JP6018684B2 - Toner for electrostatic image development - Google Patents

Description

  The present invention relates to an electrostatic image developing toner and a method for producing the same.

  In the field of electrophotography, with development of an electrophotographic system, development of toner for electrophotography corresponding to high image quality and high speed is demanded. As a method for obtaining a toner having a narrow particle size distribution and a small particle size corresponding to high image quality, an aggregation coalescence method (emulsification) in which fine resin particles are aggregated and fused in an aqueous medium to obtain a toner. A toner is manufactured by an aggregation method or an aggregation fusion method. In particular, a toner having a core-shell structure has been proposed in order to improve thermal characteristics such as low-temperature fixability and heat-resistant storage stability.

For example, in Patent Document 1, an amorphous polyester obtained by polycondensation of an alcohol component containing 80 mol% or more of a crystalline polyester and a propylene oxide adduct of bisphenol A and a carboxylic acid component is melt-mixed to obtain an aqueous medium. Contains amorphous polyester obtained by agglomerating resin particles and agglomerating the resulting resin particles, and polycondensing an alcohol component containing 80 mol% or more of bisphenol A ethylene oxide adduct and a carboxylic acid component. By adding resin particles to obtain core-shell particles, the particle size distribution is sharp by maintaining the specific temperature and obtaining coalesced core-shell particles, and both low-temperature fixability and storage stability are compatible. In addition, it is disclosed that an electrophotographic toner having improved toner scattering can be obtained.
Patent Document 2 discloses an electrophotographic toner containing core-shell particles, in which the core of the core-shell particles has a segment made of a polyester resin and a segment made of an addition polymer containing styrene as a structural unit. Toner containing core-shell particles, comprising an amorphous resin obtained by polycondensation of an alcohol component containing an aliphatic diol having 2 to 6 carbon atoms and a carboxylic acid component. However, it is disclosed that the toner for electrophotography is excellent in low-temperature fixability and hot offset resistance.

JP 2012-118236 A JP 2014-13384 A

However, in the methods disclosed in each of the above-mentioned patent documents, it cannot be said that both low-temperature fixability and heat-resistant storage stability are sufficient, and further improvement has been desired in terms of improvement in chargeability.
An object of the present invention is to provide a toner for developing an electrostatic image having both excellent low-temperature fixability and heat-resistant storage stability and excellent chargeability, and a method for producing the same.

  In the toner for developing an electrostatic charge image having a core-shell structure, the inventors have obtained low-temperature fixability and heat resistance when the core part and the resin constituting the shell part satisfy a composition containing a specific amount of a specific monomer component. It has been found that the toner is an electrostatic charge image developing toner having both storability and excellent chargeability.

That is, the present invention provides the following [1] and [2].
[1] An electrostatic charge image developing toner having a core-shell structure, comprising a binder resin containing a composite resin (A) and a crystalline polyester (B) and a wax in a core portion, and a polyester resin (C) Polyester resin obtained by polycondensing an alcohol component containing 80 mol% or more of a propylene oxide adduct of bisphenol A and a polyvalent carboxylic acid component, the binder resin containing Is a composite resin containing a segment (a1) comprising a vinyl resin segment (a2) containing a structural unit derived from a styrene compound, and the crystalline polyester (B) is an α having 8 to 16 carbon atoms. , Ω-aliphatic diol containing 80 mol% or more of an alcohol component and C8-C16 aliphatic saturated dicarboxylic acid containing 80 mol% or more A crystalline polyester obtained by polycondensation of a polyvalent carboxylic acid component, wherein the polyester resin (C) contains 80 mol% or more of an ethylene oxide adduct of bisphenol A and a polyvalent carboxylic acid component; A toner for developing an electrostatic image, which is a polyester resin obtained by polycondensation.
[2] The method for producing a toner for developing an electrostatic charge image according to the above [1], comprising the following steps (1) to (3).
Step (1): A step of obtaining aggregated particles (1) by aggregating resin particles (X) containing composite resin (A), resin particles (Z) containing crystalline polyester (B), and wax particles. Step (2): Aggregating particles (1) are aggregated with resin particles (Y) containing polyester resin (C) to obtain aggregated particles (2) Step (3): Aggregating particles (2) are melted Process of obtaining core-shell particles by attaching

  According to the present invention, it is possible to provide a toner for developing an electrostatic image having both excellent low-temperature fixability and heat-resistant storage stability and excellent chargeability, and a method for producing the same.

[Toner for electrostatic image development]
The electrostatic image developing toner of the present invention is an electrostatic image developing toner having a core-shell structure, and contains a binder resin containing a composite resin (A) and a crystalline polyester (B) and a wax in a core portion. And the binder resin containing the polyester resin (C) is contained in the shell portion, and the composite resin (A) contains an alcohol component containing 80 mol% or more of a propylene oxide adduct of bisphenol A and a polyvalent carboxylic acid component. A composite resin containing a segment (a1) comprising a polyester resin obtained by polycondensation and a vinyl resin segment (a2) containing a structural unit derived from a styrene compound, and the crystalline polyester (B) An alcohol component containing 80 mol% or more of an α, ω-aliphatic diol having 8 to 16 carbon atoms and an aliphatic saturated dicarbo having 8 to 16 carbon atoms Alcohol which is a crystalline polyester obtained by polycondensation with a polyvalent carboxylic acid component containing 80 mol% or more of acid, and in which polyester resin (C) contains 80 mol% or more of ethylene oxide adduct of bisphenol A An electrostatic charge image developing toner, which is a polyester resin obtained by polycondensation of a component and a polyvalent carboxylic acid component.

The reason for the electrostatic charge image developing toner of the present invention (hereinafter also simply referred to as “toner”) having both excellent low-temperature fixability and heat-resistant storage stability and excellent chargeability is not clear, but is as follows. Can be considered.
The core portion of the toner of the present invention includes a segment (a1) (hereinafter also referred to as “polyester segment (a1)”) made of a polyester resin having a structural unit derived from a propylene oxide adduct of bisphenol A as a main unit. Crystal obtained by polycondensing a composite resin (A) containing a vinyl resin segment (a2) containing a structural unit derived from a styrene compound, an alcohol component having a specific carbon number, and a polyvalent carboxylic acid component In addition, the shell portion of the toner of the present invention contains a polyester resin (C) whose main component is a structural unit derived from an ethylene oxide adduct of bisphenol A.
The crystalline polyester (B) in the core is highly compatible with the polyester segment (a1) contained in the composite resin (A) in the core, but is not highly compatible with the polyester resin (C) in the shell. . Moreover, the compatibility of the polyester segment (a1) contained in the composite resin (A) in the core and the polyester resin (C) in the shell is not high. Therefore, in the heating and fusing process at the time of toner production, compatibilization between the polyester in the core and the shell is suppressed, and the core-shell structure of the toner is maintained. This is considered to improve the performance.
In the toner of the present invention, the wax is included in the core containing the composite resin (A) and the crystalline polyester (B). Wax is familiar with a resin mixture obtained by mixing these composite resins, and the toner of the present invention has a shell portion in which the compatibility with the core portion is suppressed as described above, so that the wax is exposed to the toner surface. And desorption are reduced, and the chargeability is considered to be good.

<Core part>
The core portion in the toner of the present invention contains a composite resin (A), a crystalline polyester (B), and a wax from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.

(Composite resin (A))
The composite resin (A) comprises a segment (a1) made of a polyester resin obtained by polycondensation of an alcohol component containing 80 mol% or more of a propylene oxide adduct of bisphenol A and a polyvalent carboxylic acid component, and a styrene compound And a vinyl resin segment (a2) containing a structural unit derived therefrom.

The composite resin (A) is preferably an amorphous resin.
In the present invention, the amorphous resin is a ratio of a softening point and a maximum endothermic peak temperature (softening point (° C.) / Maximum endothermic peak temperature (° C.)) in the measurement method described in Examples described later. The defined crystallinity index is greater than 1.4 or less than 0.6.
The crystallinity index of the composite resin (A) is preferably 1.5 or more, more preferably 1.6 or more, and still more preferably 1. from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. It is 7 or more, and is preferably 4.0 or less, more preferably 3.0 or less, and further preferably 2.5 or less.
The crystallinity index can be appropriately adjusted according to the production conditions such as the type and ratio of the raw material monomers, the reaction temperature, the reaction time, and the cooling rate.

[Polyester segment (a1)]
The polyester segment (a1) is an alcohol component containing 80 mol% or more of a propylene oxide adduct of bisphenol A (hereinafter referred to as “alcohol component (A -Al) ”and a polyvalent carboxylic acid component (hereinafter also referred to as“ polyvalent carboxylic acid component (A-ac) ”). That is, the polyester segment (a1) is a segment made of a polyester resin that is a polycondensate of an alcohol component and a polycarboxylic acid component containing 80 mol% or more of a propylene oxide adduct of bisphenol A.

≪Alcohol component (A-al) ≫
The alcohol component (A-al) contains 80 mol% or more of a propylene oxide adduct of bisphenol A from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.
In the alcohol component (A-al), the content of the propylene oxide adduct of bisphenol A is 80 mol% or more, preferably 90%, from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. It is more than mol%, more preferably more than 95 mol%, still more preferably more than 98 mol%, and still more preferably 100 mol%.

  The average number of moles of propylene oxide added to the propylene oxide adduct of bisphenol A is preferably 1 or more, more preferably 1.2 or more, further from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. It is preferably 1.5 or more, and preferably 16 or less, more preferably 12 or less, still more preferably 8 or less, and still more preferably 4 or less.

  The alcohol component (A-al) may contain alcohol other than the propylene oxide adduct of bisphenol A. Other alcohol components that can be contained in the alcohol component (A-al) include aliphatic diols, aromatic diols, alicyclic diols, trivalent or higher polyhydric alcohols, or alkylene oxides having 2 to 4 carbon atoms thereof. (Average addition mole number 1-16) Adducts etc. are mentioned.

Specific examples of other alcohols that the alcohol component (A-al) may contain include ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, neopentyl glycol, 1,4-butenediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 1,9- Nonanediol, 1,10-decanediol, aliphatic diols such as 1,12-dodecanediol, aromatic diols such as bisphenol A or their ethylene oxide (average addition mole number of 1 to 16) adducts, hydrogenated bisphenol Alicyclic diols such as A or alkylene oxides having 2 to 4 carbon atoms (average addition) 2 or more and 12 or less) adducts, trihydric or higher polyhydric alcohols such as glycerin, pentaerythritol, trimethylolpropane and sorbitol, or alkylene oxides thereof having 2 to 4 carbon atoms (average added mole number of 1 to 16) ) Additives and the like.
Among these, an ethylene oxide adduct of bisphenol A is preferable.
These alcohol components (A-al) can be used alone or in combination of two or more.

≪Polyvalent carboxylic acid component (A-ac) ≫
Examples of the polyvalent carboxylic acid component (A-ac) include dicarboxylic acids, trivalent or higher polyvalent carboxylic acids, anhydrides thereof, and alkyl esters having 1 to 3 carbon atoms. Among these, dicarboxylic acids are preferable, and it is more preferable to use dicarboxylic acids and trivalent or higher polyvalent carboxylic acids in combination.
Examples of the dicarboxylic acid include aromatic dicarboxylic acids, aliphatic dicarboxylic acids, and alicyclic dicarboxylic acids. Aromatic dicarboxylic acids and aliphatic dicarboxylic acids are preferable, and aromatic dicarboxylic acids are more preferable.
The polyvalent carboxylic acid component (A-ac) includes not only a free acid but also an anhydride that decomposes to generate an acid during the reaction, and an alkyl ester having 1 to 3 carbon atoms of each carboxylic acid.
Examples of the aromatic dicarboxylic acid include phthalic acid, isophthalic acid, terephthalic acid and the like. From the viewpoint of improving the low-temperature fixability, heat-resistant storage property, and charging property of the toner, isophthalic acid and terephthalic acid are preferable, and terephthalic acid is preferable. More preferred.
The aliphatic dicarboxylic acid preferably has 2 to 30 carbon atoms, more preferably 3 to 20 carbon atoms, from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.
Examples of the aliphatic carboxylic acid having 2 to 30 carbon atoms include oxalic acid, malonic acid, maleic acid, fumaric acid, citraconic acid, itaconic acid, glutaconic acid, succinic acid, adipic acid, sebacic acid, 1,12-dodecanedioic acid. Examples thereof include acid, azelaic acid, succinic acid substituted with an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, and fumaric acid and sebacine from the viewpoint of improving the heat-resistant storage stability of the toner. Acid is preferred. Specific examples of the succinic acid substituted with an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms include dodecyl succinic acid, dodecenyl succinic acid, octenyl succinic acid, and the like.
Among these, terephthalic acid, fumaric acid, and sebacic acid are preferable, and it is more preferable to use these in combination.
As the trivalent or higher polyvalent carboxylic acid, trimellitic acid and its acid anhydride are preferable, and trimellitic acid anhydride is more preferable from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. Further, the content in the case of containing a trivalent or higher polyvalent carboxylic acid is preferably in the polyvalent carboxylic acid component (A-ac) from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. Is 3 mol% or more, more preferably 5 mol% or more, and preferably 30 mol% or less, more preferably 15 mol% or less.
These polyvalent carboxylic acid components (A-ac) can be used alone or in combination of two or more.

  The equivalent ratio (COOH group / OH group) of the polyvalent carboxylic acid component (A-ac) to the alcohol component (A-al) is preferable from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. Is 0.7 or more, more preferably 0.8 or more, still more preferably 0.9 or more, and preferably 1.3 or less, more preferably 1.2 or less, still more preferably 1.1 or less. .

  The content of the polyester segment (a1) in the composite resin (A) is preferably 40% by mass or more, more preferably 45% by mass or more, and further preferably 55% by mass or more, from the viewpoint of improving the low-temperature fixability of the toner. From the viewpoint of improving the heat resistant storage stability and chargeability of the toner, it is preferably 90% by mass or less, more preferably 85% by mass or less, and still more preferably 75% by mass or less.

[Vinyl resin segment (a2)]
The vinyl resin segment (a2) contains a structural unit derived from a styrene compound from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.

≪Styrene compound≫
Examples of the styrenic compound include substituted or unsubstituted styrene. Examples of the substituent include an alkyl group having 1 to 5 carbon atoms, a halogen atom, an alkoxy group having 1 to 5 carbon atoms, a sulfonic acid group, or a salt thereof.
Styrene compounds such as styrene, methyl styrene, α-methyl styrene, β-methyl styrene, t-butyl styrene, chlorostyrene, chloromethyl styrene, methoxy styrene, styrene sulfonic acid or salts thereof are preferable, and styrene Is more preferable, and styrene is still more preferable.
The content of the styrene compound in the raw vinyl monomer that is the component derived from the vinyl resin segment (a2) is preferably 50% by mass or more from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. More preferably 65% by mass or more, still more preferably 75% by mass or more, and preferably 100% by mass or less, more preferably 95% by mass or less, still more preferably 90% by mass or less, still more preferably 85% by mass. % Or less.

