JP6443746B2 - Cleaning blade, process cartridge, and image forming apparatus - Google Patents

Description

  The present invention relates to a cleaning blade, a process cartridge, and an image forming apparatus.

Conventionally, in an electrophotographic image forming apparatus, an image carrier (hereinafter, also referred to as “photosensitive member”, “electrophotographic photosensitive member”, or “electrostatic latent image carrier”) as a member to be cleaned, Deposits such as unnecessary transfer residual toner adhering to the surface after transferring the toner image to the transfer paper or intermediate transfer member are removed by a cleaning means.
As the cleaning member of the cleaning means, one that uses a strip-shaped cleaning blade is well known because it can generally be simplified in configuration and has excellent cleaning performance. The cleaning blade is made of an elastic member such as polyurethane rubber. Then, the base end of the cleaning blade is supported by a support member, the abutting portion (tip ridge line portion) is pressed against the peripheral surface of the image carrier, and the toner remaining on the image carrier is dammed and scraped off and removed. .

  As this type of cleaning blade, for example, Patent Literature 1 describes a cleaning blade having a surface layer coated with a resin containing an ultraviolet curable composition at the tip ridge line portion of the cleaning blade. In this cleaning blade, a surface layer in which a resin having a film hardness of pencil hardness B to 6H is coated on a contact portion of an elastic member made of polyurethane elastomer with a member to be cleaned. As a result, the friction coefficient between the contact portion of the elastic member and the image carrier that is the member to be cleaned can be reduced, and the wear resistance of the cleaning blade and the turning of the tip ridge line portion of the elastic member can be satisfactorily suppressed. It is supposed to be possible.

Further, Patent Document 2, elastic an ultraviolet curable composition containing a silicone after swelling by impregnating the elastic member, the less the image bearing member and the abutting edge line also of the cleaning blade to an ultraviolet irradiation treatment A surface layer harder than a body blade is described. As described above, by impregnating the elastic member with the ultraviolet curable composition, even if the surface layer of the elastic member is worn over time, the portion of the elastic member impregnated with the ultraviolet curable composition is in contact with the member to be cleaned. As a result, the coefficient of friction between the tip ridge line portion of the elastic member and the image carrier can be reduced, and the portion of the elastic member having only low hardness is in direct contact with the surface of the image carrier, so that the cleaning blade and the image It is said that the problem that the friction coefficient with the surface of the carrier increases to cause abnormal wear or abnormal noise can be suppressed over time.

However, like the cleaning blade of Patent Document 1 and the cleaning blade of Patent Document 2, a cleaning blade having a modified portion containing an ultraviolet curable composition at the tip ridge portion of the elastic member that contacts the surface of the member to be cleaned The following problems arise. That is, if the ultraviolet curable composition in the modified portion is not sufficiently cured, the hardness of the tip ridge line portion changes as the resin cures over time. As a result, the hardness that was suitable at the beginning is increased by long-term use or storage of the cleaning blade.
If the hardness of the tip edge line of the cleaning blade is higher than the appropriate hardness, the followability to the surface of the member to be cleaned will be accelerated and the wear of the contact part will be accelerated, so that cleaning failure and abnormal noise are likely to occur. Problems arise.

To achieve the above object, the present invention is in contact with the surface of the cleaning member, the torque leaning blade to remove the material adhering to said cleaning member surface, those on the surface of the object to be cleaned member to contact the contact position, comprising a reformer by UV curable composition, the reforming unit, and impregnation section containing the first UV curable composition in the thickness direction of the area from the front surface of the elastic member, It is at least one of the elastic member and the second ultraviolet-curable surface layer formed of the composition on the surface of, determined by ATR-IR method, unmodified of the elastic member and the infrared absorption spectrum of the reformer in the difference spectrum between the infrared absorption spectrum of the quality unit, 800-820 and the peak area value _{S a} of ^{[cm -1], 1697~1753 [cm} -1] peak area ratio _{S a} of the peak area _{S B} of / _{S B} is, 0.01 Is characterized in that the 6 or less.

  ADVANTAGE OF THE INVENTION According to this invention, the turning of the front-end ridgeline part of an elastic member, abnormal wear, and generation | occurrence | production of abnormal noise can be suppressed, and the followability with respect to the to-be-cleaned member and cleaning property can be maintained over a long period of time.

The perspective view which shows an example of the cleaning blade of this embodiment. 1 is a schematic configuration diagram illustrating an example of an image forming apparatus according to an exemplary embodiment. FIG. 2 is a schematic configuration diagram illustrating an example of an image forming unit included in the image forming apparatus. Sectional drawing which shows another example of the cleaning blade of this embodiment. (A) is an enlarged sectional view showing a state in which the cleaning blade is in contact with the surface of the photoreceptor. (B) is an enlarged view of the vicinity of the edge portion of the cleaning blade. Explanatory drawing of elastic power. (A) And (b) is explanatory drawing for demonstrating the measuring method of the circularity of a toner. The figure which shows the measurement location of the average thickness of the surface layer of the cleaning blade in an Example. (A) is a figure which shows the state where the front-end ridgeline part of the conventional cleaning blade was curled. (B) is a figure explaining the local abrasion of the front end surface of the conventional cleaning blade. (C) is a figure which shows the state which the front-end ridgeline part of the conventional cleaning blade was missing.

Hereinafter, an embodiment of a cleaning blade to which the present invention is applied will be described.
FIG. 1 is a perspective view of the cleaning blade of this embodiment.
The cleaning blade 62 of the present embodiment includes a strip-shaped elastic member 622, and includes a modified portion for increasing the hardness of the tip ridge line portion 62c of the elastic member 622. And other members. In the cleaning blade 62, one end of the elastic member 622 is connected to the support member 621, the other end has a free end portion having a predetermined length, and the tip ridge line portion 62c, which is one end on the free end side, is provided on the surface of the member to be cleaned. It arrange | positions so that it may contact | abut to a longitudinal direction. Thereby, the deposit | attachment adhering to the said to-be-cleaned member surface is removed.

Further, the cleaning blade 62 of the present embodiment has an 800 in a difference spectrum between the infrared absorption spectrum of the modified portion and the infrared absorption spectrum of the unmodified portion of the elastic member 622, which is obtained by the ATR-IR method. to 820 and the peak area value _{S a} of ^{[cm -1],} 1697~1753 peak area ratio _S a / _{S B} of the peak area _{S B} of ^{[cm -1]} is, is 0.0126 or less.

  2. Description of the Related Art Conventionally, in an electrophotographic image forming apparatus, a toner having a small particle size and a nearly spherical shape (hereinafter, sometimes referred to as “polymerized toner”) formed by a polymerization method or the like to meet the recent demand for higher image quality. 2. Description of the Related Art Image forming apparatuses using the above are known. The polymerized toner has characteristics such as higher transfer efficiency than conventional pulverized toner, and can meet the demand. However, it is difficult to remove the polymerized toner sufficiently from the surface of the image carrier using a cleaning blade, and there is a problem that cleaning failure occurs. This is because the polymerized toner having a small particle diameter and excellent sphericity passes through a slight gap formed between the cleaning blade and the image carrier.

  In order to suppress such slip-through, it is necessary to increase the contact pressure between the photosensitive drum 123 and the cleaning blade 62 to enhance the cleaning ability. However, the following problems occur. That is, when the contact pressure of the cleaning blade 62 is increased, the frictional force between the photosensitive drum 123 and the cleaning blade 62 is increased. As a result, as shown in FIG. 8A, the cleaning blade 62 is pulled in the moving direction of the photosensitive drum 123, and the leading edge line portion 62c of the cleaning blade 62 is turned up. When the turned cleaning blade 62 is restored to its original state against the turn, abnormal noise may occur. Furthermore, if the cleaning is continued with the tip edge line portion 62c of the cleaning blade 62 turned up, as shown in FIG. 8B, the blade edge surface 62a of the cleaning blade 62 is separated from the tip edge line portion 62c by several [μm]. Local wear will occur at the spot. If the cleaning is further continued in such a state, the local wear increases, and finally, the leading edge portion 62c is lost as shown in FIG. 8C. If the leading edge portion 62c is missing, the toner cannot be properly cleaned, resulting in poor cleaning.

Therefore, in order to prevent the leading edge line 62c from coming into contact with the surface of the photosensitive drum of the cleaning blade, attempts have been made to increase the hardness of the leading edge line to make it difficult to deform. For example, it is proposed that a surface layer containing an ultraviolet curable resin is provided on the tip ridge line portion 62c of the cleaning blade or the elastic member to increase the hardness of the tip ridge line portion 62c, thereby preventing the tip ridge line portion 62c from being bent or deformed. (Patent Documents 1 and 2).
However, even with the cleaning blade provided with the surface layer of Patent Document 1 and the cleaning blade provided with the impregnated portion of Patent Document 2, the amount of powder formed on the image carrier is very large. Under severe conditions for cleaning such as when forming a solid image, a cleaning failure may occur. This is considered to be due to the following reasons.

  That is, since the surface layer and the impregnated portion are provided over the longitudinal direction of the distal end surface of the elastic member, the elasticity of the elastic member may be hindered by the influence of the surface layer and the impregnated portion. When the elasticity of the elastic member is hindered, when the image carrier is decentered or the surface of the image carrier has minute undulations, the contact pressure in the longitudinal direction of the cleaning blade that contacts the surface of the image carrier is increased. It fluctuates and the followability of the contact portion of the cleaning blade to the surface of the image carrier is reduced. When a large amount of toner is blocked by the cleaning blade, such as during continuous solid image formation, the pressing force on the cleaning blade by the blocked toner increases. For this reason, in a portion where the contact pressure of the cleaning blade against the image carrier is low, if the pressing force to the cleaning blade by the toner on the image carrier is greater than the force of contact of the cleaning blade, the contact state is maintained in that portion. The toner cannot pass through the cleaning blade. As a result, it is considered that defective cleaning occurs under severe conditions such as when a continuous solid image is formed with a very large amount of powder formed on the image carrier.

  If only the surface layer described in Patent Document 1 is provided and the surface layer having a high hardness has a high layer thickness, the elasticity of the elastic member is hindered by the rigidity of the surface layer, and the image holding of the contact portion of the elastic member is performed. Followability to the body surface is reduced. For this reason, in the configuration in which only the surface layer is provided, it is necessary to reduce the thickness of the surface layer having high hardness in order to maintain the followability of the contact portion to the surface of the image carrier. When the surface layer is thinned, the surface layer is worn to such an extent that the elastic member of the cleaning blade is exposed in a short time during use over time. When the elastic member having a low hardness is exposed and directly contacts the surface of the image carrier, the friction coefficient between the cleaning blade and the surface of the image carrier increases, and abnormal wear and noise occur.

  Moreover, the structure which impregnates the ultraviolet curable composition of the said patent document 2 to an elastic member, and forms an impregnation part by performing an ultraviolet irradiation process has the following subjects. That is, when the impregnated portion is formed so that the hardness of the outermost surface of the abutting portion is equivalent to the configuration in which the surface layer is provided on the surface of the elastic member, a large amount of ultraviolet rays is sufficient to cover the surface of the elastic member. It is necessary to impregnate the curable composition. When the large amount of the ultraviolet curable composition is impregnated as described above, the content of the ultraviolet curable composition soaked into the elastic member is also increased. When an elastic member impregnated with a large amount of an ultraviolet curable composition is irradiated with ultraviolet rays, the impregnated portion is excessively hard and excessively deep, and the elasticity of the elastic member is inhibited. Followability to the surface is reduced.

