JP2003307897A - Conductive blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductive blade with stable physical properties in which desired resistance can be stably obtained. <P>SOLUTION: The blade comprises a conductive blade member 11 made of a rubber elastic material containing at least one kind of ionic liquid as a conducting agent and a supporting body 12 supporting the conductive blade member. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive blade, and more particularly to an electrophotographic photosensitive member, a transfer drum and a transfer belt used in a transfer process, or a charging / charging device for an intermediate conveying belt.
The present invention relates to a cleaning blade used for static elimination / cleaning, a development blade used for a development process for flattening charges, static elimination and charging, and a conductive blade suitable for use as a toner regulating blade.

[0002]

2. Description of the Related Art In a dry developing method such as electrophotography or electrostatic recording, toner developed on a photoconductor is electrostatically transferred to paper in a transfer process, but all toner attached to the photoconductor is transferred. If the residual toner is carried over to the next cycle, the toner image interferes with the photodischarge of the photoconductor in the process of exposing the photoconductor, and the copy obtained as a result becomes an image defect. Therefore, a suitable image cannot be developed. Therefore, attach it to the photoreceptor
Various cleaning methods have been proposed to remove residual toner.

A method using a cleaning blade is also one of them, in which an elastic body such as rubber is brought into direct contact with a photosensitive member to scrape off the residual toner. In this method, the cleaning blade is arranged so that the lower end of the blade abuts on a horizontal line extending from the center of the photosensitive drum on the side that rotates upward, or a portion located slightly above the horizontal line, and the photosensitive drum rotates. As a result, the residual toner is scraped off.

By the way, a cleaning blade is usually attached to a metal support with a double-sided adhesive tape or a hot melt adhesive, but the electric resistance value of the entire cleaning blade is governed by the electric resistance value originally possessed by the polymer composition. In this case, the electric resistance value of the cleaning blade shows a high resistance value of 10 ¹² Ω or more, and it is not possible to remove the triboelectrification of the photoconductor and when it is continuously used for a long time. However, there is a problem of causing so-called toner scattering, which adversely affects the image (white streaks, unevenness), or causes the toner to spread to the back surface of the cleaning blade, and it cannot be said that the cleaning blade can be suitably used.

Further, recently, since the particle diameter of the toner is very small and the particle shape is close to a true sphere, it is becoming difficult to scrape the toner. Therefore, the material strength of the cleaning blade is increased and it is scraped off by pressure, the impact resilience at low temperature is high and the impact resilience does not depend on temperature, the blade itself has conductivity, and the toner is attracted by electrostatic force. , A method of repulsing and cleaning. From this point of view, it is necessary to make the cleaning blade conductive while maintaining the material strength as it is.

Therefore, in order to lower the electric resistance value of the cleaning blade, conductive carbon black is mixed in the composition to adjust the volume specific resistance value to 10 ⁴ Ω · cm or less, and the cleaning blade is used as a static electricity removing blade. A technique for doing so is known (for example, refer to Patent Document 1). However, since the volume resistivity value is configured to be 10 ⁴ Ω · cm or less, the electric charges existing except the site to be removed are also removed,
There is a problem that it is difficult to obtain a clear image. Further, the volume resistivity of the cleaning blade is set to 10 ³ to 10
^Even if the conductive carbon black is blended into the polymer to adjust the electric resistance value to ¹⁰ Ω · cm, the electric resistance value is significantly increased due to the dispersion state of the conductive carbon black and a slight difference in the addition amount. It tends to fluctuate, and when this is shifted to a mass production system, it becomes extremely difficult to supply a sheet having a stable electric resistance value. Also,
Addition of carbon black causes problems such as deterioration of mechanical properties, particularly compression set and permanent elongation, and increase of hardness.

On the other hand, in order to solve such a problem, thermoplastic resin polyurethane is blended with an ion conductive material such as lithium perchlorate, and an electric resistance value (25 ° C.) at a pressure voltage of 50 V is 10 ³ Ω to 10
A cleaning blade having a resistance of ¹⁰ Ω, preferably 10 ³ Ω to 10 ⁷ Ω is disclosed (for example, Patent Document 2).
reference). Thus, when an ionic conductive agent such as lithium perchlorate is added, there is an advantage that a blade having a medium resistance value of about 10 ⁶ to 10 ⁸ Ω is easily obtained.

