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Fluorine-containing dispersants for aqueous paints and coating compositions

  • US 5,672,673 A
  • Filed: 06/17/1996
  • Issued: 09/30/1997
  • Est. Priority Date: 06/21/1995
  • Status: Expired due to Fees
First Claim
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1. A process for the preparing a water-soluble polyaddition compound containing perfluoroalkyl groups which comprises reactingA) a polyisocyanate component having an average NCO functionality of at least 2.5 and an NCO content of 5 to 50 wt. % withB) 0.1 to 50 equivalent %, based on the equivalents of isocyanate groups present in component A), of a fluorine-containing alcohol component corresponding to the formula ##STR2## wherein Rf represents a perfluoroalkyl group having 4 to 20 carbon atoms,R1 represents an alkyl group having 1 to 6 carbon atoms,AO represents an alkylene oxide radical having 2 to 10 carbon atoms andr is a number from 1 to 3,C) 5 to 90 equivalent %, based on the equivalents of isocyanate groups present in component A), of a monohydric alcohol component containing one or more monohydric polyether alcohols which have a number average molecular weight of 150 to 5000 and an ethylene oxide content of 50 to 99.5 wt. %, and have been prepared by alkoxylation of a monohydric starter molecule, provided that component C) is present in an amount such that the resulting polyaddition compound contains at least 30 wt. % of ethylene oxide units incorporated via component C),D) 5 to 80 equivalent %, based on the equivalents of isocyanate groups present in component A), of an amine component containing at least one tertiary amine having a molecular weight of 88 to 250 and containing at least one isocyanate-reactive group andE) 0 to 40 equivalent %, based on the equivalents of isocyanate groups present in component A), of one or more compounds which contain one or more isocyanate-reactive groups, are different from components B) to D), and have ethylene oxide content of less than 50 wt. % and a number average molecular weight of 32 to 3000,at an isocyanate index of 80 to 200 to form urethane and optionally urea groups, and optionally reducing any NCO groups present in excess to a maximum content of 1.0 wt. % by means of secondary reactions carried out simultaneously or subsequently to the formation of the polyaddition compound.

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