  On the other hand, in order to maintain the followability of the contact portion of the elastic member to the surface of the image carrier, if the amount of the ultraviolet curable composition impregnated in the elastic member is reduced, the surface of the elastic member is made to be an ultraviolet curable composition. Since the outermost surface of the contact portion of the elastic member is in a state where the base rubber of the elastic member and the (meth) acrylic resin are mixed, the contact at the beginning of use compared to the case where the surface layer is provided The hardness of the outermost surface of the portion is lowered, and the frictional force between the cleaning blade and the image carrier is increased. When the frictional force with the image carrier increases, the contact portion of the elastic member is likely to be turned up.

Further, there has been proposed a cleaning blade in which a portion including the contact portion of the elastic member is impregnated with (meth) acrylic resin and a surface layer harder than the elastic member is provided on the surface of the elastic member including the contact portion. (See Patent Document 3). According to this proposal, since a surface layer harder than the elastic member is provided on the surface including the contact portion, the amount of (meth) acrylic resin impregnated in the portion including the contact portion is reduced on the outermost surface of the contact portion. Can be adjusted regardless of hardness. As a result, it is possible to reduce the amount of impregnation, and it is possible to suppress a decrease in the followability of the contact portion to the surface of the image carrier due to the impregnated portion being excessively hard and excessively deeply formed. It is stated that it can be done.
However, while the cleaning blade described in Patent Document 3 has a hardened contact portion, it has a drawback in that the followability to fine vibrations of the image carrier is reduced and cleaning failure is likely to occur.
In recent years, there has been a growing need for higher speed in electrophotographic image forming apparatuses. When the image forming speed is increased, fine vibrations are not generated in the image carrier that rotates at a high speed due to the shaft shake of the image carrier, and the cleaning blade described in Patent Document 3 provides a high-speed image forming apparatus. It was not able to cope enough. Further, the followability to the minute waviness on the surface of the image bearing member cannot be sufficiently dealt with.

  However, the applicant defines the peak area ratio in the difference spectrum between the infrared absorption spectrum of the modified portion and the infrared absorption spectrum of the unmodified portion of the elastic member, as shown in a verification experiment described later. As a result, it was possible to achieve both high followability, turning and blade wear, and good cleaning performance over a long period of time.

<Peak area ratio S _A / S _B >
Hereinafter, 800 to 820 [cm ⁻¹ ] in the difference spectrum between the infrared absorption spectrum of the modified portion and the infrared absorption spectrum of the unmodified portion of the elastic member, determined by the “ATR-IR method”. and peak area values _{S a,} 1,697 to 1,753 for ^{[cm -1]} peak area ratio _S a / _{S B} of the peak area _{S B} of "is described.

The peak area S _B of 1697~1753 [cm ^-1] in the difference spectrum, the area value of peak derived from an ester bond of the ultraviolet curable composition, i.e., the area of the peaks that do not change before and after curing reaction Value. Therefore, 1697-1753 the peak area _{S B} of ^{[cm -1],} can be a UV curable composition amount of the reforming unit.
On the other hand, the peak area value _{S A} of from 800 to 820 ^{[cm -1]} in the difference spectrum, the area value of peak derived from C = C bond of the ultraviolet curable composition, i.e., reduced by the curing reaction It is the area value of the peak. Therefore, the peak area value _{S A} of 800-820 ^{[cm -1],} may be the amount of uncured portions of the reformer.

Therefore, the ratio of the uncured (unreacted) portion to the amount of the ultraviolet curable composition can be expressed as S _A / S _B. The smaller the value of S _A / S _B is, the lower the curing reaction is, that is, the higher the curing rate is.
Click leaning blade 62 of the present embodiment, by the value of the 0.0126 following S A _/ S _B, and high follow-up property, curling or both of the blades wear, and the maintenance of good cleaning property over a long period of time Can be achieved. When the value of S _A / S _B is higher than 0.0126, the curing rate of the ultraviolet curable resin is not sufficient, and the curing reaction of the unreacted portion proceeds with time. Accordingly, the hardness of the modified portion of the cleaning blade deviates from the desired hardness obtained in the initial stage after production due to long-term use or storage, and problems such as a decrease in follow-up and acceleration of the wear rate occur.
In addition, there is no lower limit as a preferable range of the value of S _A / S _B , and a smaller value is more preferable.

The difference spectrum in the present embodiment is obtained by the following method.
That is, when taking the difference between the infrared absorption spectrum of the modified part and the infrared absorption spectrum of the unmodified part, the peak of 1533 cm −1 derived from the C—N—H bond of urethane rubber, which is an elastic member. The absorbance scale of the infrared absorption spectrum of the unmodified part is adjusted so that the value difference becomes zero. The difference spectrum is obtained by subtracting the infrared absorption spectrum of the unmodified part after this adjustment from the infrared absorption spectrum of the modified part. Thereby, the spectrum of the ultraviolet curable composition of modified parts, such as an impregnation part and a surface layer, can be obtained.
Further, by obtaining the difference spectrum by the above-described method, it is possible to prevent the peak of the ultraviolet curable resin of the modified portion which is the peak of interest from being hidden by the peak of the infrared absorption spectrum derived from the elastic member. it can.

  At this time, the unmodified portion used as a measurement site for obtaining the infrared absorption spectrum of urethane rubber that is the elastic member 622 is a portion other than the modified portion including the tip ridge line portion 62c of the elastic member 622 in the elastic member 622. The part of is shown. That is, as long as the material of the elastic member is the same in the reformed part and the unmodified part, any part other than the reformed part may be measured. Further, in the case where the modified portion is provided over the entire cleaning blade, the value measured for the elastic member that is the same material as the cleaning blade and that has not been modified is the value of the unmodified portion of the elastic member. It may be an infrared absorption spectrum.

  The infrared absorption spectrum obtained by the IR method can be measured using a NICOLET AVATAR 370 manufactured by Thermo Fisher Scientific. The window material is measured using Ge.

<To be cleaned>
The member to be cleaned is not particularly limited with respect to its material, shape, structure, size, etc., and can be appropriately selected according to the purpose. Examples of the shape of the member to be cleaned include a drum shape, a belt shape, a flat plate shape, and a sheet shape. There is no restriction | limiting in particular as a magnitude | size of the said member to be cleaned, Although it can select suitably according to the objective, The magnitude | size normally used is preferable.
There is no restriction | limiting in particular as a material of the said to-be-cleaned member, According to the objective, it can select suitably, For example, a metal, a plastic, a ceramic, etc. are mentioned.
There is no restriction | limiting in particular as said member to be cleaned, According to the objective, it can select suitably, For example, when the said cleaning blade is applied to an image forming apparatus, an image carrier etc. are mentioned.

<Adherent>
The adhering matter is not particularly limited as long as it adheres to the surface of the member to be cleaned and is to be removed by the cleaning blade, and can be appropriately selected according to the purpose. For example, toner, lubricant , Inorganic fine particles, organic fine particles, dust, dust or a mixture thereof. Among these, a toner is preferable, and a low-temperature fixable toner having a glass transition temperature of 50 ° C. or lower is particularly preferable.

<Supporting member>
There is no restriction | limiting in particular about the shape, a magnitude | size, a material, etc. as said support member, According to the objective, it can select suitably. Examples of the shape of the support member include a flat plate shape, a strip shape, and a sheet shape. There is no restriction | limiting in particular as a magnitude | size of the said supporting member, According to the magnitude | size of the said member to be cleaned, it can select suitably.
Examples of the material of the support member include metals, plastics, and ceramics. Among these, a metal plate is preferable from the viewpoint of strength, and a steel plate such as stainless steel, an aluminum plate, and a phosphor bronze plate are particularly preferable.

<Elastic member>
There is no restriction | limiting in particular about the shape, material, magnitude | size, structure, etc. as said elastic member 622, According to the objective, it can select suitably. Examples of the shape of the elastic member 622 include a flat plate shape, a strip shape, and a sheet shape. There is no restriction | limiting in particular as a magnitude | size of the said elastic member 622, According to the magnitude | size of the said member to be cleaned, it can select suitably.
There is no restriction | limiting in particular as a material of the said elastic member 622, Although it can select suitably according to the objective, Polyurethane rubber, a polyurethane elastomer, etc. are suitable from the point which is easy to obtain high elasticity.

  There is no restriction | limiting in particular as a manufacturing method of the said elastic member, According to the objective, it can select suitably. For example, a polyurethane prepolymer is prepared using a polyol compound and a polyisocyanate compound, a curing agent and, if necessary, a curing catalyst are added to the polyurethane prepolymer, crosslinked in a predetermined mold, and placed in a furnace. Then, after the cross-linked product is molded into a sheet by centrifugal molding, the product is allowed to stand at room temperature and aged and cut into a flat plate with a predetermined size.

There is no restriction | limiting in particular as said polyol compound, According to the objective, it can select suitably, For example, high molecular weight polyol, low molecular weight polyol, etc. are mentioned.
Examples of the high molecular weight polyol include a polyester polyol which is a condensate of an alkylene glycol and an aliphatic dibasic acid; ethylene adipate ester polyol, butylene adipate ester polyol, hexylene adipate ester polyol, ethylene propylene adipate ester polyol, ethylene butylene Polyester polyols such as polyester polyols of alkylene glycol and adipic acid such as adipate ester polyol and ethylene neopentylene adipate ester polyol; polycaprolactone polyols such as polycaprolactone ester polyol obtained by ring-opening polymerization of caprolactone; Polyethers such as oxytetramethylene) glycol and poly (oxypropylene) glycol Polyol, and the like. These may be used individually by 1 type and may use 2 or more types together.

  Examples of the low molecular weight polyol include 1,4-butanediol, ethylene glycol, neopentyl glycol, hydroquinone-bis (2-hydroxyethyl) ether, 3,3′-dichloro-4,4′-diaminodiphenyllmethane. Dihydric alcohols such as 4,4′-diaminodiphenylmethane; 1,1,1-trimethylolpropane, glycerin, 1,2,6-hexanetriol, 1,2,4-butanetriol, trimethylolethane, 1, Examples thereof include trivalent or higher polyhydric alcohols such as 1,1-tris (hydroxyethoxymethyl) propane, diglycerin and pentaerythritol. These may be used individually by 1 type and may use 2 or more types together.

There is no restriction | limiting in particular as said polyisocyanate compound, According to the objective, it can select suitably, For example, a methylene diphenyl diisocyanate (MDI), tolylene diisocyanate (TDI), xylylene diisocyanate (XDI), naphthylene 1,5 Diisocyanate (NDI), tetramethylxylene diisocyanate (TMXDI), isophorone diisocyanate (IPDI), hydrogenated xylylene diisocyanate (H ₆ XDI), dicyclohexylmethane diisocyanate (H ₁₂ MDI), hexamethylene diisocyanate (HDI), dimer acid diisocyanate (DDI), norbornene diisocyanate (NBDI), trimethylhexamethylene diisocyanate (TMDI), and the like. These may be used individually by 1 type and may use 2 or more types together.

The curing catalyst is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include 2-methylimidazole and 1,2-dimethylimidazole.
The content of the curing catalyst is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.01 [mass%] or more and 0.5 [mass%] or less, and 0.05 [mass%] ] And 0.3 [mass%] or less are more preferable.

The JIS-A hardness of the elastic member is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 60 degrees or more, and more preferably 65 degrees or more and 80 degrees or less. When the JIS-A hardness is less than 60 degrees, it is difficult to obtain the blade linear pressure, and the area of the contact portion with the image carrier is likely to be enlarged, so that a cleaning failure may occur.
Here, the JIS-A hardness of the elastic member can be measured using, for example, a micro rubber hardness meter MD-1 manufactured by Kobunshi Keiki Co., Ltd.

