JP3211561B2 - Manufacturing method of single-sided copper foil clad laminate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electronic equipment, electrical equipment,
The present invention relates to a method for manufacturing a single-sided copper foil-clad laminate used for computing equipment, communication equipment, and the like.

[0002]

2. Description of the Related Art Conventionally, a plurality of prepregs obtained by impregnating a resin into a cellulose-based paper base material are laminated,
, The copper foil having a shiny side and a roughened surface, a laminate formed by laminating a roughened surface of the copper foil inwardly, small metal plate than the laminate the laminate from above and below And a method for producing a single-sided copper foil-clad laminate that is sandwiched by heat and pressure-formed. In general, this type of single-sided copper foil-clad laminate manufacturing method employs multi-stage molding in which the laminate sandwiched between the metal plates is vertically stacked in plural stages and simultaneously heated and pressed. In the method for manufacturing a single-sided copper foil-clad laminate as described above, the peripheral portion of the prepreg (or copper foil) of the laminated body disposed on the upper stage, which protrudes from the metal plate, is softened during heating and pressing. The resin hangs down on the glossy surface of the periphery of the copper foil (or prepreg) of the laminated body disposed at the lower stage, and the molten resin is cured in this state. After the completion of the heat and pressure molding, the obtained single-sided copper foil-clad laminate (hereinafter abbreviated as a laminate) is lifted in order from the top using, for example, a suction pad or the like, and the laminate and the metal plate are disassembled. . However, at this time, since the adhesive force between the glossy surface of the copper foil and the resin is strong, the peripheral portions of the upper laminate and the lower laminate adhere to each other, forming a bag shape and holding the metal plate. Lift it up. Therefore, the work of disassembling the laminated plate and the metal plate is temporarily interrupted, and an artificial work of separating the upper laminated plate and the lower laminated plate is required, which has a disadvantage of reducing productivity. .

[0003]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned drawbacks, and an object of the present invention is to disassemble a laminate and a metal plate obtained after heating and pressing. An object of the present invention is to provide a method for manufacturing a single-sided copper foil-clad laminate with improved productivity and improved productivity.

[0004]

According to a first aspect of the present invention, there is provided a method of manufacturing a single-sided copper foil-clad laminate, comprising: laminating a plurality of prepregs obtained by impregnating a cellulose-based paper base material with a resin; , the copper foil having a shiny side and a roughened surface, a laminate formed by laminating a roughened surface of the copper foil inwardly, small metal plate than the laminate the laminate from above and below In the method for producing a single-sided copper foil-clad laminate, which is sandwiched between and further heated and pressed, the glossy surface of the copper foil includes gold of chromium and zinc.
Chromium present on the glossy surface is 0.013 mg / dm ² or less and zinc is 0.1
35 mg / dm ² or less, the arithmetic average roughness (Ra) of the surface roughness is 0.35 μm or less, and the maximum height (Rma).
x) is Ri der less 3.5 [mu] m, the prepreg resin containing
Content is 50% by weight or less;
The resin used in the above is a phenol resin composition .

Hereinafter, the present invention will be described in detail. In the present invention, a prepreg obtained by impregnating a cellulose-based paper base material with a resin is used. As the paper base, for example, kraft paper, linter paper, or a paper base obtained by mixing inorganic or organic substances with kraft paper or linter paper can be used.

As the above resin, for example, a phenol resin, a cresol resin, a polyester resin, an epoxy resin, etc. alone, a mixture, a modified product or the like is used. If necessary, a curing agent, a curing accelerator, It is used by blending various additives such as a flame retardant and an organic or inorganic filler.

[0007] The prepreg is prepared by impregnating a resin varnish prepared by dissolving the resin in an appropriate solvent with the paper base and drying the resin to remove the unnecessary solvent. Is obtained. At this time, the resin content of the prepreg is desirably 50% by weight or less. When the resin content of the prepreg is large, the amount of the resin that melts and flows out from the periphery of the metal plate at the time of heating and pressing is increased, and the adhesion of the resin to the glossy surface of the copper foil is likely to occur. It is.

