Polyurethane prepolymers, rebonded polyurethane foams and...

Details Polyurethane prepolymers, rebonded polyurethane foams and... Polyurethane prepolymers, rebonded polyurethane foams and...

C - Chemistry, Metallurgy

08

J

403/12, 402/151

C08J 9/22 (2006.01) C08G 18/48 (2006.01) C08G 18/14 (1980.01)

Patent

CA 1047686

ABSTRACT OF THE DISCLOSURE This invention relates to novel polyurethane prepolymers which consist essentially of the reaction product of polyoxyalkylene polyol having a critical oxyethylene content and an isocyanate con- stituent, the reaction product having a defined level of free NCO. Particularly useful prepolymers are produced using a tolylene diisocyanate residue. The prepolymers provided have outstanding utility for rebonding polyurethane foams for applications such as, for example, carpet underlays and allow significant reductions in the adhesive level used in forming such rebonded foams and in the demolding cure times in comparison with presently used prepolymer adhesives. The prepolymers are also useful for applications in which polyurethane prepolymers are used presently such as, for example, in hydrophilic foams.

254799

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