≪Vinyl monomers other than styrene compounds≫
Examples of vinyl monomers other than styrene compounds include (meth) acrylic acid esters such as alkyl (meth) acrylate (having 1 to 24 carbon atoms), benzyl (meth) acrylate, and dimethylaminoethyl (meth) acrylate; ethylene Olefins such as vinyl chloride, vinyl esters such as vinyl acetate and vinyl propionate, vinyl ethers such as vinyl methyl ether, vinylidene halides such as vinylidene chloride, N-vinylpyrrolidone, etc. 1 type, or 2 or more types, such as an N-vinyl compound, are mentioned. Among these, (meth) acrylic acid ester is preferable and alkyl (meth) acrylate (having 1 to 22 carbon atoms) is more preferable from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.
The number of carbon atoms of the alkyl group in the alkyl (meth) acrylate is preferably 1 or more, more preferably 6 or more, and further preferably 10 or more, from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. From the viewpoint of availability of the monomer, it is preferably 24 or less, more preferably 22 or less, and still more preferably 20 or less.
Specifically, methyl (meth) acrylate, ethyl (meth) acrylate, (iso) propyl (meth) acrylate, (meth) acrylic acid (iso or tertiary) butyl, (meth) acrylic acid (iso) Amyl, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (meth) acrylic acid (iso) octyl, (meth) acrylic acid (iso) decyl, (meth) acrylic acid (iso) dodecyl, (meta ) (Iso) palmityl acrylate, (meth) acrylic acid (iso) stearyl, (meth) acrylic acid (iso) behenyl, etc. are mentioned, 2-ethylhexyl acrylate or stearyl methacrylate is preferred, stearyl methacrylate is more preferred .
In addition, “(iso or tertiary)” and “(iso)” mean both cases in which these groups are present and cases in which these groups are not present. “(Meth) acrylic acid” indicates acrylic acid or methacrylic acid.
Among these, styrene alone or a combination of styrene and a (meth) acrylic acid ester is preferable from the viewpoint of improving the availability of monomers and low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. The combined use with a meth) acrylate ester is more preferable, and the combined use of styrene and an alkyl (meth) acrylate having an alkyl group having 10 to 20 carbon atoms is more preferable.

  The content of the (meth) acrylic acid ester in the raw material vinyl monomer that is the component derived from the vinyl resin segment (a2) is preferably 5 from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. It is at least 10 mass%, more preferably at least 10 mass%, even more preferably at least 15 mass%, and preferably at most 50 mass%, more preferably at most 35 mass%, still more preferably at most 25 mass%.

  The total amount of the styrene compound and the (meth) acrylic acid ester in the raw vinyl monomer that is the component derived from the vinyl resin segment (a2) is a viewpoint that improves the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. Therefore, it is preferably 80% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more, and still more preferably 100% by mass.

≪Amotropic monomer≫
When an amphoteric monomer is used as a raw material monomer for the composite resin (A), the amphoteric monomer reacts with both the polyester segment (a1) and the vinyl resin segment (a2), thereby producing the composite resin (A). Can be manufactured. That is, the composite resin (A) used in the present invention preferably includes a structural unit derived from an amphoteric monomer, and the structural unit derived from the amphoteric monomer includes the vinyl-based resin segment (a2) and the above-described structural unit. It is preferable to become a bonding point with the polyester segment (a1).
Examples of the both reactive monomers include vinyl monomers having one or more functional groups selected from a hydroxyl group, a carboxy group, an epoxy group, a primary amino group, and a secondary amino group in the molecule. Among these, from the viewpoint of reactivity, a vinyl monomer having a hydroxyl group and / or a carboxy group is preferable, and a vinyl monomer having a carboxy group is more preferable. Specific examples of the vinyl monomer having a carboxy group include acrylic acid, methacrylic acid, fumaric acid, maleic acid and the like. Among them, from the viewpoint of both the polycondensation reaction and the addition polymerization reaction, 1 or more types chosen from acrylic acid and methacrylic acid are preferable, and acrylic acid is more preferable.

  The amount of both reactive monomers used is the raw material of the polyester segment (a1) from the viewpoint of dispersibility of the addition polymer containing a styrene compound as a structural unit in the polyester resin and reaction control of the addition polymerization reaction and the polycondensation reaction. Preferably, it is 1 mol part or more, more preferably 5 mol part or more, still more preferably 10 mol part or more, still more preferably 13 mol part or more, with respect to 100 mol parts of the total amount of a certain alcohol component (A-al). And preferably it is 30 mol parts or less, More preferably, it is 25 mol parts or less, More preferably, it is 20 mol parts or less.

  The content of the vinyl resin segment (a2) in the composite resin (A) is preferably 10% by mass or more, more preferably 15% by mass or more, from the viewpoint of improving the heat resistant storage stability and chargeability of the toner. Preferably, it is 25% by mass or more, and from the viewpoint of improving the low-temperature fixability of the toner, it is preferably 60% by mass or less, more preferably 55% by mass or less, and further preferably 45% by mass or less.

  The total amount of the polyester segment (a1) and the vinyl resin segment (a2) in the composite resin (A) is preferably 80% by mass from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. More preferably, it is 90% by mass or more, more preferably 95% by mass or more, and still more preferably 100% by mass.

[Softening point of composite resin (A)]
The softening point of the composite resin (A) is preferably 70 ° C. or higher, more preferably 80 ° C. or higher, and still more preferably 90 ° C. or higher, from the viewpoint of improving the heat resistant storage stability and chargeability of the toner. From the viewpoint of improving the low-temperature fixability and chargeability, the temperature is preferably 140 ° C. or lower, more preferably 120 ° C. or lower, and still more preferably 110 ° C. or lower.

[Glass transition temperature of composite resin (A)]
From the same viewpoint, the glass transition temperature of the composite resin (A) is preferably 25 ° C. or higher, more preferably 30 ° C. or higher, still more preferably 33 ° C. or higher, and preferably less than 55 ° C., more preferably 50 ° C or lower, more preferably 45 ° C or lower.

[Acid value of composite resin (A)]
The acid value of the composite resin (A) is preferably 5 mgKOH / from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner and improving the dispersion stability of the resin particles (X) described later. g or more, more preferably 10 mgKOH / g or more, still more preferably 15 mgKOH / g or more, and preferably 40 mgKOH / g or less, more preferably 35 mgKOH / g or less, still more preferably 30 mgKOH / g or less.

The softening point, glass transition temperature, and acid value of the composite resin (A) are determined by the methods described in the examples.
Moreover, the softening point, glass transition temperature, and acid value of the composite resin (A) can be appropriately adjusted according to the production conditions such as the type and ratio of the raw material monomers, the reaction temperature, the reaction time, and the cooling rate.
In addition, when using 2 or more types of composite resin (A), the softening point, glass transition temperature, and acid value are as described in an Example as a mixture of 2 or more types of composite resins (A), respectively. The value obtained by the method.

[Production method of composite resin (A)]
The composite resin (A) is preferably produced by any of the following methods (i) to (iii). In addition, it is preferable that both reactive monomers are supplied to a reaction system with the raw material monomer of a vinyl-type resin segment (a2) from a reactive viewpoint. Further, from the viewpoint of reactivity, a catalyst such as an esterification catalyst or an esterification cocatalyst may be used, and a radical polymerization initiator and a radical polymerization inhibitor may be further used.

(I) After the step of polycondensation reaction with an alcohol component and a polyvalent carboxylic acid component (hereinafter also referred to as “step (A)”), the raw material monomer of the vinyl resin segment (a2) and, if necessary, both reactivity A method of performing a step of addition polymerization reaction with a monomer (hereinafter also referred to as “step (B)”).
In the step (A), a part of the polyvalent carboxylic acid component is subjected to a polycondensation reaction, and then the step (B) is carried out, and then the reaction temperature is increased again, and the remainder of the polyvalent carboxylic acid component is removed from the polymerization system. A method in which the polycondensation reaction in step (A) and, if necessary, the reaction with both reactive monomers are further advanced is more preferable.

(Ii) A method in which the step (A) of the polycondensation reaction with the raw material monomer of the polyester segment (a1) is performed after the step (B) of the addition polymerization reaction with the raw material monomer and the both reactive monomers of the vinyl resin segment (a2). .
The alcohol component and the polycarboxylic acid component are allowed to exist in the reaction system during the addition polymerization reaction, and an esterification catalyst and, if necessary, an esterification co-catalyst are added at a temperature suitable for the polycondensation reaction. The polycondensation reaction can be started, or the polycondensation reaction can be started by adding it to the reaction system later under temperature conditions suitable for the polycondensation reaction. In the former case, the molecular weight and molecular weight distribution can be adjusted by adding an esterification catalyst and, if necessary, an esterification co-catalyst at a temperature suitable for the polycondensation reaction.

(Iii) In parallel with the step (A) of the polycondensation reaction with the alcohol component and the polyvalent carboxylic acid component and the step (B) of the addition polymerization reaction with the raw material monomers and the both reactive monomers of the vinyl resin segment (a2). How to do.
In this method, step (A) and step (B) are performed under reaction temperature conditions suitable for addition polymerization reaction, the reaction temperature is increased, and under temperature conditions suitable for polycondensation reaction, if necessary, It is preferable to add a trivalent or higher raw material monomer of the polyester segment (a1) to the polymerization system as a crosslinking agent, and further perform the polycondensation reaction in the step (A). At that time, under a temperature condition suitable for the polycondensation reaction, a radical polymerization inhibitor can be added to advance only the polycondensation reaction. Both reactive monomers are involved in the polycondensation reaction as well as the addition polymerization reaction.
Among these, the method (i) is preferable because the degree of freedom in the reaction temperature of the polycondensation reaction is high.
The methods (i) to (iii) are preferably performed in the same container.

  The temperature of the addition polymerization reaction varies depending on the type of the radical polymerization initiator used, but is preferably 110 ° C. or higher, more preferably 130 ° C. or higher, and still more preferably 150 ° C. from the viewpoint of the productivity of the composite resin (A). The temperature is preferably 220 ° C. or lower, more preferably 200 ° C. or lower, and still more preferably 180 ° C. or lower.

The temperature of the polycondensation reaction is preferably 120 ° C. or higher, more preferably 140 ° C. or higher, further preferably 180 ° C. or higher, even more preferably 200 ° C. or higher, from the viewpoint of the productivity of the composite resin (A). The temperature is preferably 260 ° C. or lower, more preferably 250 ° C. or lower, still more preferably 245 ° C. or lower, and still more preferably 240 ° C. or lower.
Moreover, it is preferable to accelerate the reaction by reducing the pressure of the reaction system in the latter half of the polymerization.

Examples of the esterification catalyst suitably used for the polycondensation reaction include tin compounds such as dibutyltin oxide and di (2-ethylhexanoic acid) tin (II), and titanium compounds such as titanium diisopropylate bistriethanolaminate. The esterification catalyst can be used.
Although there is no restriction | limiting in the usage-amount of an esterification catalyst, Preferably it is 0.01 mass part or more with respect to 100 mass parts of total amounts of an alcohol component (A-al) and a polyhydric carboxylic acid component (A-ac). Preferably it is 0.1 mass part or more, More preferably, it is 0.3 mass part or more, Preferably it is 5 mass parts or less, More preferably, it is 2 mass parts or less, More preferably, it is 1 mass part or less.

Examples of esterification promoters include pyrogallol compounds such as pyrogallol, gallic acid, and gallic acid esters; benzophenone derivatives such as 2,3,4-trihydroxybenzophenone and 2,2 ′, 3,4-tetrahydroxybenzophenone; epigallocatechin And catechin derivatives such as epigallocatechin gallate, and gallic acid is preferred from the viewpoint of reactivity.
The amount of esterification cocatalyst used in the polycondensation reaction is preferably 0 with respect to a total amount of 100 parts by mass of the alcohol component (A-al) and the polyvalent carboxylic acid component (A-ac) from the viewpoint of reactivity. 0.001 part by weight or more, more preferably 0.01 part by weight or more, further preferably 0.03 part by weight or more, and preferably 0.5 part by weight or less, more preferably 0.2 part by weight or less, further Preferably it is 0.1 mass part or less.
Known polymerization initiators for addition polymerization reaction include peroxides such as dibutyl peroxide, persulfates such as sodium persulfate, and azo compounds such as 2,2′-azobis (2,4-dimethylvaleronitrile). These radical polymerization initiators can be used.
Although there is no restriction | limiting in the usage-amount of a radical polymerization initiator, Preferably it is 1 mass part or more with respect to 100 mass parts of raw material monomers of a vinyl-type resin segment (a2), More preferably, it is 3 mass parts or more, More preferably, it is 5 masses. Part or more, and preferably 20 parts by mass or less, more preferably 15 parts by mass or less.

In the production of the composite resin (A), a radical polymerization inhibitor can be used as necessary. Examples of the radical polymerization inhibitor include tert-butylcatechol.
The amount of the radical polymerization inhibitor used is preferably 0.001 part by mass or more, more preferably 0 with respect to 100 parts by mass of the total amount of the alcohol component (A-al) and the polyvalent carboxylic acid component (A-ac). 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, and preferably 0.5 parts by mass or less, more preferably 0.3 parts by mass or less, still more preferably 0.15 parts by mass or less. .

(Crystalline polyester (B))
The core portion in the toner of the present invention contains the crystalline polyester (B) from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.
In the present invention, the crystalline polyester is one having the above-mentioned crystallinity index of 0.6 or more and 1.4 or less.
The crystallinity index of the crystalline polyester (B) is preferably 0.8 or more, more preferably 0.9 or more, from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. Preferably it is 1.3 or less, More preferably, it is 1.2 or less.
The crystallinity index can be appropriately adjusted according to the production conditions such as the type and ratio of the raw material monomers, the reaction temperature, the reaction time, and the cooling rate.

  The crystalline polyester (B) comprises an alcohol component (hereinafter also referred to as “alcohol component (B-al)”) containing an α, ω-aliphatic diol having 8 to 16 carbon atoms and 8 carbon atoms. It is obtained by polycondensation with a polyvalent carboxylic acid component (hereinafter also referred to as “alcohol component (B-ac)”) containing at least 80 mol% of an aliphatic saturated dicarboxylic acid of 16 or less. That is, the crystalline polyester (B) comprises 80 mol% of an alcohol component containing 80 mol% or more of an α, ω-aliphatic diol having 8 to 16 carbon atoms and an aliphatic saturated dicarboxylic acid having 8 to 16 carbon atoms. It is a polycondensate with the polycarboxylic acid component contained above.

[Alcohol component (B-al)]
The alcohol component (B-al) contains 80 mol% or more of an α, ω-aliphatic diol having 8 to 16 carbon atoms from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.
From the same viewpoint, the α, ω-aliphatic diol having 8 to 16 carbon atoms is preferably 9 or more, more preferably 10 or more, and preferably 14 or less, more preferably 12 or less, More preferably, it is 11 or less.
Examples of the α, ω-aliphatic diol having 8 to 16 carbon atoms include 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, and 1,12-dodecane. Examples include diol, 1,13-tridecanediol, 1,14-tetradecanediol, and the like. Among these, 1,9-nonanediol, 1,10-decanediol, and 1,12-dodecanediol are preferable from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner, and 1,10- Decanediol and 1,12-dodecanediol are more preferable, and 1,10-decanediol is still more preferable.

  The content of the α, ω-aliphatic diol having 8 to 16 carbon atoms is 80 mol% in the alcohol component (B-al) from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability and chargeability of the toner. Or more, preferably 85 mol% or more, more preferably 90 mol% or more, still more preferably 95 mol% or more, and still more preferably 100 mol%.

The alcohol component (B-al) may contain an alcohol component other than an α, ω-aliphatic diol having 8 to 16 carbon atoms.
Examples of the alcohol component other than the α, ω-aliphatic diol having 8 to 16 carbon atoms include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,5-pentanediol, and 1,6-hexane. Aliphatic diols having 2 to 7 carbon atoms such as diol and neopentyl glycol; aromatic diols such as alkylene oxide adducts of bisphenol A; trivalent or higher alcohols such as glycerin, pentaerythritol, and trimethylolpropane. .
These alcohol components (B-al) can be used alone or in combination of two or more.

[Polyvalent carboxylic acid component (B-ac)]
The polyvalent carboxylic acid component (B-ac) contains an aliphatic saturated dicarboxylic acid having 8 to 16 carbon atoms in an amount of 80 mol% or more from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. .
From the same viewpoint, the aliphatic saturated dicarboxylic acid having 8 to 16 carbon atoms is preferably 9 or more, more preferably 10 or more, and preferably 14 or less, more preferably 12 or less, still more preferably. Is 11 or less.
The aliphatic saturated dicarboxylic acid having 8 to 16 carbon atoms is preferably sebacic acid or dodecanedioic acid.
The polyvalent carboxylic acid component (B-ac) includes not only a free acid but also an anhydride that decomposes to generate an acid during the reaction, and an alkyl ester having 1 to 3 carbon atoms of each carboxylic acid.

