Process for the preparation of aliphatic di- and polyurethanes
AssigneeBASF SE
InventorsFranz Merger, Friedrich Towae
Life of this patent
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Abstract
A process for the preparation of aliphatic, cycloaliphatic, arylaliphatic and aliphatic-cycloaliphatic di- and polyurethanes wherein primary aliphatic, cycloaliphatic, arylaliphatic or aliphatic-cycloaliphatic di- or polyamines are reacted with urea and a primary or secondary aliphatic alcohol at temperatures of above 190.degree. C. to 300.degree. C., following which ammonia and other by-products are separated from the aliphatic, cycloaliphatic, arylaliphatic or aliphatic-cycloaliphatic di- or polyurethane product.
Claims18
A process for the preparation of bis- or higher functional N-alkylcarbamates comprising:
- (a) reacting an aliphatic primary di- or polyamine with urea and a primary or secondary aliphatic alcohol in an amino-group to urea to alcohol ratio of from about 1:0.9:1 to 1:5:20 at a temperature of from in excess of 190.degree. C. to about 300.degree. C.;
- and
- (b) separating the bis- or higher functional N-alkyl carbamate product from unreacted and partly reacted starting materials, impurities, and by-products.
A multiple step process for the preparation of bis- or higher functional N-alkyl carbamates in shortened reaction time comprising:
- (a) reacting in a first step an aliphatic primary di- or polyamine, urea, and a primary or secondary aliphatic alcohol in an amino-group to urea to alcohol ratio of from about 1:1:1 to about 1:1.5:2 at a temperature of from about 180.degree. C. to about 300.degree. C. for a period of from 1 to 4 hours;
- (b) adding in a subsequent step sufficient alcohol to increase the alcohol to amino-group ratio to from about 2.5:1 to about 7.5:1, and continuing the reaction for a total time period of from 4 to 20 hours;
- and
- (c) separating said bis- or higher functional N-alkyl carbamate product from unreacted and partly reacted starting materials, impurities and by-products.
Dependencies are inferred from the claim text.