The present invention relates to diisocyanates having an isocyanate content of from about 20 to 50% by weight, optionally in the form of isomeric mixtures, characterized in that, in addition to containing a sterically unhindered isocyanate group attached to a primary aliphatic carbon atom, they contain a sterically hindered isocyanate group attached to a tertiary carbon atom which forms part of a cycloaliphatic ring system. The invention also relates to the use of the new diisocyanates, optionally blocked with blocking agents for isocyanate groups, as isocyanate component for the preparation of polyurethanes suitable for use as coatings.
本发明涉及具有约20至50重量%的
异氰酸酯,可选地为同分异构体混合物,其特征在于除了含有连接到初级脂肪烷基碳原子上的立体位阻不受限制的
异氰酸酯基团之外,还含有连接到环状脂肪环系中的三级碳原子上的立体位阻
异氰酸酯基团。本发明还涉及使用新的
异氰酸酯,可选地用
异氰酸酯基团阻滞剂阻滞,作为
异氰酸酯组分用于制备适用于涂层的聚
氨酯。