An ink for ink jet recording according to an embodiment is an ink for ink jet recording containing pigment, colloidal silica, and amino acid.

An ink for ink jet recording according to an embodiment is an ink for ink jet recording containing pigment, colloidal silica, and amino acid.

A usual ink composition can be expected to improve ink viscosity to a certain degree, but when used for a glycol ether-based ink recently required, an increase in viscosity in preparing the ink cannot be suppressed. In addition, there is unknown a copper phthalocyanine pigment composition which can satisfy both such an improvement in ink viscosity and resolubility as printability which is important for the glycol ether-based ink. In this situation, a problem to be solved by the present invention is to provide a copper phthalocyanine pigment composition having low viscosity and excellent resolubility in a glycol ether-based ink. It was found that when a copper phthalocyanine pigment is combined with a specified copper phthalocyanine acid derivative, a pigment composition having significantly low viscosity when formed into a glycol ether-based ink, and good familiarity with the ink can be produced, leading to the achievement of the present invention.

A usual ink composition can be expected to improve ink viscosity to a certain degree, but when used for a glycol ether-based ink recently required, an increase in viscosity in preparing the ink cannot be suppressed. In addition, there is unknown a copper phthalocyanine pigment composition which can satisfy both such an improvement in ink viscosity and resolubility as printability which is important for the glycol ether-based ink. In this situation, a problem to be solved by the present invention is to provide a copper phthalocyanine pigment composition having low viscosity and excellent resolubility in a glycol ether-based ink. It was found that when a copper phthalocyanine pigment is combined with a specified copper phthalocyanine acid derivative, a pigment composition having significantly low viscosity when formed into a glycol ether-based ink, and good familiarity with the ink can be produced, leading to the achievement of the present invention.

An ink set for ink jet recording that adheres ink to a heated recording medium includes first and second water-based ink compositions. The first water-based ink composition contains a first solid content including a first coloring material and a first organic solvent. The second water-based ink composition contains a second solid content including a second coloring material and a second organic solvent. The first ink composition contains 5% by mass or more of the first solid content than the second solid content contained in the second ink composition. The second ink composition contains 7% by mass or more of the second organic solvent than the first organic solvent contained in the first ink composition.

An ink set for ink jet recording that adheres ink to a heated recording medium includes first and second water-based ink compositions. The first water-based ink composition contains a first solid content including a first coloring material and a first organic solvent. The second water-based ink composition contains a second solid content including a second coloring material and a second organic solvent. The first ink composition contains 5% by mass or more of the first solid content than the second solid content contained in the second ink composition. The second ink composition contains 7% by mass or more of the second organic solvent than the first organic solvent contained in the first ink composition.

The present invention relates to an ink composition for an organic light emitting device that can be applied to an inkjet process. The ink composition comprises a compound represented by the following Chemical Formula 1, a first solvent of aromatic esters having a boiling point of 260 to 400° C., and a second solvent of aliphatic ethers or aliphatic esters having a boiling point of 200 to 400° C., wherein the boiling point of the first solvent is higher than that of the second solvent. When this is applied to an inkjet process, it can form a flat film with a smooth surface when dried after forming the ink film.

##STR00001##

wherein L, L.sub.1 to L.sub.4, Ar.sub.1, Ar.sub.2, R.sub.1 to R.sub.4, Y.sub.1 to Y.sub.4, and n.sub.1 to n.sub.4 are described herein.

The present invention relates to an ink composition for an organic light emitting device that can be applied to an inkjet process. The ink composition comprises a compound represented by the following Chemical Formula 1, a first solvent of aromatic esters having a boiling point of 260 to 400° C., and a second solvent of aliphatic ethers or aliphatic esters having a boiling point of 200 to 400° C., wherein the boiling point of the first solvent is higher than that of the second solvent. When this is applied to an inkjet process, it can form a flat film with a smooth surface when dried after forming the ink film.

##STR00001##

wherein L, L.sub.1 to L.sub.4, Ar.sub.1, Ar.sub.2, R.sub.1 to R.sub.4, Y.sub.1 to Y.sub.4, and n.sub.1 to n.sub.4 are described herein.

The present invention provides a polyester resin having a self-emulsifying function which is able to form an aqueous emulsion without using any emulsifier and organic solvent. The present invention also provides a water dispersion, an aqueous adhesive, an aqueous ink, a laminate and a packaging material containing the above polyester resin, as well as a method for preparing the water dispersion.

The present invention provides a polyester resin having a self-emulsifying function which is able to form an aqueous emulsion without using any emulsifier and organic solvent. The present invention also provides a water dispersion, an aqueous adhesive, an aqueous ink, a laminate and a packaging material containing the above polyester resin, as well as a method for preparing the water dispersion.