Hydrolysis process for polyamines
AssigneeBayer Aktiengesellschaft
InventorsWerner Rasshofer, Klaus Konig, Hans-Joachim Meiners, Gerhard Grogler
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Abstract
Polyamines containing primary amino groups are made by hydrolyzing an isocyanate with water in the presence of a solvent which is a carboxylic acid amide. The solvent must be used in a quantity of at least 10% by weight solvent based on 100% by weight of isocyanate. The weight ratio of solvent to water must be from 3 to 200. A homogeneous phase is maintained during the hydrolysis which is carried out at temperatures of from 20.degree. to 210.degree. C. A not incorporable basic and/or metal catalyst particularly alkali metal hydroxides may be employed. The polyamines produced by this process are particularly useful for the production of polyurethanes.
Claims11
A one-step process for the production of polyamines containing primary amino groups in which
- (a) an organic isocyanate having an isocyanate content of from 0.5 to 40 wt. % is hydrolyzed with
- (b) from 1.25 to 12 mols of water for each equivalent of isocyanate groups in (a) in the presence of
- (c) at least 10% by weight of a water-soluble carboxylic acid amide based on 100% by weight of (a) and
- (d) a not-incorporable catalyst consisting of 0.0001 to 0.099% by weight, based on 100 % by weight of (a), or an alkali metal hydroxide;
- in which the weight ratio of (c) to (b) is from 10 to 150, a homogeneous phase is maintained during hydrolysis, and the hydrolysis is carried out at a temperature of from 20.degree. to 210.degree. C.
Dependencies are inferred from the claim text.