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Biaxially oriented polypropylene film, metal film laminated film and film capacitor

A polypropylene film, biaxially oriented technology, used in film/thick film capacitors, metal layered products, fixed capacitor dielectrics, etc., can solve the problems of limited heat resistance effect and unsatisfactory high temperature withstand voltage characteristics Achieving the effect of excellent withstand voltage characteristics

Active Publication Date: 2020-08-18
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 2, since the melting point of the film is 175°C or lower, the effect of heat resistance is limited, and the high-temperature withstand voltage characteristics exceeding 105°C required for current capacitors are not satisfied.

Method used

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  • Biaxially oriented polypropylene film, metal film laminated film and film capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] A. Manufacture of polypropylene resin composition

[0127] Phthalic anhydride was added to the solution which mixed anhydrous magnesium chloride, decane, and 2-ethylhexyl alcohol, and heated, and it stirred further. After the above solution was cooled, it was added dropwise to titanium tetrachloride cooled to -20°C. Next, the temperature of the above-mentioned mixture was raised, and diisobutyl phthalate was added and stirred, and then, a solid was obtained by filtration. The obtained solid was washed with decane and hexane to obtain a titanium catalyst used for propylene polymerization.

[0128] Propylene polymerization was carried out using the aforementioned titanium catalyst, triethylaluminum as a cocatalyst, dicyclopentyldimethoxysilane, and hydrogen as a chain transfer agent. After the obtained product was inactivated, it was washed sufficiently with propylene monomer to obtain a polypropylene resin. The polypropylene resin had a melting point of 165° C., an MF...

Embodiment 2

[0133] A biaxially oriented polypropylene film having a thickness of 2.5 μm was obtained in the same manner as in Example 1 except that the stretching speed in the longitudinal stretching step was 3,550,000% / min. In addition, there was no film breakage at the time of film formation for 1 hour. Table 1 shows the physical properties of the obtained film.

Embodiment 3

[0135] The addition amount of triethylaluminum as a co-catalyst during the production of polypropylene resin was adjusted, and the mesopentad fraction (mmmm) of polypropylene resin was changed so that it became 0.950, except that it was the same as in Example 1 production, and a biaxially oriented polypropylene film with a thickness of 2.5 μm was obtained. In addition, there was no film breakage at the time of film formation for 1 hour. Table 1 shows the physical properties of the obtained film.

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Abstract

The present invention provides a biaxially oriented polypropylene film, a metal film laminated film, and a film capacitor excellent in room temperature and high temperature withstand voltage characteristics. The present invention is a biaxially oriented polypropylene film, which is a biaxially oriented polypropylene film having a polypropylene resin as a main component, and which exists on the highest temperature side in the first heating curve when the melting peak is measured using DSC. The first melting peak Tm1 is 176 to 180°C.

Description

technical field [0001] The present invention relates to a biaxially oriented polypropylene film, a metal film laminated film, and a film capacitor that are excellent in high-temperature withstand voltage characteristics when used as a dielectric for film capacitors. Specifically, it relates to a biaxially oriented polypropylene film that is excellent not only in withstand voltage characteristics at room temperature but also in high temperature conditions, and can be suitably used as a dielectric for film capacitors. Background technique [0002] Biaxially oriented polypropylene films are used in various applications such as packaging applications, tape applications, and electrical applications represented by cable wrapping and capacitors because of their excellent transparency, mechanical properties, and electrical properties. [0003] Among them, in capacitor applications, because of its excellent withstand voltage characteristics and low loss characteristics, it is not lim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/12B32B15/085C08J5/18H01G4/18B29K23/00B29L7/00
CPCB29C55/12C08J5/18B29L2007/00B29K2023/12B29L2009/003C08J2323/12B32B27/08B32B2307/306B32B27/32B32B2307/406B32B2307/204B32B27/20B32B2307/518B32B27/18B32B2457/16B29C55/005B29D7/01B32B15/085H01G4/18H01G4/33
Inventor 藤本聪一浅野哲也
Owner TORAY IND INC