JP2002139861A - Toner for full color development - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toner for full color development having superior fixability and anti-offsetting property even when fixing conditions (fixing speed, fixing pressure and fixing temperature) are widely varied so as to obtain an image with an arbitrary gloss and the toner is used in a fixing system in which the amount of oil applied to a fixing roll is reduced or oil is not applied at all. SOLUTION: A releasing agent comprising a low melting wax (a) having 70-100 deg.C melting point and a high melting wax (b) having 110-150 deg.C melting point is dispersed in a fixing resin comprising a linear polyester (A) and a nonlinear polyester (B).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full-color developing toner, and more particularly, to a full-color developing toner capable of forming a good image corresponding to various fixing conditions.

[0002]

2. Description of the Related Art In an electrostatographic method employed in an image forming apparatus such as a copying machine, a facsimile, a printer, or the like, the surface of a photoreceptor is uniformly charged, and the surface of the photoreceptor is charged based on constant image information. An electrostatic latent image (charge image) is formed by performing light irradiation, and the electrostatic latent image is developed using a developer containing a toner charged to positive or negative polarity.
The transfer sheet, onto which the toner image has been transferred, is transferred to the surface of a transfer sheet such as paper or an OHP film.
An image is formed by fixing the toner image on the surface of the transfer sheet by heat and pressure through the space between the transfer roller and the pressure roller. Recently, full-color image forming apparatuses have become widespread. In full-color development, toner of each color (for example, black toner, cyan toner, magenta toner, and yellow toner) is used, and development and transfer are performed for each color. A full-color image is formed by superimposing the toner images of the respective colors on the transfer sheet and fixing the toner images.

[0003] By the way, high glossiness is generally required for full-color images having high decorativeness such as photographic images, but glossiness is not particularly required for monochrome images represented by character images. It is required to suppress glossiness. Therefore, with the spread of full-color image forming apparatuses, it is desired that the glossiness of an image can be arbitrarily controlled. That is, even in the full-color image forming apparatus, the frequency of forming a monochrome character image has become extremely high. In order to respond to such a demand, Japanese Patent Application Laid-Open No. Hei 9-269699 discloses a method using a toner containing 5 to 30% by volume of inorganic or organic fine particles.
A color image forming method for changing glossiness (gloss) by controlling a fixing speed, a fixing pressure and a fixing temperature has been proposed. Even when the fixing speed, the fixing pressure and the fixing temperature are changed in accordance with the glossiness of a target image, the toner used in the prior art has excellent fixability (binding force to transfer paper or the like). ) And offset resistance, which are extremely significant.

[0004]

In a conventional full-color image forming apparatus, in order to prevent toner from adhering to the fixing roller and winding of the transfer sheet around the fixing roller (ie, offset), silicone oil or the like is used. A large amount of oil is applied to the fixing roller, which causes the transfer paper on which an image is formed to have a sticky feeling,
Further, there is a problem that writing on such transfer paper becomes difficult with a pen or the like. Further, in the full-color image forming apparatus, since development is performed for each color toner, a developing device is provided for each color toner, so that the apparatus itself is large and the inside of the apparatus has a complicated structure. .
Therefore, providing a device for applying oil to the fixing roller has a problem that the device is further enlarged and complicated.

In order to solve the above-mentioned problem, a small amount of oil is applied to the fixing roller, or a fixing system in which no oil is applied (hereinafter, these fixing systems are sometimes referred to as an oilless fixing system). ) Has been proposed, but in addition to the above-mentioned wide variation in fixing conditions (fixing speed, fixing pressure and fixing temperature), even when such an oilless fixing system is employed, excellent fixing properties and anti-offset properties are obtained. Are not yet known. For example, Japanese Patent Application Laid-Open No. 9-2696 described above.
No. 95, the toner used in the color developing method, when used in an oilless fixing system,
Depending on the fixing conditions, the fixing property or the offset resistance becomes unsatisfactory. Further, in the above-mentioned prior art toner, a large amount of fine particles are added in order to improve the binding strength with transfer paper when forming an image having a low glossiness (low gloss). In OHP images,
There is a drawback that the transmittance is reduced and OHP (overhead project) cannot be used effectively.

