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    Electret
    1.
    发明授权
    Electret 有权

    公开(公告)号：US10213716B2

    公开(公告)日：2019-02-26

    申请号：US15301902

    申请日：2015-03-31

    Applicant: TOYOBO CO., LTD.

    Inventor： Yoshiyuki Kitagawa ,  Toshikatsu Enjoji

    IPC: B01D39/16 ,  B03C3/28 ,  H01G7/02 ,  B01D46/00 ,  D06M15/256 ,  D06M101/20 ,  D06M101/18

    Abstract: [Problems]An object of the present invention is to provide an electret with an initial increased electrostatic charge quantity and suppressed attenuation of electrostatic charge to liquid particles.[Means for solving]The electret is obtained by depositing polytetrafluoroethylene having a melting point of 35° C. or higher and 320° C. or lower on a carrier and imparting an electrostatic charge to at least one of the carrier and the polytetrafluoroethylene.

    ELECTRET AND FILTER USING THE SAME
    2.
    发明申请
    ELECTRET AND FILTER USING THE SAME 有权

    公开(公告)号：US20220288560A1

    公开(公告)日：2022-09-15

    申请号：US17635623

    申请日：2020-08-19

    Applicant: TOYOBO CO., LTD.

    Inventor： Yoshiyuki Kitagawa ,  Satoru Harada ,  Keiko Sakaguchi ,  Sadahito Goto

    IPC: B01J20/26 ,  B01J20/22 ,  B01J20/28 ,  B01J20/30 ,  B01D46/00 ,  B01D39/16

    Abstract: It is provided that an electret having excellent filtering performance and a filter using the electret even in a case where polyolefin resin and magnesium element are contained. An electret comprising a polyolefin resin and a nitrogen-containing compound, wherein 0.1 to 5 parts by mass of the nitrogen-containing compound is contained to 100 parts by mass of the polyolefin resin, a proportion of a magnesium element contained in the electret is 5 to 100 ppm, and a QF value represented by the following formula is not less than 1.00 mmAq−1 when particles having particle diameters of 0.3 to 0.5 μm are to be collected. QF [mmAq−1]=— [1n (particle penetration (%)/100)]/[ventilation resistance (mmAq)]

    Electret and electret filter
    3.
    发明授权
    Electret and electret filter 有权

    公开(公告)号：US10940415B2

    公开(公告)日：2021-03-09

    申请号：US15764546

    申请日：2016-09-21

    Applicant: TOYOBO CO., LTD.

    Inventor： Yoshiyuki Kitagawa

    IPC: B01D39/16 ,  B03C3/28 ,  B03C3/45 ,  B03C3/64 ,  D06M13/08 ,  D06M15/277 ,  D06M15/256 ,  D06M10/02 ,  D06M10/08 ,  D06N3/00 ,  D06N3/04

    Abstract: An electret is disclosed including: a carrier, and polytetrafluoroethylene having a melting point of 35° C. or higher and 320° C. or lower deposited on the carrier, wherein the electret imparts an electrostatic charge to at least one of the carrier and the polytetrafluoroethylene, and has two or more melting point peaks in simultaneous thermogravimetry and differential thermal analysis. An electret filter is disclosed which preferably is used for a filter which requires durability to tobacco smoke. An electret filter is also disclosed having a fluorine-containing component deposited on a fiber surface, wherein an initial QF value is 0.5 mmAq−1 or more in collection efficiency of particles having a particle diameter of 0.3 to 0.5 μm at a wind speed of 5 cm/s, and a filter deterioration rate by tobacco smoke loading is −8/(g/m2) or more.

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