JPS6161839A - Cushion material for manufacturing 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 (Industrial Application Field) The present invention relates to a cushioning material used in the production of laminates, particularly copper-clad laminates that are electrically insulating materials, multilayer printed wiring boards, and the like.

(Prior Art) A laminate is formed by impregnating a base material with a matrix resin, drying it, stacking the required number of sheets on top of each other, and heating and pressing them.

Paper, glass cloth, glass paper, cloth, etc. are used as the base material, and epoxy resin, phenol resin, polyester resin, melamine resin, silicone resin, etc. are used as the matrix resin.

When manufacturing a laminated board, cushioning material is placed on a metal plate, and a mirror plate with a smooth surface (some are processed to have an uneven surface depending on the purpose) is placed on top of the prepreg, and several mirror plates are stacked. Afterwards, place the cushioning material and metal plate and heat and pressurize.

The above-mentioned requirements for Cook 1 materials include heat resistance, cushioning properties, number of uses, workability, etc., and the quality of laminates such as appearance, thickness, deviation, warping, twisting, etc. is greatly affected by the cushioning material. Ru.

Conventionally, aromatic polyamide paper, felt, rubber sheet, kraft paper, and composites thereof have been proposed as this type of cushioning material1, but aromatic polyamide paper has a high elastic modulus and requires higher pressure lamination conditions. The pattern created by the uneven papermaking is transferred to the laminate. With felt, fuzz generated from the surface and edges scatters, reducing the quality of the product's appearance, etc. Rubber sheets deteriorate due to heat and deformation as the number of times they are used increases, causing pressure unevenness, which causes problems such as the thickness and appearance of the laminate. In addition, kraft paper has disadvantages such as reduced quality, dust generated from the surface edges, the fact that it can be used only once, and problems with each preparation operation.

(Object of the Invention) The object of the present invention is to provide a cushioning material that enables the production of a laminate that is excellent in heat resistance, cushioning, number of uses, workability, and has excellent characteristics such as thickness accuracy. .

(Structure of the Invention) The present invention provides a heat-resistant uniform woven fabric, non-woven fabric, paper, or sheet by using an adhesive layer on both sides of a heat-resistant cushioning material body mainly composed of aromatic polyamide fibers and rock wool. This is a cushioning material for manufacturing laminates made of integrated adhesive.

The present invention will be described in detail below with reference to the drawings.

The drawing is a partial cross-sectional view showing an example of the Kutsushiran material according to the present invention.

Reference numeral 1 denotes the cushioning material body, and breathpods made of woven fabrics, nonwoven fabrics, and blended paper containing aromatic polyamide and Rockcoeur as main components are used. Breathpods made of mixed paper are preferred from the viewpoint of cookability and uniformity of pressure.

2 is a woven fabric, nonwoven fabric, paper, or sheet made of aromatic polyamide or having heat resistance equal to or higher than that, and the woven fabric is processed into plain weave, satin weave, or twill weave. Furthermore, in order to prevent unreacted materials from the adhesive layer and oozing of melted material from occurring, it is desirable to treat the surface with a heat-resistant resin such as silicone resin, polyamide resin, polyimide resin, melamine resin, etc.

5 is the cushion material body 1 and the surface/! A thermosetting resin adhesive or a thermoplastic resin film can be used for the adhesive layer used to bond #2.

As the thermosetting resin adhesive, epoxy resin, polyamide resin, polyimide resin, nitrile rubber adhesive, phenol adhesive, etc. can be used.

As the thermoplastic resin, nylon, polyester, polyethylene, etc. are used, and preferably a film with a thickness of 100 μm or less is used.

4 is a coating treatment used to prevent fuzz generated from the end surface of the cushion material and fraying of the threads on the front and back sides; - Silicone resin, polyamide resin, polyimide resin, etc. are used as the tensioning agent. It will be done.

A twill weave fabric using aromatic polyamide fibers on both sides of a pressboard made mainly of aromatic polyamide and rock wool is treated with melamine resin, applied with a nitrile rubber adhesive, and heated together. A copper-clad laminate was manufactured using the cushioning material prepared under the following conditions.

100 parts of epoxy resin (11-470g/e per epoxy
q) in 25 parts of methyl ethyl ketone, 4 parts of dicyandiamide as a hardening agent dissolved in 50 parts of methyl glycol, and 2 parts of 2-methyl-4-methylimidazole α were added to the glass cloth as a base material (Nittobo M (ceramic)). Impregnated with product name WE-18W (epoxy silane treatment) and resin content 3
A prepreg with an 8-42% gel time of 40 seconds and a resin flow of 18% was prepared. Using the obtained 8 sheets of prepreg, a pressure of 40 kg/ant, a heating temperature of 165°C, and a heating time of 120 minutes were used in accordance with a conventional method to obtain 100 QmrmX 1000 mm.
A copper-clad laminate with a thickness of 1.6M was manufactured.

8! The thickness and appearance of stiff copper-clad laminates, unevenness on the surface of laminates, and copper foil have been removed by etching! j# board 50ffll
A test piece of llX50ffIO+ was prepared and tested for soldering heat resistance after being subjected to a pressure cooker (forced moisture absorption in water vapor at 121°C).

In addition, zoommxso is fully etched.

The dimensional changes of the ma+ laminate before and after heating at 170°C for 60 minutes were measured. The results are shown in the attached table.

Comparative Example 1 Steel-clad laminates were manufactured under the same conditions as in the example except that a cushioning material containing a rubber sheet as a main component was used during lamination, and the characteristics of each are shown in the separate table.

Comparative Example 2 Copper-clad FJTM boards were manufactured under the same conditions as in the example except that kraft paper was used as a cushioning material during lamination, and the characteristics of each are shown in the attached table.

The cushioning material of the present invention has excellent heat resistance, cushioning properties, number of uses, and workability, has little thickness deviation, has no unevenness on the surface, has no defects such as voids and scratches, and can be manufactured into a laminate with little warpage and twisting. possible.

[Brief explanation of drawings]

The drawing is a cross-sectional view of the cushioning material. Explanation of symbols

Claims (1)

[Claims] 1. A heat-resistant uniform woven fabric, non-woven fabric, paper, or sheet is bonded to both sides of a heat-resistant cushioning material body mainly composed of aromatic polyamide fibers and rock wool via an adhesive layer. A cushioning material for manufacturing laminates made of an integrated material. 2. The cushioning material for manufacturing a laminate according to claim 1, wherein the woven fabric, nonwoven fabric, paper, or sheet to be bonded to the surface is treated with a heat-resistant resin. 3. A cushioning material for manufacturing a laminate according to claim 1 or 2, wherein the end face is coated with a heat-resistant resin.