초록 ▼

Disclosed is an aromatic diisocyanate prepolymer combined with a dibasic ester, preferably a mixed dialkyl ester of adipic, glutaric and succinic acids, which when used with amine or polyol curatives to make solid, non-foamed elastomeric polyurethane and/or polyurethane/urea products reduces viscosi

Disclosed is an aromatic diisocyanate prepolymer combined with a dibasic ester, preferably a mixed dialkyl ester of adipic, glutaric and succinic acids, which when used with amine or polyol curatives to make solid, non-foamed elastomeric polyurethane and/or polyurethane/urea products reduces viscosity and improves wettability of the castable polyurethane prepolymer without loss of cured physical properties. This improved wettability of the liquid prepolymer is useful for impregnation of fabrics, preferably polyesters, during the manufacture of a polyurethane coated fabric type belting.

대표청구항 ▼

[ I claim:] [1.] An organic diisocyanate prepolymer comprising:(a) a reaction product formed by reacting toluene diisocyanate or 4,4'-methylene bis (phenylisocyanate and at least one high molecular weight polyether or polyester polyol of between about 250 and about 10000 weight average molecular wei

[ I claim:] [1.] An organic diisocyanate prepolymer comprising:(a) a reaction product formed by reacting toluene diisocyanate or 4,4'-methylene bis (phenylisocyanate and at least one high molecular weight polyether or polyester polyol of between about 250 and about 10000 weight average molecular weight; at a temperature and for a time sufficient to form said reaction product; and(b) about 3 to about 7 weight percent of a dibasic ester blended with said reaction product, said dibasic ester being selected from the group consisting of aliphatic esters of oxalic, malonic, adipic, glutaric, succinic, maleic, or fumaric acid or combinations thereof.