JPH08110720A - Fixing method for full color toner image - Google Patents

Abstract

PURPOSE: To fix the transfer image of a full color image transferred to a transfer medium such as an OHP sheet or the like stably so as to obtain an excellent fixed image by forming the toner image through a toner using polyester resin, whose constituting component is a specified diol component, as a binder. CONSTITUTION: A toner-transferred transfer medium is interposed between both rolls of a fixing device and is pressed so as to perform fixing. The toner image is formed through a toner using polyester resin, whose constituting component is a diol component, in which melting point by a ring and a ball method is 100 to 120 deg.C, glass transition point is 55 deg.C or more, Gardner color scale is 2 or more, and haze value is 15 or less, shown by a formula, as a binder. In fixing the same, the fixing is performed as supplying organopolysiloxane containing a functional group with viscosity of 10 to 10O000cs at 25 deg.C to a roll on the side touching the toner image. In the formula, R expresses an ethylene group or a propylene group, and (x) and (y) are integers of one or more and satisfy the condition, 2<=x+y<=6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing a color toner image transferred to a transfer medium.

[0002]

2. Description of the Related Art In an image forming method of a full-color copying machine, color reproduction is carried out by using cyan, magenta, yellow and black toners. The following colors are obtained: In this case, for example, when a secondary color is obtained by superimposing two types of toner, the color difference from the actually obtained secondary color is determined by the transparency of the toner layer. That is, the fixing characteristics that the color toner should have are such that the color tone of the toner layer having a different color tone under the layer is not hindered, and the property that the toner melts quickly upon heating to prevent irregular reflection of light on the surface of the fixed image. is necessary. To achieve these, Japanese Patent Application Laid-Open Nos. 50-62442 and 50-63939.
And JP-A-51-24234 disclose a full-color toner using a polyester resin and a specific colorant, but in that case, there is a problem of occurrence of offset of a fixed image to a fixing roll. In order to solve the problem, it has been attempted to use a trivalent or higher acid or alcohol as a polyester monomer and control the viscoelasticity of the polymer to prevent offset. If it is too large, the sharp melt property will be impaired, and the color developability and the light transmittance of OHP will be deteriorated, making it unsuitable for practical use. Therefore, it is difficult to achieve both offset properties and OHP transparency.

Japanese Patent Application Laid-Open No. Hei 2-293867 discloses an attempt to solve the offset problem by using a combination of a sharp-melting polyester and a fixing device. For the purpose of (1), an excessive amount of silicone oil for imparting release properties must be supplied, and a large amount of oil is transferred onto the fixing medium (paper or OHP sheet) after fixing, and the fixing medium In such a case, it is difficult to write a pencil or a ballpoint pen on the fixing paper because of the transferred oil. Further, in the case of an OHP sheet, there remains a problem that light transmittance is inferior.

In addition to this, in a full-color toner, when the colorant is not well dispersed, color reproducibility and OH
The light transmittance of P deteriorates. As a method for improving this point, it has been proposed to use a colorant as a dye or to use a mixture of a dye and a pigment. However, the use of a dye improves color reproducibility and OHP light transmittance. Is inferior in weather resistance, causing a problem that the color tone of a full-color fixed image changes over time. Furthermore, when the vinyl chloride sheet containing the plasticizer comes into contact with the fixed image, the dye migrates to the vinyl chloride sheet, causing contamination of the vinyl chloride sheet. Further, when a polyester resin is used as a polymer for the toner, a sufficient fixed image characteristic required for a full-color toner can be provided, but when used in combination with a carrier, the polyester resin has a carboxyl at the molecular terminal. There is a problem that the temperature and humidity dependence of charging, which is considered to be caused by a group, a hydroxyl group or an ester bond between molecules, becomes large. Therefore, problems such as an excessive charge amount under low humidity and an insufficient charge amount under high humidity occur, and it is difficult to provide a color toner having a stable triboelectric charge amount in a wide range of environments.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. That is,
The problems to be solved by the present invention are as follows. That is, the shortcomings of the sharp melt polyester, which is optimal for achieving high color development, high gloss, and good OHP light transmission required for full-color toners, that is, the toner has high tackiness when melted Attributed to
Problems such as paper wrapping around the fixing roll and offsetting of the fixed image. In order to solve the above problems, a large amount of an oil-based offset preventing agent is currently supplied, but the resulting problem, namely, a large amount of the anti-offset agent transferred to the fixing medium, causes The problem is that post-writing with a pencil or pen becomes impossible, the light transmittance of the OHP sheet is reduced, or the exhibited anti-offset is dissipated outside the copier. A decrease in color developability resulting from poor dispersion of the pigment in the toner,
The problem of a decrease in light transmittance of OHP. Accordingly, it is an object of the present invention to provide a fixing method that solves the above-mentioned problems in the conventional technology.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a full-color toner image fixing method, in which a transfer medium on which a toner image has been transferred is inserted between two rolls of a fixing device comprising a pair of rolls and pressed. In the fixing method for fixing, the softening point of the toner image by the ring and ball method is 100 to 1
20 ° C., glass transition point of 55 ° C. or more, Gardner color number of 2 or less, and haze value of 15 or less.

