Abstract: There is provided an inkjet ink comprising a photo-acid generating agent which is capable of generating an acid as it is irradiated with light, a color component, and an acid-polymerizable compound which can be polymerized in the presence of an acid, wherein at least 40% of the acid-polymerizable solvent is a vinyl ether compound represented by the following general formula (1): R13—R14—(R13)p??(1) (Wherein R13(s) is a group selected from the group consisting of a vinyl ether group, a group having a vinyl ether skeleton, an alkoxy group, substituted hydroxyl group and hydroxyl group wherein at least one of R13(s) is vinyl ether group or a group having a vinyl ether skeleton, R14 is a group comprising a substituted or unsubstituted cyclic skeleton and having a valence of (p+1), and p is a positive integer including zero).

Abstract: An inkjet ink is provided, which includes a solvent and a pigment having an average particle diameter of not larger than 250 nm. The number of flocculates of pigment particles having a diameter of 1 ?m or more is 1.6×108/cm3 or less.

Abstract: There is disclosed a liquid ink including a photo acid generating agent that generates an acid upon irradiation with light, a coloring component, and at least one kind of a solvent that is polymerized in the presence of an acid. It is preferable that the amount of the photo acid generating agent contained in the liquid ink falls within a range of between 1 part by weight and 10 parts by weight relative to 100 parts by weight of the solvent, the coloring component consists of a pigment, and the solvent contains at least 50 parts by weight of an acid polymerizable compound, the acid polymerizing compound polymerizing in the presence of the acid, having an alicyclic skeleton and/or an aliphatic skeleton having a viscosity of 50 mPa·s or less and a boiling point of 150° C. or more under room temperature and atmospheric pressure.

Abstract: There is disclosed a liquid ink including a photo acid generating agent that generates an acid upon irradiation with light, a coloring component, and at least one kind of a solvent that is polymerized in the presence of an acid. It is preferable that the amount of the photo acid generating agent contained in the liquid ink falls within a range of between 1 part by weight and 10 parts by weight relative to 100 parts by weight of the solvent, the coloring component consists of a pigment, and the solvent contains at least 50 parts by weight of an acid polymerizable compound, the acid polymerizing compound polymerizing in the presence of the acid, having an alicyclic skeleton and/or an aliphatic skeleton having a viscosity of 50 mPa·s or less and a boiling point of 150° C. or more under room temperature and atmospheric pressure.

Abstract: There is disclosed a liquid ink including a photo acid generating agent that generates an acid upon irradiation with light, a coloring component, and at least one kind of a solvent that is polymerized in the presence of an acid. It is preferable that the amount of the photo acid generating agent contained in the liquid ink falls within a range of between 1 part by weight and 10 parts by weight relative to 100 parts by weight of the solvent, the coloring component consists of a pigment, and the solvent contains at least 50 parts by weight of an acid polymerizable compound, the acid polymerizing compound polymerizing in the presence of the acid, having an alicyclic skeleton and/or an aliphatic skeleton having a viscosity of 50 mPa·s or less and a boiling point of 150° C. or more under room temperature and atmospheric pressure.

Abstract: There is disclosed a liquid ink including a photo acid generating agent that generates an acid upon irradiation with light, a coloring component, and at least one kind of a solvent that is polymerized in the presence of an acid. It is preferable that the amount of the photo acid generating agent contained in the liquid ink falls within a range of between 1 part by weight and 10 parts by weight relative to 100 parts by weight of the solvent, the coloring component consists of a pigment, and the solvent contains at least 50 parts by weight of an acid polymerizable compound, the acid polymerizing compound polymerizing in the presence of the acid, having an alicyclic skeleton and/or an aliphatic skeleton having a viscosity of 50 mpa·s or less and a boiling point of 150° C. or more under room temperature and atmospheric pressure.

Abstract: An inkjet ink is provided, which includes a pigment dispersion containing an organic dispersant, a black pigment having an average particle diameter of not more than 200 nm, and a resinous dispersing agent, the organic dispersant being formed of at least one polymerizable compound, and the black pigment being included therein at an amount ranging from 2 to 30% by weight based on the organic dispersant, and an ionic compound. A ?-potential of the black pigment to the at least one polymerizable compound of the organic dispersant is confined within the range of ?10 mV to +100 mV.

