C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
C03C 17/36 (2006.01) B32B 15/04 (2006.01) G02B 1/10 (2006.01) G02B 5/20 (2006.01)
Patent
CA 2211420
A coated substrate for use in a glazing panel or optical filter to impart solar screening properties thereto while avoiding an aesthetically unattractive purple colour in reflection is provided by the presence on the substrate of a stack of coating layers comprising (i) a layer of dielectric material, (ii) a layer of a metal selected from silver, gold, copper and alloys of one or more thereof, and (iii) a further layer of dielectric material, characterised in that the layer (i) of dielectric material is a composite layer which includes a sub-layer of a selectively absorbent material with a refractive index of at least 1.4, a spectral absorption index k.lambda. of at least 0.4 in the range 380 < .lambda. < 450 nm and presenting a ratio k380 < .lambda. < 450 nm/k650 < .lambda. < 760 nm > 2.
Depauw Jean-Michel
Novis Yvan
Glaverbel
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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