Patent ID: 7056380
Filing Date: 2006-06-06
Classification: C03C

Abstract:
1. A water-based black enamel composition, comprising: 20 to 40% by weight of a member selected from the group consisting of water-soluble sodium silicate, potassium silicate and mixtures thereof; a water-soluble base, in an amount sufficient for the pH of the composition to be at least 10.5; 5 to 25% by weight of water; 40 to 60% by weight of a metal oxide selected from the group consisting of mixtures of chromium oxide(s) and at least one oxide selected from the group consisting of copper oxides, iron oxides and cobalt oxides; less than 10% by weight of zinc oxide; at least 10% by weight of a glass frit having a melting point below 680° C.; and less than 10% by weight of a glass frit having a Littleton point above 700° C.; wherein said composition is capable of being deposited on a glass substrate.