The method for producing a single-sided copper foil-clad laminate of the present invention comprises:
The prepreg laminating a plurality, on the upper surface thereof, a copper foil having a shiny side and a roughened surface, to form a laminate by laminating the roughened surface of the copper foil inwardly. The roughened surface of the copper foil is a surface having a large surface area by roughening the surface in order to improve the adhesion with the prepreg layer, and the glossy surface is not subjected to the treatment such as the roughened surface. The surface is smooth and shiny.

In general, the glossy surface of a copper foil is subjected to a surface treatment with a metal such as chromium, zinc or the like in order to prevent oxidation and improve compatibility with solder. In the present invention, in order to prevent the resin from adhering to the glossy surface of the copper foil, the copper foil has a chromium abundance (hereinafter referred to as Cr amount) on the glossy surface of 0.013 mg / dm ² or less. And the amount of zinc (hereinafter referred to as Zn amount) is 0.135
What has been subjected to a surface treatment of not more than mg / dm ² is used. When the amount of Cr and the amount of Zn on the glossy surface of the copper foil are respectively equal to or less than the above values, the glossiness of the copper foil and the ease with which the resin is adapted can be reduced, and the adhesion can be reduced. is there.

Further, in the present invention, in order to prevent the resin from adhering to the glossy surface of the copper foil, the surface roughness of the glossy surface of the copper foil is determined by the arithmetic average roughness in JIS-B-0601. It is essential to use a material having a height (Ra) of 0.35 μm or less and a maximum height (Rmax) of 3.5 μm or less. That is, by increasing the smoothness of the glossy surface of the copper foil, the resin is less likely to adhere.

[0011] The method for producing a single-sided copper foil-clad laminate of the present invention comprises:
The laminated body is sandwiched from above and below by a metal plate smaller than the laminated body, these are stacked in a plurality of stages, and heated and pressed to obtain a single-sided copper foil-clad laminate. At this time,
The peripheral portion of the prepreg of the laminated body arranged in the upper stage, which protruded from the metal plate, softened and hanged down on the glossy surface of the peripheral portion of the copper foil of the laminated body arranged in the lower stage, or melted in this state The resin cures. After the completion of the heat and pressure molding, the obtained single-sided copper foil-clad laminate (hereinafter abbreviated as a laminate) is lifted in order from the top using, for example, a suction pad or the like, and the laminate and the metal plate are disassembled. . In the present invention, the adhesive strength between the resin and the glossy surface of the copper foil is reduced, and the peripheral portions of the upper laminate and the lower laminate do not adhere to the resin, and the upper laminate does not adhere. When the is lifted, the lower laminate is easily peeled off by its own weight, and the work of disassembling the laminate and the metal plate can be performed efficiently without delay.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.

Preparation of Prepreg Used in Examples 1 to 3 and Comparative Examples 1 to 4 390 g of metacresol, 150 g of tung oil, 45 g of 37% by weight formalin, and 25% by weight of aqueous ammonia 18
The mixture was refluxed at a temperature of 100 ° C. for 60 minutes, dehydrated, and charged with 300 g of methanol to obtain a tung oil-modified phenol resin solution. Further, to the above solution, 15% by weight of tetrabromobisphenol A and 5% by weight of tricresyl phosphate as flame retardants were added to the solid content of the tung oil-modified phenol resin, and an epoxy resin (manufactured by Ciel Chemical Co., Ltd.) was added. , Epicoat 1120-80
M) was added at 4% by weight to obtain a resin varnish. This resin varnish was impregnated into kraft paper having a unit weight of 117 g / m ² and dried to prepare prepregs having resin contents as shown in (Table 1) for each of Examples 1 to 3 and Comparative Examples 1 to 4.

