Use of prolonged tack toners for the preparation of electric circuits
AssigneeE. I. Du Pont de Nemours and Company
InventorsGrant A. Beske, Abraham B. Cohen, Roger O. Uhler
Life of this patent
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Abstract
Preparation of an electrically conductive pattern by adhering a prolonged tack toner which is activated by heating to the toner-receptive image areas of an inert substrate, the temperature is reduced and to the activated toner is applied a prolonged tack toner having conductive metal particles and glass frit as components; optionally the steps of heating, temperature reduction and toner application are repeated at least one time, and then the toned image is burned and fired. An electrically conductive pattern is obtained which is useful, for example, as an electric circuit. The process is also useful in the application of resistor and dielectric materials.
Claims16
Process for the preparation of an electrically conductive pattern on an inert substrate comprising
- (a) applying a particulate prolonged tack toner comprising an organic polymer and solid plasticizer to an image of the pattern on the inert substrate, said image having toner-receptive and background areas,
- (b) heating the toned image to a temperature sufficient to activate the toner by rendering the toner tacky,
- (c) reducing the temperature of the heated image below the activating temperature of the prolonged tack toner wherein the activated prolonged tack toner remains tacky,
- (d) applying prolonged tack toner comprising organic polymer, solid plasticizer, conductive particles and glass frit to the tackified toned image,
- (e) optionally repeating steps (b) through (d) at least one time,
- (f) burning off the organic polymer and plasticizer components of the prolonged tack toner by increasing the temperature of the inert substrate and toned image, and
- (g) firing the inert substrate and toned image to a temperature sufficient to fuse the glass frit and sinter the conductive particles.
Dependencies are inferred from the claim text.