JPH0421413A - Manufacture of laminated sheet - Google Patents

Abstract

PURPOSE:To reduce the warpage of laminated sheet available for electronic, electric and communication machineres by a method wherein specific films are arranged to the respective upper and under surfaces of a required number of long base materials to form a long laminate which is, in turn, molded under heating and pressure to be cut into a required dimension and the cut ones are heated to thermal deformation temp. or higher and subsequently quenched to said temp. or lower. CONSTITUTION:Long thermosetting polyphenylene oxide resin films 2 are supplied so as not only to arrange intermediate layers between three long glass cloths 1 but also to form outermost layers and long adhesive applied copper foils 3 are further arranged to the outermost layers so that the adhesive layers thereof are opposed thereto the form a long laminate 4 which is, in turn, continuously molded under heating and pressure in a double belt roll apparatus 5 and subsequently cut by a cutter 6. The cut ones are further heated to thermal deformation temp. or higher in a heating oven 7 to be perfectly cured and subsequently quenched to said temp. or lower in a cooling oven 8 to obtain laminated sheets 9. Quenching is carred out in a liquid such as water or dry ice vapor. A molten resin is introduced into a base material and a heating and pressing time can be minimized and the residual strain in the laminated sheet can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a laminate used in electronic/electrical equipment, computers, communication equipment, etc.

[Conventional technology]

Conventional laminates made of thermosetting polyphenylene oxide resin are produced by impregnating a base material with thermosetting polyphenylene oxide resin varnish and drying it, then heating and press-molding the prepreg and metal foil in a multistage press for 1 to 2 hours. However, in addition to poor resin impregnation into the base material, molding distortion remains in the laminate due to long-term heat and pressure molding, which may cause problems when processing the laminate into printed wiring boards or printed wiring. The drawback was that the heat generated when electronic components were mounted on the board caused warping, which caused problems in the automated process.

[Problem that the invention seeks to solve]

As described in the prior art section, a laminate obtained by molding a prepreg obtained by impregnating a base material with a thermosetting polyphenylene resin varnish using a multi-stage press has the disadvantage of large warpage. The present invention has been made in view of the above-mentioned problems in the prior art, and its purpose is to provide a method for manufacturing a laminate with less warpage.

[Means for Solving the Problems] The present invention provides a long thermosetting polyphenylene oxide resin film on each upper surface and/or lower surface of a required number of long base materials, and further includes a long thermosetting polyphenylene oxide resin film as the outermost layer as necessary. A laminate characterized in that a long laminate on which metal is arranged is continuously heated and pressure-formed, then cut into required dimensions, further heated above the heat distortion temperature, and then rapidly cooled to below the heat distortion temperature. Due to the manufacturing method, the molten resin is press-fitted into the base material, and the heating and pressing time can be minimized, thereby reducing residual strain in the laminate.Detailed explanation of the present invention is given below. do.

Long substrates used in the present invention include woven fabrics made of inorganic fibers such as glass and asbestos, organic synthetic fibers such as polyester, polyacrylic, polyvinyl alcohol, polyamide, polyimide, polyphenylene sulfide, and polyurethane, and natural fibers such as cotton; The base material is a non-woven fabric, a mat, a mat, or a combination thereof.

