Process for opalizing glass
AssigneeBullseye Glass Co.
InventorsRaymond E. Ahlgren, Danial W. Schwoerer, Boyce H. Lundstrom
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Abstract
This invention relates to the use of AlF.sub.3 as an opacifying agent in an opal glass making batch which contains 40 wt. percent or more of container and sheet glass cullett. The batch consists essentially, in weight percent, of 40-85% cullett, 0-25% Na.sub.2 B.sub.4 O.sub.7.5H.sub.2 O, 0-12% CaMg(CO.sub.3).sub.2, 3-19% SiO.sub.2, and an amount of Alf.sub.3, which is 10-30% of the weight of the cullett.
Claims6
A glass making batch for the production of a spontaneous opal glass containing essentially, in weight percent, of:
- 40-85% of a cullett which, in weight percent, contains about 72% SiO.sub.2, 13% Na.sub.2 O, 12% CaO, and 3% metal oxide selected from the group consisting of aluminum oxides, iron oxides and mixtures thereof;
- 3-19% SiO.sub.2 ;
- and
- an amount of AlF.sub.3 which is 10-30% of the weight of the cullett.
A glass making batch for the production of a spontaneous opal glass consisting essentially, in weight percent, of:
- 4- 85% of a cullet which, in weight percent, contains about 72% SiO.sub.2, 13% Na.sub.2 O, 12% CaO, and 3% metal oxide selected from the group consisting of aluminum oxides, iron oxides and mixtures thereof;
- 3-19% SiO.sub.2 ;
- and
- an amount of AlF.sub.3 sufficient to induce spontaneous opalization of the glass formed from said batch.
Dependencies are inferred from the claim text.