Therefore, an object of the present invention is to provide an image forming apparatus having an arbitrary glossiness even when the fixing conditions (fixing speed, fixing pressure and fixing temperature) are varied widely, and the oil is applied to the fixing roller. It is an object of the present invention to provide a full-color developing toner having excellent fixability and anti-offset property even when the amount is small or when employed in a fixing system in which no oil application is performed. Another object of the present invention is to provide a full-color developing toner which exhibits a high transmittance and can form a good OHP image.

[0007]

According to the present invention, a low-melting wax (a) having a melting point of 70 to 100 ° C. is contained in a fixing resin component comprising a linear polyester (A) and a non-linear polyester (B). ) And a high melting point wax (b) having a melting point of 110 to 150 ° C, wherein a release agent component is dispersed.

In the toner of the present invention, (1) the release agent component is dispersed with an average particle size of 0.2 μm or less; (2) the linear polyester (A) and the non-linear polyester (B) means that A: B is used in a weight ratio of 2: 8 to 8: 2, particularly 4: 6 to 6: 4;
(3) The melting point of the linear polyester (A) is 80 to 120 ° C, and the melting point of the non-linear polyester is 12
0 to 160 ° C., (4) the low-melting wax (a) and the high-melting wax (b) weigh a: b = 7: 3 to 3: 7, particularly 6: 4 to 4: 6. Used in the ratio,
The release agent component composed of the low-melting wax (a) and the high-melting wax (b) is contained in an amount of 5 to 15 parts by weight, particularly 7 to 12 parts by weight, per 100 parts by weight of the fixing resin component. And (5) the low-melting wax (a) is a carnauba wax, and the high-melting wax (b) is preferably a polyolefin wax.

In order to obtain an image having a high gloss (high gloss image), it is sufficient to increase the smoothness of the image. To obtain an image having a low gloss (low gloss image), the smoothness of the image is lowered. do it. Therefore, generally, the higher the fixing speed (that is, the rotation speed of the fixing roller), the lower the gloss can be obtained, and the higher the fixing pressure, the higher the gloss can be obtained. The higher the value, the higher the gloss image can be obtained. In the toner of the present invention, a linear polyester (A) and a non-linear polyester (B) are used as fixing resin components, and a low-melting wax (a) and a high-melting wax (b) are used as a releasing agent component.
Is used, even when fixing conditions (fixing speed, fixing pressure and fixing temperature) are set so that a high gloss image is formed by the interaction of these components,
Further, even when the fixing conditions are set so that a low gloss image is formed, excellent fixability (binding strength to transfer paper) and offset resistance are exhibited. That is, in the case of forming a low gloss image, since the fixing conditions are set so that the smoothness of the image is low, toner adhesion to the fixing roller hardly occurs. The binding strength to the paper is reduced, and the transfer paper is easily wrapped around the fixing roller. However, in the present invention, the interaction between the linear polyester (A) and the low-melting wax (a) increases the binding strength of the toner image to the transfer paper even under such fixing conditions, and the fixing roller The wrapping of the transfer paper around is also effectively increased. On the other hand, in the case of forming a high gloss image, since the fixing conditions are set so as to enhance the smoothness of the image, the binding strength of the toner image to the transfer paper is high, and the transfer paper of the transfer Although wrapping is unlikely to occur, toner adhesion to the fixing roller is extremely likely to occur. In the present invention, the interaction between the non-linear polyester (B) and the high melting point wax (b) effectively prevents the toner from adhering to the fixing roller even under such fixing conditions, and furthermore, smoothes the image. Sex is also enhanced.

