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US 4,304,731 AGranted
Method for producing an aliphatic triisocyanate
AssigneeToray Industries, Inc.
InventorsMasaki Nishino, Yutaka Yasuhara
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Abstract
A novel aliphatic triisocyanate, 1,6,11-undecanetriisocyanate having the formula, ##STR1## is produced by phosgenation of 1,6,11-undecanetriamine or its salts. The phosgenation is carried out in one step method or a multi-step method.
Claims7
A method for producing 1,6,11-undecanetriisocyanate which comprises:
- a. forming 1,6,11-undecanetriamine into a crystalline salt in the presence of an alcohol having at least three carbon atoms,
- b. forming the resulting salt into a fine powder,
- c. reacting the resulting fine powder with carbonyl dihalide to produce the 1,6,11-undecanetriisocyanate product.
A method for producing 1,6,11-undecanetriisocyanate which comprises:
- a. adding 1,6,11-undecanetriamine at 0.degree.-20.degree. C. into an innert solvent which contains phosgene in a concentration of 20-50 wt. %,
- b. heating the resulting mixture at 65.degree.-75.degree. C. in the presence of phosgene,
- c. then raising the temperature of the resulting mixture to above 120.degree. C. in one hour in the presence of phosgene,
- d reacting the resulting mixture with phosgene at above 120.degree. C. more than 6 hours,
- e. purifying the resulting triisocyanate by vacuum distillation under a lower pressure than 0.8 Torr.
2 more elements
Dependencies are inferred from the claim text.