Isocyanurate-free oxazolidone compound made from epoxy and a hin

Details Isocyanurate-free oxazolidone compound made from epoxy and a hin Isocyanurate-free oxazolidone compound made from epoxy and a hin

1990-12-18

1992-08-11

Welsh, Maurice J.

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...

525452, 526221, 526270, 526311, 528 59, 528 73, 548231, C08G 1822

Patent

active

051380161

ABSTRACT:
Significant improvements in the utility of oxazolidone and polyoxazolidone compounds and in their manufacture can be achieved using a novel catalyst in the reaction between a hindered isocyanate and an epoxy, forming oxazolidone ring structures. The novel catalyst of the invention promotes the efficient and rapid formation of oxazolidone and polyoxazolidone compounds. The use of hindered isocyanate in the reaction prevents formation of side reaction products such as isocyanate trimer, allophanate and biuret.

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Sandler, "Preparation of Mono and Poly-2-Oxazolidones from 1-2 Epoxides and Isocyanates," Journal of Polymer Science: Part A-1, vol. 5, pp. 1481-1485 (1967).
Dileone, "Synthesis of Poly-2-Oxazolidone from Diisocyanates and Diepoxides," Journal of Polymer Science: Part A-1, vol. 8, pp. 609-615 (1970).
Herweh, et al., "2-Oxazolidones Via the Lithium Bromide Catalyzed Reaction of Isocyanates with Epoxides in Hydrocarbon Solvents," Tetrahedron Letters, No. 12, pp. 809-812 (1971).
Sehovic, et al., "Poly-2-Oxazolidone Urethane Coatings," Journal of Coatings Technology, vol. 59, pp. 29-35 (1987).

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