JP2014026075A - Toner, developer using the toner, and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toner that solves the failure that the occurrence of density unevenness of images caused by a decrease in transferability due to environmental change, which is the problem in a toner containing a crystalline resin, and has excellent low-temperature fixability and high-temperature offset resistance.SOLUTION: A toner contains at least a binder resin, colorant, and a charge control agent; the binder resin includes a urethane- and/or urea-modified crystalline resins; and the charge control agent contains a polycondensate obtained by polycondensation reaction of phenols and aldehydes.

Description

  The present invention relates to a toner, a developer using the toner, and an image forming apparatus.

In recent years, toners have a smaller particle size for higher quality and higher definition of output images, high temperature offset resistance, low temperature fixability for energy saving, and high temperature during storage and transportation after production. There is a demand for heat-resistant storage that can withstand high humidity.

Conventionally, toner prepared by a kneading and pulverizing method has been used. In the kneading and pulverization method, it is difficult to reduce the particle size, and the toner particles produced by kneading and pulverization have an irregular shape and a broad particle size distribution, so that the quality of the output image is not sufficient. There are problems such as lack of fixing power and high fixing energy.

In addition, when adding a wax (release agent) to improve fixability, the kneading and pulverization method tends to break at the interface between the binder resin and the wax during pulverization, so that a large amount of wax is present on the toner particle surface. Resulting in. For this reason, while a releasing effect is produced, toner adhesion (filming) is likely to occur on the carrier, the photoconductor and the blade, and the overall performance is not satisfactory.

Therefore, in order to overcome the above-mentioned problems caused by the kneading and pulverizing method, a toner manufacturing method by a polymerization method has been proposed.
The toner produced by the polymerization method can be easily reduced in particle size, the particle size distribution is sharper than that of the toner produced by the pulverization method, and the release agent can be included. .

As a method for producing a toner by a polymerization method, for example, Japanese Patent Application Laid-Open No. 11-133665 of Patent Document 1 is modified with urethane as a toner binder for the purpose of improving low-temperature fixability and high-temperature offset resistance. A method for producing toner from polyester elongation reactants is disclosed.

  JP-A-2002-287400 of Patent Document 2 and JP-A-2002-351143 of Patent Document 3 are excellent in powder fluidity and transferability in the case of a toner having a small particle diameter, and have heat-resistant storage stability. In addition, a method for producing a toner excellent in both low-temperature fixability and high-temperature offset resistance is disclosed.

  Japanese Patent No. 2579150 of Patent Document 4 and Japanese Patent Application Laid-Open No. 2011-158819 of Patent Document 5 are for producing a toner binder having a stable molecular weight distribution in order to achieve both low temperature fixability and high temperature offset resistance. A method for producing a toner having an aging step is disclosed.

JP-A-8-176310 of Patent Document 6 contains a resin containing a crystalline polyester resin and a release agent for the purpose of obtaining a high level of low-temperature fixability, and the resin and the wax are out of phase with each other. A toner having a sea-island phase separation structure is proposed, and Japanese Patent Application Laid-Open No. 2005-15589 of Patent Document 7 proposes a toner containing a crystalline polyester resin, a release agent, and a graft polymer. ing.

The above toner is obtained by fixing at a low temperature by utilizing the fact that the crystalline polyester resin melts more rapidly than the amorphous polyester resin.
However, in the toner containing crystalline polyester, the charge retention performance of crystalline polyester is lower than that of amorphous polyester resin. The amount of charge per one becomes small, the transfer performance is deteriorated (image density unevenness due to transferability), and the demand for high image quality has not been met.

Although it does not contain crystalline polyester, Japanese Patent Application Laid-Open No. 2010-49228 of Patent Document 8 and 2010-128002 of Patent Document 9 disclose polycondensation reactions of phenols and aldehydes as charge control agents. A toner is disclosed that uses the condensation polymer obtained by the above method to uniformly charge the toner particle surface, has excellent transferability, and can stably form a high-quality image. It is not a thing, and low temperature fixability is not enough.

In addition, as a toner containing a crystalline polyester resin and a condensation polymer obtained by a condensation polymerization reaction of phenols and aldehydes, a pulverized toner is disclosed in Japanese Patent Application Laid-Open No. 2010-164837. It is disclosed.
However, the use of a condensation polymer obtained by the condensation polymerization reaction of phenols and aldehydes reduces the charge retention performance of the toner due to environmental changes such as temperature and atmospheric humidity caused by the crystalline polyester resin. This cannot be prevented, and transferability deteriorates (density unevenness occurs in the transferred image due to a decrease in transfer rate).

The present invention provides a toner having excellent low-temperature fixability and high-temperature offset resistance by solving the problem of uneven density of an image due to a decrease in transferability due to an environmental change, which is a problem in a toner containing a crystalline resin. The purpose is to do.

  As a result of intensive studies by the present inventors, a polycondensate obtained by introducing a urethane and / or urea group skeleton into a crystalline resin and obtained by a polycondensation reaction between a phenol and an aldehyde as a charge control agent As a result, it has been found that there is no unevenness in image density and that both low-temperature fixability and high-temperature offset resistance can be achieved, and the present invention has been completed.

That is, the said subject is solved by following (1)-(10) of this invention.
(1) “Toner containing at least a binder resin, a colorant, and a charge control agent, wherein the binder resin contains urethane and / or urea-modified crystalline resin, and the charge control agent Is a toner comprising a polycondensate obtained by a polycondensation reaction of phenols and aldehydes, "
(2) “The toner according to item (1), wherein the modified crystalline resin is a crystalline polyester resin”;
(3) “The modified crystalline resin has a structural unit derived from an aliphatic dicarboxylic acid and a structural unit derived from an aliphatic diol, and has a melting point of 50 ° C. or higher and lower than 80 ° C. The toner according to (1) or (2) ”,
(4) "The glass transition temperature of the first heating Tg (1 ^st), when the glass transition temperature in the temperature elevation second time was Tg (2 ^nd), the difference in Tg (1 ^st) and Tg (2 ^nd) The toner according to any one of (1) to (3) above, wherein the toner is 10 ° C. or higher and lower than 30 ° C .;
(5) "The toner according to any one of (1) to (4) above, wherein the toner has inorganic fine particles therein",
(6) “The toner according to item (5), wherein the inorganic fine particles are layered inorganic minerals obtained by converting at least part of ions between layers with organic ions”,
(7) “The phenols include a phenol compound (A) having one phenolic hydroxyl group and a phenol compound (B) having two or more phenolic hydroxyl groups, and the phenol compound (A). And the phenol compound (B), wherein the ortho-position of the phenolic hydroxyl group is hydrogen, the toner according to any one of (1) to (6) above,
(8) “The phenol compound (A) is at least one selected from the group consisting of p-alkylphenol, p-aralkylphenol, p-phenylphenol, and p-hydroxybenzoic acid ester,
The phenol compound (B) is at least one selected from the group consisting of bisphenols, trisphenols, tetrakisphenols,
The toner according to (7) above, wherein the aldehyde is paraformaldehyde and / or formaldehyde ”,
(9) "Developer comprising the toner according to any one of (1) to (8)",
(10) “An image forming apparatus comprising the toner according to any one of (1) to (8)”.

  As will be understood from the following detailed and specific description, according to the present invention, the problem of unevenness in image density due to deterioration in transferability due to environmental changes, which is a problem in toner containing crystalline resin, is solved. Therefore, it is possible to provide a toner having excellent low-temperature fixability and high-temperature offset resistance.

It is a figure which shows an example of the image forming apparatus of this invention.

The toner of the present invention will be described in detail.
The toner of the present invention is a toner containing at least a binder resin, a colorant, and a charge control agent, wherein the binder resin contains urethane and / or urea-modified crystalline polyester resin, The charge control agent contains a polycondensate obtained by a polycondensation reaction of phenols and aldehydes.

The toner containing the crystalline polyester is excellent in low-temperature fixability, but is charged immediately after the preparation of the developer (in the state of the initial agent). Deterioration of transferability (occurrence of density unevenness in a post-transfer image due to a decrease in transfer rate) may occur.

The deterioration of the transferability is remarkable especially in a high temperature and high humidity environment. As a result, the transferred toner cannot retain the charge, and as a result of the decrease in the charge, it is difficult for the transfer electric field to move from the photoreceptor to the transfer medium. Therefore, this is considered to be a phenomenon caused by the occurrence of a location having a low transfer rate locally in the image.

Factors that cause such trouble are that the crystalline polyester is incompatible with other amorphous resins, the resistance of the crystalline polyester resin is low, and there is no charge retention site, etc. Presumed to be due.

Therefore, it is considered effective to add a component that suppresses the decrease in charge retention performance to the toner, and as a result of investigating the component that suppresses the decrease in charge retention performance of the toner, it contains a large amount of a phenol skeleton that serves as a charge retention site. It has been found that a charge control agent is effective. Furthermore, it has been found that a toner excellent in both charge acquisition and charge retention performance can be obtained by coexistence of a low-resistance crystalline polyester resin and a charge control agent containing a large amount of a phenol skeleton excellent in charge retention performance. It was.

The reason for this is not clear, but the modified crystalline polyester resin is incompatible with the charge control agent having a phenol skeleton, and is derived from affecting the dispersion state, dispersion system, etc. of the charge control agent having a phenol skeleton. Presumed.

<Modified crystalline polyester resin>
The modified crystalline polyester resin of the present invention is a modified crystalline polyester resin having a urethane skeleton and / or a urea skeleton.
The modified crystalline polyester resin has a urethane skeleton and / or a urea skeleton, has a low acid value, a high cohesive force, and a low compatibility with an amorphous polyester resin. By dispersing the crystal particles in the toner particles, the strength of the toner particles is improved, image degradation due to the occurrence of spent and filming in the developing machine can be prevented, and compatibility with the amorphous polyester resin can be achieved. It is possible to prevent the toner from being deteriorated in high temperature and high humidity storage stability.
In addition, the modified crystalline polyester resin has high crystallinity, and thus exhibits a heat melting characteristic that shows a sharp viscosity drop near the fixing start temperature, and has good heat-resistant storage stability due to crystallinity until just before the melting start temperature. At the starting temperature, a sudden drop in viscosity (sharp melt) occurs due to the melting of the modified crystalline polyester resin, and as a result, the viscosity is drastically reduced due to compatibility with the amorphous polyester resin. The mold release width (difference between the minimum fixing temperature and the high temperature resistant offset occurrence temperature) also shows good results.

The modified crystalline polyester resin of the present invention can be obtained by isocyanate-modifying the end of the crystalline polyester and reacting with a curing agent containing an active hydrogen group such as an amine.

Examples of the monomer of the crystalline polyester resin include polycondensation polyester resins synthesized from polyols and polycarboxylic acids exemplified below, lactone ring-opening polymers, and polyhydroxycarboxylic acids.
Among these, a polycondensation polyester resin of an aliphatic diol and an aliphatic dicarboxylic acid is particularly preferable because it has high crystallinity and can achieve both low-temperature fixability and heat-resistant storage stability at a high level.

(Polyol)
Examples of the polyol include diols, trivalent to octavalent or higher polyols.

The diol can be appropriately selected depending on the purpose. For example, an aliphatic diol such as a linear aliphatic diol or a branched aliphatic diol having 2 to 36 chain carbon atoms; an alkylene ether having 4 to 36 Glycol; alicyclic diol having 4 to 36 carbon atoms; alkylene oxide of the alicyclic diol (hereinafter abbreviated as AO); AO adduct of bisphenols; polylactone diol; polybutadiene diol; diol having carboxyl group, sulfone Examples include diols having an acid group or sulfamic acid group, and diols having other functional groups such as salts thereof.
Among these, an aliphatic diol having 2 to 36 chain carbon atoms is preferable, and a linear aliphatic diol is more preferable. These may be used individually by 1 type and may use 2 or more types together.

  As content with respect to the whole diol of a linear aliphatic diol, 80 mol% or more is preferable and 90 mol% or more is more preferable. When the content is 80 mol% or more, the crystallinity of the resin is improved, the compatibility between the low-temperature fixability and the heat-resistant storage stability is good, and the resin hardness tends to be improved.

The linear aliphatic diol can be appropriately selected according to the purpose. For example, ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6 -Hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, 1,13- Examples include tridecanediol, 1,14-tetradecanediol, 1,18-octadecanediol, 1,20-eicosanediol, and the like.
Among these, ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, 1,9-nonanediol, and 1,10-decanediol are preferable in view of availability.

  The branched aliphatic diol having 2 to 36 chain carbon atoms can be appropriately selected according to the purpose. For example, 1,2-propylene glycol, butanediol, hexanediol, octanediol, decanediol, dodecane Examples include diol, tetradecanediol, neopentyl glycol, 2,2-diethyl-1,3-propanediol.

  As said C4-C36 alkylene ether glycol, it can select suitably according to the objective, For example, diethylene glycol, triethylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol etc. are mentioned. It is done.

  As said C4-C36 alicyclic diol, it can select suitably according to the objective, For example, 1, 4- cyclohexane dimethanol, hydrogenated bisphenol A, etc. are mentioned.

  The alkylene oxide (hereinafter abbreviated as AO) of the alicyclic diol can be appropriately selected according to the purpose. For example, ethylene oxide (hereinafter abbreviated as EO), propylene oxide (hereinafter abbreviated as PO). And adducts (number of added moles of 1 to 30) such as butylene oxide (hereinafter abbreviated as BO).

  The bisphenols can be appropriately selected according to the purpose, and examples thereof include AO (EO, PO, BO, etc.) addition products (addition mole number: 2 to 30) such as bisphenol A, bisphenol F, and bisphenol S. Can be mentioned.

  The polylactone diol can be appropriately selected depending on the purpose, and examples thereof include poly ε-caprolactone diol.

  The diol having a carboxyl group can be appropriately selected depending on the purpose, and examples thereof include 2,2-dimethylolpropionic acid (DMPA), 2,2-dimethylolbutanoic acid, 2,2-dimethylolheptane. Examples thereof include acids and dialkyrol alkanoic acids having 6 to 24 carbon atoms such as 2,2-dimethyloloctanoic acid.

  The diol having the sulfonic acid group or the sulfamic acid group can be appropriately selected according to the purpose. For example, N, N-bis (2-hydroxyethyl) sulfamic acid and N, N-bis (2- Hydroxyethyl) sulfamic acid PO2 molar adducts such as sulfamic acid diol [N, N-bis (2-hydroxyalkyl) sulfamic acid (alkyl group having 1 to 6 carbon atoms) and its AO adduct (AO is EO or PO And the number of moles of AO added 1-6); bis (2-hydroxyethyl) phosphate and the like.

  The neutralizing base of the diol having these neutralizing bases can be appropriately selected according to the purpose. For example, the tertiary amine having 3 to 30 carbon atoms (such as triethylamine), alkali metal (such as sodium salt) Etc.

  Among these, alkylene glycols having 2 to 12 carbon atoms, diols having a carboxyl group, AO adducts of bisphenols, and combinations thereof are preferable.

