JP3374861B2 - Charging member and charging device - Google Patents

Charging member and charging device

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Publication number
JP3374861B2
JP3374861B2 JP13325793A JP13325793A JP3374861B2 JP 3374861 B2 JP3374861 B2 JP 3374861B2 JP 13325793 A JP13325793 A JP 13325793A JP 13325793 A JP13325793 A JP 13325793A JP 3374861 B2 JP3374861 B2 JP 3374861B2
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JP
Japan
Prior art keywords
polyol
moisture
member
polyurethane resin
permeable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP13325793A
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Japanese (ja)
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JPH06348104A (en
Inventor
貴行 永瀬
新太 谷
誠 長谷川
Original Assignee
バンドー化学株式会社
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Filing date
Publication date
Application filed by バンドー化学株式会社 filed Critical バンドー化学株式会社
Priority to JP13325793A priority Critical patent/JP3374861B2/en
Priority claimed from EP94105863A external-priority patent/EP0620506A3/en
Publication of JPH06348104A publication Critical patent/JPH06348104A/en
Application granted granted Critical
Publication of JP3374861B2 publication Critical patent/JP3374861B2/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

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Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to an electrophotographic process or an electrophotographic process.
Is used in image forming processes such as electrostatic recording
The present invention relates to a charging member and a charging device to be used. [0002] 2. Description of the Related Art Conventionally, a band in an electrophotographic process has been used.
In the electric process, the shield plate is partially surrounded by
High voltage (5 to 8 kV DC) applied to the metal wire
The photosensitive member is charged by the generated corona. I
However, in this configuration, ozone and NO
The surface of the photoreceptor is altered by corona products such as x
Image blurring, deterioration, and wire contamination
Problems such as white spots and black streaks
You. On the other hand, in terms of electric power, the current flowing toward the photoconductor is 5 to 3 times.
It is only 0%, and almost all flows to the shield plate surrounding the wire.
Thus, the charging device is inefficient. In order to make up for these disadvantages, Japanese Patent Laid-Open No.
No. 78267, JP-A-56-104351.
Contact the charging member to the charged object such as the photoreceptor
Therefore, a configuration for directly charging is being studied. Conventionally, direct belt
(A) Carbon brass
NBR with low resistance particles such as
Rubber materials such as acrylic rubber and chloroprene rubber
A conductive rubber roller coated on the surface of the base, and (b) Japanese Patent Publication No. 50-13
No. 661 or nylon or
Rollers coated with polyurethane are known. [0004] However, the low resistance as in the former (a).
Conductive rubber roller with dispersed particles maintains its low resistance
Need to increase the amount of low resistance particles to be dispersed
The rubber hardness has increased and is more scattered on the surface.
Depending on the hardness of the low-resistance particles,
There is a problem that the surface is scratched. Such a wound
The image defects such as streaks occur when the image is stained. There
In order to solve this problem, add oil etc.
If the hardness is low, oil will
Problems such as exudation of the photoreceptor and contamination of the photoreceptor surface
is there. [0005] Further, nylon or the like as the latter (b)
Is the operating environment for rollers coated with polyurethane.
Changes, especially changes in atmospheric humidity,
Greatly changes the charging ability of the object to be charged.
Problems such as extremely low charging ability under low humidity
There is. When the charging ability decreases in this way, the
If uniform charging is not performed and an image is formed,
Degree and the reversal development method responds to uneven charging.
It becomes a spot-like black spot image (black spot), and white in the normal development method.
Black images (white dots), high quality images
An image cannot be obtained and environmental stability is poor. [0006] SUMMARY OF THE INVENTION It is an object of the present invention to provide a
Without adversely affecting the surface of the conductor
Provide a charging member and a charging device having excellent environmental stability
Is Rukoto. [0007] Another object of the present invention is to provide a non-uniform charging system.
Charging can be performed on the member to be charged.
Charging device and charging device capable of obtaining a stable image
To provide. Another object of the present invention is to provide a relatively low voltage
Charging member and charging device capable of charging an electric body
It is to provide. [0009] SUMMARY OF THE INVENTION The present invention provides a moisture-permeable polyurethane.
Permeable polyurethane with a surface layer made of urethane resin
Resins require polyols and polyisocyanates
Resin obtained by reaction in the presence of a chain extender.
This polyol converts ε-caprolactone into polyethylene.
This is a polyol that has been opened with ether glycol.
Of polyethylene ether glycol and ε in polyols
The weight ratio of the caprolactone component is 1/9 to 1/1
A charging member characterized in that: [0010] The present invention also relates to a moisture-permeable polyurethane resin.
And 100 parts by weight of this moisture-permeable polyurethane resin
Having a surface layer containing 2 to 50 parts by weight of blue,
The urethane resin requires polyol and polyisocyanate.
Resin obtained by reacting in the presence of a chain extender if necessary
Wherein the polyol converts ε-caprolactone to a poly
A polyol opened with ethylene ether glycol
The polyethylene ether glycol in this polyol
Weight ratio of ε-caprolactone component to 1/9 to 1/1
It is a charging member characterized by the following. [0011] The present invention also relates to a moisture-permeable polyurethane resin.
And poorly soluble in 100 parts by weight of moisture-permeable polyurethane resin
Having a surface layer containing 2 to 50 parts by weight of a water-soluble inorganic salt
Polyurethane resins are polyols and polyisocyanates
And, if necessary, in the presence of a chain extender.
Ε-caprolactone
With polyethylene ether glycol
Polyethylene ether group in this polyol.
The weight ratio of recall and ε-caprolactone component is 1/9 to
It is a charging member characterized by being 1/1. In the present invention, the polyol has a molecular weight of 10
It is in the range of 00 to 3000. The present invention also relates to a moisture-permeable polyester-based poly
It has a surface layer made of urethane resin,
Polyol polyurethane resin is composed of polyol and polyisocyanate.
