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.

Disclosed is a lycopene food colorant having a fresh-keeping function. The food colorant is prepared from the following raw materials in parts by weight: 1-3 parts of a lycopene crystal, 5-20 parts of an emulsifier, 0.5-5 parts of an antioxidant, 60-70 parts of glycerol, and 10-20 parts of water. The food colorant is prepared by mixing the raw materials and then emulsifying and grinding same. The granularity of the obtained lycopene colorant is moderate; the tone is suitable for coloring a minced fillet product; the lycopene colorant has high tinting strength, achieves a bright color, and has the effect of triggering myoglobin, so that the minced fillet product has a bright color and appears fresher; the lycopene colorant further has a fresh-keeping function and can kill some food microorganisms, so as to keep food fresh and prolong the shelf life.

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.

Provided are a polycarbonate resin composition comprising a polycarbonate resin, pentaerythritol tetrastearate, a black dye, and a blue dye, and an optical molded product comprising same.

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.

An isoindoline derivative of formula

##STR00001##

wherein
X is N, C—CN or C—COR.sup.2;
Y is a radical having an acidic group or a basic group;
R.sup.1 is independently from one another halogen or C.sub.1-C.sub.4-alkyl, said alkyl is unsubstituted or substituted with halogen;
R.sup.2 is C.sub.1-C.sub.4-alkyl, said alkyl is unsubstituted or substituted with halogen; and
n is 0, 1, 2, 3 or 4,
with the proviso that Y does not include an acidic group if X is C—CN or C—COR.sup.2, and compositions containing the same are provided. The isoindoline derivative and the pigment composition are suitable, for example, for coloring high molecular mass organic material, especially paints, printing inks, resist formulations for color filter applications, electrophotographic toners, cosmetics, plastics, films or fibers.

A pigment composition including at least one pigment selected from the group consisting of a perinone-based pigment and a perylene-based pigment, water, a resin having a constitutional unit represented by Formula 1, and at least one compound selected from the group consisting of a phthalimide compound having a carboxyalkyl group and a naphthalimide compound having a carboxyalkyl group; a method for producing thereof; and an aqueous ink composition using the pigment composition. In Formula 1, R.sup.1 represents a hydrogen atom or a methyl group, L.sup.2 represents —C(═O)O—, —OC(═O)—, or —C(═O)NR.sup.2— and R.sup.2 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R.sup.3 represents an alkyl group having 6 or more carbon atoms. ##STR00001##

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.