[0007]

(Wherein, R represents an ethylene group or a propylene group, x and y each represent an integer of 1 or more, and 2 ≦ x + y ≦ 6). It is formed from a full-color toner in which a colorant is dispersed in a resin, and at least a roll of the following general formula (II)

[0009]

[In the formula, A is a group —R ¹ NH ₂ , —R ¹ NH
R ² NH _2, represents a -R ¹ _-O-Y f -H or -H (provided that, R ¹ and R ² are each carbon atoms 1-8
And an Y represents an alkyleneoxy group having 2 to 4 carbon atoms. ), B is 0 ≦ b ≦ 10, c is 10 ≦ c ≦ 1000, d is 2 or 3, e is 0 or 1, f is 0 ≦ f ≦ 10, and d + e = 3,
b and c cannot be 0 at the same time. ] Indicated by 2
It is characterized in that fixing is carried out while supplying a silicone composition containing a functional group-containing organopolysiloxane having a viscosity at 5 ° C. of 10 to 100,000 cs.

The present invention will be described in detail below. In the present invention, as a toner used for forming a full-color toner image, a toner in which a coloring agent is dispersed in a polyester resin is used. The bisphenol derivative represented by I) is an essential component. Further, together with the diol component of the general formula (I),
Ethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, diethylene glycol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, hydrogenated Bisphenol A, cyclohexanedimethanol and the like can be used in combination.

The acid component includes dicarboxylic acids,
For example, terephthalic acid, isophthalic acid, fumaric acid, succinic acid, acipic acid, sebacic acid and the like, and as the tricarboxylic acid, for example, trimellitic acid, pyromellitic acid and their acid anhydrides can be used.

The polyester comprising the diol component and the acid component has a softening point of 100 to 100 according to the ring and ball method.
120 ° C., preferably 105 ° C.
~ 115 ° C. If the softening point is higher than 120 ° C., the minimum fixing temperature becomes too high and the fixing roll temperature must be increased. The softening point is 100 ° C
If it is lower, toner blocking tends to occur.
On the other hand, when the Tg is lower than 55 ° C., toner blocking properties occur, and the storage stability becomes insufficient.

The measurement of the softening point of polyester by the ring and ball method may be carried out according to JIS K2207 (petroleum asphalt test method) 5.4. As a tester for evaluating this property, a ring and ball type automatic softening point measuring device manufactured by Meifou Seisakusho Co., Ltd. can be used.

[0015] The polyester resin must have a Kardner color number of 2 or less. By setting the Gardner color number to 2 or less, the polyester resin is almost completely free from coloring, so that it is possible to reduce the impact on light color reproduction such as yellow.

The measurement of Gardner color number is based on JIS K540.
0 (General test method for paint) It can be carried out by the method described in 4.1.2 method. Measurement by this method
The color of the sample prepared based on the specified method is indicated by the color number of the colored glass equal to the Gardner color number standard solution. That is, Gardner color number tube (inner diameter 10 mm, depth 110 mm
A colorless and transparent glass tube is sampled, and the color tube is heated to 160 ° C. to completely melt the resin into a transparent liquid, and then defoamed. The molten sample is set on a Gardner-Heliga colorimeter, the colorimetric plate is rotated, the color of the sample is compared with the color of the sample by transmitted light, and the number that appears in the window when the colors match is read.

The polyester resin has a haze value of 1
It must be 5 or less. The haze value is important as a quantitative measure of the transparency of the polyester resin. By setting the haze value to 15 or less, the transparency of the polyester resin is improved, and the impact on color reproducibility and the impact on OHP light transmittance can be reduced. Haze value is measured using a hazemeter as described in ASTM. As a test piece, scratches on the surface,
A product with no air bubbles inside is produced, and Pivotable-
Measure with a sphere hazemeter.