Reaction with a chain, if necessary, in the presence of a chain extender.
This succinic acid and die
Polyester system by condensation reaction of tylene glycol
The charging member is a polyol. The present invention also relates to a moisture-permeable polyester-based poly
Urethane resin and moisture-permeable polyester polyurethane
Surface containing 2 to 50 parts by weight of navy blue for 100 parts by weight of fat
Having a layer, the moisture-permeable polyester-based polyurethane resin
Chain extension of polyol and polyisocyanate as necessary
A resin obtained by reacting in the presence of a long agent,
The polyol is a condensation reaction between succinic acid and diethylene glycol.
Is a polyester-based polyol
This is a charging member. The present invention also relates to a moisture-permeable polyester-based poly
Urethane resin and moisture-permeable polyester polyurethane
100 parts by weight of fat and 2 to 50 parts by weight of poorly water-soluble inorganic salt
, Having a surface layer containing
Resin requires polyol and polyisocyanate
Resin obtained by reacting in the presence of a chain extender
Therefore, this polyol is composed of succinic acid and diethylene glycol.
Polyester polyols obtained by the condensation reaction of
The charging member is characterized in that: The present invention also relates to a polyester polyol
Is characterized by having a molecular weight in the range of 600 to 3000.
I do. In the present invention, the poorly water-soluble inorganic salt is phosphoric acid
Calcium, barium sulfate, calcium sulfate, bali carbonate
Of calcium, calcium and magnesium carbonate
One or more selected from a group
I do. The present invention also provides (a) a member to be charged; (B) a charging member, (b1) a metal supporting member
(B2) provided on the outer peripheral surface of the support member to have elasticity.
And (b3) an outer peripheral surface of the intervening layer.
Contains moisture-permeable polyurethane resin and comes in contact with the charged object
And the moisture-permeable polyurethane resin comprises a polyol and a polyether.
The isocyanate is reacted in the presence of a chain extender if necessary.
And the polyol is ε-
Caprolactone opened with polyethylene ether glycol
This is a cyclic polyol, and the polyethylene in this polyol is
Weight of len ether glycol and ε-caprolactone component
A surface layer having a quantitative ratio of 1/9 to 1/1, and a roll shape
A charging member formed on the (C) a power supply for applying a voltage between the member to be charged and the support member
And a charging device. The present invention also provides (a) a member to be charged; (B) a charging member, (b1) a metal supporting member
(B2) the base end portion is fixed to the support member, and has elasticity.
And (b3) an outer peripheral surface of the intervening layer.
It contains moisture-permeable polyurethane resin and has a free end of the intervening layer.
Close contact with the member to be charged, the moisture permeable polyurethane resin
Can be used, if necessary, with a polyol and a polyisocyanate.
A resin obtained by reacting in the presence of a chain extender,
This polyol converts ε-caprolactone into polyethylene
This is a polyol that has been opened with ether glycol.
Polyethylene ether glycol in riol and ε-
Surface with a weight ratio of prolactone component of 1/9 to 1/1
Layer, a charging member formed in a blade shape, (C) a power supply for applying a voltage between the member to be charged and the support member
And a charging device. The present invention also provides (a) a member to be charged; (B) a charging member, (b1) a metal supporting member
(B2) provided on the outer peripheral surface of the support member to have elasticity.
And (b3) an outer peripheral surface of the intervening layer.
Containing a breathable polyester-based polyurethane resin,
The moisture-permeable polyester-based polyurethane resin
Resin requires polyol and polyisocyanate
Resin obtained by reacting in the presence of a chain extender
Therefore, this polyol is composed of succinic acid and diethylene glycol.
Polyester polyols obtained by the condensation reaction of
Charging member formed in a roll shape having a surface layer
When, (C) a power supply for applying a voltage between the member to be charged and the support member
And a charging device. The present invention also provides (a) a member to be charged; (B) a charging member, (b1) a metal supporting member
(B2) the base end portion is fixed to the support member, and has elasticity.
And (b3) an outer peripheral surface of the intervening layer.
Containing moisture-permeable polyester-based polyurethane resin,
In contact with the charged object near the free end of the layer, the moisture-permeable polymer
Ester polyurethane resin is composed of polyol and polyiso
Reaction with cyanate, if necessary, in the presence of a chain extender
Resin obtained by succinic acid
Made by the condensation reaction of diethylene glycol with diethylene glycol
Having a surface layer that is a ter-based polyol,
A charging member to be formed; (C) a power supply for applying a voltage between the member to be charged and the support member
And a charging device. [0022] According to the present invention, at least the surface of the charging member is provided.
The layer is made of breathable polyurethane resin or breathable polyester.
Or a polyurethane based resin
Breathable polyurethane resin or breathable polyester resin
Navy blue or poorly soluble in 100 parts by weight of urethane resin
And 2 to 50 parts by weight of an inorganic salt. Breathable polyurethane
Resins require polyols and polyisocyanates
Resin obtained by reaction in the presence of a chain extender.
This polyol converts ε-caprolactone into polyethylene.
This is a polyol that has been opened with ether glycol.
Of polyethylene ether glycol and ε in polyols
The weight ratio of the caprolactone component is 1/9 to 1/1
You. A table that achieves both water swelling resistance and moisture permeability
A face layer is realized. Polyethylene ether in polyol
Weight ratio of the glycol and ε-caprolactone components is 1 /
Excellent moisture permeability and resistance to water swelling when in the range of 9 to 1/1
A moisture-permeable polyurethane resin having wettability is obtained. Po
Weight ratio of ethylene ether glycol is less than the above range
, The water swelling resistance is good, but the moisture permeability is not sufficient.
Minutes, while polyethylene ether glycol is
Above this range, water swelling is sufficient but water swelling
Problems arise. The molecular weight of the polyol is from 1000 to 300
It is preferable that the molecular weight is less than the above range.
