Thixotropic moisture cure urethane adhesive

An adhesive composition comprising

• A) between about 30 and about 99 wt % of a first urethane adhesive component which is a formed from a polyether polyol formed from C.sub.2 -C.sub.4 -alkylene oxide units, said polyether polyol having a weight average molecular weight of between about 400 and about 10000, said polyether polyol being a liquid at least down to about -40.degree. C., said polyether polyol being end-capped with an isocyanate having an isocyanate functionality so as to provide said end-capped polyether polyol with isocyanate functionality beetween about 2.0 and about 3.0,
• B) between about 1 and about 70 wt % of a second urethane adhesive component formed from a polyester diol or polyester diol mixture, said polyester diol or polyester diol mixture comprising
• i) between about 40 and 100 wt % based on total weight of i)-iii) of a polyester formed of diols and dicarboxylic acids or anhydrides thereof, said polyester having a weight average molecular weight of between about 2000 and about 7000, and having a T.sub.g of between about -80.degree. C. and about -20.degree. C.,
• ii) up to about 60 wt % based on total weight of i)-iii) of a polyester formed of diols and dicarboxylic acids or anhydrides thereof, said polyester having a weight average molecular weight of between about 4000 and about 60,000, and a T.sub.g of between about 10.degree. C. and about 50.degree. C.,
• iii) up to about 40 wt % based on total weight of i)-iii) of a polycaprolactone having a weight average molecular weight of between about 1000 and about 3000,
• said polyester or said polyesters of said polyester mixture having hydroxyl functionalities of at least about 2 and being end-capped with an isocyanate of isocyanate functionality so as to provide said second adhesive component B) with an isocyanate functionality of between about 2 and about 2.3, and
• C) between about 1 and about 70 wt % of a third adhesive component which is unreacted isocyanate of isocyanate functionality of between about 2 and about 3,
• said first, second, and third components being provided in amounts proportioned to provide a thixotropic adhesive composition having a Brookfield Viscometer viscosity of between about 150,000 and about 2,000,000 at 20.degree. C., but which has a flowable viscosity under a minimum shear force of 10-30 psi (7.0.times.10.sup.3 -2.1 .times.10.sup.4 kg/m.sup.2).