The content of the aliphatic saturated dicarboxylic acid having 8 to 16 carbon atoms is 80 mol in the polyvalent carboxylic acid component (B-ac) from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability and chargeability of the toner. % Or more, preferably 85 mol% or more, more preferably 90 mol% or more, still more preferably 95 mol% or more, still more preferably 100 mol%.
These polyvalent carboxylic acid components (B-ac) can be used alone or in combination of two or more.

  The equivalent ratio (COOH group / OH group) of the polyvalent carboxylic acid component (B-ac) to the alcohol component (B-al) is preferable from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. Is 0.7 or more, more preferably 0.8 or more, still more preferably 0.9 or more, and preferably 1.3 or less, more preferably 1.2 or less, still more preferably 1.1 or less. .

[Softening point of crystalline polyester (B)]
The softening point of the crystalline polyester (B) is preferably 60 ° C. or higher, more preferably 75 ° C. or higher, and still more preferably 85 ° C. or higher, from the viewpoint of improving the heat resistant storage stability and chargeability of the toner. From the viewpoint of improving the low-temperature fixability of the toner, it is preferably 150 ° C. or lower, more preferably 120 ° C. or lower, still more preferably 100 ° C. or lower, and still more preferably 95 ° C. or lower.

[Melting point of crystalline polyester (B)]
From the same viewpoint, the melting point of the crystalline polyester (B) is preferably 50 ° C. or higher, more preferably 65 ° C. or higher, still more preferably 75 ° C. or higher, and preferably 100 ° C. or lower, more preferably 90 ° C. Below, it is 80 degrees C or less more preferably.

[Acid Value of Crystalline Polyester (B)]
The acid value of the crystalline polyester (B) is preferably 5 mgKOH from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner and improving the dispersion stability of the resin particles (Z) described later. / G or more, more preferably 10 mgKOH / g or more, still more preferably 15 mgKOH / g or more, and preferably 35 mgKOH / g or less, more preferably 30 mgKOH / g or less, still more preferably 25 mgKOH / g or less.

The softening point, melting point, and acid value of the crystalline polyester (B) are determined by the method described in the examples.
Further, the softening point, melting point, and acid value of the crystalline polyester (B) can be appropriately adjusted according to the production conditions such as the type and ratio of the raw material monomers, the reaction temperature, the reaction time, and the cooling rate.
In addition, when using 2 or more types of crystalline polyester (B) mixed, the softening point, a glass transition temperature, and an acid value are used as an Example as a mixture of 2 or more types of crystalline polyester (B), respectively. It is the value obtained by the described method.

[Method for producing crystalline polyester (B)]
Crystalline polyester (B) is, for example, an alcohol component (B-al) and a polyvalent carboxylic acid component (B-ac) in an inert gas atmosphere, if necessary, esterification catalyst, esterification promoter, It can be produced by polycondensation using a radical polymerization inhibitor or the like.
Examples of the esterification catalyst, esterification co-catalyst, and radical polymerization inhibitor include the same ones used for the synthesis of the polyester segment (a1).

  Although there is no restriction | limiting in the usage-amount of an esterification catalyst, Preferably it is 0.01 mass part or more with respect to 100 mass parts of total amounts of an alcohol component (B-al) and a polyhydric carboxylic acid component (B-ac). Preferably it is 0.1 mass part or more, More preferably, it is 0.3 mass part or more, Preferably it is 5 mass parts or less, More preferably, it is 2 mass parts or less, More preferably, it is 1 mass part or less.

  The temperature of the polycondensation reaction is preferably 120 ° C. or higher, more preferably 160 ° C. or higher, still more preferably 180 ° C. or higher, and preferably 250 ° C. or lower, more preferably 230 ° C. or lower, more preferably 220 ° C. or lower. It is.

  In addition to the composite resin (A) and the crystalline polyester (B), the core portion is a known resin used for toner, for example, a polyester other than the crystalline polyester (B), a styrene-acrylic copolymer, an epoxy, a polycarbonate, Polyurethane or the like can be used.

The total content of the composite resin (A) and the crystalline polyester (B) in the total binder resin contained in the core portion is preferably from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. It is 60 mass% or more, More preferably, it is 80 mass% or more, More preferably, it is 90 mass% or more, More preferably, it is 95 mass% or more, More preferably, it is 100 mass%.
The mass ratio [(A) / (B)] of the composite resin (A) and the crystalline polyester (B) is preferably 70 / from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability and chargeability of the toner. 30 or more, more preferably 75/25 or more, still more preferably 85/15 or more, still more preferably 88/12 or more, and preferably 98/2 or less, more preferably 95/5 or less, still more preferably 92/8 or less.

(wax)
The core portion in the toner of the present invention contains a wax from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.
As the wax, ester wax, hydrocarbon wax, silicone wax, fatty acid amide and the like can be used. Among these, hydrocarbon wax is preferable from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.
Examples of hydrocarbon waxes include low molecular weight polyolefins such as polyethylene, polypropylene, and polybutene; minerals such as ozokerite, ceresin, paraffin wax, microcrystalline wax, and Fischer-Tropsch wax, and petroleum waxes. Among these, paraffin wax is preferable from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.
Examples of ester waxes include esters composed of long-chain alcohols such as stearyl stearate and behenyl behenate and fatty acids; esters composed of pentaerythritol and fatty acids such as behenic acid; carnauba wax, rice wax, montan wax, beeswax, etc. From the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner, carnauba wax is preferable.

  The melting point of the wax is preferably 60 ° C. or higher, more preferably 65 ° C. or higher, and still more preferably 70 ° C. or higher, from the viewpoint of improving the heat-resistant storage stability and chargeability of the toner. From the viewpoint of improving the temperature, it is preferably 100 ° C. or lower, more preferably 90 ° C. or lower, and still more preferably 80 ° C. or lower.

The content of the wax is preferably 2 masses with respect to 100 mass parts of the total amount of the binder resin contained in the core portion from the viewpoint of improving the releasability, low-temperature fixability, heat-resistant storage stability and chargeability of the toner. Part or more, more preferably 5 parts by weight or more, and still more preferably 7 parts by weight or more, and from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner, preferably 30 parts by weight or less, more Preferably it is 25 mass parts or less, More preferably, it is 20 mass parts or less, More preferably, it is 15 mass parts or less.
The wax content is preferably 1 mass relative to 100 mass parts of the total amount of the binder resin in the toner from the viewpoint of improving the releasability, low-temperature fixability, heat-resistant storage stability and chargeability of the toner. Part or more, more preferably 2 parts by weight or more, and still more preferably 5 parts by weight or more, and from the viewpoint of improving the low-temperature fixability, heat resistant storage stability, and chargeability of the toner, preferably 30 parts by weight or less, more Preferably it is 25 mass parts or less, More preferably, it is 18 mass parts or less, More preferably, it is 12 mass parts or less.

(Optional component)
The core portion may contain a colorant and a charge control agent as necessary. Moreover, additives such as reinforcing fillers such as fibrous substances, antioxidants, and anti-aging agents may be included as long as the effects of the present invention are not impaired.

[Colorant]
Examples of the colorant used in the present invention include pigments and dyes, and pigments are preferable from the viewpoint of improving the image density of printed matter.
Examples of the pigment include a cyan pigment, a yellow pigment, a magenta pigment, and a black pigment.
The cyan pigment is preferably a phthalocyanine pigment, and more preferably copper phthalocyanine. The yellow pigment is preferably a monoazo pigment, isoindoline pigment, or benzimidazolone pigment, and the magenta pigment is preferably a soluble azo pigment such as a quinacridone pigment or a BONA lake pigment, or an insoluble azo pigment such as a naphthol AS pigment. The black pigment is preferably carbon black.
Examples of the dye include an acridine dye, an azo dye, a benzoquinone dye, an azine dye, an anthraquinone dye, an indigo dye, a phthalocyanine dye, and an aniline black dye. A coloring agent can be used individually or in combination of 2 or more types.
The content of the colorant is preferably 2 parts by mass or more, more preferably 5 parts by mass or more, further with respect to 100 parts by mass of the total amount of the binder resin contained in the core part, from the viewpoint of improving the image density of the printed matter. The amount is preferably 7 parts by mass or more, and preferably 30 parts by mass or less, more preferably 20 parts by mass or less, and still more preferably 15 parts by mass or less.

<Shell part>
The shell portion in the toner of the present invention contains a polyester resin (C) from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.

(Polyester resin (C))
The polyester resin (C) is an alcohol component containing 80 mol% or more of an ethylene oxide adduct of bisphenol A (hereinafter referred to as “alcohol component (C) from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner”. -Al) ") and a polyvalent carboxylic acid component (hereinafter also referred to as" polyvalent carboxylic acid component (C-ac) "). That is, the polyester resin (C) is a polycondensate of an alcohol component containing 80 mol% or more of an ethylene oxide adduct of bisphenol A and a polyvalent carboxylic acid component.
The polyester resin (C) is preferably an amorphous polyester, and the above-mentioned crystallinity index is less than 0.6 or from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. It is preferably more than 4 and 4 or less, more preferably less than 0.6 or 1.5 or more and 4 or less, more preferably less than 0.6 or 1.5 or more and 3 or less, still more preferably less than 0.6 or 1.5 or more and 2 or less.
The crystallinity index can be adjusted by the type and ratio of raw material monomers, production conditions (for example, reaction temperature, reaction time, cooling rate, etc.) and the like.

[Alcohol component (C-al)]
The alcohol component (C-al) contains 80 mol% or more of an ethylene oxide adduct of bisphenol A from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.
The content of the ethylene oxide adduct of bisphenol A in the alcohol component (C-al) is preferably 90 mol% or more, more preferably from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. It is 95 mol% or more, more preferably 98 mol% or more, and still more preferably 100 mol%.

  The average addition mole number of ethylene oxide of the ethylene oxide adduct of bisphenol A is preferably 1 or more, more preferably 1.2 or more, and more preferably 1.2 or more, from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. It is preferably 1.5 or more, and preferably 16 or less, more preferably 12 or less, still more preferably 8 or less, and still more preferably 4 or less.

The alcohol component (C-al) may contain other alcohol components other than the ethylene oxide adduct of bisphenol A. Other alcohols that can be contained in the alcohol component (C-al) include aliphatic diols, aromatic diols, alicyclic diols, trivalent or higher polyhydric alcohols, or alkylene oxides having 2 to 4 carbon atoms thereof ( Average addition mole number 1-16) and adducts.
Specific examples of other alcohols that the alcohol component (C-al) may contain include ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, neopentyl glycol, 1,4-butenediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 1,9- Nonanediol, 1,10-decanediol, aliphatic diols such as 1,12-dodecanediol, aromatic diols such as bisphenol A or their propylene oxide (average addition mole number 1 to 16) addition product, cyclohexanediol, Cycloaliphatic diol such as cyclohexanedimethanol, hydrogenated bisphenol A or the like Or an alkylene oxide (average addition mole number 2 to 12) adduct, trivalent or higher polyhydric alcohol such as glycerin, pentaerythritol, trimethylolpropane, sorbitol, or their carbon number 2 or more 4 The following alkylene oxide (average addition mole number 1-16) addition products etc. are mentioned.
These alcohol components (C-al) can be used alone or in combination of two or more.

[Polyvalent carboxylic acid component (C-ac)]
Examples of the polycarboxylic acid component (C-ac) include dicarboxylic acids, trivalent or higher polyvalent carboxylic acids, anhydrides thereof, and alkyl esters having 1 to 3 carbon atoms. An acid is preferable, and it is more preferable to use a dicarboxylic acid and a trivalent or higher polyvalent carboxylic acid in combination.
Examples of the dicarboxylic acid include aromatic dicarboxylic acids, aliphatic dicarboxylic acids, and alicyclic dicarboxylic acids. Aromatic dicarboxylic acids and aliphatic dicarboxylic acids are preferable, and aromatic dicarboxylic acids are more preferable.
The polyvalent carboxylic acid component (C-ac) includes not only a free acid but also an anhydride that decomposes to generate an acid during the reaction, and an alkyl ester having 1 to 3 carbon atoms of each carboxylic acid.
Examples of the aromatic dicarboxylic acid include phthalic acid, isophthalic acid, terephthalic acid, and the like. From the viewpoint of improving the heat resistant storage stability of the toner, isophthalic acid and terephthalic acid are preferable, and terephthalic acid is more preferable.
The aliphatic dicarboxylic acid preferably has 2 to 30 carbon atoms, more preferably 3 to 20 carbon atoms, from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.
Examples of the aliphatic carboxylic acid having 2 to 30 carbon atoms include oxalic acid, malonic acid, maleic acid, fumaric acid, citraconic acid, itaconic acid, glutaconic acid, succinic acid, adipic acid, sebacic acid, 1,12-dodecanedioic acid. Examples include acid, azelaic acid, succinic acid substituted with an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, and improve the low-temperature fixability, heat-resistant storage property, and chargeability of the toner. From the point of view, succinic acid and fumaric acid substituted with an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms is preferable.
The carbon number of the alkyl group or alkenyl group of the succinic acid substituted with an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms depends on the low-temperature fixing property, heat-resistant storage property, and charging property of the toner. From the viewpoint of improving the ratio, it is preferably 6 or more, more preferably 8 or more, and preferably 18 or less, more preferably 16 or less, and still more preferably 14 or less.
Specific examples of succinic acid substituted with an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms include dodecyl succinic acid, dodecenyl succinic acid, octenyl succinic acid, and the like. Dodecenyl succinic acid and its anhydride 1 or more types chosen from a thing are more preferable.
In the polycarboxylic acid component (C-ac), succinic acid substituted with an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, preferably an alkyl group having 6 to 18 carbon atoms or The content of succinic acid substituted with an alkenyl group having 6 to 18 carbon atoms is preferably 2 mol% or more, more preferably 3 mol% or more, still more preferably 4 mol% or more, and preferably 20 It is not more than mol%, more preferably not more than 15 mol%, still more preferably not more than 10 mol%, still more preferably not more than 7 mol%.
As the trivalent or higher polyvalent carboxylic acid, trimellitic acid and its acid anhydride are preferable, and trimellitic acid anhydride is more preferable from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. In addition, the content in the case of containing a trivalent or higher polyvalent carboxylic acid is preferably in the polyvalent carboxylic acid component (C-ac) from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. Is 3 mol% or more, more preferably 5 mol% or more, and preferably 30 mol% or less, more preferably 15 mol% or less.
These polyvalent carboxylic acid components (C-ac) can be used alone or in combination of two or more.

  The equivalent ratio (COOH group / OH group) of the polyvalent carboxylic acid component (C-ac) to the alcohol component (C-al) is preferable from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. Is 0.7 or more, more preferably 0.8 or more, and preferably 1.2 or less, more preferably 1.1 or less, and still more preferably 1.05 or less.

[Softening point of polyester resin (C)]
The softening point of the polyester resin (C) is preferably 90 ° C. or higher, more preferably 100 ° C. or higher, and still more preferably 110 ° C. or higher, from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. And, it is preferably 160 ° C. or lower, more preferably 140 ° C. or lower, and further preferably 130 ° C. or lower.

[Glass transition temperature of polyester resin (C)]
The glass transition temperature of the polyester resin (C) is preferably 40 ° C. or higher, more preferably 50 ° C. or higher, and still more preferably 60 ° C. or higher, from the viewpoint of improving the low temperature fixability, heat resistant storage stability, and chargeability of the toner. Yes, and preferably 90 ° C. or lower, more preferably 80 ° C. or lower, and still more preferably 70 ° C. or lower.

