JP2012128020A - Toner for developing electrostatic charge image, developer for electrostatic charge image, toner cartridge, process cartridge, image forming apparatus and method for forming image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toner for developing an electrostatic charge image which enhances a scratch strength of an obtained fixed image.SOLUTION: A toner for developing an electrostatic charge image includes: at least one boron compound selected from a polymer having at least one of a boric acid, a boronic acid, a borinic acid and ester compounds thereof, and a boronic acid group, a borinic acid group and ester groups thereof; and a diol compound having a diol structure, where the both of the compounds are provided separately from each other.

Description

  The present invention relates to an electrostatic charge image developing toner, an electrostatic charge image developer, a toner cartridge, a process cartridge, an image forming apparatus, and an image forming method.

  A method of visualizing image information through an electrostatic latent image such as electrophotography is currently used in various fields. In electrophotography, an electrostatic latent image formed on a photoreceptor by a charging process and an exposure process is developed with a developer containing toner, and visualized through a transfer process and a fixing process.

As a fixing method in this fixing step, a pressure fixing method is known (for example, see Patent Documents 1 to 5).
Patent Document 1 proposes a toner having a core / shell structure that imparts pressure fluidity by varying the glass transition temperature between the core and the shell.
Patent Document 2 includes toner fine particles having a particle size in the range of about 0.5 to about 1000 microns and an agglomeration temperature of at least about 37.8 ° C., and includes a colorant and an adhesive soft material. An electrostatographic magnetic toner material has been proposed in which a solid polymer core material and magnetic particles are encapsulated with a polymer shell material.
Patent Document 3 proposes a pressure-fixing toner comprising a composition containing 30 to 70 parts by weight of a bis-fatty acid amide as a binder component.
Patent Document 4 discloses a toner characterized by atomizing a toner material containing polyethylene having a density of 0.94 g / cm ³ or more and a long chain compound having a carbon chain of C12 to C99 in a molten state. Has been proposed.
In Patent Document 5, in a microcapsule type toner having a core material and an outer wall for covering the core material, the core material has a vinyl-based weight having a weight average molecular weight / number average molecular weight value of 3.5 to 20. There has been proposed a microcapsule type toner characterized by containing a coalescence as a main component.

On the other hand, various attempts have been made on methods for improving the image intensity of a fixed image of a toner image (see, for example, Patent Documents 6 to 11).
Patent Document 6 proposes a toner containing a binder resin, a colorant, and urethane particles.
Patent Document 7 proposes an image that is resistant to bending by defining the components and amounts of the binder resin.
Patent Document 8 proposes a method in which a vinyl resin and a polyester resin are contained in addition to the binder resin component, and the tetrahydrofuran insoluble content and the liquid paraffin amount in the toner are defined.
Patent Document 9 proposes a method of defining a glass transition temperature (Tg) and a softening point of a toner containing a binder resin, a colorant, and polybutadiene.
Patent Document 10 proposes a method of defining the resin configuration and molecular weight of toner and using Fischer-Tropsch wax.
Patent Document 11 proposes a toner that defines methanol wettability.

JP 2009-53318 A JP 49-17739 A JP 58-86557 A JP-A-57-201246 JP 61-56355 A JP 2009-198972 A Japanese Patent Laid-Open No. 8-62894 JP-A-11-305479 JP 2007-133308 A JP-A-7-271084 JP 2007-248666 A

  An object of the present invention is to provide a toner for developing an electrostatic charge image in which the scratch strength of the obtained fixed image is improved as compared with the case where the following boron compound and the following diol compound are not included.

The above problem is solved by the following means. That is,
The invention according to claim 1
Boric acid, boronic acid, borinic acid, and ester compounds thereof, and at least one boron compound selected from polymers having at least one of boronic acid groups, borinic acid groups, and ester groups thereof;
A diol compound having a diol structure;
A toner for developing an electrostatic charge image containing the toner separately.

The invention according to claim 2
The electrostatic charge image developing toner according to claim 1, comprising: a first toner containing the boron compound; and a second toner containing the diol compound.

The invention according to claim 3
Toner particles containing one of the boron compound and the diol compound;
An external additive containing the other of the boron compound and the diol compound;
The toner for developing an electrostatic charge image according to claim 1.

The invention according to claim 4
The electrostatic image developing toner according to claim 1, wherein the boron compound is at least one selected from polymers represented by the following general formula (1).

(In general formula (1), A represents a repeating unit in which a monomer having at least one of a boronic acid group, a borinic acid group, and an ester group thereof is polymerized.
B represents a repeating unit in which a monomer copolymerizable with the repeating unit represented by A is polymerized.
m and n each independently represent mol% of each repeating unit, m is 1 mol% or more and 100 mol% or less, and n is 0 mol% or more and 99 mol% or less. )

The invention according to claim 5
An electrostatic charge image developer comprising at least the electrostatic charge image developing toner according to claim 1.

The invention according to claim 6
Containing the electrostatic image developing toner according to claim 1;
A toner cartridge to be attached to and detached from the image forming apparatus.

The invention according to claim 7 provides:
A developing means for accommodating the electrostatic charge image developer according to claim 5 and developing the electrostatic charge image formed on the image carrier as a toner image by the electrostatic charge image developer,
A process cartridge attached to and detached from the image forming apparatus.

The invention according to claim 8 provides:
An image carrier,
Charging means for charging the image carrier;
An electrostatic charge image forming means for forming an electrostatic charge image on the surface of the charged image carrier;
Developing means for containing the electrostatic charge image developer according to claim 5 and developing the electrostatic charge image formed on the image carrier as a toner image by the electrostatic charge image developer;
Transfer means for transferring a toner image formed on the image carrier onto a transfer target;
Fixing means for fixing the toner image transferred onto the transfer medium;
Image forming apparatus comprising

The invention according to claim 9 is:
The image forming apparatus according to claim 8, wherein the fixing unit is a fixing unit that applies the pressure at a temperature of 40 ° C. or less to fix the toner image.

The invention according to claim 10 is:
A charging step for charging the image carrier;
An electrostatic charge image forming step of forming an electrostatic charge image on the surface of the charged image carrier;
A developing step of containing the electrostatic charge image developer according to claim 5 and developing the electrostatic charge image formed on the image carrier as a toner image by the electrostatic charge image developer;
A transfer step of transferring a toner image formed on the image carrier onto a transfer target;
A fixing step of fixing the toner image transferred onto the transfer medium;
An image forming method comprising:

The invention according to claim 11 is:
The image forming method according to claim 10, wherein the fixing step is a fixing step of fixing the toner image by applying a pressure at a temperature of 40 ° C. or less.
apparatus.

According to the first, second, and third aspects of the invention, it is possible to provide a toner for developing an electrostatic image that can improve the scratch strength of the obtained fixed image as compared with the case where the boron compound and the diol compound are not included.
According to the invention of claim 4, the electrostatic charge image in which the scratch strength of the obtained fixed image is improved as compared with the case where the boron compound is not at least one selected from the polymer represented by the general formula (1). A developing toner can be provided.
According to the inventions according to claims 5, 6, 7, 8, and 10, the scratch strength of the obtained fixed image is improved as compared with the case where the toner for developing an electrostatic charge image not containing the boron compound and the diol compound is applied. An electrostatic charge image developer, a toner cartridge, a process cartridge, an image forming apparatus, and an image forming method can be provided.
According to the ninth and eleventh aspects of the present invention, the obtained fixed image is scratched even when the pressure fixing method is adopted, as compared with the case where the toner for developing an electrostatic charge image not containing the boron compound and the diol compound is applied. An image forming apparatus and an image forming method with improved strength can be provided.

1 is a schematic configuration diagram illustrating an example of an image forming apparatus according to an exemplary embodiment. It is a schematic block diagram which shows an example of the process cartridge which concerns on this embodiment.

  Hereinafter, an embodiment which is an example of the present invention will be described in detail.

(Static image developing toner)
The electrostatic image developing toner according to the exemplary embodiment (hereinafter may be referred to as toner) is a toner containing a boron compound and a diol compound separately.
The boron compound is at least selected from boric acid, boronic acid, borinic acid, and ester compounds thereof, and a polymer having at least one of boronic acid groups, borinic acid groups, and ester groups thereof. One boron compound is applied.
On the other hand, a diol compound having a diol structure is applied as the diol compound.

The toner according to the exemplary embodiment has the above-described configuration, so that the scratch strength of the obtained fixed image is improved.
This is because, due to toner image fixing (thermal fixing or pressure fixing), a boron compound and a diol compound that exist separately in the toner are brought into contact with each other, for example, due to melting of the toner due to heat or pressure flow. Thus, it is considered that a condensation reaction of the hydroxyl group (or ester group) of the boron compound and the hydroxyl group of the diol compound occurs to form a crosslinked network structure.
For this reason, at least one of the boron compound and the diol compound is preferably a polymer compound.

In addition, since the toner according to the exemplary embodiment is considered that the component of the obtained fixed image forms the above-described crosslinked network structure, the toner is excellent in heat storage property, for example, in a high temperature / high pressure environment (for example, temperature 60 ° C., pressure When stored in an environment in which a pressure of 10,000 Pa is applied, peeling of a fixed image and set-off to other paper (transfer medium) are also suppressed.
The toner according to the present embodiment can obtain a fixed image with improved scratch strength of the fixed image regardless of whether the heat fixing method or the pressure fixing method is employed.

Specific examples of the toner according to the exemplary embodiment include the following types of toner.
A) a first toner containing a boron compound (specifically, for example, a toner containing a boron compound in at least one of toner particles and external additives constituting the toner) and a second toner containing a diol compound (specifically, for example, A toner containing a diol compound in at least one of toner particles and an external additive constituting the toner.
B) A toner having toner particles containing one of a boron compound and a diol compound and an external additive containing the other of the boron compound and the diol compound (specifically, for example, toner particles containing a boron compound and a diol) A toner composed of an external additive containing a compound, or a toner composed of toner particles containing a diol compound and an external additive containing a boron compound).

