JP3097714B2 - Toner for developing electrostatic images - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic image developing toner used for developing an electrostatic latent image formed in an electrophotographic method, an electrostatic recording method or the like.

[0002]

2. Description of the Related Art In a developing process, a developer used in an electronic copying machine or the like is once attached to an image carrier such as a photoconductor on which an electrostatic image is formed, and then is transferred to a photoconductor in a transfer process. Is transferred to the transfer paper, and is fixed on the copy paper surface in a fixing step. At this time, as a developer for developing an electrostatic charge image formed on the latent image holding surface, a two-component developer composed of a carrier and a toner and a one-component developer not requiring a carrier (magnetic toner or Non-magnetic toner) is known. As the toner contained in the developer, there is a positively charged toner. Conventionally, as a toner which imparts a positively charged toner chargeability, a toner such as a nigrosine dye, a quaternary ammonium salt or the like as an additive to the toner is used. Coating agents and the like for imparting predetermined chargeability to control agents and carriers are known. On the other hand, those which provide negative chargeability include charge control such as gold-containing azo dyes and inorganic oxides such as fine powder silica. And carrier coating agents are known.

[0003] In the fixing step, as a method of fixing on a copy paper surface, there are an open fixing method, a flash fixing method, a pressure fixing method, a heating roller fixing method, and the like. A fixing method is used. This method has extremely good thermal efficiency when fusing the surface of the roller and the image of the sheet to be fixed onto the sheet to be fixed, and can quickly fix the image. This is extremely effective as a fixing method at the time. However, in this method, since the toner image and the surface of the fixing roller come into pressure contact with each other in a heated and melted state, a part of the toner image is not transferred to the surface of the fixing roller and transferred, and is transferred again to the next sheet to be fixed. Offset development may occur and stains may be generated on the sheet to be fixed. Conventionally, as a method of not causing offset development of toner and not supplying an anti-offset liquid such as silicone oil to the surface of the fixing roller, for example, a material having excellent releasability from a roller surface to a toner such as a fluorine-based resin. And JP-A-52-3304, JP-B-60-17109, JP-B-57-52574, and JP-B-58-58664. In the method, the toner contains olefin waxes such as low molecular weight polypropylene and low molecular weight polyethylene. Etc. are suggested.

[0004]

However, toners containing conventional olefinic waxes can always be sufficiently satisfied in terms of image quality stability in continuous copying and printing for a long time and durability of a developer. It was not something. For example, when copying with a two-component developer composed of a toner and a carrier, a toner using an olefin wax having a molecular weight that is too low has an excellent effect of preventing offset development in fixing, but has a low fluidity of the toner. By worsening, brush streaks are noticeable in the solid black part, chipping is noticeable in the leading or trailing end of the black part, resulting in poor copy image quality.Furthermore, the toner component adheres to the photoreceptor during continuous copying due to filming phenomenon Deterioration of image quality during continuous copying, such as image defects tending to cause defects, and the uneven distribution of wax in the developer accumulating in the developer, resulting in poor toner charging rise, resulting in large image changes and instability. There was a problem. In addition, a toner using an olefin wax having a molecular weight that is too high does not provide a sufficient effect for preventing offset development during fixing. Therefore, if the addition amount of the olefin wax is excessively increased, the same problem as described above occurs. Was.

The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems. As a result, by adding a polypropylene wax having a specific molecular weight and a volatile content to the toner, the image quality is good, the image density is sufficient and the stability is high. It has been found that a toner excellent in the above is obtained, and the present invention has been achieved. That is, an object of the present invention is to provide a toner for developing an electrostatic image, which has excellent image quality, has little deterioration of image quality with time, and has excellent charging characteristics. Another object of the present invention is to provide a toner for developing an electrostatic charge image having a high image density, good stability, little toner scattering, little image fouling and the like, and excellent life stability. . Another object of the present invention is to provide an electrostatic charge image developing method that exhibits sufficient fixing performance without causing offset development even when toner is fixed by a heating roller fixing method that does not supply an offset preventing liquid such as silicone oil. To provide a toner.

