Glasses made of pink borosilicates, their manufacture, and articles made of such glasses
AssigneeCorning Incorporated
InventorPaul L. Netter
Life of this patent
Estimating the term…
Abstract
This invention is directed to the production of borosilicate glasses displaying a pink coloration and a chromaticity at a thickness of 4 mm with Illuminant C within the ranges of: x=0.3115-0.4200 y=0.3170-0.3600 Y=15-92% The glasses consist essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________ SiO.sub.2 65-85 B.sub.2 O.sub.3 <20 Na.sub.2 O 0-8 K.sub.2 O 0-8 Na.sub.2 O + K.sub.2 O 2-8 Al.sub.2 O.sub.3 1-6 MnO.sub.2 0.05-1. ______________________________________
Claims4
A borosilicate glass of a pink color consisting essentially, in weight percent based on the oxides, of 65-85% SiO.sub.2, more than 10% but less than 20% B.sub.2 O.sub.3, 0-8% Na.sub.2 O,0-8% K.sub.2 O, a total proportion of Na.sub.2 O and K.sub.2 O of 2-8%, 1-6% Al.sub.2 O.sub.3, and 0.05-1.00% manganese calculated as MnO.sub.2, said glass having a linear coefficient of thermal expansion between 20.degree. and 300.degree. C. of between 30 and 55 X 10.sup.-7 /C, and wherein said glass has a degree of oxidation such that it exhibits a chromaticity, at a thickness of 4 mm and for the Illuminant C, within the following ranges:
- x=0.3115 to 0.4200
- y=0.3170 to 0.3600
- z=15 to 92%.
A glass article exhibiting a ink color consisting essentially of a borosilicate glass consisting essentially, in weight percent based on the oxides, of 65-85% SiO.sub.2, more than 10% but less than 20% B.sub.2 O.sub.3,0-8% Na.sub.2 O, 0-8% K.sub.2 O, a total proportion of Na.sub.2 O and K.sub.2 O of 2-8%, 1-6%Al.sub.2 O.sub.3, and 0.05-1,00% manganese calculated as MnO.sub.2, said glass having a linear coefficient of thermal expansion between 20.degree. and 300.degree. C. of between 30 and 55 X 10.sup.-7 /C, and wherein said glass has a degree of oxidation such that it exhibits a chromaticity, at a thickness of 4 mm and for the Illuminant C, within the following ranges:
- x=0.3115 to 0.4200
- y=0.3170 to 0.3600
- z=15 to 92%.
Dependencies are inferred from the claim text.