Patent ID: 8304507
Filing Date: 2012-11-06
Classification: C08G,G02B

Abstract:
1. A polymerizable composition for a polythiourethane optical material, comprising: (A) a polymerization catalyst for a polythiourethane optical material, (B) at least one compound selected from m-xylylene diisocyanate, 2,5-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane, 2,6-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane, 1,3-bis(isocyanatomethyl)cyclohexane, 1,4-bis(isocyanatomethyl)cyclohexane, and hexamethylene diisocyanate, and (C) at least one compound selected from 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, pentaerythritol tetrakis(3-mercaptopropionate), 1,1,3,3-tetrakis(mercaptomethylthio)propane, 1,1,2,2-tetrakis(mercaptomethylthio)ethane, 4,6-bis(mercaptomethylthio)-1,3-dithiane, and 2-(2,2-bis(mercaptodimethylthio)ethyl)-1,3-dithietane, wherein said polymerization catalyst for a polythiourethane optical material (A) comprises (a1) one or two or more kinds of zinc compound selected from the group consisting of zinc dithiocarbamates, zinc sulfonates, zinc salts of mono- or di-alkyl phosphoric acid esters, bis(substituted acetylacetonato) zinc, and zinc halides, (a2) a compound represented by the following general formula (1), and (a3) a sulfonic acid represented by the following general formula (2): wherein R wherein n represents an integer of 1 or 2, and R wherein the molar ratio of the compound (a2) represented by the general formula (1) to the zinc compound (a1) is in the range 0.01 to 100, and the molar ratio of the sulfonic acid (a3) represented by the general formula (1) is in the range 0.01 to 100, wherein the total amount of the zinc compound (a1), the compound (a2) represented by the general formula (1), and the sulfonic acid (a3) represented by the general formula (2) is in the range of 0.0005 parts by weight to 5 parts by weight, based on 100 parts by weight of the total amount of the compound (B) and the compound (C).