Isocyanate-terminated prepolymers, a process of producing...

Details Isocyanate-terminated prepolymers, a process of producing... Isocyanate-terminated prepolymers, a process of producing...

C - Chemistry, Metallurgy

08

G

C08G 18/10 (2006.01) C08G 18/48 (2006.01) C08G 18/72 (2006.01)

Patent

CA 2188502

This invention relates to isocyanate-terminated prepolymers, a process for the preparation of these isocyanate-terminated prepolymers, a process for the production of polyurethane\polyurea elastomers prepared from a diisocyanate comprising these prepolymers, and the elastomers produced by this process. These isocyanate-terminated prepolymers have a viscosity less than about 6000 mPas at 80°C and an NCO content of about 3 to 10%. These isocyanate-terminated prepolymers are the reaction product of a) an aromatic diisocyanate, b) a polyether polyol having an OH number of about 25 to 125 and containing from about 1.8 to 2.5 hydroxyl groups, and c) an aliphatic diisocyanate. The equivalent ratio of the polyether polyol to the aromatic diisocyanate is from about 1.0:0.7 to 1.0:1.1.

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