JPH05318665A - Polyphenylene sulfide laminated film and cadacitor using the same - Google Patents

Abstract

PURPOSE:To achieve the reduction of low voltage breakdown frequency and the enhancement of self-healing properties and humidity resistance by setting the sum thickness of surface layers each composed of a polyester film to a specific % range with respect to the thickness of a center layer made of a biaxially oriented film made of poly-p-phenylene sulfide represented by a specific structural formula. CONSTITUTION:A polyphenylene sulfide laminated film is obtained by laminating surface layers (A-layers) each composed of a polyester film on both surfaces of a center layer (B-layer) composed of a biaxially oriented film of poly-p- phenylene sulfide wherein 70mol% or more of a repeating unit is represented by formula I. The sum thickness of the A-layers is set to 30-50% of the thickness of the B-layer and the intrinsic viscosity of polyester is set to 0.62 or more. This polyphenylene sulfide laminated film is reduced in low voltage breakdown frequency and improved in self-healing properties and humidity resistance at the time of the application of voltage and a condenser constant in capacity over a side temp. range and enhanced in reliability can be produced using said film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyphenylene sulfide laminated film and a capacitor using the same.

[0002]

2. Description of the Related Art Biaxially stretched polyphenylene sulfide film is disclosed in JP-A-54-142275. Further, JP-A-57-187327 proposes to obtain a capacitor having excellent heat resistance, frequency characteristics, temperature characteristics, etc. by using a biaxially stretched polyphenylene sulfide film as a capacitor dielectric. .. Further, JP-A-62-255142 proposes a composite film in which a biaxially oriented polyester film is laminated with a biaxially oriented polyphenylene sulfide film.

However, the conventional aluminum vapor-deposited film capacitor using polyphenylene sulfide has a narrow manufacturing condition range in the manufacturing process, that is, winding, cutting, molding, etc., and if the management of these is insufficient, low voltage breakdown may occur. There was a drawback that the number of defective products increased. Furthermore, since the conventional polyphenylene sulfide film is inferior in self-healing property (self-healing property) when a local voltage breakdown occurs, when a low voltage breakdown occurs, a short circuit often occurs without self-healing. There are drawbacks such as increasing the defective rate, increasing the number of defective products during voltage processing, and low reliability during use.

Further, the conventional capacitor as described above is
It has a drawback that the moisture resistance life is short, that is, the electrode disappears promptly in a high-temperature and high-humidity environment, resulting in a decrease in capacitance and a large increase in dielectric loss. Further, the above-mentioned composite film has drawbacks that peeling easily occurs between layers, many defective products are caused by low voltage breakdown, and variation in electrostatic capacitance is large.

In order to solve such a drawback of the polyphenylene sulfide film, Japanese Patent Laid-Open No. 3-71213 discloses a polyphenylene sulfide film having polyethylene terephthalate laminated on the surface thereof, but in the state where a voltage is applied. It had the drawback of having a short moisture resistance life.

[0006]

The object of the present invention is to solve the above-mentioned drawbacks of the conventional polyphenylene sulfide film, reduce the frequency of low voltage breakdown, improve self-healing property and moisture resistance, and to cover a wider temperature range. It is an object of the present invention to provide a capacitor having a constant capacity and improved reliability, and a polyphenylene sulfide laminated film from which such a capacitor can be easily manufactured.

[0007]

To achieve this object, the polyphenylene sulfide laminated film of the present invention comprises a biaxially oriented poly-p-phenylene sulfide in which 70 mol% or more of repeating units are represented by the structural formula 2. A laminated film in which a surface layer (A layer) made of a polyester film is laminated on both sides of a central layer (B layer) made of a film, and the total thickness of the A layer is 3% or more of the thickness of the B layer 50.
% Or less and the intrinsic viscosity of the polyester is 0.62
It consists of the above.

[Chemical 2]

The capacitor of the present invention can be obtained by winding or laminating a metallized polyphenylene sulfide laminated film having aluminum deposited on at least one surface layer of this polyphenylene sulfide laminated film.

In the present invention, the surface layer (A layer) means a biaxially oriented poly-p-phenylene sulfide film (hereinafter,
The surface of the central layer (B layer) composed of a biaxially oriented PPS film is formed, and the surface of the polyphenylene sulfide laminated film of the present invention (hereinafter sometimes abbreviated as PPS laminated film) is formed. It is a thing. Polyester is used as the film constituting the surface layer. Polyester is not particularly limited, but is usually polyethylene terephthalate, polyethylene α, β
-Bis (2-chlorophenoxy) ethane 4,4'-dicarboxylate, polyethylene 2,6-naphthalate,
Polybutylene terephthalate or the like is used. Among them, polyethylene terephthalate is preferable.

