JPS6189400A - Paper - 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 Object of the Invention (Field of Application) This invention relates to paper used as a material for printed circuit boards, etc.

(Prior Art and Problems to be Solved by the Invention) Conventionally, when manufacturing printed circuit boards, paper containing glass fibers was impregnated with phenol resin, and then the paper was laminated and fixed. However, in this conventional printed circuit board, there was a problem in that the manufacturing cost of paper increased because glass fiber was expensive. Further, since glass fiber is hydrophobic, there is a problem in that it is difficult to make paper using normal paper making methods.

Structure of the Invention (Means and Effects for Solving the Problems) In order to solve the above problems, in the present invention, paper is made using paper stock containing mica. As a result, paper with excellent electrical insulation properties can be provided at low cost and can be effectively used as a material for printed circuit boards and the like.

(Example) Hereinafter, an explanation will be given with reference to an example that embodies this investigation.

Now, when producing a paper stock containing mica, mica is mixed in a predetermined ratio and dispersed in water.

Next, a bitter consisting of denopone, acrylic acid ester, etc. is added to the dispersion and stirred, and the bitter binds the mica and the material constituting the paper layer to cause them to coagulate.

Further, at the same time as the binder, a fixing agent such as a cationic evoquinated polyamide borea ε-resin aqueous solution is added and mixed to improve the fixing properties of bi-goo and mica to the paper layer constituent materials. The aggregates produced by the above process are also passed through paper stock (50 to 100 mesh).
By filtration, mica-containing paper with excellent electrical insulation properties can be produced at low cost. Furthermore, there is no risk that only the mica powder will pass through the screen during paper making and pollute the circulating water for paper making.

In addition, as the natural bulb of the paper layer constituent material, wood bulb, @leather #l fiber 1 type hair fiber 1 leaf LA fiber can be used, and as the paper layer constituent material of the synthetic fiber and non-83 fiber, polypropylene, polyethylene, glass fiber.

Rock wool, carbon fiber, asbestos, alumina, etc. can be used. In addition to those mentioned by OSI, binders include modified starch, vegetable gum, carboxymethylcellulose (CMC), polyvinyl alcohol (Pvc).
), polyacrylamide.

Gopite C8-Phlo8-Ph1o; 2M in the composition formula
g4(A 12814010) (0IL)4),
Muscovite [MH3c (Hite; composition formula is 2A1
4 (A1□5160□.) (OH)4), L-phlogopite, etc. can be used.

According to the above-mentioned manufacturing method, mica and the paper layer constituent material are firmly bonded by the binder and the fixing agent, so even if the mica content is increased, the difference in specific gravity between the two (mica Specific gravity: approximately 2.85. There is a risk that a separation layer will be formed based on the specific gravity of wood pulp (Q, 65 to 0.7), or that only the mica powder will flow out from the plow net and pollute the circulating water. It is possible to improve paper-making properties and produce strong paper without any problems.Furthermore, there is no possibility of mica peeling off after paper-making.

In particular, when starch or acrylic ester is used as a binder and natural valve is used as a material constituting the paper layer, the natural valve is negatively charged in the dispersion, and ni
Since the I'IL in the dispersion does not change by adding the binder described in I, the fibers can be efficiently aggregated by adding a cationic epoxylated polyamide amine (fixing agent). In this case, I'll of the dispersion
There is no need to add an aqueous aluminum sulfate solution for adjustment.

In addition, when using wood pulp as a paper layer forming material, the 111 group q degree should be adjusted to 10 to 20 degrees SR when preparing the material.
If the porosity is maintained at the level of (Noyotsu Parrigler), paper with porosity comparable to that of blotting after papermaking can be obtained. Therefore, it is possible to improve the impregnating property of the paper with phenol resin, etc., which is more advantageous in manufacturing printed circuit boards.

Next, specific examples will be described.

In this example, N-BKI' (softwood bleached kraft valve) was adjusted to a beating degree of 20°SR in advance, and this N-BKP
20 wt.
While stirring at a speed of 0 r, p, nl, 3.0% starch powder was added to the slurry and mixed and stirred. Furthermore, 2.0% acrylic acid ester emulsion
Add and mix. In addition, in order to perform the above-mentioned regular treatment, an evoquinated polyamide polyamine aqueous solution was added to the raw materials (bulbs and mica powder) at 0°7% in terms of solid content.
20-30", ■) and 1N were stirred and mixed to form a floc (aggregate of particles aggregated by electric force). In order to further coarsen the floc, nonionic polyethylene oxide was added. Resin aqueous solution (average molecular weight 3
00,000 to 500,000.

30 ppm of viscosity 900-8000 c, pS) was added to the raw materials and mixed.

The paper stock obtained by the above treatment was diluted to a papermaking concentration of 0.4%, and a mica-containing paper was made using a regular cloth screen. Then, the paper thickness, density 4 specific resistance, specific bursting strength, etc. of the mica-containing paper were measured. The results are shown in Table 2. In addition, mica-containing paper was made using raw materials having a mixing ratio different from the mixing ratio exemplified in the above example, and the mixing ratio and measurement results are also shown in Table 2. In addition,
The specific resistance was measured with a horizontal opening Hewlett Packard Co., Ltd. insulation resistance meter, and the measurable range was 5X10 at 100cm.
6 to 2×10” Ω-eln. The specific bursting strength was measured by the method according to 115I'8112.

By the way, the resistivity of conventional paper containing glass fiber is 1x i
Since the mica-containing paper is about 12 Ω·cm, it is suitable to use mica-containing paper as a pleated substrate with a mica content of 40 to 96 weight type.

Table 1 Chemical composition of mica (weight h1%) Table 2 Physical properties of mica-containing paper

Claims (1)

[Claims] 1. A paper characterized by being made from a stock containing mica. 2. The paper according to claim 1, wherein the mica content in the paper stock is 40% to 96% by weight. 3 Disperse a mixed paper stock in which the paper layer constituent material and mica are mixed in water, add a binder to the dispersion, and stir it to aggregate the paper layer constituent material and mica, and make paper with the aggregate. The paper according to claim 1, characterized in that: