Central Glass Company, Limited

Kazuo Ueda

Yoshio Abe

Toshiyuki Kanno

Hajime Inoue

Yoshio Horio

Hiroshi Morimoto

A method of forming a colored and/or electrically conductive coating layer on a glass sheet by applying a paint containing an inorganic pigment and/or a metal powder together with a powdered glass frit and an organic liquid binder onto the glass sheet, by screen-printing for instance, so as to form a paint layer on the glass sheet surface, rendering the paint layer hard and untacky and thereafter firing the paint-applied glass sheet so as to melt the glass frit contained in the paint. The organic liquid binder comprises at least one acrylate which is selected from monofunctional acrylates and bifunctional acrylates and is polymerizable by radiation of ultraviolet rays. Hardening of the paint layer is accomplished by ultraviolet radiation of very short duration, and the polymerized acrylate can be completely burnt out at the firing step without leaving unburnt carbon which is detrimental to the coating layer.

Method of forming colored or conductive coating layer on glass sheet

A method of coloring a glass sheet which must contain reducing ions such as tin ions diffused into a surface layer thereof. The reducing ions may originate in a molten metal bath used in producing the glass sheet by the float process. A coloring agent comprising a powder mixture of 1 part by weight of a substance expressed by Ag.sub.x W.sub.y O.sub.z, wherein x:y:z is 1-2:1:2-4, and 5 to 20 parts by weight of a transition metal oxide, e.g. Cr.sub.2 O.sub.3, is applied to the glass sheet surface, and the glass sheet is heated so as to cause silver ions to diffuse into the surface layer of the glass sheet and undergo reduction by the action of the precedingly diffused ions to produce color. Conveniently, use is made of a paste prepared by dispersing the powder mixture in an organic liquid vehicle. Owing to the stability of the silver-containing oxide Ag.sub.x W.sub.y O.sub.z, uniform coloring is achieved without encountering difficulty and without degrading the quality of the glass sheet.

Method of coloring glass sheet by diffusion and reduction of silver ions

A method of producing a curved glass sheet having a colored coating layer formed in a selected region, such as a marginal region in the case of a window glass for the rear window of an automobile, by applying a coloring agent comprising inorganic pigment and glass frit of a low melting temperature onto a flat glass sheet surface, heating the glass sheet and press-bending the heat-softened glass sheet while the applied coloring agent is in fused state. As a novel feature, the coloring agent comprises alumina powder which adheres to the surfaces of the glass frit particles until fusion of the glass frit on the glass sheet surface. The presence of alumina powder prevents a shaping tool pressed against the glass sheet from adhering to the fused layer of the coloring agent.

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Matsusaka, Japan

Kazuo Ueda