US5248916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chlorinated silane and alkoxysilane coatings for cathode ray tubes
Assignee: Zenith Electronics LLC
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Filing: 1991-10-02
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Granted: 1993-09-28
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Expires: 2011-10-02
Abstract
Abstract The present invention is directed to a cathode ray tube (CRT) having a surface with improved antistatic and antiglare properties and to a method for providing such improved properties. In the method of the invention, a solution of a silane selected from a chlorinated silane and an alkoxysilane in a solvent system of on alcohol and chloride ion is provided. The solution is applied to the surface of a cathode ray tube to impart antiglare and antistatic properties to the surface. Thereafter, the CRT with the silane applied is cured at an elevated temperature for a period of time sufficient to cause the silane to react and be converted to a siloxane.
Inventors
- 👤 Hua-Sou Tong
- 👤 Gregory Prando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:02
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/28; C03C17/30; H; H01; H01J; H01J29/00; H01J29/86; H01J29/867; H01J29/868; H01J2229/00; H01J2229/89; H01J2229/8913; H01J2229/8915
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
125 words
A method for improving the antistatic and antiglare properties of the surface of a cathode ray tube comprising: (a) providing a solution consisting essentially of a silane selected from the group consisting of chlorinated silanes and alkoxysilanes and an alcohol, (b) spraying droplets of said solution onto the surface of a cathode ray tube, and (c) curing said silane in the presence of chloride ion provided by said solution on said cathode ray tube in a curing step for a period of time sufficient to convert said silane to siloxane on the surface of said cathode ray tube, said chloride ion being present in said solution at a level of from about 0.01 to about 1.3 mols of chloride ion per 100 grams of solution.
Claim 2
Independent Claim
125 words
A method for improving the antistatic and antiglare properties of the surface of a cathode ray tube comprising: (a) providing a solution consisting essentially of a silane selected from the group consisting of chlorinated silanes and alkoxysilanes and an alcohol, (b) spraying droplets of said solution onto the surface of a cathode ray tube, and (c) curing said silane in the presence of chloride ion provided by said solution on said cathode ray tube in a curing step for a period of time sufficient to convert said silane to siloxane on the surface of said cathode ray tube, said chloride ion being present in said solution at a level of from about 0.01 to about 1.3 mols of chloride ion per 100 grams of solution.
Claim 3
Dependent Claim
23 words
A method in accordance with claim 1 wherein said surface of said cathode ray tube is preheated prior to application of said solution.
Claim 4
Dependent Claim
34 words
A method in accordance with claim 2 wherein said cathode ray tube is preheated to a temperature in the range of from about 70° C. to about 120° C. prior to applying said solution.
Claim 5
Dependent Claim
39 words
A method in accordance with claim 1 wherein said curing of said cathode ray tube is at an elevated temperature of from ambient to about 20020 C. for a period of from about 0.1 hour to about 2 hours.
Claim 6
Dependent Claim
42 words
A method in accordance with claim 1 wherein said silane is present on the surface of said cathode ray tube at a level of from about 0.3 to 1.2 milligrams per square centimeter of said surface area of said cathode ray tube.
Claim 7
Dependent Claim
23 words
A method in accordance with claim 1 wherein said solution is applied by spraying a fine mist of said solution onto said surface.
Claim 8
Dependent Claim
24 words
A method in accordance with claim 1 wherein said solution is applied to said surface of said cathode ray tube by multiple spray passes.
Claim 9
Dependent Claim
20 words
A method in accordance with claim 7 wherein from 3 to 12 spray passes are used to apply said solution.
Claim 10
Dependent Claim
34 words
A method in accordance with claim 1 wherein said silane is present in said solution at a level of from about 0.5 percent to about 50 percent, based on the weight of said solution.
Claim 11
Dependent Claim
12 words
A method in accordance with claim 1 wherein said silane is tetraethoxysilane.
Claim 12
Dependent Claim
23 words
A method in accordance with claim 1 wherein said silane is tetrachlorosilane and said chloride ion is provided by decomposition of said silane.
Claim 13
Dependent Claim
36 words
A method in accordance with claim 1 wherein hydrochloric acid is present in said solution at a level sufficient to provide form about 0.01 to about 1.3 mols of chloride ion per 100 grams of solution.
Claim 14
Dependent Claim
18 words
A method in accordance with claim 1 wherein said alcohol is a C 1 -C 4 aliphatic alcohol.
Claim 15
Dependent Claim
12 words
A method in accordance with claim 13 wherein said alcohol is ethanol.
Claim 16
Dependent Claim
12 words
A method in accordance with claim 13 wherein said alcohol is propanol.
Claim 17
Dependent Claim
22 words
A method in accordance with claim 1 wherein said solution droplets have a diameter of from about 0.3 to about 0.5 microns.
