JPH06170843A - Production of laminate - Google Patents

Abstract

PURPOSE:To obtain a molded laminate hardly generating poor appearance, such as impression and pit, by a method wherein prior to a hot pressure molding process, a top surface and/or an end face of a prepreg or a laminated prepreg is treated by adhesive rollers. CONSTITUTION:In a method for producing a laminate from a prepreg made of a glass fiber cloth as a substrate impregnated with a thermosetting resin, prior to a hot pressure molding process, a top surface and/or an end face of the prepreg or laminated prepreg is treated by adhesive rollers. This adhesive roller is made of an adhesive synthetic resin. Resin powder and glass powder adhering to the prepreg are transferred to the adhesive roller to be removed. The adhesive roller preferably has a relatively small adhesive power. When a single prepreg is treated, adhering matters on the top surface is removed by passing the prepreg through a pair of adhesive rollers. Adhering matters on the end face can be removed by passing the prepreg with small-size adhesive rollers applied thereto. It is preferable that a laminated prepreg is similarly treated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a laminated board such as a copper clad laminated board and a substrate for a multilayer printed circuit board, which eliminates generation of resin or glass fiber powder from a prepreg,
This is intended to prevent the appearance of the laminated plate from being defective.

[0002]

2. Description of the Related Art A prepreg made of a glass fiber cloth as a base material and impregnated with a thermosetting resin often has powder of resin or glass fiber adhered to the surface thereof. Is likely to drop out. For this reason, the resin and the glass fiber powder are blown up between the prepreg and the copper foil, set in a press, and heated and pressed, and adhere to the surface of the copper foil. As a result, appearance defects such as dents and pits occur on the surface of the finished laminate. Conventionally, as a method for preventing such a defective appearance of the laminated board, Japanese Patent Laid-Open No. Sho 64-64
A method of passing a prepreg between rolls is known as in Japanese Patent No. 85229, but the problem that the powder is generated during subsequent cutting and loading of the prepreg has not been solved.

As another method, a method of using a dust collector to clean the room in various steps as described above has been adopted, but this is not sufficient, and a complete solution has not yet been reached. Not in. Further, after cutting the prepreg, the cut portion and the surface are melted (JP-A-61-61).
However, it is difficult to control the temperature because there is a case where the reaction of the resin further proceeds or the melting is insufficient in some cases.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a laminated plate such as a copper clad laminated plate in which a defective appearance such as a dent or a pit hardly occurs in the formed laminated plate. To do. Here, the dent means a pock-like stain caused by the resin powder adhering to the copper foil surface, and the pit means an indentation caused by the glass fiber adhering to the copper foil surface.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a method for producing a laminate using a glass fiber cloth as a base material and using a prepreg impregnated with a thermosetting resin, prior to the heating and pressurizing step, the prepreg. Alternatively, the present invention relates to a method for producing a laminated plate, which comprises treating the surface and / or the end surface of the prepreg laminate with an adhesive roller. The method of treating the prepreg or the prepreg laminate with an adhesive roller is specifically as follows. The adhesive roll is formed of an adhesive synthetic resin, and examples of such synthetic resin include polyisobutylene and butylene-isobutylene copolymer. Since the adhesive roll is for transferring and removing the resin powder or glass powder adhering to the prepreg, it is preferable that the adhesive force is relatively small.

When treating one prepreg, the adhering substances on the surface can be removed by passing it between a pair of adhesive rollers, but it is also possible to use two or more pairs of rolls. The end face may be applied by passing it through a small pressure-sensitive adhesive roll, but it is preferable to treat the prepreg laminate in the same manner. When the surface of the laminate of prepregs is treated, it may be passed through between the pair of adhesive rollers, but the thickness of the laminate becomes large, so that it is necessary to take an appropriate gap between the rollers.

[0007]

Example A prepreg was prepared as follows. (1) A prepreg (referred to as prepreg A) was obtained by impregnating and drying an epoxy resin using a glass fiber woven fabric as a base material. (2) A prepreg (referred to as prepreg B) was obtained by impregnating and drying an epoxy resin with a glass fiber nonwoven fabric as a base material. (3) The prepregs A and B were passed through a pair of adhesive rollers to obtain prepregs (referred to as prepregs C and D).

Example 1 A prepreg A was attached to each of the upper and lower surfaces.
Each sheet was overlapped with three sheets of prepreg B, and then a pair of adhesive rollers were passed through to treat the surface, and at the same time, the end faces were passed through the adhesive rollers. A copper foil was laminated on both surfaces of this prepreg and heat-pressed by a conventional method to obtain a double-sided copper-clad laminate. << Example 2 >> One prepreg C was placed on each of the upper and lower surfaces, and three prepregs D were superposed between them, and then a pair of adhesive rollers were passed through to treat the surface, and at the same time, the end faces were passed through an adhesive roller. . A copper foil was laminated on both surfaces of this prepreg and heat-pressed by a conventional method to obtain a double-sided copper-clad laminate. << Comparative Example 1 >> One prepreg A is placed on each of the upper and lower surfaces, and three prepregs B are placed between them, copper foil is further placed on both surfaces, and heat-press molding is performed by a conventional method to obtain a double-sided copper-clad laminate. It was

The copper clad laminates obtained in each of the above examples were inspected for appearance, and the results shown in Table 1 were obtained. It is understood that the examples have a better appearance than the comparative examples.

[Table 1]

[0010]

EFFECTS OF THE INVENTION The laminated plate obtained by the present invention has almost no visual defects such as dents and pits. With the increasing density and thinning of printed wiring boards, the demand for defect-free copper foil surfaces is increasing today, and the laminated board obtained by the present invention is extremely effective as a means for improving its quality and yield. .

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Claims (1)

[Claims] 1. A method for producing a laminated sheet using a glass fiber cloth as a base material and using a prepreg impregnated with a thermosetting resin, the surface of the prepreg or the prepreg laminate, and Or the manufacturing method of the laminated board characterized by treating an end surface with an adhesion roller.