C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
31/121, 117/54
C09D 5/03 (2006.01) B05D 5/12 (2006.01) C03C 8/14 (2006.01) C04B 41/45 (2006.01) C04B 41/50 (2006.01) C04B 41/81 (2006.01) C04B 41/87 (2006.01) C23D 5/04 (2006.01)
Patent
CA 2036281
CERAMIC ENGOBES FOR ELECTROSTATIC POWDER APPLICATION AND A PROCESS FOR THEIR PREPARATION ABSTRACT OF THE DISCLOSURE Powders useful in applying a ceramic coating to ceramic substrates by electrostatic powder application are ceramic engobes in powder form, containing molten, ground ceramic frits, ground ceramic raw materials, finely divided minerals, powdered glass, powdered crockery porcelain and inorganic opacifiers for electrostatic powder application to ceramic substrates, and which engobes a surface which has been treated with electrically insulating substances comprising halogen-free polysiloxanes or mixtures thereof which react by their reactive groups on the grain surface of the engobe powders. The ceramic engobes are prepared by treating ceramic materials with from 0.05 to 0.25% by weight of halogen-free polysiloxanes, based on the ceramic in powder form, which was ground, before or during the treatment at a temperature from 70 to 100°C or thermally after- treated at 70 to 300°C following a cold grinding, and the ground powder mixture having a fineness of from 10 to 120µ, a specific electric resistance of from 1013 to 1016 Ohm ? cm, a cubic coefficient of thermal expansion of 120 x 10-7 to 240 x 10-7K-1 determined at 20 to 300°C, and a fluidity of from 50 to 90 g/30 sec. BIT 1
Broggi Giovanni
Zybell Paul
Bayer Italia S.p.a.
Fetherstonhaugh & Co.
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