Abstract: In one embodiment, a polymer includes a repeating unit represented by a formula (1) shown below. A weight-average molecular weight of the polymer is in a range of 3000 or more to 1000000 or less. R1 indicates a monovalent group selected from hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aromatic group, and a substituted or unsubstituted hetero-aromatic group. R2, R3, and R4 indicate independently a monovalent group selected from hydrogen, halogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aromatic group, and a substituted or unsubstituted hetero-aromatic group. X, Y, and Z indicate independently an atom selected from O, S, and Se.

Abstract: [Object] To provide a polymer excellent enough in photoelectric conversion efficiency and in light resistance to be suitable for solar cells, also to provide a solar cell using the polymer, and further to provide an electronic product comprising the cell. [Means] Embodiments of the present disclosure provide a polymer comprising a repeating unit of the following formula (M1). (In the formula, R1 is a substituent group selected from the group consisting of alkyl groups, and alkoxy groups; each R2 is independently a substituent group selected from the group consisting of hydrogen, halogen, alkyl groups, alkoxy groups, and aryl groups; and each X is independently an atom selected from the group consisting of O, S and Se. The embodiments also provide a solar cell having an active layer containing the above polymer and further an electronic product comprising that cell.

Abstract: There is provided an emulsion coloring material which can be used on ordinary paper, has good color developability, and can be used for conventional erasable pens or printing inks of black or blue color, having sufficiently high densities. When use is made of an erasable emulsion coloring material capable of controlling color development and decolorization by the presence or absence of the interaction between a chromatic material and a color developer, the colored emulsion comprising a copolymer resin of at least one unit selected from styrene and styrene derivatives and at least one unit selected from an acrylic acid ester and a methacrylic acid ester having a substituent which comprises a carbon chain having 4 or more carbon atoms, coloring ability can be enhanced.

Abstract: According to one embodiment, decolorizable color developing particle includes 41 to 50% by mass of a color material relative to the total amount, while the rest being a binder. The color material contains an amount mL of a color developing compound and an amount mD (mD<mL) of a developer. Island portions rich in the color material are distributed within sea portion rich in the binder.

Abstract: According to one embodiment, a liquid ink includes a leuco dye, a developer, and a solvent. The developer is selected from wherein X1 is selected from H and CH3, X2 is selected from H and OH, X5 is selected from C(CH3)2 and CO, and X4 is selected from phenyl group and alkyl group.

Abstract: According to one embodiment, an erasable inkjet ink includes a leuco dye, a non-water-soluble developer, and a solvent containing an alcohol and water. The amount of the water is 7 to 25% by mass of the solvent.

Abstract: According to one embodiment, an erasable inkjet ink includes a leuco dye, a non-water-soluble developer, and a solvent containing an alcohol and water. The amount of the water is 7 to 25% by mass of the solvent.

Abstract: According to one embodiment, decolorizable color developing particle includes 41 to 50% by mass of a color material relative to the total amount, while the rest being a binder. The color material contains an amount mL of a color developing compound and an amount mD (mD<mL) of a developer. Island portions rich in the color material are distributed within sea portion rich in the binder.

Abstract: According to one embodiment, an image erasing apparatus decolors an image printed on a paper sheet using an ink containing at least a leuco dye, a developer, water, a water-soluble organic solvent, and a surfactant. The image erasing apparatus includes a heating unit, a feedback mechanism, and a control unit. The heating unit heats the paper sheet. The feedback mechanism supplies the paper sheet heated by the heating unit to the heating unit again. The control unit causes the feedback mechanism to supply the paper sheet to the heating unit a plurality of times so as to heat the paper sheet a plurality of times.

Abstract: According to one embodiment, a liquid ink includes a leuco dye, a developer, and a solvent. The developer is selected from wherein X1 is selected from H and CH3, X2 is selected from H and OH, X5 is selected from C(CH3)2 and CO, and X4 is selected from phenyl group and alkyl group.

Abstract: According to one embodiment, an image erasing apparatus decolors an image printed on a paper sheet using an ink containing at least a leuco dye, a developer, water, a water-soluble organic solvent, and a surfactant. The image erasing apparatus includes a heating unit, a feedback mechanism, and a control unit. The heating unit heats the paper sheet. The feedback mechanism supplies the paper sheet heated by the heating unit to the heating unit again. The control unit causes the feedback mechanism to supply the paper sheet to the heating unit a plurality of times so as to heat the paper sheet a plurality of times.

Abstract: There is provided an emulsion coloring material which can be used on ordinary paper, has good color developability, and can be used for conventional erasable pens or printing inks of black or blue color, having sufficiently high densities. When use is made of an erasable emulsion coloring material capable of controlling color development and decolorization by the presence or absence of the interaction between a chromatic material and a color developer, the colored emulsion comprising a copolymer resin of at least one unit selected from styrene and styrene derivatives and at least one unit selected from an acrylic acid ester and a methacrylic acid ester having a substituent which comprises a carbon chain having 4 or more carbon atoms, coloring ability can be enhanced.

Abstract: An erasable image forming material is provided, which includes a binder resin, and a color former and a developer dispersed in the binder resin. The color former is amorphous.

Abstract: An erasable image forming material includes a color former containing crystal violet lactone, a developer, a first binder resin of styrene-butadiene copolymer and a second binder resin of a styrene-based resin containing ?-methylstyrene, the first and second binder resins being in a compatible state.

Abstract: An erasable image forming material includes a color former containing crystal violet lactone, a developer, a first binder resin of styrene-butadiene copolymer and a second binder resin of a styrene-based resin containing ?-methylstyrene, the first and second binder resins being in a compatible state.

Abstract: An erasable image forming material includes a color former, a developer, a binder resin and 0.5 wt % or less of a plasticizer. The erasable image forming material exhibits improved erasure performance.

Abstract: An erasable image forming material includes a color former containing crystal violet lactone, a developer, a first binder resin of styrene-butadiene copolymer and a second binder resin of a styrene-based resin containing a-methylstyrene, the first and second binder resins being in a compatible state.

Abstract: An erasable image forming material is provided, which includes a binder resin, and a color former and a developer dispersed in the binder resin. The color former is amorphous.

Abstract: An erasable image forming material includes a color former, a developer, and a binder resin, the color former containing Crystal Violet Lactone and a specific fluorane compound can enhance light fastness as well as heat decolorizing performance.

Abstract: An erasable image forming material includes a color former containing crystal violet lactone, a developer, a first binder resin of styrene-butadiene copolymer and a second binder resin of a styrene-based resin containing a-methylstyrene, the first and second binder resins being in a compatible state.