HYDROPHILIC POLYURETHANE COATINGS
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Abstract
The present invention relates to a coating composition in the form of a dispersion containing a polyurethane urea which (1) is terminated by a copolymer unit of polyethylene oxide and polypropylene oxide, and (2) contains at least one hydroxyl-group-containing polycarbonate polyol.
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Citations
36 Claims
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1-16. -16. (canceled)
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17. A coating composition in the foun of a dispersion comprising a polyurethane urea which
(1) is terminated by a copolymer unit of polyethylene oxide and polypropylene oxide, and (2) comprises at least one hydroxyl-group-containing polycarbonate polyol.
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18. The coating composition according to claim 17, wherein the polyurethane comprises units based on at least one aliphatic, cycloaliphatic or aromatic isocyanate.
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19. The coating composition according to claim 17, wherein the polyurethane urea has a maximum ionic modification of 2.5 wt. %.
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20. The coating composition according to claim 17, wherein the coating composition comprises a polyurethane urea comprising
a) at least one polycarbonate polyol having a mean molar weight of from 400 g/mol to 6000 g/mol and a hydroxyl functionality of from 1.7 to 2.3, or mixtures of such polycarbonate polyols; -
b) at least one aliphatic, cycloaliphatic or aromatic polyisocyanate, or mixtures of such polyisocyanates, in an amount, per mole of polycarbonate polyol, of from 1.0 to 4.0 mol; c) at least one monofunctional mixed polyoxyalkylene ether of polyethylene oxide and polypropylene oxide, or a mixture of such polyethers, having a mean molar weight of from 500 g/mol to 5000 g/mol in an amount, per mole of polycarbonate polyol, of from 0.01 to 0.5 mol; d) at least one aliphatic or cycloaliphatic diamine or at least one amino alcohol, or mixtures of such compounds, in an amount, per mole of polycarbonate polyol, of from 0.05 to 3.0 mol; e) optionally one or more short-chained aliphatic polyols having a molar weight of from 62 g/mol to 500 g/mol in an amount, per mole of polycarbonate polyol, of from 0.1 to 1.0 mol; and f) optionally amine- or OH-containing structural units which are located at the ends of the polymer chains and close them off.
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21. A method of preparing a coated substrate with the coating composition according to claim 20, comprising the steps of:
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A) preparing a coating composition which comprises the steps of (I) placing constituents (a), (b), (c) and optionally (e) in a reaction vessel and optionally diluting them with a solvent that is miscible with water but inert towards isocyanate groups; (II) heating the composition obtainable from (I) to temperatures in the range of from 50 to 120°
C.;(III) metering in any constituents of (c) and optionally (e) not added at the beginning of the reaction; (IV) dissolving the resulting prepolymer from (III) with the aid of aliphatic ketones; (V) adding constituent (d) for chain extension; (VI) adding water to form a dispersion; and (VII) removing the aliphatic ketone, and B) coating a substrate with the coating composition obtained according to (A).
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22. The method according to claim 21, wherein the aliphatic ketone is removed in step (VIII) by distillation.
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23. The method according to claim 21, wherein after coating the substrate, the substrate is easy to clean or self-cleaning.
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24. The method according to claim 21, wherein the substrate is glass, optical glass, or a lens.
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25. The method according to claim 21, wherein the coated substrate is used in the sanitary field.
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26. The method according to claim 21, wherein the substrate is a packaging material.
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27. The method according to claim 21, wherein after coating, the substrate reduces fouling of the coated substrate.
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28. The method according to claim 21, wherein the substrate is an over- and under-water substrate, and wherein after coating, the substrate has a reduced frictional resistance towards water.
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29. The method according to claim 21, further comprising printing on the substrate after the substrate is coated.
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30. A formulation for cosmetic applications comprising the coating composition according to claim 17.
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31. An active-ingredient-releasing system for coating seeds comprising the coating composition according to claim 17, wherein the substrate is a seed.
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32. A glass, optical glass, or lens comprising the coating composition according to claim 17.
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33. A packaging material comprising the coating composition according to claim 17.
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34. A seed comprising the coating composition according to claim 17.
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35. A medical device comprising the coating composition according to claim 17.
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36. A substrate in the non-medical field comprising the coating composition according to claim 17.
Specification