A polysiloxane-substituted quinacridone pigment is produced by a quinacridone pigment with an epoxy-terminated polysiloxane under conditions effective to cause the epoxy group on the polysiloxane to react with, and bond the polysiloxane to, the quinacridone pigment. The quinacridone pigment thus produced has the polysiloxane grouping bonded to one of the quinacridone nitrogen atoms via a hydrocarbon linking group, which bears a hydroxyl group on a carbon atom α or β to the quinacridone nitrogen atom. These quinacridone pigments are useful in electrophoretic displays.

A colorant-containing solid material (1) of the present invention includes a colorant (10) and a matrix (20). The matrix (20) is formed of a silica and a polysilsesquioxane and covers the colorant (10). An absorption intensity derived from a hydrocarbon group that is not directly bonded to a silicon atom, an absorption intensity derived from a bond between a silicon atom and a non-reactive functional group, and an absorption intensity derived from a bond between a silicon atom and a hydroxy group, determined by an infrared spectroscopic analysis based on a KBr pellet method using a Fourier transform infrared spectrophotometer, are denoted as Ia, Ib and Ic, respectively. The colorant-containing solid material (1) satisfies at least one of conditions Ib/Ia≥1.1 and Ib/Ic≥0.6.

Described herein is a polymeric pigment dispersant, a process for preparation of the polymeric pigment dispersant, and a pigment dispersion including the pigment dispersant that is used for coating and in printing ink, automotive basecoat, automotive clearcoat, mill base, furniture coatings, and wood coatings.

This disclosure relates to fugitive color systems and storage-stable fugitive colored liquid long-term fire retardant compositions comprising a fugitive color system. The fugitive color system comprises a fugitive color pigment. In particular, disclosed herein is the identification of fugitive color pigments exhibiting hydrophilic or diminished hydrophobic tendencies. And, in certain aspects, the fugitive color pigment is fluorescent.

For fluorescent nanoparticles having a zeta potential of −10 mV to −60 mV at pH 7.0 or a zeta potential of 0 mV to −10 mV in a buffer of pH 6.0 to 8.0, an appropriate electrical repulsive force can be generated between biomolecules that are generally negatively charged and the fluorescent nanoparticles. As a result, non-specific binding between the fluorescent nanoparticles and the biomolecules is suppressed and the fluorescent nanoparticles are specifically bound to a biomolecule to be stained through interaction stronger than the electrical repulsive force, so that the visibility of the specific biomolecule to be stained can be improved. Further, since an appropriate electrical repulsive force is also generated between the fluorescent nanoparticles themselves, aggregation of the fluorescent nanoparticles can be inhibited and the dispersibility in a staining solution can thereby be maintained.

An organic colorant complex with the following general structure:

AB.sub.n(DE).sub.mT.sub.xQ.sub.y

wherein A is an organic chromophore; B is an electrophilic reactive group covalently bonded to A directly or through a linking group; D is a nucleophilic linking group covalently bonding B and E, selected from the group consisting of NR, O, S, and 4-oxyanilino (—HN-Ph-O—); wherein R is selected from the group consisting of H, alkyl, aryl, and E; E is an organic alkyl and aryl group or an end group; T is an ionic group covalently linked to A; Q is an organic cation, bonded to the organic chromophore A through ionic interaction with T; n, m, x, and y are independent integers from 1 to 10.

A colorant-containing solid material (1) of the present invention includes a colorant (10) and a matrix (20). The matrix (20) is formed of a silica and a polysilsesquioxane and covers the colorant (10). An absorption intensity derived from a hydrocarbon group that is not directly bonded to a silicon atom, an absorption intensity derived from a bond between a silicon atom and a non-reactive functional group, and an absorption intensity derived from a bond between a silicon atom and a hydroxy group, determined by an infrared spectroscopic analysis based on a KBr pellet method using a Fourier transform infrared spectrophotometer, are denoted as Ia, Ib and Ic, respectively. The colorant-containing solid material (1) satisfies at least one of conditions Ib/Ia1.1 and Ib/Ic0.6.

Described herein are methods, compositions and articles of manufacture involving neutral conjugated polymers including methods for synthesis of neutral conjugated water-soluble polymers with linkers along the polymer main chain structure and terminal end capping units. Such polymers may serve in the fabrication of novel optoelectronic devices and in the development of highly efficient biosensors. The invention further relates to the application of these polymers in assay methods.

The present disclosure is drawn to aqueous pigment co-dispersions. The co-dispersions include self-dispersed pigment with a chemically modified surface; released surface moieties from the self-dispersing pigment; pigment powder having the released surface moieties associated with pigment powder surfaces; polymeric dispersant; and water.

Described herein are methods, compositions and articles of manufacture involving neutral conjugated polymers including methods for synthesis of neutral conjugated water-soluble polymers with linkers along the polymer main chain structure and terminal end capping units. Such polymers may serve in the fabrication of novel optoelectronic devices and in the development of highly efficient biosensors. The invention further relates to the application of these polymers in assay methods.