JPH0397540A - Manufacture of laminated sheet - Google Patents

Abstract

PURPOSE:To prevent the development of warpage by a method wherein a long metal foil is superposed on the upper surface and/or lower surface of a required number of long polyphenylene-oxide-resin-impregnated dried base materials and the laminated long strip like laminate is cured while transferred continuously and further heated to thermal deformation temp. or higher and subsequently cooled to the thermal deformation temp. or lower. CONSTITUTION:As a long polyphenylene-oxide-resin-impregnated dried base material 1, an inorg. fiber composed of glass or asbestos or an org. synthetic fiber composed of polyester or polyacrylic resin is used. As a metal foil 2, a single foil of copper, aluminum or iron, an alloy foil thereof or a composite foil is used and, if necessary, an adhesive layer is provided on the single surface of the metal foil to more enhance the adhesion of said foil. With respect to the curing of a long strip like laminate 4, curing temp. and a curing time are selected according to the kind of a resin but it is important to perform curing under pressure of 0 - 20kg/cm<2>. Heating 7 after cutting can be set to the thermal deformation temp. of a used resin or higher and cooling 8 can be set to the temp. or lower and cooling is desirably performed rapidly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a laminate used in electronic equipment, electrical equipment, computers, communication equipment, etc. [Prior art] Conventionally, laminates used in electrical equipment, etc. are made by pressing a laminate made of wreath-impregnated paper, resin-impregnated glass cloth, etc. and metal foil for a long time of 1 to 2 hours using a multistage press. Because it is obtained by heating and pressurizing or shaping over time, molding distortion remains in the laminate, and warping occurs due to the heat generated when processing the laminate into a printed wiring board or when mounting electronic components on the printed wiring board. However, there was a drawback that it caused problems in the automated process. This tendency was particularly strong in the case of polyphenylene oxide resin laminates intended to satisfy high frequency characteristics.

[Problem that the invention seeks to solve]

As described in the prior art section, the laminated plate obtained by the multi-stage press method is warped during the processing process.

The present invention has been made in view of the above-mentioned problems in the prior art, and its object is to provide a method for manufacturing a sail polyphenylene oxide resin laminate that does not cause warping.

[Means for solving problems]

The present invention involves stacking a required number of long metal foils on the upper and/or lower surfaces of a dried substrate impregnated with 7-enylene oxide resin,
After curing the laminated long strip-shaped laminate through continuous lamination rolls placed above and below, it is cut to the required size, heated to a temperature above the heat distortion temperature, and then cut to a temperature below the heat distortion temperature. Since the manufacturing method of the laminate is characterized by cooling, pressure can be eliminated or minimized, and residual strain can be eliminated.
The present invention will be explained in detail below. The long polyphenylene oxide 61 resin-impregnated dry base material used in the present invention includes glass, inorganic fibers such as asbestos, polyester, polyacrylic, polyvinyl alcohol, polyamide, polyimide, polyphenylene sulfite, polyurethane, etc. Organic composites or natural fibers such as fibers and cotton, woven fabrics, non-woven fabrics, matte or paper, or combinations thereof, are coated with styrene-butadiene copolymer triallyl insiame. It is impregnated with polyphenylene oxide resin made by adding a peroxidant, etc. so that the resin amount is 40 to 60% by weight (hereinafter simply referred to as reference). It is preferable to use a low viscosity resin such as a resin or a different type of ml fat because it allows for more uniform impregnation. Aluminum hydroxide, talc, silica, etc. are added to the resin as necessary.
Fillers such as alumina can also be added. Furthermore, although the resin may be used as it is, it is preferable to use it after degassing under reduced pressure, in order to suppress the generation of bubbles in the resin-containing Is. As metal foils, single, alloy, and composite foils of copper, aluminum, iron, nickel, zinc, etc. are used.
If necessary, an adhesive layer can be provided on one side of the metal foil to further improve adhesion. The laminating roll may be made of gold, rubber or resin, or a metal roll whose surface is lined with rubber or synthetic resin. The curing temperature and curing time for curing the long strip-shaped laminate can be selected depending on the type of resin, but it is important that the curing is performed under no pressure or at 20 KQ/d.

Heating after cutting. Cooling is not particularly limited as long as it can be made to a temperature above or below the thermal deformation temperature of the resin used, but it is desirable that the cooling is capable of rapid cooling. The explanation is as follows. Embodiment FIG. 1 is a simplified process diagram showing an embodiment of the method for manufacturing a laminate according to the present invention.

As shown in Figure 1, width 1050fl, thickness 0.2flo
On a long glass cloth, 40 parts by weight of polyphenylene oxide (hereinafter simply referred to as parts), 40 parts of styrene ptadiene cobolymer, 120 parts of triallyl in cyanurate, 2
．． 5. 4 pieces of long polyphenylene oxide resin impregnated with 2.5 parts of dimethyl and 316 parts of ditertiarybutylbaroxyhexine to a resin amount of 45t6 and dried long polyphenylene oxide resin-impregnated dry base material 1 A long piece of copper foil 2 with a adhesive 0.035 m thick is placed on the upper and lower surfaces of the sheet, with the adhesive side facing the resin-impregnated base material, and laminated by passing it between laminating rolls 3 disposed above and below. The strip-shaped laminate 4 was sent to a curing furnace 5 and heated and cured at 220° C. under contact pressure. The heat distortion temperature of this cured product was ZaO°C. Next, the cured product was cut into pieces of 1000 x 1000 ffil with a carter 6, heated to 210°C in a heating furnace 7, and then rapidly cooled to 60°C in a cooling furnace 8 to a thickness of 0. A double-sided steel clad laminate 9 of 8 ff was obtained.

Comparative Example The same long polyphenylene oxide resin-impregnated dried base material f as in the example, cut into 10sO x 1050m squares, was stacked together, and the same steel foil as in the example was placed on the top and bottom surfaces, and the same steel foil as in the example was cut into the same dimensions as above. Place things at 220℃ soitg
A double-sided copper-clad laminate having a thickness of Q and 8 fl was obtained by heating and pressing at 7'7 for 30 minutes.

The performance of the laminates of Examples and Comparative Examples is shown in Table 1.

[Effects of the Invention] The present invention is constructed as described above. % The method for manufacturing a laminate having the structure described in the claims has the effect of producing a laminate with less warpage.

[Brief explanation of drawings]

FIG. 1 is a simplified process diagram showing an embodiment of the method for manufacturing an 8l pigeon board of the present invention. 1 is a long resin-containing dry base material, 2 is a copper foil, 3 is a laminating roll, 4 is a long diagonal laminate, 5 is a curing furnace, 6 is a cutter, 7 is a heating furnace, 8 is a cooling furnace, and 9 is a It is a laminated board.

Claims (1)

[Claims] (1) Long metal foils are layered on the upper and/or lower surfaces of the required number of long polyphenylene oxide resin-impregnated dry substrates, and the laminated long strip-shaped laminate is continuously laminated by passing between lamination rolls arranged above and below. 1. A method for manufacturing a laminate, which comprises curing the laminate while transferring to a temperature, cutting it into required dimensions, heating the plate to a temperature higher than the heat distortion temperature, and cooling the plate to a temperature lower than the heat distortion temperature.