A liquid candle dye and a method for producing liquid candle dye related to the field of dye technology are provided, wherein the liquid candle dye by weight comprises: 40˜80 parts of an oil-soluble dye; 30˜80 parts of a solvent; and 10-20 parts of an auxiliary agent. The method for producing liquid candle dye of which a preparation method is as follows is provided: step 1: preparing materials according to any one of claims 1 to 3; step 2: soaking the oil-soluble dye in the solvent to dissolve; step 3: putting a soaked mixture in step 2 into a stirring device for stirring and then filtering; and step 4: adding the auxiliary agent to a filtered mixture in step 3, stirring evenly, and then forming a finished product.

Provided herein are hybrid pigments and methods of making the same. The hybrid pigments include a natural polyamide substrate and an acid dye disposed on the natural polyamide substrate. The hybrid pigments are biodegradable, compostable, or both, and provide an environmentally friendly alternative to synthetic polymer particle-based pigments.

An object of the present invention is to provide a method for producing a pigment composition that can efficiently reduce the number of coarse particles in a pigment composition such as an aqueous pigment dispersion. The inventors of the present invention have achieved this object by a method of producing a pigment composition for ink, including a processing step of crushing or cracking a pigment component in a raw material composition containing the pigment component and a liquid medium using a rotor-stator processing machine 100.

There are disclosed aqueous pigment dispersions containing dispersant-improving-agents, and methods of preparing and using the same.

There are disclosed aqueous pigment dispersions containing dispersant-improving-agents, and methods of preparing and using the same.

There are disclosed aqueous pigment dispersions containing dispersant-improving-agents, and methods of preparing and using the same.

An alkali-resistant pigment composition is provided comprising (a) a C.I. Pigment Yellow 139 and (b) an adduct containing a compound of formula (II) or a tautomeric form thereof, wherein X is O, S or NR.sup.1; Y is O, S or NR.sup.1; the group -A-B— is selected from the group consisting of —CR.sup.2═CR.sup.3-, —CR.sup.4R.sup.5—CR.sup.6R.sup.7-, —CY—CR.sup.8R.sup.9-, —CX—NR.sup.10-, —CR.sup.11═N—, —CR.sup.12R.sup.13-NR.sup.14- and R.sup.1 is hydrogen, C.sub.1-C.sub.8alkyl, C.sub.3-C.sub.7cycloalkyl, C.sub.6-C.sub.10aryl or C.sub.7-C.sub.10aralkyl; R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8, R.sup.9, R.sup.10, R.sup.11, R.sup.12, R.sup.13 and R.sup.14are independently of each other hydrogen, halogen, C.sub.1-C.sub.8alkyl, C.sub.2-C.sub.8alkenyl, or C.sub.6-C.sub.10aryl, or R.sup.2 and R.sup.3 form a benzoannellated ring; and/or a melamine- or pyrimidine-based compound, which is optionally substituted. The pigment composition may be used as colorant in various applications, especially in coloring high molecular weight organic material, for example, coating compositions, paints, printing inks, liquid inks, plastics, films or fibers.

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The present invention relates to a modified colorant comprising a colorant having at least one polymer attached or adsorbed thereto. The polymer comprises at least one functional group, and various embodiments of the functional group are disclosed. For each of these embodiments, preferably the functional group has a defined calcium index value. Also disclosed are various uses for these modified colorants, including inkjet ink compositions. Thus, the present invention further relates to an inkjet ink composition comprising a) a liquid vehicle, b) at least one colorant, and c) at least one polymer comprising at least one functional group as described herein.

A method for producing an aqueous pigment dispersion liquid, including: a kneading step of kneading a mixture of a quinacridone pigment (a), a pigment derivative (b), an organic high-molecular compound having an anionic group (c), a basic compound (d), and an acetylene glycol surfactant (e) in a closed kneader to prepare a pigment-kneaded material having a solid content in the range of 50% to 80% by mass; and a step of diluting the pigment-kneaded material with an aqueous medium. A method for producing a water-based ink for ink jet recording, including a step of diluting the aqueous pigment dispersion liquid with an aqueous medium.

A pigment composition is provided comprising (a) an organic pigment and (b) an adduct containing a compound of formula (I) or a tautomeric form thereof, wherein X is O or S; Y is O, S or NR.sup.1; the group -A-B— is selected from the group consisting of —CR.sup.2═CR.sup.3—, —CR.sup.4R.sup.5—CR.sup.6R.sup.7— —CY—CR.sup.8R.sup.9—, —CX—NR.sup.10—, —CR.sup.11═N—, —CR.sup.12R.sup.13—NR.sup.14— and R.sup.1 is hydrogen, C.sub.1-C.sub.8alkyl, C.sub.3-C.sub.7cycloalkyl, C.sub.6-C.sub.10aryl or C.sub.7-C.sub.10aralkyl; R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8, R.sup.9, R.sup.10, R.sup.11, R.sup.12, R.sup.13 and R.sup.14 are independently of each other hydrogen, halogen, C.sub.1-C.sub.8alkyl, C.sub.2-C.sub.8alkenyl or C.sub.6-C.sub.10aryl, or R.sup.2 and R.sup.3 form a benzoannellated ring; and/or a melamine- or pyrimidine-based compound, which is optionally substituted. The pigment composition may be used as colorant in various applications, especially in coloring high molecular weight organic material, for example, coating compositions, paints, printing inks, liquid inks, plastics, films or fibers.

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