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1.
公开(公告)号:US4465638A
公开(公告)日:1984-08-14
申请号:US459463
申请日:1983-01-20
IPC分类号: C07C265/12 , C07D229/00 , C08G18/76 , C07C119/048
CPC分类号: C07C265/12 , C07D229/00 , C08G18/7671
摘要: This invention relates to a process for utilizing the sediments in pure MDI which comprises(a) heating the sediments at temperatures of 180.degree. C. to 250.degree. C. for 0.25 hour to 6 hours in the presence of crude MDI; and(b) cooling the product to a temperature of 60.degree. C. or less within 5 minutes.The sediment-free crude MDI which results can then be used for the preparation of polyurethane products.
摘要翻译: 本发明涉及一种在纯MDI中利用沉淀物的方法,其包括(a)在粗MDI存在下,在180℃至250℃的温度下加热沉淀物0.25小时至6小时; 和(b)在5分钟内将产品冷却至60℃或更低的温度。 得到的无沉淀的粗MDI可用于制备聚氨酯产品。