JPH06208244A - Resin composition for electrophotographic toner - Google Patents

Abstract

PURPOSE:To ensure a high hot offsetting temp. and excellent flowability of a toner by using a resin compsn. consisting of a thermoplastic resin binder and a releasing agent consisting of low mol.wt. polypropylene(PP) resin and PP resin modified with maleic anhydride. CONSTITUTION:This resin compsn. consists of a thermoplastic resin binder and a releasing agent consisting of low mol.wt. PP resin and modified PP resin obtd. by modifying low mol.wt. PP resin with one or more kinds of acid monomers selected among (meth)acrylic acid, maleic acid and maleic anhydride. The acid value of the modified PP resin is 0.5-40. In the case of <0.5 acid value, this resin compsn. does not produce a satisfactory effect of improving the flowability of an electrophotographic toner. In the case of >40 acid value, hot offsetting temp. is liable to drop. The weight ratio of the low mol.wt. PP resin to the modified PP resin in the releasing agent is (70:30)-(99.5:0.5) and the weight ratio of the releasing agent to the thermoplastic resin binder is (0.5:99.5)-(10:90).

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a resin composition for electrophotographic toner. More specifically, the present invention relates to a resin composition for a toner containing a release agent for an electrophotographic toner, which is suitable for a heat fixing type copying machine or printer having excellent hot offset property and fluidity.

[0002]

2. Description of the Related Art A heat fixing type toner is fixed on a support by a heat roll. At that time, it is desired that the lower limit fixing temperature is low. On the other hand, when the roll temperature rises, the phenomenon that the toner sticks to the roll appears. The temperature at which this hot offset occurs is desired to be high. Generally, as the molecular weight of the binder increases, the hot offset temperature increases, but at the same time, the lower limit fixing temperature also increases. On the contrary, when the molecular weight decreases, both the hot offset temperature and the fixing lower limit temperature decrease. As a method to meet this contradictory required performance,
An electrophotographic toner having a hot offset temperature increased by adding a releasing agent such as low molecular weight polypropylene is known. However, polypropylene having a low molecular weight has a low hardness and therefore has a drawback of lowering the fluidity of the toner, and in order to improve this drawback, studies have been made to modify it with a carboxylic acid or an acid anhydride.

[0003]

However, the low-molecular-weight polypropylene resin modified as described above has the effect of suppressing the deterioration of the fluidity of the toner due to the increase in hardness, but on the other hand, it is unmodified. Compared with this, the melt viscosity becomes higher, so that there is a drawback that the hot offset temperature is lowered, and it has not been put to practical use.

[0004]

DISCLOSURE OF THE INVENTION As a result of intensive studies by the present inventor, a release agent for an electrophotographic toner and a resin composition for a toner having a high hot offset temperature and excellent fluidity of a toner have been studied. Arrived That is, in the present invention, the low molecular weight polypropylene resin (A) and the low molecular weight polypropylene resin (b1) are used as one or more acid monomers (b2) selected from the group consisting of (meth) acrylic acid, maleic acid and maleic anhydride. (3) A release agent (I) comprising a modified polypropylene resin (B) modified by (1) and a thermoplastic resin binder (C).

The low molecular weight polypropylene resin (A) in the present invention usually has a melt viscosity at 160 ° C. of 10 to 10.
The polypropylene resin has a propylene content of 3000 cps and a propylene unit content of usually 75% by weight or more.

The melt viscosity of the low molecular weight polypropylene resin (A) of the present invention at 160 ° C. is usually 10 to 30.
00 cps, preferably 15 to 2000 cps.
When the melt viscosity at 160 ° C. is less than 10 cps, the fluidity of the toner decreases when used as an electrophotographic toner. If it exceeds 3000 cps, the hot offset temperature may decrease. The melt viscosity at 160 ° C. can be measured using, for example, a Brookfield type rotational viscometer. Conditions other than the measurement temperature are set according to JIS-K7117-1987, and an oil bath equipped with a temperature regulator may be used to adjust the temperature of the measurement sample.

The propylene unit content in the low molecular weight polypropylene resin (A) is usually 75% by weight.
The above is preferably 80% by weight or more. When the content of the propylene unit is less than 75%, the hot offset temperature may decrease when used in an electrophotographic toner.

