The invention relates to a thio(meth)acrylic acid bisester of formula I ##STR1## where R.sub.1 represents hydrogen or methyl; r represents the number 0 or 1; and s, m, and n independently represent an integer from 2 to 6, with the proviso that when r=0, s+n>4; and when r=1, s+m+n>6 useful as or monomer for high refractive index plastics.
A cross-linkable polymeric casting composition includes an effective amount of an acrylic or methacrylic di- or polythiol monomer of the formula (1) wherein p is an integer of 0 or 1, M or M' are each spacer groups selected from one or more of the following formulae (i), (ii) wherein m is an integer of 0 or 1 and n is an integer of 0 to 3, with the proviso that m and n are not both equal to zero, R.sup.1 R.sup.2, R.sup.3 and R.sup.4, which may be the same or different, are selected from hydrogen, alkyl or substituted alkyl of 1 to 10 carbon atoms, alkoxy or substituted alkoxy of 1 to 10 carbon atoms, or R.sup.1 or R.sup.2 is (iii) and optionally a polymerisable comonomer. ##STR1##
Disclosed are: (1) an optical resin composition comprising Component A: a thiourethane prepolymer compound prepared by reacting a polythiol compound having at least 3 functional groups and an intramolecular sulfide bond, with a polyisocyanate compound in a molar ratio of --SH to --NCO ranging from 3.0 to 7.0 Component B: at least one (meth)acrylate compound having at least 2 functional groups; and Component C: a compound radically polymerizable with Components A and B, in 10 to 50% by weight, 35 to 70% by weight, and 5 to 30% by weight, respectively; (2) a preparation process for an optical resin by photopolymerization; (3) an optical resin; and (4) a prepolymer suitable for Component A. The composition is a novel, rapidly polymerizable composition for an optical resin. Furthermore, a resin prepared by curing the composition not only has a high refractive index and a high Abbe number, but also is excellent in transparency and optical homogeneity.
Disclosed are (1) an optical resin composition comprising Component A: a thiourethane prepolymer compound prepared by reacting a polythiol compound having at least 3 functional groups and an intramolecular sulfide bond, with a polyisocyanate compound in a molar ratio of --SH to --NCO ranging from 3.0 to 7.0; Component B: at least one (meth) acrylate compound having at least 2 functional groups; and Component C: a compound radically polymerizable with Components A and B, in 10 to 50% by weight, 35 to 70% by weight, and 5 to 30% by weight, respectively; (2) a preparation process for an optical resin by photopolymerization; (3) an optical resin; and (4) a prepolymer suitable for Component A. The composition is a novel, rapidly polymerizable composition for an optical resin. Furthermore, a resin prepared by curing the composition not only has a high refractive index and a high Abbe number, but also is excellent in transparency and optical homogeneity.
A sulfur-containing O-(meth)acrylate compound of the following formula (1) is useful as a starting material for a resin composition used in optical applications such as a lens; wherein R represents hydrogen atom or methyl group; l represents an integer from 1 to 3; B is ##STR1## when B is ##STR2## n is 2; m is 1 or 2; A is selected from the following groups: ##STR3## wherein m represents 1 or 2; each ring may be substituted by one or more alkyl, alkylthio or alkoxy groups having 1 or 2 carbon atoms; p and q are 0 or 1, while m is 1 when p is 1; when B is ##STR4## n is 1; m is 2 or 3; A is selected from the following groups: wherein r and s are an integer from 1 to 3.
A sulfur-containing O-(meth)acrylate compound of the following formula (1) is useful as a starting material for a resin composition used in optical applications such as a lens; ##STR1## wherein R represents hydrogen atom or methyl group; 1 represents an integer from 1 to 3; B is ##STR2## when B is ##STR3## n is 2; m is 1 or 2; A is selected from the following groups: ##STR4## wherein m represents 1 or 2; each ring may be substituted by one or more alkyl, alkylthio or alkoxy groups having 1 or 2 carbon atoms; p and q are 0 or 1, while m is 1 when p is 1; when B is ##STR5## n is 1; m is 2 or 3; A is selected from the following groups: --(CH.sub.2).sub.r --S--(CH.sub.2).sub.r --, --(CH.sub.2).sub.r --S--S--(CH.sub.2).sub.r --, --(CH.sub.2).sub.r --S--(CH.sub.2).sub.s --S--(CH.sub.2).sub.r -- and ##STR6## wherein r and s are an integer from 1 to 3; when B is ##STR7## n is 1; m is 2; A is selected from the following groups: --(CH.sub.2).sub.r --S--(CH.sub.2).sub.r --, --(CH.sub.2).sub.r --S--S--(CH.sub.2).sub.r -- and --(CH.sub.2).sub.r --S--(CH.sub.2).sub.s --S--(CH.sub.2).sub.r -- wherein r and s are an integer from 1 to 3.