That is, in the toner according to the present embodiment, the toner particles containing the boron compound, the toner particles containing the diol compound, the external additive containing the boron compound, so that the boron compound and the diol compound exist in the toner in isolation. A combination of external additives containing a diol compound is preferable.
Of course, toner particles and external additives that do not contain boron compounds or diol compounds may be combined.

  Hereinafter, details of the toner according to the exemplary embodiment will be described.

-Boron compounds-
Boron compounds include boric acid (unsubstituted boric acid), boronic acid, borinic acid, and ester compounds thereof, and polymers having at least one of boronic acid groups, borinic acid groups, and ester groups thereof. At least one boron compound selected is applied.

  Examples of borate ester compounds include trimethyl borate, triether borate, tripropyl borate, triisopropyl borate, tributyl borate, trioctyl borate, tridecyl borate, tritetradecyl borate, trioctadecyl borate, Triphenyl borate, tritolyl borate, tristearyl borate, tri (4-chlorophenyl) borate 2,4,6-trimethoxyboroxine, 2-isopropoxy-4,4,5,5-tetramethyl-1 3,2-dioxaborolane, 2-methoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, triethanolamine borate, tri (hexafluoroisopropyl) borate and the like.

Examples of the boronic acid include 1,1′-ferrocenediboronic acid, 1,4-phenylenediboronic acid, 1,3-phenylenediboronic acid, 4,4′-biphenyldiboronic acid, and the like.
Examples of boronic acid ester compounds include, for example, the methyl esters, ethyl esters, butyl esters, hexyl esters, octyl esters, cyclohexyl esters, ethylene glycol esters, propylene glycol esters, catechol esters, diethanolamine esters, and phenyl esters of the boronic acids listed above. Etc.

Examples of borinic acid include dimethylborinic acid, diethylborinic acid, dipropylborinic acid, dibutylborinic acid, diphenylborinic acid, ethylbutylborinic acid, 1,4-dihydroxy-1,4-diboracyclohexane, 1,3 , 5-trihydroxy-1,3,5-triboracyclohexane and the like.
Examples of the borinic acid ester compounds include the methyl esters, ethyl esters, butyl esters, hexyl esters, octyl esters, cyclohexyl esters, ethylene glycol esters, propylene glycol esters, catechol esters, diethanolamine esters, and phenyl esters of the above-described borinic acids. Etc.

Examples of the polymer (hereinafter sometimes referred to as boron-containing resin) having at least one of a boronic acid group, a borinic acid group, and an ester group thereof (boronic acid ester group, borinic acid ester group) include boron. Examples thereof include a homopolymer of a boron-containing monomer having at least one of an acid group, a borinic acid group, and an ester group thereof, or a copolymer of the boron-containing monomer and another monomer.
Specific examples of the boron-containing resin preferably include a polymer represented by the following general formula (1).
By applying these boron-containing resins, it is considered that the molecular chain constituting the three-dimensional crosslinked network structure generated by the reaction with the diol compound takes a more entangled structure, and the scratch strength of the obtained fixed image is easily improved. .

In general formula (1), A represents a repeating unit in which a monomer (boron-containing monomer) having at least one of a boronic acid group, a borinic acid group, and an ester group thereof is polymerized.
B represents a repeating unit in which a monomer copolymerizable with the repeating unit represented by A is polymerized.
m and n each independently represents mol% of each repeating unit.
m is 1 mol% or more and 100 mol% or less, n is 0 mol% or more and 99 mol% or less (preferably m is 1 mol% or more and 50 mol% or less, and n is 50 mol% or more and 99 mol% or less. Below).
When n represents 0, the polymer represented by the general formula (1) is a polymer composed of only a repeating unit obtained by polymerizing a boron-containing monomer.

Here, the boronic acid group is a group represented by the formula: —B (OH) ₂ .
Examples of boronic acid ester groups include boronic acid dimethyl ester group, boronic acid diethyl ester group, boronic acid dibutyl ester group, boronic acid di-n-hexyl ester group, boronic acid dicyclohexyl ester group, and boronic acid. Examples thereof include a dioctyloctyl ester group, a boronic acid ethylene glycol ester group, a boronic acid propylene glycol ester group, a boronic acid catechol ester group, a boronic acid glycerin ester group, a boronic acid diethanolamine ester group, and a boronic acid phenyl ester group.

On the other hand, the borinic acid group is a group represented by the formula: -B (OH) (X).
In the borinic acid represented by the formula, X represents an alkyl group, an aryl group, an aralkyl group, or an amino group.

  In the borinic acid represented by the formula, the alkyl group represented by X may be linear, branched, or cyclic, and may be substituted with a hydroxyl group or an ether group. Further, the number of carbon atoms of the alkyl group represented by X is preferably 1 or more and 18 or less, and more preferably 1 or more and 8 or less. Specific examples of the alkyl group include, for example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, sec-butyl group, t-butyl group, n-hexyl group, cyclohexyl group, 2-ethylhexyl group, n- An octyl group, a decyl group, a dodecyl group, etc. are mentioned, and a methyl group, an ethyl group, a propyl group, and an isopropyl group are particularly desirable.

  In the borinic acid represented by the formula, the aryl group represented by X may be substituted with a hydroxyl group or an ether group. The number of carbon atoms of the aryl group represented by X is preferably 6 or more and 18 or less, and more preferably 6 or more and 8 or less. Specific examples of the aryl group include a phenyl group, a cumenyl group, a mesityl group, a xylyl group, a naphthyl group, and the like, and a phenyl group is particularly desirable.

  In the borinic acid represented by the formula, the aralkyl group represented by X may be substituted with a hydroxyl group or an ether group. The number of carbon atoms in the aralkyl group represented by X is preferably 7 or more and 13 or less, and more preferably 7 or more and 9 or less. Examples of the aralkyl group include a benzyl group, a diphenylmethyl group, a cinnamyl group, a phenethyl group, a styryl group, and the like, and a benzyl group is particularly desirable.

  Examples of the borinic acid ester group include methyl boric acid methyl ester group, ethyl boric acid ethyl ester group, ethyl boric acid methyl ester group, butyl boric acid methyl ester group, phenyl boric acid methyl ester group, methyl boric acid phenyl ester group, benzylborin Acid methyl ester group, aminoboric acid methyl ester group, and the like.

And in general formula (1), as a monomer (monomer having a boron-containing group) that gives the repeating unit represented by A, for example, p-vinylphenylboronic acid, (meth) acrylamidophenylboronic acid, p -Hydroxyborylstyrene and N- (4'-vinylbenzyl) -4-phenylboronic acid carboxylate are preferable.
The description “(meth) acryl” means acryl or methacryl. The same applies hereinafter.

  On the other hand, in the general formula (1), as the monomer (other monomer) that gives the repeating unit represented by B, for example, (meth) acrylic acid alkyl ester [for example, methyl (meth) acrylate, (meth) ) Ethyl acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, hexyl (meth) acrylate , (Meth) acrylic acid octyl, (meth) acrylic acid 2-ethylhexyl, (meth) acrylic acid lauryl, (meth) acrylic acid C1-18 alkyl ester, etc.], (meth) acrylic acid Cycloalkyl esters [cyclohexyl (meth) acrylate, etc.], (meth) acrylic acid aryl esters [(meth) actyl Phenyl acrylate, etc.], aralkyl esters [benzyl (meth) acrylate, etc.], substituted (meth) acrylic acid alkyl esters [eg, 2-hydroxyethyl (meth) acrylate, etc.], (meth) acrylamides [eg, ( Meth) acrylamide, dimethyl (meth) acrylamide, etc.], aromatic vinyl [styrene, vinyl toluene, α-methyl styrene, etc.], vinyl esters [vinyl acetate, vinyl propionate, vinyl benzoate, vinyl versatate, etc.], Examples include allyl esters [eg allyl acetate], halogen-containing monomers [vinylidene chloride, vinyl chloride etc.], vinyl cyanide [(meth) acrylonitrile etc.], olefins [ethylene, propylene etc.], and the like.

  In particular, when the toner according to the exemplary embodiment is used in a heat fixing method, that is, when heat-melting property is imparted to a boron-containing resin, a monomer that gives a repeating unit represented by B in General Formula (1) (others) As the monomer, for example, methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, benzyl (meth) acrylate, styrene, benzoic acid Particularly preferred are vinyl acid acid, and mixtures thereof.

  In addition, when the toner according to the exemplary embodiment is used in a pressure fixing method, that is, when pressure fluidity is imparted to a boron-containing resin, a monomer (others) that gives a repeating unit represented by B in the general formula (1) As the monomer), for example, n-butyl (meth) acrylate, t-butyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate , Stearyl (meth) acrylate, styrene, and mixtures thereof are particularly preferable.

In particular, when pressure fluidity is imparted to a boron-containing resin, the monomer (other monomer) that gives the repeating unit represented by B is a resin having pressure fluidity described later (having two compatibility curves). A preferred example is a copolymer component (monomer) of a block copolymer (block copolymer of block A and block B) exemplified as (resin).
That is, in the general formula (1), B preferably represents a site corresponding to a block copolymer (a block copolymer of block A and block B).

In addition, in the case of imparting pressure fluidity to the boron-containing resin, the boron-containing resin is a block copolymer (block A and a block A) exemplified as a resin having pressure fluidity (a resin having two compatibility curves) described later. A resin in which a monomer having a boron-containing group is further introduced into a block copolymer with the block B) may be used.
That is, the boron-containing resin is a block copolymer of block A and block B obtained by further polymerizing a monomer having a boron-containing group on at least one of block A and block B in the block copolymer. Also good.
The introduction amount of the monomer having a boron-containing group is, for example, preferably from 1 mol% to 50 mol%, and more preferably from 2 mol% to 30 mol%, based on the entire block copolymer.

