JPH0220337A - Preparation of laminated sheet - Google Patents

Abstract

PURPOSE:To increase the stiffness of an extremely thin metal foil, to eliminate wrinkles and breakage, and to reduce an inferiority rate, cost and a working process by laminating a metal foil provided with a resin layer to a surface, on which a resin impregnated base material is superposed, to perform molding. CONSTITUTION:Laminates each of which is formed by arranging a metal foil having a thickness of 3-12mum provided with a resin layer in a thickness of 1-100g/m<2> to the upper surface and/or lower surface on which a required number of resin impregnated base materials are superposed are laminated and molded. As the resin of the resin impregnated base material to be used, a phenol resin, a cresol resin, an epoxy resin and a fluorocarbon resin are used alone or in a mixed state or modified resins thereof are used. As the base material, there are a fabric, a nonwoven fabric, a mat, paper or a combination thereof composed of an inorg. fiber of glass or asbestos, an org. synthetic fiber of polyester or acrylic resin or a natural fiber. The metal foil provided with the resin layer is composed of copper, aluminum, iron or the like, an alloy thereof or a composite product thereof.

Description

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

[Conventional technology]

Laminated boards form electrical circuits on the metal foil on the surface and are used for printed wiring boards and multilayer printed wiring boards.Recently, fine patterns have increased, and the metal foil on the surface of the laminate has 3 to 1
Ultra-thin metal foil with a thickness of 2 microns is used. However, these ultra-thin metal foils with a thickness of 3 to 12 microns are not stiff, and wrinkles and folds occur during handling, increasing the defective rate. As a countermeasure to this, carrier foil is attached to ultra-thin metal foil and integrated to make it thicker.
It had to be removed by etching, etc., which resulted in an increase in cost and work steps.

[Problems that the invention attempts to solve]

As described in the related art section, if ultra-thin metal foil is used as it is, wrinkles and folds will occur, increasing the defective rate, and if it is used with carrier foil attached, costs and work steps will increase. The present invention has been made in view of the above-mentioned problems in the conventional technology, and its purpose is to provide a method for manufacturing a laminate that can reduce the defective rate, cost, and work process. .

[Means to solve the problem]

The present invention involves laminating and molding a laminate in which metal foil with a thickness of 3 to 12 microns and a resin layer of 1 to 10 f/v1 is disposed on the upper and/or lower surfaces of a required number of resin-impregnated substrates. Due to the unique manufacturing method of the laminate, the stiffness of the ultra-thin metal foil becomes strong, there are no wrinkles or bends, and the cine yield is reduced. Also, since no carrier foil is used, there is no need for carrier foil costs. Moreover, the step of removing the carrier foil is also unnecessary, and the present invention will be described in detail below.

Examples of resins for the resin-impregnated base material used in the present invention include phenolic resin, cresol resin, epoxy resin, unsaturated polyester resin, melamine resin, polyimide, polybutadiene, polyamide, polyamideimide, phorisulfon,
Polyphenylene sulfide, polyphenylene oxide, polybutylene terephthalate, polyether ether ketone, fluorinated resin, etc. alone, modified products, mixtures, etc. are used. Water, methyl alcohol, acetone, cyclohexanone, styrene, etc. are used to adjust the viscosity as necessary. The base materials include inorganic fibers such as glass and asbestos, polyester, polyamide, polyvinyl alcohol, acrylic, etc. Woven fabrics, non-woven fabrics, mats, etc. made of synthetic lj & natural fibers such as fibers and cotton. is paper or a combination of these materials, etc. Copper is used as the metal foil for resin-coated metal foil.
A metal foil made of single, alloy, or composite materials such as aluminum, iron, nickel, and zinc, on one side of which is impregnated with a resin selected from the group of resins used for resin-impregnated base materials with a dry resin amount of 1 to 1.
The thickness of the metal foil is 3 to 12 microns. That is, the amount of resin is l
If it is less than fβ, it is not possible to strengthen the stiffness of the ultra-thin metal foil,
If it exceeds 1001/W, it will flow out during lamination molding and contaminate the laminated plate. Further, if the thickness of the metal foil is less than 3 microns, even if a resin layer is provided, it cannot be made stiffer, and if it exceeds η microns, the stiffness will be strong even without a resin layer, and there is no point in providing a resin layer.

As for lamination molding, a multi-stage press method, a multi-roll method, a double belt method, a pressureless lamination molding method, a vacuum molding method, etc. are used, and there are no particular limitations.

The present invention will be explained below based on examples.

Examples 1 to 3 Epoxy resin (manufactured by Shell Chemical Co., Ltd., product number Epicor)
1001) An epoxy resin face of 0.2 ff thickness was added to 4 parts of dianediamide, 0.2 parts of benzyldimethylamine, and 100 parts of methyl oxide-A to 100 parts by weight (hereinafter referred to simply as parts). The amount of resin after drying the glass cloth is (weight) 96 (hereinafter simply written as %)
The amount of resin after drying was applied to the upper and lower surfaces of 7 resin-impregnated base materials obtained by impregnating and drying so that the amount of resin after drying was 5 for Example 1 and 50 f for Example 2.
/d, for Example 3, a laminate in which copper foil with a resin layer was coated and dried to a thickness of 3 microns so as to have a thickness of 90 ff1l was molded at a pressure of 4 Dkg, 7 匈, 16
Lamination molding was performed at 5°C for 120 minutes to obtain a double-sided steel clad laminate with a thickness of 1.6H.

Comparative Example 1 A laminate was obtained in the same manner as in the example except that the copper foil with a thickness of 3 microns was used as it was.

Comparative Example 2 A laminate was obtained in the same manner as in Example except that a metal foil in which a 3 micron thick copper foil was integrated with a 3 micron thick aluminum foil as a carrier foil was used.

The performance of the laminates of Examples 1 to 3 and Comparative Examples 1 and 2 was the first.
It looks like a table.

Table 1 note This is the ratio when Comparative Example 1 is set as 100.

〔Effect of the invention〕

The present invention is constructed as described above. The method for manufacturing a laminate having the structure described in claim 1 has the effect of reducing the defective rate, cost, and work man-hours.

Claims (1)

[Claims] (1) A resin layer of 1 to 100 g/m^3 is applied to the upper and/or lower surfaces of the required number of resin-impregnated substrates, with a thickness of 3 to 1
A method for manufacturing a laminate, characterized by laminating and molding a laminate on which 2 micron metal foil is arranged.