Pigment dispersions and inkjet ink compositions

1. An aqueous dispersion comprising:

pigment colorant particles that are present in an amount of at least 5 weight % and up to and including 80 weight %, based on the total weight of the aqueous dispersion;

a dispersing polymer that is a hexyloxy benzoic acid polymer; and

an aqueous medium,

wherein the weight ratio of the pigment colorant particles to the dispersing polymer is from 19:1 to and including 2:1,

wherein the pigment colorant particles are titanium dioxide particles that have a 95 th percentile particle size of less than 200 nm and a 50 th percentile particle size of less than 130 nm; and

the dispersing polymer has a weight average molecular weight of at least 5,000 and up to and including 100,000 and an acid value of at least 100 and up to and including 500.

2. The aqueous dispersion of claim 1 , wherein the weight ratio of the pigment colorant particles to the polymer is from 13:1 to and including 4:1.

3. The aqueous dispersion of claim 1 , wherein:

the weight ratio of the titanium dioxide particles to the dispersing polymer is from 9:1 to and including 5:1.

4. An aqueous inkjet ink composition, comprising:

pigment colorant particles that are present in an amount of at least 4 weight % and up to and including 15 weight %, based on the total weight of the aqueous inkjet ink composition;

a dispersing polymer that is a hexyloxy benzoic acid polymer;

a humectant having a molecular weight of less than 1,000; and

an aqueous medium,

wherein the weight ratio of the pigment colorant particles to the dispersing polymer is from 19:1 to and including 2:1,

the pigment colorant particles are titanium dioxide particles that have a 95 th percentile particle size of less than 200 nm and a 50 th percentile particle size of less than 130 nm;

the dispersing polymer has a weight average molecular weight of at least 5,000 and up to and including 100,000 and an acid value of at least 100 and up to and including 500, and

the aqueous inkjet ink composition is capable of providing a white printed image.

5. The aqueous inkjet ink composition of claim 4 , wherein the weight ratio of the titanium dioxide particles to the dispersing polymer is from 9:1 to and including 5:1.

6. The aqueous inkjet ink composition of claim 4 , wherein:

the weight ratio of the titanium dioxide particles to the dispersing polymer is from 13:1 to and including 4:1.

7. A method of inkjet printing, comprising:

providing a substrate,

ink jetting an aqueous inkjet ink composition from a main fluid supply as a continuous stream that is broken into both printing drops and non-printing drops, forming a white printed image on the substrate with the printing drops, and

collecting and returning the non-printing drops to the main fluid supply,

wherein the aqueous inkjet ink composition comprises:

pigment colorant particles that are present in an amount of at least 4 weight % and up to and including 15 weight %, based on the total weight of the aqueous inkjet ink composition;

a dispersing polymer that is a hexyloxy benzoic acid polymer;

a humectant having a molecular weight of less than 1,000; and

an aqueous medium,

wherein the weight ratio of the pigment colorant particles to the dispersing polymer is from 19:1 to and including 2:1;

the pigment colorant particles in the aqueous inkjet ink composition are titanium dioxide particles that have a 95 th percentile particle size of less than 200 nm and a 50 th percentile particle size of less than 130 nm;

the dispersing polymer in the aqueous inkjet ink composition has a weight average molecular weight of at least 5,000 and up to and including 100.000, and an acid value of at least 100 and up to and including 500.

8. The method of claim 7 , wherein the weight ratio of the pigment colorant particles to the dispersing polymer is from 13:1 to and including 4:1.