JP2001220514A - Resin composition for electric part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition which, as an insulation material for electronic parts, can realize low permittivity and low dielectric tangent at a low cost. SOLUTION: This composition is prepared by compounding 100 pts.wt. thermoplastic or thermosetting resin with 5-200 pts.wt. calcium carbonate having a purity of 99.5% or higher.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for electronic parts having excellent dielectric properties used for insulating members of various electronic devices.

[0002]

2. Description of the Related Art In recent years, the frequency of semiconductor devices mounted on electronic devices has been increased, and in order to prevent power loss due to an increase in dielectric loss accompanying the increase in frequency, insulating resin for electronic components in a high frequency region has been required. There is a demand for low dielectric constant and low dielectric loss tangent as well as heat resistance, mechanical properties and dimensional stability.
Attempts have been made to add various fillers to improve this dielectric property. For example, Japanese Patent Application Laid-Open No. 6-846.
In Japanese Patent Publication No. 42, spherical silica hollow beads are disclosed in JP-A-7-3.
Japanese Patent No. 20538 discloses boron nitride, diamond, and beryllium oxide; Japanese Patent Application Laid-Open No. 8-20671 discloses whiskers of a composite oxide of boron oxide and another metal oxide; and Japanese Patent Application Laid-Open No. 11-150344 discloses tetrafluoroethylene. Fibers are each used.

[0003] However, these fillers are expensive to use as industrial raw materials, and the resin compositions containing them have to be expensive.

[0004] Calcium carbonate is widely used as an inexpensive filler. Calcium carbonate is generally used as a resin extender because it is inexpensive, but heat resistance, mechanical properties, and dimensional stability can be improved by adding it to the resin. If this calcium carbonate can be applied to electronic components that require strict dielectric properties, it is extremely useful for industrial use.

[0005] Types of calcium carbonate include heavy calcium carbonate prepared by pulverizing ore mined from the natural state by pulverization, and light calcium carbonate synthesized by blowing quicklime into an aqueous solution and blowing carbon dioxide gas. However, the resin composition obtained by blending either of these with the resin increases the dielectric constant and dielectric loss tangent, and is difficult to apply to electronic components such as circuit board materials that require low dielectric constant and low dielectric loss tangent. Met.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a resin composition which can realize low dielectric constant and low dielectric loss tangent at low cost as an insulating material for electronic parts.

[0007]

Means for Solving the Problems In view of such circumstances, the present inventors have conducted intensive studies and studies. As a result, the incorporation of high-purity calcium carbonate into the resin increases the dielectric constant of the resin composition. And found that the dielectric loss tangent can be reduced, thereby completing the present invention.

The calcium carbonate used in the practice of the present invention has a purity of 99.5% or more, preferably 99.7%.
%, More preferably 99.9% or more. As a method for producing high-purity calcium carbonate, in the case of light calcium carbonate, the purity can be increased by a washing method. Since heavy calcium carbonate is obtained by pulverizing a natural product, refining it to increase its purity is costly and difficult to put to practical use. At present, the purity of high-purity calcium carbonate for resins commonly distributed is 97% for heavy calcium carbonate and about 99% for light calcium carbonate, both of which are suitable for improving dielectric properties. is not.

The purity in the present invention means that calcium carbonate is dissolved in an acid, alkali metals, alkaline earth metals, transition metals, metals other than calcium, such as aluminum, are quantitatively determined. Are determined, the total is converted to the weight of the oxide, and the sum is defined as the total amount of impurities, and the ratio is subtracted from the total.

The particle size of the calcium carbonate is not particularly limited, and the surface of the calcium carbonate may be subjected to a surface treatment using an organic substance or a silane coupling agent. These treatment agents are not included in the purity of calcium carbonate. That is, the purity of calcium carbonate refers to the purity measured in a state where the surface treatment agent has been removed, even when the surface treatment is performed on the calcium carbonate.

The amount of calcium carbonate is adjusted within the range of 5 to 200 parts by weight based on 100 parts by weight of the resin. 5
If the amount is less than 10 parts by weight, the dielectric properties are not improved,
Properties such as dimensional stability and heat resistance are not satisfactory. If it exceeds 200 parts by weight, the melt viscosity when the resin composition is heated becomes too high, and a good molded product cannot be obtained.

The resin used in the practice of the present invention is not particularly limited. For example, polyphenylene ether resin, syndiotactic polystyrene, 5-
Methylpentene resin, cyclic polyolefin, heat-resistant AB
S resin, heat-resistant polyamide resin, polyphenylene sulfide resin, aromatic polysulfone resin, polyetherimide resin, polyetherketone resin, polyethernitrile resin, thermotropic liquid crystal polyester resin, heat-meltable fluororesin, etc. Thermoplastic resins represented by plastic resins, phenolic resins, epoxy resins, unsaturated polyester resins, and the like,
One or a mixture of two or more of these may be used.

The resin composition of the present invention may further contain other particulate additives, glass fibers, milled glass fibers, reinforcing fibers such as various whiskers, and the like, as long as the object thereof is not impaired.
Conventional additives such as an antioxidant, a heat stabilizer, an ultraviolet absorber, a colorant, a lubricity-imparting agent, a release improver, and an antistatic agent can be appropriately compounded.

In producing the resin composition of the present invention, generally known methods can be used. For example, in the case of a thermoplastic resin, a method in which calcium carbonate and the additives are previously mixed with the resin using a tumbler or a ribbon mixer and then melt-extruded, while the resin is melt-kneaded using a twin-screw extruder, Calcium carbonate,
There is a method of side-feeding the additive. In the case of a thermosetting resin, it is common that calcium carbonate, the additive and the uncured resin raw material are charged and mixed in a super mixer or a kneader, and then a curing agent is added and taken out in a paste form.