If it is, the elastomer performance will deteriorate, especially the cold resistance characteristics will deteriorate.
Cracks when used in cold climates
It is not preferable in terms of impairing the property, etc.
Exceeding the range greatly narrows the synthesis conditions,
No. Moisture-permeable polyester polyurethane resin
Can be used, if necessary, with a polyol and a polyisocyanate.
A resin obtained by reacting in the presence of a chain extender,
This polyol is a condensation of succinic acid and diethylene glycol.
It is a polyester polyol formed by a reaction. The molecular weight of the polyester polyol is 6
It is preferably in the range of 00 to 3000, for the reason
Are the same as the characteristics related to the molecular weight of the polyol described above.
You. Such a moisture-permeable surface layer of the charging member
The reason for this is that synthetic resin that does not have moisture permeability
Compared to a charging member having only a surface layer, the moisture permeable
Charging members made of conductive polyurethane resin are subject to environmental changes
The change in charging ability with respect to
This is because it becomes possible. The reason for this is not clear,
The charging member having a moisture-permeable polyurethane resin in the surface layer is
Ability to keep moisture absorption constant in response to environmental changes
Has, that is, kept moderate moisture in the surface layer,
Therefore, a charging member with excellent environmental stability is considered to be realized.
available. Especially at low temperature and low humidity, generally good discharge is performed.
Although it is difficult to perform
Always good by using moisture permeable polyurethane resin
Discharge can be generated. As a result, the charging ability
Stable and uniform discharge without charge unevenness
Becomes Polyisocyanate to be reacted with the above polyol
As the nate, for example, preferred are 4,
4'-diphenylmethane diisocyanate (MDI),
Hydrogenated MDI, isophorone diisocyanate, 1,3-
Xylylene diisocyanate, 1,4-xylene diisocyanate
Socyanate, 2,4-tolylene diisocyanate,
2,6-tolylene diisocyanate, 1,5-naphthali
Diisocyanate, m-phenylene diisocyanate
And p-phenylene diisocyanate, etc.
Is a combination of these organic polyisocyanates and low molecular weight
To make the terminal isocyanate
Naturally used urethane prepolymer etc. obtained by reaction
can do. As the chain extender, for example, preferred
As for ethylene glycol, propylene glycol
, Diethylene glycol, 1,4-butanediol,
1,6-hexanediol, ethylenediamine, 1,2
-Propylene diamine, trimethylene diamine, tetra
Methylene diamine, hexamethylene diamine, decamethi
Rangeamine, isophoronediamine, m-xylylenediene
Amines, hydrazine, water and the like. In producing a moisture-permeable polyurethane resin
For example, if necessary, in an appropriate organic solvent,
Using a medium, the equivalent ratio of each raw material is set to NCO / OH = 0.9 to
The reaction may be adjusted to about 1.1 or
You may make it melt-react with a solvent. In addition, all ingredients are
Or use the so-called prepolymer method.
You may. The molecular weight of the polyurethane resin is not particularly limited.
But not in a layer, that is, as a surface layer of the charging member.
Considering the strength of the film and the film forming processability, melting at 200 ° C
The range of 4000 to 10,000 poise is preferable in terms of viscosity.
New The above-mentioned polyurethane resin is applied to the surface layer of the charging member.
As a method for forming a fat, polyurethane resin is added to DM
F in a solvent such as F
-Known coating, dipping coating methods, etc.
Can be formed. Although the thickness of the obtained surface layer is arbitrary,
5 to 500μ in consideration of useful strength and moisture permeability
A thickness of about m is preferred. The surface layer containing the moisture-permeable polyurethane resin is
20μm thick and complies with Japanese Industrial Standard JIS Z-0208
It is preferable that the moisture permeability is 2,000 or more, as described below.
It is preferable that the degree of water swelling defined by Formula 1 is 5 or less.
No. The degree of water swelling is determined by measuring the moisture permeable polyurethane resin film by 5
Cut to a size of × 5cm, and oppose each other on this film
A 5 cm long line was drawn at the center of the film in the corner direction.
This film is immersed in a petri dish containing warm water at 40 ° C.
The elongation of the line after 5 minutes was measured, and the
The degree of moisture was calculated. [0034] (Equation 1) The above-mentioned moisture-permeable polyurethane resin or moisture-permeable
Navy blue or mixed with polyester polyurethane resin
Is a poorly water-soluble inorganic salt per 100 parts by weight of such a resin.
Navy blue or 2 to 50 parts by weight of a poorly water-soluble inorganic salt.
Preferably 10 to 30 parts by weight, particularly preferably about 30 parts by weight
Department. Navy blue or poorly water-soluble inorganic salt less than 2 parts by weight
If not, no further effect on environmental changes can be expected,
When the amount is more than 50 parts by weight, the strength of the surface layer 4 becomes weak.
Wasteful. Dark blue is a solid pigment powder,
Breathable polyurethane by kneading urethane resin and navy blue
Navy blue disperses in the resin. Such a dark blue color is
By mixing with polyurethane resin, only synthetic resin
Compared to a charging member having a surface layer of the charging portion of the present invention
The material has a very small change in charging ability with environmental changes.
Thus, it is possible to stabilize. The reason for this is clear
Not that, but blue blue always absorbs moisture even when the environment changes
Has the ability to maintain a constant
Electrification that keeps moisture moderate and therefore has excellent environmental stability
It is considered that a member for use is realized. Breathable polyurethane
Even charging members with a surface layer consisting of resin alone
Enables relatively good discharge under low humidity conditions
However, in the present invention, as described above,
With this, even if it becomes severe low temperature and low humidity, always good
It is possible to generate electricity. As a result, the charging ability is low.