In the present invention, as the colorant, any known pigment can be used. Typical examples of pigments that can be used include organic pigments such as C.I. I. Pigment Red 57: 1, 6
4: 1, 81, 83, 114, 112, 122, 14
6, 170, 185; I. Pigment Blue 15:
3, 17: 1, 1, 15, 2; I. Pigment Yellow 12, 13, 17, 97, 1, 3, 55, 74, 8
1, 83, 120 and the like, and other organic pigments used for printing inks and the like can also be used. Of these organic pigments, those subjected to flushing treatment are particularly preferable. By performing the flushing process, the dispersion unit of the organic pigment in the toner becomes minute (0.3 μm).
m or less) and uniform dispersion. As a result, the decrease in light transmittance due to the coarsely dispersed particles of the organic pigment can be minimized, and the light transmittance of OHP can be improved, and the color reproducibility can be improved.

In the present invention, a black pigment such as carbon black can be used as the pigment. As carbon black, the average primary particle diameter is 35 to 80 mμ.
m, preferably 40 to 75 mμm.
The amount of carbon black added is usually in the range of 2.0 to 10% by weight, preferably 2.0 to 6.0% by weight. In the present invention, the toner used for forming a full-color image preferably has an average particle size of 5 to 9 μm. Further, it is preferable to use an external additive added to the toner.

As the external additive, amorphous titania, inorganic or organic spherical fine powder, or the like is used. Amorphous titania acts as a flow improver,
By subjecting the surface to a hydrophobic treatment with a coupling agent, the chargeability of the polyester resin is improved. Further, the inorganic or organic spherical fine powder exhibits the effect of improving development / transferability and cleaning. In particular, a particle size of 10 to 20 n
m amorphous titania and particle size 2
It is preferable to use an inorganic or organic spherical fine powder of 0 to 80 nm.

As the coupling agent used in the hydrophobizing treatment, those which efficiently react with the hydroxyl groups on the surface of the amorphous titania fine particles are preferably used. Examples of preferable coupling agents for increasing the bonding property with the surface include CH ₃ Si (NCO) ₃ and C ₁₀ H ₂₁ Si.
Examples include (OCH ₃ ) ₃ and CF ₃ Si (OCH ₃ ) ₃ .

The amorphous titania fine particles to be treated have the property that the surface hydroxyl value is higher and the reactivity with the coupling agent is higher than that of crystalline titanium oxide of rutile type or anatase type. Gives high chargeability,
In addition, the temperature and humidity dependency can be improved.
The particle size is such that the primary particle size is 1.0 μm or less, preferably 0.3 μm or less. The amount of these external additives added to the toner is 0.5 to 3% by weight, preferably 0.5 to 2% by weight in the case of amorphous titania, and 0.3 to 0.3% in the case of inorganic or organic fine particles. It is 3% by weight, preferably 0.5-2% by weight.

According to the present invention, a transfer medium carrying a toner image formed by the full-color toner is inserted between two rolls of a fixing device consisting of a pair of rolls and pressed against each other to perform fixing. At least one of the rolls of the apparatus that is in contact with the toner image has a viscosity of 10 at 25 ° C. represented by the general formula (II).
It is necessary to perform fixing while supplying a silicone composition containing a functional group-containing organopolysiloxane of 100,000 cs.

Examples of the functional group-containing organopolysiloxane represented by the above general formula (II) include the following structural formula (II
The one shown in I) is used.

[0025] (0 ≦ m ≦ 1,000, 0 ≦ n ≦ 1)

The above silicone composition has a viscosity at 25 ° C. of 10 to 1 represented by the following general formula (IV).
The 00000 cs organopolysiloxane can be blended in an amount of 0 to 10,000 parts by weight based on 100 parts by weight of the silicone composition represented by the general formula (II). R ₃ aSiO _z (IV) (In the formula, R ₃ is an alkyl group or an aryl group having 1 to 8 carbon atoms, a is 1.95 <a <2.20, and z = (4
-A) / 2. )

In the present invention, since the above-mentioned organopolysiloxane having a functional group has a high releasability-imparting ability, a small amount of a silicone composition containing the organopolysiloxane may be supplied to the fixing roll to offset the paper or wrap the paper. Can be prevented, and the transfer to the releasable fixing medium (paper or OHP) can be minimized, so that the fixed image can be postscripted with a pencil or a pen. Further, with respect to OHP, since the releasability of the fixing roll is increased, micro irregularities that diffusely reflect light on the fixed image surface are less likely to occur, and a fixed image having a flat surface structure can be formed. Light transmittance is improved. In the fixing device of the present invention, as the pair of fixing rolls, for example, a fixing roll that includes a heating roll having a heating source therein and that performs fixing by heat and pressure is preferably used.