Further, the trivalent to octavalent or higher polyols used as necessary can be appropriately selected according to the purpose. For example, alkane polyols and their intramolecular or intermolecular dehydrates (for example, glycerin, trivalent). Methylolethane, trimethylolpropane, pentaerythritol, sorbitol, sorbitan, polyglycerin, etc.), sugars and derivatives thereof (for example, sucrose, methylglucoside, etc.), etc. Polyhydric aliphatic alcohols; AO adducts of trisphenols (trisphenol PA, etc.) (addition mole number 2-30); AO adducts of novolac resins (phenol novolac, cresol novolak, etc.) (addition moles 2-30) Hydroxyethyl (meth) acrylate and other vinyl monomers And acrylic polyols such as a copolymer thereof.
Among these, trivalent to octavalent or higher polyhydric aliphatic alcohols and novolak resin AO adducts are preferred, and novolak resin AO adducts are more preferred.

(Polycarboxylic acid)
Examples of the polycarboxylic acid include dicarboxylic acids, trivalent to hexavalent or higher polycarboxylic acids.

  The dicarboxylic acid can be appropriately selected depending on the purpose, and examples thereof include aliphatic dicarboxylic acids such as linear aliphatic dicarboxylic acids and branched aliphatic dicarboxylic acids; aromatic dicarboxylic acids and the like. . Among these, linear aliphatic dicarboxylic acid is more preferable.

  The aliphatic dicarboxylic acid can be appropriately selected according to the purpose. For example, the aliphatic dicarboxylic acid has 4 to 36 carbon atoms such as succinic acid, adipic acid, sebacic acid, azelaic acid, dodecanedicarboxylic acid, octadecanedicarboxylic acid, decylsuccinic acid and the like. Alkanedicarboxylic acids such as dodecenyl succinic acid, pentadecenyl succinic acid, alkenyl succinic acid such as octadecenyl succinic acid, maleic acid, fumaric acid, citraconic acid and other alkenedicarboxylic acids having 4 to 36 carbon atoms; dimer acid ( Suitable examples include alicyclic dicarboxylic acids having 6 to 40 carbon atoms such as dimerized linoleic acid.

  The aromatic dicarboxylic acid can be appropriately selected according to the purpose. For example, phthalic acid, isophthalic acid, terephthalic acid, t-butylisophthalic acid, 2,6-naphthalenedicarboxylic acid, 4,4′-biphenyl Preferable examples include aromatic dicarboxylic acids having 8 to 36 carbon atoms such as dicarboxylic acids.

Examples of the trivalent to hexavalent or higher polycarboxylic acid used as necessary include C9-20 aromatic polycarboxylic acids such as trimellitic acid and pyromellitic acid.
As the dicarboxylic acid or the trivalent to hexavalent or higher polycarboxylic acid, the above acid anhydrides or lower alkyl esters having 1 to 4 carbon atoms (methyl ester, ethyl ester, isopropyl ester, etc.) are used. It may be used.

Among the dicarboxylic acids, it is particularly preferable to use the aliphatic dicarboxylic acid (preferably adipic acid, sebacic acid, dodecanedicarboxylic acid, terephthalic acid, isophthalic acid, etc.) alone, but the aromatic dicarboxylic acid and the aromatic Those obtained by copolymerizing an aromatic dicarboxylic acid (preferably terephthalic acid, isophthalic acid, t-butylisophthalic acid, etc .; lower alkyl esters of these aromatic dicarboxylic acids, etc.) are also preferred.
The copolymerization amount of the aromatic dicarboxylic acid is preferably 20 mol% or less.

(Lactone ring-opening polymer)
The lactone ring-opening polymer can be appropriately selected depending on the purpose, and examples thereof include monolactones having 3 to 12 carbon atoms such as β-propiolactone, γ-butyrolactone, δ-valerolactone, and ε-caprolactone. A lactone ring-opening polymer obtained by ring-opening polymerization of a lactone such as (one ester group in the ring) using a catalyst such as a metal oxide or an organometallic compound; glycol (for example, ethylene glycol) as an initiator , Diethylene glycol, etc.) and a lactone ring-opening polymer having a hydroxyl group at the terminal, obtained by ring-opening polymerization of the monolactone having 3 to 12 carbon atoms.

The mono-lactone having 3 to 12 carbon atoms can be appropriately selected according to the purpose, but ε-caprolactone is preferable from the viewpoint of crystallinity.
Moreover, as said lactone ring-opening polymer, you may use a commercial item, As this commercial item, highly crystalline polycaprolactone, such as H1P, H4, H5, H7 of the PLACEL series by Daicel Corporation, etc. Is mentioned.

(Polyhydroxycarboxylic acid)
The method for preparing the polyhydroxycarboxylic acid can be appropriately selected according to the purpose. For example, a method for directly dehydrating and condensing hydroxycarboxylic acids such as glycolic acid and lactic acid (L-form, D-form, racemic form, etc.). A cyclic ester having 4 to 12 carbon atoms corresponding to a dehydration condensate between two or three molecules of hydroxycarboxylic acid such as glycolide or lactide (L-form, D-form, racemate, etc.) 3)) using a catalyst such as a metal oxide or an organometallic compound, and the like. The method of ring-opening polymerization is preferable from the viewpoint of adjusting the molecular weight.

  Among the cyclic esters, L-lactide and D-lactide are preferable from the viewpoint of crystallinity. These polyhydroxycarboxylic acids may be modified so that the terminal is a hydroxyl group or a carboxyl group.

(Isocyanate)
As the isocyanate component for modifying the terminal of the crystalline polyester, diisocyanate can be used. As the diisocyanate, aromatic diisocyanate having 6 to 20 carbon atoms (excluding carbon in the NCO group, the same shall apply hereinafter), carbon Aliphatic diisocyanates having 2 to 18 carbon atoms, alicyclic diisocyanates having 4 to 15 carbon atoms, araliphatic diisocyanates having 8 to 15 carbon atoms and modified products of these diisocyanates (urethane groups, carbodiimide groups, allophanate groups, urea groups, A buret group, a uretdione group, a uretoimine group, an isocyanurate group, an oxazolidone group-containing modified product) and a mixture of two or more thereof. If necessary, trivalent or higher polyisocyanates may be used in combination.

  Specific examples of the aromatic diisocyanate and the trivalent or higher polyisocyanate include 1,3- and / or 1,4-phenylene diisocyanate, 2,4- and / or 2,6-tolylene diisocyanate ( TDI), crude TDI, 2,4′- and / or 4,4′-diphenylmethane diisocyanate (MDI), crude MDI [crude diaminophenylmethane [condensation product of formaldehyde with an aromatic amine (aniline) or a mixture thereof; A mixture of diaminodiphenylmethane and a small amount (for example, 5 to 20% by mass) of a trifunctional or higher functional polyamine] Phosgenation product: polyallyl polyisocyanate (PAPI)], 1,5-naphthylene diisocyanate, 4,4 ′, 4 "-Triphenylmethane triisocyanate, m- and p-isocyanate Such as preparative phenylsulfonyl isocyanate.

  Specific examples of the aliphatic diisocyanate and the trivalent or higher polyisocyanate include ethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), dodecamethylene diisocyanate, 1,6,11-undecane triisocyanate, 2,2 , 4-trimethylhexamethylene diisocyanate, lysine diisocyanate, 2,6-diisocyanatomethylcaproate, bis (2-isocyanatoethyl) fumarate, bis (2-isocyanatoethyl) carbonate, 2-isocyanatoethyl-2, Examples include 6-diisocyanatohexanoate.

  Specific examples of the alicyclic diisocyanate include isophorone diisocyanate (IPDI), dicyclohexylmethane-4,4′-diisocyanate (hydrogenated MDI), cyclohexylene diisocyanate, methylcyclohexylene diisocyanate (hydrogenated TDI), bis (2- And isocyanatoethyl) -4-cyclohexene-1,2-dicarboxylate, 2,5- and / or 2,6-norbornane diisocyanate.

  Specific examples of the aromatic aliphatic diisocyanate include m- and / or p-xylylene diisocyanate (XDI), α, α, α ′, α′-tetramethylxylylene diisocyanate (TMXDI), and the like.

Examples of the modified diisocyanate include urethane group, carbodiimide group, allophanate group, urea group, burette group, uretdione group, uretoimine group, isocyanurate group, and oxazolidone group-containing modified product.
Specifically, modified MDI (urethane-modified MDI, carbodiimide-modified MDI, trihydrocarbyl phosphate-modified MDI, etc.), a modified diisocyanate such as urethane-modified TDI, and a mixture of two or more of these [for example, modified MDI and urethane-modified TDI (Combined use with an isocyanate-containing prepolymer)] is included.

Of these, preferred are aromatic diisocyanates having 6 to 15 carbon atoms, aliphatic diisocyanates having 4 to 12 carbon atoms, and alicyclic diisocyanates having 4 to 15 carbon atoms, and particularly preferred are TDI, MDI, HDI, water. Attached MDI and IPDI.

(Curing agent)
As the curing agent, a conventionally known amine compound can be suitably used.
Examples of diamines (including triamine or higher polyamines used as necessary) include aliphatic diamines (C2 to C18): [1] aliphatic diamines (C2 to C6 alkylenediamines (ethylenediamine, propylenediamine, trimethylene) Diamine, tetramethylenediamine, hexamethylenediamine, etc.), polyalkylene (C2-C6) diamine (diethylenetriamine, iminobispropylamine, bis (hexamethylene) triamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, etc.)) [2] These alkyl (C1 to C4) or hydroxyalkyl (C2 to C4) substitutes [dialkyl (C1 to C3) aminopropylamine, trimethylhexamethylenediamine, aminoethylethanol; Min, 2,5-dimethyl-2,5-hexamethylenediamine, methyliminobispropylamine, etc.]; [3] Alicyclic or heterocyclic-containing aliphatic diamines (alicyclic diamines (C4 to C15) [1,3 -Diaminocyclohexane, isophoronediamine, mensendiamine, 4,4'-methylenedicyclohexanediamine (hydrogenated methylenedianiline), etc.], heterocyclic diamine (C4-C15) [piperazine, N-aminoethylpiperazine, 1, 4-diaminoethylpiperazine, 1,4bis (2-amino-2-methylpropyl) piperazine, 3,9-bis (3-aminopropyl) -2,4,8,10-tetraoxaspiro [5,5] [4] Aromatic ring-containing aliphatic amines (C8-C15) (xylylenediamine, tetrachloro-p-ki) Silylenediamine, etc.).

As aromatic diamines (C6-C20),
[1]: unsubstituted aromatic diamine [1,2-, 1,3- and 1,4-phenylenediamine, 2,4′- and 4,4′-diphenylmethanediamine, crude diphenylmethanediamine (polyphenylpolymethylenepolyamine ), Diaminodiphenylsulfone, benzidine, thiodianiline, bis (3,4-diaminophenyl) sulfone, 2,6-diaminopyridine, m-aminobenzylamine, triphenylmethane-4,4 ', 4 "-triamine, naphthylene diene Amines;
[2]: Aromatic diamine having a nucleus-substituted alkyl group [C1-C4 alkyl group such as methyl, ethyl, n- and i-propyl, butyl], for example, 2,4- and 2,6-tolylenediamine, crude Tolylenediamine, diethyltolylenediamine, 4,4'-diamino-3,3'-dimethyldiphenylmethane, 4,4'-bis (o-toluidine), dianisidine, diaminoditolylsulfone, 1,3-dimethyl-2 , 4-diaminobenzene, 1,3-dimethyl-2,6-diaminobenzene, 1,4-diisopropyl-2,5-diaminobenzene, 2,4-diaminomesitylene, 1-methyl-3,5-diethyl-2 , 4-diaminobenzene, 2,3-dimethyl-1,4-diaminonaphthalene, 2,6-dimethyl-1,5-diaminonaphthalene, 3, ', 5,5'-tetramethylbenzidine, 3,3', 5,5'-tetramethyl-4,4'-diaminodiphenylmethane, 3,5-diethyl-3'-methyl-2 ', 4-diaminodiphenylmethane 3,3′-diethyl-2,2′-diaminodiphenylmethane, 4,4′-diamino-3,3′-dimethyldiphenylmethane, 3,3 ′, 5,5′-tetraethyl-4,4′-diaminobenzophenone 3,3 ′, 5,5′-tetraethyl-4,4′-diaminodiphenyl ether, 3,3 ′, 5,5′-tetraisopropyl-4,4′-diaminodiphenylsulfone, and the like, and isomers thereof A mixture of various proportions of
[3]: Aromatic diamine [methylene bis-o-chloroaniline, 4-chloro-] having a nucleus-substituted electron withdrawing group (halogen such as Cl, Br, I, F; alkoxy group such as methoxy and ethoxy; nitro group, etc.) o-phenylenediamine, 2-chloro-1,4-phenylenediamine, 3-amino-4-chloroaniline, 4-bromo-1,3-phenylenediamine, 2,5-dichloro-1,4-phenylenediamine, 5 -Nitro-1,3-phenylenediamine, 3-dimethoxy-4-aminoaniline; 4,4'-diamino-3,3'-dimethyl-5,5'-dibromo-diphenylmethane, 3,3'-dichlorobenzidine, 3,3'-dimethoxybenzidine, bis (4-amino-3-chlorophenyl) oxide, bis (4-amino-2-chlorophenyl) pro Bread, bis (4-amino-2-chlorophenyl) sulfone, bis (4-amino-3-methoxyphenyl) decane, bis (4-aminophenyl) sulfide, bis (4-aminophenyl) telluride, bis (4-amino) Phenyl) selenide, bis (4-amino-3-methoxyphenyl) disulfide, 4,4′-methylenebis (2-iodoaniline), 4,4′-methylenebis (2-bromoaniline), 4,4′-methylenebis ( 2-fluoroaniline), 4-aminophenyl-2-chloroaniline and the like];
[4]: Aromatic diamine having a secondary amino group [a part or all of —NH 2 of the aromatic diamine of the above [1] to [3] is —NH—R ′ (R ′ is an alkyl group such as methyl, ethyl Etc.] [4,4′-di (methylamino) diphenylmethane, 1-methyl-2-methylamino-4-aminobenzene, etc.].

  In addition to these, the diamine component can be obtained by condensation of polyamide polyamine [dicarboxylic acid (dimer acid etc.) and excess (more than 2 mol per mole of acid) polyamine (alkylenediamine, polyalkylenepolyamine etc.). Low molecular weight polyamide polyamine, etc.], polyether polyamine [hydride of cyanoethylated polyether polyol (polyalkylene glycol, etc.), etc.].

The weight average molecular weight (Mw) of the modified crystalline polyester resin is a ratio of the weight average molecular weight (Mw) of 10,000 to 50,000 and the molecular weight of 1,000 or less in GPC measurement of the soluble part of orthodichlorobenzene. The ratio of less than 2% by mass and a molecular weight of 500 or less is preferably less than 1% by mass.
The molecular weight of the modified crystalline polyester resin can be increased, the low molecular weight component of the crystalline polyester resin can be reduced, and the high-temperature and high-humidity storage stability of the toner can be prevented from being lowered due to the compatibility with the amorphous resin.

When Mw is less than 10,000, the molecular weight of the modified crystalline polyester resin is low, and the modified crystalline polyester resin is easily compatible with the amorphous polyester resin, which may deteriorate the high temperature and high humidity storage stability. Moreover, when Mw exceeds 50000, there exists a possibility that low temperature fixability may deteriorate because compatibility with an amorphous polyester resin falls.
When the ratio of the molecular weight of 1000 or less is 2% by mass or more, the high temperature and high humidity storage stability may deteriorate due to the inclusion of many low molecular weight components that are easily compatible with the amorphous polyester.
When the ratio of the molecular weight of 500 or less is 1% by mass or more, the high temperature and high humidity storage stability may deteriorate due to the inclusion of many low molecular weight components that are easily compatible with the amorphous polyester. It is preferable that the ratio of the molecular weight of 1000 or less and the ratio of the molecular weight of 500 or less are smaller.

