| abstract |
A linear polyurethane polymer containing phenolic hydroxyl functionality for reaction with a thermosetting resins comprising a linear polyurethane of recurring units containing linear ester or ether moieties or a combination of ester and ether moieties which are interbonded through urethane groups and uriedo bonded phenolic hydroxyl-containing terminal groups. The linear polyurethane polymer has formula (I) wherein a and b are each 1, 2 or 3, n is at least 1, each X is a divalent organic radical containing at least two carbon atoms in which the N are bonded to different carbon atoms of X, R is an aliphatic polyester or polyalkylene oxide wherein the aliphatic polyester is a polyester of an alkylene diol and an aliphatic carboxylic acid, or a polycaprolactone polyol, and the alkylene group of the polyalkylene oxide contains on average greater than three carbon atoms and not greater than five carbon atoms, and R° is an organic aromatic containing group in which the OH and N bonded to the R° group are bonded directly to different carbon atoms and the OH is bonded directly to an aromatic containing carbon atom. Adhesives, adhesive films, and thermosetting compositions are described. |