Patent ID: 6262139
Filing Date: 2001-07-17
Classification: C08G

Abstract:
An isocyanate prepolymer composition, comprising the reaction product of:a. about 50.0 to 70.0% by weight, based on the total isocyanate prepolymer composition, of an isocyanate blend, said blend comprising, based on the total weight of the blend;(i) 55.0 to 75.0% by weight of 4,4'-diphenylmethane diisocyanate;(ii) 17.0 to 27.0% by weight of 2,4'-diphenylmethane diisocyanate;(iii) 1.0 to 10.0% by weight of 3-ring oligomers of polymethylene polyphenyl polyisocyanate; and(iv) 1.0 to 15.0% by weight of n-ring oligomers of polymethylene polyphenyl polyisocyanate (n being greater than 3);b. about 5.0 to 30.0% by weight, based on the total isocyanate prepolymer composition, of a polyhydroxy-containing polyol having a molecular weight of from 700 to about 6,000; andc. about 25.0 to about 75.0% by weight, based on the total isocyanate prepolymer composition, of toluene diisocyanate.