Patent ID: 8394920

Claim:
A method for producing a composition for a resin, comprising: mixing an (a) inorganic compound having a sulfur atom and/or a selenium atom and a (b) compound represented by the following formula (1): (a represents an integer of 0 to 4, and b represents an integer of 0 to 2); and performing a preliminary polymerization reaction of the obtained mixture for 1 minute to 72 hours at 0° C. to 150° C.; and mixing the preliminarily polymerized mixture and a (c) compound represented by the following formula (2): (c represents 0 or 1, d represents 0 or 1, e represents an integer of 1 to 10, and R represents H, SH, CH 2 SH or an aromatic ring), wherein the (a) compound is contained in an amount of 1 to 50 parts by weight when the (a) compound and the (b) compound have a total amount of 100 parts by weight, the (b) compound is contained in an amount of 50 to 99 parts by weight when the (a) compound and the (b) compound have a total amount of 100 parts by weight, and the (c) compound is contained in an amount of 1 to 50 parts by weight when the (a) compound and the (b) compound have a total amount of 100 parts by weight.