Anti-iridescence coatings

Details Anti-iridescence coatings Anti-iridescence coatings

C - Chemistry, Metallurgy

23

C

C23C 28/04 (2006.01) C03C 17/23 (2006.01) C03C 17/34 (2006.01) C03C 17/42 (2006.01) G02B 1/10 (2006.01) G02B 5/28 (2006.01)

Patent

CA 2068570

ABSTRACT OF THE DISCLOSURE A glazing article comprises a substrate bearing a substantially transparent coating comprising an optically functional topcoat and a thinner anti-iridescence layer undercoat mediate the topcoat and the substrate. The anti-iridescence layer eliminates or substantially reduces iridescence and, in addition, is readily designed to make the overall coating either colorless or to provide a substantially uniform muted color. The anti- iridescence layer comprises a first thickness zone in which the refractive index is higher than that of the substrate. A low refractive index zone is positioned directly on the high refractive index zone. A second high refractive index zone is positioned on the low refractive index zone, such that the low refractive index zone is directly sandwiched between the two high refractive index zones. A fourth zone, a low refractive index zone, follows the second high refractive index zone. Anti-iridescence is provided for a wide variety of optically functional topcoats without significant impairment of the optical performance thereof. Certain preferred embodiments are particularly well adapted for low emissivity glazing for architectural applications. -42-

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