JPH05278162A - Laminated sheet and production thereof - Google Patents

Abstract

PURPOSE:To enhance silver migration properties, in a laminated sheet wherein metal foils are integrally arranged to the upper and under surfaces of a resin impregnated nonwoven fabric, by specifying unit wt. index of the nonwoven fabric represented by [nonwoven fabric unit wt./laminated sheet thickness]. CONSTITUTION:The nonwoven fabric of a resin impregnated nonwoven fabric is made of an inorg. fiber such as a glass fiber or a ceramic fiber, an org. fiber such as a vinyl alcohol fiber or a polyimlde fiber or a natural fiber such as cotton or composed of paper or the like and the unit wt. index thereof represented by [nonwoven fabric unit wt./laminated sheet thickness] must be 30-85. As a metal foil, a copper foil, an aluminum foil or an iron foil is used alone and an alloy foil and a composite foil are also used. If necessary, an adhesive layer can be provided to the single surface of the metal foil.

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, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, non-woven fabric base laminates have excellent punching properties, but the non-woven fabrics used for the laminates have a large amount of glass fibers and a large number of interfaces with the resin, resulting in poor silver migration. There was a problem.

[0003]

As described in the prior art, the conventional non-woven fabric substrate laminate has a problem that the silver migration property is poor. The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide a laminated plate excellent in punching property and silver migration property, and a manufacturing method thereof.

[0004]

According to the present invention, a required number of resin-impregnated non-woven fabrics are arranged on the upper and lower surfaces of a required number of resin-impregnated glass cloths, and further metal foils are arranged on the upper and / or lower surfaces thereof to form a body. In the laminated plate described above, the nonwoven fabric has a unit weight index of 30 to 85, which is represented by [nonwoven fabric single weight / laminated plate thickness], and a method for producing the same. The present invention will be described in detail below.

The resin-impregnated non-woven fabric used in the present invention includes inorganic fibers such as glass, ceramics and asbestos, vinyl alcohol, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyphenylene sulfide, polyphenylene oxide. , Non-woven fabrics made of organic fibers such as fluororesin and natural fibers such as cotton, and non-woven fabrics such as paper, the unit weight index of the non-woven fabric indicated by [nonwoven fabric unit weight / laminated plate thickness] is 3
It must be 0 to 85. That is, if it is less than 30, it tends to be torn during resin impregnation, and if it exceeds 85, the silver migration property is deteriorated. As the glass cloth of the resin-impregnated glass cloth, a commonly used glass cloth can be used as it is. As the resin to be impregnated into the non-woven fabric and the glass cloth, phenol resin, epoxy resin, unsaturated polyester resin, polyimide resin, vinyl ester resin (also called epoxy acrylate resin), polybutadiene resin, polyphenylene oxide resin, fluorine resin, etc. , Modified products, mixtures are used, talc, if necessary,
Inorganic powder fillers such as clay, calcium carbonate, aluminum hydroxide and silica, and fibrous fillers such as glass fibers, asbestos fibers, pulp fibers, synthetic fibers and ceramic fibers can be added. 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, a resin is impregnated into a glass cloth or a non-woven fabric to obtain a resin-impregnated base material, and the resin content of the resin-impregnated base material is preferably 35 to 65% by weight (hereinafter simply referred to as%). The required number of resin-impregnated glass cloths and resin-impregnated non-woven fabrics can be used according to the required thickness of the laminated plate. As the metal foil, copper, aluminum, brass, nickel, iron or the like alone, an alloy or a composite foil is used, and an adhesive layer can be provided on one side of the metal foil if necessary. Thus, a resin-impregnated non-woven fabric is arranged on the upper and lower surfaces of the resin-impregnated glass cloth, and a laminate having metal foils on the upper and / or lower surfaces thereof is laminated and molded, and then cut to a required size to obtain a laminated plate. . The lamination molding and integration of the laminated body can be performed by selecting the curing time and the curing temperature depending on the resin, the base material, the thickness, etc., and a press, a double belt molding machine, a pressureless continuous construction method or the like can be used. After cutting, if necessary, reheating and rapid cooling can be performed to improve dimensional stability and appearance. The reheating is preferably performed at a temperature higher than the glass transition point (Tg) of the resin of the resin-impregnated base material, and the rapid cooling after the reheating is performed by cooling in a liquid such as low temperature water or alcohol, or in a low temperature gas. Then, it is preferable to put it in water at 25 ° C. or lower.

The present invention will be described below based on examples.

[0007]

Example A glass cloth having a thickness of 0.15 mm and a width of 105 cm is coated with a vinyl ester resin (Showa Polymer Co., Ltd., product number R
806-DA) on the upper and lower surfaces of two long vinyl ester resin-impregnated glass cloths impregnated with a resin amount of 45%,
A vinyl ester resin containing 20% talc (Showa Polymer Co., Ltd., product number R806-DA) was added to a long non-woven fabric having a thickness of 0.5 mm, a width of 105 cm and a unit weight index of 45, and a resin amount of 4.
A long vinyl ester resin-impregnated non-woven fabric impregnated to 5% is laminated on each one, and the upper and lower surfaces have a width of 105c.
m, a long laminated body in which a long copper foil having a thickness of 0.035 mm is arranged is continuously laminated at 170 ° C. for 20 minutes without pressure and then cut into 100 cm squares with a cutter to obtain a 1.2 mm thick sheet. Laminates were obtained continuously.

[0008]

Comparative Example A laminated plate having a thickness of 1.2 mm was continuously obtained by the same process as in Example except that a nonwoven fabric having a unit weight index of 95 was used.

Table 1 shows the performance of the laminates of Examples and Comparative Examples. The silver migration property was obtained by applying DC 100V, treating at 60 ° C. and 95% humidity for 1000 hours.

Hole shrinkage is punch diameter 1.0mm and 1.3m
This is the case with m.

[0011]

[Table 1]

[0012]

The present invention is constructed as described above. It has been confirmed that the laminated plate having the constitution described in the claims and the method for producing the laminated plate can improve the silver migration property of the obtained laminated plate and that the present invention is excellent.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuro Mitsuto 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (2)

[Claims] 1. A laminated board in which a required number of resin-impregnated non-woven fabrics are arranged on the upper and lower surfaces of a required number of resin-impregnated glass cloths, and a metal foil is disposed on the upper surface and / or the lower surface of the nonwoven fabric.
A laminate having a unit weight index of 30 to 85, which is represented by [nonwoven fabric single weight / laminate thickness]. 2. A long laminate in which a required number of long resin-impregnated nonwoven fabrics are arranged on the upper and lower surfaces of a required number of long resin impregnated glass cloths, and further long metal foils are arranged on the upper and / or lower surfaces thereof. In the method for manufacturing a laminated board, the laminated piece is continuously laminated and then cut to a required size, and the unit weight index of the nonwoven fabric represented by [nonwoven fabric unit weight / laminated plate thickness] is 30 to 85. A method for manufacturing a laminated board, comprising: