Konica Minolta, Inc.

Konica Minolta Business Technologies, Inc.

Takaki Kawamura

Hiroshi Nagasawa

Aya Shirai

Shiro Hirano

Kouji Sugama

Junya Onishi

Kaori Matsushima

Taiki Amemiya

Junya Ueda

Ami Motohashi

Yusuke Takigaura

Hiroyuki Konno

Masahiro Matsuoka

Yasuko Uchino

Anju Hori

Ikuko Sakurada

Natsuko Fujisaki

Natsuki Ito

Kenshi Miyajima

Noboru Ueda

Koji Shibata

Tatsuya Fujisaki

Kaori Fujino

Okushi Okuyama

A toner set includes a plurality of toners, wherein the toner set includes a first toner containing a yellow colorant and a second toner containing a cyan colorant, the first toner and the second toner each contain a binder resin containing a vinyl-based resin and a crystalline resin, and a release agent containing a hydrocarbon wax, a content of the vinyl-based resin with respect to a total mass of the binder resin is 50% by mass or more, the first toner contains the crystalline resin having a moiety having a crystal structure and a crystal nucleating agent moiety having a crystal nucleating agent, and the second toner contains the cyan colorant that is a compound represented by general formula (1).

Toner set and image forming method

An object of the present invention is to provide an image forming method capable of coating a photocurable varnish without unevenness on a toner image formed using an electrostatic latent image developing toner, and further having good adhesion between a varnish layer and the toner image. The image forming method of the present invention comprises: forming a toner image on a recording medium using an electrostatic latent image developing toner containing a toner particle comprising a binder resin and a release agent; and forming a varnish layer on the toner image by applying and curing a photocurable varnish comprising a photocurable compound. The binder resin comprised in the electrostatic latent image developing toner contains a crystalline polyester resin. The photocurable compound comprised in the photocurable varnish comprises a diol di(meth)acrylate having a straight hydrocarbon chain.

Image forming method

Provided is an electrostatic image developing toner including: toner mother particles containing a binder resin and a releasing agent; and an external additive, wherein the binder resin contains a crystalline resin, and the electrostatic image developing toner satisfies the following formulas (1) and (2),tan &#x3b4;&#x3c;tan &#x3b4;&#x2003;&#x2003;Formula (1):0.0005&#x2264;tan &#x3b4;&#x2212;tan &#x3b4;,&#x2003;&#x2003;Formula (2):wherein: tan &#x3b4;is a peak top value of a loss tangent when the loss tangent is measured from 25&#xb0; C. to 100&#xb0; C. at a frequency of 1 Hz and a heating rate of 6&#xb0; C./min; and tan &#x3b4;is a peak top value of a loss tangent when the loss tangent is measured from 25&#xb0; C. to 100&#xb0; C. at a frequency of 1 Hz and a heating rate of 3&#xb0; C./min.

Electrostatic image developing toner

Provided is an image forming method using an electrostatic image developing toner containing: toner mother particles including a binder resin; and an external additive, wherein the binder resin contains a vinyl resin in an amount of 40 mass % or more with respect to the total amount of the binder resin, the image forming method including a step of: forming an image so that an image surface resistance value at 70&#xb0; C. by a temperature change method of the formed image is set to be 5&#xd7;10&#x3a9; or less.

An electrostatic charge image developing toner includes a binder resin and a release agent. A ratio of a crystalline polyester resin to the total amount of a amorphous polyester resin and the crystalline polyester resin is within a range exceeding 40% by mass to 60% by mass. A temperature at which a storage modulus before heat left G' before being left to stand at a temperature of X&#xb0; C. becomes 1.0&#xd7;10Pa is within a range exceeding 45&#xb0; C. to 55&#xb0; C. A storage modulus after heat left G&#x2032; at a temperature of X&#x2032;&#xb0; C. at which a value of a ratio of the storage modulus after heat left G&#x2032; at a temperature of X&#xb0; C. after being left to stand at the temperature of X&#xb0; C. for 2 hours to the storage modulus before heat left G&#x2032; at the temperature of X&#xb0; C. becomes the maximum is within a range of 1.0&#xd7;10to 5.0&#xd7;10Pa.

Electrostatic charge image developing toner

An electrostatic charge image developing toner includes a particulate toner matrix containing a binder resin and an external additive. The binder resin includes an amorphous polyester resin, a crystalline resin, and an amorphous vinyl resin. A storage modulus G'(t) measured before the toner is left and storage moduli G&#x2032;(t) and G&#x2032;(t) measured after the toner is left for three hours at temperatures (T-10)&#xb0; C. and (T-20)&#xb0; C., respectively, based on a melting point (T&#xb0; C.) derived from the crystalline resin satisfy the relations represented by G&#x2032;(t)&#x3c;G&#x2032;(t), G&#x2032;(t)&#x3c;G&#x2032;(t), and G&#x2032;(x)/G&#x2032;(x)&#x2264;1.5 in a temperature range A for measurement where the storage modulus G&#x2032;(t) is 1.0&#xd7;10Pa or more. The value t represents any temperature (&#xb0; C.) for measurement in the temperature range A for measurement; and the value x represents the temperature (&#xb0; C.) for measurement having a maximum difference between the storage moduli G&#x2032;(t) and G&#x2032;(t).

