 Valve for a gas cylinder or the like |
| I claim: 1. Valve for gas cylinder or the like, comprising: a valve body including a seat an inlet ... |
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| Dynamic double action valve |
| It is the object of this invention to have a valve in which a small angular rotation of the handle ... |
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| Valve assembly and disassembly device |
| Accordingly, one object of this invention is to provide a novel valve assembly and disassembly ... |
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| Gate valve |
| According to the present invention and forming primary objectives thereof, a gate valve is provided ... |
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| Valve for controlling liquid flow |
| We claim: 1. A valve for controlling the fluid flow from an inlet of a closed valve housing to an ... |
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| Solenoid actuator with bleed screw |
| OF THE SHOWN EMBODIMENT Referring to the drawing more particularly by reference numbers, number 10 ... |
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| Photoelectric single handle faucet |
| This invention relates to an interior mechanism for a faucet suitable for basin, bath tub, and ... |
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| Diaphragm stop for sensor-operated, battery-powered flush valve |
| The present invention relates to diaphragm operated toilet room flush valves and in particular to ... |
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| Automatic controlling valve for maintaining the rate of fluid flow at a constant value |
| The valve according to one embodiment of the present invention is an automatic constant-flow fluid ... |
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| Bi-directional flow control system |
| What is claimed as invention is: 1. A bi-directional pipeline pressure control system comprising: a ... |
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Method for the metallization of a luminescent screen
| Details |
Inventors: Pezzulo, Antimo; Patel, Himanshu;
Assignee: Videocolor (Montrouge, FR)
Primary Examiner: Bell; Janyce
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
A method for the metallization of a luminescent screen comprises the following steps: the depositing, in a known way, of a layer of at least one luminophor containing, among others, a binder on a transparent face panel; the depositing, on said layer, of a sub-layer consisting of an aqueous emulsion of a water-insoluble resin, the emulsion being neutral or alkaline and being capable of forming a hydrophobic film; the drying of the sub-layer; the depositing, on said sub-layer, of a coating consisting of an aqueous emulsion of a water-insoluble film-forming resin, said emulsion containing 0.1% to 4.0% by weight of hydrogen peroxide, 0.25% to 2.5% by weight of a water-soluble polymer and 0.1% to 1.0% by weight of colloidal silica, the drying of the coating; the depositing of a metallic layer, and the volatilizing of the binder, the sub-layer and the coating. |
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DETAILED DESCRIPTION What is claimed is: 1.
A method for the metallization of a luminescent screen comprising the following steps: depositing a layer of at least one luminophor containing a binder on a transparent face panel; depositing on said layer a sub-layer consisting of an aqueous emulsion of a water-insoluble resin, the emulsion being neutral or alkaline and being capable of forming a hydrophobic film; drying of the sub-layer; depositing on said sub-layer a coating consisting of an aqueous emulsion of a water-insoluble film-forming resin, and at least hydrogen peroxide and a water-soluble polymer; drying the coating; depositing a metallic layer, and volatilizing the binder contained in the luminophor layer, the sub-layer and the coating.
2.
A method according to claim 1 wherein the aqueous emulsion forming the coating contains at least 0.
1% to 4.
0% by weight of hydrogen peroxide, 0.
25% to 2.
5% by weight of a water-soluble polymer and 0.
1% to 1% by weight of colloidal silica.
3.
A method according to claim 1 wherein the water-insoluble resins are acrylate resin copolymers.
4.
A method according to any of the claims 1 and 2, wherein the water-soluble polymer is chosen from the group consisting of polyvinyl alcohols, the boric acid/polyvinyl alcohol complex compounds, methyl cellulose and hydroxymethyl cellulose.
5.
A method according to any of the claims 1 to 3 wherein the volatilization is achieved by heating the screen in air to a temperature between 350.
degree.
C.
and 500.
degree.
C.
Description:
BACKGROUND OF THE INVENTION 1.
Field of the Invention The present invention concerns a method for the metallization of a luminescent screen.
More particularly, it concerns a method for depositing an organic film, which can be eliminated by heat, on the luminophors of a luminous screen used especially in color television tubes or color display monitors.
2.
Description of the Prior Art As described in the U.
S.
Pat.
No.
3,582,390, one of the commonly used methods for the metallization of a luminophor screen for cathode ray tubes consists in producing, on the surface of the luminophor screen, a volatilizable substrate which can be obtained from an aqueous emulsion of a water-insoluble film-forming resin, depositing a metallic layer on the substrate and then eliminating the substrate by volatilization
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Metal Working 
