Colored glass compositions and automotive vision panels with...

C - Chemistry – Metallurgy – 03 – C

Patent

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C03C 3/087 (2006.01) C03C 1/10 (2006.01) C03C 4/02 (2006.01) C03C 4/08 (2006.01) G01J 3/46 (2006.01)

Patent

CA 2374613

A neutral gray colored glass composition for automobile vision panels having reduced transmitted color shift characteristics is provided. The glass composition has a base portion including 65 to 75 weight percent SiO2, 10 to 20 weight percent of Na2O, 5 to 15 weight percent CaO, 0 to 5 weight percent MgO, 0 to 5 weight percent Al2O3, and 0 to 5 weight percent K2O. The composition also includes major colorants including 0.30 to 0.70 weight percent Fe2O3, 0 to 15 ppm CoO, and 1 to 15 ppm Se. The glass has a luminous transmittance of at least 65 percent at a thickness of 3.9 mm, a redox ratio of 0.2 to 0.675, a TSET of less than or equal to 65 percent, and a standard color shift of less than 6.

L'invention concerne une composition de verre de couleur gris neutre pour panneaux de visibilité d'automobile, présentant des caractéristiques de décalage de couleur transmise réduites. Ladite composition de verre possède une partie base comprenant 65 à 75 % en poids de SiO¿2?, 10 à 20 % en poids de Na¿2?O, 5 à 15 % en poids de CaO, 0 à 5 % en poids de MgO, 0 à 5 % en poids de Al2O3, et 0 à 5 % en poids de K¿2?O. Cette composition comprend également des colorants principaux comprenant 0,30 à 0,70 % en poids de Fe¿2?O¿3?, 0 à 15 ppm de CoO, et 1 à 15 ppm de Se. Le verre possède un facteur de transmission lumineuse d'au moins 65 % à une épaisseur de 3,9 mm, un rapport d'oxydoréduction de 0,2 à 0.675, une transmission totale d'énergie solaire (TSET) inférieure ou égale à 65 %, et un décalage de couleur standard inférieur à 6.

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