Constant and uniform discharge without charge unevenness
Become. This means that the moisture-permeable polyester polyurethane
The same applies to resin. Instead of navy blue, as a poorly water-soluble inorganic salt,
Calcium sulfate, barium sulfate, calcium sulfate, carbonic acid
Barium, calcium carbonate and magnesium carbonate
One or more of these may be used.
It is considered that water salt is hydrophilic and works effectively like navy blue.
available. [0038] Such a charging member is used as a metal supporting member.
Through an elastic interlayer such as conductive rubber.
Then, forming the surface layer to form a charging roll
The surface layer may be formed to form a charging roll.
Alternatively, the charging member may be
It may be formed in a contacting blade shape. The surface layer and the coating
A voltage of, for example, 600 to 2000 V is applied between the
From the source, the above-mentioned discharge is performed, and the charged object is charged.
Can be [0039] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a roll type charging device according to an embodiment of the present invention.
It is sectional drawing of a member. This charging member 1 is shown in FIG.
Electronic copying for image formation such as copying machines or recording devices
Suitable for true process or electrostatic recording process
Can be Touches the outer peripheral surface of the right columnar electrophotographic photosensitive member 11
The charging member 1 according to the present invention is provided by touching,
The exposure unit 5 slides the charged photoreceptor 11
Exposure to form an electrostatic latent image.
The electrostatic latent image is visualized as a toner image by the
2 is transferred to the recording paper 7 by the transfer charging member 8.
Thus, the toner image is transferred to the recording paper 7. On the photoconductor 11
The remaining toner is removed by the cleaning means 9.
It is. When charging the photoconductor 11 with the charging member 1,
When a residual potential exists on the photoconductor 11, a pre-exposure unit
Light is applied to the photoconductor 11 by 10 to remove the residual potential.
You had better. In the charging member 1 shown in FIG.
A right columnar shape whose right angle cross section is a uniform circular shape in the axial direction or
A rotatable conductive metal that is a straight cylinder
An elastic conductive material is provided on the outer peripheral surface of the
The layer 3 is fixed, and the outer peripheral surface of the intervening layer 3 is in accordance with the present invention.
The surface layer 4 is formed. The support member 2 is made of iron, copper,
It is made of metal such as stainless steel. As the intervening layer 3, carbon black, gold
Rubber with low resistance particles such as metal powder dispersed and adjusted to be conductive
Form the material. Natural rubber, chlorop
Ren rubber, styrene / butadiene rubber, ethylene / pro
Pyrene rubber, butyl rubber, acrylic / nitrile / butadi
En rubber, silicone rubber, urethane rubber, fluoro rubber,
Halogenated butyl rubber, chlorosulfone polyethylene
For rubber, hydrogenated nitrile rubber, epichlorohydrin, etc.
Bridge rubbers and their copolymers, blends, and
Liolefin, polyester, polyether, poly
Thermoplastic elastomers such as lamide and polyurethane
Etc. can be appropriately selected. Also, if necessary
These include aromatic, naphthenic and paraffinic oils.
Mineral oil and di- (2-ethylhexyl) phthalate
(DOP), di- (2-ethylhexyl) adipate
(DOA), di- (2-ethylhexyl) sebacate
(DOS) and vegetable oils such as rapeseed oil and coconut oil.
Any softener may be used. Other rubber chemicals, rubber additives
Vulcanizing agents such as sulfur and peroxide, stearic acid
Vulcanization accelerators such as zinc, sulfenamides, thiuram
Thiazole, guanidine, etc.
Antioxidants such as phosphorus-based, phenol-based, sulfur-based, and phosphorus-based antioxidants,
Optional inorganic fillers such as reinforcing agents, silica, talc, clay
Can be selected. The conductive rubber forming the intervening layer 3 is made of oil.
Low hardness (for example, 30 to 45 degrees) and elasticity
Having. In manufacturing the surface layer 4, first,
Polyurethane resin or polyester with moisture permeability
Dissolve polyurethane resin and add carbon black
Disperse low resistance particles such as6-1012 Ω · cm
Adjust so that it becomes a resistance. In forming the surface layer 4
(A) moisture permeable polyurethane prepared as described above
Resin or moisture-permeable polyester polyurethane resin,
It coats on the intervening layer 3. Coating is a dip coating method,
Using coating methods such as spray coating
It can be carried out. The thickness of the surface layer is 5 to 200 μm.
20 to 150 μm is preferable. As another embodiment, in forming the surface layer 4,
(B) moisture permeable polyurethane adjusted as described above
For tan resin or moisture-permeable polyester polyurethane
Navy blue or poorly water-soluble inorganic salt is added to the resin in the above weight ratio.
Add, disperse with a ball mill, etc., and coat on intermediate layer 3
I do. The surface layer 46-1012Ω · cm low resistance
The reason for adjusting the resistance is that dielectric breakdown of the charged body such as the photoconductor 11 is performed.
This is because it is effective against breakage. That is, contact charging
When charging, the charging member placed in contact with the photoconductor
When a pressure is applied, defective parts inside the photoconductor
Resulting in. Therefore, the charging of the photoconductor 11 becomes uneven.
And excessive current flows from the charging member to the breakdown point.
As a result, the voltage applied to the charging member drops. This
As a result, poor charging occurs over the entire photoconductor contact area.
In the case of the regular developing method, the white band, and in the reverse developing method, the black band
Appears. To prevent these, charging members
It is desirable that the voltage applied to the
In order to perform uniform charging by applying a voltage, the charging member 1
It is necessary to keep the surface layer of the low resistance. A high voltage is applied by the DC power supply 13.
Then, many products such as ozone and NOx are generated during charging
As a result, the object to be charged such as the photoreceptor 11
And adverse effects such as image deletion. In view of the above, the present invention provides a moisture permeable
Polyurethane resin or moisture-permeable polyester polyurethane
Surface with navy blue or poorly water-soluble inorganic salt dispersed in tin resin
Since the charging member 1 has the layer 4,
To the required amount of low-resistance substances such as carbon black.
