| 摘要 |
<p>Mo-2402 LeA 21,088 COATING AGENTS OF POLYURETHANE DISPERSIONS AND THE USE THEREOF FOR TOP COATS AND FINISHES This invention relates to coatinq compositions based on aqueous polyurethane dispersions, as well as the use of the coating compositions for the production of top coats or finishes on flexible substrates, particularly on PVC. Thc present coating agents contain an aqueous polyurethane dispersion having certain physico-chemical properties and the following composition of the solid substance: (A) from about 30 to 60%, by weight, of a hexane diol1,6-polyester diol having a molecular weight of from about 500 to 6000; (B) up to about 8%, by weight, of a relatively low molecular weight triol having a molecular weight of from about 91 to 399; (C) from about 3 to 30%, by weight, of one or more monoor poly-functional compounds bearing cationic and/or anionic groups and/or containing non-ionic polyoxyethylene segments; (D) from about 20 to 50%, by weight, of a diisocyanate corresponding to the following general formula: wherein R1, R2 and R3, which may be the same or different, each represents hydrogen or a straight- or branched-chain aliphatic hydrocarbon radical containing from 1 to 4 carbon atoms; Mo-2402 (E) from about 2.5 to 20%, by welght, of other aliphatic and/or cycloaliphatic diisocyanates; and (F) from about 0.5 to 4%, by weight, of hydrazine; and optionally conventional additives,auxiliaries and catalysts. Mo-2402</p> |
