Polyurethane elastomers prepared from high molecular weight prep

Details Polyurethane elastomers prepared from high molecular weight prep Polyurethane elastomers prepared from high molecular weight prep

1985-12-27

1987-10-20

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

252182, 524196, 528 60, 528 61, 528 64, 528 65, 528 66, C08G 1814

Patent

active

047014768

ABSTRACT:
This invention is an improvement in a process for preparing polyurethane and/or polyurea polymers wherein an isocyanate terminated quasi-prepolymer is reacted with an active hydrogen-containing composition to form a polyurethane and/or polyurea polymer, the improvement comprising employing as the quasi-prepolymer a solution of an isocyanate terminated prepolymer in a monomeric polyisocyanate, wherein said isocyanate-terminated prepolymer is the reaction product of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive material, and said isocyanate-terminated prepolymer has an average molecular weight of at least twice that of said relatively high equivalent weight isocyanate-reactive material.
In another aspect, this invention is a quasi-prepolymer which comprises a solution of an isocyanate-terminated prepolymer in a monomeric polyisocyanate, wherein said isocyanate-terminated prepolymer is the reaction product of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive material, and said isocyanate-terminated prepolymer has an average molecular weight of at least twice that of said relatively high equivalent weight isocyanate-reactive material.

REFERENCES:
patent: 4327204 (1882-04-01), Oysizu et al.

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