In the present invention, the intrinsic viscosity of the above polyester needs to be 0.62 or more. Preferably 0.65 to 1.5, more preferably 0.7 to 1.
It is 4. When the intrinsic viscosity of the polyester is less than 0.62, the moisture resistance when used as a capacitor becomes insufficient, which is not preferable. The intrinsic viscosity of the polyester part is measured by peeling, but if peeling is difficult, 180-2
This treatment can be carried out because peeling is facilitated by performing heat treatment again at 40 ° C. for about 10 to 60 seconds. Further, using a solvent that dissolves the polyester but not the poly-p-phenylene sulfide (hereinafter sometimes abbreviated as PPS), for example, phenol-tetrachloroethane (50/50 weight ratio), only the polyester portion is used. It can be dissolved and measured.

In order to control the intrinsic viscosity of polyester in the PPS laminated film of the present invention to 0.62 or more,
It is necessary to use at least a polyester having an intrinsic viscosity of 0.62 or more in the extrusion described below. This polyester may be one having a high intrinsic viscosity obtained by ordinary melt polymerization, but it may be further solidified after the melt polymerization. Those obtained by phase polymerization to have a high intrinsic viscosity are preferably used.

In the present invention, the central layer means a layer made of a biaxially oriented PPS film, which is substantially at the center in the thickness direction of the film of the present invention. In the present invention, biaxially oriented PPS
The film is a film obtained by melt-extruding, biaxially stretching, and heat-setting a poly-p-phenylene sulfide composition (hereinafter, may be abbreviated as PPS composition). The thickness is preferably 0.5 to 12 μm.

Here, the PPS composition means 70 parts of PPS.
A resin composition containing at least 50% by weight, preferably at least 85% by weight, and less than 30% by weight, preferably 15% by weight
If it is less than the above, organic and inorganic additives, inert particles and the like may be contained.

Further, PPS here requires that 70 mol% or more (preferably 85 mol% or more) of the repeating units consist of p-phenylene sulfide units represented by Structural Formula 3.

[0015]

[Chemical 3]

When the content of the above components is less than 70 mol%, the crystallinity of the polymer, the heat transition temperature, etc. are lowered, and the heat resistance, dimensional stability and mechanical properties which are the features of the biaxially oriented PPS film are impaired, which is not preferable. If it is less than 30 mol% (preferably less than 15 mol%) of the repeating unit, it is composed of repeating units copolymerizable with the p-phenylene sulfide unit, for example, repeating units of the structural formulas shown in Chemical formulas 4 and 5 be able to.

[0017]

[Chemical 4]

[0018]

[Chemical 5]

The melt viscosity of the PPS composition of the present invention is 10 at a temperature of 300 ° C. and a shear rate of 200 sec ⁻¹ .
It is in the range of 0 to 50,000 poise, preferably 500.
˜12000 poise range.

The PPS laminated film of the present invention comprises the above biaxially oriented PPS film forming the central layer and the polyester film forming the surface layer laminated thereon. As a method for laminating, a method by coextrusion is preferable because the surface layer is extremely thin. In lamination by coextrusion, the polyester forming the surface layer and the PPS composition forming the center layer are combined and laminated in a polymer channel between the melt extrusion device and the die, but upstream of the die outlet (for example, a manifold). It is preferable that the layers are combined and laminated with each other. That is, the PPS composition and the polyester composition, which are supplied to separate melt extruders and are heated to a temperature higher than the melting point of each composition and melted, are melted by a confluence device provided between the extruder and the outlet of the die. It is laminated in three layers and extruded from the slit-shaped mouthpiece outlet. The molten laminate is placed on a rotary cooling drum
Cooling to below the glass transition temperature of the PS composition yields a laminated sheet in a substantially amorphous state. A known apparatus can be applied to the melt extrusion apparatus, but an extruder is preferable because it is simple.

