JPH0541333A - 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 an aromatic polybasic acid alkenyl ester compound monomer, which is shown by the formula [R1 and R2 are an alkenyl group of 3 to 8c, which may be identical to each other or different from each other, R3 and R4 are hydrogen atoms, an alkyl group of 1 to 8c, an alkoxy group of 1 to 5c or a -(CO)-O-R group, the R in the -(CO)-O-R group is an alkenyl group of 3 to 8c and the R' in a -R'-C3N group is an alkylene group of 2 to 5c] as a dielectric for capacitor use, is used as the dielectric. In the case the compound monomer is synthesized, it can be obtained by a method wherein an aromatic polybasic acid is made to react with alcohol under an acid catalyst and is esterfied.

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 and R ₂ may be the same or different and are alkenyl groups having 3 to 8 carbon atoms; R ₃ and R ₄ are hydrogen atoms, alkyl groups having 1 to 8 carbon atoms, and 1 to 1 carbon atoms. An alkoxy group of 5 or a-(CO) -OR group,
R in the (CO) -O-R group represents an alkenyl group having 3 to 8 carbon atoms, an -R'-C≡N group, an alkyl group having 1 to 8 carbon atoms, and in the -R'-C≡N group. R'has 2 carbon atoms
Which represents an alkylene group of 5 to 5), and a capacitor having an organic polymer as a dielectric, characterized by using a three-dimensional structural addition polymer obtained from an aromatic polybasic acid alkenyl ester compound monomer as a dielectric. Provided.

In synthesizing the alkenyl ester compound of aromatic polybasic acid, a desired monomer is obtained by reacting an aromatic polybasic acid (or acid anhydride) with an alcohol in the presence of an acid catalyst to directly esterify the compound. be able to.

Alternatively, the desired monomer can be obtained by reacting an alkenyl chloride with an aromatic polybasic acid metal salt.

Specific examples of unsaturated alcohols used in the synthesis include allyl alcohol, crotyl alcohol, 3-buten-1-ol, 2-methyl-2-buten-1-ol, 3-methyl-3-butene-1. -Ol, 1-penten-3-ol, 2-penten-1-ol, cis-
2-Penten-1-ol, 3-penten-2-ol, 4-penten-1-ol, 4-penten-2-ol and the like can be exemplified.

When alkenyl chloride is used, specific examples of alkenyl chloride include allyl chloride, crotyl chloride, 3-chloro-1-butene and 1-chloro-2.
-Methylpropene, 3-chloro-2-methylpropene,
1-chloro-3-methyl-2-butene etc. can be illustrated.

Specific examples of the aromatic polybasic acid include phthalic acid, isophthalic acid, terephthalic acid, pyromellitic acid, trimellitic acid, hemimellitic acid, trimesic acid, methylisophthalic acid, prenitic acid, melophanoic acid, benzenepentacarboxylic acid and melitto. Examples thereof include acids and methoxyphthalic acid.

In producing the capacitor, the aromatic polybasic acid alkenyl ester compound monomer is evaporated at a heating temperature capable of evaporating at a vacuum chamber pressure of 1 × 10 ^-4 torr or less, and then cured by an electron beam to obtain a dielectric. To form. 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.

[0016]

The addition polymer obtained from the aromatic polybasic acid alkenyl ester compound monomer disclosed by the present invention has excellent thermal stability due to the formation of a three-dimensional structure, and when used as a dielectric of a capacitor, has a wide temperature range. Gives a dielectric showing stable performance characteristics such as capacitance, dielectric loss tangent, and leakage current.

[0017]

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.

[0018]

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 Diallyl terephthalate 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 of the present invention was used as a dielectric. I made a capacitor.

In producing the capacitor, the diallyl terephthalate monomer was evaporated at a heating temperature capable of evaporating 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 50. Table 1 shows the product life characteristics of the obtained capacitors.

Example 2 Triallyl trimellitate (4
0% by weight) and diallyl phthalate (60% by weight), a dielectric thickness of 1 to 1.5 μm, an electrode (aluminum) formation area of 25 mm ² , and a capacitor using the organic polymer according to the present invention as a dielectric. It was created.

When the condenser is produced, the monomers of triallyl trimellitate (40% by weight) and diallyl phthalate (60% by weight) are evaporated at a heating temperature capable of evaporating at a vacuum chamber pressure of 1 × 10 ⁻⁴ torr or less. After that, it was 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 3 Diallyldi-2 pyromellitic acid as a dielectric-forming monomer
-Using cyanoethyl, the dielectric thickness is 1 ~ 1.5μ
m, the electrode (aluminum) formation area was 25 mm ² , and a capacitor using the organic polymer according to the present invention as a dielectric was prepared.

When a capacitor is produced, the diallyl di-2-cyanoethyl pyromellitic acid monomer is evaporated at a heating temperature capable of evaporating under a vacuum chamber pressure of 1 × 10 ^-4 torr or less, and then cured by an electron beam to form a dielectric. Formed. 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 4 Dicrotyl isophthalate was used as a dielectric-forming monomer, the dielectric thickness was 0.5 to 1 μm, the electrode (aluminum) forming area was 25 mm ² , and the organic polymer according to the present invention was used as a dielectric. I made a capacitor.

In producing the capacitor, the dicrotyl isophthalate monomer was evaporated at a heating temperature capable of evaporating 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 50. Table 1 shows the product life characteristics of the obtained capacitors.

[0027]

[Table 1]

From the above results, by using an addition polymer obtained from an aromatic polybasic acid alkenyl ester compound monomer, which is a unique organic polymer, as a dielectric material for a capacitor, it is possible to obtain excellent static electricity especially in an operating environment at high temperature. SM, which exhibits performance characteristics such as capacitance, dielectric loss tangent, leakage current, etc.
It can be seen that a capacitor using an organic polymer as a dielectric, which can meet the expectations for a T-compatible high heat resistant capacitor, is provided.

 ─────────────────────────────────────────────────── ─── 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 _(Wherein, R 1, _{R 2,} the same or different and an alkenyl group having a carbon number of 3 to _8, R 3, _{R 4} is a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, alkoxy having 1 to 5 carbon atoms Group, or a-(CO) -OR group, wherein-(CO) -O-
R in the R group is alkenyl group having 3 to 8 carbon atoms, -R '
-C≡N group, an alkyl group having 1 to 8 carbon atoms, and-
R'in the R'-C≡N group represents an alkylene group having 2 to 5 carbon atoms) A three-dimensional structural addition polymer obtained from an aromatic polybasic acid alkenyl ester compound monomer is used as a dielectric. Capacitor.