Two-component polyurethane adhesive

A low-viscosity two-component filled polyurethane adhesive having a urethane content of from 7 to 20 percent by weight, based on the weight of nonfilled polyurethane polymer, comprising

• (a) a low-viscosity isocyanate component in a quantity sufficient to provide an isocyanate index of about 100 to about 150 comprising an organic polyisocyanate wherein 0 to 10 equivalent percent of the isocyanate groups of said organic polyisocyanate have been modified by reaction with one or more isocyanate-reactive compounds;
• and
• (b) a low-viscosity curative component that is resistant to phase separation comprising
• (i) 5 to 50 equivalent percent, based on the total equivalents of amino and hydroxyl groups of component (b), of an isocyanate-reactive polyether having an equivalent weight greater than 500 selected from the group consisting of polyether polyols, polyethers terminated by aromatic amino groups, and mixtures thereof,
• (ii) 30 to 95 equivalent percent, based on the total equivalents of amino and hydroxyl groups of component (b), of 2-methyl-1,3-propanediol, and
• (iii) 0 to 35 equivalent percent, based on the total equivalents of amino and hydroxyl groups of component (b), of one or more chain extenders and/or crosslinkers other than 2-methyl-1,3-propanediol having a molecular weight in the range 32 to 400, with the proviso that the equivalent ratio of component (b)(iii) to component (b)(ii) is no more than about 0.6,
• wherein at least one of components (a) or (b) contains at least one filler in a quantity of from about 10 to about 40 percent by weight based on the total quantity of filled polyurethane adhesive.