[0010] As described above, the toner of the present invention comprises:
Even when a low gloss image or a high gloss image is formed, excellent offset resistance (prevention of wrapping of the transfer paper around the fixing roller and prevention of toner adhesion to the fixing roller) is exhibited. Even when the amount of oil applied to the fixing roller is small or an oilless fixing system that does not apply oil at all is adopted, such offset resistance is exhibited. That is, in the present invention, the interaction between the linear polyester (A) and the low-melting wax (a) or the interaction between the non-linear polyester (B) and the high-melting wax (b) causes the resistance under each fixing condition. Since the offset property is synergistically enhanced, excellent offset resistance can be ensured even when an oilless fixing system is employed. Although the reason why such a synergistic interaction between the polyester and the wax is obtained has not been clearly elucidated, it is probably that the linear polyester (A) and the low melting point wax (a), and the non-linear polyester ( It is considered that B) and the high melting point wax (b) may exhibit a high affinity for each other.

In the present invention, in order to maximize the interaction between the fixing resin component (polyester) and the release agent component (wax), the release agent component, ie,
The low-melting wax (a) and the high-melting wax (b) have a content of 0.
It is preferable to disperse in the fixing resin component with an average particle diameter of 2 μm or less. Further, by dispersing the wax as a release agent component in such an average particle size, OH
A high transmittance OHP image can be formed on a P film.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Fixing Resin Component) In the present invention, a polyester resin is used as a fixing resin. That is, when a material other than the polyester resin is used as the fixing resin, such as a styrene-acrylic resin, no interaction with a low to high melting point wax used as a release agent described later does not appear, and the present invention You cannot achieve your goals. The polyester resin used as the fixing resin is obtained by polycondensation of a polyhydric alcohol and a polycarboxylic acid known per se.

For example, polyhydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4-butanediol, neopentyl glycol, and 1,4-butenediol. , 1,5-pentanediol, 1,6-hexanediol, 1,4-
Diols such as cyclohexanediol, dipropylene glycol, polyethylene glycol, polypropylene glycol, and polytetramethylene glycol; and bisphenols such as bisphenol A, hydrogenated bisphenol A, polyoxyethylenated bisphenol A, and polyoxypropylene bisphenol A, etc. Dihydric alcohols and sorbitol, 1,2,3,6-hexanetetrol, 1,4-sorbitan, pentaerythritol, dipentaerythritol, tripentaerythritol, 1,2,4-butanetriol, 1,2,5 -Pentanetriol, glycerol, diglycerol, 2
-Methylpropanetriol, 2-methylpropanetriol, 2-methyl-1,2,4-butanetriol,
Trimethylolethane, trimethylolpropane, 1,
Trihydric or higher alcohols such as 3,5-trihydroxymethylbenzene are exemplified.

The polyhydric carboxylic acids to be polycondensed with the above-mentioned polyhydric alcohols include maleic acid, fumaric acid, citraconic acid, itaconic acid, glutaconic acid, phthalic acid, isophthalic acid, cyclohexanedicarboxylic acid, succinic acid,
Adipic acid, sebacic acid, azelaic acid, malonic acid, n
-Butyl succinic acid, n-butenyl succinic acid, isobutyl succinic acid, isobutenyl succinic acid, n-octyl succinic acid, n-octenyl succinic acid, n-dodecyl succinic acid,
divalent carboxylic acids such as n-dodecenylsuccinic acid, isododecylsuccinic acid, isododecenylsuccinic acid, and 1,2,4
-Benzenetricarboxylic acid (trimellitic acid), 1,
2,5-benzenetricarboxylic acid, 2,5,7-naphthalenetricarboxylic acid, 1,2,4-naphthalenetricarboxylic acid, 1,2,4-butanetricarboxylic acid, 1,2,2
5-hexanetricarboxylic acid, 1,3-dicarboxyl-2-methyl-2-methylenecarboxypropane, 1,
There are trivalent or higher carboxylic acids such as 2,4-cyclohexanetricarboxylic acid, tetra (methylenecarboxyl) methane, 1,2,7,8-octanetetracarboxylic acid, pyromellitic acid, and empole trimer. In the present invention, among the polyesters described above, a linear polyester (A) and a non-linear polyester (B) are used in combination as a fixing resin component.

