structural polyurethane adhesive having low glass transition temperature

摘要

Polyurethane adhesive comprises: a first component comprising (a) at least one triol with a molecular weight of 1000-10000 g/mole, (b) at least one diol with two primary hydroxyl groups and a molecular weight of 60-150 g/mole, and (c) at least one aliphatic polyamine having a molecular weight of 60-500 g/mole; a second component comprising (d) at least one polyisocyanate and (e) at least one isocyanate polyurethane polymer; and additional polyurethane adhesive comprising (f) at least one catalyst in the form of a metal chelate complex, in which metal is e.g. iron(III) and hafnium(IV). Polyurethane adhesive comprises: a first component comprising (a) at least one triol with a molecular weight of 1000-10000 g/mole, (b) at least one diol with two primary hydroxyl groups and a molecular weight of 60-150 g/mole, and (c) at least one aliphatic polyamine having a molecular weight of 60-500 g/mole; a second component comprising (d) at least one polyisocyanate and (e) at least one isocyanate polyurethane polymer; and additional polyurethane adhesive comprising (f) at least one catalyst in the form of a metal chelate complex, in which the metal is iron(III), titanium(IV), zirconium(IV) and hafnium(IV). The triol, diol and polyamine are present in an amount such that the ratio of the number of hydroxy groups and amino groups of (diol and polyamine) to triol is 3-15, and the ratio of the number of hydroxy groups and amino groups of diol to polyamine is 2-30. Independent claims are also included for: (1) bonding a first substrate to a second substrate, comprising mixing the two components of the polyurethane adhesive, applying the mixed polyurethane adhesive to at least one of the substrate surfaces to be bonded, joining the substrates to be bonded within the open time, and curing the polyurethane adhesive; and (2) an article produced from the above mentioned method.