-Diol compound-
As the diol compound, a compound having a diol structure is applied. Examples of the diol structure include a compound having a 1,2-diol structure and a 1,3 diol structure.
Specific examples of the diol compound include, for example, a monomer having a diol structure (diol low molecular weight compound), a homopolymer of a monomer having a diol structure (diol polymer compound), or a monomer having a diol structure. Examples thereof include copolymers with other monomers (diol polymer compounds).

Examples of the monomer having a 1,2-diol structure include saccharides, monoglycerin (meth) acrylate, 3,4-dihydroxybutyl acrylate, 9,10-dihydroxydecyl (meth) acrylate, (meth) Examples thereof include saccharide esters of acrylic acid.
Examples of the monomer having a 1,3-diol structure include saccharides, monoglycerin (meth) acrylate, and esters of saccharides of (meth) acrylic acid.

  On the other hand, examples of other monomers include (meth) acrylic acid alkyl esters [for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, N-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (meth ) (Lauric acid acrylate), (meth) acrylic acid C1-18 alkyl ester such as stearyl (meth) acrylate], (meth) acrylic acid cycloalkyl ester [(meth) acrylic acid cyclohexyl etc.], (meth) acrylic acid aryl Esters [phenyl (meth) acrylate, etc.], aralkyl esters [(meth) actyl Benzyl yllate, etc.], substituted (meth) acrylic acid alkyl esters [eg, 2-hydroxyethyl (meth) acrylate, etc.], (meth) acrylamides [eg, (meth) acrylamide, dimethyl (meth) acrylamide, etc.], Aromatic vinyls [styrene, vinyl toluene, α-methylstyrene, etc.], vinyl esters [vinyl acetate, vinyl propionate, vinyl benzoate, vinyl versatate, etc.], allyl esters [eg, allyl acetate], halogen-containing single Examples include monomers [vinylidene chloride, vinyl chloride, etc.], vinyl cyanides [(meth) acrylonitrile, etc.], olefins [ethylene, propylene, etc.] and the like.

  In particular, when the toner according to the exemplary embodiment is used in a heat fixing method, that is, when heat-meltability is imparted to a diol polymer compound, examples of other monomers include methyl (meth) acrylate, ( Particularly preferred are ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, benzyl (meth) acrylate, styrene, vinyl benzoate, and mixtures thereof.

  On the other hand, when the toner according to the exemplary embodiment is used in a pressure fixing method, that is, when pressure fluidity is imparted to the diol polymer compound, examples of other monomers include n-butyl (meth) acrylate. , T-butyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, styrene, and mixtures thereof, etc. Preferably mentioned.

  In particular, in the case of imparting pressure fluidity to the diol polymer compound, as another monomer, a block copolymer exemplified as a resin having pressure fluidity (a resin having two compatibility curves) described later ( A copolymer component (monomer) of a block copolymer of block A and block B) is preferably mentioned.

In addition, when pressure fluidity is imparted to the diol polymer compound, the diol polymer compound is a block copolymer (block) exemplified as a resin having pressure fluidity (resin having two compatibility curves), which will be described later. A resin in which a monomer having a diol structure is further introduced into a block copolymer of A and block B) may be used.
That is, the diol polymer compound is a block copolymer of block A and block B obtained by further polymerizing a monomer having a diol structure on at least one of block A and block B in the block copolymer. Also good.

  Among the diol compounds, in the diol polymer compound, the ratio (molar ratio) between the monomer having a diol structure and another monomer is preferably 1 mol% or more and 100 mol% or less, preferably 1 It is from mol% to 50 mol%, more preferably from 2 mol% to 30 mol%.

  As the diol compound, a polymer capable of forming a 1,3-diol structure may be used. Examples of the polymer capable of forming a 1,3-diol structure include polyvinyl alcohol and derivatives thereof, polyvinyl acetal and derivatives thereof, and polyvinyl butyral and derivatives thereof. "

-Content of boron compound and diol compound-
The contents of the boron compound and the diol compound are each preferably, for example, 0.05 meq / g or more and 3.0 meq / g or less, and desirably 0.01 meq / g or more and 2.0 mm or less. Equivalent / g or less.
By setting the content within the above range, it is easy to improve the scratch strength of the fixed image without affecting the toner characteristics.
The “milli equivalent / g” means milliequivalents (1/1 of the number of moles) of each functional group of boric acid group, boronic acid group, borinic acid group, ester group thereof, or diol group in 1 g of toner. 1000).

-Toner particles containing boron compound-
Examples of toner particles containing a boron compound include the following toner particles.
A) Toner particles in which, for example, a colorant, a release agent, and other additives are dispersed in the binder resin, and contain a boron compound (boron-containing resin) as the binder resin, or in the binder resin A toner containing a boron compound as another component to be dispersed and blended (hereinafter referred to as boron-containing resin-type toner particles).
B) For example, the core material including a resin component, a colorant, a release agent, and other additives is toner particles encapsulated in the capsule wall, and includes a boron compound as a resin component of the core material. Alternatively, toner particles containing a boron compound as another component of the core material (hereinafter referred to as boron-containing capsule-type toner particles).
In addition, a coloring agent, a mold release agent, and other additives are used as needed.

First, the boron-containing resin type toner particles will be described.
The boron-containing resin-type toner particles include, for example, a binder resin, a colorant, a release agent, and other additives.
And it is comprised including a boron compound (boron containing resin) as a binder resin, or a boron compound as another component.
In particular, the boron-containing resin-type toner particles preferably include a boron compound (boron-containing resin) as a binder resin. Of course, you may use together with other binder resin.

  The binder resin other than the boron compound (boron-containing resin) is not particularly limited when the toner according to the present embodiment is employed in the thermal fixing method. For example, styrene, parachlorostyrene, α-methylstyrene, etc. Styrenes; methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, lauryl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, lauryl methacrylate , Esters having a vinyl group such as 2-ethylhexyl methacrylate; vinyl nitriles such as acrylonitrile and methacrylonitrile; vinyl ethers such as vinyl methyl ether and vinyl isobutyl ether; vinyl methyl ketone, vinyl ethyl ketone, vinyl isopropenyl keto Vinyl ketones and the like; ethylene, propylene, homopolymer consisting of a monomer, such as polyolefins such as butadiene, or a copolymer obtained by combining two or more of these, more mixtures thereof. In addition, epoxy resins, polyester resins, polyurethane resins, polyamide resins, cellulose resins, polyether resins, etc., non-vinyl condensation resins, mixtures of these with vinyl resins, and polymerization of vinyl monomers in the presence of these resins The graft polymer obtained by this is mentioned.

  The glass transition temperature of these binder resins is desirably in the range of 40 ° C. or higher and 80 ° C. or lower. When the glass transition temperature is in the above range, the heat-resistant blocking property and the minimum fixing temperature are maintained.

  In addition, the binder resin other than the boron compound (boron-containing resin) is not particularly limited when the toner according to the present embodiment is used in the pressure fixing method, and examples thereof include a resin having pressure fluidity.

  The resin having pressure fluidity is a resin having a “baroplastic” characteristic in which the resin melt viscosity is reversibly lowered depending on the pressure, and has two compatibility curves [UDOT (non- Resin having a boundary temperature at which a change from a compatible state to a compatible state occurs (Upper Disorder to Order Transition) and LDOT (a boundary temperature at which a change from a disordered state to an ordered state: Lower Disorder to Order Transition) occurs. .

A resin having two compatibility curves is softened to the extent that the toner is fixed within a certain pressure range (fluidized by compatibility), but a pressure exceeding a certain level is applied (development trimmer in the apparatus). In the case of cleaning with a cleaning blade), a characteristic of being hardened again (non-fluidized by phase separation) is imparted.
In other words, the resin having two compatibility curves uses the compatibilization (fluidization) due to the decrease in UDOT under the toner fixing pressure to improve the fixability, and at the same time, the LDOT decreases under higher pressure. The incompatibility (non-fluidization) due to is used to improve stress resistance.

Specifically, the resin having two compatibility curves is preferably a block copolymer composed of a block obtained by polymerizing an ethylenically unsaturated compound, for example.
The ethylenically unsaturated compound is a compound having at least one ethylenically unsaturated bond, and is preferably an addition polymerizable compound, and any of anionic polymerizable, cationic polymerizable, radical polymerizable, and coordination polymerizable Among them, a radical polymerizable ethylenic addition polymerizable compound is desirable among them.

  The block copolymer includes a block A having a glass transition temperature of 55 ° C. or higher (hereinafter also simply referred to as “block A”) and a block B having a glass transition temperature of 40 ° C. or lower (hereinafter also simply referred to as “block B”). .) Is preferably a block copolymer.

The glass transition temperature of the block A (hereinafter also referred to as “Tg (A)”) is preferably 55 ° C. or higher, more preferably 55 ° C. or higher and 150 ° C. or lower, and further preferably 70 ° C. or higher and 120 ° C. or lower.
The block A is preferably a non-crystalline polymer.

  Here, the glass transition temperature is, for example, a method defined in ASTM D3418-82 when a differential scanning calorimeter (DSC) is used to measure from −80 ° C. to 150 ° C. at a heating rate of 10 ° C. per minute. It is the value measured by.

  On the other hand, the glass transition temperature of the block B (hereinafter also referred to as “Tg (B)”) is preferably 40 ° C. or lower, and more preferably −100 ° C. or higher and 30 ° C. or lower.

  Furthermore, the difference {Tg (A) −Tg (B)} between Tg (A) and Tg (B) is preferably 50 ° C. or higher, more preferably 70 ° C. or higher and 200 ° C. or lower, 80 ° C. More preferably, it is 180 ° C. or lower.

Examples of radical polymerizable addition polymerizable compounds used in the block copolymer include styrenes (styrene and / or derivatives thereof), (meth) acrylic acid esters (“(meth) acrylic acid ester”, etc. Synonymous with “acrylic acid ester and / or methacrylic acid ester” and the like hereinafter, and the like), ethylenically unsaturated nitriles, ethylenically unsaturated carboxylic acids, vinyl ethers, vinyl ketones, olefins and the like.
Of these, styrenes (styrene and / or derivatives thereof) and (meth) acrylic acid esters are desirable.

