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US 6,271,328 B1Granted
Liquid, polymerizable composition yielding optical articles showing a high refractive index
OwnerFranco Rivetti, Fiorenzo Renzi +1inventors
InventorsFranco Rivetti, Fiorenzo Renzi, Ugo Romano
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Abstract
A liquid composition, polymerizable by means of a free-radical route to yield optical articles endowed with a high refractive index, contains an allyl-carbonate derivative definable with the general formula: (wherein R1, X1, X2, X3, X4, X5, X6, a and b are as defined in the disclosure) and a copolymerizable monomer containing at least one ethylenic unsaturation in its molecule.
Claims20
Liquid compositions, polymerizable by a free-radical route to yield optical articles possessing a high refractive index, comprising:
- (a) from 20 to 80 percent by weight of an allyl-carbonate derivative represented by the formula
- wherein:
- R1 is selected from the group consisting of a hydrogen atom, a linear (C1-C6)-alkyl radical, a branched (C1-C6)-alkyl radical, a phenyl radical and a benzyl radical;
- X1, X2, X3, X4, X5, and X6 are independent from each other, and are selected from the group consisting of a hydrogen atom, a chlorine atom and a bromine atom;
- and
- a and b are independent of each other, and are integers of from 0 to 3;
- (b) from 80 to 20 percent by weight of a copolymerizable monomer having at least one ethylenic unsaturation in its molecule.
4 more elements
Dependencies are inferred from the claim text.