PROCESS FOR COATING A LENS OF SYNTHETIC POLYMER WITH A DURABLE ABRASION-RESISTANT EOUS COMPOSITION

摘要

AO-2385 PROCESS FOR COATING A LENS OF SYNTHETIC POLYMER WITH A DURABLE ABRASION RESISTANT VITREOUS COMPOSITION There is disclosed a process for improving the adhesion of an evaporable glass coating on a synthetic polymer lens by the application of a base vitreous coating of a mixture of silicon dioxide and silicon monoxide by evaporating silicon monoxide under vacuum in a oxygen atmosphere so that in addition to silicon monoxide, a silicon dioxide condensate is condensed on the outer surface of the lens. An outer vitreous coating is subsequently applied over said base coating. The evaporative glass outer coating can be formed essentially from boron oxide and silicon dioxide containing less than 5% by weight of sodium oxide. The evaporative glass coating can also be of fused silica, or a boro-silicata glass sold under the trademark "Pyrex".