The linear polyester (A) is a polyester having a linear molecular chain. Specifically, among the polyesters obtained by the polycondensation of the above-mentioned polyhydric alcohol and polyvalent carboxylic acid, dihydric polyester is used. It means what is obtained by polycondensation of an alcohol and a divalent carboxylic acid,
Particularly, bisphenols are preferable as the dihydric alcohol, and terephthalic acid is preferable as the dihydric carboxylic acid. In addition, the linear polyester (A) enhances the fixability under low gloss image forming conditions due to the interaction with the low melting point wax (a) described below due to the linear molecular chain. While it is possible to increase the binding strength of the toner image to the transfer paper and at the same time to effectively prevent the transfer paper from winding around the fixing roller, the substantial linearity of the molecular chains is not impaired, and As long as the interaction with the low melting point wax (a) is not impaired, a small amount of a polyhydric alcohol or polycarboxylic acid component may be contained. Such a linear polyester (A) desirably has a melting point in the range of 90 to 120 ° C. in order to maximize the interaction with the low melting point wax (a) described below.

On the other hand, the non-linear polyester (B) is a polyester having a non-linear molecular chain, that is, a cross-linked structure. Specifically, at least one of a polyhydric alcohol and a polycarboxylic acid component is used. As a part, it means a polyester obtained by polycondensation using a trihydric or higher alcohol or a carboxylic acid, and particularly, as the trihydric or higher alcohol, trimethylolpropane or the like is preferably used, and trihydric or higher As the carboxylic acid, trimellitic acid, hexyltricarboxylic acid and the like are preferably used. In addition, the non-linear polyester (B), due to its non-linear molecular chain, interacts with a high melting point wax (b) to be described later to form a toner under high gloss image forming conditions. It effectively prevents the adhesion to the fixing roller and further enhances the smoothness of the toner image. However, in order to sufficiently exhibit the interaction with the high melting point wax (b), a trivalent or higher alcohol is used. It is preferred that the component contains 2 mol% or more of the total alcohol component, or 2 mol% or more of the trivalent or more carboxylic acid component based on the whole carboxylic acid. The melting point of the non-linear polyester (B) is desirably in the range of 120 to 150 ° C. in order to maximize the interaction with the high and low melting point wax (b) described below.

In the present invention, the linear polyester (A)
And the non-linear polyester (B) must be used in an appropriate balance, and if one of them is used in an unnecessarily large amount, the properties derived from the other polyester will be impaired. For this reason, although it differs depending on the melting point of each polyester, generally, the linear polyester (A) and the non-linear polyester (B) are A: B = 2: 8 to 8:
2, particularly preferably in a weight ratio of 4: 6 to 6: 4. In particular, in terms of fixability, a flow tester (load:
The softening temperature of the toner measured at 20 kgf) is 100
It is desirable to use it at a rate such that it becomes 140 ° C. In the present invention, the linear polyester (A) and the non-linear polyester (B) are used as the fixing resin component. However, as long as the object of the present invention is not impaired, for example, a styrene resin or a styrene-acrylic resin may be used. It is also possible to use a small amount (for example, weight% or less) of another resin such as a polymer resin.

