POLYMER THICK FILM POSITIVE TEMPERATURE COEFFICIENT CARBON COMPOSITION

摘要

The invention is directed to a polymer thick film positive temperature coefficient carbon resistor composition consisting essentially of;
(a) organic medium consisting of:
(i) a fluoropolymer resin consisting of a copolymer of vinylidene difluoride and hexafluoropropylene; and(ii) an organic solvent consisting of triethyl phosphate; and(b) conductive carbon powder. The composition may be processed at a time and temperature necessary to remove all solvent.;The invention is further directed to positive temperature coefficient (PTC) circuits comprising the composition of the invention which has been dried to remove the solvent and to articles, e.g., mirror heaters and seat heaters, containing such PTC circuits as well as a method for making such PTC circuits.

主权项

1. A polymer thick film positive temperature coefficient carbon resistor composition, consisting essentially of:
(a) 50 to 99 weight percent organic medium, consisting of:
(i) a fluoropolymer resin consisting of a copolymer of vinylidene difluoride and hexafluoropropylene; and(ii) an organic solvent consisting of triethyl phosphate, wherein the fluoropolymer resin is 10 to 50 weight percent of the total weight of the organic medium and is dissolved in the organic solvent; and (b) 1 to 50 weight percent conductive carbon powder, wherein the conductive carbon powder is dispersed in the organic medium and wherein the weight percent of the organic medium and the conductive carbon powder are based on the total weight of the polymer thick film positive temperature coefficient carbon resistor composition.