraviolet transmittance of the electrical laminates of Examples 1 to 8 and the comparative example is as clear from Table 2. As can be seen, the performance of the present invention was good, confirming that the electrical laminate of the present invention is superior.

Table 2 % Table 3 note Based on data from a fully etched substrate.

Rice 2 Visual inspection 3 Moisture resistant insulation resistance using interdigitated electrodes, °C19
After treatment for 1000 hours, the entire surface was covered with So/L/Der resist.

Claims (3)

[Claims] (1) Requirements for resin-impregnated base materials in electrical laminates made by laminating and heat-molding a laminate in which multiple resin-impregnated base materials are stacked and metal foil is further arranged on the upper and/or lower surfaces as necessary. An electrical laminate comprising a base material impregnated with a yellow-green resin containing an ultraviolet absorber. (2) The electrical laminate according to claim 1, wherein the ultraviolet absorber absorbs light with a wavelength of 235 to 500 nm. (3) The electrical laminate according to claims 1 and 2, wherein the electrical laminate is a glass cloth base laminate.