The resilience elastic modulus according to the JIS K6255 standard of the elastic member is not particularly limited and can be appropriately selected according to the purpose, but is preferably 23 [° C.] and 35 [%] or less, and 20 [%] More preferably, it is 30 [%] or less. When the rebound resilience coefficient exceeds 35 [%], the elastic member of the cleaning blade may be tacky, resulting in poor cleaning.
Here, the rebound resilience coefficient of the elastic member is, for example, No. manufactured by Toyo Seiki Seisakusho Co., Ltd. at 23 ° C. in accordance with JIS K6255 standard. It can be measured using a 221 resilience tester.

  There is no restriction | limiting in particular in the average thickness of the said elastic member, Although it can select suitably according to the objective, 1.0 [mm] or more and 3.0 [mm] or less are preferable.

<Reforming section>
The phrase “having a modified portion for increasing the hardness of the leading edge portion 62c of the elastic member 622” indicates that the leading edge portion 62c contacting the image carrier is subjected to a modification process. The modified portion may be included not only on the surface of the tip ridge line portion 62c but also inside the tip ridge line portion 62c when the surface layer is formed so as to cover the tip ridge line portion 62c. And a case where a surface layer is formed on the tip ridge line portion 62c. If at least the tip ridge line portion 62c of the elastic member 622 contains a material for forming a modified portion, the elastic member 622 also contains a material for forming a modified portion at a portion other than the tip ridge line portion 62c. It doesn't matter.

The cleaning blade 62 of the present embodiment has an impregnated portion 62d for increasing the hardness of the tip ridge line portion 62c of the elastic member 622 as a reforming portion.
Thereby, even if the wear of the contact portion of the elastic member proceeds, the high hardness inside the vicinity of the surface layer is maintained, so that good cleaning properties can be maintained for a long time.

<Impregnation part>
A tip ridge line portion (contact portion) 62c that contacts the surface of the member to be cleaned of the elastic member 622 contains a cured product of the first ultraviolet curable composition in a region in the thickness direction from the surface of the contact portion. To do.
The phrase “contains the cured product of the first ultraviolet curable composition in the region in the thickness direction from the surface of the contact portion” means that it is contained not only on the surface of the contact portion but also inside. It is included in the contact portion and a surface layer is formed on the contact portion.
If at least the contact portion of the elastic member contains a cured product of the ultraviolet curable composition, the portion other than the contact portion of the elastic member also contains the cured product of the ultraviolet curable composition. It doesn't matter.

<< first UV curable composition >>
The first ultraviolet curable composition preferably contains a (meth) acrylate compound, and further contains other components as necessary.

  There is no restriction | limiting in particular as said (meth) acrylate compound, Although it can select suitably according to the objective, The (meth) acrylate compound which has an alicyclic structure in a molecule | numerator is preferable.

-(Meth) acrylate compounds having an alicyclic structure in the molecule-
Since the (meth) acrylate compound having an alicyclic structure in the molecule has a special bulky alicyclic structure in the molecule, a (meth) acrylate compound having a small number of functional groups and a small molecular weight should be used. Therefore, the contact portion of the elastic member is easily impregnated, and the hardness of the contact portion can be improved efficiently.

6 or more are preferable and, as for carbon number of the alicyclic structure of the (meth) acrylate compound which has an alicyclic structure in the said molecule | numerator, 6 or more and 12 or less are more preferable. If the number of carbon atoms is less than 6, the hardness of the contact portion may be weakened, and if it exceeds 12, steric hindrance may occur.
The number of functional groups of the (meth) acrylate compound having an alicyclic structure having 6 or more carbon atoms in the molecule is preferably 2 or more, more preferably 2 or more and 6 or less, and still more preferably 2 or more and 4 or less. When the number of functional groups is less than 2, the hardness of the contact portion may be weakened, and when it exceeds 6, steric hindrance may occur.
The molecular weight of the (meth) acrylate compound having an alicyclic structure in the molecule is preferably 200 or less. When the molecular weight exceeds 200, the molecular size increases, so that it is difficult to impregnate the elastic member, and it may be difficult to increase the hardness.

  The (meth) acrylate compound having an alicyclic structure in the molecule is a (meth) acrylate having a tricyclodecane structure from the point that even if there are few functional groups, the lack of crosslinking points can be compensated by a special cyclic structure. Compounds and (meth) acrylate compounds having an adamantane structure are preferred.

The (meth) acrylate compound having a tricyclodecane structure is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include tricyclodecane dimethanol diacrylate and tricyclodecane dimethanol dimethacrylate. Is mentioned.
As the (meth) acrylate compound having the tricyclodecane structure, an appropriately synthesized compound or a commercially available product may be used. As this commercial item, brand name: A-DCP (made by Shin-Nakamura Chemical Co., Ltd.) etc. are mentioned, for example.

The (meth) acrylate compound having an adamantane structure is not particularly limited and may be appropriately selected depending on the intended purpose. For example, 1,3-adamantane dimethanol diacrylate, 1,3-adamantane dimethanol dimethacrylate 1,3,5-adamantane trimethanol triacrylate, 1,3,5-adamantane trimethanol trimethacrylate, and the like.
As the (meth) acrylate compound having an adamantane structure, an appropriately synthesized one or a commercially available product may be used. As this commercial item, a brand name: X-DA (made by Idemitsu Kosan Co., Ltd.), a brand name: X-A-201 (made by Idemitsu Kosan Co., Ltd.), a brand name: ADTM (made by Mitsubishi Gas Chemical Co., Ltd.) , Etc.

The content of the (meth) acrylate compound having an alicyclic structure in the molecule is not particularly limited and may be appropriately selected depending on the intended purpose. However, the solid content relative to the first ultraviolet curable composition is not limited. The amount is preferably 20 [mass%] or more and 100 [mass%] or less, more preferably 50 [mass%] or more and 100 [mass%] or less. If the content is less than 20 [% by mass], high hardness due to a special cyclic structure may be impaired.
A (meth) acrylate compound having an alicyclic structure in the molecule (particularly, a (meth) acrylate compound having a tricyclodecane structure) is included in the contact portion of the elastic member that contacts the surface of the member to be cleaned. It can be analyzed by, for example, an infrared microscope or liquid chromatography.

In addition to the (meth) acrylate compound having an alicyclic structure in the molecule, the first ultraviolet curable composition includes a (meth) acrylate compound having a molecular weight of 100 to 1,500, and a fluorine-based (meth) acrylate. Compounds can be included.
The (meth) acrylate compound having a molecular weight of 100 to 1,500 is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include dipentaerythritol hexa (meth) acrylate and pentaerythritol tetra (meth). ) Acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol ethoxytetra (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane ethoxytri (meth) acrylate, 1,6-hexanediol di (meth) acrylate , Ethoxylated bisphenol A di (meth) acrylate, propoxylated ethoxylated bisphenol A di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,5-pentanedioe Di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,7-heptanediol di (meth) acrylate, 1,8-octanediol di (meth) acrylate, 1,9-nonanediol di ( (Meth) acrylate, 1,10-decanediol di (meth) acrylate, 1,11-undecanediol di (meth) acrylate, 1,18-octadecanediol di (meth) acrylate, glycerin propoxytri (meth) acrylate, dipropylene Glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, PO-modified neopentyl glycol di (meth) acrylate, PEG600 di (meth) acrylate, PEG400 di (meth) acrylate, PEG200 di (meth) acrylate , Neopentyl glycol hydroxypivalate ester di (meth) acrylate, octyl / decyl (meth) acrylate, isobornyl (meth) acrylate, ethoxylated phenyl (meth) acrylate, 9,9-bis [4- (2- (meta ) Acryloyloxyethoxy) phenyl] fluorene, and the like. These may be used individually by 1 type and may use 2 or more types together. Among these, a compound having a pentaerythritol triacrylate structure having 3 to 6 functional groups is preferable.
Examples of the compound having a pentaerythritol triacrylate structure having 3 to 6 functional groups include pentaerythritol triacrylate and dipentaerythritol hexaacrylate.

As the fluorine-based (meth) acrylate compound, those having a perfluoropolyether skeleton are preferable, those having a perfluoropolyether skeleton and having two or more functional groups are more preferable.
The fluorine-based (meth) acrylate compound is not particularly limited and may be appropriately selected depending on the intended purpose. For example, 2,2,2-trifluoroethyl acrylate, 2,2,2-trifluoroethyl methacrylate 2,2,3,3-tetrafluoropropyl acrylate, 2,2,3,3-tetrafluoropropyl methacrylate, 2,2,3,3,4,4,4-heptafluorobutyl acrylate, 2,2, 3,3,4,4,4-heptafluorobutyl methacrylate, 2,2,3,4,4,4-hexafluorobutyl acrylate, 2,2,3,4,4,4-hexafluorobutyl methacrylate, 1 , 1,1,3,3,3-hexafluoroisopropyl acrylate, 1,1,1,3,3,3-hexafluoroisopropylmeta Relate, 1H, 1H, 5H-octafluoropentyl acrylate, 1H, 1H, 5H-octafluoropentyl methacrylate, 2,2,3,3,3-pentafluoropropyl acrylate, 2,2,3,3,3- Pentafluoropropyl methacrylate, 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl acrylate, 3,3,4,4,5,5,6,6 7,7,8,8,8-tridecafluorooctyl acrylate, 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl methacrylate, 2- [(1 ′, 1 ′, 1′-trifluoro-2 ′-(trifluoromethyl) -2′-hydroxy) propyl] -3-norbornyl methacrylate, 1,1,1-trifluoro-2- ( Trifluo Methyl) -2-hydroxy-4-methyl-5-pentyl methacrylate, 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10 -Heptadecafluorodecyl acrylate, 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl methacrylate, 3,3 , 4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,12-henicosafluorododecyl acrylate, 3,3,4 , 4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,12-henicosafluorododecyl methacrylate, 3,3,4,4 5,5,6,6,7,7,8,8,9,9,10,10,11,12,12,12-henikosa 11- (trifluoromethyl) dodecyl methacrylate, and the like. These may be used individually by 1 type and may use 2 or more types together.

  As the fluorine-based (meth) acrylate compound, a commercially available product can be used. Examples of the commercially available product include OPTOOL DAC-HP (manufactured by Daikin Industries, Ltd.) and MegaFac RS-75 (manufactured by DIC Corporation). ), Biscoat V-3F (Osaka Organic Chemical Industry Co., Ltd.), and the like.

  There is no restriction | limiting in particular in content in the said 2nd ultraviolet curable composition of the said fluorine-type (meth) acrylate compound, Although it can select suitably according to the objective, In solid content, 0.1 [mass% ] And 50 [mass%] or less is preferable.

<< Other ingredients >>
There is no restriction | limiting in particular as said other component, According to the objective, it can select suitably, For example, a photoinitiator, a polymerization inhibitor, a diluent, etc. are mentioned.

-Photopolymerization initiator-
The photopolymerization initiator is not particularly limited as long as it generates active species such as radicals and cations by light energy and initiates polymerization, and can be appropriately selected according to the purpose. A radical polymerization initiator, a photocationic polymerization initiator, etc. are mentioned. Among these, a photo radical polymerization initiator is particularly preferable.

  Examples of the radical photopolymerization initiator include aromatic ketones, acylphosphine oxide compounds, aromatic onium salt compounds, organic peroxides, thio compounds (thioxanthone compounds, thiophenyl group-containing compounds, etc.), hexaarylbiimidazoles, and the like. Examples thereof include compounds, ketoxime ester compounds, borate compounds, azinium compounds, metallocene compounds, active ester compounds, compounds having a carbon halogen bond, and alkylamine compounds.

