Method for producing conductive polymeric coatings with positive

Details Method for producing conductive polymeric coatings with positive Method for producing conductive polymeric coatings with positive

1995-09-22

1996-09-17

Lieberman, Paul

Compositions

Electrically conductive or emissive compositions

Elemental carbon containing

252512, 252514, 252518, 106 105, 264105, H01B 100, H01B 114, H01B 116, H01B 118

Patent

active

055565760

ABSTRACT:
A method is provided for making a spreadable conductive polymeric coating having a positive temperature coefficient of resistivity including the steps of mixing aromatic solvents in a heated vessel, stirring, and heating to a temperature between 40 and 60 degrees Celsius; adding a quantity of substrate-forming elastomer, which contains no diene monomer, equal to 25% to 40%, by weight, of a conductor powder to be added in a later step; adding a quantity of a paraffin equal to 25% to 40%, by weight, by weight, of the conductor powder to be added and continuing to stir until all solids are dissolved; adding a fine conductor powder and continuing to stir until a smooth paste is formed; and mix-kneading the paste until a substantially uniform dispersion of the fine conductor powder in the paste is achieved. The paste, when suitably thinned, can be screen printed or otherwise spread on a wide variety of surfaces and thermally cured to form a thin conductive layer having a PTC of resistivity for use in heating without the need for thermostatic control of the temperature. The pastes can be formulated for a variety of PTCs.

REFERENCES:
patent: 4534889 (1985-08-01), van Konynenburg
patent: 4714569 (1987-12-01), Nishino et al.
patent: 4877554 (1989-10-01), Honma et al.
patent: 4957723 (1990-09-01), Nishino
patent: 5187002 (1993-02-01), Egashira et al.

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