The block A is desirably a polymer derived from styrenes (styrene and / or derivatives thereof). Examples of the styrenes include styrene and styrene derivatives having 1 or more and 3 or less linear or branched alkyl groups having 1 to 5 carbon atoms. More specifically, styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, p-ethylstyrene, pn-butylstyrene, p-tert-butylstyrene, 2,4-dimethylstyrene and the like can be mentioned. Among them, styrene, o-methylstyrene, m-methylstyrene, and p-methylstyrene are preferable, and styrene is more preferable.
For the purpose of adjusting Tg (A), the block A may contain a monomer unit derived from an alkyl acrylate having an alkyl group having 1 to 10 carbon atoms as a copolymerization component. As the alkyl acrylate, butyl acrylate or the like is desirable. The copolymerization ratio of monomer units derived from an alkyl acrylate having an alkyl group having 1 to 10 carbon atoms is preferably 20% by weight or less, more preferably 10% by weight or less, where the weight of the block A is 100% by weight.
The block A is preferably a non-crystalline polymer.

On the other hand, the block B is desirably a polymer derived from (meth) acrylates. As (meth) acrylates, methacrylates are desirable.
As the methacrylates, those having an alkyl group having 1 to 6 carbon atoms are desirable, among which ethyl methacrylate and butyl methacrylate are particularly desirable, and butyl methacrylate is particularly desirable from the viewpoint of material availability. When ethyl methacrylate or butyl methacrylate is used, a block copolymer that draws two compatibility curves is obtained, which is desirable.

  As the block A and the block B contained in the block copolymer, a homopolymer derived from any one of these ethylenically unsaturated compounds or a copolymer obtained by copolymerizing two or more of these is used.

  Assuming that the total amount of the block A and the block B in the block copolymer is 100% by weight, the proportion of the block A is preferably 30% by weight to 70% by weight, and more preferably 40% by weight to 60% by weight.

The block copolymer is particularly preferably a block copolymer composed of a block A derived from styrenes and a block derived from butyl methacrylate or a block B derived from polyethyl methacrylate.

  Each block contained in the block copolymer preferably has a number average molecular weight of 10,000 or more and 100,000 or less, more preferably 15,000 or more and 80,000 or less, and 20,000 or more and 80 or less. More desirably, it is 1,000 or less.

Here, the number average molecular weight is measured by, for example, gel permeation chromatography (HLC-8120GPC, TSK-GEL, GMH column manufactured by Tosoh Corporation).

In the preparation of the block copolymer, various living polymerization methods such as an ionic polymerization method and a living radical polymerization method are used, but it is desirable to use the living radical polymerization method because of the ease of combining the monomers. .
In this case, as a living radical polymerization method, an NMRP method (Nitroxide Radiated Polymerization), an ATRP method (Atom Transfer Radical Polymerization), a RAFT method (Reversible Addition Fragmentation method, etc.) is used. Of these, the NMRP method is desirable.

  As the nitroxide compound used in the NMRP method, a known nitroxide compound used in the living radical polymerization method is used, and specifically, JP 2004-307502 A, JP 2005-126442 A, JP 2007-518843 A. And the compounds described in Japanese Patent No. 4081112 are used.

  The colorant is not particularly limited as long as it is a known colorant. For example, carbon black such as furnace black, channel black, acetylene black, and thermal black, inorganic pigments such as bengara, bitumen, and titanium oxide, fast yellow, disazo Azo pigments such as yellow, pyrazolone red, chelate red, brilliant carmine, para brown, phthalocyanine pigments such as copper phthalocyanine, metal-free phthalocyanine, flavantron yellow, dibromoanthrone orange, perylene red, quinacridone red, dioxazine violet Examples thereof include cyclic pigments.

  As the colorant, a surface-treated colorant may be used as necessary, or it may be used in combination with a dispersant. A plurality of colorants may be used in combination.

  The content of the colorant is preferably in the range of 1 part by weight to 30 parts by weight with respect to 100 parts by weight of the binder resin.

  Examples of mold release agents include hydrocarbon waxes; natural waxes such as carnauba wax, rice wax, and candelilla wax; synthetic or mineral / petroleum waxes such as montan wax; ester types such as fatty acid esters and montanic acid esters. Wax; and the like, but is not limited thereto.

  The melting point of the release agent is preferably 50 ° C. or higher, and more preferably 60 ° C. or higher, from the viewpoint of storage stability. Further, from the viewpoint of offset resistance, the temperature is desirably 110 ° C. or less, and more desirably 100 ° C. or less.

  The content of the release agent is preferably 1% by weight to 15% by weight, more preferably 2% by weight to 12% by weight, and even more preferably 3% by weight to 10% by weight.

  Examples of other additives include magnetic materials, charge control agents, and inorganic powders.

The volume average particle diameter of the boron-containing resin type toner particles is, for example, 3 μm or more and 15 μm or less, and desirably 5 μm or more and 10 μm or less.
As a method for measuring the volume average particle diameter of the toner particles, 0.5 mg to 50 mg of a measurement sample is added to 2 ml of a 5% by weight aqueous solution of a surfactant, preferably sodium alkylbenzenesulfonate as a dispersant. The electrolyte was added to 100 ml or more and 150 ml or less. The electrolytic solution in which the measurement sample is suspended is subjected to a dispersion treatment with an ultrasonic disperser for about 1 minute, and a particle size is measured with a Coulter Multisizer II type (manufactured by Beckman-Coulter) using an aperture having an aperture diameter of 100 μm Is a particle size distribution of particles in the range of 2.0 μm to 60 μm. The number of particles to be measured is 50,000.
For the particle size range (channel) obtained by dividing the obtained particle size distribution, the volume cumulative distribution is subtracted from the small particle size side, and the particle size that becomes 50% cumulative is defined as the volume average particle size D50v.

  Boron-containing resin-type toner particles can be produced by a dry production method (for example, a kneading and pulverizing method), a wet production method (for example, an aggregation coalescence method, a suspension polymerization method, a dissolution suspension granulation method, a dissolution suspension method, a dissolution emulsification method). It may be produced by any one of agglomeration and coalescence methods. There is no restriction | limiting in particular in these manufacturing methods, A well-known manufacturing method is employ | adopted.

Next, the boron-containing capsule toner particles will be described.
The boron-containing capsule-type toner particles include a core material that includes a resin component, a colorant, a release agent, and other additives, and a capsule wall that is coated so as to enclose the core material.
The boron-containing capsule-type toner particles include a boron compound (boron-containing resin) as a resin component of the core material, or a boron compound as another component of the core material.
In particular, the boron-containing capsule toner particles preferably contain a boron compound (boron-containing resin) as a resin component. Of course, you may use together with another binding component.
Here, the boron-containing capsule-type toner particles are those in which the capsule wall is broken by heat fixing or pressure fixing, and a core material having fluidity (softness) flows to form a fixed image.

  The resin component other than the boron compound (boron-containing resin) is not particularly limited. For example, poly (meth) methyl acrylate, poly (meth) ethyl acrylate, poly (meth) butyl acrylate, poly (meth) (Meth) acrylate polymers such as 2-ethylhexyl acrylate and poly (meth) acrylate lauryl; copolymers of styrenic monomers and (meth) acrylate; polyvinyl acetate, vinyl propionate, poly Ethylene polymers such as vinyl butyrate, polyethylene and polypropylene and copolymers thereof; Styrene copolymers such as styrene / butadiene copolymers, styrene / isoprene copolymers, styrene / maleic acid copolymers; polyvinyl ethers, Polyvinyl ketone, polyester, polyamide, polyurethane, rubber, epoxy Fat, polyvinyl butyral, rosin, modified rosin, terpene resins, phenol resins and the like.

  The material constituting the capsule wall is not particularly limited, and examples thereof include epoxy resins, polyamide resins, polyurethane resins, polyurea resins, epoxy urea resins, epoxy urethane resins, vinyl resins, and the like. Polyurethane resin, polyurea resin, epoxy urea resin, and epoxy urethane resin are desirable.

  The colorant, release agent, and other additives are the same as those for the boron-containing resin type toner particles.

  As a method for producing the boron-containing capsule-type toner particles, for example, a well-known production method such as a spray drying method, an interfacial polymerization method, a coacervation method, an in-situ polymerization method, or a phase separation method is employed.

-Toner particles containing a diol compound-
Examples of the toner particles containing a diol compound include the following toner particles.
A) Toner particles in which, for example, a colorant, a release agent, and other additives are dispersed in the binder resin, the binder resin contains a diol compound (diol-containing resin) or is dispersed in the binder resin. A toner containing a diol compound as another component to be blended (hereinafter referred to as diol-containing resin-type toner particles).
B) For example, a core material comprising a resin component, a colorant, a release agent, and other additives is toner particles encapsulated in a capsule wall, and contains a diol compound as a resin component of the core material. Alternatively, toner particles containing a diol compound as another component of the core material (hereinafter referred to as diol-containing capsule-type toner particles).

  Here, the diol-containing resin-type toner particles and the diol-containing capsule-type toner particles have the same configuration except that, in the boron-containing resin-type toner particles and the boron-containing capsule-type toner particles, a diol compound is used instead of the boron compound. It is good to do.

-External additive containing boron compound-
The external additive containing the boron compound may be a particulate material of the boron compound alone or an inorganic component such as a boron compound and other components (for example, carbon black, silica, titanium oxide, alumina, zinc oxide, cerium oxide, strontium titanate, calcium carbonate). Particulates containing fine particles).
The volume average particle diameter of the external additive containing a boron compound is, for example, preferably from 5 nm to 5 μm, preferably from 10 nm to 2 μm, more preferably from 20 nm to 1 μm.
In addition, the volume average particle diameter of the external additive refers to a value measured using a laser diffraction particle size distribution measuring apparatus (LA-700: manufactured by Horiba, Ltd.). 2 g of a measurement sample is added to 50 ml of a 5% by weight aqueous solution of a surfactant, preferably sodium alkylbenzenesulfonate, and dispersed for 2 minutes with an ultrasonic disperser (1,000 Hz), and ion-exchanged water is added to the resulting dispersion. To about 40 ml. This is put into the cell until an appropriate concentration is reached, waits for about 2 minutes, and is measured when the concentration in the cell becomes almost stable. The obtained volume average particle diameter for each channel is accumulated from the smaller volume average particle diameter, and the place where the accumulation reaches 50% is defined as the volume average particle diameter.

