Daryl L Middleton

US Patent:

52543927, Oct 19, 1993

Filed:

Jun 24, 1991

Appl. No.:

7/720135

Inventors:

Carole G. Burns - Canton MI
Daryl J. Middleton - Riverview MI
James W. Proscia - Dearborn MI

Assignee:

Ford Motor Company - Dearborn MI

International Classification:

B32B 702

US Classification:

428212

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.