Duplex resistor inks

• US 3,947,278 A
• Filed: 12/19/1973
• Issued: 03/30/1976
• Est. Priority Date: 12/19/1973
• Status: Expired due to Term

• Current Assignee: Universal Oil Products Company (Honeywell International Inc.)
• Original Assignee: Universal Oil Products Company (Honeywell International Inc.)
• Inventors: Youtsey, Karl J.
• Primary Examiner(s): Welcome, Joan E.
• Application Number:
  US05/426,279
• Time in Patent Office: 832 Days
• Field of Search: 106/19-32, 117/221, 117/226, 117/227, 117/106 C, 252/502, 252/506, 252/507, 252/508, 252/510, 252/514, 96/1.5, 260/37 R, 260/37 M, 260/41 A, 260/41 B
• US Class Current: 106/31.68
• CPC Class Codes: C09D 11/02 Printing inks C09D11/30 takes precedence
• CPC Class Codes: H01C 17/06506 Precursor compositions therefor, e.g. pastes, inks, glass frits
• CPC Class Codes: H01C 17/0652 containing carbon or carbides
• CPC Class Codes: Y10S 174/29 having a semiconductive layer

Abstract

Electrical resistor inks comprising a mixture of carbon black and a semi-conducting pyropolymeric inorganic material along with a vehicle consisting of a binder such as a synthetic resin or a varnish and a suitable solvent or oil, etc. are useful in forming resistors in electrical circuits, the resistor ink possessing a temperature coefficient of resistance of less than 500 ppm/° C.

Claims

1. An electrical resistor ink possessing a temperature coefficient of resistance of from about +500 ppm/°

C to about -500 ppm/°

C comprising a resistive component and a vehicle containing a binder of synthetic or natural resin and a solvent, oil or mixtures thereof, said resistive component comprising from about 10% to about 97% of a mixture of carbon black and an alumina or silica-alumina base having a mono-layer of a carbonaceous pyropolymer on the surface thereof, the weight percent of semiconducting pyropolymeric inorganic refractory oxide material in said resistive component being in the range of from about 25% to about 75%, and said vehicle of said resistor ink upon drying providing electrical continuity between the resistive components.

2. The electrical conductor ink as set forth in claim 1 in which said mono-layer is formed on the surface of said base by passing a decomposable organic compound over the base at a temperature of from about 400°

to about 800°

C,

3. The electrical conductor ink as set forth in claim 1 in which said base has a surface area of from 1 to 500 square meters per gram.

4. The electrical resistor ink as set forth in claim 1 in which said vehicle is varnish and isopropyl alcohol.

5. The electrical resistor ink as set forth in claim 1 in which said vehicle is a copolymer of vinyl chloride, vinyl acetate and vinyl alcohol, and methyl isobutyl ketone.

6. The electrical resistor ink as set forth in claim 1 in which said vehicle is an alkyd resin and mineral spirits.

7. The electrical resistor ink as set forth in claim 1 in which said vehicle is shellac and isopropyl alcohol.

8. The electrical resistor ink as set forth in claim 1 in which said vehicle is ethyl cellulose and methyl alcohol.

9. A resistor formed by applying the electrical resistor ink of claim 1 upon a solid surface and drying said ink.

10. The resistor as set forth in claim 9 in which said mixture of said ink is present in an amount of from about 50% to about 90% by weight of said resistor.

11. The electrical conductor ink as set forth in claim 1 in which said base is gamma-alumina.