  The molecular weight of the modified crystalline polyester resin can be adjusted by adjusting the ratio of the acid monomer and the alcohol monomer during the reaction of the modified crystalline polyester resin, the catalyst amount during the polymerization reaction, the reaction time, the degree of vacuum, etc. In order to reduce the low molecular weight component, it is possible to bond crystalline polyesters by urethane or urea reaction.

  The maximum peak temperature (melting point) of the heat of fusion of the modified crystalline polyester resin is preferably 50 ° C. or more and less than 80 ° C., more preferably 55 ° C. to 75 ° C., from the viewpoint of achieving both low-temperature fixability and heat-resistant storage stability. 60-70 degreeC is especially preferable. When the maximum peak temperature is lower than 50 ° C., the low temperature fixability is improved but the heat resistant storage stability is deteriorated. When the maximum peak temperature is 80 ° C. or higher, the heat resistant storage stability is improved, but the low temperature fixability is deteriorated.

Furthermore, the introduction of urethane or urea group skeleton increases the melt viscosity of the crystalline polyester resin, and improves the ease of physical mixing with the amorphous polyester resin, thereby improving the low-temperature fixability.
The modified crystalline polyester resin has an increased melt viscosity of the crystalline polyester resin due to the introduction of urethane and / or urea group skeleton, and is easily mixed with the amorphous polyester resin. The storage elastic modulus G ′ at ° C. is preferably 1.0 × 10 ² Pa · s or more and less than 5.0 × 10 ⁵ Pa · s, more preferably 1.0 × 10 ³ Pa · s or more and 1 Less than 0.0 × 10 ⁵ Pa · s.

When G ′ at the melting point + 20 ° C. is less than 1.0 × 10 ² Pa · s, the difference in melt viscosity from the amorphous polyester resin near the fixing temperature increases, and the modified crystalline polyester resin and the amorphous The high-quality polyester resin is difficult to physically mix, and the low-temperature fixability may be deteriorated. Further, the strength of the modified crystalline polyester resin is low, and there is a possibility that spent and filming in the developing machine are likely to occur.

Also, if G ′ at the melting point + 20 ° C. is 5.0 × 10 ⁵ Pa · s or more, the viscosity of the modified crystalline polyester is not sufficiently lowered to be fixed, so that the low-temperature fixability may be deteriorated. is there.

  The viscoelastic properties of the modified crystalline polyester resin can be obtained by adjusting the urethane or urea group concentration in the crystalline monomer constituting the resin, the molecular weight of the resin, and the like. For example, when the urethane or urea group concentration is increased or the molecular weight is increased, the value of G ′ increases.

The acid value of the modified crystalline polyester resin is preferably 3 mgKOH / g or less, and more preferably 1 mgKOH / g or less, from the viewpoint of improving environmental resistance dependency.

  The content of the modified crystalline polyester resin in the toner can be appropriately selected according to the purpose, but is preferably 5% by mass or more and less than 20% by mass, and 7% by mass to 15% by mass is high. It is excellent in image quality, high stability, and low-temperature fixability, and is more preferable.

When the content of the modified crystalline polyester resin is less than 5% by mass, the low-temperature fixability may be inferior because sharp melting with the crystalline polyester resin is insufficient. Storage stability may deteriorate and image fogging may occur easily.

(Determination method of crystallinity)
The modified crystalline polyester resin of the present invention was crystallized by the following method.
Presence or absence of crystallinity can be confirmed by a crystal analysis X-ray diffractometer (X'Pert Pro MRD Phillips). The measurement method is described below.

First, a target sample is ground with a mortar to prepare a sample powder, and the obtained sample powder is uniformly applied to a sample holder. Thereafter, a sample holder is set in the diffractometer and measurement is performed to obtain a diffraction spectrum.
Of the peaks obtained in the range of 20 ° <2θ <25 ° in the obtained diffraction peak, the peak having the highest peak intensity was judged to have crystallinity when the peak half width was 2.0 or less. The measurement conditions for X-ray diffraction are described below.

〔Measurement condition〕
Tention kV: 45kV
Current: 40mA
MPSS
Upper
Gonio
Scannode: continuuos
Start angle: 3 °
End angle: 35 °
Angle Step: 0.02 °
Lucent beam optics
Divergence slit: Div slit 1/2
Difference beam optics
Anti scatter slit: As Fixed 1/2
Receiving slit: Prog rec slit

<Amorphous polyester resin>
As the resin used together with the modified crystalline polyester resin, an amorphous polyester resin can be used.
The amorphous polyester resin is obtained using a polyhydric alcohol component and a polyvalent carboxylic acid component such as a polyvalent carboxylic acid, a polyvalent carboxylic acid anhydride, or a polyvalent carboxylic acid ester.
In the present invention, as described above, the amorphous polyester resin uses a polyhydric alcohol component and a polyvalent carboxylic acid component such as a polyvalent carboxylic acid, a polyvalent carboxylic acid anhydride, or a polyvalent carboxylic acid ester. A polyester resin modified, for example, a prepolymer described later and a resin obtained by crosslinking and / or elongation reaction of the prepolymer do not belong to the amorphous polyester resin.

  Examples of the polyhydric alcohol component include polyoxypropylene (2.2) -2,2-bis (4-hydroxyphenyl) propane, polyoxyethylene (2.2) -2,2-bis (4-hydroxy). Alkylene) (2 to 3 carbon atoms) oxide (average number of added moles 1 to 10) adduct of bisphenol A such as phenyl) propane; ethylene glycol, propylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, hydrogenated Bisphenol A, sorbitol, or their alkylene (2 to 3 carbon atoms) oxide (average added mole number 1 to 10) adduct, etc. may be mentioned, and these may be used alone or in combination of two or more. In particular, it has a phenol skeleton with excellent charge retention performance. It is preferably an alkylene oxide adduct of bisphenol A.

  Examples of the polyvalent carboxylic acid component include dicarboxylic acids such as adipic acid, phthalic acid, isophthalic acid, terephthalic acid, fumaric acid and maleic acid; alkyl groups having 1 to 20 carbon atoms such as dodecenyl succinic acid and octyl succinic acid; Examples thereof include succinic acid substituted with an alkenyl group having 2 to 20 carbon atoms; trimellitic acid, pyromellitic acid; anhydrides of these acids and alkyl (C1 to C8) esters of these acids. These may be used individually by 1 type and may use 2 or more types together.

  It is preferable that at least a part of the amorphous polyester resin is compatible with a prepolymer described later and a resin obtained by crosslinking and / or elongation reaction of the prepolymer. When these are compatible, low-temperature fixability and high-temperature offset resistance can be improved. For this reason, the polyhydric alcohol component and polyvalent carboxylic acid component constituting the amorphous polyester resin and the polyhydric alcohol component and polycarboxylic acid component constituting the prepolymer described below may have similar compositions. preferable.

The molecular weight of the amorphous polyester resin can be appropriately selected according to the purpose, but in gel permeation chromatography (GPC) measurement, the weight average molecular weight (Mw) is 3,000 to 15,000, number average. The molecular weight (Mn) is preferably 1,000 to 5,000, Mw / Mn is preferably 1.0 to 4.0, and the weight average molecular weight (Mw) is 5,000 to 15,000, number average. The molecular weight (Mn) is preferably 1,500 to 5,000, and Mw / Mn is preferably 1.0 to 3.5.

If the molecular weight is too low, the toner may be inferior in heat resistance and durability against stress such as stirring in the developing device, and if the molecular weight is too high, the viscoelasticity at the time of melting of the toner will increase and low temperature fixability May be inferior.

  The acid value of the amorphous polyester resin can be appropriately selected according to the purpose, but is preferably 1 mgKOH / g to 50 mgKOH / g, more preferably 5 mgKOH / g to 30 mgKOH / g.

When the acid value is 1 mgKOH / g or more, the toner is likely to be negatively charged, and further, the affinity between the paper and the toner is improved when fixing to paper, and the low-temperature fixability can be improved. . When the acid value exceeds 50 mgKOH / g, the charging stability, particularly the charging stability against environmental fluctuations may be lowered.

  The hydroxyl value of the amorphous polyester resin can be appropriately selected according to the purpose, but is preferably 5 mgKOH / g or more.

  Although it can select suitably as a glass transition temperature (Tg) of the said amorphous polyester resin according to the objective, 20 to 60 degreeC is preferable and 30 to 50 degreeC is more preferable.

If the Tg is too low, the toner may be inferior in heat-resistant storage and durability against stress such as stirring in the developing device. If the Tg is too high, the viscoelasticity at the time of melting of the toner will increase and low temperature fixability May be inferior.

The content of the amorphous polyester resin is 50% by mass or more because the amorphous polyester is substantially contained as a main component in the present invention. More preferably, it is 60 mass% or more and less than 90 mass%.

  When the content is less than 50% by mass, the dispersibility of each material existing in a dispersed state inside the toner such as modified crystalline polyester, pigment, and release agent in the toner is deteriorated, and low temperature fixability, heat resistance Deterioration of storability, fogging of images, and disturbance. When the content is in the more preferable range, it is advantageous in that it is excellent in all of high image quality, high stability, low temperature fixability, and high temperature and high humidity resistance.

  The content of the amorphous polyester resin in the toner can be determined from the composition of the material used when the toner is manufactured. Further, when the material composition at the time of toner production is not clear, the content of the amorphous polyester resin in the present invention can be determined by, for example, the following method.

A toner solution is obtained by sufficiently stirring 50 parts by mass of toner and 50 parts by mass of methyl ethyl ketone with a magnetic stirrer at 23 ° C. for 1 hour. The obtained toner solution is filtered through a membrane filter, the filtrate is heated at 150 ° C. for 1 hour, and the solid content concentration in the filtrate is calculated from the change in weight before and after overheating. The solid content of the obtained filtrate can be determined as the content of the amorphous polyester resin.

  The molecular structure of the amorphous polyester resin includes NMR (Nuclear Magnetic Resonance) measurement by solution and solid, X-ray diffraction, GC / MS (Gas Chromatography Mass Spectrometer), LC / MS (Liquid Chromatography Mass Spectrometer) It can be confirmed by (Infrared Spectroscopy) measurement or the like. As a simple example, there is a method of detecting, as an amorphous polyester resin, those having no absorption based on δCH (out-of-plane variable vibration) of olefin at 965 ± 10 cm −1 and 990 ± 10 cm −1 in the infrared absorption spectrum. .

<Charge control agent>
The toner of the present invention uses a negatively chargeable charge control agent containing a polycondensate obtained by a polycondensation reaction of phenols and aldehydes as a charge control agent.

The phenols preferably include a phenol compound (A) having one phenolic hydroxyl group and a phenol compound (B) having two or more phenolic hydroxyl groups, and the phenol compound (A) and the phenol compound. In (B), the ortho position of the phenolic hydroxyl group is more preferably hydrogen.

Examples of the phenol compound (A) include p-alkylphenol, p-aralkylphenol, p-phenylphenol, and p-hydroxybenzoic acid ester. Examples of the phenol compound (B) include bisphenols and trisphenols. And tetrakisphenols.

The aldehydes are preferably paraformaldehyde and / or formaldehyde.

  As a polycondensation reaction of the phenols and aldehydes, as a reaction method, for example, phenols and aldehydes are added in an organic solvent such as xylene, and hydroxides of alkali metals and alkaline earth metals are added. In the presence of a strong base, a polycondensation reaction is carried out for 3 to 20 hours while distilling off water at a temperature from 80 ° C. to the boiling point of the solvent, preferably 100 ° C. to the boiling point of the solvent, and then a poor solvent such as alcohol is used. And a method of washing with an alcohol such as methanol, ethanol or isopropanol after drying the organic solvent under reduced pressure. As the strong base, sodium hydroxide, rubidium hydroxide, potassium hydroxide and the like can be preferably used.

Although there is no restriction | limiting in particular in the ratio of the mass of the organic solvent used here, and the mass of phenols and aldehydes, Preferably an organic solvent is 0.5-100 times the total amount of phenols and aldehydes. It is used in a range, preferably 1 to 10 times.
Moreover, the molar ratio of phenols and aldehydes used here is 1: 0.5-5, Preferably it is 1: 1-2.
The molar ratio of phenols and strong base used here is not particularly limited, but phenols: strong base = 1: 10 to 0.00001, preferably 1: 0.01 to 0.00. .

The polycondensate obtained by polycondensation reaction of phenols and aldehydes can obtain excellent chargeability by containing 0.1 to 5 parts by mass with respect to 100 parts by mass of the toner composition.

(Internally added inorganic fine particles)
In the toner of the present invention, inorganic fine particles can be internally added.
In the case of a small particle size toner having an average particle size of 6 μm or less, even if the charge amount per mass is the same, the charge amount per toner particle is small, so that the transferability tends to be deteriorated. By adding, charge acquisition performance and charge retention performance can be improved.
It is considered that the charge acquisition performance and the charge retention performance are improved by having the inorganic fine particles inside the toner particles because the charge can be injected into the toner particles.

Examples of the inorganic filler for internal use used in the present invention include silica, alumina, titanium oxide, barium titanate, magnesium titanate, calcium titanate, strontium titanate, zinc oxide, silica sand, clay (montmorillonite, or organic thereof) (Including modified products), mica, wollastonite, diatomaceous earth, chromium oxide, cerium oxide, bengara, antimony trioxide, magnesium oxide, zirconium oxide, barium sulfate, barium carbonate, calcium carbonate, silicon carbide, silicon nitride, etc. Among them, silica, silica sand, clay (including montmorillonite or an organic modified product thereof), mica, wollastonite, and diatomaceous earth are preferable. In particular, at least part of ions between layers in the layered inorganic mineral is an organic ion. Organically modified montmorillonite converted by It is preferably a layered inorganic mineral of smectite.

Further, from the viewpoint of dispersibility of the inorganic filler in the resin, it is also preferable to use an inorganic filler that has been surface-treated with a hydrophobizing agent. Examples of the hydrophobic or treating agent include silane coupling agents, silylating agents, silane coupling agents having a fluorinated alkyl group, organic titanate coupling agents, aluminum coupling agents, and the like. Further, sufficient effects can be obtained even when silicone oil is used as a hydrophobizing agent.

The dielectric constant of the inorganic fine particles is preferably 0.2 to 7.5, more preferably 1.3 to 3.5, and particularly preferably 1.7 to 2.5.
By setting the dielectric constant of the inorganic filler within this range, the amount of accumulated charge can be maintained moderately, and abnormal charge increase in a low temperature and low humidity environment can be suppressed. This can provide stable image quality.

The addition amount of the inorganic filler is preferably 0.1 to 10 parts. If the content is less than 0.1 part, the purpose of the addition is not seen, and if the content is more than 10 parts, the inorganic filler is aggregated, so that the inorganic filler cannot be uniformly dispersed, the inorganic filler is unevenly distributed, the chargeability, It becomes a deteriorating factor of fixability.