(Release Agent) In the toner of the present invention, as the release agent, conventionally known waxes, for example, aliphatic hydrocarbon-based waxes such as paraffin wax, petroleum wax, polyethylene wax, polypropylene wax, and polyethylene oxide wax. Wax, montan wax, carnauba wax, beeswax, wood wax and the like are used. Among these waxes, low melting point wax (a) having a melting point of 70 to 100 ° C., particularly 80 to 90 ° C., and melting point of 110 to 110 ° C.
To 150 ° C., especially 120 to 140 ° C., in combination with a high melting point wax (b). That is, as described above, the low-melting wax (a) is composed of the linear polyester (A)
And a high melting point wax (b) to improve the fixing property under low gloss image forming conditions and the offset resistance (prevention of wrapping of the transfer paper around the fixing roller).
Improves the offset resistance (prevention of toner adhesion to the fixing roller) under conditions of high gloss image formation and the smoothness of the toner image by interaction with the non-linear polyester. For example, when a wax having a melting point lower than the above range is used as the low melting point wax (a), the toner is likely to aggregate, the charging stability of the toner is impaired, and the melting point is in the above range. If a higher wax is used, the effect of improving properties under low gloss image forming conditions will be impaired. On the other hand, when a wax having a melting point lower than the above range is used as the high melting point wax (b), the effect of improving properties under high gloss image forming conditions is impaired, and the melting point is lower than the above range. When a high wax is used, the effect of improving the properties under low gloss image forming conditions due to the interaction between the linear polyester (A) and the low melting point wax (a) is impaired. In the present invention, the low melting point wax (a) is most preferably carnauba wax, and the high melting point wax (b) is most preferably a polyolefin wax such as polyethylene wax, polypropylene wax or oxidized polyethylene wax.

The effect of improving the properties by the interaction of the low-melting wax (a) with the linear polyester (A) and the non-linear polyester (B) of the high-melting wax (b)
It is preferable that these waxes have an average particle diameter of 0.2 μm or less and are dispersed in the fixing resin component in order to effectively exhibit the effect of improving the properties due to interaction with the wax. In addition, since these wax components are finely dispersed as described above, the OHP image characteristics are also improved, and an OHP image having a high transmittance can be formed on the OHP film, so that the OHP can be effectively used. it can.

Further, similarly to the above-mentioned polyester, it is necessary to use both the low-melting wax (a) and the high-melting wax (b) in an appropriate balance, and when one of them is used in an unnecessarily large amount, The properties derived from the other wax are impaired. Therefore, the low melting point wax (a) and the high melting point wax (b) are preferably used in a weight ratio of a: b = 7: 3 to 3: 7, particularly 6: 4 to 4: 6. Further, the amount of the release agent composed of these waxes (the total amount of the low-melting wax (a) and the high-melting wax (b)) is usually within the range of the fixing resin component 100.
It is preferably 5 to 15 parts by weight, particularly preferably 7 to 12 parts by weight per part by weight. That is, if the amount of the release agent used is larger than the above range, the offset resistance particularly when fixing is performed by an oilless fixing system is impaired, and when used in a larger amount than the above range, These release agent components are not uniformly dispersed in the fixing resin, causing variations in offset resistance and fixing property, and the charging characteristics of the toner may be unstable.

(Other toner compounding agents) In the toner of the present invention, a toner compounding agent known per se is dispersed and compounded in the fixing resin, in addition to the above-mentioned releasing agent. For example, a pigment of each color can be blended as a colorant according to the color of the target toner. Suitable examples include, but are not limited to: Colorant for black toner: carbon black, acetylene black, lamp black, aniline black and the like. Colorant for yellow toner: C.I. I. Pigment Yellow 1, C.I. I. Pigment Yellow 5, C.I. I. Pigment Yellow 12, C.I. I. Pigment Yellow 15,
C. I. Pigment Yellow 17, C.I. I. Pigment yellow 180, C.I. I. Pigment Yellow 74,
C. I. Pigment Yellow 4, C.I. I. Pigment Yellow 81, C.I. I. Pigment Yellow 97, C.I.
I. Azo pigments such as CI Pigment Yellow 93; inorganic pigments such as yellow iron oxide and loess; I. Nitro dyes such as Acid Yellow 1; I. Solvent Yellow 2,
C. I. Solvent Yellow 6, C.I. I. Solvent Yellow 14, C.I. I. Solvent Yellow 15, C.I.
I. Solvent Yellow 19, C.I. I. Oil-soluble dyes such as Solvent Yellow 21; Most preferred are C.I. I. And benzidine pigments such as CI Pigment Yellow 12. Colorant for magenta toner: C.I. I. Pigment Red 4
9, C.I. I. Pigment Red 57, C.I. I. Pigment Red 81, C.I. I. Pigment Red 122, C.I.
I. Pigment Red 184, C.I. I. Pigment Red 238, C.I. I. Solvent Red 19, C.I. I. Solvent Red 49, C.I. I. Solvent Red 52,
C. I. Basic Red 10, C.I. I. Disperse Red 15 etc. Most preferred are C.I.
I. Quinacridone pigments such as CI Pigment Red 122; Colorant for cyan toner: C.I. I. Pigment Blue 1
5, C.I. I. Pigment Blue 16, C.I. I. Solvent Blue 55, C.I. I. Solvent Blue 70, C.I.
I. Direct Blue 25, C.I. I. Direct Blue 86 etc. Most preferred are C.I. I. Pigment Blue 15 and the like. The colorant described above is used in an amount of 2 parts per 100 parts by weight of the fixing resin.
It is used in an amount of up to 20 parts by weight, in particular 5 to 15 parts by weight.