Production of Laminated Plates of Examples 1 to 3 and Comparative Examples 1 to 4 Each of Examples 1 to 3 and Comparative Examples 1 to 4 was as shown in (Table 1). A laminate was prepared using the prepreg and the copper foil. That is, as shown in FIG. 1, eight prepregs (2) are laminated, and a copper foil (1) having a glossy surface and a roughened surface on its upper surface is placed inside the roughened surface of the copper foil (1). The laminate (4) is formed by laminating in a direction, the laminate (4) is sandwiched from above and below by metal plates (3) and (3) smaller than the laminate (4), and the temperature is further increased by a molding press. It was heated and pressed under the conditions of 160 ° C., pressure of 120 kg / cm ² and 60 minutes, then cooled and decompressed to obtain a laminate. The obtained laminate was lifted in order from the top using suction pads, and the laminate and the metal plate were disassembled. At this time, in Examples 1 to 3, the laminated plate arranged in the upper stage and the laminated plate arranged in the lower stage could be easily separated, but in Comparative Examples 1 to 4,
Since the laminated plate arranged in the upper stage and the laminated plate arranged in the lower stage adhered to each other at the peripheral portion thereof by adhesion of the cured resin, manual work was required to insert and insert a spatula into the adhesive portion. The results are shown in (Table 1). In the evaluation items of the adhesion between the glossy surface of the copper foil and the prepreg in (Table 1), "None" means that the lower laminate was peeled off by its own weight when the upper laminate was lifted by the suction pad. ,
“Present” indicates that when the upper laminate was lifted by the suction pad, the lower laminate together with the upper laminate was lifted without peeling.

[0015]

[Table 1]

[0016]

According to the method for producing a single-sided copper foil-clad laminate of the present invention, a plurality of prepregs obtained by impregnating a resin with a cellulose-based paper base material are laminated, and a glossy surface and a roughened surface are formed on the upper surface. , A laminated body is formed by laminating the roughened surface of the copper foil inward, sandwiching the laminated body from above and below with a metal plate smaller than the laminated body, and further heat-press molding. In the method for producing a laminate, the chromium abundance on the glossy surface of the copper foil is 0.013 mg / dm ² or less, the zinc abundance is 0.135 mg / dm ² or less, and the arithmetic average roughness of the surface roughness ( By using the copper foil having Ra) of 0.35 μm or less and the maximum height (Rmax) of 3.5 μm or less, the adhesion between the resin and the glossy surface of the copper foil is reduced. Therefore, even if a laminated board is manufactured by adopting a multi-stage molding at the time of heat and pressure molding, the periphery of the upper laminated plate and the lower laminated plate does not adhere to the above resin, and the upper laminated plate is not attached. When the is lifted, the lower laminate is easily peeled off by its own weight, and the work of disassembling the laminate and the metal plate can be performed efficiently without delay. Therefore, productivity is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration at the time of heat and pressure molding in a method for producing a single-sided copper foil-clad laminate of the present invention.

[Explanation of symbols]

 1 copper foil 2 prepreg 3 metal plate 4 laminate

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-299834 (JP, A) JP-A-5-275817 (JP, A) JP-A-56-152299 (JP, A) JP-A-63- 252777 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B32B 15/08

Claims (1)

(57) [Claims] A prepreg obtained by impregnating a resin with a cellulose-based paper base material is laminated on a plurality of layers, and a copper foil having a glossy surface and a roughened surface on an upper surface thereof is formed on the roughened surface of the copper foil. Are laminated inward to form a laminate, and the laminate is sandwiched between metal plates smaller than the laminate from above and below, and further heated and pressed to form a single-sided copper foil-clad laminate. The glossy surface is surface treated with chrome and zinc metal
The chromium abundance on this glossy surface is 0.013 mg
/ Dm ² or less, the amount of zinc present is 0.135 mg / dm ² or less, and the arithmetic average roughness (Ra) of the surface roughness is 0.
35μm or less and a maximum height (Rmax) is Ri der less 3.5 [mu] m, the resin content of the prepreg is 50 wt% or less
Further, the resin used in the prepreg is
A method for producing a single-sided copper foil-clad laminate , which is a knol resin composition .