Abstract: A dispersion for ink is provided, which includes a dispersion medium, powder or pigment having an average particle diameter of not more than 300 nm, a polymer dispersing agent containing a first resinous dispersing agent and a second resinous dispersing agent, and an ionic compound. A mixing amount of the powder or pigment is 2% to 60% based on a total weight of the dispersion medium, a mixing amount of the first resinous dispersing agent is 1% to 60% based on a total weight of the powder or pigment, the second resinous dispersing agent is a resin having a basic terminal and a mixing amount of the second resinous dispersing agent is 1% to 30% based on a total weight of the powder or pigment, and a mixing amount of the ionic compound is 0.01% to 40% based on a total weight of the dispersion medium.

Abstract: Disclosed is a method of exposure-curing an ink layer formed on a recording medium. The layer is made of an ink comprising at least one solvent polymerizable by an acid, a photo-acid generating agent capable of generating the acid as irradiated with light, and a colorant component. This method comprises two irradiation steps. In the first irradiation, the ink layer is irradiated with light by using a light source having a first peak illuminance. The acid is thereby generated from the photo-acid generating agent. The diffusion of the acid is promoted in the layer, curing the ink layer to some extent. In the second irradiation, the ink layer is irradiated with light by using a light source having a second peak illuminance higher than the first peak illuminance. More acid is generated from the photo-acid generating agent and diffuses in the layer, completely curing the ink layer.

Abstract: There is proposed a method of curing an electromagnetic radiation-curing type liquid composition comprising a solvent polymerizable in the presence of an acid, and a photo-acid generating agent which is dissolved in the solvent and capable of generating the acid when irradiated with electromagnetic radiation.

Abstract: There is proposed an inkjet ink composition comprising a pigment component to which a resin having a basic terminal is adsorbed, a photo-acid generating agent containing an onium salt, and at least one kind of solvent which can be polymerized under the presence of an acid. The content of multivalent salt included in the onium salt is not more than 20% by weight based on a total weight of onium salt, and the content of the pigment component is confined within the range of 3 to 41% by weight based on the ink composition.

Abstract: There is proposed an inkjet ink comprising a compound represented by the following general formula (1), a cationic photopolymerization initiator, a cationic photopolymerizable compound, and a pigment having an average particle diameter of 300 nm or less, wherein the cationic photopolymerization initiator is included at a ratio of 0.5% by weight to 8% by weight based on 100% by weight of the cationic photopolymerizable compound, and the inkjet ink has a viscosity of 50 mPa·sec or less at ordinary temperature, (wherein R is a monovalent organic group having 1 to 5 carbon atoms, R1 and R2 may be the same or different and are individually hydrogen atom or alkyl group, alkyl sulfonyl group or alkoxy group each having 1 to 3 carbon atoms).

Abstract: There is proposed a washing solution for washing an inkjet printer head which performs printing by feeding an ink comprising at least two kinds of polymerizable compounds each differing in viscosity, a photopolymerization initiator, and pigment. This washing solution is characterized in that it contains not less than 50 parts by weight of a polymerizable compound selected from the polymerizable compounds included in the ink and having a lowest viscosity among the polymerizable compounds, or not less than 50 parts by weight of a polymerizable compound having a viscosity of 30 mPa·sec or less at ordinary temperature.

Abstract: There is disclosed a liquid ink including a photo acid generating agent that generates an acid upon irradiation with light, a coloring component, and at least one kind of a solvent that is polymerized in the presence of an acid. It is preferable that the amount of the photo acid generating agent contained in the liquid ink falls within a range of between 1 part by weight and 10 parts by weight relative to 100 parts by weight of the solvent, the coloring component consists of a pigment, and the solvent contains at least 50 parts by weight of an acid polymerizable compound, the acid polymerizing compound polymerizing in the presence of the acid, having an alicyclic skeleton and/or an aliphatic skeleton having a viscosity of 50 mPa·s or less and a boiling point of 150° C. or more under room temperature and atmospheric pressure.

