Ink set and method for recording printed matter
AssigneesToyo Ink Sc Holdings Co., Ltd., Toyocolor Co., Ltd.
InventorsMayuko Hayamizu, Atsushi Yoda, Kazuhiro Jonai
Life of this patent
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Abstract
An ink set including an inkjet ink, and a treatment liquid used in combination with the inkjet ink, wherein the inkjet ink includes a pigment, a water-soluble organic solvent, a surfactant and water, the treatment liquid includes a coagulant, an organic solvent and water, the coagulant includes calcium nitrate in an amount of 21.5 to 41.7% by mass relative to the total mass of the treatment liquid, an amount of organic solvent having a boiling point at one atmosphere of 240° C. or higher in the treatment liquid is not more than 8% by mass, a pH of the treatment liquid is within a range from 3.5 to 10.5, and a viscosity of the treatment liquid at 25° C. is within a range from 5.5 to 18.5 mPa·s.
Claims10
An ink set comprising an inkjet ink, and a treatment liquid used in combination with the inkjet ink, wherein
- the inkjet ink comprises a pigment, a water-soluble organic solvent, a surfactant and water,
- the treatment liquid comprises a coagulant, an organic solvent, a binder resin, and water,
- the coagulant comprises calcium nitrate in an amount of 24.3 to 34.7% by mass relative to the total mass of the treatment liquid, and the amount of calcium nitrate is calculated in terms of anhydrous calcium nitrate,
- an amount of organic solvent having a boiling point at one atmosphere of 240° C. or higher in the treatment liquid is not more than 8% by mass,
- the binder resin contains at least one resin selected from the group consisting of polyvinyl alcohols having a degree of saponification of at least 95%, (meth)acrylic resins having an acid value of not more than 100, and styrene-(meth)acrylic resins having an acid value of not more than 100, and
- a pH of the treatment liquid is within a range from 3.5 to 10.5, and a viscosity of the treatment liquid at 25° C. is within a range from 5.5 to 18.5 mPa s.
The ink set according to Clam 1, wherein
- the inkjet ink also comprises a resin, and
- an amount of the resin, relative to a solid fraction of the inkjet ink, is within a range from 30% by mass to 90% by mass.
Dependencies are inferred from the claim text.