Inkjet recording ink
AssigneeSeiko Epson Corporation
InventorsMasahiro Yatake, Motoki Masuda, Jyun Ito, Yasuhiro Oki, Hiroko Hayashi
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Abstract
The present invention aims to provide an ink for ink jet recording that is excellent in storage stability and discharge stability and attains high coloration on regular paper or gloss paper and high glossiness on gloss paper. The ink for ink jet recording of the invention includes: water; and a pigment dispersed by using a polymer which is obtained by polymerizing at least 50% by weight or more of benzylacrylate and 15% by weight or less of (meth)acrylic acid as components of the polymer and has an acid value of no less than 50 mgKOH/g and no more than 120 mgKOH/g and a weight average molecular weight of no less than 10000 and no more than 120000.
Claims30
An ink for ink jet recording comprising:
- water;
- at least one compound selected from the group consisting of 2,4,7,9-tetramethyl-5-decyne-4,7-diol, 3,6-dimethyl-4-octyne-3,6-diol, an alkylene oxide adduct of 2,4,7,9-tetramethyl-5-decyne-4,7-diol, and an alkylene oxide adduct of 3,6-dimethyl-4-octyne-3,6-diol, said compound being present in the ink in an amount of no less than 0.05% by weight and no more than 1% by weight;
- and
- a pigment dispersed by using a polymer which is obtained by polymerizing at least 50% by weight or more of benzyl acrylate and/or cyclohexyl acrylate and 15% by weight or less of (meth)acrylic acid as components of the polymer and has an acid value of no less than 50 mgKOH/g and no more than 120 mgKOH/g and a weight average molecular weight of no less than 20000 and no more than 120000 such that the polymer provides the ink with the capability of forming print on gloss paper having a glossiness value at 20° of at least 27.8%.
An ink set having at least a yellow ink, a magenta ink and a cyan ink, wherein each of the inks comprises:
- water;
- a pigment dispersed by using a polymer which obtained by polymerizing at least 50% by weight or more of benzyl acrylate and 15% by weight or less of (meth)acrylic acid as components of the polymer and has an acid value of no less than 50 mgKOH/g and no more than 120 mgKOH/g and a weight average molecular weight of no less than 20000 and no more than 120000,
- at least one compound selected from the group consisting of 2,4,7,9-tetramethyl-5-decyne-4,7-diol, 3,6-dimethyl-4-octyne-3,6-diol, an alkylene oxide adduct of 2,4,7,9-tetramethyl-5-decyne-4,7-diol, and an alkylene oxide adduct of 3,6-dimethyl-4-octyne-3,6-diol, said compound being present in the ink in an amount of no less than 0.05% by weight and no more than 1% by weight;
- wherein
- the yellow ink includes PY74 as a pigment, the magenta ink includes at least one selected from the group consisting of PV19, PR122, PR177 and PR254 as a pigment, and the cyan ink includes PB15:1 as a pigment.
Dependencies are inferred from the claim text.