The fixing device used in the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of one embodiment of the fixing device, FIG. 2 is a side view thereof, and FIG. It is a schematic diagram which shows a state. This fixing device
As shown in FIG. 2, a main part is constituted by a heating roll 1 and a pressure roll 2. The heating roll is configured such that an inner elastic layer 5 and an outer elastic layer 6 are provided on a substrate roll 4 having a heating source 3 therein. The pressure roll is configured such that an inner elastic layer 8 and an outer elastic layer 9 are provided on a substrate roll 7 having a heating source 18 therein. A release agent supply unit 13 is provided on one side of the heating roll 1. That is, the oil pan 15
Is supplied by a supply roll 16 onto a coating roll 17 provided in contact with a heating roll. Reference numeral 10 is a transfer sheet, and 11 is a toner image.

In this fixing device, the inner elastic layer 5 of the heating roll 1 and the inner elastic layer 8 of the pressure roll 2 are formed of synthetic rubber having the same rubber hardness. Since the elastic layer 5 is formed to be thinner, when the heating roll 1 and the pressing roll 2 are pressed against each other, as shown in FIG. The pressure roll 2 is pressed and deformed into a concave state, and a concave portion 12 is formed at a contact portion of the inner elastic layer 5 of the heating roll 1.

As described above, when the concave portion 12 is formed on the heating roll 1 side, when the transfer paper 10 passes through the nip portion between the heating roll 1 and the pressure roll 2, the transfer paper 10 It is deformed into the same shape as the concave portion 12 of the heating roll 1. Therefore, the peripheral speed of the transfer paper 10 becomes slower by an amount corresponding to the longer outer peripheral length of the concave-shaped heating roll 1 side than the undeformed pressure roll 2 side. When passing through the nip with the roll 2, a so-called “squeezing” force acts to separate the front side of the transfer paper 11 from the surface of the heating roll 1. Thus, the transfer paper 10 can be further separated without being wound around the heating roll 1. Therefore, it is possible to effectively prevent the transfer paper 10 from being wound around the heating roll 1 in a fixing device that fixes a color toner that has a large amount of toner and is easily offset. Further, as a means for supplying the silicone composition to the surface of the fixing roll,
As shown in the figure, the one in which the silicone composition 14 contained in the oil pan 15 is supplied by the coating roll 17 that contacts the surface of the fixing roll is used. However, the supply method is not limited to this, and the web impregnated with the silicone composition may be applied by a method such as contacting the surface of the fixing roll.

[0031]

【Example】

(Method of producing a pigment treated with flashin) [Production Example A] A water-containing paste of copper phthalocyanine (CI Vibration Blue 15: 3) obtained in a pigmentation step 42.9 parts by weight Polyester resin (bisphenol A) -Synthesized from ethylene oxide adduct, cyclohexane dimethanol and terephthalic acid; Ring and ball softening point: 105 ° C, Tg
= 60 ° C, Gardner chromaticity = 1, haze value = 8)
100 parts by weight The above components were kneaded with a kneader heated to 150 ° C., and the water in the pigment-containing paste was replaced with a molten polyester resin to obtain a resin-dispersed cyan pigment having a pigment content of 30% by weight. The resin-dispersed cyan pigment particles have a particle size of 0.05 to
The particles were uniformly dispersed in the range of 0.25 μm. This is designated as cyan flushing pigment a.

[Production Example B] Pigment paste was added to Carmine 6B.
Magenta flushing pigment b was obtained in the same manner as in Production Example A, except that the paste was replaced with C (CI Pigment Red 57: 1) aqueous paste. The dispersed particle size of the flushing pigment particles was in the range of 0.02 to 0.1 μm.

[Production Example C] A yellow flushing pigment was obtained in the same manner as in Production Example A, except that the pigment was replaced with a water-containing paste of Monomazo Yellow (CI Pigment Yellow 97). The dispersed particle size of the pigment particles of this flushing pigment was in the range of 0.2 to 0.3 μm.

