Patent ID: 11866601
Assignee: SEIKO EPSON CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. An ink set comprising:
an ink composition; and
a treatment liquid composition,
wherein
each of the ink composition and the treatment liquid composition is used for printing by being applied onto a printing medium by an ink jet method,
the ink composition is a water-based composition containing a coloring material and a surfactant,
the treatment liquid composition is a water-based composition containing a flocculant and a surfactant,
each of the surfactant contained in the ink composition and the surfactant contained in the treatment liquid composition includes a silicone surfactant whose 0.1 mass % aqueous solution has a surface tension of 32 mN/m or less,
any one of the surfactant contained in the ink composition and the surfactant contained in the treatment liquid composition includes a silicone surfactant whose 0.1 mass % solution in a nitrogen-containing solvent has a surface tension of 32 mN/m or less,
any one of the ink composition and the treatment liquid composition contains any one of a nitrogen-containing solvent, a sulfur-containing solvent, and a cyclic ester, and
any one of the ink composition and the treatment liquid composition contains a nitrogen-containing solvent represented by any one of following formulas (1), (3) and (4):, wherein R1 and R2 each independently represent one selected from the group consisting of a hydrogen atom and alkyl groups with 1 to 5 carbon atoms, and R3 represents an alkyl group with 1 to 5 carbon atoms;, wherein R1 and R2 each independently represent one selected from the group consisting of a hydrogen atom and alkyl groups with 1 to 5 carbon atoms, and R3 represents an alkyl group with 1 to 5 carbon atoms;, wherein R1 represents one selected from the group consisting of a hydrogen atom and an alkyl or alkenyl group with 1 to 6 carbon atoms, and R2 represents an alkylene group with 1 to 6 carbon atoms that is a part of a cyclic amide ring.