JPH06226912A - Phenolic laminated sheet - Google Patents

Abstract

PURPOSE:To provide a phenolic laminated sheet which is free from odor of base material impregnated with resin and a laminated sheet and excellent in heat resistance. CONSTITUTION:Formaldehyde is reacted with phenols and thereafter a solvent dissolving phenols and/or formaldehyde is added. Phenolic resin is obtained by removing the solvent into which unreacted phenols and/or formaldehyde are dissolved. A phenolic laminated sheet is produced by impregnating base material with phenolic resin, providing a metallic foil on the top surfaces and/or the rear surfaces of the necessary number of sheets of base material impregnated with resin and unifying them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phenol resin laminate used in electronic equipment, electric equipment, calculators, communication equipment and the like.

[0002]

2. Description of the Related Art In recent years, phenol resin laminates have been mainly used for consumer electric equipment such as televisions, video equipments, audio equipments, etc.
The odor and formaldehyde odor became a problem, and further improvement in heat resistance was required in response to recent high-density wiring.

[0003]

As described in the prior art, the conventional phenol resin laminate has problems with odor and heat resistance. The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide a phenol resin laminate having excellent odor and heat resistance.

[0004]

In the present invention, after reacting phenols with formaldehyde, a solvent that dissolves the phenol and / or formaldehyde is added to the unreacted phenol.
A resin foil impregnated with a solvent and a solvent in which formaldehyde is dissolved is impregnated with a base material and dried, and a metal foil is provided on the upper and / or lower surface of the required number of resin-impregnated base materials. Because of the characteristic phenol resin laminate,
The present invention has been achieved, and the present invention will be described in detail below.

The phenol resin used in the present invention is a phenol resin.
, Phenol, cresol, xylenol, and the like, single or modified products, and mixtures of formaldehyde such as formalin and paraform under acidic or alkaline conditions, followed by dissolving phenol and / or formaldehyde in water, methyl A solvent such as alcohol, ethyl alcohol, propanol or butanol is added in a required amount to dissolve the unreacted phenol and / or formaldehyde, and then the solvent is removed to contain almost no unreacted phenol and / or formaldehyde. A phenol resin is obtained. The amount of unreacted phenol and / or formaldehyde is preferably 6% by weight (hereinafter simply referred to as%) or less in terms of the total amount of free phenol and formaldehyde. Good in terms of sex. In particular, the phenol resin modified with vegetable oil such as tung oil, castor oil, linseed oil, etc. has a large amount of unreacted phenol and / or formaldehyde, and the present invention is effective. If necessary, the phenol resin may be an inorganic powder filler such as talc, clay, silica, calcium carbonate or aluminum hydroxide, or a fiber filler such as glass fiber, asbestos fiber, pulp fiber, synthetic fiber or ceramic fiber. Can be included. As the base material impregnated with the phenol resin, glass, inorganic fibers such as asbestos, polyester, polyamide, polyacryl, polyvinyl alcohol, polyimide, organic fibers such as fluororesin, woven cloth, nonwoven cloth, paper of natural fibers such as cotton. However, it is preferable to use paper such as kraft paper and linter paper. Further, the resin may be impregnated only with the same resin, but a plurality of impregnations such as primary impregnation with a different type resin and secondary impregnation may be performed so that the impregnation may be more uniform. The resin amount of the resin-impregnated base material is 35
70% is preferable. Thus, the base material is impregnated with the resin and then dried by heating if necessary to obtain a resin-impregnated base material.
As metal foil, copper, aluminum, brass, nickel,
A single metal such as iron, an alloy, or a composite foil is used, and an adhesive layer can be provided on one surface of the metal foil if necessary. As for the integration condition, the curing temperature, the curing time and the molding pressure can be selected depending on the resin, the base material, the thickness and the like, and the manufacturing method such as the press method, the double belt molding method and the multi-roll method can be used.

The present invention will be described below based on examples.

[0007]

Example 1 To 100 parts by weight of phenol (hereinafter simply referred to as "part"), 60 parts of tung oil was added, and then 0.5 part of paratoluenesulfonic acid was added, and the mixture was heated at 75 ° C for 80 minutes to prepare a phenol. To obtain a tung oil phenol reaction product having an addition rate of 3.8%,
Then, 42 parts of 50% formalin was added to 100 parts of the tung oil phenol reaction product, and then triethylamine 0.5 was added.
Parts, 2 parts of 25% aqueous ammonia, and 100 at 75 ° C.
After heating for 1 minute, dehydration under reduced pressure, and then adding 15 parts of water at 30 ° C
After stirring and mixing for 60 minutes, unreacted phenol and / or formaldehyde was extracted into water, and then dehydrated under reduced pressure to obtain a phenol resin from which unreacted phenol and / or formaldehyde were removed. Then, the phenol resin is applied with a thickness of 0.2.
mm craft paper impregnated with 50% resin content,
A resin-impregnated base material was dried to obtain a laminated body in which seven resin-impregnated base materials were stacked and copper foil with an adhesive layer having a thickness of 0.035 mm was arranged on the upper and lower surfaces at a molding pressure of 100 Kg / cm ² and 160 ° C. 6
It was heated and pressed for 0 minutes to obtain a double-sided copper-clad laminate having a thickness of 1.6 mm.

[0008]

Example 2 A phenol resin was obtained in the same manner as in Example 1 except that methyl alcohol was used as the extraction solvent to obtain a laminate.

[0009]

[Comparative Example] A phenol resin was obtained in the same manner as in Example 1 except that the extraction solvent was not used to obtain a laminated plate.

Table 1 shows the performances of the phenolic resins and the laminates of Examples 1 and 2 and Comparative Example. The amount of unreacted material is the total content of free phenol and formaldehyde in the phenol resin.

[0011]

[Table 1]

[0012]

The present invention is constructed as described above.
In the phenol resin laminate having the constitution described in the claims, there is little unreacted substance in the phenol resin, the resin-impregnated base material and the laminate have almost no odor and excellent heat resistance. It was confirmed to be excellent.

Claims (2)

[Claims] 1. A phenol resin obtained by reacting phenols with formaldehyde, adding a solvent dissolving the phenol and / or formaldehyde, and removing the unreacted phenol and / or the solvent dissolving the formaldehyde. A phenol resin laminate, characterized in that a required number of resin-impregnated base materials obtained by impregnating and drying a base material are provided with metal foil on the upper surface and / or lower surface thereof. 2. The phenol resin laminate according to claim 1, wherein the amount of unreacted phenol and / or formaldehyde in the phenol resin is 6% by weight or less.