White aqueous inkjet ink
An aqueous inkjet ink composition including water; an optional co-solvent; an optional dispersant; an optional resin; an optional wax; and a BaSO 4 pigment; wherein a particle size distribution is defined as Span=(Dn90−Dn10)/(Dn50); and wherein the BaSO 4 pigment has a wide particle size distribution wherein the Span is 0.75 or greater.
1 . An aqueous inkjet ink composition comprising:
water;
an optional co-solvent;
an optional dispersant;
resin particles comprising a polymerization product of reactants comprising a monomer, an acidic monomer, a hydrophilic monomer, a multifunctional monomer, and a reactive surfactant, and wherein the resin particles further comprise silica nanoparticles;
an optional wax; and
a pigment consisting essentially of a BaSO 4 pigment;
wherein a particle size distribution is defined as Span=(Dn90−Dn10)/(Dn50); and
wherein the BaSO 4 pigment has a wide particle size distribution and has a Span equal to 0.75 or greater.
2 . The aqueous inkjet ink composition of claim 1 , wherein the aqueous inkjet ink composition is free of other pigment.
3 . The aqueous inkjet ink composition of claim 1 , wherein the BaSO 4 pigment has the wide particle size distribution and has a Span equal to 1.0.
4 . The aqueous inkjet ink composition of claim 1 , wherein the BaSO 4 pigment has the wide particle size distribution and has a Span equal to 0.75, and wherein Dn50=400 nm, Dn10=250 nm, and Dn90=550 nm.
5 . The aqueous inkjet ink composition of claim 1 , wherein the BaSO 4 pigment has the wide particle size distribution and has a Span equal to 1.0, and wherein Dn50=400 nm, Dn10=150 nm, and Dn90=550 nm.
6 . The aqueous inkjet ink composition of claim 1 , wherein the BaSO 4 pigment is present in the aqueous inkjet ink composition in an amount of from about 1 to about 25 percent by weight based upon a total weight of the aqueous inkjet ink composition.
7 . The aqueous inkjet ink composition of claim 1 , wherein the BaSO 4 pigment is present in the aqueous inkjet ink composition in an amount of from about 10 to about 15 percent by weight based upon a total weight of the aqueous inkjet ink composition.
8 . The aqueous inkjet ink composition of claim 1 , wherein the optional co-solvent is present; and wherein the optional co-solvent comprises one or more organic solvents.
9 . The aqueous inkjet ink composition of claim 1 , wherein the optional co-solvent is present; and wherein the optional co-solvent comprises: a first organic solvent, and a second organic solvent, wherein the first organic solvent is a diol.
10 . The aqueous inkjet ink composition of claim 1 , wherein the optional co-solvent is present; and wherein the optional co-solvent comprises: a first organic solvent, and a second organic solvent, wherein the first organic solvent is propylene glycol.
11 . The aqueous inkjet ink composition of claim 1 , wherein the optional co-solvent is present; and wherein the optional co-solvent comprises: a first organic solvent, and a second organic solvent, wherein the second organic solvent is an alkanediol having from 2 to 8 carbon atoms.
12 . The aqueous inkjet ink composition of claim 1 , wherein the optional co-solvent is present; and wherein the optional co-solvent comprises: a first organic solvent, and a second organic solvent, wherein the second organic solvent is a hexanediol.
13 . The aqueous inkjet ink composition of claim 1 , wherein the optional wax is present; and wherein the optional wax comprises a member selected from the group consisting of paraffin wax, polyethylene wax, polypropylene wax, microcrystalline wax, polyolefin wax, montan based ester wax, carnauba wax, and combinations thereof.
14 . The aqueous inkjet ink composition of claim 1 , wherein the aqueous inkjet ink composition is free of titanium dioxide.
15 . A process of forming the aqueous ink composition of claim 1 comprising:
combining the water; the optional co-solvent; the optional dispersant; the resin particles; the optional wax; and the pigment consisting essentially of the BaSO 4 pigment, to form the aqueous ink composition.
16 . The process of claim 15 , wherein the aqueous ink composition is free of other pigment.
17 . The process of claim 15 , wherein the BaSO 4 pigment has the wide particle size distribution and has a Span equal to 0.75, and wherein Dn50=400 nm, Dn10=250 nm, and Dn90=550 nm; or
wherein the BaSO 4 pigment has the wide particle size distribution and has a Span equal to 1.0, and wherein Dn50=400 nm, Dn10=150 nm, and Dn90=550 nm.
18 . The process of claim 15 , wherein the BaSO 4 pigment is present in the aqueous ink composition in an amount of from about 1 to about 25 percent by weight based upon a total weight of the aqueous ink composition.