-External additive containing diol compound-
The external additive containing the diol compound may be a granule of the diol compound alone or an inorganic component such as a diol compound and other components (for example, carbon black, silica, titanium oxide, alumina, zinc oxide, cerium oxide, strontium titanate, calcium carbonate, etc. Particulates containing fine particles).
The volume average particle size of the external additive containing a diol compound is, for example, preferably 5 nm or more and 5 μm or less, desirably 10 nm or more and 2 μm or less, and more desirably 20 nm or more and 1 μm or less.

-Other toner particles and external additives-
Well-known toner particles and external additives are used as toner particles and external additives that do not contain boron compounds and diol compounds and that can be used together with toner particles and external additives containing boron compounds and diol compounds.

-Toner production method-
The toner according to the exemplary embodiment is manufactured, for example, by adding an external additive to the obtained toner particles and mixing them. Mixing is preferably performed by, for example, a V blender, a Henshur mixer, a ladyge mixer or the like. Further, if necessary, coarse toner particles may be removed using a vibration classifier, a wind classifier, or the like.

(Electrostatic image developer)
The electrostatic charge image developer according to the exemplary embodiment includes at least the toner according to the exemplary embodiment.
The electrostatic image developer according to this embodiment may be a one-component developer including only the toner according to this embodiment, or may be a two-component developer mixed with the toner and a carrier.

  There is no restriction | limiting in particular as a carrier, A well-known carrier is mentioned. Examples of the carrier include a resin-coated carrier, a magnetic dispersion carrier, a resin dispersion carrier, and the like.

  In the two-component developer, the mixing ratio (weight ratio) of the toner according to the exemplary embodiment and the carrier is preferably in the range of toner: carrier = 1: 100 to 30: 100, and about 3: 100 to 20: 100. The range of is more desirable.

(Image forming apparatus / image forming method)
Next, the image forming apparatus / image forming method according to the present embodiment will be described.
An image forming apparatus according to the present embodiment includes an image carrier, a charging unit that charges the image carrier, an electrostatic image forming unit that forms an electrostatic image on the surface of the charged image carrier, and an electrostatic image development. A developing means for accommodating the developer and developing the electrostatic image formed on the image carrier as a toner image by the electrostatic image developer, and transferring the toner image formed on the image carrier onto the transfer target And a fixing unit that fixes the toner image transferred onto the transfer target. The electrostatic image developer according to the present embodiment is applied as the electrostatic image developer.

  In the image forming apparatus according to the present embodiment, for example, the part including the developing unit may have a cartridge structure (process cartridge) that is detachable from the image forming apparatus. As the process cartridge, for example, A process cartridge that accommodates the electrostatic charge image developer according to the exemplary embodiment and includes a developing unit is preferably used.

  The image forming method according to the present embodiment contains a charging step for charging the image carrier, an electrostatic charge image forming step for forming an electrostatic charge image on the surface of the charged image carrier, and an electrostatic charge image developer. A developing step of developing the electrostatic image formed on the image carrier as a toner image with an electrostatic charge image developer, and a transfer step of transferring the toner image formed on the image carrier onto the transfer target; And a fixing step of fixing the toner image transferred onto the transfer medium. And as the electrostatic charge image developer, the electrostatic charge image developer according to the present embodiment is applied.

  Hereinafter, an example of the image forming apparatus according to the present embodiment will be described, but the present invention is not limited thereto. The main part shown in the figure will be described, and the description of other parts will be omitted.

  FIG. 1 is a schematic configuration diagram showing a four-tandem color image forming apparatus. The image forming apparatus shown in FIG. 1 is a first to first electrophotographic method that outputs yellow (Y), magenta (M), cyan (C), and black (K) images based on color-separated image data. Fourth image forming units 10Y, 10M, 10C, and 10K (image forming means) are provided. These image forming units (hereinafter sometimes simply referred to as “units”) 10Y, 10M, 10C, and 10K are arranged in parallel at a predetermined distance from each other in the horizontal direction. The units 10Y, 10M, 10C, and 10K may be process cartridges that are detachable from the main body of the image forming apparatus.

Above each of the units 10Y, 10M, 10C, and 10K, an intermediate transfer belt 20 as an intermediate transfer member is extended through each unit. The intermediate transfer belt 20 is provided by being wound around a driving roller 22 and a support roller 24 that are in contact with the inner surface of the intermediate transfer belt 20 that are spaced apart from each other from the left to the right in the drawing. The vehicle travels in the direction toward the unit 10K. A force is applied to the support roller 24 in a direction away from the drive roller 22 by a spring or the like (not shown), and tension is applied to the intermediate transfer belt 20 wound around the both. Further, an intermediate transfer member cleaning device 30 is provided on the side of the image carrier of the intermediate transfer belt 20 so as to face the driving roller 22.
Further, each of the developing devices (developing means) 4Y, 4M, 4C, and 4K of the units 10Y, 10M, 10C, and 10K has yellow, magenta, cyan, and black contained in the toner cartridges 8Y, 8M, 8C, and 8K. The toner including the four color toners can be supplied.

  Since the first to fourth units 10Y, 10M, 10C, and 10K described above have the same configuration, here, the first image that forms the yellow image disposed on the upstream side in the intermediate transfer belt traveling direction is formed. The unit 10Y will be described as a representative. Note that the second to fourth components are denoted by reference numerals with magenta (M), cyan (C), and black (K) instead of yellow (Y) in the same parts as the first unit 10Y. Description of the units 10M, 10C, and 10K will be omitted.

The first unit 10Y includes a photoreceptor 1Y that functions as an image holding member. Around the photosensitive member 1Y, a charging roller 2Y for charging the surface of the photosensitive member 1Y to a predetermined potential, and the charged surface is exposed by a laser beam 3Y based on the color-separated image signal to form an electrostatic charge image. An exposure device (electrostatic image forming means) 3 for forming, a developing device (developing means) 4Y for supplying the charged toner to the electrostatic image and developing the electrostatic image, and transferring the developed toner image onto the intermediate transfer belt 20 A primary transfer roller 5Y (primary transfer unit) that performs the transfer and a photoconductor cleaning device (cleaning unit) 6Y that removes toner remaining on the surface of the photoconductor 1Y after the primary transfer are sequentially arranged.
The primary transfer roller 5Y is disposed inside the intermediate transfer belt 20, and is provided at a position facing the photoreceptor 1Y. Further, a bias power source (not shown) for applying a primary transfer bias is connected to each of the primary transfer rollers 5Y, 5M, 5C, and 5K. Each bias power source varies the transfer bias applied to each primary transfer roller under the control of a control unit (not shown).

Hereinafter, an operation of forming a yellow image in the first unit 10Y will be described. First, prior to the operation, the surface of the photoreceptor 1Y is charged to a potential of about −600V to −800V by the charging roller 2Y.
The photoreceptor 1Y is formed by laminating a photosensitive layer on a conductive substrate (volume resistivity at 20 ° C .: 1 × 10 ⁻⁶ Ωcm or less). This photosensitive layer usually has a high resistance (a resistance equivalent to that of a general resin), but has a property that the specific resistance of the portion irradiated with the laser beam changes when irradiated with the laser beam 3Y. Therefore, a laser beam 3Y is output to the surface of the charged photoreceptor 1Y via the exposure device 3 in accordance with yellow image data sent from a control unit (not shown). The laser beam 3Y is applied to the photosensitive layer on the surface of the photoreceptor 1Y, whereby an electrostatic charge image of a yellow print pattern is formed on the surface of the photoreceptor 1Y.

The electrostatic charge image is an image formed on the surface of the photoreceptor 1Y by charging, and the specific resistance of the irradiated portion of the photosensitive layer is lowered by the laser beam 3Y, and the charged charge on the surface of the photoreceptor 1Y flows. On the other hand, this is a so-called negative latent image formed by the charge remaining in the portion not irradiated with the laser beam 3Y.
The electrostatic charge image formed on the photoreceptor 1Y in this way is rotated to a predetermined development position as the photoreceptor 1Y travels. At this development position, the electrostatic charge image on the photoreceptor 1Y is visualized (developed image) by the developing device 4Y.

  In the developing device 4Y, for example, an electrostatic charge image developer according to the present embodiment including at least yellow toner and a carrier is accommodated. The yellow toner is triboelectrically charged by being agitated inside the developing device 4Y, and has a charge of the same polarity (negative polarity) as the charged charge on the photoreceptor 1Y, and a developer roll (developer holder). Is held on. As the surface of the photoreceptor 1Y passes through the developing device 4Y, the yellow toner is electrostatically attached to the latent image portion on the surface of the photoreceptor 1Y, and the latent image is developed with the yellow toner. . The photoreceptor 1Y on which the yellow toner image is formed continues to run at a predetermined speed, and the toner image developed on the photoreceptor 1Y is conveyed to a predetermined primary transfer position.

When the yellow toner image on the photoreceptor 1Y is conveyed to the primary transfer, a primary transfer bias is applied to the primary transfer roller 5Y, and an electrostatic force from the photoreceptor 1Y toward the primary transfer roller 5Y acts on the toner image. Then, the toner image on the photoreceptor 1Y is transferred onto the intermediate transfer belt 20. The transfer bias applied at this time is a (+) polarity opposite to the polarity (−) of the toner, and is controlled to about +10 μA by the control unit (not shown) in the first unit 10Y, for example.
On the other hand, the toner remaining on the photoreceptor 1Y is removed and collected by the cleaning device 6Y.

