JPH04309284A - Manufacture of glass cloth-reinforced laminated board for electrode use - Google Patents

Abstract

PURPOSE:To reduce a linear expansion coefficient and a warpage amount and to increase a mechanism strength by employing a board of glass cloth having an average filament diameter of 9.6-10.2mum, a thickness of 180-200mum, a unit weight of and 210-220g/m<2>. CONSTITUTION:Glass cloth is generally called as cloths in which yarna formed by bundling many fine filaments, are longitudinally and laterally woven in various types of weaving such as sateen weave, plain weave, cross plain weave, twill weave, etc. The cloth to be used has an average diameter 9.6-10.2mum, of filament, a thickness of 180-200mum, and a unit weight of 210-220g/m<2>. For example, a plain weave glass cloth in which 40-42/25mm yarns in which 400 filaments are longitudinally and laterally dundled, and 31-37/25mm of the yarns are woven, is used. Thus, its linear expansion coefficient and its warpage amount can be reduced, and its mechanism strength can be enhance.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing glass cloth reinforced electrical laminates. What is an electrical laminate here?
It refers to insulating plates used as substrates for various electrical and electronic components and metal foil-clad laminates used as printed circuit boards.

0002

BACKGROUND ART In recent years, in response to the miniaturization of electronic devices, high-density mounting and automatic mounting of components onto printed wiring boards have been developed. Therefore, the quality required for the laminates used as substrates is becoming increasingly strict. Laminated plates are subject to heat during processing and during use of equipment on which components are mounted, and are susceptible to expansion and warping.

[0003] Glass cloth reinforced laminates are mainly used in OA equipment and consumer equipment, sometimes in combination with flame-retardant resin. Until now, laminates have been produced using a batch dry method in which the base material is impregnated with resin varnish and dried to create a prepreg, which is stacked in the required number of sheets and press-molded. In recent years, a wet continuous method has been developed that uses resins such as unsaturated polyester resins and epoxy acrylate resins, which are liquid themselves and do not generate reaction by-products during curing, to continuously carry out the process from impregnation of the base material to lamination curing. It is attracting attention because of its high productivity.

However, when manufacturing a glass cloth-reinforced electrical laminate by applying the wet continuous method, if glass cloth, which is generally used in the dry method, is used as the base material, the coefficient of linear expansion is high and the amount of warpage is large. I understand. Therefore, an object of the present invention is to apply a wet continuous method to produce a glass cloth reinforced electrical laminate having a small coefficient of linear expansion and a small amount of warpage.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a method for curing a plurality of rows of glass cloth substrates while continuously conveying them in parallel, and curing the substrate rows individually in a liquid state without generating reaction by-products. A method for manufacturing an electrical laminate, which includes the steps of impregnating the laminate with a synthetic resin, laminating and combining impregnated base materials, laminating a cover sheet and/or metal foil, continuously curing, and then cutting into desired dimensions, A method for producing a glass cloth reinforced electrical laminate, characterized in that the glass substrate is a glass cloth with an average filament diameter of 9.6 to 10.2 μm, a thickness of 180 to 200 μm, and a basis weight of 210 to 220 g/m2. provide. According to the present invention, it is possible to obtain a laminate having a small coefficient of linear expansion and a small amount of warpage, and excellent mechanical strength.

[0006]

[Preferred Embodiment] Glass cloth is a yarn made of a large number of thin glass filaments, such as satin weave, plain weave,
It is a general term for cloth that is woven vertically and horizontally using various weaving methods such as plain weave and twill weave. The glass cloth used in the present invention has filaments with an average diameter of 9.6 to 10.2 μm, a thickness of 180 to 200 μm, and a basis weight of 210 μm.
~220g/m2. For example, a yarn made by collecting around 400 filaments may be bundled with a length of 40 to 42
A plain weave glass cloth woven with 25 mm threads and 31 to 37 threads/25 mm horizontally is used.

