Title: Abrasion-resistant optical element

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.

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Inventors: Laurin, Bernard L. (Ludlow, MA, US)
Rotenberg, Don H. (Westboro, MA, US)
Crandon, Harry D. (Woodstock, CT, US)

Application Number: 644710
Filing Date: 1975-12-29
Publication_date: 1977-09-20
Assignee: American Optical Corporation (Southbridge, MA)
Primary Class(es): 428/412 428/446, 428/447, 428/451, 428/452
Other Classes:
US Patent Ref:

3652379	Mar, 1972	White et al.	428/412.
3953115	Apr, 1976	French et al.	428/412.
3971872	Jul, 1976	Le Boeuf	428/412.

Other Refs:
Primary Examiner: Hoffman, James R.
Assistant Examiner:
Attorney: Spencer; Alan H., Nealon; William C., Berkenstock, Jr.; H. R.