Abstract: There is disclosed a liquid ink including a photo acid generating agent that generates an acid upon irradiation with light, a coloring component, and at least one kind of a solvent that is polymerized in the presence of an acid. It is preferable that the amount of the photo acid generating agent contained in the liquid ink falls within a range of between 1 part by weight and 10 parts by weight relative to 100 parts by weight of the solvent, the coloring component consists of a pigment, and the solvent contains at least 50 parts by weight of an acid polymerizable compound, the acid polymerizing compound polymerizing in the presence of the acid, having an alicyclic skeleton and/or an aliphatic skeleton having a viscosity of 50 mpa·s or less and a boiling point of 150° C. or more under room temperature and atmospheric pressure.

Abstract: There is disclosed a liquid ink including a photo acid generating agent that generates an acid upon irradiation with light, a coloring component, and at least one kind of a solvent that is polymerized in the presence of an acid. It is preferable that the amount of the photo acid generating agent contained in the liquid ink falls within a range of between 1 part by weight and 10 parts by weight relative to 100 parts by weight of the solvent, the coloring component consists of a pigment, and the solvent contains at least 50 parts by weight of an acid polymerizable compound, the acid polymerizing compound polymerizing in the presence of the acid, having an alicyclic skeleton and/or an aliphatic skeleton having a viscosity of 50 mPa.s or less and a boiling point of 150° C. or more under room temperature and atmospheric pressure.

Abstract: There is provided an inkjet ink comprising a photo-acid generating agent which is capable of generating an acid as it is irradiated with light, a color component, and an acid-polymerizable compound which can be polymerized in the presence of an acid, wherein at least 40% of the acid-polymerizable solvent is a vinyl ether compound represented by the following general formula (1): R13—R14—(R13)p ??(1) (Wherein R13(s) is a group selected from the group consisting of a vinyl ether group, a group having a vinyl ether skeleton, an alkoxy group, substituted hydroxyl group and hydroxyl group wherein at least one of R13(s) is vinyl ether group or a group having a vinyl ether skeleton, R14 is a group comprising a substituted or unsubstituted cyclic skeleton and having a valence of (p+1), and p is a positive integer including zero).

Abstract: There is disclosed an ink for ink jet recording, comprising a photo-acid generating agent which is capable of generating an acid as it is irradiated with light, a colorant, and an acid-polymerizable solvent which can be polymerized in the presence of an acid. In this ink, the content of the photo-acid generating agent is not less than 2.5 [5] parts by weight per 100 parts by weight of the acid-polymerizable solvent, and the acid-polymerizable solvent comprises an aliphatic epoxy compound represented by the following general formula (1) and an oxetane ring-containing compound: R1-CH2—C CH3)2—CH2—R1 ??(1) (wherein R1 is glycidyl ether group).

Abstract: There is provided a pigment dispersion comprising at least one resin-coated pigment comprising a resin and a pigment, and having an average particle diameter of 250 nm or less, and a dispersion medium containing as a major component a cation polymeric compound having a viscosity of 30 mPa.s or less at a temperature of 25° C. and a boiling point of 150° C. or more at 1 atm. The pigment is incorporated in the pigment dispersion at a ratio ranging from 3 to 41% by weight based on a total weight of the dispersion medium, and the resin is incorporated in the resin-coated pigment at a ratio ranging from 5 to 37% by weight based on the weight of the pigment.

Abstract: There is disclosed an ink jet recording apparatus comprising a color ink container having a capacity V1 accommodating therein a solvent polymerizable in the presence of an acid and a colorant, a reaction liquid container having a capacity V2 (V2<V1) accommodating therein a reaction liquid comprising a solvent, and a photo-acid generating agent capable of generating an acid when irradiated with light, an stirring container mixing the color ink and the reaction liquid at a mixing ratio of S1:S2 (the color ink:the reaction liquid) to prepare a recording ink, a color ink supply means feeding the color ink to the stirring container, a reaction liquid supply means feeding the reaction liquid to the stirring container, an ink jet recording head ejecting the recording ink to a recording medium, and a supply tube feeding the recording ink to the recording head.