| 摘要 |
HEAT CURABLE, EXPANDABLE ONE-COMPONENT POLYURETHANE COMPOSITION Heat curable, expandable one-component polyurethane compositions are described. These compositions comprise a) an isocyanate prepolymer which is flowable at room temperature, and is obtained by the reaction of an organic polyisocyanate with a polyhydroxyl compound; b) a solid, finely divided polyhydroxyl compound which has an average at least two hydroxyl groups per molecule, is insoluble in the prepolymer phase a), and is finely distributed in the prepolymer phase a); and c) a solid, finely divided blowing agent which is finely distributed in the prepolymer phase a); with the proviso that the decomposition temperature of the blowing agent c) is not significantly above the curing temperature of the composition. These polyurethane compositions may also comprise d) auxiliary agents and additives such as pigments, catalysts, stabilizers, flow improvers, thickeners, drying agents and foam regulators.
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