Partially crystallizing enamel containing crystalline zinc borat

Details Partially crystallizing enamel containing crystalline zinc borat Partially crystallizing enamel containing crystalline zinc borat

1997-06-16

1998-05-19

Group, Karl

Coating processes

With post-treatment of coating or coating material

Heating or drying

65 334, 65 336, 501 10, 501 17, C03B 3202

Patent

active

057536856

ABSTRACT:
A ceramic enamel composition is described which contains a zinc-containing oxide frit, a zinc borate seed material, a pigment, and a vehicle. The zinc borate seed material is preferably crystalline in nature, and promotes crystal growth upon firing. A preferred crystalline zinc borate seed material is selected from the phases Zn.sub.3 B.sub.2 O.sub.6 and Zn(BO.sub.2).sub.2, and mixtures thereof. Upon firing and press-forming a glass substrate coated with the enamel, components of the enamel adhere to the substrate while reducing sticking of the coated region to the forming die. The ceramic enamel is particularly useful in providing a colored border around the periphery of automotive glass and is effective in improving appearance and reducing degradation of underlying adhesives by ultraviolet radiation.

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