A hybrid type conductive blade in which an electronic conductive type conductive agent such as conductive carbon black and an ion conductive type conductive agent composed of an alkali metal salt such as lithium perchlorate are combined is also known. (See, for example, Patent Documents 2 and 3).

[0009]

[Patent Document 1] JP-A-57-48766 (claims, etc.)

[Patent Document 2] Japanese Patent No. 3095193 (paragraph "0
011 ”etc.)

[Patent Document 3] Japanese Unexamined Patent Publication No. 2000-214659
(Paragraphs "0032" to "0035", etc.)

[0010]

However, when an ionic conductive agent such as lithium perchlorate is used, the electric resistance value is highly environmentally dependent, particularly humidity dependent, and when continuously energized, the electrical resistance is high. There is a problem that the value will rise. Also, the addition of an ionic conductive agent such as lithium perchlorate reduces the mechanical properties, especially the impact resilience,
Since the hygroscopic property is increased, there is also a problem that the hydrolysis property of polyurethane is deteriorated. Further, lithium perchlorate is dangerous in handling, and there is a problem that the number of added parts cannot be increased.

In view of such circumstances, it is an object of the present invention to provide a conductive blade which can stably obtain a desired resistance value and has stable physical properties.

[0012]

A first aspect of the present invention for solving the above-mentioned problems is to provide a conductive blade member made of a rubber-like elastic body containing at least one ionic liquid as a conductive agent, and this conductive material. A conductive blade comprising: a support that supports the blade member.

According to a second aspect of the present invention, in the first aspect, the rubber-like elastic body is made of polyurethane and has a volume resistivity of 1 × 10 ³ to 1 × 10 ¹⁰ Ω · cm. To the conductive blade.

In a third aspect of the present invention, in the first or second aspect, the ionic liquid has the following general formula (1) to
A conductive blade containing a cation selected from the group represented by (4).

[0015]

[Chemical 5]

(In the formula, R ₁ represents a hydrocarbon group having 4 to 10 carbon atoms, R ₂ and R ₃ represent hydrogen or an alkyl group having 1 to 8 carbon atoms, and may contain a hetero atom. Good, provided that the nitrogen atom contains a double bond, R ₃ is absent.)

[0017]

[Chemical 6]

(In the formula, R ₄ represents a hydrocarbon group having 2 to 10 carbon atoms, and R ₅ , R ₆ and R ₇ are hydrogen or 1 to 10 carbon atoms.
8 represents an alkyl group and may contain a hetero atom. )

[0019]

[Chemical 7]

(In the formula, R ₈ represents a hydrocarbon group having 2 to 10 carbon atoms, R ₉ and R ₁₀ represent hydrogen or an alkyl group having 1 to 8 carbon atoms and may contain a hetero atom. good.)

[0021]

[Chemical 8]

(In the formula, Q represents a nitrogen, phosphorus or sulfur atom, and R ₁₁ , R ₁₂ , R ₁₃ and R ₁₄ represent hydrogen or an alkyl group having 1 to 8 carbon atoms and include a hetero atom. However, if Q is a sulfur atom, there is no R _11. )

The fourth aspect of the present invention is any one of the first to third aspects.
In the embodiment, the ionic liquid is AlCl_Four ⁻,
Al_TwoCl₇ ⁻, NO_Three ⁻, BF_Four ⁻, PF₆ ⁻, CH
_ThreeCOO⁻, CF_ThreeCOO⁻, CF_ThreeSO_Three ⁻, (CF
_ThreeSO_Two)_TwoN⁻, (CF_ThreeSO_Two)_ThreeC⁻, AsF₆
⁻, SbF₆ ⁻, F (HF) n⁻, CF_ThreeCF_TwoCF _Two
CF_TwoSO_Three ⁻, (CF_ThreeCF_TwoSO_Two)_TwoN⁻, CF
_ThreeCF_TwoCF_TwoCOO ⁻Anion selected from
It is in the conductive blade characterized by including.

A fifth aspect of the present invention is the conductive blade according to any one of the first to fourth aspects, wherein the ionic liquid has a melting point of 70 ° C. or lower.

In the present invention, since an ionic liquid is added as a conductive agent, a desired medium resistance value can be stably obtained as compared with the case where conductive carbon is added, and lithium perchlorate is also added. Compared with the case of adding an ion conductive agent such as, the environmental resistance of the electric resistance value is low, especially the humidity dependence, and since there is no concern that hygroscopicity will rise, hydrolysis does not accelerate and mechanical properties Results in a conductive blade equivalent to the one without additives.

