C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
C03C 14/00 (2006.01) C03C 3/064 (2006.01) C03C 3/089 (2006.01) C03C 3/11 (2006.01) C03C 4/08 (2006.01)
Patent
CA 2361595
The object of the present invention is colourless inorganic glasses, as well as products manufactured from said glasses. Said glasses are of the type containing copper halides or copper cadmium halides and having a sharp optical absorption cutoff between 370 nm and 425 nm; essentially having the composition below, expressed in cationic percentages: 23-73 % SiO2; 15-45 % B2O3; 0-24 % Al2O3; 0-12 % Li2O; 0-20 % Na2O; 0-12 % K2O; 0.25-5 % CaO+BaO+SrO; 0.125-1 % Cu2O; 0-1 % CdO; 0-5 % ZrO2; with (I) 0.25-2 % Cl+Br; and 0-2 % F; the Cl, Br and F contents being themselves expressed in percentages by weight of the total composition; the weight content of bromine being greater than the weight content of chlorine (Br ~ Cl); with an adequate amount of reducing agent(s) which is (are) advantageously selected from SnO2, As2O3, Sb2O3, and mixtures thereof, in order to have mainly, in said glasses, the copper in the form of cuprous ions (Cu+), and therefore glasses which have neither a red coloration, nor a blue green coloration; and the residual yellow coloration of which is minimised.
L'invention porte sur des verres minéraux incolores et sur des produits en étant faits. Lesdits verres à l'halogénure de cuivre ou de cuivre/cadmium, qui présentent une coupure brutale de l'absorption entre 370 et 425 nm, ont essentiellement la composition suivante en pourcentage de cations: 23-73 % SiO¿2?; 15-45 % B¿2?O¿3?; 0-24 % Al¿2?O¿3?; 0-12 % Li¿2?O; 0-20? % ¿Na¿2?O; 0-12 % K¿2?O; 0,25-5 % CaO+BaO+SrO; 0,125-1 % Cu¿2? O; 0-1 % CdO; 0-5 % ZrO¿2?; avec 0-1,75 % Cl, 0-2 % Br (0,25-2 % Cl+Br); et 0-2 % F; les teneurs en Cl, Br et F étant elles-mêmes exprimées en pourcentage pondéral de la composition totale, et la teneur pondérale du brome étant supérieure à celle du chlore (Br > Cl). Avec une quantité adéquate d'agent(s) réducteur(s) choisi(s) de préférence parmi SnO¿2?, As¿2?O¿3?, Sb¿2?O¿3?, et leurs mélanges, permettant d'avoir principalement dans ledit verre le cuivre sous forme d'ions cuivre positifs (Cu+), on obtient un verre sans coloration rouge ni coloration verte, et avec une coloration résiduelle jaune réduite.
Brocheton Yves
Remy Christophe
Corning S.a.
Gowling Lafleur Henderson Llp
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