To provide a high frequency sealing material which can be sealed by the application of high frequency voltage, maintains the rigidity and heat resistance of polypropylene, is transparent, is excellent in sealability at a good sealing rate and in low energy, and gives a high sealing strength.
The high frequency sealing material comprises (A) random polypropylene having a melting point of ≤140°C and (B) an ionomer prepared by neutralizing a part or all of the carboxyl groups of a random copolymer produced by at least copolymerizing ethylene with an unsaturated carboxylic acid with potassium, or has a heat-generating layer comprising (B) the ionomer and (C) polypropylene, and a heat-melting layer comprising (A) the random polypropylene, disposed on at least one side of the heat-generating layer and meltable with heat.
NAKADA KAZUYUKI
Kato Kazunori
Katsuichi Nishimoto
Hiroshi Fukuda