| abstract |
PROBLEM TO BE SOLVED: To provide a self-temperature-controllable sheet heating element excellent in long-term stability with improved resistance stability at the time of applying power by suppressing the temperature dependence of resistance value in a low temperature region. I do. SOLUTION: A planar heating portion 3 is formed by a crosslinked product of a mixture of a styrene-butadiene copolymer, an ethylene-based crystalline polymer having a melting point of 60 to 120 ° C, and a conductivity-imparting material. |