A two-component polyurethane adhesive is described. The polyurethane adhesive has high strength and extensibility, wherein the mechanical properties are only slightly dependent on the temperature. The polyurethane adhesive is suitable as a structural adhesive that is decomposed by heating in such a way that adhesive bonds can be undone in a temperature range of interest. The adhesive can include a triol, a diol, an alkoxylated aromatic diol, a polyamine, a polyisocyanate, and a polyurethane polymer having isocayanate groups in certain ratios.

A resin dispersion liquid for inkjet ink contains: a polyurethane resin having a constituent unit derived from (A) polyisocyanate, a constituent unit derived from (B) polyol, and a constituent unit derived from (C) polyamine; and water. The (B) polyol includes (B1) polyether polyol and (B2) diol compound having a carboxy group and/or a carboxylate group. The (C) polyamine includes (C1) first polyamine having two groups selected from an amino group, an imino group, and a hydrazide group, and (C2) second polyamine having three or four groups selected from an amino group, an imino group, and a hydrazide group.