[0006]

In order to solve the above-mentioned problems, the toner for developing an electrostatic image according to the present invention has a number average molecular weight of 3,000 to 10,000 by at least a resin, a colorant and a vapor pressure osmotic pressure method, and It is characterized by containing a polypropylene wax having a volatile content of 0.5% or less. As the resin component that can be used in the present invention, a known type suitable for a toner for developing an electrostatic image can be used. For example, polystyrene, chloropolystyrene, poly-α-
Methylstyrene, styrene-chlorostyrene copolymer,
Styrene-propylene copolymer, styrene-butadiene copolymer, styrene-vinyl chloride copolymer, styrene-
Vinyl acetate copolymer, styrene-acrylate copolymer (styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-octyl acrylate copolymer And styrene-phenyl acrylate copolymer), styrene-methacrylate copolymer (styrene-
Methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-butyl methacrylate copolymer, styrene-phenyl methacrylate copolymer), styrene-α-methyl methyl acrylate copolymer and styrene- Styrene-based resins such as acrylonitrile-acrylate copolymers (homopolymers or copolymers containing styrene or styrene substituents), vinyl chloride resins, rosin-modified maleic resins, phenolic resins, epoxy resins, polyester resins, polyethylene Resins, polypropylene resins, ionomer resins, polyurethane resins, silicone resins, ketone resins, ethylene-ethyl acrylate copolymers, xylene resins, polyvinyl butyral resins, polycarbonate resins, etc., are particularly preferred for use in the present invention. The have the resin can be a styrene resin, saturated or unsaturated polyester resin and epoxy resin are exemplified. More preferably, a styrene resin is good.

[0007] Styrene-based resins are classified into low-molecular weight polymers and high-molecular weight polymers in consideration of durability such as copy image stability and fixing performance stability when toner and developer are continuously copied and used. It is more preferable to design the molecular weight to have. The low molecular weight polymer is a styrene copolymer containing 50 to 100 parts by weight of styrene and 50 to 0 parts by weight of an acrylic component as a monomer unit. The high molecular weight copolymer is a styrene copolymer containing 40 to 90 parts by weight of styrene and 60 to 10 parts by weight of an acrylic component as monomer units. What gives the acrylic component is a so-called acrylic monomer, and specific examples thereof include alkyl acrylate and alkyl methacrylate such as methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, Ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, lauryl methacrylate,
There are stearyl methacrylate and the like, especially n-acrylic acid.
Butyl, ethylhexyl acrylate, n-methacrylic acid
Butyl and lauryl methacrylate are preferred.

[0008] The low molecular weight coalescence has a molecular weight peak (Lp) of 3000 to 80000 in the GPC chromatogram.
More preferably, it has at least one in the range of 4000 to 50,000. Although the fixing property of the low-molecular-weight product having a molecular weight peak Lp lower than 3000 is good, it tends to cause spent and finer toner in a developing machine.
The image quality becomes poor, and the life of the developer is deteriorated. Spent of a toner having a molecular weight peak Lp higher than 80000,
Although miniaturization is unlikely to occur, the fixability is poor in a low temperature region, and the cold offset temperature is also poor, which is not preferable. The high molecular weight polymer is constituted by having (1) a high molecular weight component which is not crosslinked, or (2) a crosslinked component.

(1) In case of non-crosslinked high molecular weight component The styrene copolymer has a high molecular weight peak (Hp) of 100,000 to 1 in the GPC chromatogram.
More preferably from 500,000 to 200,000 to 1200
Those having at least one in 000 are preferred. If the molecular weight peak Hp of the high molecular weight compound is lower than 100,000, the fixing property is good, but hot offset is apt to occur, and the usable fixing temperature range is undesirably narrow. On the other hand, when the molecular weight peak Hp exceeds 1500000, the hot offset resistance is good, but the fixability in a low temperature region becomes poor, and the fixing lower limit temperature is undesirably increased.

