Self limiting microwave heaters

Details Self limiting microwave heaters Self limiting microwave heaters

1993-05-21

1995-04-25

Leung, Philip H.

Electric heating

Microwave heating

Cookware

219759, 426234, 426243, H05B 680

Patent

active

054101352

ABSTRACT:
A self-limiting dispersion of a conductive material in a binder is disclosed wherein the conductive material consists essentially of a carbon material having a structure selected to undergo percolation when dispersed in the binder at a concentration of from about 10 weight percent to about 45 weight percent. The binder comprises a thermoplastic material selected to go through a first order phase transition or a second order transition at a temperature from about 300.degree. F. to about 480.degree. F. and the dispersion is formulated near the conductance percolation threshold so that its electrical conductivity drops precipitously (e.g., at least about 1.5 orders of magnitude) above the binder transition temperature. The dispersion of the conductive material in the binder is especially suitable for use as a self-limiting microwave heater material which is either a molding composition, or surface coating composition, and especially a composition that can be applied to a substrate by printing.

REFERENCES:
patent: 4864089 (1989-09-01), Tighe et al.
patent: 4866232 (1989-09-01), Stong
patent: 4917848 (1990-04-01), Kurita et al.
patent: 5022826 (1991-03-01), Pollart et al.
patent: 5132144 (1992-07-01), Parks
Oct. 3, 1994 International Search Report in PCT/US94/04968.
Benguigui et al., On the Percolative Behavior of Carbon Black Cross-Linked Polyethylene Systems, J. Poly. Sc: Part B: Polymer Physics, vol. 25, pp. 127-135 (1987).
Sumita et al., Dispersion of Fillers and the Electrical Conductivity of Polymer Blends Filled with Carbon Black, Polymer Bulletin vol. 25, No. 1, Jan. 1991, pp. 265-273.
Brodeur et al., Phase Change Materials for Thermal Stabilization of Composite Thermistors, J. of Materials Research, vol. 6, No. 1, Jan. 1991. pp. 175-182.
Voet, Temperature Effect of Electrical Resistivity of Carbon Black Filled Polymers, Rubber Chemistry and Technology, vol. 54 No. 1, Mar.-Apr. 1981 ISSN 0035-9475, pp. 43-50.
Sherman et al., Electron Transport Processes in Conductor-Filled Polymers, Polymer Engineering and Science, vol. 23, No. 1, Jan. 1983, pp. 36-46.
Sumita et al., Effect of Melt Viscosity and Surface Tension of Polymers on the Percolation Threshold of Conductive-Particle-Filled Polymeric Composites, J. Macromol. Sci.-Phys., vol. B25 Nos. 1 & 2, 1986, pp. 171-184.
Kirkpatrick, Percolation and Conduction, Reviews of Modern Physics, vol. 45, No. 1, Oct. 1973, pp. 574-588.
Narkis et al., Electrical Properties of Carbon Black Filled Polyethylene, Polymer Engineering and Science, vol. 18, No. 8, Jun. 1978, pp. 649-653.
Sichel et al., Tunneling Conduction in Carbon-Polymer Composites, Marcel Decker, Inc., 1982, pp. 51-77.
Beuche, A New Class of Switching Materials, J. of Applied Physics, vol. 44 No. 1, Jan. 1973, pp. 532-533.
Nakkis et al., Electrical Properties of Carbon Black Filled Crosslinked Polyethylene, Polymer Engineering and Science, vol. 21, No. 18, Nov. 1981, pp. 1049-1054.

Affiliated with

Also associated with

Rating

Self limiting microwave heaters does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Self limiting microwave heaters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self limiting microwave heaters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1569347