Then, the amorphous laminated sheet is treated with PP.
The biaxially oriented PPS laminated film of the present invention is obtained by biaxially stretching the S composition at a temperature not lower than the glass transition temperature, at least biaxially orienting the central layer, and further heat treating. The method for producing such a PPS laminated film may be substantially the same as the method for producing a monolayer biaxially oriented PPS film except for the melt extrusion step, and the production method disclosed in JP-B-59-5099 can be applied. That is, it is stretched 2.0 to 5.0 times in the longitudinal direction in the range of 80 to 120 ° C., and then 80 to 12
A biaxially oriented film is obtained by stretching in the width direction of 2.0 to 5.0 times in the range of 0 ° C. Next, the biaxially oriented film is heat-treated under a constant length at 180 ° C. or higher to the melting point of the PPS composition or lower. If necessary, the shrinkage (relaxation) of the PPS composition may be limited to 0 to 20% vertically and horizontally at a temperature equal to or lower than the melting point of the PPS composition.

The PPS of the present invention obtained as described above
In the laminated film, the total thickness of the surface layers needs to be 3% or more and 50% or less of the thickness of the central layer. It is preferably 5 to 40%, more preferably 10 to 30%. When it is less than 3%, the self-recovery property of a capacitor is poor, which is not preferable. On the other hand, if it exceeds 50%, the dielectric loss at high temperature becomes large, which is not preferable.

In the present invention, the peak temperature Tmeta due to quasi-crystal melting which appears within the temperature range from the glass transition temperature to the melting point of the laminated film measured by a differential scanning calorimeter (DSC) is (Tm-15) ° C. (Tm: (Melting point of polyester) or higher, more preferably T
It is m-10 ° C or higher.

Further, the surface roughness Ra of the surface layer of the PPS laminated film is preferably 0.005 μm or more and 0.10 μm or less, and more preferably from the viewpoint of workability of the film and moldability of the capacitor element. 0.0
It is 1 μm or more and 0.07 μm or less. Further, it is preferable that the protrusion number linear density of the protrusions having a height of 50 nm or more is 10 pieces / mm or more because the handling property is improved, and the protrusion number linear density of the protrusions having a height of 200 nm or more is 5 pieces / mm or more. It is preferable that the thickness is less than or equal to mm because the withstand voltage of the capacitor having a relatively large capacity is improved.

Here, the projection number linear density means a stylus type surface roughness meter (cutoff value of 0.
08μm, tip radius of stylus 2μm, tip opening angle 90 degrees)
In the roughness curve chart measured with the vertical magnification N while moving the stylus at a speed of 0.1 mm / sec, the number of protrusions having the desired height is divided by the measurement length, and per unit length. It shows the number of protrusions. Here, the height of the protrusion means i on the measured roughness curve chart.
The height Pi of the i-th projection is defined as Pi = (Mi-Vi) / N, where the level Mi of the crest of the n-th projection and the level of the valley bottom on the left side of the i-th projection are Vi. However, the direction in which the stylus is moved is the width direction of the film.

The PPS laminated film of the present invention has a static friction coefficient of 0.4 to 1.5 and a dynamic friction coefficient of 0.3 to 0.8.
Is preferable from the viewpoints of processability such as slitting and vapor deposition and winding property of the capacitor element.

As a method for forming a surface so as to give the above-mentioned characteristics to the surface layer, there may be mentioned: a method of adding inert particles to the polyester composition for forming the surface layer; A method of using, a method of combining with and the like are preferably used.

In the present invention, it is preferable that the PPS composition contains substantially no inactive particles in order to reduce the frequency of dielectric breakdown when used as a capacitor.

Inert particles in the present invention are particles added mainly for controlling the surface,
Inorganic fillers such as silica, alumina, calcium carbonate, barium sulfate, magnesium oxide, zinc oxide, and titanium oxide, and particles of an organic polymer that does not melt at 350 ° C. (for example, a cross-linked polystyrene system obtained by copolymerization of styrene monomer and divinylbenzene) Particles: JP-A-61-1
No. 181837 gazette), and a small amount of particles precipitated during polymerization may be contained. As the shape of the inert particles, silica, crosslinked polystyrene-based particles, true spherical particles such as calcium carbonate are preferable. The particle size distribution is preferably uniform.
As a method of adding these inert particles, either a method of adding during the polymerization of the polyester composition and the PPS composition or a method of melting or melt-kneading after the polymerization can be adopted.

As a method of achieving a preferable surface morphology, a method of adjusting the relationship between the amount of the inert particles added to the polyester composition, the average particle size, and the thickness of the surface layer as follows is mentioned. Be done. That is, when the average particle diameter of the inactive particles is D (μm), the thickness of the surface layer is t (μm), and the content c of the inactive particles of the polyester composition is c (wt%), these values are It is preferable that the relationship of the expression (1) is satisfied. 0.1 ≦ c · t / D ≦ 5 (1) More preferably, 0.1 ≦ c · t / D ≦ 2 (2).