(2) Amount of Crosslinked High-Molecular-Weight Component In order to obtain a crosslinked high-molecular-weight product, a crosslinker of a constituent monomer is used as a constituent, and the amount of the crosslinker is 0.01
The content is preferably from 2 to 2% by weight, more preferably from 0.02 to 1% by weight. As a cross-linking agent is mainly a compound having two or more polymerizable double bonds, for example, divinylbenzene,
Aromatic divinyl compounds such as divinylnaphthalene, ethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, 1,3-butanediol.
Examples include diethylenic carboxylic acid esters such as dimethacrylate, 1,6-hexanediol / diacrylatearyl / methacrylate, N, N divinylaniline, divinyl ether, divinyl sulfide and the like. Divinylbenzene, ethylene glycol dimethacrylate, 1,
6-Hexanediol diacrylate is preferably used. Crosslinked high molecular weight tetrahydrofuran (TH
F) The insoluble content is preferably from 3 to 95% by weight, more preferably from 5 to 90% by weight. If the THF-insoluble content is lower than 3% by weight, hot offset is likely to occur, and the usable fixing temperature range is undesirably narrow. On the other hand, if the THF-insoluble content is higher than 95% by weight, the crosslinking density becomes too high, and the fixing becomes poor. (Measure the insoluble content by filtration using Celite.)

The ratio between the low molecular weight compound and the high molecular weight compound is 8
0-40% by weight is preferred. When the ratio of the low molecular weight compound exceeds 80 parts by weight, the fixing property is good, but the hot offset resistance is deteriorated, the usable temperature range is narrowed, which is not preferable. Is more likely to cause spent and finer particles, and if used for a long time, toner scattering and fog on a white background portion increase. On the other hand, when the ratio of the low molecular weight compound is less than 40 parts by weight, the durability and hot offset resistance of the developer are good, but the fixing property in a low temperature region is deteriorated, and the fixing lower limit temperature is undesirably increased.

The glass transition temperature of the styrene copolymer resin is preferably 50 ° C. or higher. When the glass transfer temperature is lower than 50 ° C., the toner is aggregated or adhered to the toner when left at a high temperature of 40 ° C. or more for a long period of time, which causes a problem in use. The flow softening temperature of the styrene-based copolymer resin may be appropriately selected in consideration of the fixing performance of the toner, the durability of the developer, and the like.
When fixing at a temperature of 20 ° C. to 220 ° C., for example, 8
0-160 ° C is preferable, and 90-150 ° C is suitable. Further, other sub-resins may be used in combination with the above-mentioned main resin, and the usage amount of the sub-resins is preferably 30% by weight or less based on the total resin amount. As the sub-resin, for example, a styrene copolymer resin having only one molecular weight peak,
Rosin-modified maleic resin, phenol resin, silicone resin, ketone resin, epoxy resin polyester resin, xylene resin, polyvinyl butyral resin, and the like can be used alone or in combination of two or more.

The colorant used in the present invention is not particularly limited as long as it is conventionally used.
Any suitable pigment or dye can be used. For example, titanium oxide, zinc white, alumina white, calcium carbonate, navy blue, carbon black, phthalocyanine blue,
Colorant is used alone for the color of toner corresponding to phthalocyanine green, Hansa Yellow G, rhodamine-based face wash, chrome yellow, quinacridone, benzidine yellow, rose bengal, triallylmethane-based dye, anthraquinone dye, monoazo and disazo-based face wash Or mix and use. The content of the colorant may be sufficient to color the toner so that a visible image can be formed by development, and is preferably, for example, 1 to 20 parts by weight based on 100 parts by weight of the resin.

The polypropylene wax used in the present invention has the following characteristics. The number average molecular weight (Mn) of the polypropylene wax is 3000 to 10000 as measured by a vapor pressure osmometry.
And more preferably 4000 to 9000. In the present invention, a polypropylene wax having a number average molecular weight of 5,000 to 10,000 is used. When the number average molecular weight is less than 3,000, there is an effect of preventing the offset of fixing, but it is not preferable because the image quality such as the brush streaks of the black solid portion of the toner and the lack of the image is poor and a high image density cannot be stably obtained. When the number average molecular weight is higher than 10,000, the image quality and image stability are excellent, but the effect of preventing offset in fixing is not sufficiently obtained, which is not preferable.

