Patent ID: 6509433
Filing Date: 2003-01-21
Classification: C08G,C09D

Abstract:
A blocked fluorine-containing polyisocyanate which has a fluorine content, calculated as F=19, of 1.0 to 20.0 wt. % and is suitable for preparing stoving coatings having a water- and soil-repellent surface, wherein the fluorine-containing polyisocyanate comprises the reaction product of an aliphatic polyisocyanate or polyisocyanate mixture having an NCO content of 10 to 25 wt. % and a functionality of at least 2.5 with a monofunctional isocyanate blocking agent and a fluorinated monoalcohol, which comprises the addition product of perfluoroethyl iodide, perfluorobutyl iodide or perfluorohexyl iodide onto allyl alcohol with subsequent hydro-deiodination to give the corresponding fluorinated alcohol whereini) 75 to 95 equivalent-% of the isocyanate groups are reacted with an isocyanate blocking agent, ii) 5 to 25 equivalent-% of the isocyanate groups are reacted with said fluorinated monoalcohol and iii) the equivalents of i) and ii) add up to 100%.