Polyurethane-polymer hybrid-dispersion with enhanced surface properties, method for the production and utilization thereof

A polyurethane-polymer hybrid dispersion prepared by a process comprising the steps of:

• a) preparing a dispersion component or binder component based on an aqueous solution or dispersion of an optionally hydroxy- or amino-functional polyurethane-polymer hybrid having fluorinated or unfluorinated side chains, by
• a1) admixing 5 to 100 parts by weight of a laterally fluorine-modified, anionically stabilized polyurethane base dispersion (A) having preferably an ideally linearly segmented structure, a polymer-bonded fluorine content of up to 5% by weight, a hydroxyl number and/or amine number of 0 to 250 mg KOH/g, a solids content of 20% to 60% by weight, a solvent content of 0 to 20% by weight, and an average molar mass of 5,000 to 100,000 daltons with 3 to 300 parts by weight of a monomer component (B) comprising
• (i) 1 to 100 parts by weight of one or more unsaturated monomers (B)(i) having one or more free-radically polymerizable double bonds, selected from the group consisting of acrylic acid, methacrylic acid, styrene, and derivatives thereof, or
• (ii) 1 to 100 parts by weight of one or more unsaturated fluorine-modified monomers (B)(ii) having one or more free-radically polymerizable double bonds, selected from the group consisting of an alkyl (per)fluoro (meth)acrylate, a (per)fluoroalkyl (meth)acrylate a (per)fluoroalkyl (per)fluoro(meth)acrylate, a reaction product of 1-(1-isocyanato-1-methylethyl)-3-(2-propenyl)benzene (m-TMI) and a perfluoroalkyl alcohol, or
• (iii) 1 to 100 parts by weight of one or more unsaturated optionally fluorine-modified monomers (B)(iii) having one or more free-radically polymerizable double bonds, selected from the group consisting of polyhedral oligomeric polysilsesquioxanes (POSS) of the formula (RSiO1.5)n with n=4, 6, 8, 10, 12;
• and R is an organic radical having 1 to 100 C atoms and 0 to 50 N, 0 to 50 O, or 0 to 50 F, 0 to 50 Si or 0 to 50 S atoms and a molar mass of 250 to 25,000 daltons,
• with 0.01 to 10 parts by weight of an initiator component (C), comprising at least one lipophilic free-radical initiator having one or more thermally labile azo or peroxo groups, and 0 to 200 parts by weight of water, wherein the monomer component (B), the initiator component (C), and the water may optionally be metered in simultaneously, successively or as a mixture to the polyurethane base dispersion (A), and subsequently
• a2) conducting, in the reaction mixture from stage a,), as a result of the thermal decomposition of component (C), a free-radical polymerization of component (B) within micelles of the polyurethane base dispersion (A),
• and, optionally,
• b) subsequently reacting the dispersion or binder component formed from components (A) to (C) from stage a2) with 20 to 100 parts by weight of a crosslinker component (D) (curing agent), wherein said crosslinker component or curing agent (D) is a water-dispersible (paint) polyisocyanate having at least one of an aliphatically, cycloaliphatically, or aromatically attached isocyanate group, wherein the polyisocyanate may optionally contain from 0 to 25% by weight of an organic solvent.