Can easily control the resistance.
Increase the hardness by adding oil to the inner conductive rubber layer.
Control to low hardness easily by
There is no particular problem because it can be rolled. More than
Therefore, the voltage applied to the charging member 1 of the present invention is ±
A low voltage of 600 V to ± 2000 V
The charged body can be charged sufficiently uniformly. One electrode of the DC power source 13 is connected to the support member 2.
Connected and the other electrode is grounded. The photoconductor 11 is made of gold
Structure in which an electrically insulating photosensitive layer is formed on the surface of a metal straight cylinder
The tube is grounded and the other electrode of the power supply 13
Connected to. FIG. 3 shows the embodiment shown in FIGS.
5 is a graph showing experimental results by the present inventor. Power supply
13, the voltage applied to the charging member 1 and the charging member
1 shows the surface potential of the photoconductor 11 charged by the reference numeral 1. La
Inn L1 is used under normal temperature, normal humidity, and high temperature and high humidity environments.
The line L2 has low temperature and low humidity (for example, 10
° C, 30% RH relative humidity) and high temperature and low humidity characteristics
Is shown. When the applied voltage is, for example, V1 = 1400 V
In this case, the voltage ΔV of the difference between the lines L1 and L2 is, for example, 30
V, and it was confirmed that it could be reduced.
On the other hand, with the charging member described as the prior art described above,
Is ΔV, for example, 300V. By using the charging member 1 in this manner,
In this case, the surface of the charged body as the photoconductor 11 is not affected by scratches or the like.
A belt having no surface and a conventional urethane-only surface layer
Changes in charging ability due to environmental changes
It was found to be very small and stable. For this reason
Although it is not clear, it is not used for the surface layer 4 of the present invention.
Moisture-permeable polyurethane resin or moisture-permeable polyester
Polyurethane resin and navy blue or poorly water-soluble inorganic salt,
Ability to keep moisture absorption constant even when the environment changes
Excellent environmental stability due to its power, especially low temperature and low humidity
(For example, 10 ° C., 30% RH relative humidity)
It is considered that good discharge always occurs.
As a result, the charging ability is stable, and the charging
It is considered that charging was performed. FIG. 4 shows a blade-like band according to another embodiment of the present invention.
FIG. 5 is a sectional view showing the charging member 1a, and FIG.
The photoreceptor 11 using the blade-shaped charging member 1a
It shows the state when performing. The charging member 1a is made of metal
The base end of the intervening layer 3a is fixed to the plate-shaped support member 2a.
A surface layer 4a is formed on the outer peripheral surface of the intervening layer 3a.
You. The surface layer 4a is provided near the free end of the intermediate layer 3a.
Touch 1. The intervening layer 3a is the same as that of the above-described embodiment.
The surface layer 4a is made of the same material as the layer 3 and
Made of the same material as the surface layer 4. Other configurations are described above.
This is the same as the embodiment. In the present invention, for charging for contact with the photoreceptor
The installation of the member is not limited to a specific method.
Is a fixed method, such as rotation in the same or opposite direction as the photoconductor.
Any method can be used. More charged
As a cleaning device for the developer on the photoreceptor
4 and 5, particularly in the embodiments of FIGS.
Noh. Marking on charging member in direct charging of the present invention
Regarding applied voltage and application method, use of each electrophotographic device
Depending on the application, other than the method of instantly applying the desired voltage
Also, the method of applying the voltage stepwise for the purpose of protecting the photoreceptor,
Method of applying a current voltage, marked with DC and AC superimposed
Can be added. The charging members 1 and 1a of the present invention are shown in FIG.
It is also possible to use it as a transfer charging means 8 to be used.
is there. The experimental results of the present inventor will be described. Embodiment 1 Conductive carbon black is added to 100 parts by weight of chloroprene rubber.
10 parts by weight, naphthenic mineral oil 30 parts by weight, zinc oxide
5 parts by weight, magnesium oxide 4 parts by weight, vulcanization accelerator double
Parts and 1 part by weight of stearic acid with an open roll
Then, it was molded with a metal mold to provide the intervening layer 2 of FIG. This intervention
Measure the volume resistance of layer 2 in an environment of 22 ° C. and 60%.
Then 4 × 107Ω · cm, JIS A hardness 40 degrees
Was. Next, ε-caprolactone was converted to polyethylene
Polyols opened with terglycol (ε-caprol
Weight ratio of kuton to polyethylene ether glycol 1:
1, average molecular weight 2000, hydroxyl value 56) 4840 weight
Part and 1,4-butanediol (abbreviation 1,4BD) 500
The mixture is well mixed and stirred, and heated to 60 ° C. This and
The molar ratio between the polyol and the chain extender is 0.435.
You. The mixture was then heated and melted at 50 ° C.
2030 parts by weight of methane diisocyanate (MDI)
(NCO / OH = 1.02) is added and stirred. mixture
After the product becomes uniform, it is aged at 100 ° C for 6 hours.
A lock-like polyurethane resin is obtained. This polyure
The tan resin was pulverized and granulated by an extruder. This resin 10
0 parts by weight of dimethylformamide (DMF) 600 parts by weight
20 parts by weight of navy blue, 5 parts by weight of carbon black
Part, disperse it with a ball mill, intervene in this solution
Layer 3 is applied by dipping to form a surface layer 4 having a thickness of 40 μm.
Provided. The volume resistance of this surface layer 4 is 4 × 107Ω · cm
Met. Embodiment 2 A member similar to that of the first embodiment is replaced with a brake as shown in FIGS.
Example 1 is the same as Example 1 except that it is mounted in the shape of a metal. Embodiment 3 Conductive carbon black is added to 100 parts by weight of chloroprene rubber.
