Dmc, Inc

Andreas Schriener

Herbert Triptrap

Philip Robert Jackson

Steven Charles Withington

David Shingler

Volker Schelling

Hitherto, glazing defects have arisen during glazing of ceramic substrates with an electrostatically applicable coating powder. This problem is solved by the coating powder CP and the coating method. The electrostatically applicable coating powder CP contains 1 to 50 wt. % of a glass-forming composition A which begins softening at 400 to 750&deg; C. and 99 to 50 wt. % of a glass-forming composition B which begins to soften above 750-1,100&deg; C. Preferably, the coating powder consists of 2.5 to 25 wt. % A, 75 to 97.5 wt. % B and 0 to 20 wt. %, specially 2 to 10 wt. % of thermally or chemically activatable adhesive agents. The coating powder CP is electrostatically applied as a single powder. Alternately, coating can be applied in two layers, wherein the CP powder contains at least 5 wt. % of glass-forming composition A as a lower layer and the powder CP contains at least 50 wt. % of glass-forming composition B as an upper layer.

Electrostatically applicable coating powder and processes therefor

An electrostatically applicable coating powder is provided which contains a first powder which forms a glass layer upon firing, and 0.01 to 1% by weight of a salt of a carboxylic acid. The coating powder is free of organosiloxane and preferably contains a chemically or thermally activatable resin. The invention also provides methods for preparing the coating powder and methods for coating glass, ceramic or metal substrates with the powder.

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Bad Homburg, Germany

Andreas Schriener