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.
一种制备脂肪族、环脂肪族、芳基脂肪族和脂肪族-环脂肪族二元和多元
脲酯的方法,其中一次性脂肪族、环脂肪族、芳基脂肪族或脂肪族-环脂肪族二元或多元胺与
尿素和一次性或二次性脂肪族醇在高于190摄氏度至300摄氏度的温度下反应,随后将
氨和其他副产物与脂肪族、环脂肪族、芳基脂肪族或脂肪族-环脂肪族二元或多元
脲酯产品分离。