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公开(公告)号：US11142618B2
公开(公告)日：2021-10-12
申请号：US16335376
申请日：2017-09-22
摘要： A biaxially stretched polypropylene film including a polypropylene resin and satisfying the following: (a) the crystallite size Sa, which is determined using the Scherrer equation from the full width at half maximum of the α-crystal (040) plane reflection peak as measured by wide-angle x-ray diffraction after treatment for 200 hours at 105° C., is not more than 12.9 nm; and (b) the planar orientation coefficient ΔPa, which is calculated from the birefringence values ΔNyz and ΔNxz with respect to the thickness direction as determined by optical birefringence measurement after treatment for 200 hours at 105° C., is at least 0.013 (ΔPa=(ΔNyz+ΔNxz)/2).
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2.发明授权公开(公告)号：US11926730B2
公开(公告)日：2024-03-12
申请号：US18301895
申请日：2023-04-17
CPC分类号： C08L23/12 , C08J5/18 , H01G4/14 , H01G4/32 , C08J2323/12 , C08J2423/12 , C23C14/20
摘要： A polypropylene film which is capable of suppressing blocking in a rolled polypropylene film. The polypropylene film has a first surface and a second surface, contains a polypropylene resin as a main component, and is configured such that: the Svk value (SvkA) of the first surface is 0.005 μm or more and 0.030 μm or less; the Spk value (SpkA) of the first surface is more than 0.035 μm and 0.080 μm or less; the Svk value (SvkB) of the second surface is 0.005 μm or more and 0.030 μm or less; and the Spk value (SpkB) of the second surface is 0.015 μm or more and 0.035 μm or less.
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3.发明授权公开(公告)号：US11661507B2
公开(公告)日：2023-05-30
申请号：US17930839
申请日：2022-09-09
CPC分类号： C08L23/12 , C08J5/18 , H01G4/14 , H01G4/32 , C08J2323/12 , C08J2423/12 , C23C14/20
摘要： A polypropylene film which is capable of suppressing blocking in a rolled polypropylene film. The polypropylene film has a first surface and a second surface, contains a polypropylene resin as a main component, and is configured such that: the Svk value (SvkA) of the first surface is 0.005 μm or more and 0.030 μm or less; the Spk value (SpkA) of the first surface is more than 0.035 μm and 0.080 μm or less; the Svk value (SvkB) of the second surface is 0.005 μm or more and 0.030 μm or less; and the Spk value (SpkB) of the second surface is 0.015 μm or more and 0.035 μm or less.
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4.发明授权公开(公告)号：US11492475B2
公开(公告)日：2022-11-08
申请号：US16767092
申请日：2018-12-26
摘要： A polypropylene film which is capable of suppressing blocking in a rolled polypropylene film. The polypropylene film has a first surface and a second surface, contains a polypropylene resin as a main component, and is configured such that: the Svk value (SvkA) of the first surface is 0.005 μm or more and 0.030 μm or less; the Spk value (SpkA) of the first surface is more than 0.035 μm and 0.080 μm or less; the Svk value (SvkB) of the second surface is 0.005 μm or more and 0.030 μm or less; and the Spk value (SpkB) of the second surface is 0.015 μm or more and 0.035 μm or less.
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公开(公告)号：US11342116B2
公开(公告)日：2022-05-24
申请号：US16633062
申请日：2018-08-01
IPC分类号： C08J5/18 , H01B3/44 , B32B15/085 , B32B27/32 , H01G4/14 , C23C14/24 , H01G4/32 , C08J7/04 , C08J7/044
摘要： A polypropylene film which has a crystallite size of not more than 12.2 nm, the crystallite size being determined using Scherrer's equation from a full width at half maximum of the reflection peak from (040) plane of α crystal measured by a wide-angle X-ray diffraction method, and a volume resistivity of not lower than 6×1014 Ω·cm, the volume resistivity being calculated in accordance with equation I from a current value that is measured 1 minute after applying a voltage at a potential gradient of 200 V/μm in an environment at 100° C. Equation I: volume resistivity=[(effective electrode area)×(applied voltage)]/[(polypropylene film thickness)×(current value)].
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6.发明授权公开(公告)号：US11961683B2
公开(公告)日：2024-04-16
申请号：US17261826
申请日：2019-08-28
CPC分类号： H01G4/32 , B29C55/12 , H01G4/18 , C08L2203/16 , C08L2203/20
摘要： A biaxially stretched polypropylene film which has a thickness of from 1.0 μm to 3.5 μm, a tensile fracture stress at 135° C. of 70 MPa or more in a first direction, and a difference between the tensile fracture stress at 125° C. in the first direction and the tensile fracture stress at 135° C. in the first direction of from 0 MPa to 15 MPa (inclusive).
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公开(公告)号：US10910164B2
公开(公告)日：2021-02-02
申请号：US15562739
申请日：2016-03-31
摘要： The present invention relates to a biaxially stretched polypropylene film for capacitor. The biaxially stretched polypropylene film for capacitor of the present invention can suppress an increase in tan δ and a decrease in the electrostatic capacitance even when the capacitor is used at a high voltage and an elevated temperature for a long duration.
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