Patent ID: 9322957
Filing Date: 2016-04-26
CPC Classification: C08G,C08K,G02B

Claim Text:
1. A method for producing an optical material comprising a compound (a), a compound (b), a compound (c), a compound (d) and a compound (e) described below as raw materials, comprising: (i): dissolving the compound (b) in the compound (a) to obtain a first solution; (ii): adding the compound (e) to the first solution obtained in (i) and then mixing to obtain a second solution not comprising the compound (d); (iii): adding the compound (c) to the second solution obtained in (ii) to react 10 to 70% of the compound (c) with the compound (e) to obtain a reaction mixture; (iv): adding the compound (d) to the reaction mixture obtained in (iii) and then mixing to obtain a resin composition for an optical material; (v): cast-molding the resin composition for an optical material obtained in (iv) and then polymerizing to obtain the optical material; the compound (a): a compound having the structure represented by the following formula (1): wherein m represents an integer from 0 to 4, and n represents an integer from 0 to 2; the compound (b): sulfur; the compound (c): at least one compound selected from m-xylylene diisocyanate, p-xylylene diisocyanate, m-tetramethyl xylylene diisocyanate, p-tetramethyl xylylene diisocyanate, 1,3-bis(isocyanate methyl)cyclohexane, 1,4-bis(isocyanate methyl)cyclohexane, bis(isocyanate methyl)norbornene and 2,5-diisocyanatemethyl-1,4-dithiane; the compound (d): at least one compound selected from bis(2-mercaptoethyl)sulfide, 2,5-bis(2-mercaptoethyl)-1,4-dithiane, 1,3-bis(mercaptomethyl)benzene, 1,4-bis(mercaptomethyl)benzene, 1,2-bis(2-mercaptoethylthio)-3-mercaptopropane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and 1,1,3,3-tetrakis(mercaptomethylthio)propane; the compound (e): at least one compound selected from pentaerythritol tetrakis-mercaptopropionate, pentaerythritol tetrakis-thioglycolate, trimethylolpropane tris(2-mercapto acetate) and trimethylolpropane tris(3-mercapto propionate).