[Acid value of polyester resin (C)]
The acid value of the polyester resin (C) is preferably 5 mgKOH / percent from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability and chargeability of the toner and improving the dispersion stability of the resin particles (Y) described later. g or more, more preferably 10 mgKOH / g or more, still more preferably 15 mgKOH / g or more, and preferably 35 mgKOH / g or less, more preferably 30 mgKOH / g or less, still more preferably 25 mgKOH / g or less.

The softening point, glass transition temperature, and acid value of the polyester resin (C) are determined by the methods described in the examples.
Moreover, the softening point, glass transition temperature, and acid value of the polyester resin (C) can be appropriately adjusted according to the production conditions such as the type and ratio of the raw material monomers, the reaction temperature, the reaction time, and the cooling rate.
In addition, when using 2 or more types of polyester resin (C) in mixture, the softening point, glass transition temperature, and acid value are as a mixture of 2 or more types of polyester resins (C), respectively, as described in an Example. The value obtained by the method.

[Production method of polyester resin (C)]
The polyester resin (C) is, for example, an esterification catalyst or an esterification co-catalyst as necessary when the alcohol component (C-al) and the polyvalent carboxylic acid component (C-ac) are in an inert gas atmosphere. It can be produced by polycondensation using a radical polymerization inhibitor or the like.
Examples of the esterification catalyst, esterification co-catalyst, and radical polymerization inhibitor include the same ones used for the synthesis of the polyester segment (a1).

  Although there is no restriction | limiting in the usage-amount of an esterification catalyst, Preferably it is 0.01 mass part or more with respect to 100 mass parts of total amounts of an alcohol component (C-al) and a polyhydric carboxylic acid component (C-ac). Preferably it is 0.1 mass part or more, More preferably, it is 0.3 mass part or more, Preferably it is 5 mass parts or less, More preferably, it is 2 mass parts or less, More preferably, it is 1 mass part or less.

The amount of the esterification cocatalyst used in the polycondensation reaction is preferably 0 with respect to the total amount of 100 parts by mass of the alcohol component (C-al) and the polyvalent carboxylic acid component (C-ac) from the viewpoint of reactivity. 0.001 part by weight or more, more preferably 0.01 part by weight or more, further preferably 0.03 part by weight or more, and preferably 0.5 part by weight or less, more preferably 0.2 part by weight or less, further Preferably it is 0.1 mass part or less.
The amount of the radical polymerization inhibitor used is preferably 0.001 part by mass or more, more preferably 0 with respect to 100 parts by mass of the total amount of the alcohol component (C-al) and the polyvalent carboxylic acid component (C-ac). 0.01 parts by mass or more, and preferably 0.5 parts by mass or less, more preferably 0.3 parts by mass or less, and still more preferably 0.15 parts by mass or less.

The temperature of the polycondensation reaction is preferably 120 ° C. or higher, more preferably 140 ° C. or higher, still more preferably 180 ° C. or higher, still more preferably 200 ° C. or higher, from the viewpoint of productivity of the polyester resin (C). The temperature is preferably 260 ° C. or lower, more preferably 250 ° C. or lower, still more preferably 245 ° C. or lower, and still more preferably 240 ° C. or lower.
Moreover, it is preferable to accelerate the reaction by reducing the pressure of the reaction system in the latter half of the polymerization.

In addition to the polyester resin (C), a known resin used for the toner, for example, a polyester other than the polyester resin (C), a styrene-acrylic copolymer, an epoxy, a polycarbonate, a polyurethane, or the like can be used for the shell portion. .
The content of the polyester resin (C) in the total binder resin contained in the shell portion is preferably 80% by mass or more, more preferably from the viewpoint of improving the low temperature fixability, heat resistant storage stability, and chargeability of the toner. It is 90 mass% or more, More preferably, it is 95 mass% or more, More preferably, it is 100 mass%.

  The shell portion may contain the colorant and the charge control agent as necessary. Moreover, additives such as reinforcing fillers such as fibrous substances, antioxidants, and anti-aging agents may be included as long as the effects of the present invention are not impaired.

  The mass ratio (core / shell) of the resin in the core and the resin in the shell constituting the toner of the present invention is preferably 1.5 or more, more preferably 2.0 or more, and further preferably 2.5 or more. Yes, and preferably 9.0 or less, more preferably 7.0 or less, still more preferably 5.0 or less, and still more preferably 4.0 or less.

[Method for producing toner for developing electrostatic image]
The method for producing an electrostatic charge image developing toner of the present invention includes the following steps (1) to (3).
Step (1): A step of obtaining aggregated particles (1) by aggregating resin particles (X) containing composite resin (A), resin particles (Z) containing crystalline polyester (B), and wax particles. Step (2): Aggregating particles (1) are aggregated with resin particles (Y) containing polyester resin (C) to obtain aggregated particles (2) Step (3): Aggregating particles (2) are melted Process of obtaining core-shell particles by attaching

<Step (1)>
Step (1) is a step of obtaining aggregated particles (1) by aggregating resin particles (X) containing composite resin (A), resin particles (Z) containing crystalline polyester (B), and wax particles. It is.
The step of aggregating the resin particles (X), the resin particles (Z), and the wax particles to obtain the aggregated particles (1) may be referred to as “aggregation step (1)”.

(Resin particles (X))
The resin particle (X) is a resin particle constituting the core portion of the toner obtained by the production method of the present invention, and contains the composite resin (A).

The resin particles (X) are produced by a method in which the resin component containing the composite resin (A) and, if necessary, the above optional components are dispersed in an aqueous medium to obtain an aqueous dispersion of the resin particles (X). It is preferable to do.
As a method of obtaining an aqueous dispersion of resin particles (X), a method of adding a composite resin (A) or the like to an aqueous medium and performing a dispersion treatment with a disperser or the like, or gradually adding an aqueous medium to the composite resin (A) or the like Examples of the method include phase-inversion emulsification and the like. From the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the obtained toner, the method by phase inversion emulsification is preferable.

[Aqueous medium]
As the aqueous medium used for the production of the resin particles (X), those containing water as a main component are preferable. The content of water in the medium is preferably 80% by mass or more, more preferably 90% by mass or more, further preferably 95% by mass or more, still more preferably 98% by mass or more, and still more preferably 100% by mass. . As water, deionized water or distilled water is preferably used.
Components other than water that can form an aqueous medium together with water include alkyl alcohols having 1 to 5 carbon atoms; dialkyl ketones having 3 to 5 carbon atoms such as acetone and methyl ethyl ketone; dissolved in water such as cyclic ethers such as tetrahydrofuran An organic solvent is used. Among these, from the viewpoint of preventing the organic solvent from being mixed into the toner, an alkyl alcohol having 1 to 5 carbon atoms that does not dissolve the polyester is preferable, and methanol, ethanol, isopropanol, and butanol are more preferable.
Hereinafter, the method by phase inversion emulsification will be described.

[Phase inversion emulsification]
As the phase inversion emulsification method, a method in which an aqueous medium is added to a solution obtained by dissolving the composite resin (A) and other optional components in an organic solvent to perform phase inversion emulsification (hereinafter, “method (1) -1) "), and a resin mixture obtained by melting and mixing the composite resin (A) and other optional components described above, and an aqueous medium is added to carry out phase inversion emulsification (hereinafter referred to as" 1 "). "Method (1-2)"). From the viewpoint of obtaining an aqueous dispersion of homogeneous resin particles (X), the method (1-1) is preferable.

  In the method (1-1), first, the composite resin (A) and other optional components are dissolved in an organic solvent to obtain an organic solvent solution of a mixture containing the composite resin (A) and other optional components, Next, a phase inversion emulsification is performed by adding an aqueous medium to the obtained solution.

≪Organic solvent≫
As an organic solvent, from the viewpoint of dissolving the composite resin (A) and facilitating phase inversion to an aqueous medium, the solubility parameter (SP value: POLYMER HANDBOOK THIRD EDITION 1989 by John Wiley & Sons, Inc.) , preferably 15.0 MPa ^1/2 or more, more preferably 16.0MPa ^1/2, and even more preferably at 17.0MPa ^1/2 or more, and, preferably 26.0MPa ^1/2 or less, more preferably 24.0 MPa ^1/2 or less, more preferably 22.0 MPa ^1/2 or less.

Specific examples include the following organic solvents. The parentheses on the right side of the name of the next organic solvent are SP values, and the unit is MPa ^1/2 . That is, specific examples include alcohol solvents such as ethanol (26.0), isopropanol (23.5), and isobutanol (21.5); acetone (20.3), methyl ethyl ketone (19.0), methyl Ketone solvents such as isobutyl ketone (17.2) and diethyl ketone (18.0); ether solvents such as dibutyl ether (16.5), tetrahydrofuran (18.6) and dioxane (20.5); Examples thereof include acetate solvents such as ethyl acetate (18.6) and isopropyl acetate (17.4). Among these, from the viewpoint of easy removal from the mixed solution after addition of the aqueous medium, preferably one or more selected from ketone solvents and acetate solvents, more preferably from methyl ethyl ketone, ethyl acetate and isopropyl acetate. One or more selected, more preferably methyl ethyl ketone.

  The mass ratio between the organic solvent and the resin constituting the resin particle (X) (organic solvent / resin constituting the resin particle (X)) is a viewpoint that dissolves the resin and facilitates phase inversion to an aqueous medium, and the resin. From the viewpoint of improving the dispersion stability of the particles (X), it is preferably 0.1 or more, more preferably 0.2 or more, still more preferably 0.4 or more, and preferably 4 or less, more preferably 2 Hereinafter, it is more preferably 1 or less.

In the method (1-1), it is preferable to add a neutralizing agent to the solution. Examples of the neutralizing agent include basic substances. Examples of the basic substance include alkali metal hydroxides such as lithium hydroxide, sodium hydroxide and potassium hydroxide, nitrogen-containing substances such as ammonia, trimethylamine, ethylamine, diethylamine, triethylamine, diethanolamine, triethanolamine and tributylamine. A basic substance is mentioned, Among these, From the viewpoint of improving the dispersion stability and cohesiveness of the resin particles (X), an alkali metal hydroxide is preferable, and sodium hydroxide is more preferable.
The degree of neutralization (mol%) of the composite resin (A) with the neutralizing agent is preferably 10 mol% or more, more preferably 30 mol% or more, and preferably 150 mol% or less, more preferably 120 mol. % Or less, more preferably 100 mol% or less.
In addition, the neutralization degree (mol%) of resin can be calculated | required by a following formula.
Degree of neutralization = {[addition mass of neutralizer (g) / equivalent of neutralizer] / [[acid value of composite resin (A) (mgKOH / g) × mass of resin (g)] / (56 × 1000)]} × 100

The amount of the aqueous medium to be added is 100 parts by mass of the resin constituting the resin particle (X) from the viewpoint of improving the dispersion stability of the resin particle (X) and obtaining uniform agglomerated particles in the subsequent aggregation process. On the other hand, it is preferably 100 parts by mass or more, more preferably 150 parts by mass or more, further preferably 200 parts by mass or more, and preferably 900 parts by mass or less, more preferably 600 parts by mass or less, still more preferably 400 parts by mass. Or less.
Further, from the viewpoint of improving the dispersion stability of the resin particles (X), the mass ratio of the aqueous medium to the organic solvent (aqueous medium / organic solvent) is preferably 20/80 or more, more preferably 50/50 or more. More preferably, it is 80/20 or more, and preferably 97/3 or less, more preferably 93/7 or less, and still more preferably 90/10 or less.

The temperature at which the aqueous medium is added is preferably equal to or higher than the glass transition temperature of the composite resin (A) from the viewpoint of improving the dispersion stability of the resin particles (X). Specifically, the temperature at which the aqueous medium is added is preferably 40 ° C. or higher, more preferably 50 ° C. or higher, and further preferably 60 ° C. or higher, from the viewpoint of improving the dispersion stability of the resin particles (X). Yes, and preferably 85 ° C or lower, more preferably 80 ° C or lower, and still more preferably 75 ° C or lower.
From the viewpoint of obtaining resin particles (X) having a small particle size, the addition rate of the aqueous medium is preferably 0.1 with respect to 100 parts by mass of the resin constituting the resin particles (X) until the phase inversion is completed. Parts by weight / minute or more, more preferably 0.5 parts by weight / minute or more, further preferably 1 part by weight / minute or more, still more preferably 3 parts by weight / minute or more, and preferably 50 parts by weight / minute. In the following, it is more preferably 30 parts by mass or less, further preferably 20 parts by mass or less, and still more preferably 10 parts by mass or less. There is no restriction | limiting in the addition rate of the aqueous medium after phase inversion.

You may have the process of removing an organic solvent from the dispersion obtained by phase inversion emulsification as needed after phase inversion emulsification.
The method for removing the organic solvent is not particularly limited, and any method can be used. However, since it is dissolved in water, it is preferably distilled. Further, the organic solvent may not be completely removed and may remain in the aqueous dispersion. In this case, the residual amount of the organic solvent is preferably 1% by mass or less, more preferably 0.5% by mass or less, and still more preferably substantially 0% by mass in the aqueous dispersion.

  When removing the organic solvent by distillation, it is preferable to raise the temperature to a temperature equal to or higher than the boiling point of the organic solvent to be used while stirring. Further, from the viewpoint of maintaining the dispersion stability of the resin particles (X), it is more preferable to raise the temperature to a temperature equal to or higher than the boiling point of the organic solvent to be used under reduced pressure and to distill it off. Note that the temperature may be increased after the pressure is reduced, or the pressure may be decreased after the temperature is increased. From the viewpoint of maintaining the dispersion stability of the resin particles (X), it is preferable to distill off at a constant temperature and pressure.

[Solid concentration]
The solid content concentration of the obtained aqueous dispersion of resin particles (X) is preferably 5% from the viewpoint of improving the productivity of the toner and the dispersion stability of the aqueous dispersion of resin particles (X). % Or more, more preferably 10% by weight or more, still more preferably 15% by weight or more, and preferably 50% by weight or less, more preferably 40% by weight or less, still more preferably 30% by weight or less, and still more preferably. 25% by mass or less.
In addition, solid content is the total amount of non-volatile components, such as resin, a coloring agent, and surfactant.

[Volume Median Particle Size (D ₅₀ ) of Resin Particle (X)]
The volume median particle size (D ₅₀ ) of the resin particles (X) in the aqueous dispersion is preferably 0.05 μm or more, more preferably 0.10 μm or more, from the viewpoint of obtaining a toner capable of obtaining a high-quality image. More preferably, it is 0.12 μm or more, and preferably 0.80 μm or less, more preferably 0.40 μm or less, and still more preferably 0.20 μm or less. Here, the volume-median particle size is a particle size at which the cumulative volume frequency calculated by the volume fraction is 50% when calculated from the smaller particle size, and is obtained by the method described in the examples.

[CV value of resin particles (X)]
Further, the coefficient of variation (CV value) (%) of the particle size distribution of the resin particles (X) is preferably 5% or more, more preferably from the viewpoint of improving the productivity of the aqueous dispersion of the resin particles (X). From the viewpoint of obtaining a toner capable of obtaining a high-quality image, it is preferably 50% or less, more preferably 40% or less, and even more preferably 30% or less.
The CV value is a value represented by the following formula. The volume average particle diameter in the following formula is a particle diameter obtained by multiplying the particle diameter measured on a volume basis by the ratio of particles having the particle diameter value and dividing the value obtained by the number of particles. It is obtained by the method described in the examples.
CV value (%) = [standard deviation of particle size distribution (nm) / volume average particle size (nm)] × 100

(Resin particles (Z))
The resin particles (Z) are resin particles constituting the core portion of the toner obtained by the production method of the present invention, and contain the crystalline polyester (B).