In the present invention, the low-molecular-weight polypropylene resin (b1) constituting the modified polypropylene resin (B) before being modified with the acid monomer (b2) is 160
A polypropylene resin having a melt viscosity at 10 ° C. of usually 10 to 5000 cps and a propylene unit content of usually 75% by weight or more. Specific examples thereof include the same as those exemplified above as the polypropylene resin (A). Although (b1) and (A) may be the same or different, it is preferable to use, as (b1), a low molecular weight polypropylene resin having a melt viscosity at 160 ° C. which is equal to or higher than that of (A).

The melt viscosity of the low molecular weight polypropylene resin (b1) of the present invention at 160 ° C. is usually 10-5.
000 cps, preferably 15 to 3000 cps. When the melt viscosity at 160 ° C. is less than 10 cps, the fluidity of the toner decreases when used as an electrophotographic toner. If it exceeds 5000 cps, the hot offset temperature may decrease. The (b1) may be the same as the above (A), but (b1)
As 1), it is preferable to use one having a melt viscosity at 160 ° C. higher than that of (A).

The content of propylene units in the low molecular weight polypropylene resin (b1) is usually 75% by weight or more, preferably 80% by weight or more, as in the case of (A). When the content of the propylene unit is less than 75%, the hot offset temperature may decrease when used in an electrophotographic toner.

The low molecular weight polypropylene resin (b1)
For example, a thermal degradation product of a high molecular weight polypropylene resin; a partial oxide of the thermal degradation product; and a thermal degradation product of the styrene monomer (styrene, α-methylstyrene, p-methylstyrene, p -Methoxystyrene, etc.),
(Meth) acrylic acid alkyl ester [(meth) acrylic acid methyl ester, (meth) acrylic acid ethyl ester, (meth) acrylic acid butyl ester, etc.], maleic acid alkyl ester (maleic acid monomethyl ester,
Maleic acid monoethyl ester, maleic acid monobutyl ester, maleic acid dimethyl ester, maleic acid diethyl ester, maleic acid dibutyl ester, etc.), nitrile group-containing monomer [(meth) acrylonitrile, etc.], Japanese Patent Application No. 2-105702 Examples thereof include silane compounds, those modified with monomers other than acid monomers such as organic fluorine compounds described in Japanese Patent Application No. 2-304826; and partial oxides of these modified products.

Examples of the above-mentioned heat-degradable high-molecular-weight polypropylene resin include, for example, homopolymers of propylene; copolymers of propylene with other olefins (ethylene, butene, etc.); and those polymers mentioned above. Styrene monomer, (meth) acrylic acid alkyl ester,
Examples thereof include those modified with monomers other than acid monomers such as maleic acid alkyl esters, nitrile group-containing monomers, organic silane compounds, and organic fluorine compounds. The melt index of this high molecular weight polypropylene resin is JI
The melt index at 190 ° C. is usually 0.1 to 150, preferably 1 in accordance with S-K6758.
~ 100 g / 10 min. Is.

As an example of the method for producing the heat-degraded product, the high-molecular-weight polypropylene resin described above is used at a temperature of 300 to 450 ° C. for 0.5 to 300
A thermal degradation product is obtained by passing through for 10 hours. The melt viscosity of the thermal degradation product can be adjusted by the thermal degradation temperature and the thermal degradation time. If it is less than 300 ° C, it takes a long time for thermal degradation, and if it exceeds 450 ° C, the thermal degradation becomes too short, so that it becomes difficult to adjust the melt viscosity.

In the present invention, the amount of the acid monomer constituting the modified polyolefin resin (B) is usually 0.1 to 50% by weight, preferably 0.2 to 40% by weight,
More preferably, it is 0.5 to 30% by weight. When the amount of the acid monomer used is less than 0.1% by weight, when used in an electrophotographic toner, a sufficient effect of improving the fluidity of the toner cannot be obtained. On the other hand, if it exceeds 50% by weight, the hygroscopicity of the modified polyolefin resin is increased, and when it is used for a toner, the stability of the image density may be deteriorated.

In the present invention, an example of the method for producing the modified polypropylene resin (B) is as follows. The polypropylene resin (b1) is one selected from the group consisting of (meth) acrylic acid, maleic acid and maleic anhydride. Grafting or addition reaction of the above acid monomers in the presence or absence of a peroxide catalyst can give (B). In addition to the acid monomer, other radically polymerizable monomer [such as styrene-based monomer, (meth) alkyl ester, maleic acid alkyl ester, nitrile group-containing monomer, organic silane compound, organic fluorine compound, etc.] described above is used if necessary. be able to.

