Glass compositions
AssigneeCookson Group PLC
InventorsJohn F. Clifford, Ivan Wozniak, Peter J. Smith
Life of this patent
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Abstract
A glass composition which is essentially free from lead and cadium comprises, in mole percent, SiO.sub.2 :35 to 75%, Bi.sub.2 O3:0.1 to 15%, Al.sub.2 O.sub.3 :0.1 to 10%, B.sub.2 O.sub.3 :1 to 30%, at least one of Li.sub.2 O, Na.sub.2 O, K.sub.2 O:5 to 30%, ZrO.sub.2 :0.1 to 10%, and certain other optional ingredients, with the proviso that BaO and ZnO are not contained in an amount of more than 2 mole percent. These glass compositions can be used as fluxes for mixing with pigments to provide compositions for the decoration of ceramic materials and/or glass.
Claims19
An on-glaze glass flux composition suitable for coating onto a glazed surface which is essentially free from lead and cadmium and which consists of the following components:
- ______________________________________ Mole Percent ______________________________________ SiO.sub.2 45-70 Bi.sub.2 O.sub.3 0.5-4 Al.sub.2 O.sub.3 0.1-10 B.sub.2 O.sub.3 1-30 lanthanoid oxide 0-20 at least one of 5-30 (in total) Li.sub.2 O, Na.sub.2 O, K.sub.2 O one or more of 0-10 (in total) ZnO, MgO, CaO, SrO, BaO ZrO.sub.2 0.1-10 TiO.sub.2 0-5 WO.sub.3 0-5 MoO.sub.3 0-5 one or more 0-10 (in total) of Y.sub.2 O.sub.3, HfO.sub.2, Nb.sub.2 O.sub.5, SnO.sub.2 ______________________________________
- with the proviso that ZnO and BaO are each not contained in an amount of more than 2 mole percent.
Dependencies are inferred from the claim text.