On the other hand, if the volatile matter content of the wax is higher than 0.5%, the stability of the toner charge amount during continuous copying is poor, and the toner density in a two-component developer greatly changes. However, it is not preferable because fog fluctuates greatly and toner scattering inside the copying machine increases. When the volatile content is 0.5% or less, the toner charge amount and the stability of the toner concentration in the developer are good, and the image stability and the toner scattering state are also good. The volatile matter in the wax was dried at 115 ° C. for 4 hours and determined as a weight loss before and after drying. The melting point of the wax is calculated from the peak position temperature of the endothermic pattern in thermal analysis (differential thermal analyzer, differential scanning calorimeter, etc.).
The temperature is preferably 180 to 180 ° C, more preferably 120 to 160 ° C. 1
If the toner has a high melting point of 80 ° C or higher, the wax will not be sufficiently melted even when heated at the time of manufacturing the toner in a kneading machine or the like, and the compatibility with the resin will be deteriorated, and the minimum fixing temperature of the toner will deteriorate. Not preferred. A toner having a low melting point of 100 ° C. or less is not preferable because the kneading shear is hardly applied when the toner is manufactured by a kneading machine, and the dispersibility of the colorant and other internal additives is deteriorated.

The content of the wax in the toner varies depending on the resin component, the colorant, the fixing mechanism, and the like to be used. However, in the heating roller fixing method, generally 0.5 to 10 parts by weight based on 100 parts by weight of the resin. More preferably, the amount is about 1 to 6 parts by weight, and if the amount is less than 0.5 to 10 parts by weight, the effect of preventing offset in fixing becomes small, and the amount exceeds 10 parts by weight. This has an adverse effect on the fluidity and chargeability of the toner, leading to poor image quality and poor image stability, which is not preferable. In addition, in addition to the above-mentioned polypropylene wax, a small amount of polypropylene wax, polyethylene wax, paraffin wax, higher fatty acid, fatty acid amide, metal soap or the like having a different number average molecular weight (Mn) may be added as necessary. In addition, for the purpose of adjusting the chargeability of the toner, in the case of a positively charged toner, a nigrosine dye,
Known charge control agents such as quaternary ammonium salts, triaminotriphenylmethane compounds and imidazole compounds, and known negatively charged toners such as gold-containing azo dyes, salicylate metal complexes and alkylsalicylate metal complexes in the case of negatively charged toners. An appropriate amount of a charge control agent may be added. The addition amount is preferably about 0.05 to 10 parts by weight based on 100 parts by weight of the resin.

Further, the fluidity of the toner on the surface of the toner particles,
For the purpose of improving coagulation resistance, adjusting toner resistance, and controlling charge, it is also possible to add metal oxide fine powders such as titania, silica, alumina, magnetite, and ferrite and organic fine powders such as acrylic resin alone or as a mixture. It is possible. The addition amount is preferably about 0.01 to 5 parts by weight based on 100 parts by weight of the toner particles. Further, when the toner of the present invention is used for a two-component developer, it may be mixed with a magnetic carrier, and the content ratio of the carrier to the toner in the developer is 10%.
0: 1 to 10 parts by weight are preferred. As the magnetic carrier, conventionally known ones such as iron powder, ferrite powder, magnetite powder, and magnetic resin carrier having an average particle diameter of about 20 to 200 μm can be used. In addition, known silicone resin, acrylic resin fluorine resin, etc. on these surfaces,
Alternatively, those coated with a mixture of these resins can also be suitably used.

The toner of the present invention can be used as a magnetic one-component toner containing a magnetic substance such as magnetite which is a one-component developer without using a carrier, or a non-magnetic one-component toner containing no magnetic substance. . As the method for producing the toner particles, various conventionally used toner production methods can be applied.For example, as a general example, first, a resin, a colorant, a wax, a charge control agent, and the like are uniformly mixed with a known mixer. The mixture may be dispersed and mixed, and then the mixture may be melt-kneaded in a closed kneader or a single- or twin-screw extruder, cooled, pulverized, and classified. In recent years, single-screw or twin-screw extruders have become the mainstream because of their advantages such as continuous production. For example, KTK twin-screw extruders manufactured by Kobe Steel, TEM extruders manufactured by Toshiba Machine Co., Ltd. A twin screw extruder manufactured by CK Corporation, a PCM type twin screw extruder manufactured by Ikegai Iron Works, or a kneader manufactured by Buss is preferred. The average particle size of the toner is 3 to 20 μm
Is preferred. Further, when the toner is externally added, the classified toner and the external additive may be stirred and mixed with a high-speed stirrer or the like.

