Process for the production of urethane-modified...

Details Process for the production of urethane-modified... Process for the production of urethane-modified...

C - Chemistry, Metallurgy

08

G

402/131

C08G 18/32 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01)

Patent

CA 1221487

A PROCESS FOR THE PRODUCTION OF URETHANE-MODIFIED POLYISOCYANATE COMPOSITIONS ABSTRACT OF THE DISCLOSURE Urethane-modified polyisocyanate compositions are made by reacting (a) an organic polyisocyanate or mixture of polyisocyanates having an NCO-content of from 5 to 45 wt % with (b) a hydantoin having an OH number of from 56 to 596 and containing two alcoholic hydroxyl groups. These reactants are used in quantities such that the NCO:OH equivalent ratio is from 2:1 to 50:1. The preferred polyisocyanates are 4,4'-diisocyanato- diphenylmethane and isomer mixtures thereof. The most preferred hydantoin is 5,5-dimethyl hydantoin. These urethane-modified polyisocyanates are particularly useful in the production of polyisocyanate addition products such as polyurethanes and polyisocyanurates.

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