Borealis Technology Oy

Treofan Germany Gmbh & Co. Kg

Franck Jacobs

Yvo Daniels

Eberhard Ernst

Manfred Stadlbauer

Lauri Huhtanen

Detlef Busch

Joachim Fiebig

Thilo Mohr

Petri Lehmus

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.

Electrical insulation film

The present technology relates to a biaxially oriented polypropylene film. The biaxially oriented polypropylene film comprises a polypropylene material having xylene solubles of at least 0.5 percent by weight. The polypropylene also has a strain hardening index of at least 0.15 measured at a deformation rate d&#x3b5;/dt of 1.00 sat a temperature of 180&#xb0; C. In certain embodiments, the strain hardening index is defined as the slope of a logarithm to the basis 10 of a tensile stress growth function as a function of a logarithm to the basis 10 of a Hencky strain for the range of Hencky strains between 1 and 3.

Biaxially oriented polypropylene film

The invention relates to a biaxially oriented electrical insulating film which contains a mixture from a polypropylene P1 and a polypropylene P2 which is different therefrom. The polypropylene P1 is a linear polypropylene and has an Mw/Mn&#x3e;5 and a mesopentadene isotactic index of at least 95% and the polypropylene P2 has a long-chain branching.

Biaxially oriented electrical insulating film

Certain embodiments of the present technology provide a capacitor film comprising a polypropylene material. The capacitor film comprises xylene solubles of at least 0.5 percent by weight. In certain embodiments the xylene solubles are in a range of 0.5 to 1.5 percent by weight. The film also comprises a crystalline fraction melting in the temperature range of 200&#xb0; C. to 105&#xb0; C. determined by stepwise isothermal segregation technique. The crystalline fraction comprises a part, the part representing at least 10 percent by weight of said crystalline fraction, and wherein the part melts at a melting rate of 10&#xb0; C./min. Certain embodiments present a capacitor film where the part melts at or below 140&#xb0; C. In other embodiments, the said part melts at or below the temperature T=Tm&#x2212;3&#xb0; C., wherein Tm is the melting temperature of the capacitor film and/or the polypropylene material, and the part represents at least 45 percent by weight of the crystalline fraction.

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Evergem, Belgium

Franck Jacobs