Liquification of trans, trans-4,4'-diisocyanate dicyclohexylmeth

Details Liquification of trans, trans-4,4'-diisocyanate dicyclohexylmeth Liquification of trans, trans-4,4'-diisocyanate dicyclohexylmeth

1993-06-30

1995-10-03

Dees, Jose G.

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

Organic compounds

Isocyanate esters

560331, 560351, C07C24900

Patent

active

054553741

ABSTRACT:
The present invention relates to a liquid, storage-stable isocyanate having a viscosity of less than 100,000 mPa.s at 23.degree. C. and an isocyanate content of from about 9 to 20% by weight, and is prepared by reacting a solid 4,4'-methylene bis(cyclohexyl isocyanate) with a blocking agent. The 4,4'-methylene bis(cyclohexyl isocyanate) must contain at least 35 to 100% by weight of the trans,trans isomer. More generally, this liquid isocyanate is prepared by reacting the solid or semi-solid 4,4'-methylene bis (cyclohexyl isocyanate) with the blocking agent in quantities such that at least 22% but less than 60% of the isocyanate groups are blocked. Preferred blocking agents are the ketoximes, and mixtures thereof.

REFERENCES:
patent: 4363686 (1991-12-01), Komarek
patent: 5071937 (1991-12-01), Potter et al.
patent: 5175350 (1992-12-01), Seneker et al.
patent: 5232988 (1993-08-01), Venham et al.
patent: 5280100 (1994-01-01), Venham

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