Method for synthesis of aliphatic isocyanates from aromatic...

Details Method for synthesis of aliphatic isocyanates from aromatic... Method for synthesis of aliphatic isocyanates from aromatic...

2005-08-02

2005-08-02

Tsang, Cecilia J. (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Isonitriles

C564S450000, C564S451000

Reexamination Certificate

active

06924385

ABSTRACT:
The invention relates to a method for synthesis of aliphatic isocyanates from aromatic isocyanates in substantially 3 stages. In particular, the invention relates to a method for synthesis of bis{4-isocyanatocyclohexyl}methane (H12MDI) from bis{4-isocyanatophenyl}methane (MDI). More especially, the invention relates to a method for synthesis of H12MDI with a trans-trans isomer content of <30%, preferably of <20%, particularly preferably of 5 to 15%.

REFERENCES:
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patent: 0 813 906 (1997-12-01), None
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patent: 1-551-832 (1979-09-01), None

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