The resin particle (Z) is obtained by dispersing the resin component containing the crystalline polyester (B) and, if necessary, the optional component in an aqueous medium to obtain an aqueous dispersion of the resin particle (Z). It is preferable to manufacture.
The method for obtaining the aqueous dispersion is the same as in the case of the resin particles (X), in which the crystalline polyester (B) or the like is added to an aqueous medium and dispersed using a disperser, or the crystalline polyester (B) is aqueous. Examples thereof include a method of gradually adding a medium to perform phase inversion emulsification, and the method by phase inversion emulsification is preferable from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the obtained toner.
As with the phase inversion emulsification method, as in the case of the resin particles (X), there is a method of phase inversion emulsification by adding an aqueous medium to a solution obtained by dissolving the resin and other optional components in an organic solvent. preferable. Preferred embodiments of the aqueous medium and organic solvent that can be used are also the same as the aqueous medium and organic solvent used in the method for producing the resin particles (X).

  The mass ratio of the organic solvent to the resin constituting the resin particles (Z) (organic solvent / resin constituting the resin particles (Z)) is a viewpoint that dissolves the resin and facilitates phase inversion to an aqueous medium, and the resin. From the viewpoint of improving the dispersion stability of the particles (Z), it is preferably 0.1 or more, more preferably 0.2 or more, still more preferably 0.4 or more, and preferably 4 or less, more preferably 2 Hereinafter, it is more preferably 1 or less.

Also in this production method, it is preferable to add a neutralizing agent to the solution. The preferable aspect of a neutralizing agent is the same as that of the neutralizing agent used for the manufacturing method of the said resin particle (X).
The degree of neutralization (mol%) of the crystalline polyester (B) by the neutralizing agent is preferably 10 mol% or more, more preferably 30 mol% or more, and preferably 150 mol% or less, more preferably 120 mol%. The mol% or less, more preferably 100 mol% or less.

The amount of the aqueous medium to be added is preferably 100 parts by mass or more, more preferably 150 parts by mass with respect to 100 parts by mass of the resin constituting the resin particles (Z) from the viewpoint of improving the dispersion stability of the resin particles (Z). It is at least 200 parts by mass, more preferably at least 200 parts by mass, and preferably at most 900 parts by mass, more preferably at most 600 parts by mass, and even more preferably at most 400 parts by mass.
Further, from the viewpoint of improving the dispersion stability of the resin particles (Z), the mass ratio of the aqueous medium to the organic solvent (aqueous medium / organic solvent) is preferably 20/80 or more, more preferably 50/50 or more. More preferably, it is 80/20 or more, and preferably 97/3 or less, more preferably 93/7 or less, and still more preferably 90/10 or less.

From the viewpoint of improving the dispersion stability of the resin particles (Z), the temperature at which the aqueous medium is added is preferably 30 ° C. or higher, more preferably 50 ° C. or higher, further preferably 60 ° C. or higher, and preferably Is 85 ° C. or lower, more preferably 80 ° C. or lower, and still more preferably 75 ° C. or lower.
From the viewpoint of obtaining resin particles (Z) having a small particle diameter, the addition rate of the aqueous medium is preferably 0.1 with respect to 100 parts by mass of the resin constituting the resin particles (Z) until the phase inversion is completed. Parts by weight / minute or more, more preferably 0.5 parts by weight / minute or more, further preferably 1 part by weight / minute or more, still more preferably 5 parts by weight / minute or more, and preferably 50 parts by weight / minute. In the following, it is more preferably 30 parts by mass or less, further preferably 20 parts by mass or less, and still more preferably 10 parts by mass or less. There is no restriction | limiting in the addition rate of the aqueous medium after phase inversion.

You may have the process of removing an organic solvent from the dispersion obtained by phase inversion emulsification as needed after phase inversion emulsification.
A preferred embodiment of the method for removing the organic solvent and the remaining amount of the organic solvent in the aqueous dispersion is the same as the method for producing the resin particles (X).

[Solid concentration]
The solid content concentration of the obtained aqueous dispersion of resin particles (Z) is preferably 5% from the viewpoint of improving the productivity of the toner and the dispersion stability of the aqueous dispersion of resin particles (Z). % Or more, more preferably 10% by weight or more, still more preferably 15% by weight or more, and preferably 50% by weight or less, more preferably 40% by weight or less, still more preferably 30% by weight or less, and still more preferably. 25% by mass or less.
In addition, solid content is the total amount of non-volatile components, such as resin, a coloring agent, and surfactant.

[Volume Median Particle Size (D ₅₀ ) of Resin Particles (Z)]
The volume median particle size (D ₅₀ ) of the resin particles (Z) in the aqueous dispersion is preferably 0.05 μm or more, more preferably 0.10 μm or more, from the viewpoint of obtaining a toner capable of obtaining a high-quality image. More preferably, it is 0.12 μm or more, and preferably 0.80 μm or less, more preferably 0.40 μm or less, and still more preferably 0.20 μm or less.

[CV value of resin particles (Z)]
Further, the coefficient of variation (CV value) (%) of the particle size distribution of the resin particles (Z) is preferably 5% or more, more preferably from the viewpoint of improving the productivity of the aqueous dispersion of the resin particles (Z). From the viewpoint of obtaining a toner capable of obtaining a high-quality image, it is preferably 50% or less, more preferably 40% or less, and even more preferably 30% or less.

(Wax particles)
The wax particles are preferably obtained as a dispersion of wax particles (hereinafter also referred to as “wax particle dispersion”) by dispersing wax in an aqueous medium.
The wax particle dispersion is preferably obtained by dispersing the wax and the aqueous medium using a disperser in the presence of a surfactant or the like at a temperature equal to or higher than the melting point of the wax. As the disperser to be used, a homogenizer, an ultrasonic disperser, a high-pressure disperser and the like are preferable from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner.
Examples of the ultrasonic disperser include an ultrasonic homogenizer. The commercially available products include “US-150T”, “US-300T”, “US-600T” (manufactured by Nippon Seiki Seisakusho Co., Ltd.), “SONIFIER (registered trademark) 4020-400”, and “SONIFIER (registered trademark) 4020. -800 "(manufactured by Branson).
As an apparatus marketed as a high-pressure disperser, a high-pressure wet atomization apparatus “Nanomizer (registered trademark) NM2-L200-D08” (manufactured by Yoshida Kikai Kogyo Co., Ltd.) can be mentioned.
In addition, before using the disperser, it is preferable to preliminarily disperse the wax, the surfactant, and the aqueous medium in advance using a mixer such as a homomixer or a ball mill.
A preferred embodiment of the aqueous medium used in the production is the same as the aqueous medium used when obtaining the aqueous dispersion of the resin particles (X).

[Surfactant]
The dispersion of the wax particles in the aqueous medium is preferably performed in the presence of a surfactant from the viewpoint of improving the dispersion stability of the wax particles and obtaining uniform aggregated particles in the subsequent aggregation step (1). .
Examples of the surfactant used for the production of the wax particles include nonionic surfactants, anionic surfactants, cationic surfactants, etc., and the viewpoint of improving the dispersion stability of the wax particles, From the viewpoint of improving the cohesiveness of the resin particles, an anionic surfactant is preferable. Specific examples of the anionic surfactant include sodium dodecylbenzenesulfonate, sodium dodecyl sulfate, sodium lauryl ether sulfate, dipotassium alkenyl succinate, and preferably dipotassium alkenyl succinate.

  The content of the surfactant in the wax particle dispersion is preferably from the viewpoint of improving the dispersion stability of the wax particles and from the viewpoint of improving the cohesiveness of the wax particles during the preparation of the toner and preventing the release. 1% by mass or more, more preferably 0.3% by mass or more, still more preferably 0.5% by mass or more, and preferably 5.0% by mass or less, more preferably 2.0% by mass or less.

[Solid concentration]
The solid content concentration of the wax particle dispersion is preferably 5% by mass or more, more preferably 10% by mass or more, from the viewpoint of improving the productivity of the toner and the dispersion stability of the wax particle dispersion. The amount is preferably 15% by mass or more, and preferably 50% by mass or less, more preferably 30% by mass or less, and further preferably 25% by mass or less.

[Volume Median Particle Size of Wax Particles (D ₅₀ )]
The volume median particle size (D ₅₀ ) of the wax particles is determined from the viewpoint of obtaining uniform aggregated particles in the subsequent aggregation step (1), and from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. The thickness is preferably 0.1 μm or more, more preferably 0.2 μm or more, still more preferably 0.3 μm or more, and preferably 1 μm or less, more preferably 0.8 μm or less, and even more preferably 0.6 μm or less.

[CV value of wax particles]
The CV value of the wax particles is preferably 10% or more, more preferably 25% or more from the viewpoint of improving the productivity of the toner, and the viewpoint of obtaining uniform aggregated particles in the subsequent aggregation step (1). From the viewpoint of improving the chargeability of the toner, it is preferably 50% or less, more preferably 45% or less, and still more preferably 42% or less.
The volume median particle size and CV value of the wax particles are specifically determined by the method described in the examples.

(Manufacture of agglomerated particles (1))
The agglomerated particles (1) may be any of an aqueous dispersion of resin particles (X), an aqueous dispersion of resin particles (Z), a wax particle dispersion, and, if necessary, an aggregating agent, a surfactant, and a colorant. It can be suitably produced by a method in which the components are aggregated in an aqueous medium to obtain aggregated particles.
In this step, first, an aqueous dispersion of the resin particles (X), an aqueous dispersion of the resin particles (Z), a wax particle dispersion, and a colorant, a surfactant, and the like that are added as necessary are an aqueous medium. It is preferable to mix in to obtain a mixed dispersion. In addition, when a coloring agent is not mixed with resin particle (X), it is preferable to mix a coloring agent in this mixed dispersion liquid.
Further, resin particles other than the resin particles (X) and the resin particles (Z) may be mixed in the mixed dispersion.
There is no restriction | limiting in order of mixing, You may add any in order and may add simultaneously.

(Coloring agent)
When the colorant is mixed in the present mixed dispersion, it is preferable to obtain a colorant particle dispersion (hereinafter also referred to as “colorant particle dispersion”) by dispersing the colorant in an aqueous medium.
The colorant particle dispersion is preferably obtained by dispersing the colorant and the aqueous medium using a disperser in the presence of a surfactant or the like. As the disperser to be used, a homogenizer, an ultrasonic disperser or the like is preferable.
A preferred embodiment of the aqueous medium used in the production is the same as the aqueous medium used when obtaining the aqueous dispersion of the resin particles (X).

[Surfactant]
The dispersion of the colorant particles in the aqueous medium is preferably performed in the presence of a surfactant from the viewpoint of improving the dispersion stability of the colorant particles.
Examples of the surfactant used for the production of the colorant particles include nonionic surfactants, anionic surfactants, and cationic surfactants. From the viewpoint of improving the cohesiveness between the agent particles, the resin particles (X), and the resin particles (Z), an anionic surfactant is preferable. Specific examples of the anionic surfactant include sodium dodecylbenzenesulfonate, sodium dodecylsulfate, sodium lauryl ether sulfate, dipotassium alkenyl succinate, and preferably sodium dodecylbenzenesulfonate.

  The content of the surfactant in the colorant particle dispersion is preferably from the viewpoint of improving the dispersion stability of the colorant particles and from the viewpoint of improving the cohesiveness of the colorant particles at the time of toner preparation and preventing release. Is 0.1% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, and preferably 5.0% by mass or less, more preferably 4.5% by mass or less. It is.

[Solid concentration]
The solid content concentration of the colorant particle dispersion is preferably 5% by mass or more, more preferably 10% by mass or more from the viewpoint of improving the productivity of the toner and the dispersion stability of the colorant particle dispersion. More preferably, it is 15% by mass or more, and preferably 50% by mass or less, more preferably 40% by mass or less, and still more preferably 30% by mass or less.

[Volume Median Particle Size of Colorant Particles (D ₅₀ )]
The volume median particle size (D ₅₀ ) of the colorant particles is preferably 50 nm or more, more preferably 80 nm or more, still more preferably 100 nm or more, from the viewpoint of obtaining a toner capable of obtaining a high-quality image. Is 500 nm or less, more preferably 300 nm or less, and still more preferably 150 nm or less.

The content of the resin particles in the mixed dispersion (the total content of the resin particles (X) and the resin particles (Z)) is from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the obtained toner. Preferably, it is 5% by mass or more, more preferably 10% by mass or more, further preferably 12% by mass or more, and preferably 40% by mass from the viewpoint of controlling aggregation and obtaining aggregated particles having a desired particle size. Hereinafter, it is more preferably 30% by mass or less, and further preferably 20% by mass or less.
The mass ratio [(X) / (Z)] of the resin particles (X) and the resin particles (Z) in the mixed dispersion is from the viewpoint of improving the low temperature fixability, heat resistant storage stability, and chargeability of the toner. Preferably it is 70/30 or more, more preferably 75/25 or more, still more preferably 85/15 or more, still more preferably 88/12 or more, and preferably 98/2 or less, more preferably 95/5 or less. More preferably, it is 92/8 or less.

  The content of the wax particles in the mixed dispersion is the resin particles (X) from the viewpoint of improving the releasability of the toner and improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the obtained toner. And preferably 2 parts by mass or more, more preferably 5 parts by mass or more, and still more preferably 7 parts by mass or more with respect to 100 parts by mass in total of the resin particles (Z). From the viewpoint of improving the chargeability and chargeability, it is preferably 30 parts by mass or less, more preferably 25 parts by mass or less, still more preferably 20 parts by mass or less, and still more preferably 15 parts by mass or less.

  In addition, the content of the wax particles in the mixed dispersion is determined from the viewpoint of improving the releasability of the toner and from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the obtained toner. It is preferably 1 part by mass or more, more preferably 2 parts by mass or more, and still more preferably 5 parts by mass or more, with respect to 100 parts by mass of the total amount of the binder resin. From the viewpoint of improving chargeability, it is preferably 30 parts by mass or less, more preferably 25 parts by mass or less, still more preferably 18 parts by mass or less, and still more preferably 12 parts by mass or less.

  The content in the case of mixing the colorant particles in the mixed dispersion is based on the total of 100 parts by mass of the resin particles (X) and the resin particles (Z) from the viewpoint of obtaining a toner capable of obtaining a high-quality image. , Preferably 2 parts by mass or more, more preferably 5 parts by mass or more, further preferably 7 parts by mass or more, and preferably 30 parts by mass or less, more preferably 20 parts by mass or less, still more preferably 15 parts by mass or less. It is.

  The mixing temperature is preferably 0 ° C. or higher, more preferably 10 ° C. or higher, still more preferably 20 ° C. or higher, and preferably 40 ° C. or lower, from the viewpoint of controlling aggregation and obtaining aggregated particles having a desired particle size. More preferably, it is 30 ° C. or lower.

  Next, the particles in the mixed dispersion are aggregated to obtain a dispersion of aggregated particles (1). From the viewpoint of efficiently performing the aggregation, it is preferable to add an aggregating agent.

(Flocculant)
The flocculant is preferably an electrolyte, and more preferably a salt, from the viewpoint of obtaining a toner having a desired particle diameter while preventing excessive aggregation.
Examples of the aggregating agent include a quaternary salt cationic surfactant, an organic aggregating agent such as polyethyleneimine; an inorganic aggregating agent such as an inorganic metal salt, an inorganic ammonium salt, and a bivalent or higher metal complex. From the viewpoint of improving cohesion and obtaining uniform aggregated particles, inorganic coagulants are preferred, inorganic metal salts and inorganic ammonium salts are more preferred, and inorganic ammonium salts are even more preferred.
The valence of the cation of the inorganic flocculant is preferably 5 or less, more preferably 2 or less, and even more preferably 1 from the viewpoint of obtaining a toner having a desired particle size while preventing excessive aggregation.