10 parts by weight, naphthenic mineral oil 30 parts by weight, zinc oxide
5 parts by weight, magnesium oxide 4 parts by weight, vulcanization accelerator double
Parts and 1 part by weight of stearic acid with an open roll
Then, it was molded with a metal mold to provide the intervening layer 2 of FIG. This intervention
Measure the volume resistance of layer 2 in an environment of 22 ° C. and 60%.
Then 4 × 107Ω · cm, JIS A hardness 40 degrees
Was. Next, the reaction between succinic acid and diethylene glycol
Polyester polyol formed by condensation reaction (average
2000, hydroxyl value 56) 4840 parts by weight and 1,4
-500 parts by weight of butanediol (abbreviation: 1,4BD)
Mix well and heat to 60 ° C. Polio at this time
The molar ratio of the chain extender to the chain extender is 0.435. Then
Diphenylmethanediyl heated to 50 ° C
2030 parts by weight of soocyanate (MDI) (NCO / OH
= 1.02) and stirred. The mixture became homogeneous
After aging at 100 ° C for 6 hours,
A stell-based polyurethane resin is obtained. This polyurethane
The resin was pulverized and granulated by an extruder. This resin 100
600 parts by weight of dimethylformamide (DMF)
20 parts by weight of navy blue and 5 parts by weight of carbon black
And mix it with a ball mill.
Blue and carbon black were sufficiently dispersed. In this solution
Dipping coating of the intervening layer on the surface layer with a thickness of 40 μm
Was provided. The volume resistance of the surface layer 4 is 3 × 107Ω ・ c
m. Embodiment 4 A member similar to that of the third embodiment was replaced with a brake as shown in FIGS.
Example 3 is the same as Example 3 except that it is mounted in the shape of a metal. Embodiment 5 Conductive carbon black is added to 100 parts by weight of chloroprene rubber.
10 parts by weight, naphthenic mineral oil 30 parts by weight, zinc oxide
5 parts by weight, magnesium oxide 4 parts by weight, vulcanization accelerator double
Parts and 1 part by weight of stearic acid with an open roll
Then, it was molded with a metal mold to provide the intervening layer 2 of FIG. This intervention
Measure the volume resistance of layer 2 in an environment of 22 ° C. and 60%.
Then 4 × 107Ω · cm, JIS A hardness 40 degrees
Was. Next, ε-caprolactone was converted to polyethylene
Polyols opened with terglycol (ε-caprol
Weight ratio of kuton to polyethylene ether glycol 1:
1, average molecular weight 2000, hydroxyl value 56) 4840 weight
Part and 1,4-butanediol (abbreviation 1,4BD) 500
The mixture is well mixed and stirred, and heated to 60 ° C. This and
The molar ratio between the polyol and the chain extender is 0.435.
You. The mixture was then heated and melted at 50 ° C.
2030 parts by weight of methane diisocyanate (MDI)
(NCO / OH = 1.02) is added and stirred. mixture
After the product becomes uniform, it is aged at 100 ° C for 6 hours.
A lock-like polyurethane resin is obtained. This polyure
The tan resin was pulverized and granulated by an extruder. This resin 10
0 parts by weight of dimethylformamide (DMF) 600 parts by weight
In 20 parts by weight of barium sulfate, carbon black
Add 5 parts by weight of this solution, disperse it with a ball mill,
Dipping coating of the intervening layer 3 in the inside
The face layer 4 was provided. The volume resistance of this surface layer 4 is 4 × 107
Ω · cm. Embodiment 6 A member similar to that of the fifth embodiment was replaced with a brake as shown in FIGS.
Example 5 is the same as Example 5 except that it is mounted in the shape of a metal. Embodiment 7 Conductive carbon black is added to 100 parts by weight of chloroprene rubber.
10 parts by weight, naphthenic mineral oil 30 parts by weight, zinc oxide
5 parts by weight, magnesium oxide 4 parts by weight, vulcanization accelerator double
Parts and 1 part by weight of stearic acid with an open roll
Then, it was molded with a metal mold to provide the intervening layer 2 of FIG. This intervention
Measure the volume resistance of layer 2 in an environment of 22 ° C. and 60%.
Then 4 × 107Ω · cm, JIS A hardness 40 degrees
Was. Next, the reaction between succinic acid and diethylene glycol
Polyester polyol formed by condensation reaction (average
2000, hydroxyl value 56) 4840 parts by weight and 1,4
-500 parts by weight of butanediol (abbreviation: 1,4BD)
Mix well and heat to 60 ° C. Polio at this time
The molar ratio of the chain extender to the chain extender is 0.435. Then
Diphenylmethanediyl heated to 50 ° C
2030 parts by weight of soocyanate (MDI) (NCO / OH
= 1.02) and stirred. The mixture became homogeneous
After aging at 100 ° C for 6 hours,
A stell-based polyurethane resin is obtained. This polyurethane
The resin was pulverized and granulated by an extruder. This resin 100
600 parts by weight of dimethylformamide (DMF)
In barium sulfate, 20 parts by weight, carbon black
5 parts by weight were added and mixed with a ball mill to obtain a resin solution.
Navy blue and carbon black were sufficiently dispersed therein. this
Dipping coating of the intervening layer in the solution
A surface layer was provided. The volume resistance of the surface layer 4 is 3 × 107
Ω · cm. Embodiment 8 A member similar to that of the seventh embodiment is replaced with a brake as shown in FIGS.
Example 7 is the same as Example 7 except that it is mounted in the shape of a metal. Comparative Example 1 Conductive carbon black is added to 100 parts by weight of chloroprene rubber.
