Patent ID: 7932327
Filing Date: 2011-04-26
Classification: C08G,G02B

Abstract:
1. A process for producing a polyurethane/thiourethane-based resin by polymerizing a composition comprising a polyisocyanate component; (B) at least one polythiol compound optionally having at least one (poly)sulfide bond in a molecule; and (C) at least one polyol compound having at least one ether bond and two or more hydroxy groups in a molecule; wherein the polyisocyanate component of said composition consists of the following component (A): (A) at least one polyisocyanate compound selected from the group consisting of an alicyclic isocyanate compound represented by the following Formula (1) or Formula (2): hexamethylene diisocyanate, and dicyclohexylmethane diisocyanate; and wherein said (C) the polyol compound having at least one ether bond and two or more hydroxy groups in a molecule is at least one kind selected from the group consisting of following (D), (E), (F), and (G): (D) diethylene glycol or triethylene glycol; (E) polyol having an average molecular weight of 200 or larger and 2,000 or smaller, which is obtained by a chain extension of the terminal by reacting a compound represented by following Formula (3) with ethylene oxide and/or propylene oxide: (in the above Formula (3), R1 is an ethylene group or a propylene group); (F) polyol having an average molecular weight of 180 or larger and 1,000 or smaller, which is obtained by a chain extension of the terminal by reacting a compound represented by following Formula (4) with ethylene oxide and/or propylene oxide: (in the above formula (4), n is 0 or 1, and R2 is a hydrogen atom, a methyl group, an ethyl group, or a hydroxyl group); and (G) polyol having an average molecular weight of 840 or larger and 1,530 or smaller, which is obtained by a chain extension of the terminal by reacting sorbitol with ethylene oxide and/or propylene oxide; wherein the process comprises adding said component (B) and said component (C) to said component (A), and heat-polymerizing the obtained mixture in the presence of a catalyst; and wherein the used ratio of said (A) the polyisocyanate compound, said (B) the polythiol compound optionally having at least one (poly)sulfide bond in a molecule and said (C) the polyol compound having at least one ether bond and two or more hydroxy groups in a molecule, 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 a hydroxy group in said (C) the polyol compound having at least one ether bond and two or more hydroxy groups in a molecule is p, 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+r) is not less than 0.001 and not more than 0.40.