Water-based ink set for ink-jet recording

Abstract

Provided is a water-based ink set for ink-jet recording for reducing bleeding between a black (Bk) ink and a yellow (Y) ink and for reducing color unevenness in a portion formed by color mixing of color inks. The water-based ink set for ink-jet recording includes at least a Bk ink, a Y ink, a magenta (M) ink and a cyan (C) ink. In this configuration, the following relationships are satisfied: σ1000Bk≧35 mN/m;  (1) |σ30Y−σ30Bk|≦5 mN/m;  (2) σ30M≧30 mN/m, σ30C≧30 mN/m;  (3) σ30Y>σ30M, σ30Y>σ30C; and  (4) σ30Y+σ30M≦93 mN/m, σ30Y+σ30C≦93 mN/m,  (5) wherein σ30Bk, σ30Y, σ30M and σ30C are dynamic surface tensions of the Bk ink, the Y ink, the M ink and the C ink, respectively, at a lifetime of 30 ms as measured by a maximum bubble pressure method at a measurement temperature of 25° C., and σ1000Bk is a dynamic surface tension of the black ink at a lifetime of 1,000 ms as measured by the maximum bubble pressure method at a measurement temperature of 25° C.

Dependencies are inferred from the claim text.