Polyisocyanate compositions for the preparation of flexible...

Details Polyisocyanate compositions for the preparation of flexible... Polyisocyanate compositions for the preparation of flexible...

C - Chemistry, Metallurgy

07

C

C07C 271/28 (2006.01) C08G 18/10 (2006.01) C08G 18/72 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2154836

The invention provides a liquid polyisocyanate prepolymer composition which is a result of combining about 50 to 90 percent by weight of an isocyanate blend (a.) having 55 to 75 weight percent 4,4'-MDI, 17 to 27 weight percent 2,4'-MDI, 1 to 10 weight percent 3-ring MDI oligomer, and 1 to 15 weight percent n-ring MDI oligomer (n greater than 3); about 5 to 30 weight percent of a polyhydroxy containing polyol (b.) having a molecular weight of from 700 to about 6, 000, and about 5 to 15 weight percent of a toluene diisocyanate (c.). The resulting isocyanate prepolymer composition has a free NCO content of from about 20 to 40 weight percent and particularly desirable flow characteristics. The invention further provides a method of making an isocyanate prepolymer composition, a process of making a polyurethane foam utilizing the isocyanate prepolymer composition of the invention, and polyurethane foams produced by the disclosed process.

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