Examples of the monovalent cation of the inorganic flocculant include sodium ion, potassium ion, ammonium ion, and the like. From the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the obtained toner, ammonium ion is preferable. .
Examples of the inorganic metal salt include metal salts such as sodium sulfate, sodium nitrate, sodium chloride, calcium chloride, and calcium nitrate, and inorganic metal salt polymers such as polyaluminum chloride and polyaluminum hydroxide.
Examples of inorganic ammonium salts include ammonium sulfate, ammonium chloride, and ammonium nitrate.
As the flocculant, ammonium sulfate is more preferable.

  The use amount of the flocculant is preferably 5 parts by mass or more with respect to 100 parts by mass of the resin constituting the resin particles (X) and the resin particles (Z) from the viewpoint of controlling aggregation and obtaining a desired particle size. More preferably, it is 10 parts by mass or more, and further preferably 20 parts by mass or more. From the viewpoint of improving the low-temperature fixability, heat-resistant storage stability and chargeability of the obtained toner, it is preferably 50 parts by mass or less, more preferably 45 parts. It is not more than part by mass, more preferably not more than 40 parts by mass.

The flocculant is preferably added dropwise to the mixed dispersion. The flocculant may be added at once, or may be added intermittently or continuously. It is preferable to perform sufficient stirring during and after the addition.
The flocculant is preferably added dropwise as an aqueous solution from the viewpoint of controlling aggregation and obtaining aggregated particles having a desired particle size. The concentration of the aqueous solution of the flocculant is preferably 2% by mass or more, more preferably 4% by mass or more, and further preferably 6% by mass or more, from the viewpoint of controlling aggregation and obtaining aggregated particles having a desired particle size. And preferably it is 40 mass% or less, More preferably, it is 30 mass% or less, More preferably, it is 20 mass% or less, More preferably, it is 10 mass% or less.
From the viewpoint of controlling aggregation and obtaining aggregated particles having a desired particle size and particle size distribution, it is preferable to adjust the pH of the aqueous solution of the flocculant to 7.0 or more and 9.0 or less.

The dropping time of the aggregating agent is preferably 1 minute or more, more preferably 3 minutes or more from the viewpoint of controlling aggregation and obtaining aggregated particles having a desired particle diameter, and from the viewpoint of improving toner productivity. , Preferably 120 minutes or less, more preferably 30 minutes or less, still more preferably 10 minutes or less.
The temperature at which the flocculant is dropped is preferably 0 ° C. or higher, more preferably 10 ° C. or higher, further preferably 20 ° C. or higher, and preferably 45 ° C. or lower, from the viewpoint of improving the productivity of the toner. More preferably, it is 40 degrees C or less, More preferably, it is 35 degrees C or less, More preferably, it is 30 degrees C or less.

Further, from the viewpoint of promoting aggregation and obtaining aggregated particles having a desired particle size and particle size distribution, it is preferable to increase the temperature of the dispersion after adding the flocculant. The holding temperature is preferably 45 ° C. or higher, more preferably 50 ° C. or higher, further preferably 52 ° C. or higher, from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the obtained toner. The temperature is preferably 70 ° C. or lower, more preferably 65 ° C. or lower, and still more preferably 60 ° C. or lower.
It is preferable to confirm the progress of aggregation by monitoring the volume-median particle size of the aggregated particles in the temperature range.

The volume-median particle size (D ₅₀ ) of the obtained aggregated particles (1) is preferably 2 μm or more, more preferably 3 μm or more, from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the obtained toner. More preferably, it is 4 μm or more, and preferably 10 μm or less, more preferably 8 μm or less, and still more preferably 6 μm or less. The volume-median particle size of the aggregated particles (1) is determined by the method described in the examples.

<Step (2)>
Step (2) is a step of obtaining aggregated particles (2) by aggregating resin particles (Y) containing polyester resin (C) to aggregated particles (1) obtained in step (1).

(Resin particles (Y))
The resin particles (Y) are resins that constitute the shell portion of the toner obtained by the production method of the present invention, and contain a polyester resin (C).

The resin particles (Y) are produced by a method in which a resin component containing the polyester resin (C) and, if necessary, the above optional components are dispersed in an aqueous medium to obtain an aqueous dispersion of the resin particles (Y). It is preferable to do.
The method for obtaining an aqueous dispersion is the same as in the case of the resin particles (X), in which a resin or the like is added to an aqueous medium and dispersed using a disperser. From the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the obtained toner, a method using phase inversion emulsification is preferable.
As with the phase inversion emulsification method, as in the case of the resin particles (X), there is a method of phase inversion emulsification by adding an aqueous medium to a solution obtained by dissolving the resin and other optional components in an organic solvent. preferable. Preferred embodiments of the aqueous medium and organic solvent that can be used are also the same as the aqueous medium and organic solvent used in the method for producing the resin particles (X).

  The mass ratio of the organic solvent and the resin constituting the resin particles (Y) (organic solvent / resin constituting the resin particles (Y)) is a viewpoint that dissolves the resin and facilitates phase inversion to an aqueous medium, and the resin. From the viewpoint of improving the dispersion stability of the particles (Y), it is preferably 0.1 or more, more preferably 0.2 or more, still more preferably 0.4 or more, and preferably 4 or less, more preferably 3 Hereinafter, it is more preferably 1 or less.

Also in this production method, it is preferable to add a neutralizing agent to the solution. The preferable aspect of a neutralizing agent is the same as that of the neutralizing agent used for the manufacturing method of the said resin particle (X).
The degree of neutralization (mol%) of the polyester resin (C) with the neutralizing agent is preferably 10 mol% or more, more preferably 30 mol% or more, and preferably 150 mol% or less, more preferably 120 mol. % Or less, more preferably 100 mol% or less.

The amount of the aqueous medium to be added is preferably 100 parts by mass or more, more preferably 150 parts by mass with respect to 100 parts by mass of the resin constituting the resin particles (Y) from the viewpoint of improving the dispersion stability of the resin particles (Y). It is at least 200 parts by mass, more preferably at least 200 parts by mass, and preferably at most 900 parts by mass, more preferably at most 600 parts by mass, and even more preferably at most 400 parts by mass.
Further, from the viewpoint of improving the dispersion stability of the resin particles (Y), the mass ratio of the aqueous medium to the organic solvent (aqueous medium / organic solvent) is preferably 20/80 or more, more preferably 50/50 or more. More preferably, it is 80/20 or more, and preferably 95/5 or less, more preferably 90/10 or less, and still more preferably 85/15 or less.

The temperature at which the aqueous medium is added is preferably 60 ° C. or higher, more preferably 65 ° C. or higher, and preferably 85 ° C. or lower, more preferably, from the viewpoint of improving the dispersion stability of the resin particles (Y). Is 80 ° C. or lower, more preferably 75 ° C. or lower.
From the viewpoint of obtaining resin particles (Y) having a small particle size, the addition rate of the aqueous medium is preferably 0.1 with respect to 100 parts by mass of the resin constituting the resin particles (Y) until the phase inversion is completed. Parts by weight / minute or more, more preferably 0.5 parts by weight / minute or more, further preferably 1 part by weight / minute or more, still more preferably 3 parts by weight / minute or more, and preferably 50 parts by weight / minute. In the following, it is more preferably 30 parts by mass or less, further preferably 20 parts by mass or less, and still more preferably 10 parts by mass or less. There is no restriction | limiting in the addition rate of the aqueous medium after phase inversion.

You may have the process of removing an organic solvent from the dispersion obtained by phase inversion emulsification as needed after phase inversion emulsification.
A preferred embodiment of the method for removing the organic solvent and the remaining amount of the organic solvent in the aqueous dispersion is the same as the method for producing the resin particles (X).

(Solid content concentration)
The solid content concentration of the obtained aqueous dispersion of the resin particles (Y) is preferably 5% by mass or more from the viewpoint of improving the productivity of the toner and the dispersion stability of the resin particles (Y). Preferably it is 10 mass% or more, More preferably, it is 15 mass% or more, Preferably it is 50 mass% or less, More preferably, it is 40 mass% or less, More preferably, it is 30 mass% or less. In addition, solid content is the total amount of non-volatile components, such as resin and surfactant.

[Volume Median Particle Size (D ₅₀ ) of Resin Particles (Y)]
The volume median particle size (D ₅₀ ) of the resin particles (Y) in the aqueous dispersion is preferably 0.05 μm or more, more preferably 0.08 μm or more, from the viewpoint of obtaining a toner capable of obtaining a high-quality image. More preferably, it is 0.10 μm or more, and preferably 0.50 μm or less, more preferably 0.40 μm or less, and still more preferably 0.30 μm or less.

[CV value of resin particles (Y)]
The coefficient of variation (CV value) (%) of the particle size distribution of the resin particles (Y) is preferably 5% or more, more preferably from the viewpoint of improving the productivity of the aqueous dispersion of the resin particles (Y). From the viewpoint of obtaining a toner capable of obtaining a high-quality image, it is preferably 50% or less, more preferably 40% or less, and still more preferably 30% or less.

(Production of agglomerated particles (2))
In step (2), the resin particles (Y) are further adhered to the aggregated particles (1) by adding an aqueous dispersion of the resin particles (Y) to the dispersion of the aggregated particles (1) described above. It is preferable to obtain a dispersion of particles (2).

  Before adding the aqueous dispersion of resin particles (Y) to the dispersion of aggregated particles (1), an aqueous medium may be added to the dispersion of aggregated particles (1) for dilution. Further, when the aqueous dispersion of the resin particles (Y) is added to the dispersion of the aggregated particles (1), the coagulant is added in order to efficiently attach the resin particles (Y) to the aggregated particles (1). It may be used in the process.

  The temperature at which the aqueous dispersion of resin particles (Y) is added is preferably 40 ° C. or higher, more preferably 45 ° C. or higher, from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the obtained toner. Further, it is preferably 50 ° C. or higher, and preferably 80 ° C. or lower, more preferably 70 ° C. or lower, still more preferably 65 ° C. or lower.

The aqueous dispersion of the resin particles (Y) may be added continuously over a certain period of time, may be added at a time, or may be added in a plurality of divided portions, It is preferable to add continuously by adding or divided into a plurality of times. By adding as described above, the resin particles (Y) are likely to selectively adhere to the aggregated particles (1). Among these, from the viewpoint of promoting selective adhesion and improving the productivity of toner, it is preferable to add continuously over a certain period of time.
The addition rate in the case of continuous addition is preferably 0.1 ml with respect to 100 parts by mass of the aggregated particles (1) from the viewpoint of obtaining uniform aggregated particles (2) and improving the productivity of the toner. / Min or more, more preferably 0.3 ml / min or more, and preferably 2.0 ml / min or less, more preferably 1.5 ml / min or less, still more preferably 1.0 ml / min or less.

  The addition amount of the resin particles (Y) is the sum of the resin particles (Y), the resin particles (X), and the resin particles (Z) from the viewpoint of improving the low temperature fixability, heat resistant storage stability and chargeability of the toner. The mass ratio [(Y) / ((X) + (Z))] is preferably 0.1 or more, more preferably 0.15 or more, still more preferably 0.2 or more, and even more preferably 0.25 or more. The amount is preferably 0.9 or less, more preferably 0.6 or less, and still more preferably 0.4 or less.

[Volume Median Particle Size of Aggregated Particle (2)]
The volume-median particle size (D ₅₀ ) of the obtained aggregated particles (2) improves the viewpoint of obtaining a toner capable of obtaining a high-quality image, and improves the low-temperature fixability, heat-resistant storage stability, and chargeability of the obtained toner. From the viewpoint, it is preferably 2 μm or more, more preferably 3 μm or more, still more preferably 4 μm or more, and preferably 10 μm or less, more preferably 8 μm or less, and even more preferably 6 μm or less.

The total amount of the resin particles (Y) may be added, and aggregation may be stopped when the toner particles have grown to an appropriate particle size.
Examples of the method for stopping the aggregation include a method of cooling the dispersion, a method of adding an aggregation stopper, and a method of diluting the dispersion. From the viewpoint of reliably preventing unnecessary aggregation, a method of stopping aggregation by adding an aggregation stopper is preferable.

(Flocculation terminator)
As the aggregation terminator, a surfactant is preferable, and an anionic surfactant is more preferable. Examples of the anionic surfactant include alkylbenzene sulfonates, alkyl sulfates, alkyl ether sulfates, polyoxyalkylene alkyl ether sulfates, preferably polyoxyalkylene alkyl ether sulfates, more preferably polyoxyethylene. Lauryl ether sulfate, more preferably sodium polyoxyethylene lauryl ether sulfate.
An aggregation terminator can be used individually or in combination of 2 or more types.
The addition amount of the aggregation terminator is preferably 0 with respect to 100 parts by mass of the total amount of the resin particles (X), the resin particles (Z), and the resin particles (Y) from the viewpoint of surely preventing unnecessary aggregation. 1 part by mass or more, more preferably 1 part by mass or more, further preferably 2 parts by mass or more, and preferably 15 parts by mass or less, more preferably 10 parts by mass or less, from the viewpoint of reducing residual toner. More preferably, it is 7 parts by mass or less. The aggregation terminator is preferably added as an aqueous solution from the viewpoint of improving toner productivity.

  The temperature at which the aggregation terminator is added is preferably the same as the temperature at which the dispersion liquid of the aggregated particles (2) is retained from the viewpoint of improving toner productivity. Preferably it is 40 degreeC or more, More preferably, it is 45 degreeC or more, More preferably, it is 50 degreeC or more, Preferably it is 80 degreeC or less, More preferably, it is 70 degreeC or less, More preferably, it is 65 degreeC or less.

<Step (3)>
Step (3) is a step of obtaining core-shell particles by fusing the particles in the aggregated particles (2) obtained in step (2).
In the aggregated particles (2), the particles that are mainly physically attached to each other are fused and united to form toner particles having a core-shell structure.

In this step, from the viewpoint of improving the fusibility of the agglomerated particles and improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the resulting toner, a temperature equal to or higher than the glass transition temperature of the polyester resin (C). It is preferable to hold at.
The holding temperature in the fusing step is preferably a temperature higher than the glass transition temperature of the polyester resin (C), preferably 2 ° C. or higher, from the viewpoint of improving the fusing property of the aggregated particles and improving the productivity of the toner. The temperature is preferably higher by 4 ° C or higher, more preferably higher by 6 ° C or higher, and preferably 30 ° C or lower, more preferably 20 ° C or lower, more than the glass transition temperature of the polyester resin (C). The temperature is preferably 12 ° C. or higher.
At that time, the time for holding at a temperature equal to or higher than the glass transition temperature of the polyester resin (C) is preferably 1 minute or more, more preferably from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability and chargeability of the obtained toner. Is 10 minutes or more, more preferably 30 minutes or more, and preferably 240 minutes or less, more preferably 180 minutes or less, still more preferably 120 minutes or less, and even more preferably 90 minutes or less.

The volume-median particle size (D ₅₀ ) of the core-shell particles obtained in the step (3) is preferably 2 μm or more, more preferably from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the obtained toner. It is 3 μm or more, more preferably 4 μm or more, and preferably 10 μm or less, more preferably 8 μm or less, still more preferably 6 μm or less.
In addition, it is preferable that the volume median particle size of the core-shell particles obtained in the step (3) is not more than the volume median particle size of the aggregated particles (2). That is, in this step (3), it is preferable that aggregation and fusion of the aggregated particles do not occur.

<Post-processing process>
In the present invention, a post-treatment step may be performed after step (3), and it is preferable to obtain toner particles by isolation.
Since the core-shell particles obtained in the step (3) are present in the aqueous medium, it is preferable to first perform solid-liquid separation. For solid-liquid separation, a suction filtration method or the like is preferably used.
It is preferable to perform washing after the solid-liquid separation. At this time, since it is preferable to remove the added surfactant, it is preferable to wash with an aqueous medium below the cloud point of the surfactant. The washing is preferably performed a plurality of times.

