Lead-free and cadmium-free frits

Details Lead-free and cadmium-free frits Lead-free and cadmium-free frits

1980-02-15

1981-08-25

Thomas, Earl C.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 54, C03C 308, C03C 500

Patent

active

042857317

ABSTRACT:
This invention is related to the production of glazes and enamels for decorating glass, glass-ceramic, and ceramic articles. The glass frits suitable therefor exhibit good glass stability, coefficients of thermal expansion (20.degree.-300.degree. C.) between about 65-75.times.10.sup.-7 /.degree.C., demonstrate excellent resistance to attack by acids and bases, and, being essentially free from toxic heavy metals such as lead, are eminently useful in food preparation and service applications. The frit compositions are encompassed within the system Li.sub.2 O--BaO--TiO.sub.2 --ZrO.sub.2 --B.sub.2 O.sub.3 --SiO.sub.2, wherein at least one member of the group consisting of MgO, CaO, ZnO, and Bi.sub.2 O.sub.3, is optionally present. Operable frits are encompassed within the ranges, expressed in weight percent, of:

REFERENCES:
patent: 3716385 (1973-02-01), Ritze
patent: 3902910 (1975-09-01), Hares et al.
patent: 4061584 (1977-12-01), Girard et al.
patent: 4084976 (1978-04-01), Hinton
patent: 4120733 (1978-10-01), Knapp
patent: 4179300 (1979-12-01), Sagara

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