Here, the ionic liquid is a molten salt which is a liquid at room temperature, and is also called a room temperature molten salt, and particularly has a melting point of 70 ° C. or lower, preferably 30 ° C. or lower. Such an ionic liquid has properties such as no vapor pressure (nonvolatile), high heat resistance, nonflammability, and chemical stability.

Therefore, unlike an ionic conductive agent, there is little danger in handling, and since it is a liquid at room temperature, it can be easily added to rubber and the desired medium resistance can be easily obtained. Particularly, in the case of polyurethane, since it may be added as it is to the polyol which is the main raw material, there is an advantage that the addition is easy. Further, since it is not volatile, bleeding does not occur if it is compatible with the rubber even if the number of added parts is increased. In particular, when an ionic liquid that is not soluble in water (hydrophobic ionic liquid) is used, it does not increase the hygroscopicity of polyurethane, so it does not promote hydrolysis, has low humidity dependence, and has stable conductivity. It is thought that.

Ionic liquids that can be used in the present invention
Is a cation represented by the general formula (1) to (4) described above.
(Cationic), for example, imidazo
Cyclic amidine ions, such as the lithium ion, pyridinium
Ion, ammonium ion, sulfonium, phosphoni
It uses organic cations such as um ions as cations.
is there. As the anion, AlCl_Four ⁻, Al_TwoCl₇
⁻, NO_Three ⁻, BF_Four ⁻, PF₆ ⁻, CH_ThreeCOO⁻,
CF_ThreeCOO⁻, CF_ThreeSO_Three ⁻, (CF_ThreeSO _Two)_Two
N⁻, (CF_ThreeSO_Two)_ThreeC⁻, AsF₆ ⁻, SbF₆
⁻, F (HF) n ⁻, CF_ThreeCF_TwoCF_TwoCF_TwoSO_Three
⁻, (CF_ThreeCF_TwoSO_Two)_TwoN⁻, CF _ThreeCF_TwoCF
_TwoCOO⁻And so on.

As an example, there may be mentioned those comprising a combination of an organic cation represented by the following formula and a counter anion represented by the following formula.

[0030]

[Chemical 9]

Abbreviations in the formula EMI: 1-ethyl-3-methylimidazole BP: 1-butylpiperidine P12: N-ethyl-N-methylpyrrolidine

[0032]

[Chemical 10]

Abbreviations in the formula TFSI: bis {(trifluoromethyl) sulfonyl} imide

In the present invention, an ionic liquid compatible with the base rubber-like elastic body may be used and is not particularly limited. The mixing ratio is not particularly limited, but may be, for example, about 0.1 to 30% by weight with respect to the rubber-like elastic substrate.

Further, some ionic liquids are insoluble in water, and considering stability with respect to humidity,
It is preferable to use one that is insoluble in water.

The material of the rubber-like elastic body is not particularly limited as long as it is a rubber material that can obtain the characteristics according to the use, but polyurethane and silicone rubber are preferable from the viewpoint of contamination to the photoreceptor and other physical properties, and particularly, It is preferable to use polyurethane.

As the polyurethane, a cast-type liquid polyurethane is particularly preferable. Such polyurethanes include high molecular weight polyols, isocyanate compounds,
It can be obtained by thermosetting a chain extender, a cross-linking agent and the like. Examples of the polyol include polyester polyol, polycarbonate polyol, polyether polyol, polycarbonate ether polyol and the like. Further, as the isocyanate compound, 4,4′-diphenylmethane diisocyanate (MDI), 2,6-toluene diisocyanate (TDI), 1,5-naphthalene diisocyanate (TDI)
ODI), paraphenylene diisocyanate (PPD
I) and the like. Furthermore, as a chain extender,
Examples thereof include polyhydric alcohols such as butanediol, ethylene glycol, trimethylolethane, trimethylolpropane and glycerin. Moreover, as a crosslinking agent, an aromatic diamine type crosslinking agent can be mentioned, for example.

The conductive blade member using such polyurene can be molded by a known molding method such as centrifugal molding.