  The radical photopolymerization initiator is not particularly limited and may be appropriately selected depending on the intended purpose. For example, acetophenone, acetophenone benzyl ketal, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2-phenylacetophenone , Xanthone, fluorenone, benzaldehyde, fluorene, anthraquinone, triphenylamine, carbazole, 3-methylacetophenone, 4-chlorobenzophenone, 4,4'-dimethoxybenzophenone, 4,4'-diaminobenzophenone, Michler's ketone, benzoin propyl ether , Benzoin ethyl ether, benzyldimethyl ketal, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 2-hydroxy-2-methyl-1 Phenylpropan-1-one, thioxanthone, diethylthioxanthone, 2-isopropylthioxanthone, 2-chlorothioxanthone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, bis (2 , 4,6-trimethylbenzoyl) -phenylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, 2,4-diethylthioxanthone, bis- (2,6-dimethoxybenzoyl) -2,4 , 4-trimethylpentylphosphine oxide, and the like. These may be used individually by 1 type and may use 2 or more types together.

  Commercially available products can be used as the photoradical polymerization initiator. Examples of the commercially available products include Irgacure 651, Irgacure 184, DAROCUR 1173, Irgacure 2959, Irgacure 127, Irgacure 907, Irgacure 369, Irgacure 379, and DAROCUR. TPO, IRGACURE 819, IRGACURE 784, IRGACURE OXE 01, IRGACURE OXE 02, IRGACURE 754 (above, manufactured by Ciba Specialty Chemicals); Speedcure TPO (manufactured by Lambson); KAYACURE DETX-S Co., Ltd. Lucirin TPO, LR 8893, LR 8970 (above, manufactured by BASF); Ubekrill P36 (manufactured by UCB), etc. It is below. These may be used individually by 1 type and may use 2 or more types together.

  The content of the photopolymerization initiator is not particularly limited and may be appropriately selected depending on the intended purpose. It is 1% by mass or more and 20% by mass with respect to the first ultraviolet curable composition. The following is preferable.

-Polymerization inhibitor-
The polymerization inhibitor is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include p-methoxyphenol, cresol, t-butylcatechol, di-t-butylparacresol, hydroquinone monomethyl ether, α Naphthol, 3,5-di-tert-butyl-4-hydroxytoluene, 2,2'-methylenebis (4-methyl-6-tert-butylphenol), 2,2'-methylenebis (4-ethyl-6-butylphenol) ), 4,4′-thiobis (3-methyl-6-t-butylphenol); p-benzoquinone, anthraquinone, naphthoquinone, phenanthraquinone, p-xyloquinone, p-toluquinone, 2,6-dichloro Quinone, 2,5-diphenyl-p-benzoquinone, 2,5-diacetoxy-p-benzox 2,5-dicaproxy-p-benzoquinone, 2,5-diacyloxy-p-benzoquinone, hydroquinone, 2,5-di-butylhydroquinone, mono-t-butylhydroquinone, monomethylhydroquinone, 2,5-di-t A quinone compound such as amylhydroquinone; an amine compound such as phenyl-β-naphthylamine, p-benzylaminophenol, di-β-naphthylparaphenylenediamine, dibenzylhydroxylamine, phenylhydroxylamine, diethylhydroxylamine; Nitro compounds such as nitrotoluene and picric acid; oxime compounds such as quinone dioxime and cyclohexanone oxime; and sulfur compounds such as phenothiazine. These may be used individually by 1 type and may use 2 or more types together.

-Diluent-
The diluent is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include hydrocarbon solvents such as toluene and xylene; ethyl acetate, n-butyl acetate, methyl cellosolve acetate, propylene glycol monomethyl ether Ester solvents such as acetate; ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone, cyclopentanone; ether solvents such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether; ethanol, Examples thereof include alcohol solvents such as propanol, 1-butanol, isopropyl alcohol, and isobutyl alcohol. These may be used individually by 1 type and may use 2 or more types together.

As a method for including (impregnating) the cured product of the first ultraviolet curable composition containing the (meth) acrylate compound having an alicyclic structure in the molecule into the contact portion of the elastic member, there is no particular limitation. The first ultraviolet curable composition is impregnated by brushing, dip coating or the like on the contact portion of the elastic member, and then irradiated with ultraviolet rays. And a curing method.
There is no restriction | limiting in particular about the conditions of the said ultraviolet irradiation, Although it can select suitably according to the objective, Integrated light quantity is preferable 500 [mJ / cm < ² >] or more. In order to suppress a decrease in the curing rate due to oxygen inhibition, irradiation in an inert gas (Ar, N 2, CO 2, etc.) atmosphere is more preferable.

As described above, in the cleaning blade 62 of the present embodiment, the contact portion of the elastic member that contacts the surface of the member to be cleaned has an alicyclic structure in the molecule in the region in the thickness direction from the surface of the contact portion. A cured product of the first ultraviolet curable composition containing a (meth) acrylate compound having
By including a cured product of the first ultraviolet curable composition containing a (meth) acrylate compound having an alicyclic structure in the molecule in the contact portion of the elastic member, urethane rubber and (meta ) A mixed layer containing an acrylic resin is formed. Then, it is thought that by forming a resin network chain inside the rubber, the crosslink density of the rubber itself increases in a pseudo manner, and the wear resistance is improved. As a result, the contact portion of the elastic member is increased in hardness, and the contact portion can be prevented from being bent or deformed. Furthermore, even when the inside is exposed due to wear of the contact portion over time, the dripping and deformation can be similarly suppressed by the impregnation action.

<Surface layer>
The tip ridge line portion 62c containing a cured product of the first ultraviolet curable composition may have a surface layer containing a cured product of the second ultraviolet curable composition.

<< second ultraviolet curable composition >>
The second ultraviolet curable composition preferably contains a (meth) acrylate compound, and further contains other components as necessary.

  There is no restriction | limiting in particular as said (meth) acrylate compound, Although it can select suitably according to the objective, The (meth) acrylate compound which has a pentaerythritol structure in a molecule | numerator is preferable.

-(Meth) acrylate compound having pentaerythritol structure in the molecule-
The (meth) acrylate compound having a pentaerythritol structure in the molecule preferably has a molecular weight of 110 or less and a functional group number of 3 to 6, for example, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) Examples include acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol ethoxytetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and the like. Among these, pentaerythritol triacrylate, pentaerythritol tetraacrylate, and dipentaerythritol hexaacrylate are preferable.

  The molecular weight of the (meth) acrylate compound having a pentaerythritol structure in the molecule is preferably 110 or less, and the number of functional groups is preferably 3-6.

  The content of the (meth) acrylate compound having a pentaerythritol structure in the molecule is not particularly limited and may be appropriately selected depending on the intended purpose. However, the solid content relative to the second ultraviolet curable composition is solid. The amount is preferably 20 [mass%] or more and 90 [mass%] or less, more preferably 50 [mass%] or more and 80 [mass%] or less.

In addition to the (meth) acrylate compound having an alicyclic structure in the molecule, the second ultraviolet curable composition is a (meth) acrylate compound having a molecular weight of 100 to 1,500, and a fluorine-based (meth) acrylate. The compound and the (meth) acrylate compound which has an alicyclic structure in a molecule | numerator can be contained.
Other (meth) acrylate compounds having a molecular weight of 100 or more and 1,500 or less, the fluorine-based (meth) acrylate compounds, and the (meth) acrylate compounds having an alicyclic structure in the molecule include the first ultraviolet ray. It can select suitably from the thing similar to a curable composition.
As said other component, the thing similar to a said 1st ultraviolet curable composition can be used.

The method for forming the surface layer containing the cured product of the second ultraviolet curable composition at the contact portion of the elastic member is not particularly limited and can be appropriately selected according to the purpose. Examples include a method of spraying the second ultraviolet curable composition on the contact portion to form a surface layer and irradiating with ultraviolet rays to cure.
There is no restriction | limiting in particular about the irradiation conditions of the said ultraviolet-ray, Although it can select suitably according to the objective, Integrated light quantity is preferable 500 [mJ / cm < ² >] or more. In order to suppress a decrease in the curing rate due to oxygen inhibition, irradiation in an inert gas (Ar, N 2, CO 2, etc.) atmosphere is more preferable.

The elastic power of the cleaning blade is preferably 60% or more and 90% or less. The elastic power is a characteristic value obtained as follows from the accumulated stress at the time of measuring Martens hardness. The Martens hardness is measured using a microhardness meter while performing an operation of pushing the Vickers indenter with a constant force, for example, pressing it for 30 seconds, holding it for 5 seconds, and pulling it for 30 seconds with a constant force.
Here, assuming that the accumulated stress when the Vickers indenter is pushed in is Wplast, and the accumulated stress at the test load unloading temple is Welast, the elastic power is a characteristic value defined by the equation of Welast / Wplast × 100 [%]. (See FIG. 5). The higher the elastic power, the smaller the plastic deformation, that is, the higher the rubber property. If the elastic power is too low, it is in a state closer to glass than rubber, and the movement of the abutting portion is suppressed too much, and conversely, wear resistance is deteriorated. Usually, the (meth) acrylic resin has a relatively high elastic power in the range of the Martens hardness, and a rubbery state is obtained. However, depending on the structure of the (meth) acrylic resin, the elastic power may be too high, and the posture as a cleaning blade may not be maintained appropriately.

  The cleaning blade 62 according to the present embodiment can prevent the tip ridge line portion 62c coming into contact with the surface of the member to be cleaned, which is an elastic member, has little wear on the tip ridge line portion 62c of the elastic member during use, and has good cleaning properties. It can be maintained for a long time. Therefore, it can be widely used in various fields, but it is particularly preferably used for an image forming apparatus and a process cartridge described below.

(Image forming apparatus and image forming method)
The image forming apparatus according to the present embodiment includes at least an image carrier, a charging unit, an exposure unit, a developing unit, a transfer unit, a fixing unit, a cleaning unit, and a lubricant applying unit. In addition, other means appropriately selected as necessary are provided. The charging unit and the exposure unit may be collectively referred to as an electrostatic latent image forming unit.

  The image forming method used in the image forming apparatus according to the present embodiment includes at least a charging step, an exposure step, a development step, a transfer step, a fixing step, a cleaning step, and a lubricant application step, and It includes other processes appropriately selected as necessary. The charging process and the exposure process may be collectively referred to as an electrostatic latent image forming process.

  The image forming method used in the image forming apparatus according to the present embodiment can be preferably performed by the image forming apparatus according to the present embodiment. The charging step can be performed by the charging unit, and the exposure. The step can be performed by the exposure unit, the development step can be performed by the development unit, the transfer step can be performed by the transfer unit, and the fixing step can be performed by the fixing unit, The cleaning step can be performed by the cleaning unit, the lubricant applying step can be performed by the lubricant applying unit, and the other steps can be performed by the other unit.

<Image carrier>
The image carrier (hereinafter sometimes referred to as “electrophotographic photoreceptor” or “photoreceptor”) is not particularly limited in terms of material, shape, structure, size, etc., and is appropriately selected from known ones. can do. Examples of the shape of the image carrier include a drum shape and a belt shape. Examples of the material of the image carrier include inorganic photoreceptors such as amorphous silicon and selenium, and organic photoreceptors (OPC) such as polysilane and phthalopolymethine.

