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AssigneeCorning Incorporated
InventorsGerard R. M. Boury, Daniel L. G. Ricoult
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This invention is directed to the production of lead-free enamels containing finely-divided glass particles, finely-divided pigment particles, and an organic binder wherein the glass particles consist essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________ SiO.sub.2 35-50 Li.sub.2 O + Na.sub.2 O + K.sub.2 O <8 B.sub.2 O.sub.3 23-30 CaO 1-5 Al.sub.2 O.sub.3 10-22 CaO + MgO + ZnO + BaO + SrO <7 Li.sub.2 O 1-3 TiO.sub.2 0-2 Na.sub.2 O 0-3 ZrO.sub.2 0-5 K.sub.2 O 2-5 ______________________________________ said glass having a softening temperature T.sub.L above 650.degree. C. and thermal expansion coefficient below 60.times.10.sup.-7 /.degree.C. Among other applications, said glass can be used for the decoration of low-expansion glass-ceramic cooking plates.
A lead-free enamel composition containing finely divided glass particles, finely divided pigment particles, and an organic binder, characterized in that the glass exhibits a coefficient of thermal expansion less than or equal to 60.times.10.sup.-7 /K and a softening temperature T.sub.L above 650.degree. C., and consists essentially, expressed in weight percent based on the oxides, of
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