Laminated pane with low energy transmission
AssigneeSaint-Gobain Vitrage
InventorsFranz Kraemling, Helmer Raedisch, Heinz Schilde
Life of this patent
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Abstract
A pane with low energy transmission. The pane has a laminated structure of at least one glass sheet tinted in its mass and preferably having antisolar properties, and at least one sheet of polymer material containing a UV-absorbent, the at least one glass sheet and at least one sheet of polymer material being chosen to give a light transmission factor TL.sub.A of less than 60%, an energy transmission factor TE such that the ratio TL.sub.A /TE is greater than 1 and a transmission factor TUV less than 0.5%, the total thickness of the pane being preferably between 2.5 and 8 mm. The application of the pane, notably, as a lateral pane, rear window pane, roof or sun roof for transportation vehicle is disclosed.
Claims15
A pane having a laminated structure, comprising at least one sheet of tinted glass, and at least one sheet of polymeric material containing a UV-absorbing agent, said at least one sheet of glass and at least one sheet of polymeric material being chosen such that said pane provides a light transmission factor TL.sub.A less than 60%, an energy transmission factor TE such that the ratio TL.sub.A /TE is higher than 1, and an ultraviolet light transmission factor TUV less than 0.5%, the total thickness of the pane being from 2.5 to 8 mm, wherein the tinted glass consists of the following constituents expressed in percentages by weight:
- ______________________________________ SiO.sub.2 64 to 75% Al.sub.2 O.sub.3 0 to 5% B.sub.2 O.sub.3 0 to 5% CaO 2 to 15% Na.sub.2 O 9 to 18% K.sub.2 O 0 to 5% Fe.sub.2 O.sub.3 0.75 to 1.4% (total iron expressed in this form) FeO 0.25 to 0.32% SO.sub.3 0.10 to 0.35% ______________________________________
- and, optionally, less than 0.5% of impurities, or
- ______________________________________ SiO.sub.2 69 to 75% Al.sub.2 O.sub.3 0 to 3% CaO 2 to 10% Na.sub.2 O 9 to 17% K.sub.2 O 0 to 8% Fe.sub.2 O.sub.3 0.2 to 1.5% ______________________________________
- and, optionally, consisting of fluorine, oxides of zinc, zirconium or titanium, and less than 4% of barium oxide, the total of the percentages of alkaline-earth oxides remaining equal to or less than 10%.
A pane having a laminated structure, comprising at least one sheet of tinted glass, and at least one sheet of polymeric material containing a UV-absorbing agent, said at least one sheet of glass and at least one sheet of polymeric material being chosen such that said pane provides a light transmission factor TL.sub.A less than 60%, an energy transmission factor TE such that the ratio TL.sub.A /TE is higher than 1, and an ultraviolet light transmission factor TUV less than 0.5%, the total thickness of the pane being from 2.5 to 8 mm, wherein said tinted glass consists of the following constituents expressed in percentages by weight:
- ______________________________________ SiO.sub.2 64 to 75% Al.sub.2 O.sub.3 0 to 5% B.sub.2 O.sub.3 0 to 5% CaO 2 to 15% Na.sub.2 O 10 to 18% K.sub.2 O 0 to 5% Na.sub.2 O + K.sub.2 O 10 to 20% Fe.sub.2 O.sub.3 1.4 to 4% ______________________________________
- optionally cobalt oxide, chromium oxide or selenium oxide, or mixtures thereof, and wherein the factor TL.sub.A is equal to or less than 20% approximately and TE is equal to or less than approximately 12% and wherein the polymeric material sheet is a sheet of colorless or tinted PVB.
A pane having a laminated structure, comprising at least one sheet of tinted glass, and at least one sheet of polymeric material containing a UV-absorbing agent, said at least one sheet of glass and at least one sheet of polymeric material being chosen such that said pane provides a light transmission factor TL.sub.A less than 60%, an energy transmission factor TE such that the ratio TL.sub.A /TE is higher than 1, and an ultraviolet light transmission factor TUV less than 0.5%, the total thickness of the pane being from 2.5 to 8 mm, wherein said tinted glass consists of the following constituents expressed in percentages by weight:
- ______________________________________ SiO.sub.2 64 to 75% Al.sub.2 O.sub.3 0 to 5% B.sub.2 O.sub.3 0 to 5% CaO 5 to 15% Na.sub.2 O 10 to 18% K.sub.2 O 0 to 5% Fe.sub.2 O.sub.3 0.45 to 2.5% CoO 0.001 to 0.02% Se 0 to 0.0025% Cr.sub.2 O.sub.3 0 to 0.1% ______________________________________
- having a total energy transmission factor TE of from 10 to 48% and a factor TL.sub.A of from 20 to 60% for a thickness of 3.85 mm, the ratio TL.sub.A /TE being greater than 1.
Dependencies are inferred from the claim text.