An electrostatic image developing toner including a toner particle, wherein the toner particle contains a vinyl resin which is a polymer of a vinyl monomer having an acid group, a polyester resin, at least one of aluminum (Al) and magnesium (Mg), and tin (Sn), and when net intensities of Al, Mg and Sn in the toner particle measured by fluorescent X-ray analysis are respectively expressed as I, Iand I, a ratio (I+I)/Iis within a range of 0.5 to 2.5.

The toner of the present invention is an electrostatic latent image developing toner, and has a toner base particle. The toner base particle contains a binder resin including a crystalline resin, and a release agent. The toner has the maximum value G'at a temperature equal to or lower than Tm, among specific storage elastic modulus ratios, of 2.2 or more. The Tm represents a peak top temperature (&#xb0; C.) of a specific endothermic peak in DSC of the toner.

Toner

An image forming method forms a color toner image and a white toner image using an image forming apparatus having a plurality of developing machines. The color toner image is formed using a color developer containing a first carrier and at least one color toner selected from a yellow toner, a magenta toner, and a cyan toner. The white toner image is formed using a white developer containing a second carrier and a white toner containing at least titanium oxide as a pigment. Formula (1):Iw&#x3c;Ic&#x2003;&#x2003;(1)is satisfied. Ic (&#x3bc;A) is a dynamic current value of the first carrier at 100 V and Iw (&#x3bc;A) is a dynamic current value of the second carrier at 100 V.

Image forming method, electrostatic charge image developer set, and image forming apparatus

The present toner is an electrostatic latent image developing toner, and contains a toner base particle. The toner base particle contains a binder resin and a release agent. The binder resin contains a crystalline resin and a vinyl resin. When the storage elastic modulus G' at 50&#xb0; C. is defined as G&#x2032;, the peak top temperature (&#xb0; C.) of a specific endothermic peak in DSC of the toner is defined as Tm, the measurement temperature (&#xb0; C.) at a G&#x2032; of 1&#xd7;10Pa is defined as TmA, and the measurement temperature (&#xb0; C.) at a G&#x2032; of 1&#xd7;10Pa is defined as TmB, the toner satisfies the following expressions (1) to (3):&#x2267;1&#xd7;10&#x2003;&#x2003;(1)&#x2266;8&#x2003;&#x2003;(2)&#x2003;&#x2003;(3).

The invention provides an image formation method, a toner set, and a white toner, by which a masking function of an image layer formed by a white toner on a recording medium can be developed efficiently, and low temperature fixability can be improved. An image formation method for fixing an image forming layer (A) to be formed using a white toner, and an image forming layer (B) to be formed adjacent to the image forming layer (A) using a toner different from the white toner on a recording medium; wherein the following relational expressions (1) and (2) are satisfied:1.000&#x3c;&#x3c;1.300&#x2003;&#x2003; (1);and1.000&#x3c;&#x3c;1.060&#x2003;&#x2003;(2).

Image formation method, toner set, and white toner

Provided is a toner for electrostatic image development that has good low-temperature fixability, also has long-term heat-resistant storage stability and can form an image with unevenness in gloss suppressed. The toner for electrostatic image development includes toner particles. The toner particles have a domain-matrix structure in which a first domain phase including a crystalline polyester resin A and a second domain phase including a crystalline polyester resin B are dispersed in a matrix phase including a vinyl resin. The average diameter of the first domain phase is 400 to 900 nm, and the average diameter of the second domain phase is 10 to 200 nm. The melting point of the crystalline polyester resin A and the melting point of the crystalline polyester resin B are each 95&#xb0; C. or lower.

Toner for electrostatic image development

Provided is a toner for electrostatic image development, having low-temperature fixability and long-term stable charge property and also having heat-resistant storage stability. The toner for electrostatic image development includes toner particles containing a binder resin. The binder resin has a domain-matrix structure in which a crystalline polyester resin is dispersed as a domain phase in a matrix phase formed of an amorphous vinyl polymer formed using at least a vinyl-based monomer. The amorphous vinyl polymer has a carboxy group concentration of not less than 0.2 mmol/g and not more than 1.0 mmol/g, and the crystalline polyester resin has an ester group concentration of not less than 0.1 mmol/g and not more than 7.1 mmol/g.

Provided is a toner for electrostatic image development having low-temperature fixability and providing stability of glossiness for various types of paper. The toner for electrostatic image development includes toner particles having a domain-matrix structure. In the domain-matrix structure, a domain phase including a crystalline polyester resin having a melting point of 40 to 90&#xb0; C. and a domain phase including a vinyl resin B having a weight average molecular weight of 250,000 to 400,000 are dispersed in a matrix phase including a vinyl resin A having a weight average molecular weight of 10,000 to 50,000.

Disclosed is a toner for electrostatic image development that has excellent low-temperature fixability and also has sufficient heat-resistant storage stability. The toner for electrostatic image development includes toner particles containing an amorphous resin including amorphous resins A and B and a crystalline polyester resin. The toner particles have a domain-matrix structure in which a domain phase including fine core particles of the crystalline polyester resin is dispersed in a matrix phase formed of the amorphous resin A composed of a vinyl-based polymer. The surface of the fine core particles of the crystalline polyester resin is coated with the amorphous resin B composed of a vinyl-based polymer.

Growing community of inventors

Tokyo, Japan

Takaki Kawamura