(Production Example of Toner) [Production Example 1] 100 parts by weight of polyester resin (synthesized from bisphenol A / ethylene oxide adduct / cyclohexanedimethanol / terephthalic acid, ring-ball method softening point: 104 ° C., Tg = 60) C, Gardner chromaticity = 1, Haze value = 9) 16 parts by weight of cyan flushing pigment a The above components were mixed, melt-kneaded with an extruder, cooled, coarsely ground with a hammer mill, and reduced to 7 μm with an air jet type fine mill. The resultant was pulverized and classified to prepare a toner. To 100 parts by weight of the toner, 1.0 part by weight of amorphous titania (trade name: UFP, manufactured by Idemitsu Kosan Co., Ltd.) having a particle diameter of 15 μm and subjected to hydrophobic treatment with CH ₃ Si (NCO) ₃ and a flat diameter subjected to hydrophobic treatment Silica having a particle size of 40 μm (trade name: OX)
50, manufactured by Nippon Aerosil Co., Ltd.) and mixed with a high-speed mixer to obtain a toner composition A.

Production Example 2 100 parts by weight of polyester resin (synthesized from bisphenol A / ethylene oxide adduct-cyclohexanedimethanol-terephthalic acid, Ring and ball method softening point: 108 ° C., Tg = 62 ° C., Gardner chromaticity = 2, haze value = 7) Cyan flushing pigment a 16 parts by weight Toner composition B using the above components and in the same manner as in Production Example 1
I got

Production Example 3 100 parts by weight of polyester resin (synthesized from bisphenol A / ethylene oxide adduct-cyclohexanedimethanol-terephthalic acid, ring and ball method softening point: 113 ° C., Tg = 65 ° C., Gardner chromaticity = 1, haze value = 7) Cyan flushing pigment a 16 parts by weight Toner composition C using the above components and in the same manner as in Production Example 1
I got

Production Example 4 A toner composition D was produced in the same manner as in Production Example 2, except that the cyan flushing pigment a was replaced with the magenta flushing pigment b. [Production Example 5] A toner composition E was produced in the same manner as in Production Example 2, except that the cyan flushing pigment a was replaced with the yellow flushing pigment c.

[Production Example 6] 100 parts by weight of polyester resin (synthesized from bisphenol A / ethylene oxide adduct-cyclohexanedimethanol-terephthalic acid, ring and ball method softening point: 130 ° C, Tg = 67 ° C, Gardner chromaticity = 2, haze number = 7) Cyan Flushing Pigment a 16 parts by weight Toner composition F was prepared in the same manner as in Production Example 1 using the above components.
I got

[Production Example 7] A toner composition was prepared in the same manner as in Production Example 2, except that untreated copper phthalocyanine (CI Pigment Blue 15: 3) pigment was used as it was in place of the cyan flushing pigment a. G was obtained.

Example 1 Using toner compositions A and B, a carrier obtained by coating ferrite having a particle diameter of about 50 μm with 0.5 part by weight of a styrene / methyl methacrylate copolymer was used, and the toner concentration was 8 parts by weight. %, And a single-color mode copy test was performed with a copying machine (a modified full-color copying machine 6800 manufactured by Fuji Xerox Co., Ltd.) using the developer and the toner composition. As the fixing device, one having the configuration shown in FIGS. 1 and 2 was used.

The heating roll 1 is provided with a 500 W Colts lamp 3 therein, and is provided on the substrate roll 4 through a 44 mmφ outer diameter steel-type core material and an appropriate primer. 100 parts by weight of silicon compound (SH841U, manufactured by Toray Industries, Inc.) and 100 parts by weight of crystalline silica and 0.8 part by weight of a vulcanizing agent (RC-4, manufactured by Toray Industries, Inc.) are filled and mixed. Hardness is 60 ° in JIS hardness and thickness t is 3
mm inner elastic layer 5 and a fluorine-based rubber (for example, Paiton rubber (trade name) provided on the inner elastic layer 5:
It is formed by filling and mixing 100 parts by weight of DuPont B-50), 2 parts by weight of carbon (Cabot, Thermal Black MT) and 10 parts by weight of magnesium oxide (MgO: Kyowa Kagaku: # 30), and has a thickness t. Is composed of a 40 mm outer elastic layer 6.

On the other hand, the pressure roll 2 has a 500 W Colts lamp inside, and is provided on the substrate roll 7 with a 48 mm outer diameter steel-type core material and an appropriate primer via a primer. , 100 parts by weight of a silicon compound (SH841U, manufactured by Toray), 50 parts by weight of crystalline silica, and a vulcanizing agent (RC-4: manufactured by Toray) 0.8
The rubber hardness is determined by JI
An inner elastic layer 8 having an S hardness of 60 ° and a thickness t of 1 mm, and 100 weight of a fluorine-based rubber (for example, Paiton rubber (trade name): DuPont B-50) provided on the inner elastic layer 8 Parts and 2 parts by weight of carbon (Cabot, Thermal Black MT) and magnesium oxide (M
gO: 10 parts by weight of K30, manufactured by Kyowa Kagaku Co., Ltd., and mixed to form an outer elastic layer 9 having a thickness t of 40 mm. The heating roll 1 and the pressing roll 2 are pressed against each other by a pressing mechanism (not shown), and a nip width of 6 mm is formed at the center. Further, the heating roll 1 and the pressure roll 2 are adapted to rotate in the direction of the arrow at a surface speed of 150 / sec.