In the toner of the present invention, a nigrosine base (CI 50) is used to control the toner charge.
415), oil-soluble dyes such as oil black (CI 26150) and spirone black, and charge control agents such as metal complex salt dyes, metal naphthenates, fatty acid metal soaps, resin acid soaps, acrylic acid and methacrylic acid ester resins. Used as needed. Such a charge control agent can be generally added in an amount of about 0.5 to 10 parts by weight per 100 parts by weight of the fixing resin.

(Toner) The toner of the present invention is obtained by melt-kneading the above-mentioned various components, and pulverizing and classifying the obtained melt-kneaded product (resin composition for toner). It is used for full-color development as a two-component magnetic developer by mixing with a magnetic carrier. In order to finely disperse the release agent component, a part or all of the release agent component may be added and compounded at the stage of producing each polyester used as a fixing resin. The particle size of such toner is
In general, the thickness is preferably in the range of 5 to 20 μm, particularly 7 to 13 μm, and the surface of the toner particles is made of an inorganic oxide such as hydrophobic silica or TiO _{2 in} order to improve the fluidity. An agent can also be added externally.
Further, when used in a mixture with a magnetic carrier, it is preferable that toner: carrier = 3: 97 to 8:92 (weight ratio).

The toner of the present invention is charged into each developing device of a full-color image forming apparatus, charged to a positive polarity or a negative polarity, and applied to full-color development according to its color.
Such a toner exhibits excellent fixability and offset resistance under a wide range of fixing conditions. Therefore, in a full-color image forming apparatus using such a toner, the fixing conditions can be changed according to a user's request. For example, when forming a monochrome image using only black toner, the fixing speed (the peripheral speed of the fixing roller) is set to 100 to 200 mm / min.
Fixing pressure (pressure roller pressure) of 5 to 20 kg / cm ² ,
By setting the fixing temperature (fixing roller temperature) to about 100 to 160 ° C., a monochrome image having a glossiness (gloss) of 5 or less can be formed. The fixing speed (fixing roller peripheral speed) is set to 20 to 150 mm / min, the fixing pressure (pressure roller pressure) is set to 20 to 50 kg / cm ² , and the fixing temperature (fixing roller temperature) is set to about 160 to 220 ° C. Accordingly, a full-color image having a gloss of 25 or more can be formed. Further, since the toner of the present invention is remarkably excellent in offset resistance, it is possible to use an oilless fixing system in which the amount of oil applied to the fixing roller is reduced or the oil is not applied to the fixing roller at all.

[0025]