[0019]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the present invention. In addition, in the following examples, all simply referred to as "parts" mean "parts by weight". <Example 1>

[Table 1] ・ Styrene / n-butyl acrylate copolymer resin 100 parts by weight (flow softening point 126 ° C., glass transition point 60 ° C.) ・ Colorant carbon black MA-7 5 parts by weight (manufactured by Mitsubishi Kasei Corporation) ・ Low molecular weight 2 parts by weight of polypropylene a (Mn = 8000, volatile content = 0.2%, melting point = 148 ° C.) 2 parts by weight of charge control agent Bontron P51 (quaternary ammonium salt manufactured by Orient Chemical Co., Ltd.) and continuous twin screw extrusion The mixture was kneaded, pulverized and classified using a machine to obtain a black toner having an average particle size of 10 μm. To 100 parts of this black toner, 0.2 parts of silica powder (R972 manufactured by Nippon Aerosil Co., Ltd.) was externally added using a Henschel mixer to obtain Toner A. 4 parts of the obtained toner A and an average particle diameter of 100 coated on the surface with a methyl silicone-containing resin
100 parts of a ferrite powder carrier of 100 μm were mixed to prepare a stirring agent A.

The developer A was subjected to a real test using a copying machine having the following configuration. The copier uses an organic photoconductor as a photoconductor. The fixing machine has a heat roller with a thin layer of Teflon resin coated on silicone rubber and a heater lamp inside the roller.
And a lower pressure roller made of silicone rubber. The copy speed is 50 sheets / min. In this copier, without supplying a release liquid such as silicone oil,
Set the fixing temperature to 190 ℃, temperature 23-25 ℃, humidity 50-60
A real copy test of 50,000 sheets was performed under the condition of% RH. Note that the replenishment toner used in the actual test was toner A having the same composition as the toner used in the developer.

As a result of the actual shooting test, 50,000 from the beginning
The amount of charge of the developer and the toner concentration were stable until the number of sheets. In addition, the average uniformity of the copy black portion, good chipping, high image density, and stable image quality, no increase in fog, which is a stain on the copy white background portion, and almost no contamination due to toner scattering inside the machine, durability It was a toner and a developer having excellent properties. Further, there was almost no stain on the fixing roller, and there was no stain on both sides of the paper that passed through. The transition of the copy image data and the like at this time is shown in FIG.

<Example 2> A toner B and a developer B were prepared in the same manner as in Example 1 except that the amount of the low molecular weight polypropylene a added in Example 1 was changed to 5 parts. Was carried out. 5 from the beginning of the live-action test
The amount of charge of the developer and the toner concentration remained stable up to 000 sheets. The uniformity and chipping of the copy black portion were almost good, but the image density was high and stable, and there was no increase in fog, which is a stain on the copy white background, and there was no contamination due to toner scattering inside the machine. There was no toner and developer with excellent durability. Further, there was no stain on the fixing roller, and there was no stain on both sides of the paper that passed through.

Example 3 A toner was prepared in the same manner as in Example 1 except that the low molecular weight polypropylene a in Example 1 was changed to 2 parts of b (Mn = 5000, volatile content = 0.3%, melting point = 148 ° C.). C and developer C were prepared, and a 50,000 sheet actual test was performed. As a result of live-action test, 50,000 from the beginning
The charge amount of the developer and the toner concentration were almost stable up to zero sheets. The uniformity of the copy black portion, the chipping is almost good, the image density is high, and the image density is almost stable, and the fog, which is a stain on the copy white background portion, is lower than the initial level and is almost stable. There was almost no contamination, and the toner and developer were excellent in durability performance. Further, there was no stain on the fixing roller, and there was no smear on both sides of the paper. FIG. 2 shows the transition of the copy image data and the like at this time.

