| 摘要 |
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 DEG C. to 300 DEG C., following which ammonia and other by-products are separated from the aliphatic, cycloaliphatic, arylaliphatic or aliphatic-cycloaliphatic di- or polyurethane product. |