The present invention will be described with reference to the following experimental examples. (Experimental Examples 1 to 8) According to the formulation shown in Table 1, the linear polyester (A), the non-linear polyester (B), the low-melting wax (a) and the high-melting wax (b), and the polyester (A) and ( 5 parts by weight of cyan pigment (PB-51, manufactured by Dainippon Ink Co., Ltd.) per 100 parts by weight of the total amount
Parts by weight of positive charge control agent (P-51 manufactured by Orient Chemical Co.)
Was dry-mixed with a mixer, melt-kneaded with a heating roller, pulverized with an airflow pulverizer, and classified with an air classifier to prepare toner particles having an average particle size of 8.2 μm. As the linear polyester (A), those obtained by polycondensation of terephthalic acid (carboxylic acid component) and bisphenol A (alcohol component) and having different melting points (Tm) as shown in Table 1. The non-linear polyester (B) used is obtained by polycondensation of terephthalic acid with trimellitic acid (carboxylic acid component) and bisphenol A (alcohol component), and has various melting points (Tm). did. As the low melting point wax (a), carnauba wax having various melting points (Tm) is used, and as the high melting point wax, a melting point (Tm) is used.
m) different polyolefin waxes were used.
The toner particles obtained as described above were cut, and the cut surface was observed with an electron microscope to measure the average diameter of the wax component. The results are shown in Table 1. Also, using a flow tester (CFT500 type A manufactured by Shimadzu Corporation), test load: 20 kgf, die (nozzle): diameter 1 mm x length 1
mm, the softening temperature of the toner was measured under the conditions of a heating rate of 6 ° C./min. The results are shown in Table 1.

To 100 parts by weight of the toner particles obtained in each experimental example, 0.4 parts by weight of hydrophobic silica was externally added, and 5 parts by weight of this toner and 95 parts by weight of a ferrite carrier (manufactured by Powder Tech) were added. A developer was prepared by friction mixing. The developer prepared above was used in a commercially available copying machine (Kyocera Mita C
i-9500) was placed in a developing machine of a modified machine, and a blue single-color image was formed. The following evaluation was performed. The results are shown in Table 2. In this modified machine, soft rollers whose surfaces were formed of a fluorine-containing resin were used as upper and lower fixing rollers and pressure rollers, and images were formed without applying any oil to the fixing rollers.

Low gloss fixability: Using a gloss meter (PG-1M manufactured by Nippon Denshoku Co., Ltd.), the gloss value at a viewing angle of 60 ° was 5
Set the fixing conditions so that 0.7 mg
/ Cm ² is fixed with a solid image. The fixed image is exposed while applying a load of 400 g (cotton fabric).
Were evaluated by the image density (ID) ratio before and after rubbing five times. -Evaluation criteria- A: Greater than 95% B: 90 to 95% X: Less than 90%

High gloss smoothness: Fixing conditions were as follows: fixing roller peripheral speed: 70 mm / sec, fixing roller pressure: 20 kg / sec.
When the image was fixed by setting cm ² and the fixing roller temperature: 180 ° C., the gloss value (measured in the same manner as described above) of the obtained image was evaluated. -Evaluation criteria- ：: Greater than 30 ３０: 30 to 25 ×: Less than 25

Offset resistance: An image is fixed by changing the temperature of the fixing roller while keeping the peripheral speed of the fixing roller and the pressure of the fixing roller constant, so that winding around the fixing roller and toner adhesion to the fixing roller do not occur. The offset resistance was evaluated by measuring the temperature. -Evaluation criteria- A: Greater than 60 ° C ○: 40 to 50 ° C ×: Less than 40 ° C

OHP permeability: peripheral speed of fixing roller: 130 m
m / sec, fixing roller pressure: 20 kg / cm ² , fixing roller temperature: 160 ° C., and a solid image having a toner amount of 0.7 mg / cm ² is fixed on the OHP film. 50 with a spectrophotometer (Hitachi U-3210)
Evaluation was made based on the MAX value of the transmittance at 0 nm. -Evaluation criteria- ：: 60% or more ×: Less than 60%

Toner aggregability: When 10,000 images were continuously formed, evaluation was made based on the presence or absence of aggregation in the developing device. -Evaluation criteria- ○: No aggregation ×: Aggregation

[0032]

