摘要:
The present invention relates to the positively chargeable black toner particles which comprise binder resins, carbonblack as a main colorant, quaternary anmonium salt of the following formula (I) as a charge control agent and .beta.-form Cu-phthalocyanine as a stabilizing agent for chargeability of toner particles without being affected by the change of environmental conditions. ##STR1## Wherein R.sub.1 is C.sub.1 -C.sub.8 alkyl or benzyl, R.sub.2 and R.sub.3 are each C.sub.1 -C.sub.18 alkyl, R is C.sub.1 -C.sub.118 alkyl or benzyl, X is hydroxy or amino, and Y is hydoroxy or hydrogen; (c) .beta.-form Cu-phthalocyanine; and (d) carbonblack.The present invention further relates to the two component dry-type developer composed by the improved above said positively chargeable toner particles and the carrier particles coated with silicone polylmers which have the strong durability without being changed to a supent carrier particles for a use of long time period.
摘要:
A dry type toner for electrophotography is disclosed which comprises as the main components (a) a coloring agent; and (b) a polyol resin serving as a binder agent in an effective amount, the polyol resin being prepared by subjecting a bisphenol-type epoxy resin containing epoxy groups, which may contain secondary hydroxyl groups, to reaction steps (1), (2) and (3), or steps (2) and (3), in any sequential combination, until substantially no epoxy groups remain in the polyol resin, wherein the reaction step (1) comprises a step of causing the epoxy groups in the bisphenol-type epoxy resin to react with a primary amine; the reaction step (2) comprising a step of causing the epoxy groups to react with a compound containing one active hydrogen capable of reacting with the epoxy groups; and the reaction step (3) comprising a step of esterifying at least part of the secondary hydroxyl groups or hydroxyl groups produced in the bisphenol-type epoxy resin by reaction step (1) and/or reaction step (2) by use of an esterifying agent.
摘要:
A magenta toner is disclosed, which comprises a coloring composition comprising a thioindigo pigment, and a xanthene dye having general formula (I) or a laked xanthene dye thereof, and a binder resin: ##STR1## wherein R.sup.1, R.sup.2, R.sup.5, R.sup.6, and R.sup.7 each represent hydrogen or a lower alkyl group; R.sup.3 and R.sup.4 each represent a lower alkyl group; and A.sup.- represents halogen.
摘要:
A triboelectric charge application member for imparting or applying electrostatic charge to a toner through the triboelectric charging thereof for developing electrostatic images with the charge toner to visible toner images. The triboelectric charge application member includes an overcoat layer comprising as the main component a polymer which comprises a fluoro-olefin compound and an unsaturated silicon compound as the monomer units of the polymer. The triboelectric charge application member may be carrier particles having the above overcoat layer and a toner transportation member having the overcoat layer, depending upon its application.
摘要:
A triboelectric charge application member for imparting or applying electrostatic charge to a toner through the triboelectric charging thereof for developing electrostatic images with the charged toner to visible toner images. The triboelectric charge application member includes an overcoat layer comprising as the main component a polymer which comprises a fluoro-olefin compound and an unsaturated silicon compound as the monomer units of the polymer. The triboelectric charge application member may be carrier particles having the above overcoat layer and a toner transportation member having the overcoat layer, depending upon its application.
摘要:
An image formation method including charging an image bearing member; irradiating the surface of the image bearing member to form a latent electrostatic image thereon; developing the latent electrostatic image with a two component developing agent including a carrier and a toner including a mother toner particle and an external additive by a development device including a stirring and transfer device for transferring and stirring the developing agent; transferring the developed image to a transfer medium; and fixing the developed image on the transfer medium, wherein the toner includes a polyol-based resin as a binder resin, the polyol based resin having multiple hydroxyl groups in a molecular chain thereof in which the ratio (EX/OH) of epoxy group (EX) to hydroxyl group (OH) is from 0.990 to 1.010, the stirring and transfer device satisfies the following relationship (I): 1.0×106≦α×β×γ≦16.0×106, wherein α represents the number of rotation per minute, β (mm) represents the pitch and γ (mm) represents the transfer path length of the stirring and transfer device, the temperature Tin (° C.) in the development device during stirring and transfer of the two component developing agent satisfies the following relationship (II): 30° C.
摘要:
This invention relates to a toner for developing an electrostatic latent image, which contains a coloring agent, a binder resin and a charge controlling agent as the main components, said charge controlling agent being a metal salt of salicylic acid or derivatives.
摘要:
A toner includes a polyol-based resin having multiple hydroxyl groups in a molecular chain thereof in which a ratio of epoxy group to hydroxyl group is from 0.990 to 1.010. A stirring and transfer device satisfies 1000000≦α×β×γ≦16000000, wherein α represents a number of rotation per minute, β (mm) represents a pitch and γ (mm) represents a transfer path length of the stirring and transfer device. A temperature Tin (° C.) in a development device during stirring and transfer of a two component developing agent satisfies 3020 C.
摘要:
A toner for dry developing, containing a colorant and a binder and giving such a toner image on a transfer sheet upon fixation that has an image density I and a gross of G % when the toner deposits on the transfer sheet in an amount of M mg/cm.sup.2, wherein I, G and M have the following relationship:I=a.multidot.M+bwhere 0
摘要:
An apparatus for pulverizing solid particles including an impact-type pulverizing device, a mechanical-type pulverizing device and a piping system connected to the pulverizing devices such that the solid particles may be selectively pulverized in the impact-type pulverizing device and in the mechanical-type pulverizing device successively in this or reverse order.