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AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsMasanori Shimuta, Toru Takahashi, Hisato Abe, Kenichi Takahashi, Akira Kurata, Osamu Aoki
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The present invention provides a composition comprising, as the essential components, an aromatic compound represented by the following general formula ##STR1## (m is an integer of 2-3, n is an integer of 1-3 and R is a hydrocarbon group of 3-6 carbon atoms or a hydrocarbon group of 3-6 carbon atoms containing a bivalent sulfur atom), an isocyanate compound and a radical polymerization initiator. Said composition is useful for producing a plastic lens having a high refractive index, a small specific gravity, excellent heat resistance and excellent processability.
A composition for a high refractive index lens, comprising an aromatic compound represented by the following general formula (1) ##STR4## m is an integer of 2-3, n is an integer of 1-3 and R is a hydrocarbon group of 3-6 carbon atoms or a hydrocarbon group of 3-6 carbon atoms containing a bivalent sulfur atom, an isocyanate compound and a radical polymerization initiator, wherein the aromatic compound and the isocyanate compound are in amounts such that the ratio of moles of hydroxyl group to moles of isocyanate group in the composition is 0.5:1 to 5:1.
A composition for a high refractive index lens, comprising an aromatic compound represented by the following general formula (1) ##STR6## m is an integer of 2-3, n is an integer of 1 and R is an alkyl hydrocarbon group of 3-6 carbon atoms or an alkyl hydrocarbon group of 3-6 carbon atoms containing a bivalent sulfur atom, an isocyanate compound and a radical polymerization initiator, wherein the aromatic compound and the isocyanate compound are in amounts such that the ratio of moles of hydroxyl group to moles of isocyanate group in the composition is 0.5:1 to 5:1.
Dependencies are inferred from the claim text.