American Cyanamid Company

Allan M Feldman

Steven L Trenbeath

Robert W Novak

Peter S Forgione

Laurence John Nummy

Tertiary aliphatic diisocyanate carbodiimide oligomers useful in the formulation of light stable urethane spray coatings prepared by catalytic conversion of diisocyanate monomers such as tetramethylxylylene diisocyanates and dipentene diisocyanate.

Carbodiimide oligomers of tertiary aliphatic isocyanates

Stable isocyanic acid compositions containing isocyanic acid in an organic solvent therefor, having a small amount of a labile halide compound, such as carbamoyl chloride.

Stable isocyanic acid compositions

A process for producing aromatic mono- and polyisocyanates by the addition reaction of isocyanic acid with vinyl aromatics is disclosed. The process is characterized by the slow addition of the olefin to a reaction mass of solvent and isocyanic acid to maintain the isocyanic acid in high excess to unreacted olefin.

Manufacture of isocyanates

Removing water from wet isocyanic acid in organic solution of said isocyanic acid by addition hereto of a hydrogen halide or a compound which forms hydrogen halide in said solution in amount sufficient to provide a molar excess of hydrogen halide in said solution relative to the water, and ammonia if any, present in said solution.

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Norwalk, CT, United States of America

Allan M Feldman