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AssigneeTokuyama Soda Kabushiki Kaisha
InventorsYasuji Kida, Kazuo Shikata
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A cured resin consisting substantially of a first polymer unit derived from an unsaturated compound having two terminal vinyl groups consisting of bis(alkyleneoxyphenyl)-diacrylates or dimethacrylates, bis(alkyleneoxyphenyl)diallyl ethers, and bis(alkyleneoxyphenyl)diallyl carbonates, and a second polymer unit derived from another unsaturated compound radical-polymerizable with the first-mentioned unsaturated compound, said polymer units being bonded to each other at random. The aforesaid cured resin can be producted by copolymerizing an intimate mixture consisting substantially of at least one compound selected from the first-mentioned unsaturated compounds having two terminal vinyl groups and prepolymers thereof and at least one compound selected from other unsaturated compounds radical-copolymerizable with the first-mentioned unsaturated compounds and prepolymers thereof in the presence of a radical polymerization initiator. A lens composed of the aforesaid cured resin has a high refractive index, excellent transparency and excellent fire retardancy.
A cured resin consisting substantially of a first polymer unit derived from an unsaturated compound having two terminal vinyl groups represented by the following general formula ##STR10## wherein R.sup.1 is hydrogen or methyl, R.sup.2 is ##STR11## each of said groups being bonded to Z by its bond located on the left hand side on the sheet surface, Z represents --CO--, --CH.sub.2 --, or --CH.sub.2 OCO--, each of said groups being bonded by its bond located on the left hand side on the sheet surface to the carbon atom to which R.sup.1 is bonded, X is halogen, Y is --O--, --SO.sub.2 --, ##STR12## l is 0 or 1, m and n, independently from each other, are an integer of 1 to 4, and a and b, independently from each other, are integers of 1 to 4, and a second polymer unit derived from another unsaturated compound radical-polymerizable with the first-mentioned unsaturated compound, said polymer units being bonded to each other at random.
A process for producing a cured resin, which comprises copolymerizing an intimate mixture consisting essentially of at least one compound selected from unsaturated compounds having two terminal vinyl groups represented by the following formula ##STR16## wherein R.sup.1 is hydrogen or methyl, R.sup.2 is ##STR17## each of said groups being bonded to Z by its bond located on the left hand side on the sheet surface, Z represents --CO--, --CH.sub.2 --, or --CH.sub.2 OCO--, each of said groups being bonded by its bond located on the left hand side on the sheet surface to the carbon atom to which R.sup.1 is bonded, X is halogen, Y is --O--, --SO.sub.2 --, ##STR18## l is 0 or 1, m and n, independently from each other, are an integer of 1 to 4, and a and b, independently from each other, are integers of 1 to 4, and prepolymers thereof, and at least one compound selected from other unsaturated compounds radical-polymerizable with the first-mentioned unsaturated compounds and prepolymers thereof, in the presence of a radical polymerization initiator.
Dependencies are inferred from the claim text.