Patent ID: 11866599
Assignee: DAI NIPPON TORYO CO., LTD.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC C  B | IPC B  C

Claim 0:
1. An ink set, comprising: a water-based coloring ink and a water-based coating liquid having an acting of aggregating the water-based coloring ink, wherein
the water-based coloring ink comprises water in a range of 50% by mass to 90% by mass, a pigment in a range of 0.5% by mass to 10% by mass, a water-soluble solvent in a range of 5% by mass to 49% by mass, and a resin in a range of 1% by mass to 10% by mass, the water-based coloring ink may further comprise a surface conditioner, and the resin in the water-based coloring ink comprises a self-dispersible urethane resin,
the water-based coating liquid comprises water in a range of 50% by mass to 90% by mass, a water-soluble solvent in a range of 5% by mass to 49% by mass, and a resin in a range of 0.005% by mass to 15% by mass, wherein
the water-based coating liquid comprises an amine compound selected from the group consisting of N-methyldiethanolamine, N-ethyldiethanolamine, N,N-dimethylethanolamine, and N,N-diethylethanolamine,
the water-based coating liquid optionally comprises a surface conditioner,
the water-soluble solvent in the water-based coating liquid comprises a diol compound and/or a glycol ether compound, and
the resin in the water-based coating liquid comprises a water-soluble polymer having a cation,

a dynamic surface tension value at 25° C. at a surface life of 100 ms of the water-based coating liquid is smaller than a dynamic surface tension value at 25° C. at a surface life of 100 ms of the water-based coloring ink,
a difference between the dynamic surface tension value at 25° C. at a surface life of 100 ms of the water-based coating liquid and the dynamic surface tension value at 25° C. at a surface life of 100 ms of the water-based coloring ink is 7 mN/m or more and 20 mN/m or less, and
the dynamic surface tension value at 25° C. at a surface life of 100 ms of the water-based coating liquid is within a range of 20 to 30 mN/m.