Electrical insulation film
AssigneeBorealis Technology Oy
InventorsManfred Stadlbauer, Eberhard Ernst, Lauri Huhtanen, Yvo Daniels, Franck Jacobs
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Abstract
The present invention relates to a capacitor film comprising a biaxially oriented polypropylene wherein a) said polypropylene has a draw ratio in machine direction of at least 4.0 and a draw ratio in transverse direction of at least 4.0, and b) said polypropylene has an electrical breakdown strength EB63% according to IEC 60243-part 1 (1988) of at least 300 kV/mm at a draw ratio in machine direction and in transverse direction of 4.0.
Claims23
Capacitor film comprising a biaxially oriented polypropylene wherein
- a) said polypropylene being of the type obtained in the presence of a metallocene catalyst and has a draw ratio in machine direction in the range of 4.0 to 8.0 and a draw ratio in transverse direction of 6.0 to 10.0, and
- b) said polypropylene and/or said capacitor film has(have) an electrical breakdown strength EB63% according to IEC 60243-part 1 (1988) of at least 300 kV/mm at a draw ratio in machine direction and in transverse direction of 4.0.
A capacitor comprising, at least one layer comprising a capacitor film having a biaxially oriented polypropylene wherein a) said polypropylene being obtained in the presence of metallocene catalyst and has a draw ratio in machine direction in the range of 4.0 to 8.0 and a draw ratio in transverse direction of 6.0 to 10.0, and b) said polypropylene and/or said capacitor film has(have) an electrical breakdown strength EB63% according to IEC 60243-part 1 (1988) of at least 300 kV/mm at a draw ratio in machine direction and in transverse direction of 4.0.
A process for the preparation of a capacitor film comprising,
- providing a polypropylene, wherein said polypropylene being obtained in the presence of a metallocene catalyst has a draw ratio in machine direction in the range of 4.0 to 8.0 and a draw ratio in transverse direction of 6.0 to 10.0, and said polypropylene and/or said capacitor film has(have) an electrical breakdown strength EB63% according to IEC 60243-part 1 (1988) of at least 300 kV/mm at a draw ratio in machine direction and in transverse direction of 4.0;
- and
- forming said polypropylene into a biaxially oriented film.
Dependencies are inferred from the claim text.