US Patent No. 10,428,233

WATER-BASED INK SET FOR INK-JET PRINTING


Patent No. 10,428,233
Issue Date October 01, 2019
Title Water-based Ink Set For Ink-jet Printing
Inventorship Yuka Tsuzaka, Nagoya (JP)
Shinpei Ito, Nagoya (JP)
Mitsunori Maeda, Nagoya (JP)
Assignee Brother Kogyo Kabushiki Kaisha, Nagoya-shi, Aichi-ken (JP)

Claim of US Patent No. 10,428,233

1. A water-based ink set for ink-jet recording, wherein the water-based ink set comprises:a water-based yellow ink containing a yellow pigment, a resin dispersant, and water;
a water-based magenta ink containing a magenta pigment, a resin dispersant, and water;
a water-based cyan ink containing a cyan pigment, a resin dispersant, and water;
a water-based black ink containing self-dispersible carbon black and water,
wherein the self-dispersible carbon black has an average particle size of 120 to 170 nm, and
the water-based color ink selected from the group consisting of the water-based yellow ink, the water-based magenta ink, and the water-based cyan ink which contains a color pigment of which average particle size is largest among the yellow pigment, the magenta pigment, and the cyan pigment, further contains a dye, and the remaining two water-based color inks contain no dye.