<Charging step and charging means>
The charging step is a step of charging the surface of the image carrier, and is performed by a charging unit.
The charging can be performed, for example, by applying a voltage to the surface of the image carrier using the charging unit.
The charging means is not particularly limited and may be appropriately selected depending on the purpose. For example, the charging means known per se provided with a conductive or semiconductive roller, brush, film, rubber blade, etc. And non-contact chargers using corona discharge such as corotrons and corotrons.
The shape of the charging means may take any form, such as a roller, a magnetic brush, or a fur brush, and can be selected according to the specifications and form of the electrophotographic image forming apparatus. In the case of using a magnetic brush, the magnetic brush is composed of, for example, various ferrite particles such as Zn-Cu ferrite as a charging means, a non-magnetic conductive sleeve for supporting it, and a magnet roll included therein. The Or when using a brush, for example, as the material of the fur brush, a fur treated with carbon, copper sulfide, metal or metal oxide is used, and this is wound around a metal or other conductive core. Make it a charger by sticking.
The charger is not limited to the contact charger as described above, but has an advantage that an image forming apparatus in which ozone generated from the charger is reduced can be obtained.
It is preferable that the charger is arranged in contact or non-contact with the image carrier and charges the surface of the image carrier by applying a direct current and an alternating voltage.
In addition, there is a charging roller in which a charging roller having a gap tape on an image carrier and arranged in a non-contact manner, and charging the surface of the image carrier by applying a direct current and an alternating voltage to the charging roller. preferable.

<Exposure process and exposure means>
The exposure step is a step of exposing the charged image carrier surface, and is performed by the exposure means.
The exposure can be performed, for example, by exposing the surface of the image carrier imagewise using the exposure unit.
The optical system in the exposure is roughly classified into an analog optical system and a digital optical system. The analog optical system is an optical system that projects a document directly onto an image carrier by an optical system, and the digital optical system receives image information as an electrical signal, converts this into an optical signal, and converts it into an electrophotographic photosensitive device. It is an optical system that exposes and forms a body.
The exposure means is not particularly limited as long as it can be exposed like an image to be formed on the surface of the image carrier charged by the charging means, and can be appropriately selected according to the purpose. Examples thereof include various exposure devices such as a copying optical system, a rod lens array system, a laser optical system, a liquid crystal shutter optical system, and an LED optical system.
In the present embodiment, an optical back side system that performs imagewise exposure from the back side of the image carrier may be employed.

<Development process and development means>
The developing step is a step of developing the electrostatic latent image with the toner to form a visible image.
The visible image can be formed, for example, by developing the electrostatic latent image using the toner, and can be performed by the developing unit.
The developing unit is not particularly limited as long as it can be developed using, for example, the toner, and can be appropriately selected from known ones. Preferable examples include those having at least a developing unit capable of applying the toner in contact or non-contact.

  The developing unit may be a dry developing type, a wet developing type, a single color developing unit, or a multi-color developing unit. For example, a toner having a stirrer for charging the toner by frictional stirring and a rotatable magnet roller is preferable.

  In the developing unit, for example, the toner and, if necessary, a carrier are mixed and agitated, and the toner is charged by friction at that time, and held on the surface of the rotating magnet roller in a raised state. Is formed. Since the magnet roller is disposed in the vicinity of the image carrier, a part of the toner constituting the magnetic brush formed on the surface of the magnet roller is electrically attracted to the image carrier. Move to the surface. As a result, the electrostatic latent image is developed with the toner to form a visible image with the toner on the surface of the image carrier.

  The toner stored in the developing device may be a developer containing the toner, and the developer may be a one-component developer or a two-component developer.

-Toner-
The toner contains toner base particles and an external additive, and further contains other components as necessary.
The toner may be a monochrome toner or a color toner.
The toner base particles include at least a binder resin and a colorant and, if necessary, other components such as a release agent and a charge control agent.

---- Binder resin ---
The binder resin is not particularly limited and may be appropriately selected depending on the intended purpose. For example, styrene such as polystyrene resin or polyvinyltoluene resin or a homopolymer of a substituted product thereof, styrene-p-chlorostyrene copolymer. Polymer, styrene-propylene copolymer, styrene-vinyltoluene copolymer, styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-methyl methacrylate Copolymer, styrene-ethyl methacrylate copolymer, styrene-butyl methacrylate copolymer, styrene-α-chloromethyl methacrylate copolymer, styrene-acrylonitrile copolymer, styrene-vinyl methyl ether copolymer, Styrene-vinyl methyl ketone copolymer, styrene-butadiene Polymer, styrene-isoprene copolymer, styrene-maleic acid copolymer, styrene-maleic acid ester copolymer, polymethyl methacrylate, polybutyl methacrylate, polyvinyl chloride resin, polyvinyl acetate resin, polyethylene resin, Polypropylene resin, polyester resin, polyurethane resin, epoxy resin, polyvinyl butyral resin, polyacrylic acid resin, rosin, modified rosin, terpene resin, phenol resin, aliphatic hydrocarbon, aromatic petroleum resin, chlorinated paraffin, paraffin wax, Etc. These may be used individually by 1 type and may use 2 or more types together. Among these, polyester resins are particularly preferable in that the melt viscosity can be lowered while ensuring the stability during storage of the toner as compared with styrene resins and acrylic resins.

  The polyester resin can be obtained, for example, by a polycondensation reaction between an alcohol component and a carboxylic acid component.

  There is no restriction | limiting in particular as said alcohol component, According to the objective, it can select suitably, For example, polyethyleneglycol, diethyleneglycol, triethyleneglycol, 1,2-propyleneglycol, 1,3-propyleneglycol, 1,4 -Diols such as propylene glycol, neopentyl glycol, 1,4-butenediol; 1,4-bis (hydroxymethyl) cyclohexane, bisphenol A, hydrogenated bisphenol A, polyoxyethylenated bisphenol A, polyoxypropylenated bisphenol Etherified bisphenols such as A; divalent alcohol units in which these are substituted with a saturated or unsaturated hydrocarbon group having 3 to 22 carbon atoms; other divalent alcohol units; sorbitol, 1, 2, 3 , 6-Hexaneteto , 1,4-sorbitan, pentaesitol, dipentaerythritol, tripentaerythritol, sucrose, 1,2,4-butanetriol, 1,2,5-pentanetriol, glycerol, 2 -Trivalent or higher polyhydric alcohol monomers such as methylpropanetriol, 2-methyl-1,2,4-butanetriol, trimethylolethane, trimethylolpropane, 1,3,5-trihydroxymethylbenzene, etc. Is mentioned.

  The carboxylic acid component is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include monocarboxylic acids such as palmitic acid, stearic acid, and oleic acid; maleic acid, fumaric acid, mesaconic acid, citraconic acid , Terephthalic acid, cyclohexanedicarboxylic acid, succinic acid, adipic acid, sebacic acid, malonic acid, divalent organic acid monomers in which these are substituted with a saturated or unsaturated hydrocarbon group having 3 to 22 carbon atoms, these Acid anhydride, lower alkyl ester and dimer acid from linolenic acid; 1,2,4-benzenetricarboxylic acid, 1,2,5-benzenetricarboxylic acid, 2,5,7-naphthalenetricarboxylic acid, 1 , 2,4-Naphthalenetricarboxylic acid, 1,2,4-butanetricarboxylic acid, 1,2,5-hexanetricarboxylic acid, 3,3-dicarbo Shimechirubutan acid, tetra carboxymethyl methane, 1,2,7,8-octane tetracarboxylic acid Enboru trimer acid, a trivalent or higher polycarboxylic acid monomers anhydrides of these acids, and the like.

--- Colorant ---
The colorant is not particularly limited and may be appropriately selected from known dyes and pigments according to the purpose. For example, carbon black, nigrosine dye, iron black, naphthol yellow S, Hansa yellow (10G, 5G, G), Cadmium yellow, Yellow iron oxide, Ocher, Yellow lead, Titanium yellow, Polyazo yellow, Oil yellow, Hansa yellow (GR, A, RN, R), Pigment yellow L, Benzidine yellow (G, GR) , Permanent Yellow (NCG), Vulcan Fast Yellow (5G, R), Tartrazine Lake, Quinoline Yellow Lake, Anthrazan Yellow BGL, Isoindolinone Yellow, Bengala, Red Dan, Lead Zhu, Cadmium Red, Cadmium Mercury Red, Antimony Zhu, Permanent Red 4R, Parallel , Faise red, parachlor ortho nitroaniline red, Resol Fast Scarlet G, Brilliant Fast Scarlet, Brilliant Carmine BS, Permanent Red (F2R, F4R, FRL, FRLL, F4RH), Fast Scarlet VD, Belkan Fast Rubin B, Brilliant Scarlet G, Risor Rubin GX, Permanent Red F5R, Brilliant Carmine 6B, Pigment Scarlet 3B, Bordeaux 5B, Toluidine Maroon, Permanent Bordeaux F2K, Helio Bordeaux BL, Bordeaux 10B, Bon Maroon Light, Bon Maroon Medium, Eosin Lake, Rhodamine Lake B , Rhodamine lake Y, alizarin lake, thioindigo red B, thioindigo maroon, oil Quinacridone red, pyrazolone red, polyazo red, chrome vermilion, benzidine orange, perinone orange, oil orange, cobalt blue, cerulean blue, alkaline blue rake, peacock blue rake, Victoria blue rake, metal-free phthalocyanine blue, phthalocyanine blue, Fast Sky Blue, Indanthrene Blue (RS, BC), Indigo, Ultramarine Blue, Bitumen, Anthraquinone Blue, Fast Violet B, Methyl Violet Lake, Cobalt Purple, Manganese Purple, Dioxane Violet, Anthraquinone Violet, Chrome Green, Zinc Green, Oxidation Chrome, Pyridian, Emerald Green, Pigment Green B, Naphthol Green B, Green Gold, Acid Guri And enamel lake, malachite green lake, phthalocyanine green, anthraquinone green, titanium oxide, zinc white, litbon, and the like. These may be used individually by 1 type and may use 2 or more types together.

  The content of the colorant in the toner is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1% by mass or more and 15% by mass or less, and preferably 3% by mass or more. 10 [mass%] or less is more preferable.

  The colorant may be used as a master batch combined with a resin. The resin is not particularly limited and can be appropriately selected from known ones according to the purpose. For example, styrene or a substituted polymer thereof, styrene copolymer, polymethyl methacrylate resin, polybutyl Methacrylate resin, polyvinyl chloride resin, polyvinyl acetate resin, polyethylene resin, polypropylene resin, polyester resin, epoxy resin, epoxy polyol resin, polyurethane resin, polyamide resin, polyvinyl butyral resin, polyacrylic acid resin, rosin, modified rosin, terpene Examples thereof include resins, aliphatic hydrocarbon resins, alicyclic hydrocarbon resins, aromatic petroleum resins, chlorinated paraffins, and paraffins. These may be used individually by 1 type and may use 2 or more types together.

---- Release agent ---
There is no restriction | limiting in particular as said mold release agent, According to the objective, it can select suitably, For example, waxes etc. are mentioned.
Examples of the waxes include carbonyl group-containing waxes, polyolefin waxes, and long-chain hydrocarbons. These may be used individually by 1 type and may use 2 or more types together. Among these, a carbonyl group-containing wax is preferable.
Examples of the carbonyl group-containing wax include polyalkanoic acid esters, polyalkanol esters, polyalkanoic acid amides, polyalkylamides, dialkyl ketones, and the like. Examples of the polyalkanoic acid ester include carnauba wax, montan wax, trimethylolpropane tribehenate, pentaerythritol tetrabehenate, pentaerythritol diacetate dibehenate, glycerin tribehenate, and 1,18-octadecane. And diol distearate. Examples of the polyalkanol ester include tristearyl trimellitic acid, distearyl maleate, and the like. Examples of the polyalkanoic acid amide include dibehenyl amide. Examples of the polyalkylamide include trimellitic acid tristearylamide. Examples of the dialkyl ketone include distearyl ketone. Among these carbonyl group-containing waxes, polyalkanoic acid esters are particularly preferable.
Examples of the polyolefin wax include polyethylene wax and polypropylene wax.
Examples of the long chain hydrocarbon include paraffin wax and sazol wax.
The content of the release agent in the toner is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 5% by mass or more and 15% by mass or less.

