申请人:Evonik Operations GmbH
公开号:US20210403417A1
公开(公告)日:2021-12-30
The invention relates to a process for preparing a diisocyanate of the formula (A)
where R is selected from the group consisting of alkyl, aryl, and combinations thereof, comprising the following process steps in the indicated order;
1) providing an intermediate of the formula (B) with a process using lysine and urea
and
where R and each R′ are independently selected from the group consisting of alkyl, aryl, and combinations thereof; and
2) thermolytic cleavage of the intermediate of the formula (B),
thereby affording the diisocyanate of the formula (A),
and also to the diisocyanate directly prepared therewith.
本发明涉及一种制备式(A)中二异氰酸酯的过程,其中R选择自烷基、芳基和它们的组合,包括以下步骤,按照指定的顺序进行:1)使用赖氨酸和尿素的过程制备式(B)的中间体,其中R和每个R'独立选择自烷基、芳基和它们的组合;2)热解式(B)的中间体,从而得到式(A)的二异氰酸酯,以及直接制备的二异氰酸酯。