Patent ID: 7977446

Claim:
A process for polyurethane synthesis comprising the steps of: (a) providing a catalyst of the formula selected from the group consisting of R 1 a R 2 b R 3 c Sn[CH(OH)R 4 ] d and R 1 a R 2 b R 3 c Sn[C(O)R 4 ] d and mixtures thereof, wherein R 1 , R 2 , and R 3 are independently hydrogen, optionally substituted hydrocarbyl, optionally substituted aryl, halide, silyl, carboxylate, hydroxide, alkoxide, stannoxy or stannyl group, R 4 represents an optionally substituted hydrocarbyl or optionally substituted aryl group; a, b, and c are independently 0, 1, 2, or 3, d is 1 or 2, and a+b+c+d=4; (b) contacting at least one isocyanate with the catalyst of step (a) to form a blend; (c) contacting the blend of step (b) to at least one polyol to form a mixture; (d) exposing the mixture of step (c) to air or a gas comprising oxygen.