As the physical properties of such a conductive blade member, it can be mentioned that the conductive blade member has a hardness that does not damage the photoconductor, has little settling, and is excellent in abrasion resistance. The actual physical properties include hardness (JIS A) of 60 ° to 80 °,
The impact resilience is 40% to 60%, and the permanent set property is 3% or less.

The thickness of the conductive blade member is not particularly limited, but normally, a thickness of about 1 to 3 mm is preferably used.

The electrically conductive blade member of the present invention has an electric resistance value (25 ° C.) at an applied voltage of 100 V of 10 ³ Ω to ^{10 10} Ω, preferably 10 ⁴ Ω to 10 ⁸ Ω, although it varies depending on the application. The ionic liquid may be used, and the type and the addition amount of the ionic liquid may be set so as to obtain such a desired resistance value.

In the conductive blade member of the present invention, an electronic conductive agent such as carbon black or metal powder or an ionic conductive agent such as lithium perchlorate may be used in combination within the range not deviating from the object of the present invention.

In the conductive blade of the present invention, the portion of the conductive blade member, which is a blade-shaped sheet, opposite to the tip contacting the photosensitive member is fixed to the support.

FIG. 1 shows an example of the conductive blade of the present invention. As shown in FIG. 1, the conductive blade 10 has a support body 12 on the side opposite to the contact side of the conductive blade member 11.
It is fixedly supported on.

Here, the support is made of a metal material such as a steel plate or aluminum, and particularly, SECCP20 / 2.
0 (JIS G3313) known as electrogalvanized steel sheet type 1 is preferably used. In addition, SECC
SE20 of P20 / 20 indicates one type of galvanized steel sheet, and P indicates that it was subjected to phosphate treatment.
Indicates the standard adhesion amount on the upper surface of the stacked plates / the standard adhesion amount on the lower surface (g / m ² ), respectively.

The adhesion between the conductive blade member and the support is
It can be performed using an adhesive, a double-sided adhesive tape, or the like. For such adhesion, it is preferable to use an electrically conductive material that electrically conducts between the conductive member and the support, for example, a conductive adhesive is used. Conduction may be achieved by a paint, a conductive adhesive, a conductive sealant, or the like.

FIG. 2 shows an example of a state in which the conductive blade of the present invention is used as a cleaning blade. As shown in FIG. 2, the cleaning blade 10A is disposed inside the cleaning device 20, and the conductive blade member 11A is provided.
Is arranged so that the front end of the sheet comes into contact with the photosensitive drum 30. Such a conductive blade of the present invention is used for either trailing contact in which the rotation direction of the photosensitive drum 30 and the direction of the tip end substantially match as shown in FIG. 2 or opposite contact in which the photosensitive drum 30 contacts in the opposite direction. May be.

[0048]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on Examples, but the present invention is not limited thereto.

(Examples 1 to 5) As an ionic liquid, 1
-Ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide (EMITFSI) was used, and was added to 0.5 parts by weight, 1 part by weight, 3 parts by weight, and 5 parts by weight with respect to 100 parts by weight of the ester polyol. 10 parts by weight each, and further, a chain extender, a cross-linking agent and an isocyanate are added to cause a mixed reaction and a thickness of 2.0 m.
m urethane sheet was prepared.

(Examples 6 to 9) Instead of EMITFSI, 1-butyl-3-ethylimidazolium bis (trifluoromethylsulfonyl) imide (BMITFS) was used.
A urethane sheet was produced in the same manner as in Example 1 except that 0.5 parts by weight, 1 part by weight, 3 parts by weight, and 5 parts by weight of I) were used.

(Examples 10 to 13) Instead of EMITFSI, 1-butylpiperidinium bis (trifluoromethylsulfonyl) imide (BPTFSI) was added at 0.5%.
A urethane sheet was produced in the same manner as in Example 1 except that 1 part by weight, 3 parts by weight, and 5 parts by weight were used.

Examples 14 to 16 Instead of EMITFSI, N-butyl-N-methylpyrrolidinium bis (trifluoromethylsulfonyl) imide (P ₁₄ T
A urethane sheet was produced in the same manner as in Example 1 except that 0.5 parts by weight, 1 part by weight, and 3 parts by weight of FSI) were used.

Comparative Example 1 A urethane sheet was produced in the same manner as in Example 1 except that the ionic liquid was not added.

Comparative Example 2 A urethane sheet was produced in the same manner as in Example 1 except that 0.6 part by weight of Ketjen Black (manufactured by Lion Corporation) was added instead of the ionic liquid.

