JPH0541330A - Capacitor - Google Patents

Abstract

PURPOSE:To contrive to make the superior performance characteristics of a capacitor fulfill in a high-temperature working atmosphere specially by a method wherein a specified organic polymer is used as a dielectric for capacitor use. CONSTITUTION:A capacitor is constituted of a dielectric consisting of an organic polymer and a three-dimensional structure addition polymer obtainable from a 1,3,5-triazine compound monomer, which is shown by the formula [R1, R2 and R3 are an alkenyl group of 3 to 8C, an alkyl group of 1 to 8C or 2- cyanoethyl group and at least one of the R1, R2 and R3 is the alkenyl group] as a dielectric for capacitor use, is used as the dielectric. In the case the compound monomer is synthesized, it can be obtained by making cyanuric chloride react with alcohol under the existence of sodium hydroxide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor using an organic polymer as a dielectric, and more particularly to a novel organic polymer as a dielectric for a capacitor. The present invention relates to a capacitor composed of a dielectric made of an improved specific organic polymer.

[0002]

2. Description of the Related Art A capacitor is generally used as a circuit element and basically has a structure in which two conductor plates are opposed to each other with air or another dielectric interposed, but various forms are used depending on the type of dielectric and the purpose of use. There is one. In particular, with the recent miniaturization and high density of electric and electronic devices, smaller capacitors with high capacitance per volume and large volume efficiency are becoming increasingly important, especially in high-temperature operating environments. There is great expectation for a good SMT-compatible high heat resistance capacitor.

This type of capacitor is generally in the form of a polymer-integrated capacitor, in which a thin polymer coating film is formed on various substrates and used as a dielectric. This polymer coating film is formed mainly by performing vapor deposition in a vacuum chamber. As prior art relating to such a capacitor and coating technology, for example, JP-A-60-153113, JP-A-62-289259, JP-A-63-72107,
JP-A-63-72108, JP-A-63-503552
JP-A-1-316450, JP-A-2-43042
No. etc. can be illustrated.

The characteristics of capacitors are mainly capacitance,
The dielectric loss tangent and the leakage current can be evaluated as indexes. In the case of a capacitor that requires good operation in a high temperature environment, such evaluation can be performed as a product life characteristic test in a high temperature environment. Generally, the capacitance of a capacitor is proportional to the dielectric constant of the dielectric, so that a dielectric having a high dielectric constant should be used, and the physicochemical change of the dielectric should be avoided during use to keep the dielectric constant high. The tangent of the loss angle, which is the difference between the phase of the charging current and the phase of the external electric field, or the dielectric loss tangent, is used as a measure of the power consumption of the capacitor.
A small value indicates low power consumption. The leakage current, which is the current that flows when a certain value is reached after the start of charging, is due to the steady movement of the charge carriers in the dielectric, and if the ions generated by dissociation of impurities in the dielectric are the main charge carriers. It is believed that the magnitude of the change in leakage current reflects the stability of the electrochemical state of the dielectric.

A conventional capacitor using an organic polymer as a dielectric is not always sufficient in performance characteristics such as capacitance, dielectric loss tangent, leakage current, etc. particularly in an operating environment at high temperature, and further, an expectation for an SMT-compatible high heat resistant capacitor It wasn't possible to answer completely.

[0006]

SUMMARY OF THE INVENTION The present invention uses a unique organic polymer as a dielectric material for a capacitor, and thus has excellent performance characteristics such as capacitance, dielectric loss tangent, leakage current, etc., especially in a high temperature operating environment. It is an object of the present invention to provide a capacitor having an organic polymer as a dielectric, which exhibits the above-mentioned characteristics and can meet the expectation for an SMT-compatible high heat-resistant capacitor.

[0007]

According to the present invention, there is provided a capacitor composed of a dielectric made of an organic polymer, which has the following general formula:

[0008]

[Chemical 2]

(In the formula, R ₁ , R ₂ and R ₃ have 3 to 8 carbon atoms.
Alkenyl group, C1-8 alkyl group or 2-
A cyanoethyl group, at least one of which is an alkenyl group), and a three-dimensional structure addition polymer obtained from a 1,3,5-triazine compound monomer represented by A polymer dielectric capacitor is provided.

When synthesizing the 1,3,5-triazine compound monomer, the following reaction formula:

[0011]

[Chemical 3]

As represented by, the desired monomer can be obtained by reacting cyanuric chloride with an alcohol in the presence of sodium hydroxide.

Specific examples of alcohols used in the synthesis include:
Allyl alcohol, crotyl alcohol, 3-butene-
1-ol, 2-methyl-2-buten-1-ol, 3
-Methyl-3-buten-1-ol, 1-pentene-3
-Ol, 2-penten-1-ol, cis-2-penten-1-ol, 3-penten-2-ol, 4-
Examples thereof include unsaturated alcohols such as penten-1-ol and 4-penten-2-ol, saturated alcohols such as methanol, ethanol, propyl alcohol, butyl alcohol and pentyl alcohol, ethylene cyanohydrin and the like.

