Water base ink set for ink jet recording
First Claim
1. An ink set comprising at least a black ink, a yellow ink, a magenta ink, and a cyan ink,each of the inks comprising at least a colorant, a water-soluble cationic polymer having a primary amino group, and water, the colorant consisting of a coloring material(s) selected from the group consisting of anthraquinone, indigoid, phthalocyanine, carbonium, quinoneimine, methine, quinoline, nitro, nitroso, benzoquinone, naphthoquinone, naphthalimide, and perinone coloring materials.
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Accused Products
Abstract
An ink set is disclosed which comprises at least a black ink, a yellow ink, a magenta ink, and a cyan ink, each of the inks comprising at least a colorant, a water-soluble cationic polymer having a primary amino group in its molecule, and water, the colorant consisting of a coloring material(s) classified into categories of anthraquinone, indigoid, phthalocyanine, carbonium, quinoneimine, methine, quinoline, nitro, nitroso, benzoqulnone, naphthoquinone, naphthalimide, and perinone coloring materials. This ink set can realize a full-color image having both good waterfastness and lightfastness. The coloring materials falling within the above categories, even when added, to the ink, in combination with a highly reactive polyallylamine having a primary amino group, can realize an image having good lightfastness while maintaining high waterfastness derived from the addition of the polyallylamine. Further, these colorants are not decomposed upon being attacked by the primary amino group of the polyallylamine and has excellent storage stability.
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Citations
14 Claims
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1. An ink set comprising at least a black ink, a yellow ink, a magenta ink, and a cyan ink,
each of the inks comprising at least a colorant, a water-soluble cationic polymer having a primary amino group, and water, the colorant consisting of a coloring material(s) selected from the group consisting of anthraquinone, indigoid, phthalocyanine, carbonium, quinoneimine, methine, quinoline, nitro, nitroso, benzoquinone, naphthoquinone, naphthalimide, and perinone coloring materials.
Specification