FORFARANDE FOR FRAMSTELLNING AV EN VATTENHALTIG DISPERSION AV ETT AROMATISKT POLYISOCYANAT BLOCKERAT MED EN FENOLFORENING

摘要

Aqueous dispersions of aromatic polyisocyanates blocked with phenolic compounds are prepared by mixing the polyisocyanate and an aqueous solution containing an excess of the phenolic compound in the presence of a basic catalyst at a temperature above the melting point of the polyisocyanate.