Anti-iridescence coatings

Details Anti-iridescence coatings Anti-iridescence coatings

1991-06-24

1993-10-19

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

427108, 427109, 4271263, 427166, 427167, 427255, 4272553, 428 34, 428428, 428432, 428699, 428701, 428702, B32B 702

Patent

active

052543927

ABSTRACT:
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.

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