While supplying the amino-modified silicone oil represented by the formula (III) of m = 130 and n = 0.1 having a viscosity of 300 cs at 25 ° C. to the fixing device of the present invention,
The surface temperature of the pressure roller is fixed at 150 ° C., and the surface temperature of the fixing roll is changed from 120 ° C. to 240 ° C., and the minimum coloring temperature, the minimum fixing temperature, and the offset occurrence temperature using the toner compositions A, B, and C. Was evaluated. The paper peeling test was evaluated by fixing the surface temperature of the pressure roller to 150 ° C. and changing the surface temperature of the fixing roll from 120 ° C. to 180 ° C. For the transparency evaluation at the time of fixing the OHP sheet, the surface temperature of the pressure roller etc. is set to 150 ° C.
The surface speed of the fixing roll is set to 60 ° C, and the surface speed of the fixing roll is 50 mm / s.
ec and evaluated. The results obtained are shown in Table 1.

Example 2 Using toner compositions C, D and E, a developer was prepared in the same manner as in Example 1, and a copy test was conducted by changing the color mode to full color mode using a modified Fuji Xerox Copier 6800. As a result, even after copying 30,000 sheets, image troubles due to poor toner developability and transferability did not occur, and the problem of poor cleaning of the photoconductor did not occur. Also, neither a toner offset nor a paper wrap around the fixing roll occurred, and a beautiful and dense full-color image was obtained.

Example 3 Evaluation was performed in the same manner as in Example 1 except that the toner composition G was used. Comparative Example 1 Evaluation was performed in the same manner as in Example 1 except that the toner composition F was used. Comparative Example 2 Evaluation was made in the same manner as in Example 1 except that the amino-modified silicone oil was replaced with a dimethyl silicone oil having a viscosity of 300 cs at 25 ° C. and the toner composition A was used.

[0046]

[Table 1]

[0047]

The minimum color development temperature is the gloss of the copy measured by a gloss meter (Grossmeter manufactured by Gardner Co., USA: Glossguard II <
It means the temperature when the value measured by the incident / reflection angle of 75 °> becomes 40 or more. The high temperature offset temperature means a temperature at which the fixed toner transfers to the roll again. Character image minimum fixing temperature, after rubbing the fixed image by applying a constant load with a rubbing tester, evaluate the residual rate of the image,
It means the temperature when the remaining rate of the original character image is 70% or more. The paper peeling property was judged by the visual wrapping property of the paper on the roll. The paper used is 6 for thick paper.
It was 5 g / m ² , and in the case of thin paper, it was 56 g / m ² .

[Production Example 8] Polyester resin 97 parts by weight (synthesized from bisphenol A / ethylene oxide adduct-cyclohexanedimethanol-terephthalic acid, Ring and ball method softening point: 102 ° C, Tg = 58 ° C, Gardner chromaticity = 2, haze number = 6) Carbon black (manufactured by Cabot Co., REGAL99R 3 parts by weight, primary particle size 36 mμm) The above components are melt-kneaded by an extruder, cooled, coarsely crushed by a hammer mill, and air jet type fine pulverizer. 9 μm and pulverized to classify a toner, and 100 parts by weight of this toner is hydrophobized with CH ₃ Si (NCO) ₃ to obtain amorphous titania having a particle size of 15 μm (trade name:
UFP, manufactured by Idemitsu Kosan Co., Ltd., 0.7 parts by weight, and silica having a mean particle size of 40 μm, which is hydrophobized with hexamethyldisilazane (trade name: OX50, manufactured by Nippon Aerosil Co., Ltd.).
Toner composition H was prepared by adding 6 parts by weight and mixing with a high-speed mixer.
Was produced.

[Production Example 9] Polyester resin 97 parts by weight (synthesized from bisphenol A / ethylene oxide adduct-cyclohexanedimethanol-terephthalic acid) Ring and ball method softening point: 105 ° C., Tg = 61 ° C., Gardner chromaticity = 2, haze value = 9) Carbon black (manufactured by Mitsubishi Kasei Corporation, # 25, 3 parts by weight, average primary particle diameter: 47 mμm) In the same manner as in Production Example 8, a toner composition I was prepared.

