Patent ID: 7671163

Claim:
A process, comprising: a) providing a bivalent, monomeric tin compound of the formula: wherein each R 1 and R 2 are each a sterically hindering group independently selected from the group consisting of heteroaryl, phenyl, substituted phenyl, polyaromatic, fused aromatic systems, heteroaromatic, phosphines, tert-butyldimethylsilyl, di-tert-butyl-phosphino, di-tert-butyl-thiophosphino, di-tert-butyl-phosphoryl, di-tert-butyl-iminophosphino, tert-butyl-amino, tert-butyl-thio, tert-butyl-seleno, tert-butoxy, and di-tert-butyl-boronyl; each R 3 is independently a group that enables solubility of the compound; and b) combining said compound with one or more isocyanate-reactive groups and one or more compounds comprising an isocyanate group to form a polyurethane.