摘要:
The present invention relates to a developer for electrostatic image development comprising: a toner for electrostatic image development which comprises a resin and a colorant; and a carrier formed by a carrier core material and a resin layer including a resistance control agent which is formed on the surface of the carrier core material, wherein the resin layer of the carrier has a concentration gradient of the resistance control agent toward the thickness direction of the resin layer, a concentration of the resistance control agent is the highest in the vicinity of the carrier core material, and is gradually lowered toward the surface of the resin layer, and the resistance control agent is present on the surface of the resin layer, as well as relates to an image forming method, wherein it comprises a step of developing an electrostatic image at a developing speed of 20 m/min or higher, by means of employing the developer for electrostatic image development. The developer for electrostatic image development of the invention exhibits a stable development and transfer behavior without any variation of triboelectric charging performance, electric resistance, or the like, even when used as a two-component developer, and in addition, affords a printed image with high image quality and high grade without any fogging.
摘要:
A toner contains at least a binder resin, a colorant, a wax and an aluminum compound, wherein the binder resin has an acid value of 1 to 40 mgKOH/g; the binder resin contains 2% to 50% by weight of tetrahydrofuran (THF) based on the weight of the binder resin; a tetrahydrofuran-soluble matter of the binder resin has a main peak in a molecular weight range of from 2,000 to 30,000 in a chromatogram by gel permeation chromatography (GPC); and the aluminum compound is a specific aluminum compound of substituted or unsubstituted benzilic acid.
摘要:
A colored composition which includes a mutable colorant, an ultraviolet radiation transorber, and a molecular includant, wherein more than two molecules of the ultraviolet radiation transorber are covalently coupled to each molecule of the molecular includant. The combination of ultraviolet radiation transorber and molecular includant is denominated a functionalized molecular includant. The covalent coupling of the ultraviolet radiation transorber may be accomplished by a method which includes the steps of providing a derivatized ultraviolet radiation transorber having a nucleophilic group, providing a derivatized molecular includant having more than two leaving groups per molecule, and reacting the derivatized ultraviolet radiation transorber with the derivatized molecular includant under conditions sufficient to result in the covalent coupling of an average of more than two ultaviolet radiation transorber molecules to each molecular includant molecule. Particularly suitable nucleophilic and leaving groups are mercapto and p-toluenesulfonyl (tosyl), respectively.
摘要:
Cyclosaccharid-Borkomplexe, bestehend aus 1 bis 4 Cyclodextrin-Einheiten und einem Borat-Rest der Formel (I) haben gute Ladungssteuereigenschaften und lassen sich hervorragend in Toner-, Pulverlack- und Elektretbindemitteln dispergieren.
摘要:
A light-stable colored composition which includes a colorant and a radiation transorber. The colorant, in the presence of the radiation transorber, is adapted, upon exposure of the transorber to specific, narrow bandwidth radiation, to be mutable. The radiation transorber also imparts light-stability to the colorant so that the colorant does not fade when exposed to sunlight or artificial light.
摘要:
Charge control agent wherein the active ingredient is a nigrosine compound [I] obtained by reacting either C.I. Solvent Black 7 or C.I. Solvent Black 5 and one or more compounds selected from the group consisting of (a) sulfonic acid-series surface-active anionic organic compounds, (b) sulfuric acid ester-series surface-active anionic organic compounds, (c) phosphoric acid ester-series surface-active anionic organic compounds and (d) carboxylic acid-series surface-active anionic organic compounds excepting saturated and unsaturated fatty acids and salts thereof, and toner for developing electrostatic images that comprises a resin for toners, coloring agent and said charge control agent.
摘要:
Colored thermoplastic resin composition comprising a transparent thermoplastic resin and a black dye contained therein, wherein said black dye is a black dye obtained by reaction of at least one anionic surfactant selected from the group consisting of
摘要:
A dry toner powder the toner particles of which are triboelectrically negatively charged and are suited for development of an electrostatic charge pattern, wherein said toner particles contain: (1) one or more triboelectrically negatively chargeable thermoplastic resins serving as binder having a volume resistivity of at least 1013 Φ-cm, and (2) at least one substance having a volume resistivity lower than the volume resistivity of said binder, and wherein said substance(s) (2) is (are) capable of lowering the volume resistivity of said binder by a factor of at least 3.3 when present in said binder in a concentration of 5 % by weight relative to the weight of said binder, and wherein said toner powder containing particles including a mixture of said ingredients (1) and (2) under triboelectric charging conditions is capable of obtaining an absolute median (q/d) charge/diameter value (x) lower than 10 fC/10 νm but not lower than 1 fC/10 νm, and said toner powder under the same triboelectric charging conditions but free from said substance(s) (2) then has an absolute median q/d value (x) at least 50 % higher than when said substance(s) (2) is (are) present, and wherein the distribution of the charge/diameter values of the individual toner particles is characterized by a coefficient of variation ξ « 0.33.