Production Example 10 Polyester resin 96 parts by weight (synthesized from bisphenol A / propylene oxide adduct-fumaric acid-terephthalic acid, Ring and ball method softening point: 108 ° C., Tg = 62 ° C., Gardner chromaticity = 1, haze value = 8) Carbon black (manufactured by Cabot Corporation, BP160 4 parts by weight, primary particle diameter 50 mμm) A toner composition J was produced in the same manner as in Production Example 8.

[Production Example 11] Polyester resin 97 parts by weight (synthesized from bisphenol A / ethylene oxide adduct-cyclohexanedimethanol-terephthalic acid, Ring and ball method softening point: 113 ° C., Tg = 65 ° C., Gardner chromaticity = 1, haze value = 7) Carbon black (manufactured by Cabot Corporation, Black 3 parts by weight Pearls 280, primary particle diameter 41 mμm) A toner composition K was produced in the same manner as in Production Example 8.

[Production Example 12] Polyester resin 97 parts by weight (synthesized from bisphenol A / ethylene oxide adduct-cyclohexanedimethanol-terephthalic acid, Ring and ball softening point: 130 ° C, Tg = 67 ° C, Gardner chromaticity = 2, haze number = 7) Carbon black (manufactured by Cabot, Black 3 parts by weight Pearls 280, primary particle diameter 41 mμm) A toner composition L was prepared in the same manner as in Production Example 8.

Example 4 A developer was prepared using toner compositions HK in the same manner as in Example 1, and a copy test was performed in the same manner. The results are shown in Table 2. Comparative Example 3 Using toner composition L, a developer was prepared in the same manner as in Example 1 and a copy test was conducted in the same manner. The results are shown in Table 2. Although there is no problem in chargeability, the minimum fixing temperature was high, so that in the continuous copy test, the heat supply to the fixing roll was insufficient, and the gloss of the image changed to full color.

Comparative Example 4 A copy test was conducted in the same manner as in Example 1 except that the toner composition I was used and dimethyl silicone oil having a viscosity of 300 cs at 25 ° C. was used as a releasing agent to be supplied to the fixing roll. Table 2 shows the results. A larger amount of oil had to be supplied as compared with the amine-modified silicone oil, and post-writing by pen on fixed image paper could not be performed.

[0056]

[Table 2]

[0057]

According to the present invention, the above-mentioned configuration solves the problems in the case of using the conventional full-color toner, and prevents the paper from being wound around the fixing roll and the occurrence of offset of the fixed image. In addition, since a large amount of oil does not transfer to the fixing medium, a fixed image that can be post-written with a pencil or a pen can be obtained. Further, the disadvantages of polyester, such as a decrease in the density of a full-color image caused by charge fluctuation under high temperature and high humidity and low temperature and low humidity, and problems of toner cloud and fogging are solved, and a fixed image with good image quality can be obtained.
Therefore, the present invention is suitable for fixing a full-color toner image on a transfer medium such as an OHP sheet.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a fixing device used in the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a schematic view showing a deformed state of a roll during fixing.

[Explanation of Codes] 1 ... Heating roll, 2 ... Pressure roll, 3 ... Heating source, 4 ... Substrate roll, 5 ... Inner elastic layer, 6 ... Outer elastic layer, 7 ...
Substrate roll, 8 ... Inner elastic layer, 9 ... Outer elastic layer, 1
0: transfer paper, 11: toner image, 12: concave portion, 13: release agent supply means, 14: silicone composition, 15: oil pan, 16: supply roll, 17: application roll, 18 heating source.

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[Procedure amendment]

[Submission date] April 20, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

The above silicone composition has a viscosity at 25 ° C. of 10 to 1 represented by the following general formula (IV).
The 00000 cs organopolysiloxane can be blended in an amount of 0 to 10,000 parts by weight based on 100 parts by weight of the silicone composition represented by the general formula (II). (R ₃ ) _a SiO _z (IV) (wherein, R ₃ is an alkyl group or an aryl group having 1 to 8 carbon atoms, a is 1.95 <a <2.20, z = (4
-A) / 2. )

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

[0033] except that the Production Example C] pigment instead of water-containing pastes of mono A Zoiero (C.I. pixels Instrument Yellow 97), to give a yellow flashing pigment in the same manner as in Production Example A. The dispersed particle size of the pigment particles of this flushing pigment was in the range of 0.2 to 0.3 μm.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction content]

