US4695504A
Expired / Lapsed
US
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Thick film resistor composition
Assignee: Panasonic Holdings Corp
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Filing: 1986-06-18
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Granted: 1987-09-22
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Expires: 2006-06-18
Abstract
Abstract A thick film resistor composition, comprising a silicide powder composed of a molybdenum disilicide, a tantalum disilicide and a magnesium silicide, and an alkaline earth borosilicate glass powder dispersed in a vehicle containing a heat-depolymerizing organic polymer. The thick film resistor composition, employing this heat-depolymerizing organic polymer, can be fired in a nonoxidizing atmosphere and coexist with base metal materials such as copper electrodes. Owing to the Nb2O5 and Ta2O5 contained in the alkaline earth borosilicate glass powder, the thick film resistor composition is free from sheet resistivity fluctuation, according to resistor length, which would result from diffusion of the electrode material into the resistor.
Inventors
- 👤 Hirotoshi Watanabe
- 👤 Osamu Makino
- 👤 Toru Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:25
CPC Classifications
H; H01; H01C; H01C7/00; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/0656; H01C17/06573; H01C17/0658; H01C17/06593; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24926
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
81 words
A thick film resistor composition comprising a silicide powder and an alkaline earth borosilicate glass powder dispersed in a vehicle containing an acrylic polymer, said silicide powder being composed of 0-40 mol % of molybdenum disilicide and a 100-60 mol % of a mixture of a tantalum disilicide and a magnesium silicide, the mol ratio of said tantalum disilicide to said magnesium silicide ranging from 9.5:0.5 to 5:5, said alkaline earth borosilicate glass powder containing 8-10 wt % of niobium pentoxide.
Claim 2
Dependent Claim
81 words
A thick film resistor composition comprising a silicide powder and an alkaline earth borosilicate glass powder dispersed in a vehicle containing an acrylic polymer, said silicide powder being composed of 0-40 mol % of molybdenum disilicide and a 100-60 mol % of a mixture of a tantalum disilicide and a magnesium silicide, the mol ratio of said tantalum disilicide to said magnesium silicide ranging from 9.5:0.5 to 5:5, said alkaline earth borosilicate glass powder containing 8-10 wt % of niobium pentoxide.
Claim 3
Dependent Claim
19 words
The thick resistor composition as claimed in claim 1, wherein the silicide powder is composed of a solid solution.
Claim 4
Dependent Claim
22 words
The thick film resistor composition as claimed in claim 1, wherein the silicide powder mean particle size is less than 1 μm.
Claim 5
Dependent Claim
18 words
The thick film resistor composition as claimed in claim 1, wherein said acrylic polymer is an iso-butylmethacrylate resin.
Claim 6
Dependent Claim
32 words
The thick film resistor composition as claimed in claim 1, wherein said heat-depolymerizing acrylic polymer is a copolymer of iso-butyl methacrylate and methyl methacrylate in a ratio ranging from 6:4 to 8:2.
Claim 7
Dependent Claim
31 words
The thick film resistor composition as claimed in claim 1, wherein said alkaline earth borosilicate glass powder contains 1-7 wt % of niobium pentoxide and 1-15 wt % of tantalum pentoxide.
Claim 8
Dependent Claim
60 words
The thick film resistor composition as claimed in claim 1, wherein said alkaline earth borosilicate glass powder comprises 30-50 wt % of at least one of BaO, SrO and CaO, 30-50 wt % of B 2 O 3 , 2-10 wt % of SiO 2 , 0-15 wt % of Al 2 O 3 and 0-5 wt % of MgO.
Claim 9
Dependent Claim
20 words
The thick film resistor composition as claimed in claim 1, wherein the glass powder mean particle size is 2-6 μm.
Claim 10
Dependent Claim
57 words
A thick film resistor composition comprising a silicide powder and an alkaline earth borosilicate glass powder being dispersed in a vehicle containing a acrylic polymer, said silicide powder being composed of 10-90 mol % of cobalt silicide and 90-10 mol % of nickel disilicide, said alkaline earth borosilicate glass powder containing 8-10 wt % of niobium pentoxide.
Claim 11
Dependent Claim
57 words
A thick film resistor composition comprising a silicide powder and an alkaline earth borosilicate glass powder being dispersed in a vehicle containing a acrylic polymer, said silicide powder being composed of 10-90 mol % of cobalt silicide and 90-10 mol % of nickel disilicide, said alkaline earth borosilicate glass powder containing 8-10 wt % of niobium pentoxide.
Claim 12
Dependent Claim
20 words
The thick film resistor composition as claimed in claim 9, wherein the silicide powder is composed of a solid solution.
Claim 13
Dependent Claim
22 words
The thick film resistor composition as claimed in claim 9, wherein the silicide powder mean particle size is less than 1 μm.
Claim 14
Dependent Claim
18 words
The thick film resistor composition as claimed in claim 9, wherein said acrylic polymer is an iso-butylmethacrylate resin.
Claim 15
Dependent Claim
32 words
The thick film resistor composition as claimed in claim 9, wherein said heat-depolymerizing organic polymer is a copolymer of iso-butyl methacrylate and methyl methacrylate in a ratio ranging from 6:4 to 8:2.
Claim 16
Dependent Claim
30 words
The thick film resistor composition as claimed in claim 9, wherein said alkaline earth borosilicate glass contains 1-7 wt % of niobium pentoxide and 1-15 wt % of tantalum pentoxide.
Claim 17
Dependent Claim
50 words
A thick film resistor composition as claimed in claim 9, wherein said alkaline earth borosilicate glass comprises 30-50 wt % of at least one of BaO, srO and CaO, 30-50 wt % of B 2 O 3 , 2-10 wt % of SiO 2 and 0-5 wt % of MgO.
Claim 18
Dependent Claim
20 words
The thick film resistor composition as claimed in claim 9, wherein the glass powder mean particle size is 2-6 μm.
Claim 19
Dependent Claim
47 words
A method of producing a thick film resistor comprising the steps of: forming the thick film resistor composition by mixing and dispersing the powders as claimed in claim 1 or 9; forming a resistor on a ceramic substrate; and firing the formed resistor in a nonoxidizing atmosphere.
Claim 20
Dependent Claim
27 words
The method as claimed in claim 17, wherein the thick film resistor composition is fired in a nonoxidizing atmosphere at a temperature between 850° and 965° C.
Claim 21
Dependent Claim
34 words
A circuit substrate having the thick film resistor formed thereon by the process of claim 17 in such a manner that the resistor is connected with copper electrodes preliminarily provided on the ceramic substrate.
Claim 22
Dependent Claim
18 words
The circuit substrate as claimed in claim 19, wherein an alumina substrate is used as the ceramic substrate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |