Radio frequency heating of thermoplastic receptor compositions

A method of applying a thermoplastic composition, said method comprising the steps of:

• (a) applying radio signals having a frequency of about 3 to 35 MHz at a voltage ranging from about 1000 to 50,000 volts and an average current ranging from about 0.05 amps to 5 amps to a composition comprising a major portion of thermoplastic and a receptor, said thermoplastic selected from the group consisting of a vinyl polymer, a polyester, a polyamide, a polyamide, a polyether, a block polyamide-polyether, a block polyester-polyether, a polycarbonate, a polysulfone, a polybis-imidazole, a polybisoxazole, a polybisthiazole, a polyphenyl, a polyacetal, a polyester, a polyurethane, a polyphenyl-aniline sulfide, a polyolefin, a polyether ketone, butyl rubber, an ethylene vinyl acetate copolymer, a styrene block copolymer, or mixtures thereof, said receptor having a dissipation factor of about 0.1 or greater and a dielectric constant of at least about 0.1 or greater, said receptor selected from the group consisting of an alkali or alkaline earth metal sulfate salts, aluminum trihydrate, a quaternary ammonium salt, a phosphonate compound, a phosphate compound, a polystyrene sulfonate sodium salt, or mixtures thereof;
• (b) applying said composition to a first substrate and applying a second substrate to said composition;
• (c) placing the first and second receptor laden substrates between two plates and applying radio signals to the composition deposited between the first and second substrates;
• and
• (d) dissipating the radio signals received by the receptor as thermal energy in an amount effective to form said composition to a thermoplastic bond between said first and second substrates.