Halogen-containing lens material.

摘要

A lens material having a refractive index n<Sup>20</Sup><Sub>D</Sub> of at least 1.57 and an Abbe's number v of at least 30, comprising: a copolymer comprising (I) 10 to 85% by weight of a halogen-containing monomer represented by the following formula (1), (II) 15to 90% by weight of a halogen-containing monomer represented by the following formula (2), and (III) 0 to 20% by weight of a monomer copolymerizable with the above mentioned monomers, the composition of the copolymer being based on the total quantity of the monomers (I), (II), and (III):
<Chemistry id="chema01" num="0001"><Image id="ia01" he="20" wi="77" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein: D represents
<Chemistry id="chema02" num="0002"><Image id="ia02" he="21" wi="67" file="IMGA0002.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>in which n represents an integer selected from the group consisting of 0, 1 and 2; each R' represents hydrogen or a methyl group; Y represents CHOH; and r represents 0 or 1; each of X' and X<Sup>2</Sup> represents, independently from each other, a methyl group in which one through three of the hydrogen atoms are substituted by a member selected from the group consisting of bromine, iodine and a hydroxyl group (OH group), with the proviso that the number of substitution of the OH group is only one; X<Sup>3</Sup> represents a methyl group in which one through three of the hydrogen atoms are substituted by a member selected from the group consisting of bromine, iodine and D, with the proviso that the number of substitution of D is only one; wherein at least one of X', X<Sup>2</Sup>, and X<Sup>3</Sup> contains at least one bromine or iodine;<!-- EPO <DP n="2"> --><Chemistry id="chema03" num="0003"><Image id="ia03" he="24" wi="86" file="IMGA0003.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein: each R<Sup>2</Sup> represents hydrogen or a methyl group: p represents an integer selected from the group consisting of 0. 1. 2. and 3; X<Sup>4</Sup> represents bromine or iodine; and q represents an integer selected from the group consisting of 1, 2.3.4. and 5.

An example of the copolymer is 1-methacryloxy-2,2-di (bromomethyl)-3-bromopropane. methacryloxypolyethyoxy-2.4.6- tribromobenzene styrene divinylbenzene having a n<Sup>20</Sup><Sub>D</Sub> of 1.596 and a v of 3<Sub>5</Sub>.3.