Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1973-07-05
1976-04-27
Smith, Ronald H.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
260 465UA, 350175NG, 427 40, 427164, 427341, 427175NG, 427379, 427387, 428412, 428447, G02C 702, B32B 2728
Patent
active
039531155
ABSTRACT:
A process is disclosed for applying an adherent, optically clear, abrasion resistant coating to plastic ophthalmic substrates such as plastic lenses. The process includes: (a) forming a partially hydrolyzed solution of a vinyltri(lower alkoxy)silane, such as vinyltriethoxysilane, in a water-miscible, volatile, organic solvent, the silane being present from 25-75% by weight; (b) applying a thin, uniform coating of the partially hydrolyzed solution to a clean surface of the ophthalmic lens; (c) maintaining the coated substrate in a high humidity and preferably elevated temperature environment until the silane is substantially completely hydrolyzed; and, (d) dehydrating the coated substrate under low humidity conditions at an elevated temperature below the temperature at which the substrate degrades until an adherent, abrasion resistant coating is formed. Plastic lenses and other ophthalmic plastic components coated according to the above process are also described.
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patent: 3258382 (1966-06-01), Vincent
patent: 3278476 (1966-10-01), Santelli
patent: 3367910 (1968-02-01), Newing
patent: 3389114 (1968-06-01), Burzynski et al.
patent: 3427273 (1969-02-01), Newing
patent: 3451838 (1969-06-01), Burzynski et al.
patent: 3458342 (1969-07-01), Cormia
patent: 3637416 (1972-01-01), Misch et al.
patent: 3650808 (1972-03-01), Gognon
patent: 3713880 (1973-01-01), Krekeler
French Hollis E.
Kruse Jurgen M.
Blair Homer O.
Brook David E.
Itek Corporation
Nathans Robert L.
Schmidt William H.
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