HIGH PERFORMANCE POLYURETHANE ELASTOMERS FROM MDI PREPOLYMERS WITH REDUCED CONTENT OF FREE MDI MONOMER
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United States of America Patent
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app pub date -
Nov 21, 2008
filing date -
Nov 30, 1999
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Abstract
Polyurethane prepolymers having a reduced amount of unreacted monomeric diisocyanate, particularly diphenylmethane diisocyanate (MDI), prepared by distilling the prepolymer reaction product in the presence of at 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.
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