| abstract |
(57) [Summary] [PROBLEMS] To provide a polyurethane resin having, as a binder resin of a printing ink for a one-pack type laminate, anti-blocking property, anti-boil property and anti-retort property which are contradictory properties at the same time. [Structure] A high-molecular-weight polyol compound having a molecular weight of 3,000 to 10,000, a low-molecular-weight polyol compound having a molecular weight of 200 or less, an organic diisocyanate compound, a chain extender and, if necessary, a reaction terminator are added to the following (a) and (b). And a polyurethane resin obtained by reacting under the conditions of (c). (A) The total average molecular weight of the high molecular weight polyol compound and the low molecular weight polyol compound is 1500 to 270. It is in the range of 0. (B) The isocyanate index (II) of the organic diisocyanate compound with respect to the high molecular weight polyol compound is> 2.0. (C) The nitrogen content derived from the isocyanate group in the polyurethane resin is in the range of 1.30 to 1.95% by weight. |