Moreover, the average diameter of the primary particle of an inorganic filler is 5-1000 nm, More preferably, it is 10-500 nm. By setting it within this range, both improvement in chargeability and pulverization of the toner can be achieved. If the thickness is smaller than 5 nm, the inorganic filler aggregates, the inorganic filler is not uniformly dispersed in the toner particles, and the charging uniformity is lost. When it is larger than 1 μm, it is necessary to contain a large amount of an inorganic filler in order to obtain an additive effect.

The average particle size here is the number average particle size and is measured with a particle size distribution measuring device that uses dynamic light scattering, such as DSL-700 manufactured by Otsuka Electronics Co., Ltd. or Coulter N4 manufactured by Coulter Electronics. Is possible. When it is difficult to deviate from the secondary aggregation, it is also possible to directly determine the particle diameter from a photograph obtained by a transmission electron microscope. In this case, at least 100 particles are observed and the average of the major axis is observed. It is preferable to use a value. These inorganic fillers may be used alone or in combination of two or more.

<Colorant>
The colorant can be appropriately selected depending on the purpose. For example, carbon black, nigrosine dye, iron black, naphthol yellow S, Hansa yellow (10G, 5G, G), cadmium yellow, yellow iron oxide, Ocher, yellow lead, titanium yellow, polyazo yellow, oil yellow, Hansa yellow (GR, A, RN, R), pigment yellow L, benzidine yellow (G, GR), permanent yellow (NCG), Vulcan fast yellow (5G) , R), Tartrazine Lake, Quinoline Yellow Lake, Anthrazan Yellow BGL, Isoindolinone Yellow, Bengala, Red Dan, Lead Zhu, Cadmium Red, Cadmium Mercury Red, Antimon Zhu, Permanent Red 4R, Para Red, Faise red, parachlor ortho Troaniline Red, Resol Fast Scarlet G, Brilliant Fast Scarlet, Brilliant Carmine B, Permanent Red (F2R, F4R, FRL, FRLL, F4RH), Fast Scarlet VD, Belkan Fast Rubin B, Brilliant Scarlet G, Resol Rubin GX, Permanent Red F5R, Brilliant Carmine 6B, Pigment Scarlet 3B, Bordeaux 5B, Toulouse Maroon, Permanent Bordeaux F2K, Helio Bordeaux BL, Bordeaux 10B, Bon Maroon Light, Bon Maroon Medium, Eosin Lake, Rhodamine Lake B, Rhodamine Lake Y, Alizarin Lake, Thioindigo red B, thioindigo maroon, oil red, quinacridone red, pyrazolone , Polyazo Red, Chrome Vermillion, Benzidine Orange, Perinone Orange, Oil Orange, Cobalt Blue, Cerulean Blue, Alkaline Blue Lake, Peacock Blue Lake, Victoria Blue Lake, Metal Free Phthalocyanine Blue, Phthalocyanine Blue, Fast Sky Blue, Indance Ren Blue (RS, BC), Indigo, Ultramarine Blue, Bitumen, Anthraquinone Blue, Fast Violet B, Methyl Violet Lake, Cobalt Purple, Manganese Purple, Dioxane Violet, Anthraquinone Violet, Chrome Green, Zinc Green, Chrome Oxide, Pyridian, Emerald Green , Pigment Green B, Naphthol Green B, Green Gold, Acid Green Lake, Malachite Green Lake, Examples include phthalocyanine green, anthraquinone green, titanium oxide, zinc white, and lithopone.

  The content of the colorant can be appropriately selected according to the purpose, but is preferably 1% by mass to 15% by mass in the toner, and more preferably 3% by mass to 10% by mass.

  The colorant can be used as it is together with other toner raw materials, but can also be used as a master batch combined with a resin.

Examples of the resin to be kneaded together with the production of the master batch or the master batch include, in addition to the amorphous polyester resin, a polymer of styrene such as polystyrene, poly p-chlorostyrene, polyvinyl toluene, or a substituted product thereof; styrene-p -Chlorostyrene copolymer, styrene-propylene copolymer, styrene-vinyltoluene copolymer, styrene-vinylnaphthalene copolymer, styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene- Butyl acrylate copolymer, styrene-octyl acrylate copolymer, styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-butyl methacrylate copolymer, styrene-α-chloromethacrylic acid Methyl copolymer, styrene-acrylo Tolyl copolymer, styrene-vinyl methyl ketone copolymer, styrene-butadiene copolymer, styrene-isoprene copolymer, styrene-acrylonitrile-indene copolymer, styrene-maleic acid copolymer, styrene-maleic acid ester Styrene copolymers such as copolymers; polymethyl methacrylate, polybutyl methacrylate, polyvinyl chloride, polyvinyl acetate, polyethylene, polypropylene, polyester, epoxy resin, epoxy polyol resin, polyurethane, polyamide, polyvinyl butyral, polyacrylic acid Examples thereof include resins, rosins, modified rosins, terpene resins, aliphatic or alicyclic hydrocarbon resins, aromatic petroleum resins, chlorinated paraffins, and paraffin waxes. These may be used individually by 1 type and may use 2 or more types together.

  The masterbatch can be obtained by mixing and kneading a masterbatch resin and a colorant under high shearing force. At this time, an organic solvent can be used in order to enhance the interaction between the colorant and the resin. In addition, a so-called flushing method, which is a wet method of colorant, is a method of mixing and kneading an aqueous paste containing water of a colorant together with a resin and an organic solvent, transferring the colorant to the resin side, and removing moisture and organic solvent components. Since the cake can be used as it is, it does not need to be dried and is preferably used. For mixing and kneading, a high shear dispersion device such as a three-roll mill is preferably used.

<Other ingredients>
The other components can be appropriately selected according to the purpose. For example, a polymer having a site capable of reacting with an active hydrogen group-containing compound, an active hydrogen group-containing compound, a release agent, a charge control agent, an external Examples thereof include additives, fluidity improvers, cleaning improvers, and magnetic materials.

(Polymer having a site capable of reacting with an active hydrogen group-containing compound)
The polymer having a site capable of reacting with the active hydrogen group-containing compound (sometimes referred to as a “prepolymer”) can be appropriately selected according to the purpose. For example, a polyol resin, a polyacrylic resin, Examples thereof include polyester resins, epoxy resins, and derivatives thereof. These may be used individually by 1 type and may use 2 or more types together.

Among these, a polyester resin is preferable in terms of high fluidity and transparency at the time of melting.
Examples of the site capable of reacting with the active hydrogen group-containing compound of the prepolymer include an isocyanate group, an epoxy group, a carboxyl group, and a functional group represented by -COCl. These may be used individually by 1 type and may use 2 or more types together.
Among these, an isocyanate group is preferable.

  The prepolymer can be appropriately selected according to the purpose, but it is easy to adjust the molecular weight of the polymer component, and oilless low-temperature fixing characteristics in dry toner, in particular, a release oil application mechanism to a fixing heating medium Even in the case where there is no polyester, a polyester resin having an isocyanate group or the like capable of generating a urea bond is preferable in terms of securing good release properties and fixing properties.

  The polyester resin containing an isocyanate group (hereinafter, sometimes referred to as “polyester prepolymer having an isocyanate group”) can be appropriately selected according to the purpose. For example, a polyol and a polycarboxylic acid are combined. Examples thereof include a reaction product of a polyester resin having an active hydrogen group obtained by condensation and a polyisocyanate.

The polyol can be appropriately selected according to the purpose, and examples thereof include diol, trihydric or higher alcohol, a mixture of diol and trihydric or higher alcohol, and the like. These may be used individually by 1 type and may use 2 or more types together.
Among these, diol, and a mixture of diol and a small amount of trihydric or higher alcohol are preferable.

The diol can be appropriately selected depending on the purpose, and examples thereof include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4-butanediol, 1,6-hexanediol, and the like. Alkylene glycol; diol having an oxyalkylene group such as diethylene glycol, triethylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol and polytetramethylene glycol; alicyclic diol such as 1,4-cyclohexanedimethanol and hydrogenated bisphenol A ; Alicyclic diol with addition of alkylene oxide such as ethylene oxide, propylene oxide, butylene oxide; bisphenol such as bisphenol A, bisphenol F, bisphenol S The bisphenols include ethylene oxide, propylene oxide, alkylene oxide adducts of bisphenols such as those obtained by adding alkylene oxides such as butylene oxide; s and the like. In addition, as carbon number of the said alkylene glycol, although it can select suitably according to the objective, 2-12 are preferable.
Among these, alkylene glycols having 2 to 12 carbon atoms and alkylene oxide adducts of bisphenols are preferable, alkylene oxide adducts of bisphenols, alkylene oxide adducts of bisphenols and alkylene glycols having 2 to 12 carbon atoms. And a mixture thereof is more preferable.

  The trihydric or higher alcohol can be appropriately selected depending on the purpose, and examples thereof include trihydric or higher aliphatic alcohols, trihydric or higher polyphenols, and alkylene oxide adducts of trihydric or higher polyphenols. Is mentioned.

  The trihydric or higher aliphatic alcohol can be appropriately selected depending on the purpose, and examples thereof include glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, and sorbitol.

  The trihydric or higher polyphenols can be appropriately selected according to the purpose, and examples thereof include trisphenol PA, phenol novolak, cresol novolak, and the like.

  Examples of the alkylene oxide adducts of trihydric or higher polyphenols include those obtained by adding alkylene oxides such as ethylene oxide, propylene oxide, and butylene oxide to trihydric or higher polyphenols.

  When the diol and the trihydric or higher alcohol are mixed and used, the mass ratio of the trihydric or higher alcohol to the diol can be appropriately selected according to the purpose, but is 0.01 mass% to 10 mass%. Is preferable, and 0.01% by mass to 1% by mass is more preferable.

The polycarboxylic acid can be appropriately selected depending on the purpose, and examples thereof include dicarboxylic acids, trivalent or higher carboxylic acids, and mixtures of dicarboxylic acids and trivalent or higher carboxylic acids. These may be used individually by 1 type and may use 2 or more types together.
Among these, a dicarboxylic acid, a mixture of a dicarboxylic acid and a small amount of a tricarboxylic or higher polycarboxylic acid is preferable.

  The dicarboxylic acid can be appropriately selected depending on the purpose, and examples thereof include divalent alkanoic acids, divalent alkenoic acids, and aromatic dicarboxylic acids.

  The divalent alkanoic acid can be appropriately selected according to the purpose, and examples thereof include succinic acid, adipic acid, and sebacic acid.

  The divalent alkenoic acid can be appropriately selected according to the purpose, but a divalent alkenoic acid having 4 to 20 carbon atoms is preferable. As said C4-C20 bivalent alkenoic acid, it can select suitably according to the objective, For example, a maleic acid, a fumaric acid, etc. are mentioned.

  Although it can select suitably as said aromatic dicarboxylic acid according to the objective, C8-C20 aromatic dicarboxylic acid is preferable. As said C8-C20 aromatic dicarboxylic acid, it can select suitably according to the objective, For example, a phthalic acid, isophthalic acid, a terephthalic acid, naphthalene dicarboxylic acid etc. are mentioned.

The trivalent or higher carboxylic acid can be appropriately selected according to the purpose, and examples thereof include a trivalent or higher aromatic carboxylic acid.
Although it can select suitably as said trivalent or more aromatic carboxylic acid according to the objective, C9-C20 trivalent or more aromatic carboxylic acid is preferable. The trivalent or higher aromatic carboxylic acid having 9 to 20 carbon atoms can be appropriately selected according to the purpose, and examples thereof include trimellitic acid and pyromellitic acid.

  As the polycarboxylic acid, an acid anhydride or a lower alkyl ester of any of dicarboxylic acid, trivalent or higher carboxylic acid, and a mixture of dicarboxylic acid and trivalent or higher carboxylic acid may be used.

  The lower alkyl ester can be appropriately selected depending on the purpose, and examples thereof include methyl ester, ethyl ester, isopropyl ester, and the like.

  When the dicarboxylic acid and the trivalent or higher carboxylic acid are used in combination, the mass ratio of the trivalent or higher carboxylic acid to the dicarboxylic acid can be appropriately selected according to the purpose, but is 0.01 mass. % To 10% by mass is preferable, and 0.01% to 1% by mass is more preferable.

  When the polycondensation of the polyol and the polycarboxylic acid, the equivalent ratio of the hydroxyl group of the polyol to the carboxyl group of the polycarboxylic acid can be appropriately selected according to the purpose, preferably 1-2. 1-1.5 are more preferable and 1.02-1.3 are especially preferable.

  As content of the structural unit derived from the polyol in the polyester prepolymer which has the said isocyanate group, although it can select suitably according to the objective, 0.5 mass%-40 mass% are preferable, and 1 mass%-30 % By mass is more preferable, and 2% by mass to 20% by mass is particularly preferable.

  When the content is less than 0.5% by mass, the high temperature offset resistance is lowered, and it may be difficult to achieve both the heat resistant storage stability and the low temperature fixability of the toner. When the content exceeds 40% by mass, Low temperature fixability may be reduced.

  The polyisocyanate can be appropriately selected according to the purpose. For example, aliphatic diisocyanate, alicyclic diisocyanate, aromatic diisocyanate, araliphatic diisocyanate, isocyanurates, these are phenol derivatives, oximes, caprolactam, etc. Or something that was blocked with. The aliphatic diisocyanate can be appropriately selected according to the purpose. For example, tetramethylene diisocyanate, hexamethylene diisocyanate, methyl 2,6-diisocyanatocaproate, octamethylene diisocyanate, decamethylene diisocyanate, dodecamethylene diisocyanate. , Tetradecamethylene diisocyanate, trimethylhexane diisocyanate, tetramethylhexane diisocyanate, and the like.

  As said alicyclic diisocyanate, it can select suitably according to the objective, For example, isophorone diisocyanate, cyclohexylmethane diisocyanate, etc. are mentioned.

  The aromatic diisocyanate can be appropriately selected according to the purpose. For example, tolylene diisocyanate, diisocyanatodiphenylmethane, 1,5-naphthylene diisocyanate, 4,4′-diisocyanatodiphenyl, 4,4 Examples include '-diisocyanato-3,3'-dimethyldiphenyl, 4,4'-diisocyanato-3-methyldiphenylmethane, 4,4'-diisocyanato-diphenyl ether, and the like.

  The araliphatic diisocyanate can be appropriately selected depending on the purpose, and examples thereof include α, α, α ′, α′-tetramethylxylylene diisocyanate.

  The isocyanurates can be appropriately selected according to the purpose, and examples thereof include tris (isocyanatoalkyl) isocyanurate, tris (isocyanatocycloalkyl) isocyanurate, and the like. These may be used individually by 1 type and may use 2 or more types together.

  When the polyisocyanate and the polyester resin having a hydroxyl group are reacted, the equivalent ratio of the isocyanate group of the polyisocyanate to the hydroxyl group of the polyester resin can be appropriately selected according to the purpose, but 1 to 5 is preferable. 1.2 to 4 is more preferable, and 1.5 to 3 is particularly preferable. When the equivalent ratio is less than 1, offset resistance may be lowered. When the equivalent ratio is more than 5, low-temperature fixability may be lowered.

  As content of the structural unit derived from polyisocyanate in the polyester prepolymer which has the said isocyanate group, although it can select suitably according to the objective, 0.5 mass%-40 mass% are preferable, and 1-30 mass % Is more preferable, and 2 to 20% by mass is particularly preferable. When the content is less than 0.5% by mass, the high temperature offset resistance may be deteriorated, and when it exceeds 40% by mass, the low temperature fixability may be deteriorated.

