Glass manufacturing – Processes – With coating
Patent
1982-09-20
1983-08-09
Morgenstern, Norman
Glass manufacturing
Processes
With coating
427190, 427255, 427314, 427168, 427180, 427226, 427421, 427427, 427424, C03C 17245
Patent
active
043976719
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method of placing a metallic oxide film on a surface of a heated glass substrate. In particular, the method has been developed for placing such a metal oxide film on a heated glass substrate as that glass substrate is being moved in a selected direction from a glass manufacturing process. The inventive process is one in which a spray powder is formed from organic based metal salts which are heat decomposable. The spray powder is pyrolyzed when it is sprayed against the surface of the heated glass substrate so that the organic based metal salts are decomposed to form the metal oxide film on the surface of the glass substrate.
BACKGROUND ART AND PRIOR ART STATEMENT
I personally conducted an extensive search on the subject matter of this specification in the U.S. Patent Office. I uncovered several patents which deal with the pyrolytic application of metal oxide films on the surface of a heated glass substrate which will be discussed hereinbelow. These patents seemed to indicate that no particular controls were required in order to generate a metal oxide film on the surface of a heated glass substrate which would have desirable physical and chemical properties when used, for example, as an architectural glazing. The patents seemed to indicate further that no matter how one went about such a coating process, one would be successful.
In doing research work on pyrolytic coating with spray powder compositions, I learned that certain key parameters must be met in order to develop on the surface of the glass substrate a metal oxide film which would have chemical and physical durabilities necessary if that coated substrate is to be successfully used, for example, in an architectural glazing.
The patents that I uncovered that appear to be of interest are set forth individually hereinbelow.
U.S. Pat. No. 3,081,200, in column 3, line 13, shows that the patentee has sprayed both solutions and powders in order to form pyrolytic metal oxide coatings. The patent examples, however, are directed to solutions of coating materials and no specific instructions are contained in the patent with respect to how one successfully accomplishes the application of powders to form a pyrolytic metal oxide film on a glass substrate. This would lead one to believe that any sort of method would be successful. I have found that the methodology employed to develop such a film on a glass substrate does have to be controlled, as will be discussed in greater detail hereinbelow.
German Pat. Nos. 2,529,076; 2,529,077 and 2,529,079 deal with the development of metal oxide film on a glass substrate.
In the '076 patent, metal salt particles are charged prior to application to a glass substrate which has been preheated to a temperature in the range of from 500.degree. to 650.degree. C. The patent indicates that heat decomposable, organic based metal salts may be used and that a preheated carrier gas may be used for transporting the particles to the glass substrate. The patent teaches that the particles should be charged and distributed in a 90.degree. downwardly directed attitude towards the glass substrate from a gas distributor which extends transverse to the direction of travel of the glass substrate passing therebelow. This patent teaches an electrostatic charging of the particles in order to develop a coated metal oxide film on the glass substrate along with a relatively low velocity discharge of the particles in a direction perpendicular to the glass substrate. I have found in my work that it is not necessary to charge the particles and one should not discharge the particles at a relatively low velocity in a direction perpendicular to the surface of the glass substrate which is to have the metal oxide film developed thereon.
German Pat. No. 2,529,077 discloses a process for forming a metal oxide film on a glass substrate by pyrolytic techniques. The starting material is a powder metal compound which is carried by an inert carrier gas into a cyclone where the smallest particles of the compound are sep
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Bell Janyce A.
Ford Motor Company
Johnson Olin B.
Johnson William E.
Morgenstern Norman
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