| 摘要 |
<p>Polyurethane prepolymers having a reduced amount of unreacted monomeric diisocyanate, particularly diphenylmethane 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; and to high performance cast polyurethane elastomers from the thus obtained prepolymers using diamine and/or diol chain extenders.</p> |