The above-mentioned graft or addition reaction is carried out under an inert gas atmosphere in a peroxide catalyst (benzoyl peroxide, lauroyl peroxide, di-t-butyl peroxide, t-butyl cumyl peroxide, dicumyl peroxide, t). -Butyl peroxybenzoate,
1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane etc.) or without a catalyst,
Above the melting point of the polyolefin resin (A) and below 300 ° C,
The melting point is preferably 250 ° C. or higher and the reaction time is 1 to 20.
Can be done in time.

The acid value of the modified polypropylene resin (B) of the present invention is usually 0.5 to 40, preferably 1 to 20. When the acid value is less than 0.5, the effect of improving the toner fluidity is insufficient when used in an electrophotographic toner. If it exceeds 40, the hot offset temperature may decrease.

The weight ratio of (A) / (B) in the release agent of the present invention is usually 70/30 to 99.5 / 0.5, preferably 80/20 to 99/1. When the content of (B) is less than 0.5% by weight, the effect of improving the fluidity of the toner is insufficient when used in an electrophotographic toner. If it is used in an amount exceeding 70% by weight, the hot offset temperature may decrease.

The resin composition of the present invention comprises the releasing agent of the present invention and a thermoplastic resin binder (C). The thermoplastic resin binder (C) may be any one that is usually used as a binder for toner,
Although not particularly limited, examples thereof include styrene resins, styrene- (meth) acrylic acid ester copolymers, styrene-butadiene resins, polyester resins, epoxy resins, polyurethane resins, and composites thereof. Of these, preferred is styrene- (meth)
Acrylic ester copolymers and polyester resins.

Examples of styrene- (meth) acrylic acid ester copolymers include styrene-based monomers [styrene, alkylstyrene (α-methylstyrene, p-methylstyrene, p-methoxystyrene, etc.)] and (meth ) Acrylic ester-based monomers {Acrylic alkyl (meth) acrylates having 1 to 18 carbon atoms [methyl (meth) acrylate, ethyl (meth) acrylate,
Butyl (meth) acrylate, 2-ethylhexyl acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, etc.], hydroxyl group-containing (meth) acrylate [hydroxyl ethyl (meth) acrylate, etc.], amino group-containing (meth) acrylate [ And dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, morpholinoethyl (meth) acrylate, etc.]}.

As a constituent component of this copolymer, if necessary, other monomers (vinyl ester (vinyl acetate etc.), vinyl ether (vinyl ethyl ether etc.), aliphatic hydrocarbon vinyl (butadiene, α-olefin etc.), nitrile Group-containing vinyl compound [(meth) acrylonitrile, etc.], N-vinyl compound (N-vinylpyrrolidone, etc.),
Unsaturated carboxylic acid or its anhydride [(meth) acrylic acid, maleic anhydride, itaconic anhydride, etc.], a polyfunctional monomer having two or more polymerizable double bonds [divinylbebenzene, 1,6-hexanediol Diacrylate,
Di (meth) acrylic acid ester etc.] of ethylene oxide adduct of bisphenol A] and the like} may be used together with a styrene-based monomer and a (meth) acrylic acid-based monomer to copolymerize them. The amount of the other monomers in the copolymer is usually 0 to 30% by weight, preferably 0 to 20% by weight, based on the weight of all the monomers.

As an example of the method for producing a styrene- (meth) acrylic acid ester copolymer, solution polymerization, suspension polymerization, or bulk polymerization is carried out using each of the above monomers in the presence or absence of a polymerization initiator. To obtain a copolymer. As the polymerization initiator, an azo-based initiator (azobisisobutyronitrile, azobisisovaleronitrile, etc.),
Peroxide initiator [benzoyl peroxide, lauroyl peroxide, di-t-butyl peroxide,
t-butylcumyl peroxide, dicumyl peroxide, t-butylperoxybenzoate, 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane and the like]. The polymerization reaction is usually carried out in an inert gas atmosphere. Polymerization temperature is usually 50 to 250
C., preferably 70 to 230.degree. While the reaction time depends on other conditions, it is generally 1 to 50 hours, preferably 2 to 15 hours. After the polymerization, a copolymer can be obtained through processes such as solvent removal, monomer removal or drying.