10 parts by weight, naphthenic mineral oil 30 parts by weight, zinc oxide
5 parts by weight, magnesium oxide 4 parts by weight, vulcanization accelerator double
Parts and 1 part by weight of stearic acid with an open roll
Then, it is molded in a mold, and the roller-shaped charging member 1 shown in FIG.
The stratum 2 was provided. The volume resistance of the intervening layer 2 is set at a temperature of 22
When the resistance is measured in an environment of 60 ° C. and 60% humidity, 4 × 107 Ω
・ Cm, JIS (Japanese Industrial Standard) A hardness 40 degrees
Was. Next, polyester-based urethane manufactured by Dainichi Seika Co., Ltd.
Tan resin solution Resamine ME-3139LP (revised) (solvent
Composition MEK / DMF = weight ratio 40/60, nonvolatile content 30
%) 100 parts by weight to 6 parts by weight of navy blue (100 parts by weight of resin)
About 20 parts by weight), carbon black
10 parts by weight, MEK 50 parts by weight, DMF5
0 parts by weight, mixed with a ball mill and mixed with a resin solution.
Navy blue and carbon black were sufficiently dispersed therein. ME
K is methyl ethyl ketone, DMF is dimethyl
Formamide. The resin solution thus obtained was added to the resin solution of FIG.
Intermediate layer 3 is immersed together with support member 2 of laminar charging member 1
Thus, a surface layer 4 having a thickness of 50 μm was provided. Volume of surface layer 4
6 × 107 Ωcm. Comparative Example 2 In Example 1, no naphthenic mineral oil was added and
Not covering the surface layer 4, only the intervening layer 3. The intervening layer 3
JIS A hardness 70 degrees. [0070] [Table 1] As the poorly water-soluble inorganic salt, the above-mentioned calcium phosphate
Barium sulfate, calcium sulfate, carbonic acid instead of calcium
Barium, calcium carbonate and magnesium carbonate
In each of the examples used, the same good
Results were obtained. OK in the image defect column in Table 1 indicates that the image is defective.
Indicates that no trap has occurred. OK in the column of durability test
Indicates that no scratch is generated on the surface layers 4 and 4a. From the experimental results shown in Table 1, it was found that the charging
The members 1 and 1a have no image defects and have excellent durability.
It was confirmed that. [0074] As described above, according to the present invention, the moisture permeable
Urethane resin or moisture-permeable polyester polyurethane
Surfaces containing resin, and also navy blue or poorly water-soluble inorganic salts
A charging member having a layer is realized, and this charging member is covered.
Contact the charged object and apply a voltage between the charging member and the charged object.
To charge the object to be charged.
The surface of the member to be charged is not adversely affected by scratches, etc.
No image defects and excellent environmental stability
The charging member and the charging device are realized. According to the present invention, as described above,
No scratches on body surface and humidity changes
Even without causing uneven charging,
Charging can be performed, which makes it
Image can be obtained. According to the present invention, a power supply for charging is provided.
The voltage supplied by the
At a relatively low voltage compared to the prior art that performs corona discharge at
It becomes possible to be charged. Further, according to the present invention, a moisture-permeable polyurethane
Resin and moisture-permeable polyester polyurethane resin
Is a charging member that has both water-swelling resistance and moisture permeability.
To achieve good discharge even at low temperature and low humidity
Becomes possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a roller-shaped charging member 1 according to one embodiment of the present invention. FIG. 2 is a simplified side view of an image forming apparatus such as a copying machine or a recording apparatus using the charging member 1. FIG. 3 is a graph showing characteristics of the charging member 1 showing experimental results of the present inventor. FIG. 4 is a blade-shaped charging member 1 according to another embodiment of the present invention.
It is sectional drawing of a. 5 is a side view of a part of an image forming apparatus using the charging member 1a shown in FIG. DESCRIPTION OF SYMBOLS 1, 1a Charging member 2, 2a Support member 3, 3a Intermediate layer 4, 4a Surface layer 5 Exposure means 6 Development means 8 Transfer charging means 9 Cleaning means 10 Pre-exposure means for removing residual potential

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-248174 (JP, A) JP-A-6-313422 (JP, A) JP-A-6-289738 (JP, A) JP-A-5-248 JP-A-5-281830 (JP, A) JP-A-5-262907 (JP, A) JP-A-1-142569 (JP, A) JP-A-1-205180 (JP, A) JP-A-5-59146 (JP, A) JP-A-3-249675 (JP, A) JP-A-63-189876 (JP, A) JP-A-57-159812 (JP, A) (58) (Int.Cl. 7 , DB name) G03G 15/02 G03G 15/08 501 G03G 15/16 103 C08L 75/04

Claims (1)

  1. (57) [Claim 1] It has a surface layer made of a moisture-permeable polyurethane resin, and the moisture-permeable polyurethane resin reacts a polyol and a polyisocyanate in the presence of a chain extender if necessary. A resin obtained by ring-opening ε-caprolactone with polyethylene ether glycol, wherein the weight ratio of polyethylene ether glycol to ε-caprolactone component in the polyol is 1
    / 9 to 1/1, a charging member. 2. A moisture-permeable polyurethane resin having a surface layer containing 2 to 50 parts by weight of navy blue per 100 parts by weight of the moisture-permeable polyurethane resin, wherein the moisture-permeable polyurethane resin requires a polyol and a polyisocyanate. A resin obtained by reacting in the presence of a chain extender, wherein the polyol is a polyol obtained by ring-opening ε-caprolactone with polyethylene ether glycol, wherein the polyethylene ether glycol and ε-caprolactone component in the polyol are used. Weight ratio is 1
    / 9 to 1/1, a charging member. 3. A poorly water-soluble inorganic salt based on 100 parts by weight of the moisture-permeable polyurethane resin and the moisture-permeable polyurethane resin.