The long base material can also be treated with a coupling agent in advance. As the long thermosetting polyphenylene oxide resin film, 1
・2-polybutadiene, I-4 polybutadiene, styrene-butadiene copolymer, modified 1-2 polybutadiene (malein-modified, acrylic-modified, epoxy-modified, etc.), triallylisocyanurate, crosslinkable polymers such as rubbers, pacyl peroxide, 2・Thermosetting polyphenylene oxide resin made of a polymerization initiator such as 5-dimethyl 2,5-dibenzoyl peroxyhexane, tertiary-butyl peroxybenzoate, dicumyl peroxide, etc. to a thickness of 0.005 to 0.5 cm. It was made into a shaku film. If necessary, aluminum hydroxide, talc, silica,
Inorganic fillers such as alumina, calcium carbonate, and magnesium carbonate, and fibrous fillers such as glass fiber chips, asbestos, wood flour, bulbs, and cotton powder can also be added. Single, alloy, or composite foils of copper, aluminum, iron, nickel, zinc, etc. are used as long metal foils, and if necessary, an adhesive layer is provided on one side of the metal foil to further improve adhesion. You can also do that. Long laminates can be continuously heated and pressure molded using a double belt method, etc., and the curing temperature varies depending on the resin composition, but the pressure is 5 to 40 kg/C.
11i is preferred. Note that it is desirable to preheat the elongated laminate immediately before molding. Furthermore, after the formed laminate is cut to the required size, it is necessary to heat it above the heat distortion temperature to ensure complete hardening, and then rapidly cool it below the heat distortion temperature to reduce warpage. Liquid, dry ice vapor, etc. are preferred.

The present invention will be described below based on an illustrated embodiment.

〔Example〕

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 FIG. 1, 103 sheets of long glass cloth with a width of 105C1 and a thickness of 0.15 mm are coated between each layer and on the outermost layer.
1 long thermosetting polyphenylene oxide resin film 2 (40 parts by weight of styrene-butadiene copolymer, 120 parts by weight of triallylisocyanurate, 2.5 dimethyl 2.5 ditert-butyl peroxy, 40 parts by weight of polyphenylene oxide) A resin film containing 6 parts by weight of Xin 3) is disposed, and the outermost layer is coated with a thickness of 0.
A long laminate 4 of 035 mm long adhesive-coated copper foil 3 with the adhesive side facing the film 2 was molded using a double heat roll device 5 at a molding pressure of 10 kg/cIIN, 2.
After continuous heating and pressure molding at 20°C for 10 minutes, cut into pieces every 100 cm with cutter 6, then heated to 210°C for 10 minutes in heating path 7, and then rapidly cooled to 6°C in cooling furnace 8. A laminate 9 having a thickness of 0.6 ff1o+ was obtained.

[Comparative Example 1] The same reheated laminate as in Example was used as a laminate without quenching.

[Comparative Example 2] The same cut laminate as in the example was used as a laminate without being reheated.

[Comparative Example 3] The same long laminate as in Example was cut into 10105 x 105 pieces, and laminated by pressing at a molding pressure of 50 kg/ctll and 220''C for 60 minutes to obtain a laminate with a thickness of 0.6 trm.

[Comparative Example 4] Three prepreg sheets of 10105 x 105 size, which were impregnated with the same thermosetting polyphenylene oxide resin as in the example in a glass cloth with a thickness of 0.15 mm and dried so that the resin amount was 30%, were stacked. Furthermore, a laminated body with the same copper foil as in the example provided on the outermost layer was molded at a pressure of 50 kg/c-d.
A laminate plate having a thickness of 0.6 m was obtained by lamination molding using a press at 220°C for 60 minutes.

The performances of the laminates of Examples and Comparative Examples 1 to 4 are shown in Table 1.

Table 1 [Effects of the Invention] The present invention is constructed as described above. The laminate obtained by the method for producing a laminate having the configuration described in the claims had little warpage, confirming the superiority of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a simplified process diagram showing an embodiment of the method for manufacturing a laminate according to the present invention. l... Long base material, 2... Long thermosetting polyphenylene oxide resin film, 3... Long metal foil, 4...
°゛Long laminate, 5...double belt roll device, 6
...Cutter 7...Heating furnace, 8...Cooling furnace, 9
...It is a laminate board.

Claims (1)

[Claims] (1) A long laminate in which a long thermosetting polyphenylene oxide resin film is arranged on the upper and/or lower surface of each of the required number of long base materials, and if necessary, a long metal foil is arranged as the outermost layer. A method for manufacturing a laminate, which comprises continuously heating and press-molding a body, cutting it into required dimensions, further heating it above its heat distortion temperature, and rapidly cooling it below its heat distortion temperature.