Comparative Examples 3 to 5 A urethane sheet was prepared in the same manner as in Example 1 except that 0.5 parts by weight, 1 part by weight, and 3 parts by weight of lithium perchlorate were added instead of the ionic liquid. It was made.

(Test Example 1) From the urethane sheets of Examples 1 to 16 and Comparative Examples 1, 2 and 5, 120 mm × 12
A test sample having a thickness of 0 mm and a thickness of 2.0 mm is prepared,
Low temperature and low humidity environment (LL) with a temperature of 10 ° C and a relative humidity of 20%,
Normal temperature and normal humidity environment (NN) with temperature 25 ° C and relative humidity 50%
The volume resistivity was measured in a high temperature and high humidity environment (HH) at a temperature of 35 ° C. and a humidity of 85%. The volume resistivity is measured by leaving each sample in a chamber under each environment for a predetermined time, then using a brass electrode and a current measuring device.
According to ISK 6723, a voltage of DC 100V was applied and the current value after charging for 1 minute was measured (for Comparative Example 2, 20V was applied). Then, the volume resistivity was calculated from the following formula. The main electrode has a diameter of 50 m.
m, height 35 mm, guard electrode outer diameter 80 mm, inner diameter 7
0 mm, height 10 mm, counter electrode 300 x 150 x 2 m
m was used.

[0057]

## EQU1 ## ρ = (πd ² / 4t) Rv ρ: Volume resistivity (Ω · cm) d: Diameter of main electrode (cm) t: Thickness of test piece (cm) Rv: Volume resistance (Ω)

The results are shown in FIGS.

As a result, in the example using the ionic liquid, the volume resistivity change was about one digit when the LL environment was changed to the HH environment.
Also, in Comparative Example 5 using lithium perchlorate, the volume resistivity when changing from the LL environment to the HH environment changed by two orders of magnitude. Therefore, the example using the ionic liquid was compared with Comparative Example 1 It was also found that the environmental dependence was smaller than that of Comparative Example 5. In Comparative Example 2 using carbon black, the volume resistivity value tended to increase when the LL environment was changed to the HH environment.

Test Example 2 Test samples prepared from the urethane sheets of Examples 1 to 5 and Comparative Examples 1, 2 and 5 in the same manner as in Test Example 1 were tested at a temperature of 35 ° C. and a relative humidity of 20%. The volume resistivity after changing to 90% and leaving for 5 hours in each environment was similarly measured.

The results are shown in FIG.

As a result, it was found that the humidity dependency was smaller when the ionic liquid was used than when lithium perchlorate was used.

(Test Example 3) With respect to test samples prepared from the urethane sheets of Example 4 and Comparative Examples 2 and 5 in the same manner as in Test Example 1, changes in volume resistivity when 100 V was continuously applied were measured. did. The results are shown in FIGS.

As a result, Example 4 using the ionic liquid
Then, as in Comparative Example 5 using lithium perchlorate and Comparative Example 2 using carbon black, no increase in volume resistivity was observed.

(Test Example 4) With respect to the test samples prepared in the same manner as in Test Example 1 from the urethane sheets of Examples 3, 8, 16 and Comparative Examples 1, 2, and 5, the capacitance was measured by the LCR meter. The relative permittivity was calculated from the following formula.
The measurement frequency range was 50 Hz to 1 MHz. The result is shown in FIG.

[0066]

[Equation 2]

As a result, in the example using the ionic liquid, unlike the comparative example 2 in which the carbon black was added, in which the relative permittivity was significantly increased, when the frequency was 10 kHz or higher, the comparative example in which no addition was made was made. It was found that the relative dielectric constant was the same as that of No. 1.

(Test Example 5) Examples 1 to 16 and Comparative Examples 1 to 1
5, hardness (JIS K6253 type A),
Rebound resilience (JIS K6255), Tensile strength at 100% elongation (100% modulus), Tensile strength at 200% elongation (200% modulus) Tensile strength at 300% elongation (300% modulus), Tensile strength And elongation at break (JIS K6251), tear strength (JIS K625
2), Young's modulus (JIS K6254) and 100% permanent elongation (JIS K6262) were measured.

The results are shown in Table 1.

