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US 8,795,838 B2Granted
Composite material for optical use and method for obtaining same
AssigneeChristian Dalloz Sunoptics
InventorFranck Montalbano
Life of this patent
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Abstract
A composite material for optical use as well as the method for obtaining it. This material includes a substrate made from a thermoplastic copolyester, a layer of polyurethane bonding primer, and a silicone anti-scratch varnish; advantageously, this varnish has hydroxyl groups, aliphatic CH groups, ester groups, and siloxane groups without methyl groups. This material makes it possible to produce optical pieces, in particular sunglasses, particularly solar glasses, as well as eyeshades for helmets or masks.
Claims9
A composite material for optical use, comprising:
- a. a substrate comprising a thermoplastic cycloaliphatic copolyester of dimethyl terephthalate-1,4-cyclohexanedimethanol-2,2,4,4-tetramethylcyclobutane-1,3-diol;
- b. a layer of polyurethane bonding primer;
- c. a silicone anti-scratch varnish.
Dependencies are inferred from the claim text.