JPH06320697A - Manufacture of phenol resin laminated plate - Google Patents

Abstract

PURPOSE:To improve curability and to improve punching processability, water resistance, electric characteristics, mechanical characteristics by impregnating a base material with resin content in which specific resin is mixed with vernonia oil represented by a specific formula or its derivative of a specific amount, drying it, and laminating it. CONSTITUTION:As resin content to be impregnated to a base material for a laminated plate, resin in which vernonia oil represented by a formula or its derivative or 2.5-50 pts.wt. is mixed with 100 pts.wt. of phenol resin is used. The material is impregnated with the resin content, dried, laminated and molded. Since the oil mixed with the resin has an epoxy group, it has high reactivity and excellent curability. Its water resistance becomes excellent due to hydrophobic nature of the oil itself. As the phenol resin, phenol resin modified with drying oil such as paulownia oil or unmodified phenol resin, etc., is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a phenol resin laminate used for printed wiring boards, electrically insulating boards and the like.

[0002]

2. Description of the Related Art Recently, insulating substrates, particularly laminated plates and copper clad laminated plates used for communication devices and electronic equipment, are punched at room temperature or at a relatively low temperature near room temperature from the viewpoint of automation of processing equipment and energy saving. Those with excellent workability are required. For this reason, as a resin for a laminated board, a phenol / formaldehyde resin obtained by modifying various alkylphenols with phenol and modifying with tung oil or the like is usually used. However, since the curing rate of phenol / formaldehyde resin modified with tung oil is slow and the crosslink density is also low, the resin in the laminate tends to be insufficiently cured, resulting in heat resistance, mechanical strength,
Properties such as water resistance are deteriorated, and during punching, delamination is likely to occur due to the low crosslink density. Moreover, the price of paulownia oil tends to fluctuate significantly, which is also a disadvantage in securing stable raw materials.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a method for producing a phenol resin laminate having excellent curability, punching workability, water resistance, electrical characteristics and mechanical characteristics.

[0004]

According to the present invention, 100 parts by weight of a phenol resin as a resin component to be impregnated in a base material for laminated plates is represented by the vernonia oil represented by the following chemical formula (I) or its derivative 2.5 to 50. The present invention relates to a method for producing a phenolic resin laminate, which is characterized by using a resin mixed with parts by weight.

[0005]

[Chemical 2]

In the present invention, the derivative of vernonia oil has, for example, a structure represented by the following chemical formula (II), but is not limited thereto.

[0007]

[Chemical 3]

[0008] Vernonia oil is a vegetable oil obtained from the seeds of a plant similar to safflower, Vernonia galamensis, but it is expected that the future price reduction and stable supply will be possible due to the increase in cultivation in the United States. It is considered.

[0009]

The resin component used in the present invention is highly reactive because the vernonia oil blended in the phenol resin has an epoxy group, so it has excellent curability, and the resulting laminate has punching workability and electrical characteristics. And good mechanical properties,
It is considered that the water resistance is good due to the hydrophobicity of the vernonia oil itself. Vernonia oil is 2.5 to 5 parts by weight with respect to 100 parts by weight of the phenol resin (solid content) used.
0 parts by weight, more preferably 5 to 20 parts by weight is suitable. When it is less than 2.5 parts by weight, the effect of improving the curability cannot be sufficiently obtained, and when it is more than 50 parts by weight, the adhesiveness becomes insufficient and delamination occurs during punching. The phenol resin used in the present invention is a phenol resin modified with a drying oil such as tung oil, an alkyl modified phenol resin or an unmodified phenol resin, and is not particularly limited.

[0010]

【Example】

(Synthesis Example 1) A mixture of 1200 g of phenol, 800 g of tung oil and 5 g of paratoluenesulfonic acid was reacted at 80 ° C for 3 hours. Next, 800 g of toluene and 20 g of triethanolamine were added to this to dilute and neutralize, then 500 g of paraformaldehyde, 30 g of 25% aqueous ammonia.
Was added, and the mixture was reacted at about 100 ° C. for 4 hours, then dehydrated and detoluene removed under reduced pressure. Toluene (1000 g) and methanol (1000 g) were added to the obtained resin to dilute it to obtain a tung oil-modified phenol-formaldehyde resin (Resin 1) varnish having a resin content of 50% by weight. (Synthesis example 2) 1000 g of phenol, 980 g of 37% formalin and 20 g of triethylamine were mixed and reacted at 60 ° C. for 2 hours, then concentrated under reduced pressure, and diluted with a mixed solvent of methanol / water = 80/20. Resin content 50
A water-soluble low molecular weight phenol-formaldehyde resin (resin 2) varnish was obtained in a weight percentage.

EXAMPLE A kraft paper was primed with Resin 2 obtained in Synthesis Example 2. 10 parts by weight of vernonia oil was added to 100 parts by weight of resin 1 (solid content) obtained in Synthesis Example 1 and mixed, and the obtained resin varnish was impregnated into the kraft paper and dried to obtain a resin content of 56% containing vernonia oil. I got a prepreg of. 8 sheets of this prepreg are laminated, and one side has a thickness of 35
Layered with copper foil of μm, 6 at 160 ℃, 80kg / cm ²
It was heated and pressed for 0 minutes to obtain a phenol resin laminate having a thickness of 1.6 mm. (Comparative Example) A phenol resin laminated plate was obtained in the same manner as in the above-mentioned example except that no Vernonia oil was added.

Table 1 shows the results of Examples and Comparative Examples.

[Table 1]

[0013]

EFFECT OF THE INVENTION The phenolic resin laminate obtained by the production method of the present invention has excellent curability, punching workability, water resistance, electrical properties and mechanical properties, and is suitable for printed wiring boards and electrical insulation. It can be suitably used for plates and the like.

Claims (1)

[Claims] 1. A laminate base material is impregnated with a resin component containing 2.5 to 50 parts by weight of a vernonia oil represented by the following chemical formula (I) or a derivative thereof based on 100 parts by weight of a phenol resin, followed by drying. A method for producing a phenolic resin laminate, which comprises molding. [Chemical 1]