As a result, in Comparative Example 2 in which carbon black was added, the permanent elongation deteriorated and the hardness became larger than that in the case of no addition, and the Young's modulus increased accordingly.
In Comparative Examples 3 to 5 using lithium perchlorate, the impact resilience tends to be particularly lowered, but in Examples 1 to 16 using the ionic liquid, the physical properties almost equal to those of the non-added ones may be exhibited. all right.

[0071]

[Table 1]

(Test Example 6) Examples 1, 4, 5 and Comparative Example 1
The hygroscopicity of the test samples prepared from the urethane sheets of to 5 in the same manner as in Test Example 1 was measured. Temperature 7
At 0 ° C. under vacuum, Examples 1, 4, 5 and Comparative Examples 1 to 5 were mixed with each other.
Let stand for a while, measure the weight in the dried state, then
The sample was left in a high temperature and high humidity environment of 45 ° C. and 90% for 1 day, and after 10 minutes and 60 minutes after returning to room temperature, the weight was measured, and the hygroscopicity of the material was measured from the difference. The result is shown in FIG.

The moisture absorption (%) was obtained from the difference between the weight when placed in a high temperature and high humidity environment and the weight when dried.

[0074]

[Equation 3] Moisture absorption (%) = (W ₁ −W ₀ ) / W ₀ × 100 W ₀ : Weight when dried W ₁ : Weight after left for 1 day in a high temperature and high humidity environment

As a result, in Comparative Examples 3 to 5 using lithium perchlorate, the moisture absorption increased as the amount added increased, but in Examples 1, 4 and 5 using the ionic liquid,
The moisture absorption did not change even if the added amount increased, and was about the same as Comparative Examples 1 and 2 in which the conductive agent was not added and carbon black was used.

(Test Example 7) Cleaning Property Test Using the cleaning blades made from the urethane sheets of Example 4, Comparative Example 2 and Comparative Example 4, the cleaning property was a temperature of 10 ° C. and a relative humidity of 20%. L
L), temperature 25 ℃, relative humidity 50% normal temperature and normal humidity environment (N
N), temperature 35 ° C, humidity 85% in high temperature and high humidity environment (HH), the print image is evaluated, and the presence or absence of jarring noise (squeaking) generated when the photoconductor drum and the cleaning blade rub against each other. Confirmation and observation of the edge wear state at the end of the test. The cleaning property was measured using a toner having an average particle size of 6 μm.

The cleaning characteristics and the quality of the squeal generation result were evaluated according to the following criteria. The results are shown in Table 2.

⊚: When the 40K test ended, no symptom to be evaluated was obtained, and a good result was obtained. ◯: The symptom to be evaluated did not occur at the end of the 40K test, but at that time, the life was almost expired. When judged to be △: When the symptom to be evaluated occurred during the 40K test ×: When the symptom to be evaluated occurred at the initial stage (test stage of 1K or less)

The evaluation items of the edge wear state at the end of the test were evaluated according to the following evaluation criteria. ◯: No chipping occurred Δ: Chipping that did not result in poor cleaning (3 μm or less) was found ×: Scratch that caused cleaning failure

[0080]

[Table 2]

From these results, it was found that the cleaning blade of Example 4 showed stable cleaning characteristics without defective cleaning or squealing up to 40K and had good edge durability.

On the other hand, in Comparative Example 5 using alkali metal ions, in the HH environment, cleaning failure occurred due to contamination of the photoconductor due to bleeding of ions. Further, in the LL environment, cleaning failure was shown at 3K due to uneven wear due to missing edges.

Comparative Example 2 using carbon black
Then, since the hardness is high under the LL-NN environment, 8K
A squeal started from just past. Further, in the LL environment, the hardness was high, and a chip with a diameter of 5 μm or more was generated at the edge, indicating poor cleaning.

[0084]

As described above, in the present invention, since the ionic liquid is used as the conductive agent, the desired resistance value can be set relatively easily, the physical properties are stable, and the urethane material of the base is used. Since the characteristics are not deteriorated, L
It is possible to provide a conductive blade capable of constantly maintaining good cleaning performance for spherical toner under the L to HH environment.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a conductive blade of the present invention.

FIG. 2 is a diagram showing an example of a usage mode of a cleaning blade which is an example of a conductive blade of the present invention.

FIG. 3 is a graph showing the results of Test Example 1.

FIG. 4 is a graph showing the results of Test Example 1.

