[Problems] An object of the present invention is to provide: a thermochromic color-memory composition which effectively expresses a property of being able to interchangeably memorize and retain colors and which is thus applicable to various fields; and a thermochromic color-memory microcapsule pigment encapsulating the same. [Solution] Provided is a thermochromic color-memory composition including: (a) an electron-donating color-developing organic compound; (b) an electron-accepting compound; and (c) an ester compound represented by the following Formula (1), as a reaction medium which controls color reaction between the component (a) and the component (b): ##STR00001##
(wherein, R represents an alkyl group having 3 to 18 carbon atoms, a cycloalkylalkyl group having 6 to 11 carbon atoms, a cycloalkyl group having 5 to 7 carbon atoms or an alkenyl group having 3 to 18 carbon atoms; each X independently represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 3 carbon atoms or a halogen atom; and each Y independently represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a methoxy group, an ethoxy group or a halogen atom).

Provided is a gardenia pigment preparation that can stably maintain a dissolved state of gardenia blue pigment in an acidic range. The gardenia pigment preparation comprises gardenia blue pigment and lecithin.

[Problems] An object of the present invention is to provide: a thermochromic color-memory composition which effectively expresses a property of being able to interchangeably memorize and retain colors and which is thus applicable to various fields;

and a thermochromic color-memory microcapsule pigment encapsulating the same.

[Solution] Provided is a thermochromic color-memory composition including: (a) an electron-donating color-developing organic compound; (b) an electron-accepting compound; and (c) an ester compound represented by the following Formula (1), as a reaction medium which controls color reaction between the component (a) and the component (b):

##STR00001##

(wherein, R represents an alkyl group having 3 to 18 carbon atoms, a cycloalkylalkyl group having 6 to 11 carbon atoms, a cycloalkyl group having 5 to 7 carbon atoms or an alkenyl group having 3 to 18 carbon atoms; each X independently represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 3 carbon atoms or a halogen atom; and each Y independently represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a methoxy group, an ethoxy group or a halogen atom).

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.

Zirconium doped terbium nano oxides (ZrTb.sub.2O.sub.3). The nano oxides can have an average diameter ranging from about 17 nm to about 22 nm. The nano oxides can be used as a photocatalyst for photodegradation of organic dyes. In an embodiment, the organic dyes include textile wastewater dyes. In an embodiment, the textile wastewater dyes include methylene blue (MB) and/or Congo Red (CR). In an embodiment, the zirconium doped terbium nano oxides (ZrTb.sub.2O.sub.3) can be prepared by a dual co-precipitation and calcination method.

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.

The present invention relates to a modified colorant comprising a colorant having attached at least one organic group. Various embodiments of the organic group are disclosed. For each of these embodiments, preferably the organic group has a defined calcium index value. Also disclosed are various uses for these modified colorants, including inkjet ink compositions.

The present invention relates to a modified colorant comprising a colorant having attached at least one organic group. Various embodiments of the organic group are disclosed. For each of these embodiments, preferably the organic group has a defined calcium index value. Also disclosed are various uses for these modified colorants, including inkjet ink compositions.

An object of the present invention is to provide a gardenia blue pigment that can stably maintain the color tone even after heating under acidic conditions, and a method for producing the gardenia blue pigment. A gardenia blue pigment that can stably maintain the color tone even after heating under acidic conditions is obtained by carrying out the following first and second steps: the first step of reacting walnut peptide, bitter melon peptide, and/or soy peptide with genipin in a solvent without the supply of a gas containing oxygen; and the second step of treating the reaction solution obtained in the first step with the supply of a gas containing oxygen.

An isoindoline derivative of formula ##STR00001## wherein X is N, CCN or CCOR.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 CCN or CCOR.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.