Aqueous cationic polyurethane dispersions
AssigneeAgfa NV
InventorsHubertus Van Aert, Johan Loccufier, Marie Lehericey, Mei-Yuan Hsu
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Abstract
An aqueous polyurethane resin dispersion, the polyurethane resin having a polyalkylene oxide in a side chain thereof and is obtainable by reacting in an organic solvent, a polyisocyanate with a 1,2 or 1,3 polyether diol and with a polymeric diol selected from the group consisting of polyester diol, polyether diol, polycarbonate diol, polyacrylate diol and polyolefin diol and by adding a cationic surfactant or cationic surfactant precursor to the organic solvent.
Claims16
An aqueous polyurethane resin dispersion, the polyurethane resin having a polyalkylene oxide in a side chain thereof and is obtained by reacting in an organic solvent, a polyisocyanate with a polyether diol according to Formula 1:
- wherein R1 is methyl or ethyl, R2 is H or C1-C4 alkyl, and n represents an integer from 5 to 50, and
- with a polymeric diol selected from the group consisting of polyester diol, polycarbonate diol, polyacrylate diol, and polyolefin diol, and
- by adding a cationic surfactant or cationic surfactant precursor to the organic solvent, wherein the cationic surfactant comprises reactive groups capable of reacting with polyisocyanate.
An aqueous treatment liquid for inkjet printing comprising a flocculant and a polyurethane resin dispersion in an amount of from 1 wt. % to 30 wt. % with respect to the total weight of the treatment liquid, the polyurethane resin having a polyalkylene oxide in a side chain thereof and is obtained by reacting in an organic solvent, a polyisocyanate with a polyether diol according to Formula 1:
- wherein R1 is methyl or ethyl, R2 is H or C1-C4 alkyl, and n represents an integer from 5 to 50, and
- with a polymeric diol selected from the group consisting of polyester diol, polycarbonate diol, polyacrylate diol, and polyolefin diol, and
- by adding a cationic surfactant or cationic surfactant precursor to the organic solvent.
An aqueous inkjet ink comprising a pigment dispersion and a polyurethane resin dispersion in an amount of from 1 wt. % to 30 wt. % with respect to the total weight of the ink, the polyurethane resin having a polyalkylene oxide in a side chain thereof and is obtained by reacting in an organic solvent, a polyisocyanate with a polyether diol according to Formula 1:
- wherein R1 is methyl or ethyl, R2 is H or C1-C4 alkyl, and n represents an integer from 5 to 50, and
- with a polymeric diol selected from the group consisting of polyester diol, polycarbonate diol, polyacrylate diol, and polyolefin diol, and
- by adding a cationic surfactant or cationic surfactant precursor to the organic solvent, and
- the pigment dispersion comprising at least one dispersing agent having the Formula III
- wherein
- R1 is selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkaryl group, and a substituted or unsubstituted (hetero) aryl group;
- L represents a divalent linking group comprising 2 to 10 carbon atoms;
- R2, R3, and R4 are each independently selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkaryl group, and a substituted or unsubstituted (hetero) aryl group;
- R5 represent a hydrocarbon group comprising at least 8 carbon atoms;
- and
- X− represents an anion to compensate the positive charge of the ammonium group.
Dependencies are inferred from the claim text.