| 摘要 |
In heat-setting mixtures of a polyisocyanate with a polyol which have a long shelf life at room temperature, the polyisocyanate is present, in the form of discrete particles, in the polyol, and the polyisocyanate particles are deactivated at their surface. From 0.01 to 0.499 equivalent percent of the total amount of isocyanate groups present is deactivated by a primary or secondary amine or water, or from 0.01 to 20 equivalent percent of the said isocyanate groups is deactivated with a compound containing carboxyl, phenolic hydroxyl, amide or hydrazide groups. These mixtures are useful as coating compositions, adhesives and sealant materials, particularly as undersealants for motor vehicles.
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