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US5872278A Preparation of isocyanates having a light color 失效
具有浅色异氰酸酯的制备

Preparation of isocyanates having a light color
摘要:
In a process for preparing isocyanates having a light color by reacting the corresponding amines with phosgene, the amines are treated with solid inorganic substances containing Lewis acid and/or Bronsted acid centers prior to the reaction with the phosgene.
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