  The average number of isocyanate groups that the polyester prepolymer having an isocyanate group has per molecule can be appropriately selected according to the purpose, but is preferably 1 or more, more preferably 1.2 to 5, and more preferably 1. 5-4 are especially preferable. When the average number is less than 1, the molecular weight of the urea-modified polyester resin is lowered, and the high temperature offset resistance may be lowered.

  The mass ratio of the polyester prepolymer having an isocyanate group to the total mass of the toner can be appropriately selected according to the purpose, but is preferably 5/95 to 25/75, and 10/90 to 25/75. More preferred. When the mass ratio is less than 5/95, the high temperature offset resistance may be lowered, and when it exceeds 25/75, the low temperature fixability and the glossiness of the image may be lowered.

  The active hydrogen group-containing compound acts as an elongation agent, a crosslinking agent or the like when a polymer having a site capable of reacting with the active hydrogen group-containing compound undergoes an elongation reaction, a crosslinking reaction, or the like in an aqueous medium.

  The active hydrogen group can be appropriately selected depending on the purpose, and examples thereof include a hydroxyl group (alcoholic hydroxyl group and phenolic hydroxyl group), an amino group, a carboxyl group, a mercapto group, and the like. These may be used individually by 1 type and may use 2 or more types together.

  The active hydrogen group-containing compound can be appropriately selected depending on the purpose, but when the polymer having a site capable of reacting with the active hydrogen group-containing compound is a polyester resin containing an isocyanate group, Amines are preferred in that they can be polymerized with the polyester resin by elongation reaction, crosslinking reaction, or the like.

The amines can be appropriately selected depending on the purpose, and examples thereof include diamines, trivalent or higher amines, amino alcohols, amino mercaptans, amino acids, and those obtained by blocking these amino groups. These may be used individually by 1 type and may use 2 or more types together.
Among these, diamine and a mixture of a diamine and a small amount of trivalent or higher amine are preferable.

  As said diamine, it can select suitably according to the objective, For example, aromatic diamine, alicyclic diamine, aliphatic diamine, etc. are mentioned. The aromatic diamine can be appropriately selected depending on the purpose, and examples thereof include phenylenediamine, diethyltoluenediamine, 4,4'-diaminodiphenylmethane, and the like. The alicyclic diamine can be appropriately selected depending on the purpose, and examples thereof include 4,4'-diamino-3,3'-dimethyldicyclohexylmethane, diaminocyclohexane, isophorone diamine, and the like. As said aliphatic diamine, it can select suitably according to the objective, For example, ethylenediamine, tetramethylenediamine, hexamethylenediamine, etc. are mentioned.

  The trivalent or higher amine can be appropriately selected depending on the purpose, and examples thereof include diethylenetriamine and triethylenetetramine.

  As said amino alcohol, it can select suitably according to the objective, For example, ethanolamine, hydroxyethyl aniline, etc. are mentioned.

  The amino mercaptan can be appropriately selected depending on the purpose, and examples thereof include aminoethyl mercaptan and aminopropyl mercaptan.

The amino acid can be appropriately selected depending on the purpose, and examples thereof include aminopropionic acid and aminocaproic acid.
The amino group blocked can be appropriately selected according to the purpose, for example, a ketimine compound or an oxazolidone compound obtained by blocking an amino group with a ketone such as acetone, methyl ethyl ketone, or methyl isobutyl ketone. , Etc.

<Release agent>
The release agent can be appropriately selected from known ones.
Examples of mold release agents for waxes and waxes include plant waxes such as carnauba wax, cotton wax, wood wax, and rice wax; animal waxes such as beeswax and lanolin; mineral waxes such as ozokerite and cercin; And natural waxes such as petroleum waxes such as paraffin, microcrystalline, and petrolatum.

In addition to these natural waxes, synthetic hydrocarbon waxes such as Fischer-Tropsch wax, polyethylene, and polypropylene; synthetic waxes such as esters, ketones, and ethers;

  Furthermore, fatty acid amide compounds such as 12-hydroxystearic acid amide, stearic acid amide, phthalic anhydride imide, and chlorinated hydrocarbons; low molecular weight crystalline polymer resin, poly-n-stearyl methacrylate, poly-n -Polyacrylate homopolymer or copolymer such as lauryl methacrylate (eg, n-stearyl acrylate-ethyl methacrylate copolymer); crystalline polymer having a long alkyl group in the side chain, etc. Good.

  Among these, hydrocarbon waxes such as paraffin wax, microcrystalline wax, Fischer-Tropsch wax, polyethylene wax, and polypropylene wax are preferable. In particular, the hydrocarbon wax has almost no compatibility with the crystalline polyester resin. Since they can function independently from each other, the softening effect of the crystalline polyester resin as a binder resin and the offset property of the release agent are not impaired, which is preferable.

The melting point of the release agent can be appropriately selected according to the purpose, but is preferably 60 ° C. or higher and lower than 95 ° C. Since such a release agent can effectively act as a release agent between the fixing roller and the toner interface, high temperature offset resistance can be achieved without applying a release agent such as oil to the fixing roller. Can be improved.
When the melting point of the release agent is less than 60 ° C., the release agent is easily melted at a low temperature, and the heat resistant storage stability of the toner may be deteriorated. If the melting point of the release agent is 95 ° C. or more, the release agent may not be sufficiently melted by heating at the time of fixing, and sufficient offset properties may not be obtained.
The content of the release agent can be appropriately selected according to the purpose, but is preferably 2% by mass to 10% by mass in the toner, and more preferably 3% by mass to 8% by mass. When the content is less than 2% by mass, the high-temperature offset resistance during fixing and the low-temperature fixability may be inferior. When the content exceeds 10% by mass, the heat-resistant storage stability is deteriorated, and image fogging occurs. Etc. may occur easily. When the content is in the more preferable range, it is advantageous in terms of improving the image quality and improving the fixing stability.

<External additive>
As the external additive, in addition to oxide fine particles, inorganic fine particles or hydrophobic treated inorganic fine particles can be used in combination, but the average particle size of the primary particles of the hydrophobic treated inorganic fine particles is preferably 1 nm to 100 nm, 5 nm to 70 nm is more preferable.
Further, it is preferable that at least one kind of inorganic fine particles having an average particle diameter of 20 nm or less of the hydrophobized primary particles and at least one kind of inorganic fine particles having an average particle diameter of the primary particles of 30 nm or more.
In addition, the specific surface area by BET method ^is preferably 20m ² / g~500m 2 / g.

  The external additive can be appropriately selected depending on the purpose, and examples thereof include inorganic fine particles, fatty acid metal salts (for example, zinc stearate, aluminum stearate, etc.), fluoropolymers, and the like.

  Examples of the inorganic fine particles include silica, alumina, titanium oxide, barium titanate, magnesium titanate, calcium titanate, strontium titanate, iron oxide, copper oxide, zinc oxide, tin oxide, silica sand, clay, mica, silica Examples include apatite, diatomaceous earth, chromium oxide, cerium oxide, bengara, antimony trioxide, magnesium oxide, zirconium oxide, parium sulfate, barium carbonate, calcium carbonate, silicon carbide, and silicon nitride. Among these, hydrophobic silica, titania, titanium oxide, and alumina fine particles are preferable.

  Examples of the silica fine particles include R972, R974, RX200, RY200, R202, R805, and R812 (all manufactured by Nippon Aerosil Co., Ltd.).

  Moreover, as titania fine particles, for example, P-25 (manufactured by Nippon Aerosil Co., Ltd.), STT-30, STT-65C-S (both manufactured by Titanium Industry Co., Ltd.), TAF-140 (manufactured by Fuji Titanium Industry Co., Ltd.), MT-150W, MT-500B, MT-600B, MT-150A (all of which are manufactured by Teika Corporation), and the like.

  Examples of the hydrophobized titanium oxide fine particles include T-805 (manufactured by Nippon Aerosil Co., Ltd.), STT-30A, STT-65S-S (all manufactured by Titanium Industry Co., Ltd.), TAF-500T, and TAF-1500T. (Both manufactured by Fuji Titanium Industry Co., Ltd.), MT-100S, MT-100T (all manufactured by Teika Co., Ltd.), IT-S (manufactured by Ishihara Sangyo Co., Ltd.), and the like.

  In order to obtain hydrophobized oxide microparticles, hydrophobized silica microparticles, hydrophobized titania microparticles, and hydrophobized alumina microparticles, hydrophilic microparticles can be obtained using methyltrimethoxysilane or methyltrimethylsilane. It can be obtained by treating with a silane coupling agent such as ethoxysilane or octyltrimethoxysilane. In addition, silicone oil-treated oxide fine particles and inorganic fine particles obtained by treating silicone oil with heat if necessary to treat it with inorganic fine particles are also suitable.

  Examples of the silicone oil include dimethyl silicone oil, methylphenyl silicone oil, chlorophenyl silicone oil, methyl hydrogen silicone oil, alkyl-modified silicone oil, fluorine-modified silicone oil, polyether-modified silicone oil, alcohol-modified silicone oil, amino-modified. Silicone oil, epoxy-modified silicone oil, epoxy-polyether-modified silicone oil, phenol-modified silicone oil, carboxyl-modified silicone oil, mercapto-modified silicone oil, acrylic, methacryl-modified silicone oil, α-methylstyrene-modified silicone oil and the like can be used.

  The content of the external additive can be appropriately selected depending on the purpose, but the toner base particles (the toner to which the external additive or further the charge control agent is not added, will be referred to similarly below). ) To 0.1% by mass to 5% by mass, and more preferably 0.3% to 3% by mass.

(Fluidity improver)
The fluidity improver can be appropriately selected according to the purpose as long as it is surface-treated to increase hydrophobicity and prevent deterioration of flow characteristics and charging characteristics even under high humidity. For example, silane coupling agents, silylating agents, silane coupling agents having a fluorinated alkyl group, organic titanate coupling agents, aluminum coupling agents, silicone oils, modified silicone oils, and the like can be given. It is particularly preferable that the silica and the titanium oxide are surface-treated with such a fluidity improver and used as hydrophobic silica and hydrophobic titanium oxide.

(Cleaning improver)
The cleaning property improver is appropriately selected according to the purpose as long as it is added to the toner in order to remove the developer after transfer remaining on the photosensitive member or the primary transfer medium (so-called intermediate transfer belt). Examples thereof include fatty acid metal salts such as zinc stearate, calcium stearate and stearic acid, polymer fine particles produced by soap-free emulsion polymerization such as polymethyl methacrylate fine particles and polystyrene fine particles. The polymer fine particles preferably have a relatively narrow particle size distribution, and those having a volume average particle size of 0.01 μm to 1 μm are suitable.

(Magnetic material)
As said magnetic material, it can select suitably according to the objective, For example, iron powder, a magnetite, a ferrite, etc. are mentioned. Among these, white is preferable in terms of color tone.

<Toner characteristics>
(Acid value)
The acid value of the toner can be appropriately selected according to the purpose, but is 0.5 mg KOH / g to 40 mg KOH / g from the viewpoint of controlling low temperature fixability (fixing lower limit temperature), hot offset occurrence temperature, and the like. Preferably there is. When the acid value is less than 0.5 mg KOH / g, the effect of improving the dispersion stability by the base during production cannot be obtained, or when the prepolymer is used, an extension reaction and / or a crosslinking reaction proceeds. Manufacturing stability may be reduced. When the acid value exceeds 40 mgKOH / g, when the prepolymer is used, the extension reaction and / or the crosslinking reaction may be insufficient, and the high temperature offset resistance may be lowered.

(Glass transition temperature (Tg))
The glass transition temperature (Tg) of the toner can be appropriately selected according to the purpose, but the glass transition temperature (Tg1st) calculated at the first temperature increase in differential scanning calorimetry (DSC) is 20 ° C. The temperature is preferably less than 60 ° C. and more preferably 30 ° C. or more and 50 ° C. or less. Thereby, low temperature fixability, heat resistant storage stability and high durability can be obtained. If the Tg1st is less than 20 ° C., blocking in the developing machine or filming on the photoreceptor may occur, and if it is 60 ° C. or more, the low-temperature fixability may be deteriorated.

  The glass transition temperature (Tg2nd) calculated at the second temperature increase in the differential scanning calorimetry (DSC) of the toner is preferably 10 ° C. or higher and lower than 30 ° C. If the Tg2nd is less than 10 ° C., the image blocking property of the printed matter may be deteriorated, blocking in the developing machine or filming on the photoreceptor may occur, and if it is 30 ° C. or more, the low-temperature fixability is deteriorated. Sometimes.

Further, it is preferable that the difference between the glass transition temperature Tg1st at the first temperature increase of the toner and the glass transition temperature Tg2nd at the second temperature increase is 10 ° C. or more and less than 30 ° C. If the difference between Tg1st and Tg2nd is less than 10 ° C., the softening effect of the crystalline polyester on the amorphous polyester is low, and the low-temperature fixability may not be sufficiently exhibited. Further, if the difference between Tg1st and Tg2nd is 30 ° C. or more, the crystalline polyester becomes difficult to recrystallize after fixing, and the blocking property of the printed matter may deteriorate.
The details of the glass transition temperature (Tg1st) calculated at the first temperature increase and the glass transition temperature (Tg2nd) calculated at the second temperature increase in differential scanning calorimetry will be described later.

(Volume average particle size)
The volume average particle diameter of the toner can be appropriately selected according to the purpose, but is preferably a small particle diameter from the viewpoint of image quality, and is preferably 4 μm or more and 6 μm or less.
The ratio of the volume average particle diameter to the number average particle diameter is preferably 1.2 or less. Further, it is preferable to contain 1% by number or more and 10% by number or less of a component having a volume average particle diameter of 2 μm or less.

<Measurement method>
(Measurement method of gel permeation chromatography)
The weight average molecular weight (Mw) and number average molecular weight (Mn) of the modified crystalline polyester resin and the amorphous polyester resin by gel permeation chromatography measurement can be measured by the following means, for example.

〔Measurement condition〕
Gel permeation chromatography (GPC) measuring device: GPC-8220 GPC (manufactured by Tosoh Corporation)
・ Column: TSKgel SuperHZM-H 15cm triple (manufactured by Tosoh Corporation)
・ Temperature: 40 ℃
・ Solvent: Orthodichlorobenzene ・ Flow rate: 0.35 ml / min
Sample: 0.4 ml of 0.15% sample was injected. Sample pretreatment: The target sample was dissolved in orthodichlorobenzene at 0.15 wt% and then filtered through a 0.2 μm filter, and the filtrate was used as a sample. 100 μl of the sample solution is injected and measured.

  In measuring the molecular weight of a sample, the molecular weight distribution of the sample is calculated from the relationship between the logarithmic value of a calibration curve prepared from several types of monodisperse polystyrene standard samples and the number of counts. As a standard polystyrene sample for preparing a calibration curve, Showd STANDARD Std. No S-7300, S-210, S-390, S-875, S-1980, S-10.9, S-629, S-3.0, S-0.580 were used. An RI (refractive index) detector was used as the detector.

