Inkjet ink compositions

1. An inkjet ink composition comprising:

(a) a carbon black having the following properties:

OAN≥170 mL/100 g; and

STSA ranging from 160 to 220 m 2 /g,

wherein the carbon black is modified with at least one attached organic group;

(b) at least one polymeric dispersant selected from polyoxyethylene/polyoxypropylene block copolymers, styrene-acrylic resins, styrene-methacrylic resins, styrene-maleic acid copolymers, and styrene-maleic anhydride copolymers;

(c) at least one surfactant selected from ethoxylated siloxanes, succinic acid esters, and succinic acid salts; and

(d) at least one polyurethane.

2. The composition of claim 1 , wherein a ratio of STSA/BET surface area of the carbon black ranges from 0.7 to 1.

3. The composition of claim 1 , wherein the carbon black has a BET surface area ranging from 190 to 275 m 2 /g.

4. The composition of claim 1 , wherein the carbon black has a COAN of at least 120 mL/100 g.

5. The composition of claim 1 , wherein the carbon black has a COAN of at least 130 mL/100 g.

6. The composition of claim 1 , wherein the carbon black has a ratio of OAN/COAN ranging from 1.30 to 1.50.

7. The composition of claim 1 , wherein the carbon black is a furnace black.

8. The composition of claim 1 , wherein the at least one polymeric dispersant is selected from styrene-methacrylic resins.

9. The composition of claim 8 , wherein the styrene-methacrylic resins are selected from styrene-(meth)acrylic acid copolymers, styrene-(meth)acrylic acid-(meth)acrylate ester copolymers, styrene-α-methylstyrene-(meth)acrylic acid copolymers, and styrene-α-methylstyrene-(meth)acrylic acid-(meth)acrylate ester copolymers, and salts thereof.

10. The composition of claim 1 , wherein the at least one polymeric dispersant is selected from styrene-maleic acid copolymers, and styrene-maleic anhydride copolymers.

11. The composition of claim 1 , wherein the at least one polymeric dispersant is selected from polyoxyethylene/polyoxypropylene block copolymers.

12. The composition of claim 1 , wherein the at least one polymeric dispersant is selected from styrene-acrylic resins.

13. The composition of claim 1 , wherein the at least one surfactant is selected from succinic acid esters and salts thereof.

14. The composition of claim 13 , wherein the succinic acid esters are selected from alkylsulfosuccinic acid esters, alkylsulfosuccinates, and salts thereof.

15. The composition of claim 1 , wherein the at least one attached organic group is selected from carboxylic acids, sulfonic acids, phosphonic acids, hydroxyls, amines, and esters, amides, and salts thereof.

16. The composition of claim 1 , wherein the at least one attached organic group is selected from carboxylic acids.

17. The composition of claim 1 , wherein the at least one attached organic group is selected from benzene carboxylic acid, benzene dicarboxylic acid, benzene tricarboxylic acid, benzene sulfonic acid, and salts thereof.

18. The composition of claim 1 , wherein the carbon black is an oxidized carbon black.

19. The composition of claim 1 , wherein the at least one polyurethane is prepared from a polyester polyol, a polyether polyol, a polyhydroxy polycarbonate, a polyhydroxy polyacetal, a polyhydroxy polyacrylate, a polyhydroxy polyester amide, a polyhydroxy polyolefin, a polyhydroxy polydialkylsiloxane, or a polyhydroxy polythioether.

20. The composition of claim 1 , wherein the at least one polyurethane is prepared from a polyester polyol or a polyether polyol.

21. The composition of claim 1 , wherein the at least one polyurethane is present in an amount ranging from about 0.1 to about 10.0% by weight based on the total weight of the composition.

22. The composition of claim 1 , wherein the carbon black and the at least one polyurethane are present in a weight ratio ranging from about 10/1 to about 1/2.

23. The composition of claim 1 , wherein the at least one polyurethane is anionically self-stabilizing and has:

i) an acid number ranging from about 6 to about 70 mg KOH/g polyurethane; and

ii) a percentage by weight of polyol ranging from about 50% to about 90%.

24. The composition of claim 1 , wherein the at least one polyurethane has a molecular weight, Mw, ranging from about 10,000 to about 150,000 g/mol.

25. The composition of claim 1 , wherein the at least one polyurethane is a poly(propylene glycol)-based polyurethane.

26. An inkjet ink composition comprising:

(a) a carbon black having the following properties:

OAN≥170 mL/100 g; and

STSA ranging from 160 to 220 m 2 /g;

(b) at least one polymeric dispersant selected from polyoxyethylene/polyoxypropylene block copolymers, styrene-acrylic resins, styrene-methacrylic resins, styrene-maleic acid copolymers, and styrene-maleic anhydride copolymers;

(c) at least one surfactant selected from ethoxylated siloxanes, succinic acid esters, and succinic acid salts; and

(d) at least one polyurethane, wherein the at least one polyurethane is prepared from a polyester polyol, a polyether polyol, a polyhydroxy polycarbonate, a polyhydroxy polyacetal, a polyhydroxy polyacrylate, a polyhydroxy polyester amide, a polyhydroxy polyolefin, a polyhydroxy polydialkylsiloxane, or a polyhydroxy polythioether.

27. The composition of claim 26 , wherein the at least one polyurethane is anionically self-stabilizing and has:

i) an acid number ranging from about 6 to about 70 mg KOH/g polyurethane; and

ii) a percentage by weight of polyol ranging from about 50% to about 90%.

28. An inkjet ink composition comprising:

(a) a carbon black having the following properties:

OAN≥170 mL/100 g; and

STSA ranging from 160 to 220 m 2 /g;

(b) at least one polymeric dispersant selected from polyoxyethylene/polyoxypropylene block copolymers, styrene-acrylic resins, styrene-methacrylic resins, styrene-maleic acid copolymers, and styrene-maleic anhydride copolymers;

(c) at least one surfactant selected from ethoxylated siloxanes, succinic acid esters, and succinic acid salts; and

(d) at least one polyurethane, wherein the carbon black and the at least one polyurethane are present in a weight ratio ranging from about 10/1 to about 1/2.

29. The composition of claim 1 , wherein the at least one polyurethane is anionically self-stabilizing and has:

i) an acid number ranging from about 6 to about 70 mg KOH/g polyurethane; and

ii) a percentage by weight of polyol ranging from about 50% to about 90%.