Claim 18
Dependent Claim
59 words
A method in accordance with claim 1 wherein said silane is tetrachlorosilane which is present in said solution at a level of from about 0.5% to about 50%, based on the weight of said solution, and hydrochloric acid is present at a level of from about 1% to about 15% and said alcohol provides the balance of said solution.
Claim 19
Dependent Claim
133 words
A cathode ray tube having a surface with reduced gloss and improved antistatic properties comprising a cathode ray tube having a coating on the surface thereof, said coating being provided by spraying fine droplets of a solution consisting essentially of a silane selected from the group consisting of chlorinated silane and an alkoxysilane and an alcohol onto the surface of said CRT and curing the silane for a period of time sufficient to covert said silane in the presence of chloride ion provided by said solution to a siloxane coating on the surface of said cathode ray tube, said siloxane coating having a uniform, fine texture, said chloride ion being present in said solution at a level of from about 0.1 to about 1.3 mols of chloride ion per 100 grams of solution.
Claim 20
Dependent Claim
133 words
A cathode ray tube having a surface with reduced gloss and improved antistatic properties comprising a cathode ray tube having a coating on the surface thereof, said coating being provided by spraying fine droplets of a solution consisting essentially of a silane selected from the group consisting of chlorinated silane and an alkoxysilane and an alcohol onto the surface of said CRT and curing the silane for a period of time sufficient to covert said silane in the presence of chloride ion provided by said solution to a siloxane coating on the surface of said cathode ray tube, said siloxane coating having a uniform, fine texture, said chloride ion being present in said solution at a level of from about 0.1 to about 1.3 mols of chloride ion per 100 grams of solution.
Claim 21
Dependent Claim
25 words
A cathode ray tube in accordance with claim 18 wherein said surface of said cathode ray tube is preheated prior to application of said solution.
Claim 22
Dependent Claim
36 words
A cathode ray tube in accordance with claim 18 wherein said cathode ray tube is preheated to a temperature in the range of from about 70° C. to about 120° C. prior to applying said solution.
Claim 23
Dependent Claim
41 words
A cathode ray tube in accordance with claim 18 wherein said curing of said cathode ray tube is at an elevated temperature of rom ambient to about 200° C. for a period of from about 0.1 hour to about 2 hours.
Claim 24
Dependent Claim
45 words
A cathode ray tube in accordance with claim 18 wherein said silane is present on the surface of said cathode ray tube at a level of from about 0.3 to about 1.2 milligrams per square centimeter of said surface area of said cathode ray tube.
Claim 25
Dependent Claim
25 words
A cathode ray tube in accordance with claim 18 wherein said solution is applied by spraying a fine mist of said solution onto said surface.
Claim 26
Dependent Claim
26 words
A cathode ray tube in accordance with claim 18 wherein said solution is applied to said surface of said cathode ray tube by multiple spray passes.
Claim 27
Dependent Claim
22 words
A cathode ray tube in accordance with claim 24 wherein from 3 to 12 spray passes are used to apply said solution.
Claim 28
Dependent Claim
34 words
A cathode ray tube in accordance with claim 18 wherein said silane is present in said solution at a level of from about 0.5% to about 50%, based on the weight of said solution.
Claim 29
Dependent Claim
14 words
A cathode ray tube in accordance with claim 18 wherein said silane is tetraethoxysilane.
Claim 30
Dependent Claim
25 words
A cathode ray tube in accordance with claim 18 wherein said silane is tetrachlorosilane and said chloride ion is provided by decomposition of said silane.
Claim 31
Dependent Claim
38 words
A cathode ray tube in accordance with claim 18 wherein hydrochloric acid is present in said solution at a level sufficient to provide from about 0.01 to about 1.3 mols of chloride ion per 100 grams of solution.
Claim 32
Dependent Claim
20 words
A cathode ray tube in accordance with claim 18 wherein said alcohol is a Cp 1 -C 4 aliphatic alcohol.
Claim 33
Dependent Claim
14 words
A cathode ray tube in accordance with claim 30 wherein said alcohol is ethanol.
Claim 34
Dependent Claim
14 words
A cathode ray tube in accordance with claim 30 wherein said alcohol is propanol.
Claim 35
Dependent Claim
24 words
A cathode ray tube in accordance with claim 18 wherein said solution droplets have a diameter of from about 0.3 to about 0.5 microns.
Claim 36
Dependent Claim
61 words
A cathode ray tube in accordance with claim 18 wherein said silane is tetrachlorosilane which is present in said solution at a level of from about 0.5% to about 50%, based on the weight of said solution, and hydrochloric acid is present at a level of from about 1% to about 15% and said alcohol provides the balance of said solution.
References Cited (Backward Citations)
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