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Biaxially oriented polypropylene film, metallized film and film capacitors

A polypropylene film, biaxial stretching technology, used in the direction of fixed capacitor dielectric, fixed capacitor parts, electric vehicles, etc., can solve the problem that the roughness of both sides of the film cannot be fully controlled, and the roughness cannot fully meet the withstand voltage. It has the advantages of excellent processing adaptability, excellent surface characteristics, and high withstand voltage.

Active Publication Date: 2015-08-05
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this production method cannot sufficiently control the degree of roughness on both sides of the film, and the degree of fine roughness of the obtained film cannot fully satisfy the withstand voltage and device processability required especially for automotive applications.

Method used

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  • Biaxially oriented polypropylene film, metallized film and film capacitors
  • Biaxially oriented polypropylene film, metallized film and film capacitors
  • Biaxially oriented polypropylene film, metallized film and film capacitors

Examples

Experimental program
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Effect test

Embodiment 1

[0249]A branched-chain polypropylene resin (high melting point) manufactured by Basell was blended into a linear polypropylene resin manufactured by Prime Polymer Co., Ltd. with an isotactic pentad fraction of 0.985 and a melt flow rate (MFR) of 2.6 g / 10 min. Tension polypropylene Profax PF-814) 0.5% by mass, these are supplied to an extruder at a temperature of 250°C, melted and extruded in a sheet form through a T-shaped slit die at a resin temperature of 250°C, and the melted sheet is maintained at It was solidified by cooling on a cooling drum with a diameter of 1 m at 90° C. to obtain an unstretched film. The hold time on the cooling drum was 2.5 seconds. Next, the unstretched film was slowly preheated to 140°C, and then passed between rollers maintained at a temperature of 145°C and provided with a peripheral speed difference, and stretched in the longitudinal direction at a stretching ratio of 4.5 times. stretch. At this time, stretching was carried out by supplementi...

Embodiment 2

[0251] Except having set the temperature of the cooling drum to 75° C., film formation was carried out in the same manner as in Example 1 to obtain a biaxially stretched polypropylene film. The stretching conditions of the obtained biaxially stretched polypropylene film are shown in Table 2, and the properties of the obtained film are shown in Tables 3 and 4.

Embodiment 3

[0253] A film was formed in the same manner as in Example 1, except that the cooling drum temperature was 95° C. and the temperature holding time on the cooling drum was 1.7 seconds, to obtain a biaxially stretched polypropylene film. The stretching conditions of the obtained biaxially stretched polypropylene film are shown in Table 2, and the properties of the obtained film are shown in Tables 3 and 4.

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Abstract

An object of the present invention is to provide a biaxially stretched polypropylene film that exhibits excellent electrical resistance and safety properties and can secure stable device processability even in high-voltage capacitor applications. Therefore, the present invention provides a biaxially stretched polypropylene film having protrusions on both sides, characterized in that the thickness t1 is 1 μm to 3 μm, the tensile strength in the longitudinal direction is 120 MPa to 250 MPa, and the tensile strength in the width direction is The strength is 250MPa ~ 400MPa, on any surface, the minimum protrusion height Pmin is 100nm or more, and the maximum protrusion height Pmax is 1600nm or less, and when one surface is set as A surface and the other surface is set as B surface, the following All conditions in formulas (1) to (3): 0.5≤Pa250-450 / Pa≤1.0 (1); 0.5≤Pb450-1600 / Pb≤1.0 (2); 600≤Pa+Pb≤1200 (3).

Description

technical field [0001] The present invention relates to a biaxially oriented polypropylene film suitable for packaging, industrial use, etc., and more particularly, to an excellent biaxially oriented polypropylene film having high withstand voltage and suitable device processability as a dielectric for capacitors , and a metallized film and a film capacitor using the biaxially stretched polypropylene film. Background technique [0002] Biaxially oriented polypropylene films are used in various applications such as packaging applications, tape applications, and electrical applications represented by cable sheathing and capacitors due to their excellent transparency, mechanical properties, and electrical properties. [0003] Among them, in capacitor applications, it is particularly ideally used not only in DC applications and AC applications but also in high-voltage capacitor applications due to its excellent withstand voltage characteristics and low loss characteristics. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/12C08J5/18H01G4/18B29L7/00B29L9/00B29L31/34
CPCB29C55/143B29K2023/10B29L2031/3406C08J5/18C08J2323/12H01G4/18Y02T10/70Y10T428/24479Y10T428/24529Y10T428/24545B29C55/12H01G4/08
Inventor 门野照雄浅野哲也水岛正美中冢贵典
Owner TORAY IND INC