Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1976-06-04
1977-07-26
McCarthy, Helen M.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
65 30R, 106 49, 106 52, 106 53, 428427, 428428, B32B 702, C03C 502
Patent
active
040384489
ABSTRACT:
This invention relates to the production of a composite article consisting of an opal glass body exhibiting a dense, milky-white appearance coated with an adherent enamel demonstrating high gloss and exceptional chemical durability. More specifically, the opal glasses of the present invention have compositions within the Na.sub.2 O-Al.sub.2 O.sub.3 -SiO.sub.2 -F system and demonstrate a softening point in excess of 760.degree. C., a strain point in excess of 490.degree. C., and a coefficient of thermal expansion (0.degree.-300.degree. C.) of about 66-75 .times. 10.sup..sup.-7 /.degree. C. The enamels of the instant invention have flux compositions within the Li.sub.2 O-B.sub.2 O.sub.3 -TiO.sub.2 -ZrO.sub.2 -PbO-SiO.sub.2 system, will fire to a high gloss in less than about 10 minutes at temperatures below about 720.degree. C., will exhibit coefficients of thermal expansion (25.degree.-300.degree. C.) about 3-10 points lower than the opal glass substrate, will demonstrate lead release after chemical attack of less than about 2 .mu.g/cm.sup.2, and will manifest excellent resistance to dishwasher detergents.
REFERENCES:
patent: 2224469 (1940-12-01), Blau
patent: 3404027 (1968-10-01), Kosiorek
patent: 3510343 (1970-05-01), Twells
patent: 3622359 (1971-11-01), Pither
patent: 3673049 (1972-06-01), Giffen et al.
Stewart, J. A., "Classification of Inorganic Enamels," The Glass Industry, Nov. 1965, pp. 654-656.
Boyd David C.
Cantaloupe Francis A.
Dumbaugh, Jr. William H.
Flannery James E.
Holleran Louis M.
Corning Glass Works
Janes Jr. Clinton S.
McCarthy Helen M.
Patty, Jr. Clarence R.
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