| 摘要 |
1,125,836. Derivatives of isocyanates and polyamines. GENERAL MILLS Inc. 17 Aug., 1966 [17 Sept., 1965], No. 36915/66. Heading C2C. [Also in Division C3] Novel derivatives of an organic isocyanate and a polyamine having at least one free secondary amine group and at least two primary amine groups, the said primary amine groups being blocked by aldimine or ketimine groups are prepared by reacting about equivalent amounts of the polyamine with the isocyanate, the equivalents being based on the free secondary amine groups of the polyamine and the isocyanato groups of the isocyanate. Preferred polyamines are those of the formula where R is a difunctional aliphatic group containing from 2 to 48 carbon atoms and n is an integer from 1 to 20, and the primary amine groups are converted to aldimines or ketimines by reaction with a carbonyl compound. Preferred isocyanates which may be used are aliphatic, aromatic, aliphatic-aromatic, cycloaliphatic and araliphatic isocyanates and many isocyanates are specified. Particularly suitable isocyanates are those of the formula where y is 0 or 1, x is 2 to 4 and R<SP>1</SP> is the hydrocarbon group of polymeric fat acids. The reaction is effected by simply mixing the isocyanate with the blocked polyamine, preferably in a moisture-free atmosphere. The derivatives are used in the preparation of polyureas. |
