发明授权
US07878643B2 Aqueous ink, ink jet recording method, ink cartridge, recording unit, and ink jet recording apparatus 有权
水性墨水,喷墨记录方法,墨盒,记录单元和喷墨记录装置

Aqueous ink, ink jet recording method, ink cartridge, recording unit, and ink jet recording apparatus
摘要:
An aqueous ink contains at least an aqueous medium, a surfactant, and a dye. The aqueous medium includes only water and at least one water-soluble organic compound(s) and the static surface tension of the aqueous medium is from 45 mN/m or more to 57 mN/m or less. The dynamic surface tension of the aqueous ink satisfies the following conditions: (1) The dynamic surface tension of the aqueous ink at a lifetime of 50 milliseconds is from 42 mN/m or more to less than 49 mN/m; (2) The dynamic surface tension of the aqueous ink at a lifetime of 500 milliseconds is from 28 mN/m or more to 38 mN/m or less; and (3) A difference between the dynamic surface tension of the aqueous ink at a lifetime of 50 milliseconds and the dynamic surface tension of the aqueous ink at a lifetime of 500 milliseconds is 7 mN/m or more.
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