As the polyester resin, a condensation product of a polyhydric alcohol and a polycarboxylic acid can be mentioned.
As the polyhydric alcohol, ethylene glycol, propylene glycol, 1,6-hexanediol, neopentyl glycol, diethylene glycol; diol such as hydrogenated bisphenol A; triol such as trimethylolpropane; bisphenol (bisphenol A, bisphenol F) Examples thereof include alkylene oxide (ethylene oxide, propylene oxide, etc.) adduct; phenol resin alkylene oxide (ethylene oxide, propylene oxide, etc.) adduct, and the like. Examples of polycarboxylic acids include aliphatic dicarboxylic acids (malonic acid, succinic acid, adipic acid, etc.), aromatic dicarboxylic acids and their anhydrides (phthalic acid, phthalic anhydride, terephthalic acid, isophthalic acid, etc.), trivalent The above-mentioned polycarboxylic acids (trimellitic acid, etc.) and the like can be mentioned, and they can be produced by a known method.

The composition ratio of the releasing agent (I) of the present invention and the thermoplastic resin binder (C) in the resin composition of the present invention may be adjusted according to the required performance of the toner.
The weight ratio of (I) / (C) is usually 0.5 / 99.5 to 10
/ 90, preferably 1/99 to 5/95.

The resin composition of the present invention is used as a component of an electrophotographic toner by compounding a colorant and various additives in addition to the release agent and the thermoplastic resin binder. Examples of the colorant include carbon, iron black, benzidine yellow, quinacdrine, rhodamine B and phthalocyanine. Various additives include charge control agents (nigrosine, quaternary ammonium salts, etc.), magnetic powders (iron, cobalt,
Powder of ferromagnetic metal such as nickel or magnetite,
Hematite, ferrite, etc.) and the like. The colorant is usually used in an amount of 1 to 30 parts by weight based on 100 parts by weight of the resin composition of the present invention.

To produce a toner for electrophotography, 1) the toner components are dry-blended, melt-kneaded, then coarsely pulverized, finally finely pulverized by a jet pulverizer, and further classified to have a particle size of usually 2 ~ 2O fine powder, 2)
The monomer constituting the thermoplastic resin binder (C) is suspension-polymerized in the presence of other toner components, and the particle size is usually 2 to 20.
It can also be obtained by obtaining fine powder of μ, but the production method is not particularly limited thereto.

The electrophotographic toner may contain iron powder if necessary.
It is mixed with carrier particles such as glass beads, nickel powder, and ferrite and used as a developer for an electric latent image. Further, hydrophobic colloidal silica fine powder can be used for improving the fluidity of the powder.

The electrophotographic toner is fixed on a support (paper, polyester film, etc.) by being heated by a heat fixing heat roll of a copying machine such as a heat fixing type copying machine or a printer, and is used as a recording material.

[0029]

The present invention will be further described with reference to the following examples, but the present invention is not limited thereto. In the examples, all parts are parts by weight.

Synthesis Example 1 A high molecular weight polypropylene (J130G manufactured by Ube Industries) was
Thermal degradation was carried out at 355 to 360 ° C. for 80 minutes while continuously passing through a tube incorporating a static mixer to obtain a polypropylene resin (A-1) having a melt viscosity of 70 cps and an isotactic content of 96%.

Synthesis Example 2 Ethylene-propylene copolymer (J609 manufactured by Ube Industries)
H) is heat-degraded for 80 minutes at 355 to 360 ° C. while continuously passing through a tube incorporating a static mixer, and a polypropylene resin (A) having a melt viscosity at 160 ° C. of 72 cps and an isotactic content of 90%. -2) was obtained.

Synthesis Example 3 Polypropylene having a melt viscosity of 300 cps (b1-1) was subjected to thermal degradation for 50 minutes at 355 to 360 ° C. while continuously passing a high molecular weight polypropylene (J130G manufactured by Ube Industries Ltd.) through a tube incorporating a static mixer. ) Got. 400 g of the obtained polypropylene (b1-1) and 12 g of maleic anhydride were charged into a 1 L 4-necked Korben equipped with a nitrogen introduction tube, a thermometer, a cooling tube and a stirring rod, and nitrogen was passed through the Kolben with a mantle heater. heating. The reaction was carried out at 195 ° C. for 10 hours while heating and stirring. After the reaction, the system was depressurized while maintaining the temperature at 195 ° C, and the temperature was 5 mm.
The mixture was degassed under a reduced pressure of Hg for 1 hour to remove unreacted volatile components such as maleic anhydride. Removed after cooling, 160 ℃
A modified polypropylene resin (B-1) modified with maleic anhydride having a melt viscosity of 430 cps and an acid value of 13 was obtained.

