Resistive composition

Patent metadata

Field	Value
Publication number	US-9805839-B2
Application number	US-201515119637-A
Country	US
Kind code	B2
Filing date	Aug 20, 2015
Priority date	Sep 12, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

An object of the present invention is to provide a resistive composition that can form a thick film resistor excluding a toxic lead component from a conductive component and glass and having characteristics equivalent to or superior to conventional resistors in terms of, in a wide resistance range, resistance values, TCR characteristics, current noise characteristics, withstand voltage characteristics and the like. The resistive composition of the present invention includes: ruthenium-based conductive particles including ruthenium dioxide; a glass frit that is essentially free of a lead component; and an organic vehicle, wherein the glass frit is a glass frit which is constituted such that in a case where a fired product of a mixture of the glass frit and the ruthenium dioxide has in a range of 1 kΩ/□ to 1 MΩ/□, the fired product exhibits a temperature coefficient of resistance in a plus range.

First claim

The invention claimed is:

1. A resistive composition comprising: ruthenium-based conductive particles including ruthenium dioxide; a glass frit that is essentially free of a lead component; an organic vehicle and a functional filler, wherein the glass frit is a glass frit which is constituted such that in a case where a fired product of a mixture of the glass frit and the ruthenium dioxide has a value in a range of 1 kΩ/□ to 1 MΩ/□, the fired product exhibits a temperature coefficient of resistance in a plus range and wherein the functional filler is composite particles comprising glass particles which are essentially free of a lead component and conducting particles which have a smaller particle size than the glass particles and are essentially free of a lead component.

2. The resistive composition according to claim 1 , wherein the glass frit comprises, in terms of oxide, 20 to 45 mol % of BaO, 20 to 45 mol % of B 2 O 3 , and 25 to 55 mol % of SiO 2 .

3. The resistive composition according to claim 1 , wherein the ruthenium-based conductive particles have an average particle size D 50 of 0.01 to 0.2 μm.

4. The resistive composition according to claim 1 , wherein the glass particles have a glass transition point Tg′ satisfying a relationship of Tg<Tg′ with respect to a glass transition point Tg of the glass frit.

5. The resistive composition according to claim 4 , wherein the Tg is in a range of 450° C. to 700° C. and the Tg′ is 500° C. or more.

6. The resistive composition according to claim 1 , wherein the functional filler contains the conducting particles in an amount of 20 to 35 percent by mass.

7. The resistive composition according to claim 1 , wherein the conducting particles are ruthenium-based conducting particles containing ruthenium dioxide.

8. The resistive composition according to claim 1 , wherein the conducting particles have an average particle size D 50 of 0.01 to 0.2 μm.

9. The resistive composition according to claim 1 , wherein the functional filler has an average particle size D 50 of 0.5 to 5 μm.

10. A resistive composition set comprising a combination of two or more resistive compositions described in claim 1 , wherein the resistive compositions have different weight amounts of the ruthenium-based conductive particles and glass frit.

Assignees

• Shoei Chemical Ind Co

Inventors

• Mashima Hiroshi
• Morofuji Yukari

Classifications

• H01C7/003 Primary

  Thick film resistors · CPC title

• C03C8/10

  containing lead · CPC title

• C03C2214/04

  Particles; Flakes · CPC title

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• C09D5/24

  Electrically-conducting paints {(conductive materials H01B1/00)} · CPC title