  Next, it is preferable to perform drying. The drying temperature is preferably such that the temperature of the core-shell particles themselves is lower than the glass transition temperature of the composite resin (A). As a drying method, it is preferable to use a vacuum low temperature drying method, a vibration type fluidized drying method, a spray drying method, a freeze drying method, a flash jet method, or the like. The water content after drying is preferably adjusted to 1.5% by mass or less, more preferably 1.0% by mass or less, from the viewpoint of improving the chargeability of the toner.

(Toner particles)
The toner particles obtained by drying or the like can be used as they are as the toner for developing electrostatic images, but it is preferable to use the toner particles whose surfaces have been treated as described later as toners for developing electrostatic images. .
The volume median particle size (D ₅₀ ) of the toner particles is preferably 2 μm or more, more preferably from the viewpoint of improving toner productivity and from the viewpoint of improving low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. Is 3 μm or more, more preferably 4 μm or more, and preferably 10 μm or less, more preferably 8 μm or less, still more preferably 6 μm or less.
The CV value of the toner particles is preferably 12% or more, more preferably 14% or more, and further preferably 16% or more from the viewpoint of improving the productivity of the toner, and from the viewpoint of obtaining a high-quality image. Preferably it is 30% or less, More preferably, it is 26% or less, More preferably, it is 23% or less.
The circularity of the toner particles is preferably 0.955 or more, more preferably 0.960 or more, and still more preferably 0.965 or more, from the viewpoint of improving the low-temperature fixability, heat-resistant storage stability, and chargeability of the toner. And preferably 0.990 or less, more preferably 0.985 or less, and still more preferably 0.980 or less.

(External additive)
The toner particles can be used as the toner as they are, but it is preferable to use a toner obtained by adding a fluidizing agent or the like to the toner particle surface as an external additive.
Examples of the external additive include hydrophobic silica, titanium oxide fine particles, alumina fine particles, cerium oxide fine particles, inorganic fine particles such as carbon black, and polymer fine particles such as polycarbonate, polymethyl methacrylate, and silicone resin. Among these, Hydrophobic silica is preferred.
When surface treatment of toner particles is performed using an external additive, the amount of the external additive added is preferably 1 part by mass or more, more preferably 2 parts by mass or more, and still more preferably with respect to 100 parts by mass of the toner particles. It is 3 parts by mass or more, and preferably 5 parts by mass or less, more preferably 4.5 parts by mass or less, and still more preferably 4 parts by mass or less.

  The electrostatic image developing toner obtained by the present invention can be used as a one-component developer or mixed with a carrier and used as a two-component developer.

  Each property value of the composite resin, polyester resin, resin particle, toner, etc. was measured and evaluated by the following method.

[Acid value of composite resin and polyester resin]
It measured according to JIS K0070. However, the measurement solvent was chloroform.

[Softening point, crystallinity index, melting point and glass transition temperature of composite resin and polyester resin]
(1) Softening point Using a flow tester “CFT-500D” (manufactured by Shimadzu Corporation), a 1 g sample was heated at a heating rate of 6 ° C./min, and a load of 1.96 MPa was applied by a plunger. The nozzle was extruded from a nozzle having a length of 1 mm and a length of 1 mm. The amount of plunger drop of the flow tester was plotted against the temperature, and the temperature at which half of the sample flowed out was taken as the softening point.
(2) Crystallinity Index Using a differential scanning calorimeter “Q100” (manufactured by TA Instruments Japan Co., Ltd.), 0.01 to 0.02 g of a sample was weighed into an aluminum pan and room temperature (20 ° C. ) To 0 ° C. at a temperature drop rate of 10 ° C./min. Next, the sample was allowed to stand still for 1 minute, and then heated to 180 ° C. at a heating rate of 10 ° C./min, and the amount of heat was measured. Of the observed endothermic peaks, the peak temperature with the maximum peak area is defined as the endothermic maximum peak temperature (1), and (softening point (° C.)) / (Maximum endothermic peak temperature (1) (° C.)) The crystallinity index was determined.
(3) Melting point and glass transition temperature Using a differential scanning calorimeter “Q100” (manufactured by TA Instruments Japan Co., Ltd.), 0.01 to 0.02 g of a sample was weighed into an aluminum pan, and 200 ° C. The temperature was raised to 0 ° C. from the temperature at a temperature drop rate of 10 ° C./min. Next, the sample was heated at a temperature rising rate of 10 ° C./min, and the amount of heat was measured. Among the observed endothermic peaks, the temperature of the peak having the maximum peak area was defined as the maximum endothermic temperature (2). In the case of crystalline polyester, the peak temperature was taken as the melting point. In the case of amorphous polyester, when the peak is observed, the temperature of the peak is measured. When the step is observed without the peak being observed, the tangent indicating the maximum inclination of the curve of the step portion and the step The temperature at the intersection with the extended line of the base line on the high temperature side was defined as the glass transition temperature.

[Melting point of wax]
Using a differential scanning calorimeter “Q100” (manufactured by TA Instruments Japan Co., Ltd.), 0.01 to 0.02 g of a sample was weighed into an aluminum pan, heated to 200 ° C., and from that temperature It cooled to 0 degreeC with the temperature-fall rate 10 degreeC / min. Next, the sample was heated at a heating rate of 10 ° C./min, the amount of heat was measured, and the maximum peak temperature of endotherm was taken as the melting point.

[Volume Median Particle Size (D ₅₀ ) and CV Value of Resin Particles, Colorant Particles, and Wax Particles]
(1) Measuring apparatus: Laser diffraction type particle size measuring instrument “LA-920” (manufactured by Horiba, Ltd.)
(2) Measurement conditions: Distilled water was added to the measurement cell, and the volume-median particle size (D ₅₀ ) and the volume average particle size were measured at a concentration where the absorbance was in an appropriate range. The CV value was calculated according to the following formula.
CV value (%) = (standard deviation of particle size distribution / volume average particle size) × 100

[Aqueous dispersion of resin particles, dispersion of aggregated particles (1), dispersion of aggregated particles (2), colorant dispersion, and solid content concentration of wax particle dispersion]
Using an infrared moisture meter “FD-230” (manufactured by Kett Scientific Laboratory), a measurement sample 5 g was dried at a temperature of 150 ° C. and in a measurement mode 96 (monitoring time 2.5 min / variation width 0.05%). Moisture (mass%) was measured. The solid content concentration was calculated according to the following formula.
Solid content concentration (% by mass) = 100-water content (% by mass)

[Volume Median Particle Size (D ₅₀ ) of Aggregated Particle (1), Aggregated Particle (2), and Core-Shell Particle]
The volume median particle size (D ₅₀ ) of the aggregated particles and the core-shell particles was measured as follows.
Measuring instrument: “Coulter Multisizer (registered trademark) III” (manufactured by Beckman Coulter, Inc.)
・ Aperture diameter: 50μm
Analysis software: “Multisizer (registered trademark) III version 3.51” (manufactured by Beckman Coulter, Inc.)
Electrolyte: “Isoton (registered trademark) II” (manufactured by Beckman Coulter, Inc.)
-Measurement conditions: After adjusting the particle size of 30,000 particles to a concentration that can be measured in 20 seconds by adding the sample dispersion to 100 mL of the electrolyte solution, 30,000 particles are measured and the particle size distribution From this, the volume median particle size (D ₅₀ ) was determined.

[Volume Median Particle Size (D ₅₀ ) and CV Value of Toner Particles]
The volume median particle size of the toner particles was measured as follows.
The measuring instrument, aperture diameter, analysis software, and electrolyte solution were the same as the volume median particle diameter of the aggregated particles.
-Dispersion: Polyoxyethylene lauryl ether "Emulgen (registered trademark) 109P" (manufactured by Kao Corporation, HLB: 13.6) was dissolved in the electrolytic solution to obtain a dispersion having a concentration of 5% by mass.
-Dispersion condition: 10 mg of a toner particle measurement sample is added to 5 mL of the dispersion, and dispersed for 1 minute with an ultrasonic disperser, then 25 mL of electrolyte is added, and further dispersed for 1 minute with an ultrasonic disperser. To prepare a sample dispersion.
Measurement conditions: After adding the sample dispersion to 100 mL of the electrolyte solution, the particle size of 30,000 particles is adjusted to a concentration that can be measured in 20 seconds, and then 30,000 particles are measured. The volume-median particle size (D ₅₀ ) and the volume average particle size were determined from the distribution.
The CV value (%) was calculated according to the following formula.
CV value (%) = (standard deviation of particle size distribution / volume average particle size) × 100

[Toner particle circularity]
Using a flow particle image analyzer “FPIA-3000” (manufactured by Sysmex Corporation), the circularity of the toner particles was measured under the following conditions.
-Preparation of dispersion: A dispersion of toner particles was prepared by diluting with deionized water so that the solid content concentration was 0.001 to 0.05 mass%.
・ Measurement mode: HPF measurement mode

[Minimum fixing temperature of toner]
Using a commercially available printer “Microline (registered trademark) 5400” (manufactured by Oki Data Corporation) on high-quality paper “J paper A4 size” (manufactured by Fuji Xerox Co., Ltd.), the toner adhesion amount on the paper is 0.42 to 0. A solid image of .48 mg / cm ² was output without being fixed at a length of 50 mm, leaving a margin of 5 mm from the top edge of the A4 paper.
Next, the same printer with a variable temperature fixing device was prepared, the fixing device temperature was set to 90 ° C., and fixing was performed at a speed of 1.2 seconds per sheet in the A4 longitudinal direction to obtain a printed matter.
In the same manner, the temperature of the fixing device was increased by 5 ° C., and the fixing was performed to obtain a printed matter.
From the margin at the top edge of the printed image to the solid image, lightly paste a 50 mm long mending tape “Scotch (registered trademark) mending tape 810” (manufactured by Sumitomo 3M Limited, width 18 mm). After that, a weight of 500 g was placed and pressed once back and forth at a speed of 10 mm / sec. Thereafter, the affixed tape was peeled off from the lower end side at a peeling angle of 180 degrees and at a speed of 10 mm / sec to obtain a printed matter after the tape was peeled off. 30 sheets of high quality paper “Excellent White Paper A4 Size” (made by Oki Data Co., Ltd.) is laid under the printed material before and after the tape is applied, and the reflected image density of the fixed image portion before and after the tape is applied to each printed material. The measurement was performed using a colorimeter “SpectroEye” (manufactured by GretagMacbeth, Inc., light emission condition: standard light source D50, observation field of view 2 °, density standard DINNB, absolute white standard), and the fixing ratio was calculated from the following formula.
Fixing rate (%) = (Reflected image density after peeling tape / Reflected image density before applying tape) × 100
The lowest temperature at which the fixing rate was 90% or more was defined as the lowest fixing temperature. The lower the minimum fixing temperature, the better the low temperature fixing property.

[Heat resistant storage stability of toner]
20 g of toner was put in a wide-mouthed polybin having an internal volume of 100 ml, sealed, and allowed to stand for 48 hours in an environment of any temperature. Thereafter, it was allowed to stand for 12 hours or more while being sealed at a temperature of 25 ° C. and cooled. Next, a sieve having a mesh size of 250 μm is set on a vibrating table of “Powder Tester (registered trademark)” (manufactured by Hosokawa Micron Co., Ltd.), and 20 g of the toner is placed thereon, and the mixture is vibrated for 30 seconds. The maximum value of the arbitrary temperature of those that did not agglomerate (those that did not agglomerate) was defined as the maximum temperature at which no agglomeration occurred, and was used as an index for heat resistant storage stability. The larger the value, the more excellent the heat resistant storage stability of the toner.

[Toner chargeability]
Cylindrical polypropylene bottle (Nikko Hansen Co., Ltd.) of 50 ml containing 2.1 g of toner and 27.9 g of silicone ferrite carrier (manufactured by Kanto Denka Kogyo Co., Ltd., average particle size: 40 μm) at 25 ° C. and 50% RH ), And pre-stirred by shaking 10 times vertically and horizontally. Then, it mixed for 1 hour using the tumbler mixer "T2F" (made by Shinmaru Enterprises Co., Ltd.), and the charge amount was measured on condition of the following using "q / m-meter" (made by Epping).
-Mesh size: 635 mesh (aperture: 24 μm, made of stainless steel)
・ Soft blow: Blow pressure (600V)
-Suction time: 90 seconds The charge amount can be obtained by the following formula. The larger the absolute value of the numerical value, the better the chargeability.
Charge amount (μC / g) = Total amount of electricity after 90 seconds (μC) / Amount of attracted toner (g)

[Manufacture of core resin]
Production Example A1
(Production of composite resin A-1)
The inside of a four-necked flask equipped with a nitrogen introduction tube, a dehydration tube, a stirrer, and a thermocouple was replaced with nitrogen, and 2991 g of polyoxypropylene (2.2) -2,2-bis (4-hydroxyphenyl) propane, 397 g of terephthalic acid, 30 g of di (2-ethylhexanoic acid) tin (II) and 3 g of gallic acid were added, heated to 235 ° C. with stirring in a nitrogen atmosphere, and held at 235 ° C. for 5 hours. The pressure was reduced and held at 8 kPa for 1 hour. Thereafter, a mixture of 1961 g of styrene, 490 g of stearyl methacrylate, 99 g of acrylic acid and 294 g of dibutyl peroxide was added dropwise over 1 hour while cooling to 160 ° C. and maintaining at 160 ° C. Then, after maintaining at 160 ° C. for 30 minutes, the temperature was raised to 200 ° C., and the pressure in the flask was further lowered and maintained at 8 kPa for 1 hour. Then, after returning to atmospheric pressure, it cooled to 180 degreeC, fumaric acid 159g, sebacic acid 691g, trimellitic anhydride 164g, and 4-t-butyl catechol 3.8g were added, and 10 degreeC / hr to 220 degreeC. The temperature was raised, and then the reaction was carried out at 10 kPa to the desired softening point to obtain composite resin A-1. The physical properties are shown in Table 1.

Production Examples A2 to A4
(Production of composite resins A-2 to A-4)
Composite resins A-2 to A-4 were obtained in the same manner as in Production Example A1, except that the raw material composition was changed as shown in Table 1. The physical properties are shown in Table 1.

Production Example A5
(Production of polyester resin A-5)
The inside of a four-necked flask equipped with a nitrogen introduction tube, a dehydration tube, a stirrer, and a thermocouple was replaced with nitrogen, and 5001 g of polyoxypropylene (2.2) -2,2-bis (4-hydroxyphenyl) propane, 1186 g of terephthalic acid, 30 g of di (2-ethylhexanoic acid) tin (II) and 3 g of gallic acid were added, the temperature was raised to 230 ° C. with stirring in a nitrogen atmosphere, and the temperature was maintained at 230 ° C. for 8 hours. Then, 1149 g of dodecenyl succinic anhydride and 165 g of trimellitic anhydride are added, the temperature is raised to 220 ° C. at 10 ° C./hr, and then the reaction is carried out at 10 kPa to the desired softening point to obtain polyester resin A- 5 was obtained. The physical properties are shown in Table 1.

Production Example B1
(Production of crystalline polyester B-1)
The inside of a four-necked flask equipped with a nitrogen introduction tube, a dehydration tube, a stirrer, and a thermocouple was purged with nitrogen, and 3,416 g of 1,10-decanediol and 4084 g of sebacic acid were added. While stirring, the temperature was raised to 135 ° C., maintained at 135 ° C. for 3 hours, and then heated from 135 ° C. to 200 ° C. over 10 hours. Thereafter, 23 g of di (2-ethylhexanoic acid) tin (II) was added, and the mixture was further maintained at 200 ° C. for 1 hour, and then the pressure in the flask was lowered and maintained at 8.3 kPa for 1 hour. -1 was obtained. The physical properties are shown in Table 2.

