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US4871871A Process for the preparation of aromatic mono- and polyisocyanates 失效
制备芳族单和多异氰酸酯的方法

Process for the preparation of aromatic mono- and polyisocyanates
摘要:
An improved process is provided for the preparation of aromatic mono- and poly- isocyanates by the thermal decomposition of an aromatic bis dialkyl urea in solvent in the presence of a tertiary amine hydrohalide, such as pyridine hydrochloride, as a promoter for conversion of the urea groups to isocyanates.
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