Canon Kabushiki Kaisha

Shintaro Noji

Tsutomu Shimano

Masatake Tanaka

Naoya Isono

Yu Yoshida

Yoshihiro Nakagawa

Yoshiaki Shiotari

Hirofumi Kyuushima

Hitoshi Itabashi

Takeshi Kaburagi

Shohei Shibahara

Mai Kato

Kazutaka Sasaki

A toner comprising a toner particle, wherein the toner particle comprises a binder resin, the binder resin comprises a resin A and a resin B, the toner particle comprises protrusions on a surface thereof, each of the protrusions comprises the resin B, a shape factor SF-2 of the toner as observed under SEM is 105 to 120, and when the toner is observed under the SEM, a surface unevenness index of the toner as calculated by formula (1) below is 0.010 to 0.050:Surface unevenness index=(area of region surrounded by convex hull of toner&#x2212;projected area of toner)/projected area of toner&#x2003;&#x2003;(1).

Toner and method for manufacturing toner

A toner comprising a toner particle that includes a binder resin, wherein in dynamic viscoelasticity measurement of the toner, the storage elastic modulus of the toner at 70&#xb0; C. is from 0.10 MPa to 3.00 MPa, and in nanoindentation measurement of the toner, the surface storage elastic modulus of the toner at 25&#xb0; C. under 150 &#x3bc;N of load is from 2.80 GPa to 4.50 GPa.

Toner and toner manufacturing method

The present invention provides a toner that exhibits an excellent colorant dispersibility and hence maintains the formation of a high-quality image, that is capable of low-temperature fixing, and that has a satisfactory heat-resistant storability and a satisfactory durability, in which the toner comprising a toner particle that contains a colorant and a binder resin containing a styrene-acrylic resin and a crystalline resin, wherein a compatibility parameter (V) between the styrene-acrylic resin and the crystalline resin satisfies 0.40&#x2266;V&#x2266;1.10.

Toner

Provided is a toner for which the heat-resistant storability and the low-temperature fixability are able to co-exist at higher levels and for which the temporal stability of the low-temperature fixability is also excellent. The toner has a toner particle that contains a binder resin and a pigment, and this binder resin contains a polyester resin that has a specific structure and specific properties.

The present invention relates to a toner having a toner particle containing a binder resin containing a styrene acrylic resin and a block polymer, wherein the block polymer has a polyester segment and a vinyl polymer segment and has a melting point of 55&#xb0; C. to 90&#xb0; C., the polyester segment has a specific structure and a solubility parameter (SP) value of 9.40 to 9.85, and the vinyl polymer segment has a weight-average molecular weight (Mw) of 4000 to 15000.

A toner particle production method has an annealing step that is performed after the preparation of a resin solution by the dissolution or dispersion, in an organic solvent, of a binder resin having a polyester resin as its major component and a block polymer having a polyester segment and a vinyl polymer segment, and the preparation of a resin particle dispersion in which resin particles are dispersed by a dissolution suspension method, wherein, in this annealing step, the temperature of the obtained resin particle dispersion is held for at least 60 minutes in the temperature range from TgA-15 (&#xb0; C.) to TmA (&#xb0; C.), and under the conditions of a temperature variation range of not more than 20&#xb0; C. and a temperature variation rate of not more than 0.35&#xb0; C./minute.

Method of producing a toner particle

It is an object of the present invention to provide a toner capable of being fixed at low energy and forming an image with high resistance to external forces, such as rubbing and scratching. The object is achieved by a toner including toner particles that contain a binder resin and a colorant, a sea-island structure including a sea portion composed of the crystalline resin C serving as a main component and island portions composed of the amorphous resin A serving as a main component is observed at the observation of a cross section of each of the toner particles.

A toner that comprises a toner particle that contains a binder resin that contains a styrene-acrylic resin and a block polymer, wherein the block polymer has a polyester segment and a vinyl polymer segment; the polyester segment is obtained by condensation polymerization of: a monomer (a) selected from a group consisting of a prescribed monomer group A; and a monomer (b) selected from a group consisting of a prescribed monomer group B, and the content in the polyester segment of the substructure originating with the monomer (b) as calculated from the following formula is from at least 1.0 mol % to not more than 30.0 mol %: {monomer (b) [mol]/(monomer (a) [mol]+monomer (b) [mol])}&#xd7;100.

The present invention relates to a toner including a toner particle containing a binder resin, wherein the binder resin contains a block polymer and a styrene-acrylic resin, the block polymer has a vinyl polymer segment and a polyester segment, the polyester segment has a branch structure and the block polymer has a melting point of 50&#xb0; C. to 95&#xb0; C.

A toner containing a toner particle containing a binder resin, wherein the binder resin contains a styrene-acrylic resin and a crystalline resin, and the crystalline resin is a block polymer or a graft polymer in which the mass ratio between the crystalline segment and an amorphous segment is 30:70 to 90:10, and wherein, in the total heat flow measured for the binder resin by a temperature-modulated differential scanning calorimeter, the peak temperature of an endothermic peak is from 55.0&#xb0; C. to 90.0&#xb0; C., and the percentage of the endothermic quantity of the endothermic peak in the reversing heat flow with respect to the endothermic quantity of the endothermic peak in the total heat flow is from 0.0% to 35.0%.

A method for producing toner particles that contain a binder resin having a styrene-acrylic resin as a main component, a colorant, and a block polymer that has polyester segments and vinyl polymer segments, has a step of producing resin particles in accordance with a suspension polymerization method or a dissolution suspension method, and thereafter, holding the temperature of the aqueous medium in which the resin particles are dispersed, for 60 minutes or more, between a glass transition point TgA (&#xb0; C.) of the resin particles and an onset temperature TmA (&#xb0; C.) of an endothermic peak derived from the block polymer in the resin particles, in such a manner that a temperature fluctuation rate not greater than 0.35&#xb0; C./minute, and a temperature fluctuation range is not greater than 20&#xb0; C.

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Mishima, Japan

Shintaro Noji