Further, the primary transfer bias applied to the primary transfer rollers 5M, 5C, and 5K after the second unit 10M is also controlled according to the first unit.
Thus, the intermediate transfer belt 20 onto which the yellow toner image has been transferred by the first unit 10Y is sequentially conveyed through the second to fourth units 10M, 10C, and 10K, and the toner images of the respective colors are superimposed and transferred in a multiple manner. The

  The intermediate transfer belt 20 onto which the four color toner images have been transferred in multiple layers through the first to fourth units is arranged on the image transfer surface side of the intermediate transfer belt 20, the support roller 24 in contact with the inner surface of the intermediate transfer belt 20. The secondary transfer roller (secondary transfer means) 26 is connected to a secondary transfer portion. On the other hand, the recording paper (transfer object) P is fed at a predetermined timing to the gap where the secondary transfer roller 26 and the intermediate transfer belt 20 are pressed against each other via the supply mechanism, and the secondary transfer bias is supported. Applied to the roller 24. The transfer bias applied at this time is a (−) polarity that is the same polarity as the polarity (−) of the toner, and an electrostatic force from the intermediate transfer belt 20 toward the recording paper P is applied to the toner image, so The toner image is transferred onto the recording paper P. Note that the secondary transfer bias at this time is determined according to the resistance detected by a resistance detecting means (not shown) for detecting the resistance of the secondary transfer portion, and is voltage-controlled.

Thereafter, the recording paper P is sent to the pressure contact portions (nip portions) of the pair of fixing rolls in the fixing device (roll-type fixing unit) 28, and the toner image is fixed on the recording paper P, thereby forming a fixed image.
Here, when the thermal fixing method is adopted, the toner image is heated, and the color-superposed toner image is melted and fixed on the recording paper P.
On the other hand, when the pressure fixing method is adopted, the toner image is applied with pressure at a temperature of 40 ° C. or lower (specifically, room temperature or in-machine temperature), and the color-superposed toner image flows and flows on the recording paper P. Established.
Note that the pressure applied to the toner image in this pressure fixing method may be, for example, 0.2 MPa to 10 MPa (desirably 0.5 MPa to 5 MPa).

Examples of the transfer target to which the toner image is transferred include plain paper, OHP sheet, and the like used for electrophotographic copying machines and printers.
In order to further improve the smoothness of the image surface after fixing, it is desirable that the surface of the transfer target is as smooth as possible. For example, coated paper in which the surface of plain paper is coated with resin, art for printing Paper or the like is preferably used.

The recording paper P on which the color image has been fixed is carried out toward the discharge unit, and a series of color image forming operations is completed.
The image forming apparatus exemplified above is configured to transfer the toner image onto the recording paper P via the intermediate transfer belt 20, but is not limited to this configuration, and the toner image is directly transferred from the photoreceptor. It may be a structure that is transferred to a recording sheet.

<Process cartridge, toner cartridge>
FIG. 2 is a schematic configuration diagram showing an embodiment of a preferred example of a process cartridge containing an electrostatic charge image developer according to this embodiment. In the process cartridge 200, a charging roller 108, a developing device 111, a photoconductor cleaning device 113, an opening 118 for exposure, and an opening 117 for static elimination exposure are combined using a mounting rail 116 together with the photoconductor 107. , And integrated. In FIG. 2, reference numeral 300 denotes a transfer target.
The process cartridge 200 is detachable from an image forming apparatus including a transfer device 112, a fixing device 115, and other components not shown.

  The process cartridge 200 shown in FIG. 2 includes a charging device 108, a developing device 111, a cleaning device 113, an opening 118 for exposure, and an opening 117 for static elimination exposure. Can be combined. In the process cartridge according to the present embodiment, in addition to the photosensitive member 107, the charging device 108, the developing device 111, the cleaning device (cleaning means) 113, the opening 118 for exposure, and the opening 117 for static elimination exposure. At least one selected from the group consisting of:

  Next, the toner cartridge according to this embodiment will be described. The toner cartridge according to the present exemplary embodiment is a toner cartridge that is detachably attached to the image forming apparatus and stores at least a replenishment electrostatic image developing toner to be supplied to a developing unit provided in the image forming apparatus.

  The image forming apparatus shown in FIG. 1 is an image forming apparatus having a configuration in which the toner cartridges 8Y, 8M, 8C, and 8K can be attached and detached, and the developing devices 4Y, 4M, 4C, and 4K are respectively the developing devices ( And a toner supply pipe (not shown). Further, when the amount of toner stored in the toner cartridge becomes low, the toner cartridge is replaced.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, these examples do not limit the present invention. In the text, “part” means “part by mass” and “%” means “mass%” unless otherwise specified.

[Synthesis of boron compounds]
(Synthesis of boron-containing resin 1)
In a reactor containing 30 parts of xylene, 25 parts of styrene, 10 parts of butyl acrylate, 1.2 parts of 2-carboxyethyl acrylate, 4 parts of 4-vinylphenylboronic acid, di-tert- 0.2 part of butyl peroxide and 10 parts of xylene were added dropwise over 2 hours. After completion of the dropwise addition, 0.2 part of di-tert-butyl peroxide was added and the mixture was further refluxed for 2 hours. The boron-containing resin 1 was obtained by reprecipitation of the obtained reaction liquid with methanol and vacuum drying. The weight average molecular weight calculated by GPC analysis (gel permeation chromatography analysis) with a THF (tetrahydrofuran) solution was 32000 (polystyrene conversion).

(Synthesis of boron-containing resin 2)
45 parts of butyl acrylate, 5 parts of 4-vinylphenylboronic acid and 0.2 parts of radical polymerization initiator (TEMPO “2,2,6,6-tetramethyl-1-piperidinyloxy”, VAZO 88 “1,1- Azobis (1-cyclohexanecarbonitrile: 0.1 part of Kaneka Chemical Co., Ltd.) was added, and a polymerization reaction was performed at 120 ° C., and then 50 parts of a styrene monomer was added to further perform a polymerization reaction. The obtained reaction solution was dissolved in THF and reprecipitated with methanol to obtain boron-containing resin 2. The weight average molecular weight calculated by GPC analysis with the THF solution was 30000 (polystyrene conversion).

[Synthesis of Diol Compound]
(Synthesis Example 3: Synthesis of diol-containing resin 1)
In a reactor containing 30 parts of xylene, 25 parts of styrene, 10 parts of butyl acrylate, 1.2 parts of 2-carboxyethyl acrylate, 4 parts of glycerol monomethacrylate, di-tert-butyl peroxide while refluxing in a nitrogen stream 0.2 part and 10 parts of xylene were dripped over 2 hours. After completion of the dropwise addition, 0.2 part of di-tert-butyl peroxide was added and the mixture was further refluxed for 2 hours. The obtained reaction liquid was reprecipitated with methanol and vacuum-dried to obtain a diol-containing resin 1. The weight average molecular weight calculated by GPC analysis with the THF solution was 28000 (polystyrene conversion).

(Synthesis Example 4: Synthesis of diol-containing resin 2)
A radical polymerization initiator (TEMPO 0.2 part, VAZO 88 0.1 part) is added to 45 parts of butyl acrylate and 5 parts of glycerin monomethacrylate, followed by polymerization at 120 ° C., and then 50 parts of styrene monomer is added for further polymerization. Reaction was performed. The resulting reaction solution was dissolved in THF and reprecipitated with methanol to obtain diol-containing resin 2. The weight average molecular weight calculated by GPC analysis with the THF solution was 26000. (Polystyrene conversion)

[Manufacture of resin-type toner]
(Production of boron-containing resin-type toner particles 1)
Boron-containing resin 1: 90 parts Cyan pigment (manufactured by Dainichi Seika Kogyo Co., Ltd., Pigment Blue 15: 3 (copper phthalocyanine)): 5 parts Release agent (long-chain straight-chain fatty acid long-chain straight-chain saturated alcohol) ; Stearyl bebenate) 5 parts A mixture of toner raw materials having the above composition was kneaded with an extruder, pulverized, and then classified into fine particles and coarse particles by an air classifier, and a volume average particle size (average particle size) Boron-containing resin-type toner particles 1 having a diameter D50) of 8.2 μm were obtained.

(Production of boron-containing resin-type toner particles 2)
Boron-containing resin 2: 95 parts Cyan pigment (Pigment Blue 15: 3 (copper phthalocyanine) manufactured by Dainichi Seika Kogyo Co., Ltd.): 5 parts A mixture of toner raw materials having the above composition is kneaded with an extruder and pulverized. After that, fine particles and coarse particles were classified by a wind classifier to obtain boron-containing resin-type toner particles 2 having a volume average particle size (average particle size D50) of 8.6 μm.

(Production of boron-containing resin-type toner particles 3)
Styrene / butyl acrylate / 2-carboxyethyl acrylate copolymer (weight ratio 70/27/3; weight average molecular weight 20000): 85 parts Boron triphenyl: 5 parts Cyan pigment (manufactured by Dainichi Seika Kogyo Co., Ltd.) Pigment Blue 15: 3 (copper phthalocyanine)): 5 parts Release agent (long-chain straight-chain fatty acid long-chain straight-chain saturated alcohol; stearyl bebenate) 5 parts A mixture of toner raw materials having the above composition is kneaded with an extruder. After pulverization, fine particles and coarse particles were classified by a wind classifier to obtain boron-containing resin-type toner particles 3 having a volume average particle size (average particle size D50) of 7.9 μm.

(Production of diol-containing resin-type toner particles 1)
-Diol-containing resin 1: 90 parts-Cyan pigment (manufactured by Dainichi Seika Kogyo Co., Ltd., Pigment Blue 15: 3 (copper phthalocyanine)): 5 parts-Release agent (long-chain straight-chain fatty acid long-chain straight-chain saturated alcohol) ; Stearyl bebenate) 5 parts A mixture of toner raw materials having the above composition was kneaded with an extruder, pulverized, and then classified into fine particles and coarse particles by an air classifier, and a volume average particle size (average particle size) Diol-containing resin-type toner particles 1 having a diameter D50) of 8.0 μm were obtained.

