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AssigneeCanon Kabushiki Kaisha
InventorsTakahiro Mori, Satoru Kobayashi, Shinichi Sakurada, Yutaka Kurabayashi
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An ink jet ink containing a coloring material and a polymer particle, wherein the polymer particle has a core portion and a shell portion, the shell portion contains a copolymer A having a unit derived from a compound (a1) represented by a general formula (1) of R1—(C2H4O)n—R2 where R1 is at least one selected from a vinyl group, an allyl group, an acryloyl group and a methacryloyl group, R2 is a hydrogen atom or an alkyl group, and n is 30-100, and a unit derived from an α,β-unsaturated hydrophobic compound (a2), a proportion of the unit derived from the compound (a1) to the copolymer A is 50-90% by mass or less, a proportion of the unit derived from the compound (a2) to the copolymer A is 10-50% by mass or less, and the core portion contains a polymer of an α,β-unsaturated hydrophobic compound (b).
An ink jet ink comprising a coloring material and a polymer particle, wherein
A polymer particle used in an ink jet ink, wherein
Dependencies are inferred from the claim text.
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About 6 years 4 months of term left · ends 21 Feb 2033 (estimated)
Inkjet printing inks: characterised by non-macromolecular additives other than solvents, pigments or dyes
Ink supply systems ; Circuit parts therefor: ink cartridges
For multi-colour printing: characterised by the ink properties
On to polymers of esters: polymerisation of acrylate or methacrylate esters on to polymers thereof
1. Field of the Invention
The present invention relates to an ink jet ink, and an ink cartridge and an ink jet recording method using such an ink, and a polymer particle used in such an ink.
2. Description of the Related Art
Preferred embodiments of the present invention will now be described in detail. Incidentally, “(meth)acrylic acid” and “(meth)acrylate” hereinafter mean “acrylic acid” and “methacrylic acid”, as well as “acrylate” and “methacrylate”, respectively.
The present inventors have investigated the cause of the lowered ejection stability of the ink containing the polymer particle synthesized by using the polymer surfactant as described in Japanese Patent Application Laid-Open No. H09-267034. As a result, it has been found that the cause is that a polymer surfactant remaining without contributing to polymerization and a polymer surfactant separated from the polymer particle adhere to a face of a recording head (a face having an ejection orifice for ejecting the ink). Incidentally, this adhesion phenomenon of the polymer surfactant has occurred not only in a thermal ink jet system, but also in an ink jet system utilizing a piezo element. From the above, it has been found that the method using the polymer surfactant high in the defoaming properties improves the lowering of the ejection stability by the low defoaming properties, whereas the ejection stability of the ink is yet low due to a new problem derived from the polymer surfactant.
As described above, the cause of the lowered ejection stability of the ink in any of the ink using the polymer particle obtained by the conventional emulsion polymerization process using the surfactant and the ink using the polymer particle (Japanese Patent Application Laid-Open No. H09-267034) obtained by the emulsion polymerization process using the polymer surfactant has been that the surfactant remains in the polymer particle. Therefore, the present inventors have investigated a process for synthesizing a polymer particle without using a surfactant, thus leading to completion of the present invention.