Process for producing a liquid isocyanate prepolymer...

Details Process for producing a liquid isocyanate prepolymer... Process for producing a liquid isocyanate prepolymer...

C - Chemistry, Metallurgy

08

G

402/149, 402/151

C08G 18/10 (2006.01) C08G 18/48 (2006.01) C08G 18/80 (2006.01)

Patent

CA 1111186

ABSTRACT OF THE DISCLOSURE A novel liquid isocyanate prepolymer composition is disclosed. The prepolymer is obtained by reacting a poly- methylene polyphenylisocyanate containing from about 65 to about 85 percent by weight of methylenebis(phenylisocyanate) the remainder of said polymethylene polyphenylisocyanates having a functionality greater than 2, with from about 0.0185 to about 0.15 equivalent per equivalent of said polyphenyl- isocyanate of a polyoxyethyleneglycol having an average molecular weight of from about 200 to about 600. The liquid isocyanates so produced are characterized as storage stable liquids of relatively low viscosity which when used as the isocyanate component in polyurethane formulations, particularly molded polyurethanes, give rise to highly resilient and useful molded products. -1-

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