公开(公告)号：US11342116B2

公开(公告)日：2022-05-24

申请号：US16633062

申请日：2018-08-01

申请人： Oji Holdings Corporation

发明人： Michiko Sueyoshi ,  Akihiro Kakehi ,  Takeshi Tominaga ,  Yoshimune Okuyama

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)].

公开(公告)号：US11142618B2

公开(公告)日：2021-10-12

申请号：US16335376

申请日：2017-09-22

申请人： Oji Holdings Corporation

发明人： Takeshi Tominaga ,  Michiko Sueyoshi ,  Yoshimune Okuyama ,  Masahiro Nakata ,  Tadakazu Ishiwata

IPC分类号： C08J5/18 ,  C08L23/12 ,  H01G4/18

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).