Polyisocyanate prepolymer compositions and soft elastomers prepa

Details Polyisocyanate prepolymer compositions and soft elastomers prepa Polyisocyanate prepolymer compositions and soft elastomers prepa

1997-09-18

1999-02-16

Acquah, Samuel A.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528 48, 528 59, 528 65, 528 66, 528 76, 528 85, 525453, 525454, 524773, 524839, C08F28300, C08K 509

Patent

active

058721932

ABSTRACT:
A polyisocyanate prepolymer composition which comprises the reaction product of a) diphenylmethane diisocyanate composition and b) an active hydrogen containing compound having a number average molecular weight of at least about 2000 wherein the reaction is carried out in the presence of a diluent capable of maintaining the average viscosity of the resulting prepolymer below about 500 cps at 25.degree. C. The prepolymer may be reacted with a resin composition to prepare soft elastomers.

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