Isocyanate-terminated prepolymers with low free monomer...

C - Chemistry – Metallurgy – 08 – G

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402/159, 260/455

C08G 18/78 (2006.01) C08G 18/10 (2006.01) C08G 18/75 (2006.01)

Patent

CA 1216589

ISOCYANATE-TERMINATED PREPOLYMERS WITH LOW FREE MONOMER CONTENTS ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for the preparation of an isocyanate-terminated prepoly- mer having a content of unreacted diisocyanate of less than about 2% by weight, preferably less than about 1% by weight, based on the weight of the isocyanate- terminated prepolymer, and containing internal urethane groups based on 4,4'-diisocyanato-dicyclohexyl-methane by a) preparing an OH-terminated prepolymer from i) a high molecular weight polyol component, and/or ii) a low molecular weigh-t isocyanate- reactive component, and iii) a polyisocyanate component compris- ing 4,4'-diisocyanato-dicyclohexyl- methane at an NCO/OH equivalent ratio of about 0.5:1 to 0.9:1; b) forming the isocyanate-terminated prepolymer by reacting the OH-terminated prepolymer with a polyisocyanate other than 4,4'-diisocyanato- dicyclohexyl-methane containing aromatically-, aliphati- cally and/or cycloaliphatically-bound isocyanate groups at an NCO:OH equivalent ratio, based on the free -OH groups of component (a), of about 1.6:1 to 15:1, and c) reducing the amount of unreacted diisocya- nate to less than about 2% by weight, based on the weight of the isocyanate-terminated prepolymer. The present invention is also directed to the products prepared by this process and their use in one-component, moisture-cure systems or as the isocya- nate component in two-component polyurethanes.

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