Production Examples B2 to B4
(Production of crystalline polyesters B-2 to B-4)
Crystalline polyesters B-2 to B-4 were obtained in the same manner as in Production Example B1, except that the raw material composition was changed as shown in Table 2. The physical properties are shown in Table 2.

[Manufacture of resin for shell parts]
Production Example C1
(Production of polyester resin C-1)
The inside of a four-necked flask equipped with a nitrogen introduction tube, a dehydration tube, a stirrer, and a thermocouple was replaced with nitrogen, and 5001 g of polyoxyethylene (2.2) -2,2-bis (4-hydroxyphenyl) propane, 1788 g of terephthalic acid, 30 g of di (2-ethylhexanoic acid) tin (II) and 3 g of gallic acid were added, and the temperature was raised to 235 ° C. with stirring in a nitrogen atmosphere, and kept at 235 ° C. for 8 hours. Then, 179 g of fumaric acid, 206 g of dodecenyl succinic anhydride, 325 g of trimellitic anhydride and 3.8 g of 4-t-butylcatechol were added, and the temperature was raised to 220 ° C. at 10 ° C./hr. Thereafter, the pressure in the flask was lowered and the reaction was carried out at 10 kPa to the desired softening point to obtain polyester resin C-1. Table 3 shows the physical properties.

Production Example C2
(Production of polyester resin C-2)
A polyester resin C-2 was obtained in the same manner as in Production Example C1, except that the raw material monomer and the number of parts by mass of the polyester resin were changed as shown in Table 3. Table 3 shows the physical properties.

[Production of aqueous dispersion of core resin particles]
Production Example X1
(Production of aqueous dispersion X-1 of resin particles)
In a 3 L container equipped with a stirrer, reflux condenser, dropping funnel, thermometer and nitrogen introduction tube, 300 g of composite resin A-1 and 180 g of methyl ethyl ketone were placed and dissolved at 73 ° C. over 2 hours. 5 mass% sodium hydroxide aqueous solution was added to the obtained solution so that the neutralization degree might be 60 mol% with respect to the acid value of composite resin A-1, and it stirred for 30 minutes.
Next, while maintaining at 73 ° C., 1000 g of deionized water was added over 60 minutes while stirring at 200 r / min, and phase inversion emulsification was performed. While maintaining the temperature at 73 ° C., methyl ethyl ketone was distilled off under reduced pressure to obtain an aqueous dispersion. Thereafter, the aqueous dispersion was cooled to 30 ° C. while stirring at 280 r / min (peripheral speed 88 m / min), and then deionized water was added so that the solid concentration was 20% by mass. An aqueous dispersion X-1 was obtained. Table 4 shows the physical properties.

Production Examples X2 to X5
(Production of aqueous dispersions X-2 to X-5 of resin particles)
Except having changed the kind of resin as shown in Table 4, it carried out similarly to manufacture example X1, and obtained the aqueous dispersion X-2 to X-5 of the resin particle. Table 4 shows the physical properties.

Production Examples Z1-Z4
(Production of aqueous dispersions Z-1 to Z-4 of resin particles)
Except having changed the kind of resin as shown in Table 4, it carried out similarly to manufacture example X1, and obtained the aqueous dispersions Z-1 to Z-4 of the resin particle. Table 4 shows the physical properties.

[Production of aqueous dispersion of resin particles for shell]
Production Example Y1
(Production of aqueous dispersion Y-1 of resin particles)
In a 3 L container equipped with a stirrer, reflux condenser, dropping funnel, thermometer and nitrogen introduction tube, 300 g of polyester resin C-1 and 180 g of methyl ethyl ketone were placed and dissolved at 73 ° C. over 2 hours. A 5% by mass aqueous sodium hydroxide solution was added to the obtained solution so that the degree of neutralization was 60 mol% with respect to the acid value of the polyester resin, and the mixture was stirred for 30 minutes.
Next, while maintaining at 73 ° C., 900 g of deionized water was added over 60 minutes while stirring at 280 r / min (peripheral speed 88 m / min), and phase inversion emulsification was performed. While maintaining the temperature at 73 ° C., methyl ethyl ketone was distilled off under reduced pressure to obtain an aqueous dispersion. Thereafter, the aqueous dispersion was cooled to 30 ° C. while stirring at 280 r / min (peripheral speed 88 m / min), and then deionized water was added so that the solid content concentration became 23% by mass. An aqueous dispersion Y-1 was obtained. Table 5 shows the physical properties.

Production Example Y2
(Production of aqueous dispersion Y-2 of resin particles)
Except having changed the kind of polyester resin as shown in Table 5, it carried out similarly to manufacture example Y1, and obtained the aqueous dispersion Y-2 of the resin particle. Table 5 shows the physical properties.

[Production of wax particle dispersion]
Production Example D1
(Production of wax particle dispersion D-1)
In a beaker with an internal volume of 1 L, 213 g of deionized water, anionic surfactant “Latemul (registered trademark) ASK” (manufactured by Kao Corporation, alkenyl (mixture of hexadecenyl group and octadecenyl group), aqueous solution of dipotassium succinate, effective concentration 28% by mass ) After 5.36 g was mixed, 50 g of paraffin wax “HNP-9” (manufactured by Nippon Seiki Co., Ltd., melting point 75 ° C.) was added thereto, and the mixture was stirred with a homomixer while maintaining the temperature at 95 to 98 ° C. Thus, a preliminary dispersion was obtained.
While maintaining the temperature of the obtained preliminary dispersion at 90 to 95 ° C., using a high-pressure wet atomizer “Nanomizer (registered trademark) NM2-L200-D08” (manufactured by Yoshida Kikai Kogyo Co., Ltd.), After being treated twice with pressure, it was cooled to 25 ° C., deionized water was added, the solid content concentration was adjusted to 20% by mass, and wax particle dispersion D-1 was obtained. The volume median particle size (D ₅₀ ) of the wax particles in the dispersion was 0.44 μm, and the CV value was 40%.

Production Example D2
(Production of wax particle dispersion D-2)
In a beaker with an internal volume of 1 L, 480 g of deionized water, anionic surfactant “Latemul (registered trademark) ASK” (manufactured by Kao Corporation, alkenyl (mixture of hexadecenyl group and octadecenyl group) aqueous dipotassium succinate, effective concentration 28% by mass ) 4.29 g, Carnauba wax “Carnauba wax No. 1” (manufactured by Hiroyuki Kato, melting point 83 ° C., acid value 5 mg KOH / g) 120 g was added and stirred. While maintaining the temperature at 90 to 95 ° C., the mixture was subjected to a dispersion treatment for 30 minutes using an ultrasonic homogenizer “US-600T” (manufactured by Nippon Seiki Seisakusho Co., Ltd.), then cooled to 25 ° C. Ionized water was added to adjust the solid content concentration to 20% by mass to obtain a wax particle dispersion D-2. The volume median particle size (D ₅₀ ) of the wax particles in the dispersion was 0.50 μm, and the CV value was 34%.

[Production of colorant dispersion]
Production Example E1
(Production of Colorant Dispersion E-1)
In a 1 liter beaker, 116.2 g of a copper phthalocyanine pigment “ECB-301” (manufactured by Dainichi Seika Kogyo Co., Ltd.), an anionic surfactant “Neopelex (registered trademark) G-15” (manufactured by Kao Corporation, 154.9% sodium dodecylbenzenesulfonate aqueous solution) and 340 g of deionized water were mixed and dispersed for 3 hours at room temperature using a homogenizer, and then deionized water so that the solid concentration was 24% by mass. Was added to obtain a colorant dispersion E-1. The volume median particle size (D ₅₀ ) of the colorant particles in the dispersion was 118 nm.

[Production of toner]
Example 1
(Preparation of Toner 1)
In a three-liter four-necked flask equipped with a dehydration tube, a stirrer, and a thermocouple, 270 g of an aqueous dispersion X-1 of resin particles, 30 g of an aqueous dispersion Z-1 of resin particles, and a wax particle dispersion D- 1 28 g, coloring agent dispersion E-1 23 g, and nonionic surfactant “Emulgen (registered trademark) 150” (manufactured by Kao Corporation, polyoxyethylene (50 mol) lauryl ether) 6 g 10% by weight aqueous solution 6 g Mixed at 25 ° C. Next, while stirring the mixture, a solution adjusted to pH 8.1 by adding 4.8 mass% aqueous potassium hydroxide solution to an aqueous solution in which 17 g of ammonium sulfate was dissolved in 178 g of deionized water was added at 25 ° C. over 5 minutes. Then, the temperature was raised to 56 ° C. over 2 hours, and maintained at 56 ° C. until the volume-median particle size of the aggregated particles became 4.3 μm to obtain a dispersion of aggregated particles (1).
While maintaining the temperature of the dispersion of the agglomerated particles (1) at 56 ° C., 79 g of an aqueous dispersion Y-1 of resin particles was dropped at a rate of 0.3 ml / min to obtain a dispersion of the agglomerated particles (2). Obtained.
In the dispersion of the aggregated particles (2), 12.5 g of an anionic surfactant “Emar (registered trademark) E-27C” (manufactured by Kao Corporation, sodium polyoxyethylene lauryl ether sulfate, effective concentration 27% by mass), An aqueous solution mixed with 1200 g of deionized water was added. Thereafter, the temperature was raised to 73 ° C. over 1 hour, and kept at 73 ° C. until the circularity reached 0.970, thereby obtaining a dispersion of core-shell particles in which the aggregated particles were fused.
The obtained dispersion of core-shell particles was cooled to 30 ° C., the solid content of the dispersion was separated by suction filtration, washed with deionized water, and dried at 33 ° C. to obtain toner particles. Table 6 shows the physical properties of the obtained toner particles. 100 parts by mass of the toner particles, 2.5 parts by mass of hydrophobic silica “RY50” (manufactured by Nippon Aerosil Co., Ltd., number average particle size; 0.04 μm), and hydrophobic silica “Cabosil (registered trademark) TS720” (Cabot Japan) 1.0 part by mass (manufactured by Co., Ltd., number average particle size; 0.012 μm) was placed in a Henschel mixer, stirred, and passed through a 150 mesh sieve to obtain toner 1. Table 6 shows the evaluation of the toner.

Examples 2-6, Comparative Examples 2-5
(Production of toners 2 to 6 and 14 to 17)
Toners 2 to 6 and 14 to 17 were obtained in the same manner as in Example 1, except that the aqueous dispersion of resin particles and the wax particle dispersion used were changed as shown in Table 6. Table 6 shows the physical properties and evaluation.

Example 7
(Preparation of Toner 7)
In Example 1, toner 7 was prepared in the same manner as in Example 1 except that the amount of resin particle aqueous dispersion X-1 used was changed to 285 g, and the amount of resin particle aqueous dispersion Z-1 used was changed to 15 g. Obtained. Table 6 shows the physical properties and evaluation.

Example 8
(Production of Toner 8)
In Example 1, toner 8 was prepared in the same manner as in Example 1 except that the amount of resin particle aqueous dispersion X-1 used was changed to 240 g and the amount of resin particle aqueous dispersion Z-1 used was changed to 60 g. Obtained. Table 6 shows the physical properties and evaluation.

Example 9
(Preparation of Toner 9)
A toner 9 was obtained in the same manner as in Example 1 except that the amount of the wax particle dispersion D-1 used in Example 1 was changed to 14 g. Table 6 shows the physical properties and evaluation.

Example 10
(Production of Toner 10)
A toner 10 was obtained in the same manner as in Example 1 except that the amount of the wax particle dispersion D-1 used in Example 1 was changed to 56 g. Table 6 shows the physical properties and evaluation.

Example 11
(Production of Toner 11)
A toner 11 was obtained in the same manner as in Example 1 except that the amount of the wax particle dispersion D-1 used in Example 1 was changed to 84 g. Table 6 shows the physical properties and evaluation.

Example 12
(Preparation of Toner 12)
In Example 1, the usage amount of the aqueous dispersion X-1 of resin particles was changed to 240 g, the usage amount of the aqueous dispersion Z-1 of resin particles was changed to 60 g, and the usage amount of the wax particle dispersion D-1 was changed to 84 g. A toner 12 was obtained in the same manner as in Example 1 except that. Table 6 shows the physical properties and evaluation.

Comparative Example 1
(Preparation of Toner 13)
In Example 1, a toner 13 was obtained in the same manner as in Example 1 except that the amount of the resin particle aqueous dispersion X-1 used was 300 g and the resin particle aqueous dispersion Z-1 was not used. . Table 6 shows the physical properties and evaluation.

  From Table 6, it can be seen that the toners of Examples 1 to 12 are superior to the toners of Comparative Examples 1 to 5 in terms of both low-temperature fixability and heat-resistant storage stability and excellent chargeability.

Claims (11)

An electrostatic charge image developing toner having a core-shell structure,
The binder resin containing the composite resin (A) and the crystalline polyester (B) and the wax are contained in the core portion, the binder resin containing the polyester resin (C) is contained in the shell portion,
A composite resin (A) comprising a polyester resin obtained by polycondensation of an alcohol component containing 80 mol% or more of a propylene oxide adduct of bisphenol A and a polyvalent carboxylic acid component, and a styrene compound A composite resin containing a vinyl resin segment (a2) containing a structural unit derived from,
The crystalline polyester (B) contains an alcohol component containing at least 80 mol% of an α, ω-aliphatic diol having 8 to 16 carbon atoms and at least 80 mol% of an aliphatic saturated dicarboxylic acid having 8 to 16 carbon atoms. A crystalline polyester obtained by polycondensation with a polycarboxylic acid component
A toner for developing electrostatic images, wherein the polyester resin (C) is a polyester resin obtained by polycondensation of an alcohol component containing 80 mol% or more of an ethylene oxide adduct of bisphenol A and a polyvalent carboxylic acid component.   The toner for developing an electrostatic charge image according to claim 1, wherein a mass ratio [(A) / (B)] of the composite resin (A) and the crystalline polyester (B) is 70/30 to 98/2.   The polyester resin (C) contains 2 succinic acids having an alcohol component containing 80 mol% or more of bisphenol A ethylene oxide adduct and an alkyl group having 4 to 18 carbon atoms or an alkenyl group having 4 to 18 carbon atoms. The toner for developing an electrostatic charge image according to claim 1, which is an amorphous polyester obtained by polycondensation with a polyvalent carboxylic acid component contained in an amount of from 20% to 20% by mole.   The toner for developing an electrostatic charge image according to any one of claims 1 to 3, wherein the raw material vinyl monomer which is a component derived from the vinyl resin segment (a2) contains a styrene compound in an amount of 50 mass% to 95 mass%.   The electrostatic charge image development in any one of Claims 1-4 which contains 5 to 50 mass% of (meth) acrylic acid esters in the raw material vinyl monomer which is a origin component of a vinyl-type resin segment (a2). Toner.   The toner for developing an electrostatic charge image according to claim 1, wherein the composite resin (A) contains a structural unit derived from both reactive monomers.   The toner for developing an electrostatic charge image according to claim 1, wherein the α, ω-aliphatic diol has 9 to 12 carbon atoms.   The toner for developing an electrostatic charge image according to claim 1, wherein the aliphatic saturated dicarboxylic acid has 10 to 12 carbon atoms.   The electrostatic charge image development according to any one of claims 1 to 8, wherein the content of the wax is 2 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the total amount of the binder resin contained in the core part. Toner.   The toner for developing an electrostatic charge image according to claim 1, wherein the content of the wax is 1 part by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the total amount of the binder resin in the toner. . The method for producing a toner for developing an electrostatic image according to claim 1, comprising the following steps (1) to (3).
Step (1): A step of obtaining aggregated particles (1) by aggregating resin particles (X) containing composite resin (A), resin particles (Z) containing crystalline polyester (B), and wax particles. Step (2): Aggregating particles (1) are aggregated with resin particles (Y) containing polyester resin (C) to obtain aggregated particles (2) Step (3): Aggregating particles (2) are melted Process of obtaining core-shell particles by attaching