C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
49/77, 49/82
C03C 17/02 (2006.01) C03C 3/072 (2006.01) C03C 15/00 (2006.01) C03C 15/02 (2006.01)
Patent
CA 1333524
This invention is directed to a method for making a soda lime glass article having at least one surface which is essentially defect free and having a smoothness at least equivalent to that of a polished surface. The method generally comprises the steps of: (a) bringing together a body of a soda lime glass and a body of a glass consisting essentially, by weight, of 0.75-7.5% Li2O and/or 18-27% PbO, the total Li2O+PbO not exceeding 32%, 35-50% BaO, 0-5% A12O3, 30-50% B2O3, and 5-10% SiO2, said glass having a softening point between 575°-650°C, a coefficient of thermal expansion compatible with soda lime glass, and being at least 100 times more soluble in a particular solvent than soda lime glass, at a temperature wherein at least said more soluble glass is in fluid form to produce a laminate having an interface between the glass bodies which is essentially defect free; (b) cooling said laminate; and thereafter (c) contacting the laminate with an acid solution to dissolve away said more soluble glass.
608959
Coppola Frank
Dumbaugh William Henry Jr.
Ryszytiwskyj William Paul
Corning Incorporated
Gowling Lafleur Henderson Llp
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