Abrasion and antifog-resistant optical element
AssigneeAmerican Optical Corporation
InventorBernard L. Laurin
Life of this patent
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Abstract
An optical element is provided having a durable abrasion-resistant, antifog coating applied to at least one surface thereof by coating an optical element comprised of an inorganic or organic transparent base with a transparent abrasion-resistant antifog coating consisting of a lightly cross-linked polyvinyl alcohol, the desired degree of cross-linking being obtained by utilizing a combination of zirconium nitrate and formaldehyde as cross-linking agents.
Claims3
An abrasion-resistant optical element comprising a transparent base element of glass or plastic having a transparent, abrasion-resistant, antifogging coating on at least one surface thereof comprising a cross-linked polyvinyl alcohol wherein said polyvinyl alcohol is cross-linked with a curing agent which is composed of 1 to 3 parts by weight of zirconium nitrate and 3 to 1 parts by weight of formaldehyde, said curing agent constituting 0.2 to 0.8 percent by weight, on a solids basis, of the total weight of polyvinyl alcohol and curing agent.
Dependencies are inferred from the claim text.