Water-based ink set for ink-jet recording

Details Water-based ink set for ink-jet recording Water-based ink set for ink-jet recording

2006-07-26

2009-10-20

Shah, Manish S (Department: 2853)

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

C106S031130

Reexamination Certificate

active

07604340

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:in-line-formulae description="In-line Formulae" end="lead"?σ1000Bk≧35 mN/m;  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?|σ30Y−σ30Bk|≦5 mN/m;  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?σ30M≧30 mN/m, σ30C≧30 mN/m;  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?σ30Y>σ30M, σ30Y>σ30C; and  (4)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?σ30Y+σ30M≦93 mN/m, σ30Y+σ30C≦93 mN/m,  (5)in-line-formulae description="In-line Formulae" end="tail"?wherein σ30Bk, σ30Y, σ30Mand σ30Care 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 σ1000Bkis 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.

REFERENCES:
patent: 55 65269 (1980-05-01), None
patent: 2006063322 (2006-03-01), None

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