(Measurement method of viscoelasticity)
The dynamic viscoelastic characteristic values (storage elastic modulus G ′, loss elastic modulus G ″) of the resin and the toner can be measured using a dynamic viscoelasticity measuring apparatus (for example, ARES (manufactured by TA Instruments)). .
Specifically, the sample was formed into a pellet having a diameter of 8 mm and a thickness of 1 mm to 2 mm, fixed to a parallel plate having a diameter of 8 mm, stabilized at 40 ° C., a frequency of 1 Hz (6.28 rad / s), and a strain amount of 0. The temperature was increased to 200 ° C. at a rate of temperature increase of 2.0 ° C./min at 1% (strain amount control mode).

(Method for measuring acid value and hydroxyl value)
The hydroxyl value can be measured using a method based on JIS K0070-1966.
Specifically, first, 0.5 g of a sample is precisely weighed into a 100 mL volumetric flask, and 5 mL of an acetylating reagent is added thereto. Next, after heating in a 100 ± 5 ° C. warm bath for 1 to 2 hours, the flask is removed from the warm bath and allowed to cool. Furthermore, acetic anhydride is decomposed by adding water and shaking. Next, in order to completely decompose acetic anhydride, the flask is again heated in a warm bath for 10 minutes or more and allowed to cool, and then the wall of the flask is thoroughly washed with an organic solvent.
Furthermore, the hydroxyl value was measured at 23 ° C. using an automatic potentiometric titrator DL-53 Titrator (manufactured by METTLER TOLEDO) and electrode DG113-SC (manufactured by METTLER TOLEDO), and analysis software LabX Light Version 1.00 Analyze using .000. For calibration of the apparatus, a mixed solvent of 120 mL of toluene and 30 mL of ethanol is used.
At this time, the measurement conditions are as follows.
〔Measurement condition〕
Still
Speed [%] 25
Time [s] 15
EQP titration
Titrant / Sensor
Titrant CH3ONa
Concentration [mol / L] 0.1
Sensor DG115
Unit of measurement mV
Predispensing to volume
Volume [mL] 1.0
Wait time [s] 0
Titrant addition Dynamic
dE (set) [mV] 8.0
dV (min) [mL] 0.03
dV (max) [mL] 0.5
Measurement mode Equilibrium controlled
dE [mV] 0.5
dt [s] 1.0
t (min) [s] 2.0
t (max) [s] 20.0
Recognition
Threshold 100.0
Steppes jump only No
Range No
Tendency None
Termination
at maximum volume [mL] 10.0
at potential No
at slope No
after number EQPs Yes
n = 1
comb. termination conditions No
Evaluation
Procedure Standard
Potential1 No
Potentialial No
Stop for revaluation No

The acid value can be measured using a method based on JIS K0070-1992.
Specifically, first, 0.5 g of a sample (0.3 g in the case of an ethyl acetate-soluble component) is added to 120 mL of toluene and dissolved by stirring at 23 ° C. for about 10 hours. Next, 30 mL of ethanol is added to prepare a sample solution. When the sample does not dissolve, a solvent such as dioxane or tetrahydrofuran is used. Furthermore, an acid value was measured at 23 ° C. using an automatic potentiometric titrator DL-53 Titator (manufactured by METTLER TOLEDO) and electrode DG113-SC (manufactured by METTLER TOLEDO), and analysis software LabX Light Version 1.00 Analyze using .000. For calibration of the apparatus, a mixed solvent of 120 mL of toluene and 30 mL of ethanol is used.
At this time, the measurement conditions are the same as in the case of the hydroxyl value described above.
The acid value can be measured as described above. Specifically, titration is performed with a 0.1N potassium hydroxide / alcohol solution standardized in advance, and the acid value [mg KOH / g] = The acid value is calculated by titration [mL] × N × 56.1 [mg / mL] / sample mass [g] (where N is a factor of 0.1 N potassium hydroxide / alcohol solution).

(Measuring method of melting point and glass transition temperature (Tg))
The toner and the melting point and glass transition temperature (Tg) of each material in the present invention can be measured using, for example, a DSC system (differential scanning calorimeter) (“DSC-60”, manufactured by Shimadzu Corporation).

Specifically, the exothermic peak temperature, melting point, and glass transition temperature of the target sample can be measured by the following procedure.
First, about 5.0 mg of a target sample is placed in an aluminum sample container, and the sample container is placed on a holder unit and set in an electric furnace. Next, heating is performed from 0 ° C. to 150 ° C. at a heating rate of 10 ° C./min in a nitrogen atmosphere. Thereafter, the temperature is lowered from 150 ° C. to 0 ° C. at a temperature drop rate of 10 ° C./min, and further heated to 150 ° C. at a temperature rise rate of 10 ° C./min, and a differential scanning calorimeter (“DSC-60”, manufactured by Shimadzu Corporation) ) To measure the DSC curve.

  From the obtained DSC curve, using the analysis program “endothermic shoulder temperature” in the DSC-60 system, the DSC curve at the first temperature rise is selected, and the glass transition temperature at the first temperature rise of the target sample is obtained. Can do. Further, by using the “endothermic shoulder temperature”, a DSC curve at the second temperature rise can be selected, and the glass transition temperature at the second temperature rise of the target sample can be obtained.

  Also, from the obtained DSC curve, using the analysis program “endothermic peak temperature” in the DSC-60 system, the DSC curve at the first temperature increase is selected, and the melting point at the first temperature increase of the target sample is obtained. Can do. Further, by using the “endothermic peak temperature”, a DSC curve at the second temperature rise can be selected, and the melting point at the second temperature rise of the target sample can be obtained.

In the present invention, the glass transition temperature at the first temperature rise when the toner is used as the target sample is Tg1st, and the glass transition temperature at the second temperature rise is Tg2nd.
Moreover, in this invention, melting | fusing point and Tg at the time of the 2nd temperature rise of each structural component are made into melting | fusing point and Tg of each object sample.

(Measuring method of particle size distribution)
For the volume average particle diameter (D4) and number average particle diameter (Dn) of the toner, the ratio (D4 / Dn) is, for example, Coulter Counter TA-II, Coulter Multisizer II (both manufactured by Coulter Co., Ltd.), etc. Can be measured. In the present invention, Coulter Multisizer II is used as a measuring device. The measurement method is described below.

  First, 0.1 mL to 5 mL of a surfactant (preferably polyoxyethylene alkyl ether (nonionic surfactant)) as a dispersant is added to 100 mL to 150 mL of the electrolytic aqueous solution. Here, the electrolytic aqueous solution is a 1 mass% NaCl aqueous solution prepared using primary sodium chloride, and for example, ISOTON-II (manufactured by Coulter) can be used. Here, 2 mg to 20 mg of a measurement sample is further added. The electrolytic aqueous solution in which the sample is suspended is subjected to a dispersion treatment with an ultrasonic disperser for about 1 to 3 minutes, and the measurement device is used to measure the volume and number of toner particles or toner using a 100 μm aperture as the aperture. Calculate volume distribution and number distribution. From the obtained distribution, the volume average particle diameter (D4) and the number average particle diameter (Dn) of the toner can be obtained.

  As a channel, it is 2.00 micrometers or more and less than 2.52 micrometers; 2.52 micrometers or more and less than 3.17 micrometers; 3.17 micrometers or more and less than 4.00 micrometers; 4.00 micrometers or more and less than 5.04 micrometers; 5.04 micrometers or more and less than 6.35 micrometers; .35 μm or more and less than 8.00 μm; 8.00 μm or more and less than 10.08 μm; 10.08 μm or more and less than 12.70 μm; 12.70 μm or more and less than 16.00 μm; 16.00 μm or more and less than 20.20 μm; Less than 40 μm; 25.40 μm or more and less than 32.00 μm; 3 channels of 32.00 μm or more and less than 40.30 μm are used, and particles having a particle size of 2.00 μm or more and less than 40.30 μm are targeted.

<Toner production method>
The method for producing the toner can be appropriately selected according to the purpose, such as a polymerization method, a melt-kneading-pulverization method, and specific examples thereof include at least the amorphous polyester resin and the modified crystal in an organic solvent. An oil phase containing a water-soluble polyester resin, the mold release agent, and the colorant (sometimes referred to as a toner material) is dispersed in an aqueous medium to form a dispersion liquid. The method of granulating by removing the said organic solvent is mentioned.

The organic solvent preferably further contains the active hydrogen group-containing compound and a polymer having a site capable of reacting with the active hydrogen group-containing compound.
An example of such a method for producing the toner is a known dissolution suspension method.

  In addition, as another example of the method for producing the toner, the toner is produced by an extension reaction and / or a cross-linking reaction between the active hydrogen group-containing compound and a polymer having a site capable of reacting with the active hydrogen group-containing compound (hereinafter referred to as “the toner”). A method for forming toner base particles while producing an “adhesive substrate”) is shown below. In such a method, preparation of an aqueous medium, preparation of an oil phase containing a toner material, emulsification or dispersion of the toner material, removal of an organic solvent, and the like are performed.

(Preparation of aqueous medium (aqueous phase))
The aqueous medium can be prepared, for example, by dispersing conventionally known resin particles in an aqueous medium. The addition amount of the resin particles in the aqueous medium can be appropriately selected according to the purpose, but is preferably 0.5% by mass to 10% by mass.
The aqueous medium can be appropriately selected according to the purpose. Examples thereof include water, a solvent miscible with water, and a mixture thereof. These may be used individually by 1 type and may use 2 or more types together.
Among these, water is preferable.

  The solvent miscible with water can be appropriately selected depending on the purpose, and examples thereof include alcohol, dimethylformamide, tetrahydrofuran, cellosolves, and lower ketones. As said alcohol, it can select suitably according to the objective, For example, methanol, isopropanol, ethylene glycol, etc. are mentioned. The lower ketones can be appropriately selected depending on the purpose, and examples thereof include acetone and methyl ethyl ketone.

(Preparation of oil phase)
The oil phase containing a toner material is prepared in an organic solvent by containing the active hydrogen group-containing compound, a polymer having a site capable of reacting with the active hydrogen group-containing compound, the crystalline polyester resin, and the amorphous material. It can be carried out by dissolving or dispersing a toner material containing a polyester resin, the release agent, the colorant, and the like.
The organic solvent can be appropriately selected according to the purpose, but is preferably an organic solvent having a boiling point of less than 150 ° C. in terms of easy removal.
The organic solvent having a boiling point of less than 150 ° C. can be appropriately selected according to the purpose. For example, toluene, xylene, benzene, carbon tetrachloride, methylene chloride, 1,2-dichloroethane, 1,1,2- Examples include trichloroethane, trichloroethylene, chloroform, monochlorobenzene, dichloroethylidene, methyl acetate, ethyl acetate, methyl ethyl ketone, and methyl isobutyl ketone. These may be used individually by 1 type and may use 2 or more types together.
Among these, ethyl acetate, toluene, xylene, benzene, methylene chloride, 1,2-dichloroethane, chloroform, carbon tetrachloride and the like are preferable, and ethyl acetate is more preferable.

(Emulsification or dispersion)
The emulsification or dispersion of the toner material can be performed by dispersing an oil phase containing the toner material in the aqueous medium (step 1: preparation of a dispersion).
Then, when the toner material is emulsified or dispersed, the adhesive base material is obtained by subjecting the active hydrogen group-containing compound and the polymer having a site capable of reacting with the active hydrogen group-containing compound to an extension reaction and / or a crosslinking reaction. (Step 2: cross-linking or extension reaction).

  The adhesive base material is an aqueous medium containing an oil phase containing a polymer having reactivity to active hydrogen groups such as a polyester prepolymer having an isocyanate group, together with a compound containing active hydrogen groups such as amines. It is preferably produced by emulsifying or dispersing in the aqueous medium and subjecting both to an extension reaction and / or a crosslinking reaction in an aqueous medium. In addition, an oil phase containing a toner material is produced by emulsifying or dispersing in an aqueous medium to which a compound having an active hydrogen group has been added in advance, and subjecting both to an extension reaction and / or a crosslinking reaction in the aqueous medium. It is also possible to emulsify or disperse the oil phase containing the toner material in an aqueous medium, and then add a compound having an active hydrogen group to cause an elongation reaction and / or a cross-linking reaction between the two from the particle interface in the aqueous medium. May be generated. When both are subjected to an extension reaction and / or a crosslinking reaction from the particle interface, a urea-modified polyester resin is preferentially formed on the surface of the toner to be produced, and a concentration gradient of the urea-modified polyester resin can be provided in the toner.

  As the reaction conditions (reaction time, reaction temperature) for generating the adhesive substrate, depending on the combination of the active hydrogen group-containing compound and the polymer having a site capable of reacting with the active hydrogen group-containing compound. Can be appropriately selected.

The reaction time can be appropriately selected according to the purpose, but is preferably 10 minutes to 40 hours, and more preferably 2 hours to 24 hours.
The reaction temperature can be appropriately selected according to the purpose, but is preferably 0 ° C to 150 ° C, more preferably 40 ° C to 98 ° C.
A method for stably forming a dispersion containing a polymer having a site capable of reacting with an active hydrogen group-containing compound such as a polyester prepolymer having an isocyanate group in the aqueous medium is appropriately selected according to the purpose. Examples thereof include a method in which an oil phase prepared by dissolving or dispersing a toner material in an organic solvent is added to an aqueous medium phase and dispersed by shearing force.

The disperser for the dispersion can be appropriately selected according to the purpose. For example, a low speed shear disperser, a high speed shear disperser, a friction disperser, a high pressure jet disperser, and an ultrasonic disperser. , Etc.
Among these, a high-speed shearing disperser is preferable in that the particle diameter of the dispersion (oil droplets) can be controlled to 2 μm to 20 μm.

When the high-speed shearing disperser is used, conditions such as the number of rotations, the dispersion time, and the dispersion temperature can be appropriately selected according to the purpose.
The number of rotations can be appropriately selected according to the purpose, but is preferably 1,000 rpm to 30,000 rpm, and more preferably 5,000 rpm to 20,000 rpm.

  The dispersion time can be appropriately selected according to the purpose, but in the case of a batch method, 0.1 to 5 minutes is preferable.

The dispersion temperature can be appropriately selected according to the purpose, but is preferably 0 ° C to 150 ° C, more preferably 40 ° C to 98 ° C under pressure. In general, dispersion is easier when the dispersion temperature is higher.

  The amount of the aqueous medium used when emulsifying or dispersing the toner material can be appropriately selected according to the purpose, and is 50 parts by mass to 2,000 parts by mass with respect to 100 parts by mass of the toner material. Preferably, 100 mass parts-1,000 mass parts are more preferable.

  When the amount of the aqueous medium used is less than 50 parts by mass, the dispersion state of the toner material is deteriorated, and toner mother particles having a predetermined particle diameter may not be obtained, and the amount exceeds 2,000 parts by mass. The production cost may increase.

  When emulsifying or dispersing the oil phase containing the toner material, it is preferable to use a dispersant from the viewpoint of stabilizing the dispersion such as oil droplets to obtain a desired shape and sharpening the particle size distribution. .

The dispersant can be appropriately selected depending on the purpose, and examples thereof include surfactants, sparingly water-soluble inorganic compound dispersants, and polymeric protective colloids. These may be used individually by 1 type and may use 2 or more types together.
Among these, surfactants are preferable.

  The surfactant can be appropriately selected according to the purpose. For example, an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant, and the like can be used.

As said anionic surfactant, it can select suitably according to the objective, For example, alkylbenzene sulfonate, (alpha) -olefin sulfonate, phosphate ester, etc. are mentioned.
Among these, those having a fluoroalkyl group are preferable.

