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US 5,344,591 AGranted
Self-regulating laminar heating device and method of forming same
OwnerJack H. Smucklerinventor
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Abstract
A positive temperature coefficient composition comprising a dispersion of conductive particles in a solvated or solvatable crystalline organic polymer is disclosed. Temperature self-regulating devices incorporating the composition and related method of manufacture are described.
Claims5
A PTC composition comprising:
- a. a continuous, single phase solution comprising (1) greater than 10% by weight of a crystalline polyurethane or polychloroprene polymer having a degree of crystallinity of at least 5%, and (ii) an organic solvent or solvent blend, wherein said polymer remains soluble in said solvent or solvent blend at a temperature in the range of from about 60.degree. F. to about 80.degree. F.;
- and
- b. electrically conductive particulate material dispersed throughout said single phase solution in an amount of from about 20% to about 60% by weight,
- wherein said composition when dried has a switching temperature which approximates the crystalline melt temperature of the polymer.
1 more element
Dependencies are inferred from the claim text.