---- Charge control agent ---
The charge control agent is not particularly limited and may be appropriately selected depending on the intended purpose.For example, nigrosine dyes, triphenylmethane dyes, chromium-containing metal complex dyes, molybdate chelate pigments, rhodamine dyes, Alkoxy amines, quaternary ammonium salts (including fluorine-modified quaternary ammonium salts), alkylamides, phosphorus simple substances or compounds, tungsten simple substances or compounds, fluorine activators, salicylic acid metal salts, metal salts of salicylic acid derivatives, etc. Can be mentioned.

  The content of the charge control agent is not particularly limited and may be appropriately selected depending on the intended purpose. It is preferably 0.1 parts by weight or more and 10 parts by weight or less with respect to 100 parts by weight of the toner. .2 parts by mass or more and 5 parts by mass or less is more preferable.

--External additive--
The external additive is not particularly limited as long as it contains at least silica particles, and can be appropriately selected according to the purpose. Further, for example, inorganic particles such as silica, titanium oxide, alumina, silicon carbide, silicon nitride, boron nitride; polymethacryl having an average particle size of 0.05 [μm] to 1 [μm] obtained by a soap-free emulsion polymerization method Resin particles such as acid methyl particles and polystyrene particles may be included. These may be used individually by 1 type and may use 2 or more types together. Among these, silica whose surface is hydrophobized is particularly preferable.

Examples of the silica include silicone-treated silica. The silicone-treated silica is silica whose surface has been surface-treated (hydrophobized) with silicone oil.
There is no restriction | limiting in particular as the method of the said surface treatment, According to the objective, it can select suitably.
Examples of the silicone oil include dimethyl silicone oil, methyl hydrogen silicone oil, and methylphenyl silicone oil.
A commercially available product can be used as the silicone-treated silica. As said commercial item, RY200, R2T200S, NY50, RY50 (above, Nippon Aerosil Co., Ltd. product) etc. are mentioned, for example.

-Other ingredients-
The other components in the toner are not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a fluidity improver, a cleaning improver, a magnetic material, and a metal soap.

The fluidity improver can be surface-treated to increase hydrophobicity and prevent deterioration of fluidity and charging characteristics even under high humidity. For example, a silane coupling agent, a silylating agent, and a fluoride can be used. Silane coupling agents having an alkyl group, organic titanate coupling agents, aluminum coupling agents, silicone oils, modified silicone oils, and the like.
The cleaning property improver is added to the toner in order to remove the toner after transfer remaining on the image carrier or intermediate transfer member. For example, a fatty acid metal salt such as zinc stearate, calcium stearate, stearic acid; Examples thereof include polymer fine particles produced by soap-free emulsion polymerization such as methyl methacrylate fine particles and polystyrene fine particles. The polymer fine particles preferably have a relatively narrow particle size distribution, and those having a volume average particle size of 0.01 [μm] or more and 1 [μm] or less are suitable.
There is no restriction | limiting in particular as said magnetic material, According to the objective, it can select suitably, For example, iron powder, magnetite, a ferrite, etc. are mentioned. Among these, white is preferable in terms of color tone.

--Method of manufacturing toner--
The method for producing the toner is not particularly limited, and can be appropriately selected from conventionally known toner production methods according to the purpose. Examples thereof include a kneading / pulverizing method, a polymerization method, a dissolution suspension method, and a spraying method. Granulation method and the like. Among these, in order to improve the image quality, a polymerization method such as a suspension polymerization method, an emulsion polymerization method, or a dispersion polymerization method, which can easily increase the circularity and reduce the particle size, is preferable.

---- Kneading and grinding method ---
The kneading and pulverizing method is, for example, a method of manufacturing the toner base particles by melt-kneading a toner material containing at least a binder resin and a colorant, pulverizing and classifying the obtained kneaded material. is there.
In the melt kneading, the toner materials are mixed, and the mixture is charged into a melt kneader and melt kneaded. As the melt kneader, for example, a uniaxial or biaxial continuous kneader or a batch kneader using a roll mill can be used. For example, a KTK type twin screw extruder manufactured by Kobe Steel, a TEM type extruder manufactured by Toshiba Machine Co., Ltd., a twin screw extruder manufactured by Casey Kay, a PCM type twin screw extruder manufactured by Ikegai Iron Works, a Kneader manufactured by Buss, etc. are suitable. Used for. This melt-kneading is preferably performed under appropriate conditions so as not to cause the molecular chains of the binder resin to be broken. Specifically, the melt-kneading temperature is determined with reference to the softening point of the binder resin. If the temperature is higher than the softening point, cutting is severe, and if the temperature is too low, dispersion may not proceed.

  In the pulverization, the kneaded material obtained by the melt-kneading is pulverized. In this pulverization, it is preferable that the kneaded material is first coarsely pulverized and then finely pulverized. At this time, a method of pulverizing by colliding with a collision plate in a jet stream, pulverizing particles by colliding with each other in a jet stream, or pulverizing with a narrow gap between a rotor and a stator that rotate mechanically is preferably used. .

In the classification, the pulverized product obtained by the pulverization is classified and adjusted to particles having a predetermined particle diameter. The classification can be performed, for example, by removing the fine particle portion with a cyclone, a decanter, a centrifuge, or the like.
After the pulverization and classification are completed, the pulverized product is classified into an air stream by centrifugal force or the like, and toner base particles having a predetermined particle diameter can be produced.

  Next, the external additive is externally added to the toner base particles. By mixing and stirring the toner base particles and the external additive using a mixer, the surface of the toner base particles is coated while being crushed. At this time, it is important in terms of durability that the external additive such as silica particles is uniformly and firmly attached to the toner base particles.

--- Polymerization method ---
As a method for producing a toner by the polymerization method, for example, a toner material containing a modified polyester resin capable of at least urea or urethane bond and a colorant is dissolved or dispersed in an organic solvent. Then, the solution or dispersion is dispersed in an aqueous medium, subjected to a polyaddition reaction, the solvent of this dispersion is removed and washed.

  Examples of the modified polyester resin capable of being bonded with urea or urethane include, for example, a polyester prepolymer having an isocyanate group, obtained by reacting a carboxyl group or a hydroxyl group at the terminal of a polyester with a polyvalent isocyanate compound (PIC). Etc. The modified polyester resin obtained by crosslinking and / or extending the molecular chain by the reaction of this polyester prepolymer and amines can improve the hot offset property while maintaining the low temperature fixability.

Examples of the polyvalent isocyanate compound (PIC) include aliphatic polyisocyanates (for example, tetramethylene diisocyanate, hexamethylene diisocyanate, 2,6-diisocyanatomethyl caproate); alicyclic polyisocyanates (for example, Isophorone diisocyanate, cyclohexylmethane diisocyanate, etc.); aromatic diisocyanate (eg, tolylene diisocyanate, diphenylmethane diisocyanate, etc.); aromatic aliphatic diisocyanate (eg, α, α, α ′, α′-tetramethylxylylene diisocyanate, etc.); And those obtained by blocking the polyisocyanate with a phenol derivative, oxime, caprolactam or the like. These may be used individually by 1 type and may use 2 or more types together.
The ratio of the polyvalent isocyanate compound (PIC) is not particularly limited and may be appropriately selected depending on the intended purpose. The equivalent ratio of the isocyanate group [NCO] and the hydroxyl group [OH] of the polyester having a hydroxyl group [NCO ] / [OH] is preferably 5/1 to 1/1, more preferably 4/1 to 1.2 / 1, and still more preferably 2.5 / 1 to 1.5 / 1.

  The isocyanate group contained per molecule in the polyester prepolymer (A) having an isocyanate group is not particularly limited and may be appropriately selected depending on the intended purpose. 5 to 3 is more preferable, and an average of 1.8 to 2.5 is more preferable.

Examples of amines (B) to be reacted with the polyester prepolymer include divalent amine compounds (B1), trivalent or higher polyvalent amine compounds (B2), amino alcohols (B3), amino mercaptans (B4), and amino acids. (B5), and those obtained by blocking the amino groups of B1 to B5 (B6).
Examples of the divalent amine compound (B1) include aromatic diamines (eg, phenylenediamine, diethyltoluenediamine, 4,4′-diaminodiphenylmethane); alicyclic diamines (eg, 4,4′-diamino-). 3,3′-dimethyldicyclohexylmethane, diaminecyclohexane, isophoronediamine, etc.); aliphatic diamines (eg, ethylenediamine, tetramethylenediamine, hexamethylenediamine, etc.), and the like.
Examples of the trivalent or higher polyvalent amine compound (B2) include diethylenetriamine and triethylenetetramine.
Examples of the amino alcohol (B3) include ethanolamine and hydroxyethylaniline.
Examples of the amino mercaptan (B4) include aminoethyl mercaptan and aminopropyl mercaptan.
Examples of the amino acid (B5) include aminopropionic acid and aminocaproic acid.
Examples of the blocked B1-B5 amino group (B6) include ketimine compounds and oxazolidine compounds obtained from the amines of B1-B5 and ketones (for example, acetone, methyl ethyl ketone, methyl isobutyl ketone, etc.) Is mentioned. Among these amines (B), B1 and a mixture of B1 and a small amount of B2 are particularly preferable.

  The ratio of the amines (B) is not particularly limited and may be appropriately selected depending on the intended purpose. The isocyanate group [NCO] in the polyester prepolymer (A) having an isocyanate group and the amines (B The equivalent ratio [NCO] / [NHx] of the amino group [NHx] is preferably 1/2 to 2/1, more preferably 1.5 / 1 to 1 / 1.5, and 1.2 / 1. -1 / 1.2 is more preferable.

  According to the method for producing a toner by the polymerization method as described above, a toner having a small particle diameter and a spherical shape can be produced at low cost with little environmental load.

The disperser for the dispersion is not particularly limited and can be appropriately selected according to the purpose. For example, a low-speed shear disperser, a high-speed shear disperser, a friction disperser, and a high-pressure jet disperser. And an ultrasonic disperser.
Among these, a high-speed shearing disperser is preferable in that the particle size of the dispersion (oil droplet) can be controlled to 2 [μm] or more and 20 [μm] or less.
When the high-speed shearing disperser is used, conditions such as the number of rotations, the dispersion time, and the dispersion temperature can be appropriately selected according to the purpose.
The rotational speed is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1,000 [rpm] or more and 30,000 [rpm] or less, and is preferably 5,000 [rpm] or more and 20,000. [Rpm] or less is more preferable.
There is no restriction | limiting in particular as said dispersion | distribution time, Although it can select suitably according to the objective, In the case of a batch system, 0.1 minutes or more and 5 minutes or less are preferable.
There is no restriction | limiting in particular as said dispersion temperature, Although it can select suitably according to the objective, 0 degreeC or more and 150 degrees C or less are preferable under pressure, and 40 degreeC or more and 98 degrees C or less are more preferable. In general, dispersion is easier when the dispersion temperature is higher.

  The amount of the aqueous medium used when the toner material is dispersed in the aqueous medium is not particularly limited and may be appropriately selected depending on the intended purpose, but is 50 masses per 100 mass parts of the toner material. Part or more and 2,000 parts by weight or less are preferable, and 100 parts by weight or more and 1,000 parts by weight or less are more preferable.

The method for removing the organic solvent from the dispersion is not particularly limited and may be appropriately selected according to the purpose. For example, the temperature of the entire reaction system is gradually raised to evaporate the organic solvent in the oil droplets. And a method of spraying the dispersion into a dry atmosphere to remove the organic solvent in the oil droplets.
When the organic solvent is removed, toner base particles are formed. The toner base particles can be washed, dried, etc., and further classified. The classification may be performed by removing fine particle portions in a liquid by a cyclone, a decanter, centrifugation, or the like, or may be performed after drying.

