摘要:
Die Erfindung betrifft strahlenhärtbare Bindemittel aus Umsetzungsprodukten von Polyisocyanaten mit ethylenisch ungesättigten hydroxylgruppenhaltigen Partialestern und Hydroxyalkylacrylaten, dadurch gekennzeichnet, daß das Umsetzungsprodukt aus in das oligomere Bindemittel eingebauten Einheiten von A) 1 Grammäquivalent NCO eines Polyisocyanats mit 2 - 3 Isocyanatgruppen pro Molekül, B) 0,4 - 1,2 Grammäquivalenten OH eines ethylenisch ungesättigten Partialesters mit einer OH-Zahl von 80 bis 150 aus einem oxalkylierten Trimethylolpropan mit einem Oxalkylierungsgrad von 3 bis 4,5 und Acrylsäure oder Methacrylsäure oder deren Mischung, C) 0 - 0,6 Grammäquivalenten OH eines Hydroxyalkylacrylates oder Hydroxyalkylmethacrylates oder deren Mischung mit 2 - 6 C-Atomen in der Alkylgruppe besteht, wobei die Summe der OH-Grammäquivalente aus B und C 1 - 1,2 beträgt, sowie ein Verfahren zu ihrer Herstellung. Die erfindungsgemäßen Bindemittel werden in 20 - 70 gew.-%igen wäßrigen Dispersionen zur Imprägnierung, Beschichtung, Verfestigung oder Grundierung von textilen Materialien, Holz, Kunststoffen, Vlies oder Leder eingesetzt.
摘要:
The invention relates to a method for producing low-viscosity radiation-curable aqueous dispersions based on polyurethane acrylates (UV-PUDs), wherein the UV-PUDs hydrophilized by means of hydroxy functionalized carbolic acids have a lower initial viscosity if a majority of the urethanization, that is, converting of the NCO functionalized compounds with the O H-functionalized compounds, takes place initially without the presence of the acid-bearing compounds, and the acid-bearing compounds are installed by means of the hydroxyl function thereof as late as possible.
摘要:
Polymers whose surfaces are modified by endgroups that include amphipathic surface-modifying moieties. An amphipathic endgroup of a polymer molecule is an endgroup that contains at least two moieties of significantly differing composition, such that the amphipathic endgroup spontaneously rearranges its positioning in a polymer body to position the moiety on the surface of the body, depending upon the composition of the medium with which the body is in contact, when that re-positioning causes a reduction in interfacial energy. An example of an amphipathic surface-modifying endgroup is one that has both a hydrophobic moiety and a hydrophilic moiety in a single endgroup. For instance, a hydrophilic poly(ethylene oxide) terminated with a hydrophilic hydroxyl group is not surface active in air when the surface-modifying endgroup is bonded to a more hydrophobic base polymer. If the hydroxyl group on the oligomeric poly(ethylene oxide) is replaced by a hydrophobic methoxy ether terminus, the poly(ethylene oxide) becomes surface active in air, and allows the poly(ethylene oxide) groups to crystallize in the air-facing surface. In this example, immersion in water destroys the crystallinity as the poly(ethylene oxide) sorbs water and the hydrophobic methoxy group retreats below the surface of the polymer. Also disclosed are methods and articles of manufacture that make use of these polymers.
摘要:
Polymers whose surfaces are modified by endgroups that include amphipathic surface-modifying moieties. An amphipathic endgroup of a polymer molecule is an endgroup that contains at least two moieties of significantly differing composition, such that the amphipathic endgroup spontaneously rearranges its positioning in a polymer body to position the moiety on the surface of the body, depending upon the composition of the medium with which the body is in contact, when that re-positioning causes a reduction in interfacial energy. An example of an amphipathic surface-modifying endgroup is one that has both a hydrophobic moiety and a hydrophilic moiety in a single endgroup. For instance, a hydrophilic poly(ethylene oxide) terminated with a hydrophilic hydroxyl group is not surface active in air when the surface-modifying endgroup is bonded to a more hydrophobic base polymer. If the hydroxyl group on the oligomeric poly(ethylene oxide) is replaced by a hydrophobic methoxy ether terminus, the poly(ethylene oxide) becomes surface active in air, and allows the poly(ethylene oxide) groups to crystallize in the air-facing surface. In this example, immersion in water destroys the crystallinity as the poly(ethylene oxide) sorbs water and the hydrophobic methoxy group retreats below the surface of the polymer. Also disclosed are methods and articles of manufacture that make use of these polymers.