Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1985-05-07
1987-04-14
Cockeram, Herbert S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528 73, C08G 1822, C08G 1838, C08G 1864
Patent
active
046580077
ABSTRACT:
This invention is an improvement in a process by which a polyepoxide and a polyisocyanate are reacted to form an oxazolidone containing polymer or polymer precursor. This improvement comprises conducting said reaction in the presence of a catalytic amount of an organoantimony iodide catalyst. In such improved process, the oxazolidone forming reaction proceeds much more rapidly than the trimerization reaction of the polyisocyanate or the homopolymerization of the polyepoxide. As a result, the product polymer or polymer precursor contains a surprisingly small proportion of isocyanurates. In addition, the overall rate of reaction is substantially increased as compared to that achieved with conventional catalysts, thereby reducing the time and stringency of conditions required to form the desired product.
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Marks Maurice J.
Plepys Raymond A.
Cockeram Herbert S.
Cohn G. C.
The Dow Chemical Company
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