Partially crystallizing enamel containing crystalline zinc borat

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

1998-02-12

1999-05-04

Pianalto, Bernard

Stock material or miscellaneous articles

Composite

Of quartz or glass

4273762, 428689, 428704, B32B 900

Patent

active

059003197

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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