申请人:DAICEL CHEMICAL INDUSTRIES, LTD.
公开号:EP0477376A1
公开(公告)日:1992-04-01
A process for producing polyurethane useful as coating material, which comprises preparing dialkyl carbonate substantially without using phosgene, reacting the carbonate with a diamine to give a urethane, thermally decomposing it into a diisocyanate, and converting it into a polyurethane in the presence of a Lewis acid and/or a protonic acid. The reaction of a diisocyanate compound containing a reduced amount of chlorine is promoted by a Lewis acid and/or a protonic acid.
一种生产用作涂层材料的聚氨酯的工艺,包括基本不使用光气制备碳酸二烷基酯,使碳酸酯与二胺反应生成聚氨酯,热分解成二异氰酸酯,并在路易斯酸和/或质子酸存在下转化成聚氨酯。路易斯酸和/或质子酸可促进含氯量降低的二异氰酸酯化合物的反应。