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Polypropylene with specific calcium stearate content for special capacitors

A technology of calcium stearate and polypropylene, which is applied in the direction of capacitors, laminated capacitors, and fixed capacitor dielectrics, and can solve problems such as ripples, mechanical stress damage, and wrinkles

Inactive Publication Date: 2015-12-23
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this particular capacitor design is that the extra flattening step also causes mechanical stress and damage to the biaxially oriented polypropylene (BOPP) and the internal winding causes wrinkling and ripples from the inside to the outside

Method used

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  • Polypropylene with specific calcium stearate content for special capacitors

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Embodiment approach

[0019] According to one embodiment of the invention, this high purity is not achieved by washing steps.

[0020] As mentioned above, the polypropylene of the capacitor film is biaxially oriented. Preferably the biaxially oriented polypropylene (BOPP) has a stretch ratio of at least 4.0 in the machine direction and at least 4.0 in the transverse direction. Such ratios are preferred because commercial biaxially oriented polypropylene films must be stretchable without interruption at least to the extent defined above. During stretching in the machine direction, the length of the sample increases, and the stretch ratio in the machine direction can be calculated from the ratio of the current length over the original sample length. Next, the sample is stretched in the transverse direction, where the width of the sample increases. Thus, the stretch ratio can be calculated from the width of the current sample over the original width of the sample. Preferably the stretch ratio of th...

Embodiment

[0063] A. Measurement method

[0064] The following definitions of terms and determination methods apply to the above general description of the invention and to the following examples unless otherwise defined.

[0065] pass 13 Quantification of Isotacticity in Polypropylene by C NMR Spectroscopy

[0066] According to the basic method in for example document V.BusicoandR.Cipullo, Progressin PolymerScience, 2001,26,443-533, by quantitative 13 C nuclear magnetic resonance (NMR) spectroscopy to determine isotacticity. The experimental parameters are adjusted to ensure that the measured values ​​of the quantitative spectra are suitable for this specific task eg in the documents S. Berger and S. Braun 200 and More NMR Experiments: APractical Course 2004, Wiley-VCH Weinheim. Quantities are calculated in a manner known in the art by using simple corrected ratios of the signal integrals of representative sites. Isotacticity was determined at the pentad level, ie the mmmm fraction ...

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Abstract

Capacitor film comprising a biaxially oriented polypropylene (BOPP) and more than 100 to below or equal 400 ppm of an alkali earth fatty acid salt.

Description

[0001] This application is a divisional application based on the following Chinese patent application: [0002] Date of original filing: May 6, 2011 [0003] Original application number: 201180023246.5 (PCT / EP2011 / 057322) [0004] Title of original application: Polypropylene with specified calcium stearate content for special capacitors technical field [0005] The present invention relates to a new capacitor film based on biaxially oriented polypropylene (BOPP). Background technique [0006] Polypropylene is the material of choice in the field of film capacitors because its chains lack any kind of polar groups that align under electric field stress. As a result, polypropylene has inherently low dissipation factor and high volume resistivity. These properties, combined with a relatively high dielectric constant and self-healing properties in capacitors, make polypropylene valuable in this technical field. When the polypropylene is biaxially stretched (ie, biaxially orien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K5/098H01G4/33
CPCC08K5/098H01G4/33C08L2203/16C08L23/12H01G4/18Y10T428/31692C08L23/10B32B15/085C08J5/18H01G2/00B32B2457/16B32B2250/02
Inventor 弗朗西斯库斯·雅各布斯
Owner BOREALIS AG