Method for annealing PTC compositions

Details Method for annealing PTC compositions Method for annealing PTC compositions

1980-05-19

1982-03-09

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Treating shaped or solid article

By a temperature change

264105, B29C 2500

Patent

active

043188818

ABSTRACT:
A method of annealing a PTC conductive polymer composition comprising a mixture of two crystalline polymers. Compositions having improved electrical characteristics are obtained by annealing at a temperature between the melting points of the two polymers, preferably closer to the melting point of the lower melting polymer. Particularly useful results are obtained when the annealing method is applied to a self-limiting heater in which the PTC core comprises carbon black dispersed in a mixture of polymers, one of which has a melting point of at least 160.degree. C., preferably at least 200.degree. C., e.g. a mixture of polyvinylidene fluoride and an ethylene/tetrafluoroethylene copolymer.

REFERENCES:
patent: 3823217 (1974-07-01), Kampe
patent: 3861029 (1975-01-01), Smith-Johannson et al.
patent: 3914363 (1975-10-01), Bedard et al.
patent: 4177376 (1979-12-01), Horsma et al.

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