The film of the present invention is effective when used as a capacitor. The method for producing a capacitor using the film of the present invention will be described below, but it goes without saying that the method is not limited to these methods.

When a metal foil is used as the internal electrode of the capacitor, the metal foil and the above PPS laminated film are alternately superposed and wound by a foil extrusion winding method or a method of inserting a tab in the middle of winding. Then, the dielectric and the electrodes are alternately superposed and wound so as to have a structure in which the electrodes can be drawn out to obtain a capacitor element or a capacitor mother element.

When a metal thin film is used as the internal electrode of the capacitor, the PPS laminated film of the present invention described above is first metallized. The metallization method is preferably a method by vapor deposition. Further, the metal to be vapor-deposited is preferably a metal containing aluminum as a main component. When metallizing, the film surface on the metallizing side may be previously subjected to corona treatment, plasma treatment or the like to improve the adhesion between the metal thin film and the film. A tape mask to prevent short circuit of the counter electrode during or after metallization
It is a common method to provide a non-metallized portion (so-called margin) with an oil mask, a laser beam or the like, but it is also possible to provide a non-metallized zone by using discharge, a laser beam or the like after vapor deposition on the entire surface. After that, it may be slit into a narrow tape shape so that the margin portion is at one end.

Next, a capacitor element is manufactured. To obtain a wound-type capacitor, stack two metallized films that are slit into a narrow tape so that the margin is at one end, or stack a double-sided metallized film and a non-metallized film. The usual method is to wind each element individually. There is also a method of winding a single composite film having a second dielectric provided on a double-sided metallized film by a coating method or the like. In the case of a laminated capacitor, a large diameter drum or a flat plate is wound to obtain a capacitor mother element.

When a wound type capacitor is manufactured, the capacitor element obtained as described above is generally press-molded. At this time, heating at a temperature of 100 ° C. or higher and the melting point of the film or lower can be performed. After that, the external electrode attachment process (metal spraying, conductive resin, etc.), resin or oil impregnation process if necessary, lead wire attachment process when using a lead type capacitor, exterior process, to obtain the capacitor it can.

In the case of a laminated capacitor, a large-diameter drum or a mother element wound on a flat plate is heat-treated, clamped by a ring or the like, or pressed by a parallel flat plate or the like, and pressure is applied in the thickness direction of the film. To mold. The temperature range at that time is from room temperature to the melting point of the film or lower. After this, the external electrode mounting process (metal spraying, conductive resin, etc.), individual element cutting process, resin or oil impregnation process if necessary, lead wire mounting process when using a lead type capacitor, exterior process Capacitor can be obtained through.

Next, the capacitor of the present invention will be described. The capacitor of the present invention is a capacitor obtained by winding or laminating a metallized PPS laminated film obtained by vapor deposition of aluminum on the surface of the surface layer of the PPS laminated film of the present invention described above.

At least one of the surfaces on which aluminum is vapor-deposited is applied. Here, the thickness of the vapor deposited aluminum film is preferably 200 angstroms or more and 1000 angstroms or less from the viewpoint of electric characteristics of the capacitor and moisture resistance of the capacitor.

From the viewpoint of heat resistance and moisture resistance, the capacitor element or capacitor mother element of the present invention is preferably heat-treated in the presence of oxygen at a temperature of 180 ° C. or higher for 1 hour or longer.

[0039]

EXAMPLES The present invention will now be described in more detail by way of examples. The characteristics were evaluated as follows. (1) Intrinsic viscosity of polyester Phenol-tetrechlorethane (50/50 weight ratio)
Was measured.

(2) Tmeta Perkin-Elmer DSC-2 type differential scanning calorimeter, the temperature between the glass transition temperature and the melting point of the laminated film when heated from 20 ° C. under an inert gas atmosphere under the following conditions. The measured endothermic peak temperature was measured. Measurement conditions: Sample weight: 5 mg Temperature rising rate: 20 ° C / min

(3) Film thickness and lamination ratio of the whole and each layer: A transmission electron microscope image of the cross section of the laminated film was photographed,
It was calculated by calculating backward from the measurement magnification.

(4) Surface roughness Measured according to JIS-R-0601.

