JPS62221535A - Single-sided metallic-foil lined composite laminated board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a single-sided metal foil-clad composite laminate which is inhibited from warping and twisting.

[Prior art] Composite laminates are composed of a core layer made of a paper base material impregnated with epoxy resin and both surface layers made of woven glass cloth impregnated with epoxy resin, which are integrated by heating and pressing. be. Core/l! As the paper base material for the ', paper made from linter pulp or paper made from wood pulp is generally used.

Problems to be Solved by the Invention By the way, in a composite laminate formed by bonding one side (two metal foils) together, it is difficult to prevent curing shrinkage of the surface resin layer on the metal foil side during the heating and pressure forming process. protected,
A so-called positive warpage occurs in the laminate, which is a convexity on the metal foil side. When the metal foil is partially removed during circuit processing, the surface resin layer, which had been suppressed from shrinking due to the presence of the gold foil, shrinks due to the disappearance of the metal foil, and now the metal foil is removed. Negative warpage occurs with the foil side being concave.

These factors have hindered the automatic insertion of chip components, such as the printing of resist ink and insulating ink during circuit processing.

In view of these points, an object of the present invention is to provide a single-sided metal foil-clad composite laminate that suppresses the occurrence of warping and twisting.

In order to achieve the object described above, the present invention provides a single-sided metal foil-clad composite laminate Cj as described in the prior art;
The paper base material on the side closer to the metal foil of the core layer is made of linter pulp, and the paper base material on the side farther from the metal foil is a mixed paper of wood pulp and linter pulp (wood pulp content t5-20 wt).
%).

Function Linter pulp is made of 100% Habopi cellulose, and α-cellulose has a high degree of polymerization and high crystallinity, so it has excellent dimensional stability. -Manzoku Harubu is 70-85
In the case of linter pulp, which contains α-cellulose and other cellulose (wt%), its dimensional stability is not good.

The present invention suppresses curing shrinkage of the resin by using a paper base material made from linter pulp, which has good dimensional stability, on the side near the metal foil of the core layer (-), and on the side far from the metal foil of the core layer, The stress on both sides of the laminate is balanced by using it as a base material for mixed paper made of wood pulp and linter pulp in a range of proportions.

Similarly, the metal foil referred to here includes copper, aluminum, nickel-chromium base, and the like.

Example Next, one embodiment of the present invention will be described.

Epoxy resin (Epicoat 1001 manufactured by Yuka Shell) 10
A composition containing 0 parts by weight, 4 parts by weight of dicyandiamide, and 0.5 parts by weight of benzyldimethylamine was impregnated into a glass woven fabric to a resin content of 40 wt% (2 impregnated, dried, and prepared as a prepreg for surface 1). .

-10,000, paper 2 made from linter pulp and mixed paper of wood pulp and linter pulp with a wood pulp content of 1 Q wt (2) 100 parts by weight of epoxy resin (Epon 1045 manufactured by Yuka Shell Co., Ltd.), 4 parts by weight of dicyandiamide, penzyl dimethyl at
The total resin t 60
It was impregnated and dried to give a prepreg for the core layer, respectively, so as to achieve a concentration of wt%.

Between the two prepregs for the surface layer, two of each of the two types of prepregs for the core layer, a total of four sheets, are stacked and interposed, and among the prepregs for the core, a paper base made from linter pulp ≦: close Place copper foil on the side surface and apply pressure 50Kg/a
j, temperature: 150 tl: heated and pressed for 45 minutes, 1.
A single-sided steel-clad composite laminate plate with a thickness of 211 m was obtained.

Comparative Example I In the same manner as in Example L, except that instead of the mixed paper containing 10 wt % of wood pulp 1, a mixed paper containing 3 owt % of wood pulp was used. ! A liI plate was obtained.

Comparative Example 2 In Nijikiji 1 @ example, copper foil is placed on the surface of 11111, which is close to the prepreg for the core layer made of mixed paper as the base material! A laminate was obtained in the same manner f2 except for the arrangement.

Comparative Example 3 Is the core layer all linter pulp? A laminate was obtained in the same manner as in the example except that the paper base material was used as a raw material.

Comparative Example 4 A laminate 7 was obtained in the same manner as in the example except that all the core layers were made of the same mixed paper as in the example.

Upon receiving the laminates after molding in the above Examples and Comparative Examples,
After etching and removing the entire copper foil, T2-0.5/15
Figure 1 shows the change in warpage after the 0 treatment. The amount of warpage is 50
0x5 (lom+ test piece? Place 41+- on a flat surface plate,
The maximum value of the amount of lift at the four corners ']' The loss was fixed at 11.

Comparative Example 1 shows that when the content of wood pulp in the mixed paper is increased too much, the effect of suppressing warpage decreases.

Effects of the Invention As is clear from Fig. 1, the present invention can suppress warping to a minimum even after forming the laminate and through the various subsequent processing steps, and its industrial value is extremely large. .

[Brief explanation of drawings]

FIG. 1 is a curve diagram showing the change in warpage of a single-sided steel-clad composite laminate during various processing steps. Patent amount 1♀ [1 person W [Kami PF5 Shiki Co., Ltd. Representative Director Yasuo Sakurai

Claims (1)

[Claims] In a composite laminate consisting of a core layer made of a paper base impregnated with epoxy resin and both surface layers made of woven glass fabric impregnated with epoxy resin, with metal foil integrated on one surface, the metal foil of the core layer The side closer to the metal foil is made of paper base material made from linter pulp, and the side far from the metal foil is made of a mixed paper of wood pulp and linter pulp (wood pulp content 5-20wt).
%) Single-sided metal foil-clad composite laminate made of paper substrate.