Synthesis Example 4 400 g of polypropylene (b1-1) obtained in Synthesis Example 3 and 40 g of maleic anhydride were placed in a 1 L autoclave, the system was replaced with nitrogen, and the temperature was maintained at 180 ° C. while heating and stirring. 100 g of a 2 wt% di-t-butyl peroxide xylene solution was continuously added dropwise to the system for 4 hours. After cooling, it was taken out, charged into a 1L 4-necked Kolben equipped with a thermometer and a stirring rod, and deaerated for 2 hours under a reduced pressure of 195 ° C. and 5 mmHg or less to remove volatile components such as xylene and unreacted maleic anhydride. . After cooling, it was taken out to obtain a modified polypropylene resin (B-2) modified with maleic anhydride having a melt viscosity at 160 ° C. of 2200 cps and an acid value of 42.

Synthesis Example 5 Using 660 parts of styrene and 340 parts of butyl acrylate, thermal polymerization was carried out at 130 to 180 ° C. without using a solvent or a polymerization initiator. Then, volatile components such as residual monomers are removed under reduced pressure of 180 ° C. and 5 mmHg or less, and Tg 53 ° C.,
Number average molecular weight 11,000, weight average molecular weight 70,000
0 styrene-acrylic ester type thermoplastic resin (C
-1) was obtained. The molecular weight was measured by the GPC method. The molecular weight of the thermoplastic resin was measured by the GPC method under the following conditions. Equipment: Toyo Soda HLC802A column: TSKgel GMH6 2 Measurement temperature: 40 ° C. Sample solution: 0.5 wt% THF solution Solution injection amount: 200 μl Detector: Refractive index detector

Synthesis Example 6 302 g of isophthalic acid, 480 g of an ethylene oxide 2 mol adduct of bisphenol A and 1.6 g of dibutyltin oxide were subjected to an esterification reaction at 220 ° C. to give Tg.
A polyester thermoplastic resin (2) having a temperature of 63 ° C., an acid value of 45, and a hydroxyl value of 1.5 was obtained.

Example 1 480 g of polypropylene resin (A-1) and 20 g of modified polypropylene resin (B-1) are charged into a 1 L Kolbe MM equipped with a thermometer and a stir bar. Mixing was performed at 180 ° C. for 1 hour while heating and stirring. After taking out, it was cooled to obtain the release agent (R-1) of the present invention.

Example 2 480 g of the polypropylene resin (A-1) and 20 g of the modified polypropylene resin (B-2) were uniformly mixed in the same manner as in Example 1 to obtain the release agent (R-2 of the present invention. ) Got.

Example 3 425 g of polypropylene-based resin (A-1) and 75 g of modified polypropylene-based resin (B-1) were uniformly mixed in the same manner as in Example 1 to obtain the release agent (R-3 of the present invention. ) Got.

Example 4 480 g of the polypropylene resin (A-2) and 20 g of the modified polyolefin resin (B-1) were uniformly mixed in the same manner as in Example 1 to obtain the release agent (R-4 of the present invention. ) Got.

Example 5 450 g of thermoplastic resin (C-1) and release agent (R-1) 5
2 g at 190 ° C. using the same apparatus as in Example 1.
Mixed for hours. After taking out, it was cooled to obtain a resin composition (Z-1) of the present invention.

Comparative Example 1 Polypropylene resin (A-1) alone was used as a comparative release agent (R-5).

