Polyurethane prepolymers, rebonded polyurethane foam and methods

Details Polyurethane prepolymers, rebonded polyurethane foam and methods Polyurethane prepolymers, rebonded polyurethane foam and methods

1976-04-05

1978-04-04

Cockeram, H.S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 25AD, 260 25AK, 260 25AP, 260 25AT, 260 775AP, C08G 1814, C08G 1848, C08G 1876

Patent

active

040827038

ABSTRACT:
This invention relates to novel polyurethane prepolymers which consist essentially of the reaction product of a polyoxyalkylene polyol having a critical oxyethylene content and an isocyanate constituent, 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.

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