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Bake-hardenable solution for forming conductive coating

A solution and coating technology, used in circuits, discharge tubes, electrical components, etc., can solve problems such as difficulty in controlling coating thickness

Inactive Publication Date: 2005-12-07
THOMSON CONSUMER ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since many conductive solutions and suspensions are applied by hand, it is difficult to control the thickness of the coating obtained

Method used

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  • Bake-hardenable solution for forming conductive coating
  • Bake-hardenable solution for forming conductive coating
  • Bake-hardenable solution for forming conductive coating

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Component Weight (g) Optimal value (wt.%) Range (wt.%)

[0022] Glass raw material powder 28 34.61 34.15-35.02

[0023] Graphite 9 11.13 10.98-11.26

[0024] Acrylic paint 12 14.83 14.63-15.01

[0025] Solvent 30 37.08 36.58-37.52

[0026] Porosity enhancer 0.9-3.0 2.35 1.19-3.66

[0027] Coatings adhered well with resistance ranging from 320-440Ω / in or 126-173Ω / cm.

[0028] The glass frit powder component includes a bonding medium for the solution. Graphite includes a conductive medium. The acrylic lacquer provides compatibility with the film-forming lacquer under the aluminum layer and acts as a binder for the pre-baked components. Xylene is an organic solvent that forms a carrier for the solid components of the solution. Although xylene is preferred, toluene can be mixed with xylene until a ratio of one part toluene to one part xylene is achieved. The evaporation rate of the solvent was controlled by means of the toluene-xylene ratio. An increase in the am...

example 2

[0030] Example 2 (EG#10)

[0031] Component Weight (g) Concentration (wt.%) Remarks

[0032] Glass frit EG4003 3.5 34.61 resistance is

[0033] Graphite 0.9 10.71 320-600Ω / in or

[0034] Electrodag154 1.0 11.90 126-236Ω / cm. some

[0035] Acrylic paint 1.5 17.86 Sample shows coating

[0036]Toluene 1.5 17.86 with bumps

example 3

[0037] Example 3 (EG#10B)

[0038] Component Weight (g) Concentration (wt.%) Remarks

[0039] The resistance of glass frit EG4003 3.5 39.33 is

[0040] Graphite 0.9 10.11 300-400Ω / in or

[0041] Electrodag154 1.0 11.24 118-157Ω / cm. Good adhesion

[0042] Acrylic paint 1.5 16.85 Good at very

[0043] Toluene 1.0 11.23 Except on thin aluminum

[0044] Xylene 1.0 11.24

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PUM

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Abstract

The present invention relates to a bake-hardenable solution that is electrically conductive, when hardened. The resultant conductive panel coating (38) is utilized for electrically interconnecting a metal stud (27) embedded in a sidewall (20) of a faceplate panel (12) of a CRT (10) to a conductive layer (24) overlying a luminescent screen (22) on an interior viewing surface of the panel. The solution consists essentially of the following ingredients: glass frit powder; graphite; organic binder; solvent; and a material to enhance the porosity of the resultant conductive panel coating.

Description

technical field [0001] The present invention relates to a bake-curable solution which, when cured, forms a conductive panel coating electrically interconnecting at least one metal pin embedded in the sidewall of a cathode ray tube (CRT) panel and an aluminum screen layer , and in particular to solutions which when cured form a conductive panel coating which does not generate particles and has a conductivity of less than 1000 ohms / inch (Ω / in) or 394 ohms / centimeter (Ω / cm) rate, and if the panel needs to be repaired, it can be removed by washing before baking the masking layer. Background technique [0002] US Patent 4,289,800 to Shah (published September 15, 1981) describes a method of providing a conductive bridge between a high voltage operating shadow mask and an aluminum layer covering a CRT phosphor screen. In this patented method, a film-forming lacquer is provided between a rougher phosphor screen and an aluminum layer. The film-forming lacque...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J9/20H01J29/20H01J29/88
CPCH01J29/88H01J29/20
Inventor D·W·巴奇J·F·爱德华斯
Owner THOMSON CONSUMER ELECTRONICS INC