Amino group terminated toughener and its use in epoxy resin based compositions

摘要

Use of amino group-terminated polyurethane, which is produced by reacting polyurethane prepolymer having isocyanate group, a primary diamine and optionally at least one Michael acceptor, is claimed. The polyurethane prepolymer having isocyanate group is produced from at least one polyisocyanate and at least one polyester or polyether polyol, which has at least two hydroxyl groups. Use of amino group-terminated polyurethane, which is produced by reacting polyurethane prepolymer having isocyanate group, a primary diamine and optionally at least one Michael acceptor, is claimed. The polyurethane prepolymer having isocyanate group is produced from at least one polyisocyanate and at least one polyester or polyether polyol, which has at least two hydroxyl groups. The method includes a condition that when the primary diamine exhibits a molecular weight of less than 600 g/mole, a Michael acceptor is involved as an impact strength modifier in the manufacture of amino group-terminated impact strength modifier. Independent claims are also included for: (1) the amino group terminated impact strength modifier, obtained by the above mentioned method, where the primary diamine in comparison to the polyurethane prepolymer having isocyanate groups is used so that the ratio of isocyanate groups to amino groups is less than 0.5; (2) a two component epoxide resin composition, comprising a component K1 comprising at least one epoxide resin A1 with an average of more than one epoxide group per molecule, a component K2 comprising a hardener-(b) for epoxide resins, and, at least one amino group terminated impact strength modifier in component K2; and (3) bonding substrates comprising mixing two-component epoxide resin composition, applying the composition onto the surface of the substrate S1, preferably a metal, contacting the applied epoxide resin composition with the surface of another substrate S2, preferably a metal, and hardening the epoxide resin composition at a temperature of = 100[deg] C, preferably 10-40[deg] C.