A catalyst can be used for the elongation reaction and / or the cross-linking reaction in producing the adhesive substrate.
The catalyst can be appropriately selected depending on the purpose, and examples thereof include dibutyltin laurate and dioctyltin laurate.

(Removal of organic solvent (step 3))
The method for removing the organic solvent from the dispersion such as the emulsified slurry can be appropriately selected according to the purpose. For example, the temperature of the entire reaction system is gradually raised to evaporate the organic solvent in the oil droplets. And a method of spraying the dispersion liquid in a dry atmosphere to remove the organic solvent in the oil droplets.
When the organic solvent is removed, toner base particles are formed. The toner base particles can be washed, dried, etc., and further classified. The classification may be performed by removing fine particle portions in a liquid by a cyclone, a decanter, centrifugation, or the like, or may be performed after drying.

The obtained toner base particles may be mixed with particles such as the external additive and the charge control agent. At this time, by applying a mechanical impact force, it is possible to prevent the particles such as the external additive from detaching from the surface of the toner base particles.
The method of applying the mechanical impact force can be appropriately selected according to the purpose, for example, a method of applying an impact force to the mixture using blades rotating at high speed, and the mixture is put into a high-speed air stream. And a method of accelerating particles to collide each other or particles against an appropriate collision plate.

  The apparatus used in the method can be appropriately selected according to the purpose. For example, an ong mill (manufactured by Hosokawa Micron Corporation), an I-type mill (manufactured by Nippon Pneumatic Co., Ltd.), and a pulverizing air pressure lowered, Examples include a hybridization system (manufactured by Nara Machinery Co., Ltd.), a kryptron system (manufactured by Kawasaki Heavy Industries, Ltd.), and an automatic mortar.

<Developer>
The developer of the present invention contains at least the toner and, if necessary, other components such as a carrier as appropriate.
For this reason, it is excellent in transferability, chargeability, etc., and a high quality image can be formed stably. The developer may be a one-component developer or a two-component developer. However, when used in a high-speed printer or the like that supports an increase in information processing speed in recent years, the lifetime is shortened. A two-component developer is preferred because it improves.

  When the developer is used as a one-component developer, even if the balance of the toner is performed, there is little fluctuation in the particle size of the toner, and members such as a filming of the toner on the developing roller and a blade for thinning the toner The toner is less fused to the toner, and good and stable developability and images can be obtained even with long-term stirring in the developing device.

When the developer is used as a two-component developer, even if the toner balance for a long period of time is performed, the fluctuation of the toner particle diameter is small, and good and stable developability and images can be obtained even with long-term stirring in the developing device. can get.
When the toner is used for a two-component developer, it may be used by mixing with the carrier. The content of the carrier in the two-component developer can be appropriately selected according to the purpose, but is preferably 90% by mass to 98% by mass, and more preferably 93% by mass to 97% by mass.

<Career>
The carrier can be appropriately selected according to the purpose, but a carrier having a core material and a resin layer covering the core material is preferable.
(Core material)
The material of the core material can be appropriately selected according to the purpose, and examples thereof include 50 emu / g to 90 emu / g manganese-strontium material, manganese-magnesium material, and the like. In order to ensure the image density, it is preferable to use a highly magnetized material such as iron powder of 100 emu / g or more and magnetite of 75 emu / g to 120 emu / g. In addition, since the impact of the developer in the standing state on the photoconductor can be alleviated and it is advantageous for high image quality, a low-magnetization material such as a copper-zinc system of 30 emu / g to 80 emu / g should be used. Is preferred.
These may be used individually by 1 type and may use 2 or more types together.

The volume average particle diameter of the core material can be appropriately selected according to the purpose, but is preferably 10 μm to 150 μm, and more preferably 40 μm to 100 μm.
When the volume average particle diameter is less than 10 μm, fine powder is increased in the carrier, and magnetization per particle may be reduced to cause carrier scattering. When the volume average particle diameter is more than 150 μm, the specific surface area is decreased, and the toner In the case of a full color with many solid portions, reproduction of the solid portions may be deteriorated.

(Resin layer)
The material of the resin layer can be appropriately selected from known resins according to the purpose. For example, amino resin, polyvinyl resin, polystyrene resin, polyhalogenated olefin, polyester resin, polycarbonate resin Resin, polyethylene, polyvinyl fluoride, polyvinylidene fluoride, polytrifluoroethylene, polyhexafluoropropylene, copolymer of vinylidene fluoride and acrylic monomer, copolymer of vinylidene fluoride and vinyl fluoride, tetrafluoroethylene and fluorine And fluoroterpolymers such as copolymers of vinylidene chloride and monomers having no fluoro group, silicone resins, and the like.
These may be used individually by 1 type and may use 2 or more types together.

  The amino resin can be appropriately selected depending on the purpose, and examples thereof include urea-formaldehyde resin, melamine resin, benzoguanamine resin, urea resin, polyamide resin, and epoxy resin.

  The polyvinyl resin can be appropriately selected according to the purpose, and examples thereof include acrylic resin, polymethyl methacrylate, polyacrylonitrile, polyvinyl acetate, polyvinyl alcohol, and polyvinyl butyral.

  The polystyrene-based resin can be appropriately selected depending on the purpose, and examples thereof include polystyrene and styrene-acrylic copolymer.

The polyhalogenated olefin can be appropriately selected depending on the purpose, and examples thereof include polyvinyl chloride.

  The polyester-based resin can be appropriately selected according to the purpose, and examples thereof include polyethylene terephthalate and polybutylene terephthalate.

The resin layer may contain conductive powder or the like as necessary. The conductive powder can be appropriately selected depending on the purpose, and examples thereof include metal powder, carbon black, titanium oxide, tin oxide, and zinc oxide.
The conductive powder preferably has an average particle size of 1 μm or less. When the average particle diameter exceeds 1 μm, it may be difficult to control the electric resistance.

  The resin layer is formed by preparing a coating solution by dissolving a silicone resin or the like in a solvent, and then coating and drying the coating solution on the surface of the core using a known coating method, followed by baking. Can do.

  The coating method can be appropriately selected depending on the purpose, and for example, a dip coating method, a spray method, a brush coating method, or the like can be used.

The solvent can be appropriately selected depending on the purpose, and examples thereof include toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, butyl cellosolve and the like.
The baking may be an external heating method or an internal heating method. For example, a method using a stationary electric furnace, a fluid electric furnace, a rotary electric furnace, a burner furnace, or the like, The method used, etc. are mentioned.

  The content of the resin layer in the carrier can be appropriately selected according to the purpose, but is preferably 0.01% by mass to 5.0% by mass. When the content is less than 0.01% by mass, a uniform resin layer may not be formed on the surface of the core material. When the content exceeds 5.0% by mass, the resin layer is thick and the carrier Fusion may occur between them, and the uniformity of the carrier may decrease.

<Image forming apparatus>
Next, an example of the image forming apparatus of the present invention will be described with reference to FIG. The image forming apparatus shown in FIG. 1 is a tandem color image forming apparatus. The image forming apparatus includes a copying machine main body, a paper feed table (200), a scanner (300), and an automatic document feeder (ADF) (400).

  The copying machine main body is provided with an endless belt-like intermediate transfer member (10) at the center. The intermediate transfer member (10) is stretched around the support rollers (14), (15) and (16), and can rotate clockwise in FIG. A cleaning device (17) for removing residual toner on the intermediate transfer member (10) is disposed in the vicinity of the support roller (15). The intermediate transfer member (10) stretched by the support roller (14) and the support roller (15) has four image forming units (18) of yellow, cyan, magenta, and black along the conveyance direction. Image forming means (20) arranged opposite to each other are arranged. An exposure device (21) is disposed in the vicinity of the image forming means (20). A secondary transfer device (22) is disposed on the side of the intermediate transfer member (10) opposite to the side on which the image forming means (20) is disposed. In the secondary transfer device (22), a secondary transfer belt (24), which is an endless belt, is stretched between a pair of support rollers (23), and the recording paper conveyed on the secondary transfer belt (24). And the intermediate transfer member (10) can contact each other. A fixing device (25) is arranged in the vicinity of the secondary transfer device (22). The fixing device (25) includes a fixing belt (26) that is an endless belt and a pressure roller (27) that is pressed against the fixing belt (26). A reversing device (28) for reversing the recording paper for forming images on both sides of the recording paper is disposed in the vicinity of the secondary transfer device (22) and the fixing device (25).

  Next, formation of a full color image (color copy) using the image forming means (20) will be described. First, the document is set on the document table (30) of the automatic document feeder (ADF) (400) or the automatic document feeder (400) is opened, and the document is placed on the contact glass (32) of the scanner (300). Is set and the automatic document feeder (400) is closed.

  When a start switch (not shown) is pressed, when a document is set on the automatic document feeder (400), the document is transported and moved onto the contact glass (32). ) When the original is set on the scanner, the scanner (300) is immediately driven, and the first traveling body (33) and the second traveling body (34) travel. At this time, light from the light source is irradiated by the first traveling body (33), and reflected light from the document surface is reflected by the mirror in the second traveling body (34). Further, the image is received by the reading sensor (36) through the imaging lens (35), and the original is read to obtain black, yellow, magenta and cyan image information. Next, each image information is transmitted to each image forming unit (18) in the image forming means (20), and a visible image of each color of black, yellow, magenta and cyan is formed.

  As shown in FIG. 1, the image forming unit (18) includes a charging device (no symbol) for uniformly charging the photoconductor (40) and an exposure device (21) based on each image information. The electrostatic latent image formed by exposing the photoconductor (40) like an image is developed using each toner (black toner, yellow toner, magenta toner, and cyan toner), and a visible image formed by each toner. A developing device (no symbol), a transfer charger (no symbol) for transferring a visible image onto the intermediate transfer member (10), a cleaning device (no symbol) and a charge eliminating device (no symbol). Thus, it is possible to form a visible image of each color based on each image information. Next, the visible images of the respective colors are sequentially transferred (primary transfer) onto the intermediate transfer body (10) rotated and moved by the support rollers (14), (15) and (16), and the visible images of the respective colors are obtained. Are superimposed to form a composite transfer image.

  On the other hand, in the paper feed table (200), one of the paper feed rollers (42) is selectively rotated to feed the recording paper from one of the paper feed cassettes (44) provided in the paper bank (43) in multiple stages. The paper is separated one by one by the separation roller (45), sent to the paper feed path (46), transported by the transport roller (47), led to the paper feed path (48) in the copying machine main body, and the registration roller (49 ) And stop. Alternatively, the paper feed roller (42) is rotated to feed out the recording paper on the manual feed tray (51), separated one by one by the separation roller (52), and put into the manual paper feed path (53). 49) and stop. The registration roller (49) is generally used while being grounded, but may be used in a state where a bias is applied to remove paper dust from the recording paper. Then, the registration roller (49) is rotated in time with the composite transfer image formed on the intermediate transfer member (10), and the recording paper is interposed between the intermediate transfer member (10) and the secondary transfer device (22). And a composite transfer image is transferred onto the recording paper (secondary transfer) by the secondary transfer device (22), whereby a color image is formed on the recording paper. The toner remaining on the intermediate transfer member (10) is removed by the cleaning device (17).

  The recording paper on which the color image is formed is conveyed by the secondary transfer device (22) and sent to the fixing device (25), where the composite transfer image is heated and pressure-fixed on the recording paper in the fixing device (25). Is done. Thereafter, the recording paper is switched by the switching claw (55), discharged by the discharge roller (56), and stacked on the discharge tray (57). Alternatively, it is switched by the switching claw (55), reversed by the reversing device (28) and led again to the transfer position, and after forming an image on the back surface, it is ejected by the ejection roller (56) and ejected by the ejection tray (57). Stacked on top.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to the following Example. “Part” means “part by mass”.

[Example 1]
~ Synthesis of crystalline polyester resin ~
In a reaction vessel equipped with a cooling pipe, a stirrer and a nitrogen introducing pipe, 100 mol% of dodecanedioic acid as an acid monomer, 100 mol% of 1,6-hexanediol as an alcohol component, a charging ratio of acid monomer and alcohol monomer OH / COOH = 1.1 and titanium dihydroxybis (triethanolaminate) as a condensation catalyst were added at 400 ppm based on the total monomer mass, and the reaction was carried out for 8 hours at 180 ° C. while distilling off the generated water under a nitrogen stream. .
Next, while the temperature was gradually raised to 220 ° C., the reaction was carried out for 4 hours while distilling off the water and residual monomer produced under a nitrogen stream, and the acid of the resulting crystalline polyester was further reduced under a reduced pressure of 5 mmHg to 20 mmHg. The reaction was continued until the value was 1 mgKOH / g or less.
The obtained crystalline polyester was transferred into a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe, and isophorone diisocyanate (IPDI) was mixed with the hydroxyl value of the crystalline polyester and the ratio of isocyanate groups NCO / OH = 0. And diluted to 50% by mass with ethyl acetate and reacted at 80 ° C. for 5 hours under a nitrogen stream. Thereafter, isophorone diamine was added to the isocyanate-modified crystalline polyester as NCO / NH ₂ = 1 and reacted at 80 ° C. for 2 hours.
Next, ethyl acetate was distilled off under reduced pressure to obtain [Crystalline Polyester Resin 1].

Crystalline polyester 1 has a melting point of 70 ° C., an Mw of 30000, an Mw of 1000 or less, an amount of 1.5%, an MW of 500 or less of an amount of 0.5%, and G ′ (+ 20 ° C.) of 2.3 × 10 ³ , The peak half-width of the peak with the highest peak intensity was 0.5, confirming that it had crystallinity.

~ Preparation of crystalline polyester resin dispersion ~
100 g of [Crystalline Polyester Resin 1] and 400 g of ethyl acetate were placed in a metal 2 L container, heated and dissolved at 75 ° C., and then rapidly cooled in an ice water bath at a rate of 27 ° C./min. To this, 500 ml of glass beads (3 mmφ) was added, and pulverized for 10 hours with a batch type sand mill (manufactured by Campehapio) to obtain [Crystalline Polyester Dispersion 1].

~ Synthesis of amorphous polyester ~
A 5-liter four-necked flask equipped with a nitrogen inlet tube, a dehydration tube, a stirrer, and a thermocouple was added to 229 parts of bisphenol A ethylene oxide side 2 mol adduct, 529 parts of bisphenol A propylene oxide 3 mol adduct, isophthalic acid. 100 parts, 108 parts of terephthalic acid, 46 parts of adipic acid and 2 parts of dibutyltin oxide were added, reacted at 230 ° C. for 10 hours at normal pressure, and further reacted for 5 hours at a reduced pressure of 10-15 mmHg. 30 parts of merit acid was added and reacted at 180 ° C. and normal pressure for 3 hours to obtain [Amorphous Polyester 1].
[Amorphous polyester 1] had a number average molecular weight of 1,800, a weight average molecular weight of 5,500, a Tg of 50 ° C., and an acid value of 20.

