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Ink set and image forming method

  • US 10,639,919 B2
  • Filed: 08/16/2017
  • Issued: 05/05/2020
  • Est. Priority Date: 08/31/2016
  • Status: Active Grant
First Claim
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1. An ink set, comprising:

  • an ink composition comprising a colorant and water;

    a pre-treatment liquid comprising an organic acidic compound containing a carboxy group, and water; and

    an overcoat liquid comprising water and particles of a resin, the resin comprising a first acidic group selected from the group consisting of a sulfo group, a salt of a sulfo group, a phosphonic acid group, a salt of a phosphonic acid group, a phosphoric acid group, and a salt of a phosphoric acid group,wherein the particles respectively comprise, in at least a part of a surface thereof, a surfactant comprising a second acidic group selected from the group consisting of a sulfo group, a salt of a sulfo group, a phosphonic acid group, a salt of a phosphonic acid group, a phosphoric acid group, and a salt of a phosphoric acid group,wherein a total content A of the first acidic group is in a range of from 0.10 mmol to 1.8 mmol per 1 g of the resin,wherein a total content B of the second acidic group is in a range of from 0.02 mmol to 0.30 mmol per 1 g of the resin, andwherein a ratio of the total content B to the total content A is in a range of from 0.1 to 0.8.

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