HIGH PERFORMANCE POLYURETHANE ELASTOMERS FROM MDI PREPOLYMERS WITH REDUCED CONTENT OF FREE MDI MONOMER

摘要

Polyurethane prepolymers having a reduced amount of unreacted monomeric diisocyanate, particularly diphenyl-methane dissocyanate (MDI), prepared by distilling the prepolymer reaction product in the presence of a least one inert solvent whose boiling point is slightly below that of the monomeric diisocyanate; an d to high performance cast polyurethane elastomers from the thus obtained prepolymers using diamine and/or diol chain extenders .