[0007] In carrying out the present invention, the wet continuous method disclosed in JP-A-55-4838 and JP-A-56-98136 etc. by the present applicant is used, except that the glass cloth is used as the base material. Can be applied.

One of the characteristics of the wet continuous method is that a curable resin that is liquid itself and does not generate reaction by-products upon curing is used as the resin for impregnating the base material. Such resins include unsaturated resins such as unsaturated polyester resins, epoxy acrylate resins, polyester acrylate resins, diallyl phthalate resins, mixtures thereof, and epoxy resins. Mixtures of halogen-containing resins, such as bromine-containing unsaturated polyester resins and epoxy acrylate resins, may be used, and flame retardant aids such as antimony trioxide may be included.

After the substrates conveyed in parallel are individually impregnated with the resin, these substrates are laminated and combined, and a metal foil such as copper foil is applied to both or one side of the laminate after curing. It becomes an integral part. The surface not covered with metal foil is covered with a cover sheet such as a polyester film, which is peeled off after curing. After that, it is cut to a predetermined size and subjected to post-curing, if necessary. The manufacturing method of electrical laminates by the wet continuous method is described in the patent application of the applicant cited above, especially in the Japanese Patent Application Laid-open No. 5
6-98136 and will not be discussed further. The invention is illustrated below with examples and comparative examples.

Example: Eight layers of glass cloth with a thickness of 190 μm, an average filament diameter of 9.8 μm, and a basis weight of 215 g/m2 were used as the base material, and an epoxy resin adhesive layer with a thickness of 40 μm was used.
A double-sided copper-clad unsaturated polyester laminate with a thickness of 1.6 mm was produced by a continuous manufacturing method, with copper foil coated on both sides with a copper foil of 18 μm thick coated on both sides. The impregnating resin was a liquid mixture of 70 parts by weight of flame-retardant unsaturated polyester resin (bromine content: 14% by weight), 30 parts by weight of epoxy acrylate resin, 4 parts by weight of antimony trioxide, and 1 part by weight of benzoyl peroxide. Using resin. While continuously conveying the glass cloth substrate, it is individually impregnated with the resin and then combined, and after laminating copper foil on the double-sided board, it is continuously passed through a tunnel type curing furnace and heated at 100 ° C. 15 minutes, 15
It was heat cured at 0°C for 10 minutes.

Comparative Example The thickness was determined by the same procedure as in the example except that 8 layers of glass cloth with a thickness of 180 μm, an average filament diameter of 9.5 μm, and a basis weight of 200 g/m2 were used as the base material of the glass cloth. A 1.6 mm double-sided copper foil-clad laminate was manufactured. The performance of the laminates of Examples and Comparative Examples is shown in the table below.

[Table 1]

[0012] Method for evaluating warpage after heating The laminate manufactured by the above method was 250 x 250 mm.
The copper foil on one side is completely removed by etching. After that, heat treatment was performed at 170°C for 30 minutes, and then the side with the remaining copper foil was placed on a glass flat plate facing down.The distance from the four corners of the laminate from the glass flat plate was measured and the maximum value was calculated. I asked for it.

Method for measuring coefficient of linear expansion TMA8140 manufactured by Rigakusha (heating rate 2°C/min)
Calculated based on the results measured in .

Claims (1)

[Claims] Claim 1: A plurality of rows of glass cloth substrates are continuously conveyed in parallel, and the rows of substrates are individually impregnated with a curable resin that is itself liquid and does not generate reaction by-products upon curing. ,
A method for manufacturing a glass cloth reinforced electrical laminate comprising the steps of laminating and combining impregnated base materials, laminating a cover sheet and/or metal foil, curing continuously, and then cutting into desired dimensions. The base material has a filament average diameter of 9.6 to 10.2 μm and a thickness of 180 to 200 μm.
A method for producing a glass cloth reinforced electrical laminate, characterized in that the glass cloth has a basis weight of 210 to 220 g/m2.