FIG. 5 is a graph showing the results of Test Example 1.

FIG. 6 is a graph showing the results of Test Example 1.

FIG. 7 is a graph showing the results of Test Example 2.

FIG. 8 is a graph showing the results of Test Example 3.

FIG. 9 is a graph showing the results of Test Example 3.

FIG. 10 is a graph showing the results of Test Example 3.

FIG. 11 is a graph showing the results of Test Example 4.

FIG. 12 is a graph showing the results of Test Example 6.

[Explanation of symbols]

10,10A conductive blade 11, 11A conductive blade member 12 Support 20 Cleaning device 30 photoconductor drum

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazumi Kanai             2-3-3 Shirate, Tsurumi-ku, Yokohama-shi, Kanagawa               Hokushin Industry Co., Ltd. (72) Inventor Mayumi Nakao             2-3-3 Shirate, Tsurumi-ku, Yokohama-shi, Kanagawa               Hokushin Industry Co., Ltd. (72) Inventor Watanabe Masayoshi             2-190-3 Nishitobe-cho, Nishi-ku, Yokohama-shi, Kanagawa             −401 F-term (reference) 2H077 AD13 AE03 CA04 FA22 FA25                       GA02                 2H134 GA01 GA06 GA09 GA10 GB02                       HD03 HD19 KD08 KD12 KH01                       KH04                 2H171 FA25 FA26 FA30 GA24 GA27                       JA03 JA06 JA10 QC25 QC30                       TB13 UA03 UA12 UA22 XA06                       XA14                 2H200 FA01 FA18 GB12 JB42 JC12                       LB13 LB35 LB36 MA03 MA13                       MA20 MB04                 5G301 DA22 DA28 DA42 DA59 DD10

Claims (5)

[Claims] 1. A conductive material comprising a conductive blade member made of a rubber-like elastic body containing at least one ionic liquid as a conductive agent, and a support for supporting the conductive blade member. blade. 2. The rubber-like elastic body according to claim 1, which is made of polyurethane and has a volume resistivity of 1 × 10 ³ to 1 ×.
A conductive blade having a resistance of 10 ¹⁰ Ω · cm. 3. The conductive blade according to claim 1, wherein the ionic liquid contains a cation selected from the group represented by the following general formulas (1) to (4). [Chemical 1] (In the formula, R ₁ represents a hydrocarbon group having 4 to 10 carbon atoms,
R ₂ and R ₃ represent hydrogen or an alkyl group having 1 to 8 carbon atoms and may contain a hetero atom. However, when the nitrogen atom contains a double bond, there is no R ₃ . ) [Chemical 2] (In the formula, R ₄ represents a hydrocarbon group having 2 to 10 carbon atoms,
R ₅ , R ₆ , and R ₇ represent hydrogen or an alkyl group having 1 to 8 carbon atoms and may contain a hetero atom. ) [Chemical 3] (In the formula, R ₈ represents a hydrocarbon group having 2 to 10 carbon atoms,
R ₉ and R ₁₀ represent hydrogen or an alkyl group having 1 to 8 carbon atoms and may contain a hetero atom. ) [Chemical 4] (In the formula, Q represents a nitrogen, phosphorus, or sulfur atom, and R ₁₁ ,
R ₁₂ , R ₁₃ , and R ₁₄ represent hydrogen or an alkyl group having 1 to 8 carbon atoms, and may contain a hetero atom. However, when Q is a sulfur atom, there is no R ₁₁ . ) 4. The method according to claim 1, wherein
On-liquid is AlCl_Four ⁻, Al_TwoCl₇ ⁻, NO_Three
⁻, BF_Four ⁻, PF₆ ⁻, CH_ThreeCOO⁻, CF_ThreeCO
O⁻, CF_ThreeSO_Three ⁻, (CF_ThreeSO_Two)_TwoN⁻, (C
F_ThreeSO_Two) _ThreeC⁻, AsF₆ ⁻, SbF₆ ⁻, F (H
F) n⁻, CF_ThreeCF_TwoCF_TwoCF_TwoSO_Three ⁻, (CF
_ThreeCF_TwoSO_Two)_TwoN⁻, CF_ThreeCF_TwoCF_TwoCOO⁻
An anion selected from among
Electrical blade. 5. The conductive blade according to claim 1, wherein the ionic liquid has a melting point of 70 ° C. or lower.