会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 3. 发明授权
    • Process for preparation of isocyanate compounds
    • 异氰酸酯化合物的制备方法
    • US5773643A
    • 1998-06-30
    • US358680
    • 1994-12-19
    • Toyokazu YagiiTeruo ItokazuKiyokazu Murata
    • Toyokazu YagiiTeruo ItokazuKiyokazu Murata
    • C07C68/00C07C263/04C07C265/10C07C263/00
    • C07C263/04C07C68/005C07C2101/12
    • A diisocyanate compound substantially free from chlorine is prepared by the following consecutive steps (1), (2) and (3): (1) preparing dimethyl carbonate by a method selected from: (a) a method wherein carbon monoxide and oxygen are reacted with methanol, (b) a method wherein propylene oxide is reacted with carbon dioxide to prepare propylene carbonate, and then, the propylene carbonate is reacted with methanol, and (c) a method wherein a nitrous acid ester is catalytically reacted with carbon monoxide; (2) reacting the dimethyl carbonate with an aliphatic diamine in the presence of an alkali catalyst to prepare a corresponding urethane compound; and (3) thermally decomposing the urethane compound under a reduced pressure of 1 to 700 Torr in a high-boiling point solvent.
    • 通过以下连续步骤(1),(2)和(3)制备基本上不含氯的二异氰酸酯化合物:(1)通过选自以下的方法制备碳酸二甲酯:(a)一氧化碳和氧气反应的方法 (b)使环氧丙烷与二氧化碳反应制备碳酸丙烯酯的方法,然后使碳酸亚丙酯与甲醇反应,和(c)亚硝酸酯与一氧化碳催化反应的方法; (2)在碱催化剂存在下使碳酸二甲酯与脂肪族二胺反应,制备相应的氨基甲酸酯化合物; 和(3)在高沸点溶剂中在1〜700托的减压下热分解氨基甲酸酯化合物。