The obtained toner base particles may be mixed with the external additive and, if necessary, particles such as the charge control agent. At this time, by applying a mechanical impact force, it is possible to prevent the particles such as the external additive from detaching from the surface of the toner base particles.
The method for applying the mechanical impact force is not particularly limited and can be appropriately selected depending on the purpose. For example, a method for applying the impact force to the mixture using blades rotating at high speed, For example, a method may be used in which the mixture is charged and accelerated to cause the particles or particles to collide with an appropriate collision plate.
There is no restriction | limiting in particular as an apparatus used for the said method, According to the objective, it can select suitably, For example, remodeling and grind | pulverizing an Ong mill (made by Hosokawa Micron Corporation) and an I type mill (made by Nippon Pneumatic Co., Ltd.) Examples include an apparatus in which the air pressure is lowered, a hybridization system (manufactured by Nara Machinery Co., Ltd.), a kryptron system (manufactured by Kawasaki Heavy Industries, Ltd.), and an automatic mortar.

The average circularity of the toner is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.97 or more, and more preferably 0.97 or more and 0.98 or less. If the average circularity is less than 0.97, satisfactory transferability and high-quality images without dust may not be obtained.
The average circularity of the toner can be measured using, for example, a flow type particle image analyzer FPIA-1000 manufactured by Sysmex Corporation.

The volume average particle diameter of the toner is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 5.5 [μm] or less.
The ratio (Dv / Dn) between the volume average particle diameter (Dv) and the number average particle diameter (Dn) is not particularly limited and may be appropriately selected depending on the intended purpose. 40 or less is preferable. The closer the ratio (Dv / Dn) is to 1.00, the sharper the particle size distribution. With such a toner having a small particle size and a narrow particle size distribution, the toner charge amount distribution is uniform, a high-quality image with little background fogging can be obtained, and the electrostatic transfer method has a high transfer rate. can do.

  The volume average particle size and particle size distribution of the toner are measured by, for example, Coulter Counter TA-II, Coulter Multisizer II (both manufactured by Coulter Co., Ltd.) and the like as a measurement device for the particle size distribution of toner particles by the Coulter Counter method. can do.

  The toner has a glass transition temperature of 50 ° C. or lower. Even with such low-temperature fixing toner, it is possible to prevent the toner from being crushed and greatly deformed, and to prevent the toner from adhering to the contact portion of the cleaning blade and the image carrier.

The toner can be mixed with a magnetic carrier and used as a two-component developer. In this case, the mass ratio of the carrier and the toner in the two-component developer is not particularly limited and can be appropriately selected according to the purpose. However, the toner is 1 part by mass or more and 10 parts by mass with respect to 100 parts by mass of the carrier. Part or less is preferred.
Examples of the magnetic carrier include iron powder, ferrite powder, magnetite powder, and magnetic resin carrier having a particle size of about 20 [μm] to 200 [μm].
The coating resin is not particularly limited and may be appropriately selected depending on the intended purpose. For example, urea-formaldehyde resin, melamine resin, benzoguanamine resin, urea resin, polyamide resin, epoxy resin, polyvinyl and polyvinylidene resin , Halogenated olefin resins such as acrylic resin, polymethyl methacrylate resin, polyacrylonitrile resin, polyvinyl acetate resin, polyvinyl alcohol resin, polyvinyl butyral resin, polystyrene resin, styrene-acrylic copolymer resin, polyvinyl chloride; polyethylene terephthalate resin, Polyester resins such as polybutylene terephthalate resin; polycarbonate resins, polyethylene resins, polyvinyl fluoride resins, polyvinylidene fluoride resins, polytrifluoroethylene resins, polyester resins Hexafluoropropylene resin, copolymer of vinylidene fluoride and acrylic monomer, copolymer of vinylidene fluoride and vinyl fluoride, terpolymer of tetrafluoroethylene, vinylidene fluoride and non-fluorinated monomer And fluoroterpolymers such as silicone resins.
Furthermore, you may make conductive powder etc. contain in coating resin as needed. Examples of the conductive powder include metal powder, carbon black, titanium oxide, tin oxide, and zinc oxide. These conductive powders preferably have an average particle diameter of 1 [μm] or less. When the average particle diameter exceeds 1 [μm], it may be difficult to control electric resistance.
The toner can also be used as a one-component magnetic toner or a non-magnetic toner that does not use a carrier.

<Transfer process and transfer means>
The transfer step is a step of transferring the visible image onto a recording medium. After the primary transfer of the visible image onto the intermediate transfer member using an intermediate transfer member, the visible image is transferred onto the recording medium. A primary transfer step of forming a composite transfer image by transferring a visible image onto an intermediate transfer body using two or more colors, preferably full color toner as the toner, and a composite transfer image; A mode including a second transfer step of transferring the transfer image onto the recording medium is more preferable.
The transfer can be performed, for example, by charging the image carrier with the visible image using a transfer unit, and can be performed by the transfer unit. The transfer unit includes a primary transfer unit that transfers a visible image onto an intermediate transfer member to form a composite transfer image, and a secondary transfer unit that transfers the composite transfer image onto a recording medium. Embodiments are preferred.
The intermediate transfer member is not particularly limited and may be appropriately selected from known transfer members according to the purpose. Examples thereof include a transfer belt.

The transfer unit (the primary transfer unit and the secondary transfer unit) preferably includes at least a transfer unit that peels and charges the visible image formed on the image carrier to the recording medium side. . There may be one transfer means or two or more transfer means. Examples of the transfer device include a corona transfer device using corona discharge, a transfer belt, a transfer roller, a pressure transfer roller, and an adhesive transfer device.
The recording medium is typically plain paper, but is not particularly limited as long as it can transfer an unfixed image after development, and can be appropriately selected according to the purpose. A PET base or the like can also be used.

<Fixing process and fixing means>
The fixing step is a step of fixing the toner image transferred to the recording medium, and can be fixed using a fixing unit. When two or more color toners are used, the toner may be fixed each time the toner of each color is transferred to the recording medium, or the toner of all colors may be transferred to the recording medium and fixed in a stacked state. Also good.
The fixing unit is not particularly limited, and a heat fixing method using a known heating and pressing unit can be employed. Examples of the heating and pressing means include a combination of a heating roller and a pressure roller, and a combination of a heating roller, a pressure roller, and an endless belt. At this time, the heating temperature is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 80 ° C to 200 ° C. If necessary, for example, a known optical fixing device may be used together with the fixing unit.

<Cleaning process and cleaning means>
The cleaning step is a step of removing the toner remaining on the image carrier and can be suitably performed by a cleaning unit.
As the cleaning means, the cleaning blade of the present invention is used.
The elastic member of the cleaning blade is not particularly limited and can be appropriately selected according to the purpose. However, the pressing member has a pressing force of 10 [N / m] or more and 100 [N / m] or less with respect to the surface of the image carrier. It is preferable to contact with pressure. When the pressing force is less than 10 [N / m], cleaning failure due to toner passing through the contact portion where the elastic member of the cleaning blade contacts the surface of the image carrier is likely to occur, and 100 [N / m]. Exceeding may cause the cleaning blade to swell due to an increase in frictional force at the contact portion. The pressing force is preferably 10 [N / m] or more and 50 [N / m] or less.
The pressing force can be measured using, for example, a measuring device incorporating a small compression type load cell manufactured by Kyowa Denki Co., Ltd.

The angle formed between the tangent line at the portion where the elastic member of the cleaning blade comes into contact with the surface of the image carrier and the end face of the cleaning blade is not particularly limited and can be appropriately selected according to the purpose. It is preferable that the angle is not more than °.
If the angle θ formed is less than 65 °, the cleaning blade may be swung up, and if it exceeds 85 °, a cleaning failure may occur.

<Lubricant application process and lubricant application means>
The lubricant application step is a step of applying a lubricant to the surface of the image carrier, and is performed by a lubricant application means.

<Other processes and other means>
Examples of the other means include a static elimination means, a recycling means, and a control means.
Examples of the other processes include a static elimination process, a recycling process, and a control process.

-Static elimination process and static elimination means-
The neutralization step is a step of performing neutralization by applying a neutralization bias to the image carrier, and can be suitably performed by a neutralization unit.
The neutralization means is not particularly limited, and may be appropriately selected from known neutralizers as long as it can apply a neutralization bias to the image carrier. For example, a neutralization lamp or the like is preferable. It is done.

-Recycling process and recycling means-
The recycling step is a step of recycling the toner removed by the cleaning step to the developing unit, and can be suitably performed by the recycling unit.
There is no restriction | limiting in particular as said recycling means, A well-known conveyance means etc. are mentioned.

-Control process and control means-
The control step is a step of controlling each of the steps, and can be suitably performed by a control unit.
The control means is not particularly limited as long as the movement of each means can be controlled, and can be appropriately selected according to the purpose. Examples thereof include devices such as a sequencer and a computer.

Here, an example of the image forming apparatus according to the present embodiment will be described with reference to the drawings.
FIG. 2 is a schematic configuration diagram illustrating an example of the image forming apparatus 500 according to the present embodiment. The image forming apparatus 500 includes four image forming units 1Y, 1C, 1M, and 1K for yellow, magenta, cyan, and black (hereinafter sometimes referred to as Y, C, M, and K). . These use Y, C, M, and K toners of different colors as image forming substances for forming an image, but the other configurations are the same.

Above the four image forming units 1, a transfer unit 60 including an intermediate transfer belt 14 as an intermediate transfer member is disposed. The toner images of the respective colors formed on the surfaces of the photoreceptors 3Y, 3C, 3M, and 3K included in the image forming units 1Y, 1C, 1M, and 1K, which will be described in detail later, are superimposed on the surface of the intermediate transfer belt. It is a configuration to be transferred.
Further, an optical writing unit 40 is disposed below the four image forming units 1. The optical writing unit 40 serving as a latent image forming unit irradiates the photoconductors 3Y, 3C, 3M, and 3K of the image forming units 1Y, 1C, 1M, and 1K with the laser light L emitted based on the image information. Thereby, electrostatic latent images for Y, C, M, and K are formed on the photoreceptors 3Y, 3C, 3M, and 3K. The optical writing unit 40 polarizes the laser light L emitted from the light source by the polygon mirror 41 that is rotationally driven by a motor, and passes the photosensitive members 3Y, 3C, 3M, and 3K through a plurality of optical lenses and mirrors. Is irradiated. Instead of the configuration described above, it is also possible to employ one that performs light scanning with an LED array.

  Below the optical writing unit 40, a first paper feed cassette 151 and a second paper feed cassette 152 are arranged so as to overlap in the vertical direction. Each of these paper feed cassettes stores a plurality of recording media P in a stacked state, and the uppermost recording medium P has a first paper feed roller 151a and a second paper feed. The rollers 152a are in contact with each other. When the first paper feed roller 151a is driven to rotate counterclockwise in FIG. 2 by the driving means, the uppermost recording medium P in the first paper feed cassette 151 extends vertically on the right side of the cassette in FIG. The paper is discharged toward the paper feed path 153 arranged to exist. Further, when the second paper feed roller 152 a is driven to rotate counterclockwise in FIG. 2 by the driving means, the uppermost recording medium P in the second paper feed cassette 152 is discharged toward the paper feed path 153. .

  A plurality of conveying roller pairs 154 are arranged in the paper feed path 153. The recording medium P sent to the paper feed path 153 is conveyed from the lower side to the upper side in FIG. 2 while being sandwiched between the rollers of the conveyance roller pair 154.

  A registration roller pair 55 is disposed at the downstream end of the paper feed path 153 in the transport direction. The registration roller pair 55 temporarily stops the rotation of both rollers as soon as the recording medium P sent from the conveying roller pair 154 is sandwiched between the rollers. Then, the recording medium P is sent out toward a secondary transfer nip described later at an appropriate timing.

