JPS60145840A - Single-side metallic foil lined 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 a single-sided metal foil-clad laminate used for electronic equipment, electrical equipment, communication equipment, convenience stores, etc.

[Background technology]

Dimensional accuracy has been strongly desired for parts used in recent electronic equipment, electric equipment, communication equipment, computers, etc., which are highly oriented towards higher performance and smaller size. On the other hand, laminates are formed using a multistage press with 20 to 30 heating plates and inserting 8 to 15 sets of laminates made of resin-impregnated base material between the heating plates via metal plates, but once. Because this is a molding method that yields 160 to 450 laminates, the molten resin flows unevenly on each side of the laminate during molding, and the dimensional accuracy of the laminate, especially the warpage accuracy, is low. Ta.

[Purpose of the invention]

An object of the present invention is to provide a laminate with good warpage accuracy.

[Disclosure of the invention]

The present invention is a laminate made by heating and pressing a metal foil on one side of a required number of resin-impregnated base materials, each of which has a resin-impregnated base material, and heat shrinkage on the metal foil side. Because it is a single-sided metal foil-clad laminate that is characterized by having a resin-impregnated base material impregnated with resin, the metal foil usually does not shrink, so it is possible to avoid warping with the metal foil side facing outward. However, in the present invention, a resin-impregnated base material impregnated with a resin whose shrinkage becomes larger toward the metal foil side is provided, so that the shrinkage between the metal foil side and the opposite side of the metal foil is balanced. This made it possible to eliminate warping. The present invention will be explained in detail below.

The base materials used in the present invention include woven fabrics, nonwoven fabrics, mats, paper, etc. made of inorganic fibers such as glass and asbestos, organic synthetic fibers such as polyester, polyamide, polyvinyl alcohol-V, and acrylic, and natural fibers such as cotton. These combination base materials, etc., and resins include phenol resin, cresol resin, epoxy resin, unsaturated polyester M resin, melamine resin, polyimide, polybutadiene, and polyamide.

Polyamideimide, polysulfone, polybutylene vinyl resin, polyether ether ketone, fluorinated resin, etc. alone, modified products, mixtures, etc. are used, and if necessary, water, methyl alcohol, acetone, cyclohexanone is used to adjust the viscosity. , and a solvent such as styrene. As the gold foil, copper foil, aluminum foil, brass foil, nickel foil, stainless steel foil, etc. are used, and if necessary, adhesive is applied to one side of the metal foil. In a laminate in which a resin-impregnated base material obtained by impregnating the above-mentioned resin with the above-mentioned base material is laminated, it is necessary to provide a resin-impregnated base material impregnated with a resin having a high heat shrinkage rate on the metal foil side. The number of resin-impregnated substrates having a high heat shrinkage rate is not particularly limited, and one to a plurality of substrates can be used. In addition, as a resin-impregnated base material with a large heat shrinkage rate, a resin with a molecular weight of 71% that of the resin used for the resin-impregnated base material on the opposite side of the metal foil is used. During impregnation, a resin of a different type or the same type with a higher heat shrinkage rate is attached in an amount of 10 to 90 weight percent of the total resin amount (hereinafter referred to as the highest weight percent), and then used on the resin-impregnated base material on the opposite side of the metal foil. Any means may be taken, such as attaching the same resin to increase the total amount of resin, but there is no particular limitation.

The invention will now be described with reference to examples and then digressed.

〔Example〕

A kraft paper with a thickness of 0.2 m is impregnated with a 7-enol resin with a molecular weight of SAO (number average molecular weight determined by GPC, excluding free phenols, the same applies hereinafter) to a resin amount of over 50, and dried to form a resin-impregnated base material. (Hereinafter referred to as impregnated base material A)
I got it. Separately, on kraft paper with a thickness of 0.2ff, the molecular weight is 17.
After impregnating a phenolic resin with a molecular weight of 0 to a resin amount of 15%, the above-mentioned phenol resin with a molecular weight of 530 is impregnated with a total resin amount of 50 q6, and dried. (referred to as B) was obtained. Next, 32 sheets of the above-mentioned impregnated base material were stacked on top of the 4 sheets of the above-mentioned impregnated base material A, and a 35-micron-thick adhesive-coated copper foil was placed on the top surface with the adhesive side facing the resin-impregnated base material. The laminate was sandwiched between metal plates and laminated for 0 minutes at 160' C11oQ Kg/d to obtain a single-sided copper-clad laminate with a thickness of 1.6 yg.

[Conventional example]

A single-sided copper-clad laminate with a thickness of 1.6 fl was prepared in the same manner as in the example except that a laminate in which the same copper foil as in the example was placed on 6 sheets of the same impregnated base material A as in the example was used. Obtained.

〔Effect of the invention〕

The warping accuracy of the single-sided copper-clad laminates of the example and conventional example is 1g1
As clearly shown in the table, the performance of the single-sided copper-clad laminate of the present invention was well confirmed to be superior to that of the present invention.

Table 1

Claims (1)

[Claims] (1) The laminate is made by heating and pressing a laminate made by stacking the required number of resin-impregnated base materials with metal foil on one side, and the metal foil side has a heat shrinkage rate. A single-sided metal foil-clad laminate characterized by having a resin-impregnated base material impregnated with a large A resin.