JPH06143267A - Resin-impregnated base and electrical laminate - Google Patents

Abstract

PURPOSE:To provide an electrical laminate of superior marking properties and a resin-impregnated base used for the laminate. CONSTITUTION:Allyl containing novolak phenol resin is added to epoxy resin, and if required, a base is impregnated with epoxy resin varnish to which a curing agent, a curing accelerator, a solvent and the like are added to form a resin impregnated base. Metallic foils are disposed integrally with the upper faces and/or lower faces of required number of the resin-impregnated bases to form an electrical laminate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-impregnated base material used for electronic equipment, electric equipment, calculators, communication equipment and the like, and an electric laminate.

[0002]

2. Description of the Related Art In recent years, various printed wiring boards have been used for electric and electronic devices, and the amount thereof has been increasing. For this reason, it is necessary to mark various symbols such as a product number and a wiring diagram on the printed wiring board, but printing on the resin surface easily causes bleeding and bleeding, and it is difficult to make clear marking.

[0003]

As described in the prior art, it is difficult to clearly mark a printed wiring board. The present invention has been made in view of the above-mentioned problems in the prior art, and the purpose thereof is to obtain a resin-impregnated base material and an electric laminated board from which a printed wiring board capable of providing clear marking can be obtained. To provide.

[0004]

According to the present invention, an epoxy resin varnish is prepared by adding an allyl group-containing novolac type phenol resin to an epoxy resin, and further adding a curing agent, a curing accelerator, a solvent, etc., if necessary. A resin-impregnated base material and an electrical laminate comprising a required number of the resin-impregnated base material and a metal foil disposed on the upper surface and / or the lower surface of the resin foil, to achieve the above object. The present invention will be described in detail below.

The epoxy resin used in the present invention is 1
Bisphenol A type epoxy resin having two or more epoxy groups in the molecule, phenol novolac type epoxy resin, cresol novolac type epoxy resin, glycidyl ether type epoxy resin, glycidyl ester type epoxy resin, glycidyl amine type epoxy resin, A linear aliphatic epoxy resin, an alicyclic epoxy resin, a heterocyclic epoxy resin, a halogenated epoxy resin or the like may be used alone, or as a modified product or a mixture thereof. As the curing agent, a phenol resin, an isocyanate, an amine curing agent, an acid anhydride, a Lewis acid complex compound, an imidazole compound or the like is used and is not particularly limited, but it is necessary to include an allyl group-containing novolac-type phenol resin. Is. An allyl group-containing novolak type phenol resin has an average molecular weight of 500 to 9
00, a viscosity of 10,000 to 50,000 cps, and a hydroxyl equivalent of 120 to 170, and the addition amount is preferably 5 to 30 parts with respect to 100 parts by weight of the epoxy resin (hereinafter simply referred to as "part"). That is, if it is less than 5 parts, it is difficult to improve the marking property, and if it exceeds 30 parts, the moldability tends to decrease. If necessary, a phosphorus-based or tertiary amine-based curing accelerator is used as the curing accelerator. If necessary, a solvent that is compatible with the resin, such as a ketone-based solvent or an alcohol-based solvent, can be used and is not particularly limited. Further, if necessary, inorganic powder fillers such as talc, clay, silica, calcium carbonate, aluminum hydroxide, antimony trioxide and antimony pentoxide, and fiber materials such as glass fiber, asbestos fiber, pulp fiber, synthetic fiber and ceramic fiber. Fillers, colorants and the like can be added. As the base material, it is possible to use glass, inorganic fibers such as asbestos, organic fibers such as polyester, polyamide, polyacrylic, polyvinyl alcohol, polyimide and fluororesin, woven cloth of natural fibers such as cotton, non-woven fabric, paper and mat. it can. The base material may be impregnated only with the same resin, but multiple impregnations such as primary impregnation and secondary impregnation with the same resin or different resin,
It is also possible to make the impregnation more uniform. Thus, the resin is impregnated into the base material and dried to obtain a resin-impregnated base material. As the metal foil, a single, alloy, or composite foil of copper, aluminum, brass, nickel, iron or the like can be used. In this manner, a metal foil is provided on the upper surface and / or the lower surface of the required number of the resin-impregnated base materials and integrated to obtain an electrical laminate. The present invention will be described below based on examples.

[0006]

Example: To 100 parts of a bisphenol A type epoxy resin having an epoxy equivalent of 475, 10 parts of an allyl group-containing novolak type phenol resin having an average molecular weight of 690, a hydroxyl equivalent of 142 and a viscosity of 30,000 cps, and dicyandiamide 3
Part, benzyl dimethylamine 0.2 part, and methyl oxitol 100 parts epoxy resin varnish are impregnated with a 0.018 mm thick plain woven glass cloth so that the resin adhesion amount becomes 45% by weight, and dried to impregnate the resin. A base material was obtained. Next, a thickness of 0.035 is applied to the upper and lower surfaces on which the eight resin-impregnated base materials are stacked.
mm of copper foil is placed on the laminated body and the molding pressure is 40 kg /
thickness of 1. cm ² at 160 ° C. for 90 minutes.
A 6 mm double-sided copper-clad laminate was obtained.

[0007]

[Comparative Example] A resin-impregnated base material was obtained and a double-sided copper-clad laminate having a thickness of 1.6 mm was obtained in the same manner as in Example except that no allyl group-containing novolac-type phenol resin was used.

Table 1 shows the performance of the electrical laminates of Examples and Comparative Examples.

[0009]

[Table 1]

[0010]

The present invention is constructed as described above.
It was confirmed that the electrical laminate using the resin-impregnated base material having the structure described in the claims has excellent marking properties and is excellent in the present invention.

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Claims (2)

[Claims] 1. An epoxy resin varnish obtained by adding an allyl group-containing novolac-type phenol resin to an epoxy resin, and further adding a curing agent, a curing accelerator, a solvent, etc., if necessary, and drying the epoxy resin varnish. Resin impregnated base material. 2. A resin-impregnated base material obtained by impregnating a base material into an epoxy resin varnish obtained by adding an allyl group-containing novolac-type phenol resin to an epoxy resin and further adding a curing agent, a curing accelerator, a solvent, etc., if necessary. 2. A laminated board for electric use, characterized in that a required number of upper and / or lower surfaces are provided with metal foils and integrated.