[Table 1] Polyester wax Wax softening (A) (B) (a) (b) Dispersion diameter Temperature experimental example 1 Tm = 105 ° C, 130 ° C Tm = 85 ° C, 140 ° C 0.2µm 118 ° C 50 parts 50 parts 5 parts 5 parts Experimental example 2 Tm = 90 ° C, 150 ° C Tm = 100 ° C, 150 ° C 0.2μm 140 ° C 20 parts 80 parts 3 parts 7 parts Experimental example 3 Tm = 90 ° C, 130 ° C Tm = 70 ° C, 130 ° C 0.2μm 110 ° C 50 parts 50 parts 5 parts 5 parts Experimental example 4 Tm = 105 ° C, − − 140 ° C 0.2 μm 108 ° C 50 parts 5 parts Experimental example 5 − Tm = 130 ° C Tm = 85 ° C, −0.3 μm 127 ° C 100 parts 5 parts Experimental example 6 Tm = 105 ° C, 130 ° C Tm = 85 ° C, 140 ° C 0.2μm 115 ° C 60 parts 40 parts 10 parts 5 parts Experimental example 7 Tm = 105 ° C, 130 ° C Tm = 65 ° C, 140 ° C 0.2μm 115 ° C 50 parts 50 parts 5 parts 5 parts Experimental example 8 Tm = 105 ° C, 130 ° C Tm = 85 ° C, 160 ° C 0.2 μm 118 ° C 50 parts 50 parts 5 parts 5 parts

[0033]

[Table 2] Low Gloss High Gloss Offset Resistance OHP Cohesive Fixing Smoothness Permeability Experimental Example 1 ◎ ◎ ◎ ○ ○ Experimental Example 2 ○ ◎ ◎ ○ ○ Experimental Example 3 ◎ ○ ◎ ○ ○ Experimental Example 4 × × × ○ ○ Experimental Example 5 × × × × ○ Experimental Example 6 ◎ ◎ ◎ × ○ Experimental Example 7 ◎ ◎ ◎ ○ × Experimental Example 8 ◎ × × ○ ○

[0034]

According to the present invention, a linear polyester (A) and a non-linear polyester (B) are used in combination as a fixing resin, and a low melting point of 70 to 100 ° C. is used as a release agent. Melting point wax (a) and melting point 110-1
By using in combination with the high melting point wax (b) at 50 ° C., under the low gloss image forming conditions, the interaction between the linear polyester (A) and the low melting point wax (a) can be used. In this case, the interaction between the non-linear polyester (B) and the high-melting polyester (b) exhibits excellent fixability and anti-offset properties, and any of monochrome images having low gloss to full-color images having high gloss can be obtained. It can be formed effectively. In addition, the toner of the present invention in which such a combination of polyester and wax is used can be effectively applied to an oilless fixing system, and can also effectively form an OHP image having a high transmittance.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koji Kuramasu 1-2-28 Tamazo, Chuo-ku, Osaka-shi F-term in Kyocera Mita Corporation (reference) 2H005 AA01 AA06 AA21 CA08 CA14 DA06 DA10 EA03 EA05 EA07

Claims (6)

[Claims] A fixing resin component comprising a linear polyester (A) and a non-linear polyester (B) has a melting point of 70%.
A toner for full-color development, wherein a release agent component comprising a low-melting wax (a) having a melting point of 1 to 100 ° C. and a high-melting wax (b) having a melting point of 110 to 150 ° C. is dispersed. 2. The full-color developing toner according to claim 1, wherein the release agent component is dispersed with an average particle size of 0.2 μm or less. 3. The full-color development according to claim 1, wherein the linear polyester (A) and the non-linear polyester (B) are used in a weight ratio of A: B = 2: 8 to 8: 2. For toner. 4. The melting point of the linear polyester (A) is as follows:
4. The full-color developing toner according to claim 3, wherein the non-linear polyester has a melting point of 120 to 160 ° C. 5. The low-melting wax (a) and the high-melting wax (b) are used in a weight ratio of a: b = 7: 3 to 3: 7. A release agent component comprising wax (b) and the fixing resin component 1
The full-color developing toner according to claim 1, wherein the toner is contained in an amount of 5 to 15 parts by weight per 00 parts by weight. 6. The full color developing wax according to claim 1, wherein the low melting wax (a) is carnauba wax, and the high melting wax (b) is a polyolefin wax.