(5) Particle Size The polymer is removed from the film surface by a plasma low temperature ashing method to expose particles near the surface. At this time, select the condition that the particles are not damaged. This is observed with a scanning electron microscope (SEM), and the image of the particles is processed with an image analyzer. The following numerical processing is performed when the number of particles is changed to 5000 or more by changing the observation location, and the number average diameter D thus obtained is taken as the average particle diameter. D = ΣDi / N Here, Di is the equivalent circle diameter of particles, and N is the number of particles.

(6) Insufficient withstand voltage The film was slit into a width of 20 mm, and two films and two aluminum foils having a thickness of 15 μm were wound together to form a 0.
1000 pieces of 1 μF foil protruding type capacitors are prepared and the DC withstand voltage is measured. Applied voltage boost rate is 100
V / sec, 50 V / μm corresponding to the film thickness
The capacitor element destroyed by the following voltage was determined as a withstand voltage defective element, and the defective rate (%) was judged according to the following criteria. ⊚: defective rate less than 2% ○: defective rate 2% or more and less than 5% Δ: defective rate 5% or more and less than 10% x: defective rate 10% or more

(7) Variation in capacitance In the same manner as in (5) above, 1000 capacitor elements were prepared, pressed at 120 ° C. with a force of 15 kg / cm 2, and the capacitance was measured using an automatic capacitance bridge. ◎: Relative deviation is less than 2% ○: Relative deviation is 2% or more and less than 3% △: Relative deviation is 3% or more and less than 5% ×: Relative deviation is 5% or more Relative deviation = Standard deviation / Average value

(8) Self-healing test A parallel plate capacitor is formed by sandwiching two vapor deposition films, each of which has aluminum vapor-deposited with a thickness of 500 angstroms, on one side of a glass plate. At this time, the effective area for generating the capacitance is 100 cm ² . A voltage of 100 V / μm is applied between the electrodes while applying a load of 0.5 kg / cm ² to the capacitor from above, corresponding to the film thickness. Taking several samples, dielectric breakdown is generated at three points, and the state of self-healing (a phenomenon in which the vapor deposition film around the dielectric breakdown point scatters and the insulation is maintained) is evaluated. The criteria for judgment are as follows. ⊚: All three points self-healed sufficiently, and good insulation was maintained. ○: 2 points were self-healing enough and insulation was maintained,
One point was defective insulation or a short circuit. △: 1 point was self-healing enough and insulation was maintained,
Two points have poor insulation or are short-circuited. X: All three points were defective in insulation or short-circuited.

(9) Moisture resistance life test under voltage load A capacitor was applied with a voltage of 100 V in an atmosphere of 60 ° C. and 95% RH and aged for 1000 hours to measure the capacitance change rate. This was indicated by ΔC / C, and the moisture resistance life was judged. Where C is the capacitance before aging, ΔC
Is a value obtained by subtracting the capacitance before aging from the capacitance after aging. The judgment was based on the following criteria. The capacitance of the capacitor was measured using an automatic capacitance bridge. ⊚: ΔC / C ≧ 0 Very good voltage load moisture resistance life ○: −0.1 ≦ ΔC / C <0 Good voltage load moisture resistance life ×: ΔC / C <−0.1 Voltage load moisture resistance life Bad

(10) Temperature characteristic of capacitance The capacitance of the capacitor was measured from 20 ° C. to 125 ° C., and the rate of change in capacitance was determined with the capacitance at 20 ° C. as a reference. The judgment was based on the following criteria. The capacitance of the capacitor was measured using an automatic capacitance bridge. ⊚: | ΔC / C | ≦ 0.03 The change in capacitance due to temperature is small and the temperature characteristics are excellent. ○: 0.03 <| ΔC / C | ≦ 0.05 Change in capacitance due to temperature Small and good temperature characteristics x: | ΔC / C |> 0.05 Large change in capacitance with temperature and bad temperature characteristics