Comparative Example 1 The low molecular weight polypropylene a of Example 1 was replaced with c (Mn = 12,000
0, volatile content = 0.3%, melting point = 150 ° C)
A toner C and a developer C were prepared in the same manner as in Example 1, and 50,0
A real photo test of 00 sheets was performed. As a result of the actual shooting test, the charge amount of the developer tends to decrease from the beginning to 50,000 sheets, the toner density tends to increase, the image density increases as a copy image, and the image has poor gradation, In addition, the fogging was good at the beginning, but tended to deteriorate from the middle. In addition, brush streaks and chipping were noticeable in black portions in terms of copy image quality, which was not preferable. Further, contamination due to scattering of toner inside the apparatus was considerably large and was at a noticeable level. The fixing roller had almost no stain, and there was no stain on the front and back sides of the passed paper.

Comparative Example 2 A toner was prepared in the same manner as in Example 1 except that the low molecular weight polypropylene a in Example 1 was changed to 2 parts of d (Mn = 2100, volatile matter = 0.3%, melting point = 144 ° C.). D and developer D were prepared, and a 50,000 sheet actual test was performed. 50,0 from the beginning
Up to 00 sheets, the charge amount of the developer and the toner concentration were stable, and the uniformity and chipping of the black portion of the copy were good, the image density was high, and the image was almost stable. Was. Further, the stain on the fixing roller was considerably conspicuous, and both sides of the passed paper were stained during the actual shooting.

Comparative Example 3 The low molecular weight polypropylene c of Example 3 was replaced with e (Mn = 5,000
0, volatile content = 0.9%, melting point = 148 ° C)
A toner E and a developer E were prepared in the same manner as in Example 3, and 50,0
A real photo test of 00 sheets was performed. As a result of the actual shooting test, the charge amount of the developer showed a tendency to slightly decrease from the initial stage to 50,000 sheets, the toner density showed a tendency to increase, and the image density of the black part of the copy gradually increased from the middle, and the gradation The image was somewhat poor, and fog was low at the beginning, but deteriorated in the middle. In addition, there is a considerable problem of contamination due to scattering of toner inside the apparatus. In addition, there was no stain on the fixing roller, and there was no stain on both sides of the paper that passed through. FIG. 3 shows the transition of the copy image data and the like at this time.

[0027]

<Explanation of Terms> Image density: A value obtained by measuring a copy black portion with a mabes reflection densitometer. Vd = 500V means that the photoconductor surface potential is 700V
Indicates that the bias potential is 200 V and the development potential is 500 V. Vd = 300 V means that the photoconductor surface potential is 500 V
Indicates that the bias potential is 300 V. Fog: For the stain on the copy white background, the hunter whiteness (Wb) before and after copying the used paper was measured using a Nippon Denshoku Color Difference Meter, and the value obtained from the difference between the values before and after the copy was defined as fog.
The case where the developing potential Vd is 500 V is shown. Toner charge amount: A developer was sampled and measured with a Toshiba chemical blow-off charge amount measuring device. Toner concentration: The developer was sampled, the toner was removed, and the toner concentration was determined by weight analysis.

[0029]

By using the toner for electrostatic charge development of the present invention, the toner charging characteristics are good, the copy image quality, image density, fog, etc. are good, and the copy image and image quality change even during continuous copying. The present invention provides a great industrial advantage such that the heating roller is less contaminated and shows sufficient fixing performance.

[Brief description of the drawings]

FIG. 1 shows the transition of copy image data and the like during continuous copying in a first embodiment.

FIG. 2 shows changes in copy image data and the like during continuous copying in a third embodiment.

FIG. 3 Transition of copy image data and the like during continuous copying in a comparative example

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Mikio Unno 370 Enzo, Chigasaki-shi, Kanagawa Pref. Inside the Chigasaki Works of Mitsubishi Chemical Corporation (56) References JP-A-62-191859 (JP, A) JP-A-63- 301961 (JP, A) JP-A-59-174852 (JP, A)

Claims (3)

(57) [Claims] 1. An electrostatic charge image developing toner comprising at least a resin, a colorant, and a polypropylene wax having a number average molecular weight of 5,000 to 10,000 by vapor pressure osmometry and a volatile content of 0.5% or less. 2. The electrostatic image developing toner according to claim 1, wherein the toner is used in a developing method using an organic photoconductor as a photosensitive member. 3. The electrostatic image developing toner according to claim 1, wherein the toner is used for a two-component developer containing a carrier.