Abstract: A short-chain-branched polypropylene having xylene solubles of at least 0.5 percent by weight is provided. In certain embodiments the polypropylene has a strain hardening index of at least 0.15 as measured by a deformation rate of 1.00 s?1 at a temperature of 180° C. In certain embodiments, the strain hardening index is defined as the slope of the logarithm to the basis 10 of the tensile stress growth function as function of the logarithm to the basis 10 of the Hencky strain for the range of the Hencky strains between 1 and 3. The polypropylene may have xylene solubles in the range of 0.5 to 1.5 percent by weight. In certain embodiments, the polypropylene has a strain hardening index in the range of 0.15 to 0.30. In certain embodiments, the polypropylene has a melting point of at least 148° C.

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.

Abstract: A polypropylene with a low amount of impurities, in particular a low amount of aluminum and boron residues.

Abstract: Certain embodiments of the present technology provide a cable layer comprising a polypropylene material, where the cable layer and/or the polypropylene material comprise a crystalline fraction that crystallizes in a temperature range of 200 to 105° C., determined by stepwise isothermal segregation technique. The crystalline fraction comprises a part which during subsequent melting of the crystalline fraction at a melting rate of 10° C./min, the part melts at or below 140° C. and the part represents at least 10 percent by weight of the crystalline fraction. Certain embodiments also provide a process for the preparation of a cable layer, comprising providing the polypropylene material described herein and forming the polypropylene material into a cable layer.

Abstract: 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° C. to 105° 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° C./min. Certain embodiments present a capacitor film where the part melts at or below 140° C. In other embodiments, the said part melts at or below the temperature T=Tm?3° 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.

Abstract: A short-chain-branched polypropylene having xylene solubles of at least 0.5 percent by weight is provided. In certain embodiments the polypropylene has a strain hardening index of at least 0.15 as measured by a deformation rate of 1.00 s?1 at a temperature of 180° C. In certain embodiments, the strain hardening index is defined as the slope of the logarithm to the basis 10 of the tensile stress growth function as function of the logarithm to the basis 10 of the Hencky strain for the range of the Hencky strains between 1 and 3. The polypropylene may have xylene solubles in the range of 0.5 to 1.5 percent by weight. In certain embodiments, the polypropylene has a strain hardening index in the range of 0.15 to 0.30. In certain embodiments, the polypropylene has a melting point of at least 148° C.