(Production of diol-containing resin-type toner particles 2)
-Diol-containing resin 2: 95 parts-Cyan pigment (Pigment Blue 15: 3 (copper phthalocyanine) manufactured by Dainichi Seika Kogyo Co., Ltd.): 5 parts A mixture of toner raw materials having the above composition is kneaded with an extruder and pulverized. After that, fine particles and coarse particles were classified by a wind classifier to obtain diol-containing resin-type toner particles 2 having a volume average particle size (average particle size D50) of 8.6 μm.

(Production of diol-containing resin-type toner particles 3)
Styrene / butyl acrylate / 2-carboxyethyl acrylate copolymer (weight ratio 70/27/3; weight average molecular weight 20000): 85 parts Dipentaerythritol monooleate: 5 parts Cyan pigment (Daiichi Seikagaku ( Pigment Blue 15: 3 (Copper phthalocyanine)): 5 parts Release agent (long-chain linear fatty acid long-chain linear saturated alcohol; stearyl bebenate) 5 parts Extruded toner material mixture having the above composition After kneading and pulverizing with a rudder, fine particles and coarse particles are classified by an air classifier to obtain diol-containing resin-type toner particles 3 having a volume average particle size (average particle size D50) of 8.4 μm. It was.

(Preparation of boron-containing capsule-type toner particles 1)
To a mixed liquid of 30 parts of diethyl phthalate and 55 parts of ethyl acetate, 43 parts of boron-containing resin was added and dissolved. 116 parts of spherical magnetic particles (manufactured by Toda Kogyo Co., Ltd., MTS005HD: (maximum dimension / shortest dimension) ratio = 1.07) were added and dispersed in a ball mill for 24 hours. Next, 15 parts of aliphatic isocyanate (Takenate D110N manufactured by Takeda Pharmaceutical Company Limited) and 24 parts of ethyl acetate were added to 122 parts of this dispersion and mixed well. This liquid is called A liquid.

  On the other hand, 10 parts of hydroxypropylmethylcellulose (Metroze 65SH50 manufactured by Shin-Etsu Chemical Co., Ltd.) was dissolved in 200 parts of ion-exchanged water and cooled to 5 ° C. This liquid is designated as B liquid.

  Liquid B was stirred with an emulsifier (especially, an auto homomixer manufactured by Kikai Kogyo Co., Ltd.), and liquid A was slowly added into this to emulsify. In this way, an O / W emulsion having an average particle diameter of oil droplet particles in the emulsion of 12 μm was obtained. Next, instead of the emulsifier, the mixture was stirred at 400 rpm using a stirrer (manufactured by Shinto Kagaku Co., Ltd., Three-One Motor) equipped with a propeller-type stirring blade. Ten minutes later, 100 parts of a 2.5% aqueous solution of diethylenetriamine, the second capsule shell-forming monomer, was added dropwise thereto. After completion of the dropwise addition, an encapsulating reaction was performed for 1 hour while removing methyl ethyl ketone azeotropically at 90 ° C. After completion of the reaction, the reaction mixture was poured into 2 liters of ion-exchanged water and allowed to stand sufficiently, followed by standing. After the capsule particles settled, the supernatant was removed. This operation was repeated seven more times to wash the capsule particles.

Ion exchange water was added to the above capsule particles to prepare a suspension having a solid concentration of 40%. 125 parts of the prepared capsule particle suspension (corresponding to 50 parts of capsule particles) is placed in a 1-liter separable flask equipped with a cooling tube and a nitrogen introduction tube, and 125 parts of ion-exchanged water is added. The mixture was stirred at 200 rpm using a stirrer equipped with a mold stirring blade (manufactured by Shinto Kagaku Co., Ltd., Three-One Motor). To this was added 1.0 part diethylaminoethyl methacrylate, 2.0 parts methyl methacrylate and 1.6 parts potassium persulfate. Next, 0.5 part of sodium bisulfite was added and the reaction was carried out at 20 ° C. for 1 hour to adhere the charge control polymer to the capsule surface. After completion of the reaction, the reaction mixture was poured into 2 liters of ion exchange water and sufficiently stirred and allowed to stand. After the capsule particles settled, the supernatant was removed. This operation was repeated four more times to wash the capsule particles.
The obtained capsule suspension was opened in a stainless steel vat, dried at 60 ° C. for 10 hours in a dryer (manufactured by Yamato Kagaku Co., Ltd.), passed through a sieve of 100 mesh, and then again at 60 ° C. The mixture was heat-treated for a time and passed through a 325 mesh sieve to obtain boron-containing capsule-type toner particles 1.
The content of the polymer in the core material of the obtained capsule-type toner particles was 30% by weight with respect to the whole toner.

(Preparation of diol-containing capsule toner particles 1)
A diol-containing capsule-type toner particle 1 was obtained in the same manner as in the preparation of the boron-containing capsule-type toner particles, except that the boron-containing resin 1 was changed to the diol-containing resin 1.

[Example 1]
Boron-containing resin-type toner particles 1: 25 parts by mass, diol-containing resin-type toner particles 1: 25 parts by mass, hydrophobic silica (manufactured by Cabot, TS720, particle size 12 nm): 1 part by mass is added and mixed in a sample mill Thus, externally added toner 1 was obtained.
Then, using a ferrite carrier having an average particle diameter of 50 μm coated with 1% of polymethyl methacrylate (manufactured by Soken Chemical Co., Ltd.), the externally added toner 1 is weighed so that the toner concentration becomes 6%, and both are added by a ball mill. Developer 1 was prepared by stirring and mixing for 5 minutes.
Using the obtained developer 1, in a modified machine of DocuCenterColor f450 manufactured by Fuji Xerox Co., Ltd., using P1 paper as transfer paper, adjusting the fixing device temperature to 120 ° C. and the process speed to 180 mm / sec. When the fixing property of the toner was examined, the fixing property was good.

[Example 2]
Boron-containing resin-type toner particles 2: 25 parts by mass, diol-containing resin-type toner particles 2: 25 parts by mass, hydrophobic silica (manufactured by Cabot, TS720, particle size 12 nm): 1 part by mass is added and mixed in a sample mill Thus, externally added toner 2 was obtained.
Then, using a ferrite carrier having an average particle diameter of 50 μm coated with 1% of polymethyl methacrylate (manufactured by Soken Chemical Co., Ltd.), the externally added toner 2 is weighed so that the toner concentration becomes 6%, and both are mixed with a ball mill. Developer 2 was prepared by stirring and mixing for 5 minutes.
Using the developer 2 thus obtained, in a modified machine of DocuCenterColor f450 manufactured by Fuji Xerox Co., Ltd., a two-roll type fixing machine was modified so that the maximum fixing pressure was 10 MPa, and P1 paper was used as transfer paper. When the toner was used and the process speed was adjusted to 180 mm / sec and the toner fixability was examined, the pressure fixability was good (in-machine temperature 30 ° C.).

[Example 3]
Diol-containing resin-type toner particles 2: 50 parts by mass, boric acid particles (particle size 0.5 μm): 2 parts by mass, hydrophobic silica (manufactured by Cabot, TS720, particle size 12 nm) 1 part by mass was added, and the sample mill And externally added toner 3 was obtained.
Then, using a ferrite carrier having an average particle diameter of 50 μm coated with 1% of polymethyl methacrylate (manufactured by Soken Chemical Co., Ltd.), the externally added toner 3 is weighed so that the toner concentration becomes 6%, and both are added by a ball mill. Developer 3 was prepared by stirring and mixing for a minute.
Using the developer 3 thus obtained, in a modified DocuCenterColor f450 manufactured by Fuji Xerox Co., Ltd., a two-roll type fixing machine was modified so that the maximum fixing pressure was 10 MPa, and P1 paper was used as transfer paper. When the toner was used and the process speed was adjusted to 180 mm / sec and the toner fixability was examined, the pressure fixability was good (in-machine temperature 30 ° C.).

[Example 4]
Boron-containing capsule toner particles 1: 25 parts by mass, diol-containing capsule toner particles: 25 parts by mass were mixed to prepare developer 4.
When the developer 4 was used and a copying test of this toner was performed using a modified copying machine for FX2700 capsule toner manufactured by Fuji Xerox Co., Ltd., the pressure fixing property was good (internal temperature 30 ° C.).

[Example 5]
Diol-containing resin type toner particles 2: 50 parts by mass, tristearyl borate particles (particle size 0.5 μm): 6 parts by mass, hydrophobic silica (manufactured by Cabot, TS720, particle size 12 nm) 1 part by mass, External toner 5 was obtained by mixing with a sample mill.
Then, using a ferrite carrier having an average particle diameter of 50 μm coated with 1% of polymethyl methacrylate (manufactured by Soken Chemical Co., Ltd.), the externally added toner 5 is weighed so that the toner concentration becomes 6%, and both are added by a ball mill. Developer 5 was prepared by stirring and mixing for 5 minutes.
Using the developer 5 thus obtained, in a modified machine of DocuCenterColor f450 manufactured by Fuji Xerox Co., Ltd., a two-roll type fixing machine was modified so that the maximum fixing pressure was 10 MPa, and P1 paper was used as transfer paper. When the toner was used and the process speed was adjusted to 180 mm / sec and the toner fixability was examined, the pressure fixability was good (in-machine temperature 30 ° C.).

[Example 6]
Boron-containing resin-type toner particles 3: 25 parts by mass, diol-containing resin-type toner particles 1: 25 parts by mass, hydrophobic silica (manufactured by Cabot, TS720, particle size 12 nm): 1 part by mass is added and mixed in a sample mill Thus, externally added toner 7 was obtained.
Then, using a ferrite carrier having an average particle diameter of 50 μm coated with 1% of polymethyl methacrylate (manufactured by Soken Chemical Co., Ltd.), the externally added toner 1 is weighed so that the toner concentration becomes 6%, and both are added by a ball mill. Developer 6 was prepared by stirring and mixing for 5 minutes.
Using the developer 6 thus obtained, using a modified DocuCenterColor f450 manufactured by Fuji Xerox Co., Ltd., using P1 paper as the transfer paper, adjusting the fixing device temperature to 120 ° C., and the process speed to 180 mm / sec. When the fixing property of the toner was examined, the fixing property was good.