The minimum color development temperature is the gloss of the copy measured by a gloss meter (Grossmeter manufactured by Gardner Co., USA: Glossguard II <
It means the temperature when the value measured by the incident / reflection angle of 75 °> becomes 40 or more. The high temperature offset temperature means a temperature at which the fixed toner transfers to the roll again. Character image minimum fixing temperature, after rubbing the fixed image by applying a constant load with a rubbing tester, evaluate the residual rate of the image,
It means the temperature when the remaining rate of the original character image is 70% or more. The paper releasability was determined by visual observation of the winding of the paper around the roll. The paper used is 65 for thick paper
g / m ^2, in the case of thin paper it was of 56 g / m ^2.

[Procedure amendment]

[Submission date] April 4, 1994

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a fixing device used in the present invention.

FIG. 2 is a cross-sectional view of FIG. 1.

FIG. 3 is a schematic view showing a deformed state of a roll during fixing.

[Explanation of Codes] 1 ... Heating roll, 2 ... Pressure roll, 3 ... Heating source, 4 ... Substrate roll, 5 ... Inner elastic layer, 6 ... Outer elastic layer, 7 ...
Substrate roll, 8 ... Inner elastic layer, 9 ... Outer elastic layer, 1
0: transfer paper, 11: toner image, 12: concave portion, 13: release agent supply means, 14: silicone composition, 15: oil pan, 16: supply roll, 17: application roll, 18 heating source.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location G03G 15/01 J (72) Inventor Takashi Imai 1600 Takematsu, Minamiashigara-shi, Kanagawa Fuji Xerox Co., Ltd. Takematsu In-house (72) Inventor Susumu Saito 1600 Takematsu, Minamiashigara-shi, Kanagawa Fuji Xerox Co., Ltd.Takematsu In-house (72) Inventor Yoshio Shoko 2274 Hongo, Ebina-shi, Kanagawa Fuji-Xerox Co., Ltd. Person Yasuhiro Uehara 2274 Hongo, Ebina City, Kanagawa Prefecture Fuji Xerox Co., Ltd.Ebina Works (72) Inventor Masanori Ichimura 1600 Takematsu, Minamiashigara City, Kanagawa Fuji Xerox Co., Ltd. Takematsu Office (72) Inventor Asahiro Okawa Kanagawa 1600 Takematsu, Minamiashigara-shi, Japan Fuji Xerox Stock Association In the Takematsu Plant (72) Manabu Serizawa 1600 Takematsu, Minamiashigara City, Kanagawa Prefecture Fuji Xerox Co., Ltd.Takematsu Plant (72) Inventor, Yasuo Yamamoto 1600 Takematsu, Minamiashigara City, Kanagawa Fuji Xerox Co., Ltd. Takematsu Plant (72) Inventor Budo Man 1600 Takematsu, Minamiashigara City, Kanagawa Fuji Xerox Co., Ltd. Takematsu Plant (72) Inventor Satoshi Inoue 1600 Takematsu, Minami Ashigara City, Kanagawa Prefecture Fuji Xerox Co., Ltd. Takematsu Plant

Claims (1)

[Claims] 1. A fixing method in which a transfer medium on which a toner image has been transferred is inserted and pressed between both rolls of a fixing device composed of a pair of rolls to perform fixing, and the toner image has a softening point by a ring and ball method. 100-120 ℃, glass transition point is 5
The following general formula (I) having a Gardner color number of 2 or less and a haze value of 15 or less at 5 ° C. or higher. (In the formula, R represents an ethylene group or a propylene group,
x and y each represent an integer of 1 or more, and 2 ≦ x + y
≦ 6. ) Is formed from a full-color toner in which a colorant is dispersed in a polyester resin having a diol component as a constituent component, and a roll on the side in contact with the toner image has at least the following general formula (II) [In the formula, A is a group —R ¹ NH ₂ , —R ¹ NHR ² NH ₂ ,
Represents -R ¹ -O-Y _f -H or -H (provided that R
¹ and R ² each represent an alkylene group having 1 to 8 carbon atoms, and Y represents an alkyleneoxy group having 2 to 4 carbon atoms. ), B is 0 ≦ b ≦ 10, c is 10 ≦ c ≦ 1
000, d is 2 or 3, e is 0 or 1, f is 0 ≦ f
≦ 10 and d + e = 3, and b and c cannot be 0 at the same time. ] The fixing method is carried out while supplying a silicone composition containing a functional group-containing organopolysiloxane having a viscosity at 25 [deg.] C. of 10 to 100,000 cs.