~ Synthesis of polyester prepolymer (binder resin precursor) ~
In a reaction vessel equipped with a cooling pipe, a stirrer and a nitrogen introduction pipe, 682 parts of bisphenol A ethylene oxide 2-mole adduct, 81 parts of bisphenol A propylene oxide 2-mole adduct, 283 parts of terephthalic acid, trimellitic anhydride 22 And 2 parts of dibutyltin oxide were added, reacted at 230 ° C. for 8 hours at normal pressure, and further reacted for 5 hours at a reduced pressure of 10 to 15 mmHg to obtain [Intermediate Polyester 1].
[Intermediate Polyester 1] had a number average molecular weight of 2,100, a weight average molecular weight of 9,500, Tg of 55 ° C., an acid value of 0.5, and a hydroxyl value of 51.
Next, 410 parts of [Intermediate Polyester 1], 89 parts of isophorone diisocyanate and 500 parts of ethyl acetate are placed in a reaction vessel equipped with a cooling pipe, a stirrer and a nitrogen introduction pipe, and reacted at 100 ° C. for 5 hours. Polymer 1] was obtained. [Prepolymer 1] had a free isocyanate mass% of 1.53%.

~ Synthesis of ketimine ~
In a reaction vessel equipped with a stirrer and a thermometer, 170 parts of isophoronediamine and 75 parts of methyl ethyl ketone were charged and reacted at 50 ° C. for 5 hours to obtain [ketimine compound 1]. The amine value of [ketimine compound 1] was 418.

-Production of master batch (MB)-
1200 parts of water, carbon black (made by Printex 35 Dexa) [DBP oil absorption = 42 ml / 100 mg, pH = 9.5] 540 parts, 1200 parts of amorphous polyester resin 1 were added, and Henschel mixer (made by Mitsui Mining Co., Ltd.) After mixing, the mixture was kneaded at 150 ° C. for 30 minutes using two rolls, rolled and cooled and pulverized with a pulverizer to obtain [Masterbatch 1].

-Synthesis of polycondensates obtained by polycondensation reaction of phenols and aldehydes-
0.45 mol of pt-butylphenol, 0.032 mol of 2,2′-bis (4-hydroxyphenyl) propane, 18.5 g of paraformaldehyde (0.6 mol as formaldehyde), and 3 g of 5N aqueous potassium hydroxide solution And refluxing reaction was performed for 8 hours while distilling off water in 300 mL of xylene.
The reaction solution is recrystallized using methanol, filtered, the filtrate is further washed with methanol, the obtained solid is dried, and a polycondensate A obtained by polycondensation of phenols and aldehydes is obtained. Obtained.

~ Preparation of oil phase ~
In a container equipped with a stirring bar and a thermometer, 378 parts of [Amorphous polyester 1], 110 parts of Carnauba WAX, 22 parts of [Polycondensate A] and 947 parts of ethyl acetate were charged, and the temperature was raised to 80 ° C. with stirring. After maintaining at 80 ° C. for 5 hours, it was cooled to 30 ° C. in 1 hour. Next, 500 parts of [Masterbatch 1] and 500 parts of ethyl acetate were charged in a container and mixed for 1 hour to obtain [Raw material solution 1].
[Raw material solution 1] 1324 parts are transferred to a container, and using a bead mill (Ultra Visco Mill, manufactured by Imex Co., Ltd.), a liquid feeding speed of 1 kg / hr, a disk peripheral speed of 6 m / sec, and 0.5 mm zirconia beads are 80% by volume. Carbon black and WAX were dispersed under conditions of filling and 3 passes. Next, 1042.3 parts of a 65% ethyl acetate solution of [Amorphous Polyester 1] was added, followed by one pass with a bead mill under the above conditions to obtain [Pigment / WAX Dispersion 1]. The solid content concentration of [Pigment / WAX Dispersion 1] (130 ° C., 30 minutes) was 50%.

~ Synthesis of organic fine particle emulsion ~
In a reaction vessel equipped with a stir bar and a thermometer, 683 parts of water, 11 parts of sodium salt of ethylene oxide methacrylate adduct sulfate (Eleminol RS-30: manufactured by Sanyo Chemical Industries), 138 parts of styrene, 138 parts of methacrylic acid, When 1 part of ammonium persulfate was charged and stirred at 400 rpm for 15 minutes, a white emulsion was obtained.
The system was heated to raise the system temperature to 75 ° C. and reacted for 5 hours. Further, 30 parts of a 1% ammonium persulfate aqueous solution was added, and the mixture was aged at 75 ° C. for 5 hours, and an aqueous dispersion of a vinyl resin (a copolymer of styrene-methacrylic acid-methacrylic acid ethylene oxide adduct sulfate sodium salt) [fine particles Dispersion 1] was obtained. The volume average particle diameter of the [fine particle dispersion 1] measured by LA-920 was 0.14 μm. A portion of [Fine Particle Dispersion 1] was dried to isolate the resin component.

-Adjustment of aqueous phase-
990 parts of water, 83 parts of [fine particle dispersion 1], 37 parts of a 48.5% aqueous solution of dodecyl diphenyl ether disulfonate (Eleminol MON-7: manufactured by Sanyo Chemical Industries) and 90 parts of ethyl acetate are mixed and stirred to give a milky white liquid. Got. This is designated as [Aqueous Phase 1].

-Emulsification / solvent removal-
[Pigment / WAX Dispersion 1] 664 parts, [Prepolymer 1] 109.4 parts, [Crystalline Polyester Dispersion 1] 73.9 parts, [Ketimine Compound 1] 4.6 parts, After mixing for 1 minute at 5,000 rpm with a TK homomixer (made by Tokushu Kika), add 1200 parts of [Aqueous Phase 1] to the container and mix with a TK homomixer at 13,000 rpm for 20 minutes [emulsified slurry 1] was obtained.
[Emulsion slurry 1] was put into a container equipped with a stirrer and a thermometer, and after removing the solvent at 30 ° C. for 8 hours, aging was carried out at 45 ° C. for 4 hours to obtain [Dispersion slurry 1].

~ Washing and drying ~
[Dispersion Slurry 1] After filtering 100 parts under reduced pressure,
(1): Add 100 parts of ion-exchanged water to the filter cake and mix with a TK homomixer (rotation speed: 1)
And filtered at 2,000 rpm for 10 minutes).
(2): 100 parts of a 10% aqueous sodium hydroxide solution was added to the filter cake of (1), mixed with a TK homomixer (30 minutes at 12,000 rpm), and then filtered under reduced pressure.
(3): 100 parts of 10% hydrochloric acid was added to the filter cake of (2), mixed with a TK homomixer (rotation speed: 12,000 rpm for 10 minutes), and then filtered.
(4): Add 300 parts of ion exchange water to the filter cake of (3), mix with TK homomixer (10 minutes at 12,000 rpm), and then filter.
The operations (1) to (4) were performed twice to obtain [Filter cake 1].
[Filter cake 1] was dried at 45 ° C. for 48 hours in a circulating drier and sieved with a mesh having a mesh size of 75 μm to obtain [Toner Base Particles 1].

Next, 100 parts by mass of the obtained [toner base particle 1] is mixed with 1.0 part by mass of hydrophobic silica (HDK-2000, manufactured by Wacker Chemie) using a Henschel mixer to obtain a volume average particle diameter. [Toner 1] having a particle size of 5.8 μm was produced.

[Example 2]
In the “emulsification / desolvation” in Example 1, [Pigment / WAX Dispersion 1] was changed to 524 parts, and [Crystalline Polyester Dispersion 1] was changed to 423.9 parts. [Toner 2] having a volume average particle diameter of 5.6 μm was obtained.

[Example 3]
[Toner 3] having a volume average particle diameter of 5.4 μm in the same manner as in Example 1 except that [Raw Material Solution 1] was changed to [Raw Material Solution 2] below in the preparation of the oil phase in Example 1. Was obtained.

Preparation of [Raw Material Solution 2] A container equipped with a stir bar and a thermometer was charged with 378 parts of [Amorphous Polyester 1], 110 parts of Carnauba WAX, 22 parts of [Polycondensate A], and 947 parts of ethyl acetate. The temperature was raised to 80 ° C., kept at 80 ° C. for 5 hours, and then cooled to 30 ° C. in 1 hour. Next, 500 parts of [Masterbatch 1], 30 parts of organically modified montmorillonite, and 500 parts of ethyl acetate were placed in a container and mixed for 1 hour to obtain [Raw material solution 2].

[Example 4]
Example of emulsification / desolvation in Example 1 except that the particle size of the emulsified particles was adjusted by changing the number of revolutions and the stirring time in the TK homomixer after adding 1200 parts of [aqueous phase 1]. 1 to obtain [Toner 4] having a volume average particle diameter of 4.1 μm.

[Example 5]
Example of emulsification / desolvation in Example 1 except that the particle size of the emulsified particles was adjusted by changing the number of revolutions and the stirring time in the TK homomixer after adding 1200 parts of [aqueous phase 1]. 1 to obtain [Toner 5] having a volume average particle diameter of 3.8 μm.

[Example 6]
Example of emulsification / desolvation in Example 1 except that the particle size of the emulsified particles was adjusted by changing the number of revolutions and the stirring time in the TK homomixer after adding 1200 parts of [aqueous phase 1]. 1 to obtain [Toner 6] having a volume average particle diameter of 6.2 μm.

[Comparative Example 1]
[Toner 7] having a volume average particle diameter of 5.8 μm was obtained in the same manner as in Example 3 except that [polycondensate A] was not added in the preparation of the oil phase in Example 3.

[Comparative Example 2]
[Toner 8] having a volume average particle size of 5.6 μm was obtained in the same manner as in Example 1 except that [polycondensate A] was not added in the preparation of the oil phase in Example 1.

[Comparative Example 3]
In the production of the oil phase in Example 1, the volume average was obtained in the same manner as in Example 1 except that 22 parts of [polycondensate A] was changed to 22 parts of CCA (salicylic acid metal complex E-84: Orient Chemical Industries). [Toner 9] having a particle size of 5.6 μm was obtained.

[Comparative Example 4]
[Toner 10] having a volume average particle diameter of 5.5 μm was obtained in the same manner as in Example 1 except that [Crystalline Polyester Dispersion 1] was not added in “Emulsification / Desolvation” in Example 1.

[Comparative Example 5]
In the preparation of the oil phase in Comparative Example 4, the volume average was obtained in the same manner as in Comparative Example 4 except that 22 parts of [polycondensate A] was changed to 22 parts of CCA (salicylic acid metal complex E-84: Orient Chemical Industries). [Toner 11] having a particle size of 5.7 μm was obtained.

A developer comprising 5% by mass of the toner thus treated with the external additive obtained as described above and 95% by mass of a copper-zinc ferrite carrier having an average particle diameter of 40 μm and coated with a silicone resin was prepared and fixed. The transferability was evaluated according to the following evaluation method. The evaluation results are shown in Table 2 below.

(Fixability)
A copy test was performed on type 6200 paper (manufactured by Ricoh) using an apparatus in which the fixing unit of a digital full-color copier (imageoMP C4500 manufactured by Ricoh) was modified.
Specifically, the cold offset temperature (fixing lower limit temperature) and the hot offset temperature (fixing upper limit temperature) were determined by changing the fixing temperature.
The evaluation conditions were a paper feed linear velocity of 200 to 220 mm / second, a surface pressure of 1.0 kgf / cm ² , and a nip width of 10.0 mm.
The fixing lower limit temperature was ranked by setting the fixing machine temperature in increments of 2 ° C. to pass an unfixed image, and setting the lowest temperature at which no cold offset occurred as the fixing lower limit temperature.
100 to 115: ○, 115 to 130: Δ, 130 or more: ×

The fixing upper limit temperature was determined by passing the unfixed image through the setting temperature of the fixing machine in increments of 2 ° C., and setting the maximum temperature at which hot offset does not occur as the fixing upper limit temperature.
190 or more: ○, 180-190: △, 180 or less: ×

(Transferability)
Single color mode using a digital full-color copier (Ricoh's imagioMP C4500) under high temperature and high humidity (HH, temperature 30 ° C, relative humidity 80%) or low temperature and low humidity (LL, temperature 10 ° C, relative humidity 15%) After running 1,000,000 line images with an image area ratio of 0.5% on A4 paper, a halftone image was output on the entire surface of A3, and the degree of density unevenness of the image was visually evaluated. In order from the best, “◎” indicates no density unevenness, “○” indicates a slight density unevenness in one place, “△” indicates a slight density unevenness in several places, and “×” indicates a slight density unevenness. The degree of density unevenness was clearly evaluated.


Table 1 shows the evaluation results of Examples and Comparative Examples.

DESCRIPTION OF SYMBOLS 10 Intermediate transfer bodies 14, 15, 16 Support roller 17 Cleaning device 18 Image forming unit 20 Image forming means 21 Exposure device 22 Secondary transfer device 23 Support roller 24 Secondary transfer belt 25 Fixing device 26 Fixing belt 27 Pressure roller 28 Reverse Device 30 Document base 32 Contact glass 33 First traveling body 34 Second traveling body 35 Imaging lens 36 Reading sensor 40 Photosensitive body 42 Paper feeding roller 43 Paper bank 44 Paper feeding cassette 45 Separating roller 46 Paper feeding path 47 Conveying roller 48 Feeding Paper path 49 Registration roller 51 Manual feed tray 52 Separating roller 53 Paper feed path 55 Switching claw 56 Discharge roller 57 Paper discharge tray 200 Paper feed table 300 Scanner 400 Automatic document feeder (ADF)

Japanese Patent Laid-Open No. 11-133665 JP 2002-287400 A JP 2002-351143 A Japanese Patent No. 2579150 JP 2001-158819 A JP-A-8-176310 Japanese Patent Laid-Open No. 2005-15589 JP 2010-49228 A 2010-128002 gazette JP 2010-164837 A

Claims (10)

A toner containing at least a binder resin, a colorant, and a charge control agent, wherein the binder resin includes urethane and / or urea-modified crystalline resin, and the charge control agent includes phenols A toner comprising a polycondensate obtained by a polycondensation reaction between an aldehyde and an aldehyde. The toner according to claim 1, wherein the modified crystalline resin is a crystalline polyester resin. The modified crystalline resin has a structural unit derived from an aliphatic dicarboxylic acid and a structural unit derived from an aliphatic diol, and has a melting point of 50 ° C or higher and lower than 80 ° C. The toner according to 1 or 2. The glass transition temperature of the first heating Tg (1 ^st), when the glass transition temperature in the temperature elevation second time was ^{Tg (2 nd), Tg (} 1 st) and the difference is 10 ° C. or more Tg (2 ^nd) The toner according to claim 1, wherein the toner is less than 30 ° C. The toner according to claim 1, wherein the toner has inorganic fine particles therein. The toner according to claim 5, wherein the inorganic fine particle is a layered inorganic mineral obtained by converting at least part of ions between layers with organic ions. The phenols include a phenol compound (A) having one phenolic hydroxyl group and a phenol compound (B) having two or more phenolic hydroxyl groups, and the phenol compound (A) and the phenol compound ( The toner according to claim 1, wherein the ortho position of the phenolic hydroxyl group is hydrogen. The phenol compound (A) is at least one selected from the group consisting of p-alkylphenol, p-aralkylphenol, p-phenylphenol, and p-hydroxybenzoic acid ester,
The phenol compound (B) is at least one selected from the group consisting of bisphenols, trisphenols, tetrakisphenols,
The toner according to claim 7, wherein the aldehyde is paraformaldehyde and / or formaldehyde.   A developer comprising the toner according to claim 1. An image forming apparatus comprising the toner according to claim 1.

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