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

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

C - Chemistry, Metallurgy

07

C

C07C 271/60 (2006.01) C07C 263/18 (2006.01) C07C 265/10 (2006.01) C07D 223/10 (2006.01) C07D 249/12 (2006.01)

Patent

CA 2125362

LIQUIFICATION OF TRANS,TRANS-4,4'-DIISOCYANATE DICYCLOHEXYLMETHANE BY PARTIALLY REACTING THE ISOCYANATE GROUPS WITH BLOCKING AGENTS ABSTRACT OF THE DISCLOSURE The present invention relates to a liquid, storage-stable isocyanate having a viscosity of less than 100,000 mPa.s at 23°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.

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