Example 1 (1) Production of Polyphenylene Sulfide Film Polyethylene terephthalate (hereinafter referred to as “polyethylene terephthalate”) containing 0.5 wt% of spherical silica having a diameter of 500 μm and an intrinsic viscosity of 0.55.
(Hereinafter referred to as PET) was subjected to solid phase polymerization at 230 ° C. for 15 hours under vacuum to obtain PET having an intrinsic viscosity of 0.82. The obtained PET and polyphenylene sulfide (hereinafter referred to as PPS) having a melt viscosity of 4000 poise under a shear rate of 200 sec ^{−1 at} 300 ° C. were supplied to separate extruders, and a double-tube type of a double tube type on the upper part of the die was melted. It guides so that the central layer becomes PPS by a laminating device, and then it is discharged from a T-die type die provided subsequently and rapidly cooled by a cooling rotary drum,
A substantially amorphous PET / PPS / PET three-layer laminate sheet was obtained. Then, the laminated sheet is caused to run in contact with a plurality of heating rolls having a surface temperature of 90 ° C., and stretched 3.7 times in the longitudinal direction between the heating roll group and a cooling roll having a peripheral speed different from that of 30 ° C. did. The uniaxially stretched sheet was stretched 3.5 times in a direction orthogonal to the longitudinal direction at 100 ° C. using a tenter, and then heat-treated at 260 ° C. for 10 seconds to give a total thickness of 6.0 μm and a PET layer thickness of 0.6 μm each. A laminated film of was obtained. The evaluation results of this film are shown in Table 1.
Shown in.

(2) Production and Evaluation of Capacitor Aluminum was vapor-deposited on one surface of the above laminated film so that the surface resistance value was 2 ohms. At that time, vapor deposition was performed in a stripe shape having a margin portion running in the longitudinal direction (the vapor deposition portion width was 8.0 mm, and the margin portion width was 1.0 mm). Insert a blade in the center of each vapor deposition part and the center of each margin part of this vapor deposition film and slit it to 0.5 on the left or right.
The tape was wound into a tape having a width of 4.5 mm with a margin of mm. The obtained tapes were wound one by one with a left margin and a right margin, respectively, and wound to obtain a wound body having an electrostatic capacity of about 0.1 μF. At that time, the two films were wound while being shifted so that the vapor deposition portion was protruded from the margin portion by 0.5 mm in the width direction. The core material was removed from these wound bodies, and pressed as it was at 180 ° C., 10 kg / cm ² temperature and pressure for 5 minutes. Further, metallikons were sprayed on both end faces to form external electrodes, and lead wires were welded to the metallikons to obtain capacitor elements. The obtained element is 220
After heat treatment at 2 ° C. for 2 hours, an exterior made of powdered epoxy resin was applied (average exterior thickness 0.5 mm) to prepare a capacitor. The evaluation results of this capacitor are shown in Table 1.

Example 2, Comparative Example 1 Polyphenylene sulfide was obtained in the same manner as in Example 1 except that the solid phase polymerization time was changed to change the intrinsic viscosity of PET. Table 1 shows the details and evaluation results of these films. Further, a capacitor was prepared from these films by the method described in Example 1. Table 1 shows the evaluation results of these capacitors.

Examples 3 to 6 and Comparative Examples 2 and 3 Polyphenylene sulfide was obtained in the same manner as in Example 1, except that the PET layer thickness and total thickness were variously changed. Table 1 shows the details and evaluation results of these films. Also,
Capacitors were prepared from these films by the method described in Example 1. Table 1 shows the evaluation results of these capacitors.

Examples 7 and 8 Various films having different surface roughnesses were obtained in the same manner as in Example 1 except that the inert particles added to the PET of the surface layer were changed. Table 1 shows the details of the structure and the evaluation results.
Further, a capacitor was prepared from these films by the method described in Example 1. Table 1 shows the evaluation results of this capacitor.
Shown in.

[0054]

[Table 1]

[0055]

As described above, in the polyphenylene sulfide laminated film of the present invention, the drawbacks of the conventional polyphenylene sulfide film can be solved, the low voltage breakdown frequency is low, the self-healing property and the humidity resistance under voltage load are improved. Thus, a capacitor having a constant capacitance over a wider temperature range and improved reliability, and a polyphenylene sulfide laminated film capable of manufacturing such a capacitor are obtained.

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location H01G 4/06 8019-5E // B29K 67:00 81:00 B29L 9:00 4F 31:34 4F

Claims (2)

[Claims] 1. A surface layer (A) made of a polyester film is formed on both surfaces of a central layer (B layer) made of a biaxially oriented poly-p-phenylene sulfide film having 70 mol% or more of repeating units represented by Structural Formula 1. Layer), wherein the total thickness of layer A is 3 times the thickness of layer B.
% Or more and 50% or less, and the intrinsic viscosity of polyester is 0.62 or more, The polyphenylene sulfide laminated film characterized by the above-mentioned. [Chemical 1] 2. A capacitor obtained by winding or laminating a metallized polyphenylene sulfide laminated film having aluminum vapor-deposited on at least one surface layer of the polyphenylene sulfide laminated film according to claim 1.