Back to results
US 4,049,868 AGranted
Abrasion-resistant optical element
AssigneeAmerican Optical Corporation
InventorsBernard L. Laurin, Don H. Rotenberg, Harry D. Crandon
Life of this patent
Estimating the term…
Abstract
An abrasion-resistant organic optical element comprising a transparent base of a synthetic organic material having an adhering coating of an abrasion-resistant material comprising a polysilicic acid ester of an alcohol containing from 1 to 12 carbon atoms and a partially hydrolyzed vinyl polymer to provide polyvinyl alcohol; the coating being cross-linked with formaldehyde or zirconyl nitrate or mixtures thereof. The abrasion-resistant organic optical elements can comprise sheet material or a lens.
Claims4
An optical element with a transparent, abrasion-resistant surface comprising:
- a transparent base of a synthetic organic polymeric material;
- an adhesion-promoting coating on said transparent base;
- an abrasion-resistant surface coating comprising a cured polysilicic acid ester of an alcohol containing from 1 to 12 carbon atoms, said ester having up to four silicic acid ester groups per silicon atom, a hydrolyzed vinyl polymer, a surface active agent and a cross-linking agent selected from the group consisting of formaldehyde, zirconyl nitrate, and mixtures thereof.
Dependencies are inferred from the claim text.