Patent EP0588136A2 successfully refreshed from Google Patents.
EP0588136A2
Expired / Lapsed
EP
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Polymer thick film resistor compositions
Assignee: EIDP Inc
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Filing: 1993-08-30
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Granted: —
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Expires: 2013-08-30
Abstract
Abstract A polymer thick film resistor composition is disclosed which comprises: (1) finely divided particles of a conductive metal having a surface area of 0.3 to 3.0 m<2>/g; (2) finely divided particulate material having a surface area greater than 100 m<2>/g; (3) a thermoplastic resin; dissolved in (4) an organic solvent having a volatility rating of 10,000 to 50,000; wherein the composition is substantially curable within 2.5 minutes by heating to a temperature of 135C, and further wherein the volume ratio of particulate material to resin is at least 3.5, and the weight ratio of solvent to resin is 3 to 5.
Inventors
- 👤 Jay Robert Dorfman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 16:16
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/003; H01C7/005; G; G03; G03F; G03F7/00; G03F7/004; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24909; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/259
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
88 words
A polymer thick film resistor composition comprising: (1) finely divided conductive metal particles having a surface area of 0.3 to 3.0 m²/g, (2) finely divided material particles having a surface area greater than 100 m²/g, (3) a thermoplastic resin, dissolved in (4) an organic solvent, wherein the composition is substantially curable within 2.5 minutes by heating to a temperature of 135C, and further wherein the volume ratio of particulate material to resin is at least 3.5, and the weight ratio of solvent to resin is 3 to 5.
Claim 2
Dependent Claim
22 words
The composition of claim 1 wherein the conductive metal is selected from the group consisting of silver, gold, copper and mixtures thereof.
Claim 3
Dependent Claim
18 words
The composition of claim 1 wherein the conductive metal has a surface area of 0.7 to 1.3 m²/g.
Claim 4
Dependent Claim
22 words
The composition of claim 1 wherein the particulate material is selected from the group consisting of carbon, silica, alumina and mixtures thereof.
Claim 5
Dependent Claim
17 words
The composition of claim 1 wherein the particulate material has a surface area greater than 200 m²/g.
Claim 6
Dependent Claim
27 words
The composition of claim 1 wherein the thermoplastic resin is selected from the group consisting of phenoxy resin, epoxy resin, vinylidene chloride, polyester. polyurethane and mixtures thereof.
Claim 7
Dependent Claim
15 words
The composition of claim 1 wherein the solvent has a volatility rating greater than 10,000.
Claim 8
Dependent Claim
16 words
The composition of claim 7 wherein the solvent has a volatility rating of 10,000 to 50,000.
Claim 9
Dependent Claim
105 words
The composition of claim 1 suitable for fabricating the resistor element of a voltage indicator comprising: (1) finely divided silver particles having a surface area of 0.3 to 3.0 m²/g. (2) finely divided carbon particles having a surface area greater than 100 m²/g, (3) a phenoxy resin, dissolved in (4) an organic solvent having a volatility rating of 10,000 to 50,000, wherein the composition is substantially curable within 2.5 minutes by heating to a temperature of 135C, and further wherein the volume ratio of carbon to phenoxy resin is at least 3.5, and the weight ratio of solvent to phenoxy resin is 3 to 5.
Claim 10
Dependent Claim
73 words
A polymer thick film resistor composition comprising: (1) finely divided of carbon particles having a surface area greater than 100 m²/g, (2) a thermoplastic resin, dissolved in (3) an organic solvent, wherein the composition is substantially curable within 2.5 minutes by healing to a temperature of 135C, and further wherein the volume ratio of carbon to resin is at least 3.5, and the weight ratio of solvent to resin is 3 to 5.
Claim 11
Dependent Claim
17 words
The composition of claim 10 wherein the carbon particles have a surface area greater than 200 m²/g.
Claim 12
Dependent Claim
27 words
The composition of claim 11 wherein the thermoplastic resin is selected from the group consisting of phenoxy resin, epoxy resin, vinylidene chloride, polyester, polyurethane and mixtures thereof.
Claim 13
Dependent Claim
15 words
The composition of claim 10 wherein the solvent has a volatility rating greater than 10,000.
Claim 14
Dependent Claim
16 words
The composition of claim 13 wherein the solvent has a volatility rating of 10,000 to 50,000.
Claim 15
Dependent Claim
37 words
A resistive element comprising a substrate having printed thereon a layer of the composition of claim 1, said layer having been heated to effect removal of the solvent and conversion of the composition to the solid state.
Claim 16
Dependent Claim
37 words
A resistive element comprising a substrate having printed thereon a layer of the composition of claim 10, said layer having been heated to effect removal of the solvent and conversion of the composition to the solid state.
References Cited (Backward Citations)
No citation records indexed.
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