[Example 7]
Boron-containing resin-type toner particles 1: 25 parts by mass, diol-containing resin-type toner particles 3: 25 parts by mass, hydrophobic silica (manufactured by Cabot, TS720, particle size: 12 nm): 1 part by mass is added and mixed in a sample mill Thus, externally added toner 8 was obtained.
Then, using a ferrite carrier having an average particle diameter of 50 μm coated with 1% of polymethyl methacrylate (manufactured by Soken Chemical Co., Ltd.), the externally added toner 1 is weighed so that the toner concentration becomes 6%, and both are added by a ball mill. Developer 7 was prepared by stirring and mixing for 5 minutes.
Using the developer 7 thus obtained, using a modified DocuCenterColor f450 manufactured by Fuji Xerox Co., Ltd., using P1 paper as the transfer paper, adjusting the fixing device temperature to 120 ° C., and adjusting the process speed to 180 mm / sec. When the fixing property of the toner was examined, the fixing property was good.

[Comparative Example 1]
Diol-containing resin-type toner particles 1: 50 parts by mass, hydrophobic silica (manufactured by Cabot, TS720, particle size: 12 nm): 1 part by mass was added and mixed in a sample mill to obtain comparative external additive toner 1.
Then, using a ferrite carrier having an average particle diameter of 50 μm coated with 1% of polymethyl methacrylate (manufactured by Soken Chemical Co., Ltd.), the comparative externally added toner 1 is weighed so that the toner concentration becomes 6%, and both are ball milled. Comparative developer 1 was prepared by stirring and mixing for 5 minutes.
Using the resulting comparative developer 1, using a modified DocuCenterColor f450 manufactured by Fuji Xerox Co., Ltd., using P1 paper as the transfer paper, adjusting the fixing device temperature to 120 ° C, and the process speed to 180 mm / sec. When the toner fixing property was examined, the fixing property was good.

[Comparative Example 2]
Boron-containing toner particles 1: 50 parts by mass, hydrophobic silica (manufactured by Cabot, TS720, particle size: 12 nm): 1 part by mass was added and mixed in a sample mill to obtain comparative externally added toner 2.
Then, using a ferrite carrier having an average particle diameter of 50 μm coated with 1% of polymethyl methacrylate (manufactured by Soken Chemical Co., Ltd.), the comparative externally added toner 1 is weighed so that the toner concentration becomes 6%, and both are ball milled. Comparative developer 2 was prepared by stirring and mixing for 5 minutes.
Using the obtained comparative developer 2, using a modified DocuCenterColor f450 manufactured by Fuji Xerox Co., Ltd., using P1 paper as the transfer paper, adjusting the fixing device temperature to 120 ° C, and the process speed to 180 mm / sec. When the toner fixing property was examined, the fixing property was good.

[Comparative Example 3]
Diol-containing resin-type toner particles 2: 50 parts by mass and 1 part by mass of hydrophobic silica (manufactured by Cabot, TS720, particle size 12 nm) were added and mixed in a sample mill to obtain comparative external additive toner 3.
Then, using a ferrite carrier having an average particle diameter of 50 μm coated with 1% of polymethyl methacrylate (manufactured by Soken Chemical Co., Ltd.), the comparative externally added toner 3 is weighed so that the toner concentration becomes 6%. Comparative developer 3 was prepared by stirring and mixing for 5 minutes.
Using the comparative developer 3 thus obtained, in the modified machine of DocuCenterColor f450 manufactured by Fuji Xerox Co., Ltd., a two-roll type fixing machine was modified so that the maximum fixing pressure was 10 MPa, and P1 paper was used as transfer paper. And the process speed was adjusted to 180 mm / sec and the toner fixability was examined. The pressure fixability was good (in-machine temperature 30 ° C.).

[Comparative Example 4]
50 parts by mass of boron-containing toner particles 2 and 1 part by mass of hydrophobic silica (manufactured by Cabot, TS720, particle size 12 nm) were added and mixed in a sample mill to obtain comparative externally added toner 4.
Then, using a ferrite carrier having an average particle diameter of 50 μm coated with 1% polymethyl methacrylate (manufactured by Soken Chemical Co., Ltd.), the comparative external additive toner 4 is weighed so that the toner concentration becomes 6%, and both are ball milled. Comparative developer 4 was prepared by stirring and mixing for 5 minutes.
Using the comparative developer 4 thus obtained, in the modified machine of DocuCenterColor f450 manufactured by Fuji Xerox Co., Ltd., a two-roll type fixing machine was modified so that the maximum fixing pressure was 10 MPa, and P1 paper was used as transfer paper. And the process speed was adjusted to 180 mm / sec and the toner fixability was examined. The pressure fixability was good (in-machine temperature 30 ° C.).

[Evaluation]
The following evaluation was performed on the fixed image obtained in each example.

-Thermal storage evaluation-
100 sheets of paper on which a fixed image obtained in each example was formed were stacked and left in a chamber at 65 ° C. for 12 hours, and the following determination was made based on the adhesion behavior between the sheets. The results are shown in Table 1.
○ +: There was no adhesion between the sheets.
○: Although it was slightly crisp, it did not affect the image.
○-... Although it was crisp, it did not affect the image.
Δ: Slightly adhered partially and part of the image was missing.
X: Adhesion between sheets occurred, and image loss occurred.

-Fixed image scratch strength-
A pencil scratch test based on JIS K5400 was performed on the image portion after the 10 MPa fixing, and the following determination was made based on the pencil hardness. The results are shown in Table 1.
○: Pencil hardness H or higher and no problem at all.
(Triangle | delta): It is less than pencil hardness H and HB or more, and has a problem in actual use.
X: Pencil hardness was less than HB and practically problematic.

From the above results, it can be seen that in this embodiment, the fixed image scratch strength is better than in the comparative example.
In addition, it can be seen that the heat storage property of the fixed image is better in this embodiment than in the comparative example.

1Y, 1M, 1C, 1K, 107 photoconductor (image carrier)
2Y, 2M, 2C, 2K, 108 Charging roller 3Y, 3M, 3C, 3K Laser beam 3, 110 Exposure device 4Y, 4M, 4C, 4K, 111 Developing device (developing means)
5Y, 5M, 5C, 5K Primary transfer rollers 6Y, 6M, 6C, 6K, 113 Photoconductor cleaning device (cleaning means)
8Y, 8M, 8C, 8K Developer cartridge 10Y, 10M, 10C, 10K Unit 20 Intermediate transfer belt 22 Drive roller 24 Support roller 26 Secondary transfer roller (transfer means)
28, 115 Fixing device (fixing means)
30 Intermediate transfer member cleaning device 112 Transfer device 116 Mounting rail 117 Opening 118 for static elimination exposure Opening 200 for exposure Process cartridge,
P, 300 Recording paper (transfer object)

Claims (11)

Boric acid, boronic acid, borinic acid, and ester compounds thereof, and at least one boron compound selected from polymers having at least one of boronic acid groups, borinic acid groups, and ester groups thereof;
A diol compound having a diol structure;
A toner for developing an electrostatic charge image containing the toner separately.   The electrostatic charge image developing toner according to claim 1, comprising: a first toner containing the boron compound; and a second toner containing the diol compound. Toner particles containing one of the boron compound and the diol compound;
An external additive containing the other of the boron compound and the diol compound;
The toner for developing an electrostatic charge image according to claim 1. The electrostatic image developing toner according to claim 1, wherein the boron compound is at least one selected from polymers represented by the following general formula (1).

(In general formula (1), A represents a repeating unit in which a monomer having at least one of a boronic acid group, a borinic acid group, and an ester group thereof is polymerized.
B represents a repeating unit in which a monomer copolymerizable with the repeating unit represented by A is polymerized.
m and n each independently represent mol% of each repeating unit, m is 1 mol% or more and 100 mol% or less, and n is 0 mol% or more and 99 mol% or less. )   An electrostatic charge image developer comprising at least the electrostatic charge image developing toner according to claim 1. Containing the electrostatic image developing toner according to claim 1;
A toner cartridge to be attached to and detached from the image forming apparatus. A developing means for accommodating the electrostatic charge image developer according to claim 5 and developing the electrostatic charge image formed on the image carrier as a toner image by the electrostatic charge image developer,
A process cartridge attached to and detached from the image forming apparatus. An image carrier,
Charging means for charging the image carrier;
An electrostatic charge image forming means for forming an electrostatic charge image on the surface of the charged image carrier;
Developing means for containing the electrostatic charge image developer according to claim 5 and developing the electrostatic charge image formed on the image carrier as a toner image by the electrostatic charge image developer;
Transfer means for transferring a toner image formed on the image carrier onto a transfer target;
Fixing means for fixing the toner image transferred onto the transfer medium;
Image forming apparatus comprising   The image forming apparatus according to claim 8, wherein the fixing unit is a fixing unit that applies the pressure at a temperature of 40 ° C. or less to fix the toner image. A charging step for charging the image carrier;
An electrostatic charge image forming step of forming an electrostatic charge image on the surface of the charged image carrier;
A developing step of containing the electrostatic charge image developer according to claim 5 and developing the electrostatic charge image formed on the image carrier as a toner image by the electrostatic charge image developer;
A transfer step of transferring a toner image formed on the image carrier onto a transfer target;
A fixing step of fixing the toner image transferred onto the transfer medium;
An image forming method comprising: The image forming method according to claim 10, wherein the fixing step is a fixing step of fixing the toner image by applying a pressure at a temperature of 40 ° C. or less.
apparatus.

Images