Abstract:
A toner including base particles each containing a crystalline polyester and a non-crystalline polyester, wherein the toner has a glass transition temperature of 45°C or higher where the glass transition temperature is determined from a DSC curve of the toner obtained in the first elevation of temperature thereof, and wherein the toner has a temperature width of 8°C or lower where the temperature width is a temperature width at 1/3 the height of an endothermic peak attributed to the crystalline polyester in the DSC curve.
Abstract:
The present invention relates to a non-magnetic mono-component toner composition and a preparation method thereof. Disclosed is a non- magnetic mono-component toner composition prepared by coating spherical organic fine particle having a weight-average molecular weight (Mw) of 250,000-1,600,000 and an average particle size of 50-500 nm, a hydrophobic silica, and a metal oxide fine particle on a toner mother particle. The non-magnetic mono-component toner composition of the present invention ensures smooth toner supply because of good fluidity, reduces PCR contamination and deterioration of image quality, enables uniform toner layer formation on the development roller, prevents blocking at the blade of the development roller, and solves the low temperature double image problemin the non-imaging region at a low temperature. Therefore, it can be useful for an image printing apparatus adopting the non-magnetic mono-component development system in which the developing roller contacts the photoreceptor.
Abstract:
A nonporous dry toner particle has a polymeric binder phase and non- conductive metal oxide particles dispersed therein. The nonporous dry toner particle has a mean volume weighted diameter (Dvoi) before fixing of at least 15 μηι to 40 μηι. The non-conductive metal oxide particles have as aspect ratio of at least 5 and an ECD of at least 2 μηι. They are present in an amount of at least 15 to50 weight % based on total nonporous dry toner particle weight. The ratio of the nonporous dry toner particle Dvoi to the ECD of the non-conductive metal oxide particles in the nonporous dry toner particles, before fixing, is greater than 0.1 and up to and including 10. These nonporous dry toner particles can be included in dry one- component or two-component developers and used to form electrophotographic printed toner images exhibiting special effects such as a metallic effect.
Abstract:
The present invention relates to the combination of a chemically processed toner with extra particulate additive in a conical mixer. The toner may include polymer resins having a glass transition temperature (Tg) wherein the mixer and/or toner may be maintained below the glass transition temperature during mixing. Prior to mixing the toner particles may also be de-agglomerated or mechanically agitated.
Abstract:
The present invention pertains to a process for the preparation of a toner powder, in which particles of one or more toner base compositions are combined into larger particles. The toner base compositions may be in the form of dry powders, e.g., manufactured by jet milling or by freeze drying powder dispersions. In that case, the combination of the toner base compositions into larger particles may be done by, e.g., mechanofusion. The toner base composition may also be in the form of an aqueous emulsion or dispersion. In that case, the combination of the base compositions into larger particles can be effected by spray-drying the emulsion or dispersion. In a preferred embodiment, the toner base composition in aqueous form is prepared via phase inversion emulsification, which preferably is carried out in an extruder. The invention also pertains to a toner powder comprising composite particles in which individual particles of toner base composition(s) are fused or bonded together in the form of cluster structures that do not break down under the mechanical and electrostatic forces encountered during toner use. This can be obtained by mechanofusion of dry toner base powders. The invention also pertains to a toner powder comprising composite particles in which individual particles of toner base composition(s) are fused or bonded together to form single substantially spherical particles. This can be obtained by spray drying of an aqueous emulsion or dispersion. The toner powders of the present invention have increased fluidity as compared to conventional powders. Toners with different colours can be prepared in a simple and convenient manner.
Abstract:
The invention relates to color toner compositions prepared from an aqueous pigment concentrate dispersion which renders a toner exhibiting improved pigment dispersion, and consequently improved image density and color characteristics.
Abstract:
Herein is disclosed an electrostatic ink composition, wherein the composition is formable by combining: chargeable particles comprising a resin comprising a polymer having acidic side groups, and a cyclic anhydride. Also disclosed herein is a method of forming an electrostatic ink composition, and a method of electrostatic printing.
Abstract:
A high opacity white ink containing a mica-based mineral with titania is provided. A method of manufacturing the high opacity white ink is also provided.