When manufacturing a capacitor, the pressure in the vacuum chamber is 1 × 10 ⁻⁴ torr or less, and 1, 3, 5
-Evaporation of the triazine-based compound monomer at a heating temperature at which evaporation is possible, followed by curing with an electron beam to form a dielectric. A capacitor can be made by alternately forming this dielectric and the vapor-deposited metal layer. Such a vapor deposition forming method may be based on a conventionally used ordinary technique, and may be based on, for example, the technique described in the above-mentioned prior art document.

[0015]

The addition polymer obtained from the 1,3,5-triazine compound monomer disclosed by the present invention has excellent thermal stability due to the formation of a three-dimensional structure, and has stable capacitance, dielectric loss tangent, and stable temperature range over a wide temperature range. A dielectric showing performance characteristics such as leakage current is obtained.

[0016]

According to the present invention, by using a unique organic polymer as a capacitor dielectric, excellent performance characteristics such as capacitance, dielectric loss tangent, leakage current, etc. are exhibited especially in a high temperature operating environment. However, there is provided a capacitor using an organic polymer as a dielectric, which can meet the expectations for an SMT-compatible high heat-resistant capacitor.

[0017]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.

Example 1 Triallyl cyanurate was used as a dielectric-forming monomer, the dielectric thickness was 0.5 to 1 μm, and the electrode (aluminum) formation area was 25 mm ^{2. The} organic polymer according to the present invention was used as a dielectric. A capacitor was created.

In producing the capacitor, the triallyl cyanurate monomer was evaporated at a heating temperature at which evaporation was possible under a vacuum chamber pressure of 1 × 10 ^-4 torr or less, and then cured by an electron beam to form a dielectric. A capacitor was prepared by alternately forming the dielectric and the vapor-deposited metal layer. The number of laminated dielectrics was 50. Table 1 shows the product life characteristics of the obtained capacitors.

Example 2 Tricrotyl cyanurate was used as a dielectric-forming monomer, the dielectric thickness was 0.5 to 1 μm, and the electrode (aluminum) forming area was 25 mm ² , and the organic polymer according to the present invention was used as a dielectric. A capacitor was created.

In producing the capacitor, the triclotyl cyanurate monomer was evaporated at a heating temperature at which evaporation was possible at a vacuum chamber pressure of 1 × 10 ^-4 torr or less, and then cured by an electron beam to form a dielectric. A capacitor was prepared by alternately forming the dielectric and the vapor-deposited metal layer. The number of laminated dielectrics was 30. Table 1 shows the product life characteristics of the obtained capacitors.

Example 3 Triallyl cyanurate (4
0% by weight) and diallyl-2-cyanoethyl cyanurate (60% by weight) and a dielectric thickness of 1 to 1.5
A capacitor using the organic polymer according to the present invention as a dielectric was prepared with a thickness of μm and an electrode (aluminum) formation area of 25 mm ² .

When producing a capacitor, the pressure in the vacuum chamber is 1 × 10 ^-4 torr or less, and triallyl cyanurate monomer (40% by weight) and diallyl-
2-Cyanoethyl cyanurate monomer (60% by weight)
Was evaporated at an evaporable heating temperature and then cured by an electron beam to form a dielectric. A capacitor was prepared by alternately forming the dielectric and the vapor-deposited metal layer. The number of laminated dielectrics was 30. Table 1 shows the product life characteristics of the obtained capacitors.

[0024]

[Table 1]

From the above results, the use of a three-dimensional structure addition polymer obtained from a 1,3,5-triazine compound monomer, which is a unique organic polymer, as a dielectric for a capacitor makes it possible to obtain an operating environment especially at high temperature. S has excellent performance characteristics such as capacitance, dielectric loss tangent, leakage current, etc.
It can be seen that there is provided a capacitor having an organic polymer as a dielectric, which can meet the expectations for MT-compatible high heat resistant capacitors.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Yokoyama 1-167-1, Higashi-Ome, Ome-shi, Tokyo Inside Nippon Chemi-Con Corporation

Claims (1)

[Claims] 1. A capacitor composed of a dielectric made of an organic polymer, the dielectric for a capacitor comprising:
The following general formula (In the formula, R ₁ , R ₂ and R ₃ are an alkenyl group having 3 to 8 carbon atoms, an alkyl group having 1 to 8 carbon atoms or a 2-cyanoethyl group, at least one of which is an alkenyl group) A capacitor comprising a three-dimensional structure addition polymer obtained from the represented 1,3,5-triazine compound monomer as a dielectric.