Polymerization regulators and compositions for resin

(Amended) A composition for resin comprising an episulfide compound having, in one molecule, at least one epithio structure represented by the following Formula 2:

• 17
• wherein R5 is C1-C10 hydrocarbylene or single bond, R6, R7 and R8 are each independently C1-C10 hydrocarbyl or hydrogen, Y is O, S, Se or Te, p is an integer from 1 to 5, and q is an integer from 0 to 5, and at least one of a polymerization regulator represented by the following Formula 1:
• 18
• wherein R1, R2 and R3 are each C1-C10 hydrocarbyl or hydrogen;
• R4 is C1-C10 hydrocarbylene or single bond;
• X is F, Cl, Br, I, As, SH, OH, C1-C10 alkoxyl, C1-C10 alkylthio, or C1-C10 mercaptoalkylthio;
• and m is an integer from 1 to 5, and a halide of a 13-16 group element of the long periodic table.

(Amended) A method for producing a resin for optical material, which comprises a step of polymerizing an episulfide compound having, in one molecule, at least one epithio structure represented by the following Formula 2:

• 19
• wherein R5 is C1-C10 hydrocarbylene or single bond, R6, R7 and R8 are each independently C1-C10 hydrocarbyl or hydrogen, Y is O, S, Se or Te, p is an integer from 1 to 5, and q is an integer from 0 to 5, in the presence of a halide of a 13-16 group element of the long periodic table and/or a polymerization regulator represented by the following Formula 1:
• 20
• wherein R1, R2 and R3 are each C1-C10 hydrocarbyl or hydrogen;
• R4 is C1-C10 hydrocarbylene or single bond;
• X is F, Cl, Br, I, As, SH, OH, C1-C10 alkoxyl, C1-C10 alkylthio, or C1-C10 mercaptoalkylthio;
• and m is an integer from 1 to 5.