JPH06171018A - Laminated sheet - Google Patents

Abstract

PURPOSE:To provide a laminated sheet reduced in warpage and distortion by a non-pressure continuous manufacturing method. CONSTITUTION:In a laminated sheet obtained by subjecting a long laminate obtained by laminating a long metal foil to the upper surface and/or rear surface of a required number of long resin impregnated materials transferred in a horizontal state to continuous laminate molding under non-pressure and cutting the same into a required dimension, the thickness difference between the resin layers of the resin impregnated base materials of the upper and rear uppermost layers is set to 10mum or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electronic equipment, electric equipment,
The present invention relates to a laminated board used for a computer, a communication device and the like.

[0002]

2. Description of the Related Art Conventionally, a laminated plate obtained by a pressureless continuous manufacturing method is obtained by heating and curing the laminated body of a resin-impregnated base material and a metal foil in a horizontal state and heating without pressure. The heavy base material sinks inside the body, the resin floats on the surface, and the cross-section after curing shows that the resin layer thickness on the outermost resin impregnated base material surface is 30-40 microns on the upper surface and 15-20 microns on the lower surface. As a result, the laminated plate is warped and twisted to reduce the dimensional stability.

[0003]

As described in the prior art, there is a problem that the laminated plate obtained by the conventional pressureless continuous manufacturing method is apt to cause warp and twisting defects.
The present invention has been made in view of the above-mentioned problems in the prior art, and an object of the present invention is to provide a laminated plate which does not warp or twist by a pressureless continuous manufacturing method.

[0004]

According to the present invention, a continuous laminate in which a long metal foil is laminated on the upper surface and / or the lower surface of a required number of long resin-impregnated base materials is continuously formed without pressure. ,
In the laminated plate cut into the required dimensions, the difference in resin layer thickness between the front and back outermost layer resin-impregnated base material is within 10 μm. Therefore, the structural balance of the laminated plate can be balanced and warped or twisted. There is no laminated board. The present invention will be described in detail below.

The long base material used in the present invention includes inorganic fibers such as glass, ceramics and asbestos, and vinyl alcohol.
Polyimide, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyphenylene sulfide, polyphenylene oxide, woven cloth made of organic fibers such as fluororesin and natural fibers such as cotton, non-woven fabric, paper, woven cloth, Nonwoven fabric and paper can also be used together. The constituent position may be, for example, a composite structure in which the core part is made of glass nonwoven fabric and the surface part is made of glass cloth. As the resin with which the base material is impregnated, an unsaturated polyester resin, a phenol resin, an epoxy resin, a diallyl phthalate resin, a vinyl ester resin (also referred to as an epoxy acrylate resin) alone resin, a modified resin, or a mixed resin is used. Add inorganic powder filler such as talc, clay, calcium carbonate, aluminum hydroxide, silica, etc., or fiber filler such as glass fiber, asbestos fiber, pulp fiber, synthetic fiber, ceramic fiber, etc. You can Further, the impregnating resin may be impregnated only with the same resin, but the primary impregnation with the same resin may be a low-viscosity resin and the secondary impregnation may be an impregnation with a higher-viscosity resin. Multiple impregnations such as impregnation and secondary impregnation may be performed to make the impregnation more uniform. Thus, the long base material is impregnated with a resin by any means such as single-sided impregnation or whole surface impregnation to obtain a long-length resin-impregnated base material. The difference in resin layer thickness between the front and back outermost layer resin-impregnated base material can be set to within 10 μm by adjusting a laminating roll. If the thickness difference exceeds 10 microns, the structural balance of the laminated plate is disturbed, and the laminated plate is warped and twisted. The required number of long resin-impregnated base materials can be used according to the required thickness of the laminated plate. Copper as a long metal foil,
Aluminium, brass, nickel, iron etc. alone, alloy,
A composite foil is used, and an adhesive layer can be provided on one side of the metal foil if necessary. Thus, the long-sized laminated body obtained by laminating the long-sized metal foil on the upper surface and / or the lower surface of the long-sized resin-impregnated base material is laminated and molded without pressure to obtain a laminated plate. In the pressureless lamination molding integration of the long laminate, the curing time and the curing temperature can be selected depending on the resin, the base material, the thickness, etc., but the curing temperature is preferably 130 to 200 ° C. After the laminated molding, the laminated plate is obtained by cutting it to a required size with a cutter or the like. After cutting, the appearance can be further improved by reheating or rapid cooling if necessary. Reheating is the glass transition point (T
g) It is desirable to heat to the above temperature or more, and the rapid cooling after reheating is performed by cooling in a liquid such as low temperature water or alcohol, or in a low temperature gas to quench, and preferably in water at 25 ° C. or lower. The present invention will be described below based on examples.

[0006]

EXAMPLE A vinyl ester resin (manufactured by Showa Polymer Co., Ltd., product number R806) containing 20% by weight (hereinafter simply referred to as "%") of talc in a glass non-woven fabric having a thickness of 1 mm and a width of 105 cm.
-DA) is transferred to one long vinyl ester resin-impregnated glass non-woven fabric substrate impregnated with a resin amount of 45%, and the upper and lower surfaces thereof have a thickness of 0.15 m.
Long vinyl ester resin impregnated glass woven fabric in which a vinyl ester resin (manufactured by Showa Highpolymer Co., Ltd., product number R806-DA) is impregnated into a long glass woven fabric having a width of 105 m and a width of 105 cm so that the resin amount is 45%. After transferring two base materials in a horizontal state, adjust the laminating roll and laminate so that the resin layer thickness difference between the front and back outermost layer resin-impregnated base material is 5 microns, and further, 105 cm in width on the upper and lower surfaces. , A long laminated body in which a long copper foil having a thickness of 0.035 mm is laminated for 20 minutes continuously at 170 ° C. without pressure, and then cut into 100 cm square with a cutter to obtain a laminated board having a thickness of 1.2 mm Was continuously obtained.

[0007]

[Comparative Example] A laminated plate having a thickness of 1.2 mm was continuously obtained by the same process as in Example except that each substrate was impregnated with resin and then laminated as it was.

Table 1 shows the resin layer thickness, warpage, and twist of the resin-impregnated base material for the outermost layers of the front and back of the laminates of Examples and Comparative Examples.

[0009]

[Table 1]

[0010]

The present invention is constructed as described above. It has been confirmed that the laminated plate having the structure described in the claims can significantly reduce warpage and twist of the obtained laminated plate, and that the present invention is excellent.

Claims (1)

[Claims] 1. A continuous laminate formed by laminating a long metal foil on the upper surface and / or the lower surface of a required number of long resin-impregnated base materials continuously without pressure, and then cut into a required size. In the laminate, the difference in the resin layer thickness of the resin-impregnated base material on the front and back outermost layers is within 10 microns.