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    SUSTAINABLE SELF-REGULATING HEATING LAMINATE
    8.
    发明公开
    SUSTAINABLE SELF-REGULATING HEATING LAMINATE 审中-公开

    公开(公告)号：EP4294122A1

    公开(公告)日：2023-12-20

    申请号：EP22179004.1

    申请日：2022-06-14

    申请人： Borealis AG

    发明人： HAGSTRAND, Per-Ola ,  THORN, Niklas ,  EDEBLAD, Sven ,  SCHUETZ, Florian ,  SURESH BABU, Suhas Donthy ,  TORRES, Juan Pablo ,  GOSWAMI, Mithun

    IPC分类号： H05B3/34 ,  H05B3/14

    摘要： A flat sheet electrical heater, preferably obtainable by coextrusion or colamination, comprising:
    a plurality of elongate conductors, preferably evenly spaced apart from and preferably substantially parallel to each other,
    said conductors being at least partially embedded within and in contact with an electrically semiconductive composition with a positive temperature coefficient (PTC) comprising a polyethylene, polypropylene or a mixture thereof and a conductive filler,
    wherein said electrically semiconductive composition preferably is comprised in an extruded film having a machine direction
    and said elongate conductors are preferably parallel with the machine direction of the extruded film comprising the semiconductive composition;
    wherein the semiconductive composition has an electrical conductivity α from 2 to 50 S/m, measured at 40°C in accordance with the "Conductivity method" as described under "Determination methods",
    wherein 20°C ≤ TEq ≤ 50 °C and TEq is defined as the temperature where dσ/dT is at its minimum.