Comparative Example 2 150 g of the polypropylene resin (A-1) and 350 g of the modified polypropylene resin (B-2) were uniformly mixed in the same manner as in Example 1 to obtain a comparative release agent (R-6). And

Use Example 1 An electrophotographic toner was prepared by the following method using a release agent (R-1) and a thermoplastic resin (C-1), and further an electrophotographic developer was prepared. << Toner Preparation Method >> Release Agent (R-1) 4 parts Thermoplastic Resin (C-1) 87 parts Carbon Black 8 parts (Mitsubishi Chemical Co., Ltd. MA-100) Charge Control Agent 1 part (Hodogaya Chemical Industry Co., Ltd., Spiron Black TRH) The above blends were powder blended, then kneaded with a Labo Plastomill at 140 ° C. and 30 rpm for 10 minutes, and the kneaded mixture was finely pulverized with a jet mill PJM100 (Nippon Pneumatic Co., Ltd.) did. Fine powder of 2 μm or less was cut from the finely pulverized product with a powder airflow classifier MSD (manufactured by Nippon Pneumatic Co., Ltd.). To 1000 parts of the obtained powder was uniformly mixed 3 parts of Aerosil R972 (Japan Aerosil) to obtain a toner. << Developer Preparation Method >> 1000 parts of an electrophotographic carrier iron powder (F-100 manufactured by Nippon Iron Powder Co., Ltd.) was mixed with 25 parts of the toner to obtain an electrophotographic developer (G-1).

Use Examples 2 to 4 The release agent (R-1) was replaced with the release agents (R-2) to (R-, respectively).
Developers (G-2) to (G-4) for electrophotography were obtained in the same manner as in Use Example 1 except that the procedure (4) was changed.

Use Example 5 Use Example 1 except that 4 parts of the release agent (R-1) was used as 40 parts of the resin composition (Z-1) and 87 parts of the thermoplastic resin (C-1) was used as 51 parts. By the same method, the electrophotographic developer (G
-5) was obtained.

Use Example 6 An electrophotographic developer (G-6) was obtained in the same manner as in Use Example 1 except that the thermoplastic resin (C-1) was changed to the thermoplastic resin (C-2).

Comparative Use Examples 1 and 2 The release agent (R-1) was compared with the release agents (R-5) and (R-
Comparative electrophotographic developers (G-7) and (G-8) were obtained in the same manner as in Use Example 1 except that the procedure (6) was changed.

Developers (G-1) obtained in Use Examples 1 to 6
Comparative Test Examples 1 and 2 for the developers (G-7) and (G-8) obtained in Test Examples 1 to 6 of (G-6) and Comparative Use Examples 1 and 2.
The evaluation results of are shown in Table 1.

[0049]

[Table 1]

Evaluation method (1) Hot offset resistance A commercially available thermal fixing type copying machine was used and evaluated by the temperature of the heat roll at which hot offset occurs. E: 240 ° C. or higher G: 220 ° C. or higher and lower than 240 ° C. P: 220 ° C. or lower (2) Fluidity The fluidity index was measured and evaluated using a powder tester manufactured by Hosokawa Micron. E: Fluidity index 80 or more G: Fluidity index 70 or more and less than 80 P: Fluidity index less than 70 (3) Filming property 100% of developer for 3 hours in a turbuler shaker mixer
After stirring at rpm, the amount of toner adhering to the carrier surface was observed with a microscope.

The toner containing the resin composition for electrophotographic toner of the present invention exhibits excellent hot offset resistance without impairing the fluidity, and the adhesion of the toner to the carrier (filming on the carrier) is small. Was confirmed.

[0052]

The resin composition for an electrophotographic toner of the present invention exhibits excellent hot offset resistance without impairing the fluidity of the toner, and has little filming substance adhesion to the carrier. Therefore, the usefulness of the resin composition of the present invention is extremely high.

Claims (5)

[Claims] 1. A low molecular weight polypropylene resin (A)
And low molecular weight polypropylene resin (b1) (meta)
A mold release agent (I) comprising a modified polypropylene resin (B) modified with at least one acid monomer (b2) selected from the group consisting of acrylic acid, maleic acid and maleic anhydride.
And a thermoplastic resin binder (C), which is a resin composition for electrophotographic toner. 2. The resin composition for electrophotographic toner according to claim 1, wherein the polypropylene resin (b1) is a thermal degradation product of a high molecular weight polypropylene resin. 3. The resin composition for electrophotographic toner according to claim 1, wherein the modified polypropylene resin (B) has an acid value of 0.5 to 40. 4. A weight ratio of (A) / (B) is from 70/30.
It is 99.5 / 0.5, The resin composition for electrophotographic toners in any one of Claims 1-3. 5. The weight ratio of (I) / (C) is 0.5 / 9.
The resin composition for electrophotographic toner according to any one of claims 1 to 4, which has a viscosity of 9.5 to 10/90.