| 摘要 |
<p>Polyurethane coatings obtainable by reacting an aliphatic isocyanate prepolymer (I) containing uretdione and/or oxadiazinetrione groups with a polyol component (II) including specified diol chain extenders are new. Polyurethane coatings obtainable by reacting an aliphatic isocyanate prepolymer (I) with a polyol component (II) are new, where: (a) the solids of (I) comprise 1-8 wt.% free isocyanate (NCO) groups, less than 2% free diisocyanate monomer and 0.1-1.5 mole/kg of aliphatically bound uretdione groups of formula (Ia) and/or oxadiazinetrione groups of formula (Ib); (b) comprises at least 50%, based on NCO-reactive group equivalents, of diols of formula HO-X-Y-X-OH (IIa); and (c) the ratio of free NCO group equivalents in (I) to NCO-reactive group equivalents in (II) is 0.9-1.5. [Image] Y : methylene, ethylene, ethynylene, 1,4-, 1,3- or 1,2-cyclohexylene or 1,4-, 1,3- or 1,2-phenylene; X : methylene, OCH 2CH 2 or 1,4-, 1,3- or 1,2-cyclohexylene. Independent claims are also included for the following: (1) a process for coating textiles and leather, comprising applying (I) and (II) to the textile or leather by casting and allowing them to react in situ; (2) textiles and leather with a polyurethane coating as above.</p> |
