Method for producing electrostatic image developing toner

1 . A method for producing an electrostatic image developing toner, the method comprising:

a step 1 of producing toner particles by a wet process, the toner particles including an amorphous polyester resin, a crystalline polyester resin, and a vinyl resin; and

a step 2 of bringing acidic water, consisting of an aqueous solution of a monovalent acid having a pKa in water at 25° C. of −10 or more and 4.5 or less, and having an acid concentration of 0.5 mmol/L or more and 8 mmol/L or less measured prior to contact with the toner particles, into contact with the toner particles, wherein the step 2 reduces a sodium content on surfaces of the toner particles.

2 . The method for producing an electrostatic image developing toner according to claim 1 ,

wherein a drop from a Na content in surfaces of the toner particles that have not been subjected to the step 2 (Na contentBefor) to a Na content in the surfaces of the toner particles that have been subjected to the step 2 (Na contentAfter) is 0.10 mg/L or more and 2.0 mg/L or less, and

wherein the Na content in the surfaces of the toner particles that have been subjected to the step 2 (Na contentAfter) is 0.05 mg/L or more and 0.4 mg/L or less.

3 . The method for producing an electrostatic image developing toner according to claim 1 , the method further comprising:

a step 3 of, subsequent to the step 2, bringing wash water B into contact with the toner particles,

wherein a rise from an anion content in the surfaces of the toner particles that have not been subjected to the step 2 (anion contentBefor) to an anion content in the surfaces of the toner particles that have been subjected to the step 2 (anion contentAfter2) is 1 mg/L or more and 5 mg/L or less, and

wherein an anion content in the surfaces of the toner particles that have been subjected to the step 3 (anion contentAfter3) is 0.001 mg/L or more and 0.1 mg/L or less.

4 . The method for producing an electrostatic image developing toner according to claim 1 ,

wherein the acidic water having an acid concentration of 0.5 mmol/L or more and 8 mmol/L or less has a temperature of 35° C. or less.

5 . The method for producing an electrostatic image developing toner according to claim 1 ,

wherein the acidic water is an aqueous nitric acid solution.

6 . The method for producing an electrostatic image developing toner according to claim 1 , the method further comprising:

a step of, prior to the step 2, bringing wash water A into contact with the toner particles.

7 . The method for producing an electrostatic image developing toner according to claim 6 ,

wherein a mass of the wash water A is 150% by mass or more and 2,000% by mass or less of a total mass of the toner particles.

8 . The method for producing an electrostatic image developing toner according to claim 1 ,

wherein a mass of the crystalline polyester resin included in the toner particles is 10% by mass or more and 30% by mass or less of a total mass of the toner particles.