Patent ID: 8304506

Claim:
A polymerizable composition comprising, (A) an alicyclic isocyanate compound represented by following Formula (1) and/or by following Formula (2): (B) at least one polythiol compound optionally having at least one (poly)sulfide bond in a molecule selected from the group consisting of 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, 1,1,3,3-tetrakis(mercaptomethylthio)propane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and (C) at least one compound represented by following Formula (3): HO—[R1-(Y) n ] m —R2-X (3) (in above Formula (3), X is an OH group or a SH group; Y is an oxygen atom; R1 and R2 are each independently an optionally substituted methylene group or an optionally substituted alkylene group having carbon atoms of not smaller than 2 and not larger than 4; n is an integer of 1; and m is an integer of not smaller than 1 and not larger than 3, provided that (carbon number of R1+n)×m+(carbon number of R2) is 3 or larger), wherein the used ratio of said (A) the alicyclic isocyanate compound represented by Formula (1) and/or by Formula (2), said (B) the polythiol compound optionally having at least one (poly)sulfide bond in a molecule, and said (C) the compound represented by Formula (3), is such that the molar ratio of functional groups represented by NCO/(SH+OH) is not less than 0.5 and not more than 3.0, and when given that the number of moles of the hydroxy group and thiol group in said (C) the compound represented by Formula (3) are p and q, respectively, and the number of moles of a thiol group in said (B) the polythiol compound optionally having at least one (poly)sulfide bond in a molecule is r, p/(p+q+r) is not less than 0.001 and not more than 0.40.