    A moisture-permeable polyurethane resin, which is a resin obtained by reacting a polyol and a polyisocyanate in the presence of a chain extender as necessary, wherein the polyol is ε- Polyol obtained by opening caprolactone with polyethylene ether glycol, wherein the weight ratio of polyethylene ether glycol to ε-caprolactone component in the polyol is 1
    / 9 to 1/1, a charging member. 4. A polyol having a molecular weight of 1,000 to 300.
    The charging member according to any one of claims 1 to 3, wherein the charging member has a range of 0. 5. A resin having a surface layer comprising a moisture-permeable polyester-based polyurethane resin, wherein the moisture-permeable polyester-based polyurethane resin is obtained by reacting a polyol and a polyisocyanate, if necessary, in the presence of a chain extender. A charging member, wherein the polyol is a polyester-based polyol obtained by a condensation reaction of succinic acid and diethylene glycol. 6. A moisture-permeable polyester-based polyurethane resin and a surface layer containing 2 to 50 parts by weight of navy blue with respect to 100 parts by weight of the moisture-permeable polyester-based polyurethane resin. A charging member, which is a resin obtained by reacting an isocyanate with a chain extender, if necessary, wherein the polyol is a polyester polyol obtained by a condensation reaction of succinic acid and diethylene glycol. 7. A surface layer containing a moisture-permeable polyester polyurethane resin and 2 to 50 parts by weight of a poorly water-soluble inorganic salt with respect to 100 parts by weight of the moisture-permeable polyester polyurethane resin. A resin obtained by reacting a polyol and a polyisocyanate in the presence of a chain extender, if necessary, wherein the polyol is a polyester polyol obtained by a condensation reaction of succinic acid and diethylene glycol. Charging member. 8. The polyester polyol having a molecular weight of 6
    6. The range of 00 to 3000.
    The charging member according to any one of Items 1 to 7, above. 9. The poorly water-soluble inorganic salt is calcium phosphate,
    4. The material according to claim 3, wherein the material is at least one selected from the group consisting of barium sulfate, calcium sulfate, barium carbonate, calcium carbonate, and magnesium carbonate.
    Or the charging member according to 7. And (b) a metal support member, and (b2) a conductive member having elasticity provided on the outer peripheral surface of the support member. An intervening layer, and (b3) a moisture-permeable polyurethane resin formed on the outer peripheral surface of the intervening layer, which contains a moisture-permeable polyurethane resin and comes into contact with the charged object. A resin obtained by reacting in the presence of
    Caprolactone is a polyol obtained by ring-opening with polyethylene ether glycol, and has a surface layer in which the weight ratio of polyethylene ether glycol and ε-caprolactone component in the polyol is 1/9 to 1/1, and is formed into a roll. And (c) a power supply for applying a voltage between the member to be charged and the supporting member. 11. A conductive member having a base end fixed to: (a) a member to be charged; and (b) a charging member, wherein (b1) a metal supporting member and (b2) a base member are fixed to the supporting member. And (b3) a moisture-permeable polyurethane resin formed on the outer peripheral surface of the intermediate layer, the moisture-permeable polyurethane resin being in contact with a member to be charged near the free end of the intermediate layer, and the moisture-permeable polyurethane resin being composed of a polyol and a polyisocyanate. And a resin obtained by reacting in the presence of a chain extender as necessary,
    This polyol is a polyol obtained by ring-opening ε-caprolactone with polyethylene ether glycol, and has a surface layer in which the weight ratio of polyethylene ether glycol and ε-caprolactone component in the polyol is 1/9 to 1/1, A charging device, comprising: a charging member formed in a blade shape; and (c) a power supply for applying a voltage between the member to be charged and the supporting member. And (b) a metal supporting member, and (b2) an elastic conductive member provided on an outer peripheral surface of the supporting member, wherein the conductive member has elasticity. An intervening layer, and (b3) a moisture-permeable polyester-based polyurethane resin formed on the outer peripheral surface of the intervening layer and including a moisture-permeable polyester-based resin, which comes into contact with a charged object, and the moisture-permeable polyester-based polyurethane resin can optionally include a polyol and a polyisocyanate. A resin obtained by reacting in the presence of a chain extender, wherein the polyol has a surface layer that is a polyester-based polyol formed by a condensation reaction of succinic acid and diethylene glycol, and is formed into a roll. A charging device comprising: a member; and (c) a power supply for applying a voltage between the member to be charged and the supporting member. 13. A conductive member having a base end fixed to (a) a member to be charged, and (b) a charging member, wherein the base end is fixed to (b1) a metal supporting member and (b2) a supporting member. And (b3) a moisture-permeable polyester-based polyurethane resin formed on the outer peripheral surface of the intermediate layer, the moisture-permeable polyester-based polyurethane resin being in contact with a charged body near the free end of the intermediate layer, A resin obtained by reacting a polyol and a polyisocyanate, if necessary, in the presence of a chain extender, wherein the polyol has a surface layer that is a polyester polyol formed by a condensation reaction of succinic acid and diethylene glycol. A charging member formed in a blade shape; and (c) a power supply for applying a voltage between the member to be charged and the supporting member.
JP13325793A 1993-06-03 1993-06-03 Charging member and charging device Expired - Fee Related JP3374861B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13325793A JP3374861B2 (en) 1993-06-03 1993-06-03 Charging member and charging device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP13325793A JP3374861B2 (en) 1993-06-03 1993-06-03 Charging member and charging device
EP94105863A EP0620506A3 (en) 1993-04-16 1994-04-15 Charging member and charging device including the same.
US08/228,273 US5471285A (en) 1993-04-16 1994-04-15 Charging member having a surface layer formed of moisture-permeable synthetic resin material and charging device including the same

Publications (2)

Publication Number Publication Date
JPH06348104A JPH06348104A (en) 1994-12-22
JP3374861B2 true JP3374861B2 (en) 2003-02-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3374861B2 (en)

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