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Antiglare Coating for CRT Faceplates

IP.com Disclosure Number: IPCOM000082826D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Anschel, M: AUTHOR [+2]

Abstract

This glass formulation is compatible with the processing parameters of high-lead content cathode-ray tube (CRT) bulbs. The coating is resistant to common cleaning solutions and solvents, and provides effective anti-glare functions without destroying the resolution of the CRT image.

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Antiglare Coating for CRT Faceplates

This glass formulation is compatible with the processing parameters of high- lead content cathode-ray tube (CRT) bulbs. The coating is resistant to common cleaning solutions and solvents, and provides effective anti-glare functions without destroying the resolution of the CRT image.

An example of this formulation is as follows: Two grams of a metal oxide mixture previously ground and passed through a 200 mesh sieve composed of lead oxide 80%, boric oxide 10%, germanium dioxide 8.5%, bismuth oxide 0.5%, and lithium oxide 1.0%, all by weight, was mixed with a 30 ml solution of 0.1% decafluorohexylmethacrylate, dissolved in 1,1,2-trichloro 1,2,2-trifluoroethane. The mixture is sprayed onto a precleaned substrate, giving an 0.4 mil thick coating and placed into a furnace. In the case of a CRT, the substrate would be the CRT faceplate.

In one example, the furnace was brought up to 450 degrees over a one-half hour period and maintained for 30 minutes. The furnace was let cool at a rate of Approximately 5 degrees C/min to prevent stress in the final product. The reflow temperature of the resulting glass coating was 421 degrees C.

The fluorinated methacrylate resin (decafluorohexylmethacrylate) binder used in the subject coating has the following advantages: a) High solubility in 1,1,2- trichloric-1,2,2-trifluoroethane, a low-boiling solvent. b) Upon completion of the firing cycle no residue remains. c) Gaseous bubble formation does n...