[0015] The resin composition thus obtained is improved in properties such as mechanical properties, dimensional stability and heat resistance by blending calcium carbonate, and has a low dielectric constant and a low dielectric loss tangent. It can be expected to be used for all electronic device parts that require a low dielectric constant, such as high-frequency circuit board materials.

[0016]

The dielectric constant of calcium carbonate is not particularly high as compared with resin, but the dielectric loss tangent is a sufficiently small value. However, the dielectric constant and the dielectric loss tangent of the resin composition filled with calcium carbonate were large values. This is due to the fact that the purity of calcium carbonate used as a resin filler is about 99% even at high purity. In other words, the main use was as an extender,
There has not been much research on the development of calcium carbonate having a purity of 99.5% or more, or on the electrical characteristics that can be exhibited by using high-purity products, and the findings obtained in the present invention are conventionally known. I didn't get it. The calcium carbonate used in the present invention has an impurity content of 0.5%
By suppressing the content below, the inherent properties of calcium carbonate when incorporated into the resin were developed, and the dielectric properties of the resin composition of the present invention could be dramatically improved.

[0017]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these examples. The raw materials and evaluation test methods used in the examples and comparative examples are as follows. [Calcium carbonate] Sample 1: "Brilliant-15" manufactured by Shiraishi Kogyo (center particle size 0.5
Sample 2: Precipitated calcium carbonate (in-house synthesized product, central particle size 1.2 μm, purity 99.55%) Sample 3: "CUBE-08" made by Maruo Calcium (central particle size: 0,1 μm, purity 99.1%)
Sample 4: “CS-C3N” manufactured by Ube Materials (central particle size: 3 μm, purity: 99.71%)
(Measuring method of center particle size) Calcium carbonate was dispersed in a 0.1% aqueous sodium hexametaphosphate solution and measured by a laser diffraction method. [Method for measuring purity] Calcium carbonate was held at 200 ° C. until weight loss was eliminated, and the weight at this point was reduced to 100%.
And After dissolving calcium carbonate in 1N hydrochloric acid, IC
The metal ion of 10 ppm or more was quantified by the P method. Similarly, after the sample was dissolved in 1N sodium hydroxide, silicon was quantified by the ICP method. The detected metal and silicon were each converted to the weight of the oxide, and the purity (%) was obtained by subtracting the ratio (%) of the total weight to the whole (100) from 100%. In the case of calcium carbonate subjected to surface treatment, the purity was measured after removing the surface treatment agent with a solvent or the like. [Dielectric constant and dielectric loss tangent] Measured according to JIS K-6911.

[Examples 1 to 3, Comparative Examples 1 and 2] Polyphenylene ether resin ("Zylon PXL" manufactured by Asahi Kasei Corporation)
-2502 "), 100 parts by weight, calcium carbonate and the amount shown in Table 1 were mixed and pelletized using a single screw extruder. Test pieces were prepared by injection molding of the obtained pellets, and their dielectric properties were measured. The test results obtained were as shown in Table 1.

[0019]

[Table 1]

The polyphenylene ether resin is a resin having a small dielectric constant and a small dielectric loss tangent. From Table 1, it can be seen that the dielectric constant and the dielectric loss tangent of calcium carbonate (sample 1), which is a normal high-purity product, are both large, while those of samples 2 to 4 are kept small.

Examples 4 to 6 and Comparative Examples 3 and 4 Instead of the polyphenylene ether resin, a polyetherimide resin ("Ultem # 101" manufactured by Nippon GE Plastics) was used.
The test was performed in the same manner as in Examples 1 to 3 and Comparative Examples 1 and 2, except that 0-1000 ") was used. Table 2 shows the obtained results.

[0022]

[Table 2]

From Table 2, it can be seen that the dielectric constant and the dielectric loss tangent of sample 1 are both large, while samples 2 to 4 are kept small.

Examples 7 to 9 and Comparative Examples 5 and 6 Instead of the polyphenylene ether resin, a thermotropic liquid crystal polyester (Vectra C95 made by Polyplastics) was used.
0 "), except that the test was conducted in the same manner as in Examples 1 to 3 and Comparative Examples 1 and 2. Table 3 shows the obtained results.

[0025]

[Table 3]

As shown in Table 3, while the dielectric constant and the dielectric loss tangent of Sample 1 are both large, the dielectric constants of Samples 2 to 4 are kept small and the dielectric loss tangent is rather small.

[Examples 10 to 12, Comparative Examples 7 and 8] Phenol type epoxy resin ("EP" manufactured by Dainippon Ink and Chemicals, Inc.)
CLON 850 ”), 100 parts by weight of metaxylindiamine as an epoxy resin curing agent, and 100 parts by weight of calcium carbonate shown in Table 4 were stirred and kneaded with a planetary mixer to obtain an epoxy resin composition. These resin compositions were cured, and a test piece was cut out from the obtained cured sheet to measure the dielectric properties. The test results obtained were as shown in Table 4.

[0028]

[Table 4]

From Table 4, it can be seen that the dielectric constant and the dielectric loss tangent of Sample 1 are both large, while the dielectric constants of Samples 2 to 4 are kept small and the dielectric loss tangent is greatly reduced.

[0030]

The resin composition for electronic parts of the present invention has improved mechanical properties, dimensional stability and heat resistance by adding high purity calcium carbonate to the resin,
Since it is low in cost and has excellent dielectric properties, it is suitable as a resin for electrical insulation, and can be widely applied to electronic equipment parts requiring a low dielectric constant such as circuit boards.

Claims (1)

[Claims] 1. A thermoplastic or thermosetting resin 100
A resin composition for an electronic component, comprising 5 to 200 parts by weight of calcium carbonate having a purity of 99.5% or more based on parts by weight.