公开(公告)号：US11591444B2

公开(公告)日：2023-02-28

申请号：US16340219

申请日：2017-10-24

Applicant: Borealis AG

Inventor： Franciscus Jacobs ,  Guido Boelaers ,  Dietrich Gloger ,  Helmut Rinnerthaler

IPC: C08J5/18 ,  B32B15/085 ,  B32B15/20 ,  H01G4/04 ,  H01G4/18 ,  H01G4/32 ,  H01B3/22 ,  H01B3/44 ,  B32B37/20

Abstract: The present invention refers to a structure comprising a biaxially oriented polypropylene (BOPP) film having at least one layer comprising a homopolymer of propylene which layer is in contact with an oil phase, the homopolymer of propylene has a) a content of isotactic pentads in the range from 95% to 98%, and b) a content of ash of not more than 30 ppm, based on the total weight of the homopolymer of propylene, characterized in that the oil phase has an absorbance value of ≤0.1, relative to the pure oil, as determined spectrophotometrically at a wavelength of 860 nm by the reduction of transmitted light intensity. The present invention further refers to the use of a biaxially oriented polypropylene (BOPP) film for making capacitors comprising said structure, wherein the oil phase has an absorbance value of ≤0.1, relative to the pure oil, as determined spectrophotometrically at a wavelength of 860 nm by the reduction of transmitted light intensity as well as the use of the homopolymer of propylene for increasing the life time of a capacitor.

公开(公告)号：US20200040150A1

公开(公告)日：2020-02-06

申请号：US16340219

申请日：2017-10-24

Applicant: Borealis AG

Inventor： Franciscus Jacobs ,  Guido Boelaers ,  Dietrich Gloger ,  Helmut Rinnerthaler

IPC: C08J5/18 ,  B32B15/085 ,  B32B15/20 ,  B32B37/20 ,  H01G4/18 ,  H01G4/04 ,  H01G4/32

Abstract: The present invention refers to a structure comprising a biaxially oriented polypropylene (BOPP) film having at least one layer comprising a homopolymer of propylene which layer is in contact with an oil phase, the homopolymer of propylene has a) a content of isotactic pentads in the range from 95% to 98%, and b) a content of ash of not more than 30 ppm, based on the total weight of the homopolymer of propylene, characterized in that the oil phase has an absorbance value of ≤0.1, relative to the pure oil, as determined spectrophotometrically at a wavelength of 860 nm by the reduction of transmitted light intensity. The present invention further refers to the use of a biaxially oriented polypropylene (BOPP) film for making capacitors comprising said structure, wherein the oil phase has an absorbance value of ≤0.1, relative to the pure oil, as determined spectrophotometrically at a wavelength of 860 nm by the reduction of transmitted light intensity as well as the use of the homopolymer of propylene for increasing the life time of a capacitor.