FIG. 3 is an example of an image forming unit provided in the image forming apparatus, and is a configuration diagram showing a schematic configuration of one of the four image forming units 1.
As shown in FIG. 3, the image forming unit 1 includes a drum-shaped photoconductor 3 as an image carrier. The photoconductor 3 has a drum shape, but may have a sheet shape or an endless belt shape.
Around the photoreceptor 3, a charging roller 4, a developing device 5, a primary transfer roller 7, a cleaning device 6, a lubricant application device 10, a charge removal lamp, and the like are disposed. The charging roller 4 is a charging member provided in a charging device as a charging unit, and the developing device 5 is a developing unit that converts a latent image formed on the surface of the photoreceptor 3 into a toner image. The primary transfer roller 7 is a primary transfer member provided in a primary transfer device as a primary transfer unit that transfers a toner image on the surface of the photoreceptor 3 to the intermediate transfer belt 14. The cleaning device 6 is a cleaning unit that cleans the toner remaining on the photoreceptor 3 after the toner image is transferred to the intermediate transfer belt 14. The lubricant application device 10 is a lubricant application unit that applies a lubricant onto the surface of the photoreceptor 3 after the cleaning device 6 performs cleaning. The neutralization lamp is a neutralization unit that neutralizes the surface potential of the photoreceptor 3 after cleaning.

The charging roller 4 is arranged in a non-contact manner with a predetermined distance from the photoconductor 3, and charges the photoconductor 3 to a predetermined polarity and a predetermined potential. The surface of the photoreceptor 3 uniformly charged by the charging roller 4 is irradiated with laser light L from an optical writing unit 40 serving as a latent image forming unit based on image information, thereby forming an electrostatic latent image.
The developing device 5 has a developing roller 51 as a developer carrier. A developing bias is applied to the developing roller 51 from a power source. In the casing of the developing device 5, a supply screw 52 and a stirring screw 53 are provided for stirring the developer contained in the casing while conveying the developer in opposite directions. A doctor 54 for regulating the developer carried on the developing roller 51 is also provided. The toner in the developer stirred and conveyed by the two screws of the supply screw 52 and the stirring screw 53 is charged to a predetermined polarity. The developer is pumped up on the surface of the developing roller 51, and the developer pumped up is regulated by the doctor 54, and the toner adheres to the latent image on the photoconductor 3 in the development area facing the photoconductor 3. .

The cleaning device 6 includes a fur brush 101, a cleaning blade 62, and the like. The cleaning blade 62 is in contact with the photoconductor 3 in the counter direction with respect to the surface movement direction of the photoconductor 3. Details of the cleaning blade 62 will be described later.
The lubricant application device 10 includes a solid lubricant 103, a lubricant pressure spring 103 a, and the like, and uses a fur brush 101 as an application brush for applying the solid lubricant 103 onto the photoreceptor 3. The solid lubricant 103 is held by the bracket 103b and is pressed toward the fur brush 101 by a lubricant pressurizing spring 103a. Then, the solid lubricant 103 is scraped by the fur brush 101 that rotates in the rotational direction with respect to the rotation direction of the photoconductor 3, and the lubricant is applied onto the photoconductor 3. By applying lubricant to the photoreceptor, the friction coefficient on the surface of the photoreceptor 3 is maintained at 0.2 or less during non-image formation.

  The charging device is a non-contact proximity arrangement system in which the charging roller 4 is brought close to the photosensitive member 3, and as the charging device, known devices such as a corotron, a scorotron, and a solid state charger (solid state charger) are known. A configuration can be used. Among these charging methods, the contact charging method or the non-contact proximity arrangement method is more desirable, and has advantages such as high charging efficiency, a small amount of ozone generation, and miniaturization of the apparatus.

The light source of the laser light L of the optical writing unit 40 and the light source such as a static elimination lamp include a fluorescent lamp, a tungsten lamp, a halogen lamp, a mercury lamp, a sodium lamp, a light emitting diode (LED), a semiconductor laser (LD), and an electroluminescence (EL). ) And other luminescent materials can be used.
In addition, various types of filters such as a sharp cut filter, a band pass filter, a near infrared cut filter, a dichroic filter, an interference filter, and a color temperature conversion filter can be used to irradiate only light in a desired wavelength range.
Among these light sources, a light emitting diode and a semiconductor laser have high irradiation energy and have a long wavelength light of 600 [nm] or more and 800 [nm] or less, so that they are used favorably.

  2 includes a belt cleaning unit 162, a first bracket 63, a second bracket 64, and the like in addition to the intermediate transfer belt 14. In addition, four primary transfer rollers 7Y, 7C, 7M, and 7K, a secondary transfer backup roller 66, a driving roller 67, an auxiliary roller 68, a tension roller 69, and the like are also provided. The intermediate transfer belt 14 is endlessly moved counterclockwise in FIG. 2 by the rotational driving of the driving roller 67 while being stretched around these eight roller members. The four primary transfer rollers 7Y, 7C, 7M, and 7K sandwich the intermediate transfer belt 14 that is moved endlessly between the photoreceptors 3Y, 3C, 3M, and 3K to form primary transfer nips. . Then, a transfer bias having a polarity opposite to that of the toner (for example, plus) is applied to the back surface (loop inner peripheral surface) of the intermediate transfer belt 14. The intermediate transfer belt 14 sequentially passes through the primary transfer nips for Y, C, M, and K along with the endless movement thereof, and on the front surface thereof, the intermediate transfer belt 14 is on the photoreceptors 3Y, 3C, 3M, and 3K. Y, C, M, and K toner images are superimposed and primarily transferred. As a result, a four-color superimposed toner image (hereinafter sometimes referred to as a four-color toner image) is formed on the intermediate transfer belt 14.

  The secondary transfer backup roller 66 sandwiches the intermediate transfer belt 14 with the secondary transfer roller 70 disposed outside the loop of the intermediate transfer belt 14 to form a secondary transfer nip. The registration roller pair 55 described above feeds the recording medium P sandwiched between the rollers toward the secondary transfer nip at a timing at which the recording medium P can be synchronized with the four-color toner image on the intermediate transfer belt 14. The four-color toner image on the intermediate transfer belt 14 is affected by the secondary transfer electric field formed between the secondary transfer roller 70 to which the secondary transfer bias is applied and the secondary transfer backup roller 66, and the influence of the nip pressure. Then, the secondary transfer is batch-transferred onto the recording medium P in the secondary transfer nip. Then, combined with the white color of the recording medium P, a full color toner image is obtained.

  Untransferred toner that has not been transferred to the recording medium P adheres to the intermediate transfer belt 14 after passing through the secondary transfer nip. This is cleaned by the belt cleaning unit 162. The belt cleaning unit 162 has a belt cleaning blade 162a in contact with the front surface of the intermediate transfer belt 14, thereby scraping off and removing the transfer residual toner on the intermediate transfer belt 14.

  The first bracket 63 of the transfer unit 60 swings at a predetermined rotation angle about the rotation axis of the auxiliary roller 68 as the solenoid is turned on / off. When forming a monochrome image, the image forming apparatus 500 slightly rotates the first bracket 63 counterclockwise in FIG. 2 by driving the solenoid described above. By this rotation, the primary transfer rollers 7Y, 7C, and 7M for Y, C, and M are revolved counterclockwise in FIG. , M is separated from the photoconductors 3Y, 3C, 3M. Of the four image forming units 1Y, 1C, 1M, and 1K, only the K image forming unit 1K is driven to form a monochrome image. Accordingly, it is possible to avoid wear of each member constituting the image forming unit 1 due to wasteful driving of the Y, C, M image forming unit 1 during monochrome image formation.

  A fixing unit 80 is disposed above the secondary transfer nip in FIG. The fixing unit 80 includes a pressure heating roller 81 that contains a heat source such as a halogen lamp, and a fixing belt unit 82. The fixing belt unit 82 includes a fixing belt 84 as a fixing member, a heating roller 83 containing a heat source such as a halogen lamp, a tension roller 85, a driving roller 86, a temperature sensor, and the like. Then, the endless fixing belt 84 is endlessly moved in the counterclockwise direction in FIG. 2 while being stretched by the heating roller 83, the tension roller 85, and the driving roller 86. In the process of endless movement, the fixing belt 84 is heated from the back side by the heating roller 83. A pressurizing and heating roller 81 that is driven to rotate clockwise in FIG. 2 is in contact with the surface of the fixing belt 84 that is heated in this manner from the front surface side. Thus, a fixing nip where the pressure heating roller 81 and the fixing belt 84 abut is formed.

  A temperature sensor is disposed outside the loop of the fixing belt 84 so as to face the front surface of the fixing belt 84 with a predetermined gap, and the surface temperature of the fixing belt 84 immediately before entering the fixing nip. Is detected. This detection result is sent to the fixing power supply circuit. The fixing power supply circuit performs on / off control of power supply to the heat generation source included in the heating roller 83 and the heat generation source included in the pressure heating roller 81 based on the detection result of the temperature sensor.

  The recording medium P that has passed through the secondary transfer nip described above is separated from the intermediate transfer belt 14 and then sent into the fixing unit 80. Then, in the process of being conveyed from the lower side to the upper side in FIG. 2 while being sandwiched by the fixing nip in the fixing unit 80, the full-color toner image is fixed on the recording medium P by being heated and pressed by the fixing belt 84. Is done.

  The recording medium P on which the fixing process has been performed in this manner is discharged to the outside of the image forming apparatus after passing between the rollers of the paper discharge roller pair 87. A stack unit 88 is formed on the upper surface of the casing of the image forming apparatus 500 main body, and the recording media P discharged to the outside of the image forming apparatus by the discharge roller pair 87 are sequentially stacked on the stack unit 88.

  Above the transfer unit 60, four toner cartridges 200Y, 200C, 200M, and 200K that store Y, C, M, and K toners are disposed. The Y, C, M, and K toners in the toner cartridges 200Y, 200C, 200M, and 200K are appropriately supplied to the developing devices 5Y, 5C, 5M, and 5K of the image forming units 1Y, 1C, 1M, and 1K. These toner cartridges 200Y, 200C, 200M, and 200K can be attached to and detached from the image forming apparatus main body independently of the image forming units 1Y, 1C, 1M, and 1K.

Next, an image forming operation in the image forming apparatus 500 will be described.
First, when a print execution signal is received from the operation unit or the like, a predetermined voltage or current is sequentially applied to the charging roller 4 and the developing roller 51 respectively at a predetermined timing. Similarly, a predetermined voltage or current is sequentially applied to the optical writing unit 40 and a light source such as a static elimination lamp at a predetermined timing. In synchronization with this, the photosensitive member 3 is driven to rotate in the direction of the arrow in FIG. 2 by a photosensitive member driving motor as a driving means.

When the photoconductor 3 rotates in the direction of the arrow in FIG. 2, first, the surface of the photoconductor 3 is uniformly charged to a predetermined potential by the charging roller 4. Then, the laser beam L corresponding to the image information is irradiated onto the photoconductor 3 from the optical writing unit 40, and the portion irradiated with the laser light L on the surface of the photoconductor 3 is neutralized to form an electrostatic latent image. .
The surface of the photoreceptor 3 on which the electrostatic latent image is formed is rubbed by a developer magnetic brush formed on the developing roller 51 at a portion facing the developing device 5. At this time, the negatively charged toner on the developing roller 51 is moved to the electrostatic latent image side by a predetermined developing bias applied to the developing roller 51 to be converted into a toner image (development). In each image forming unit 1, the same image forming process is executed, and a toner image of each color is formed on the surface of each photoconductor 3Y, 3C, 3M, 3K of each image forming unit 1Y, 1C, 1M, 1K. .
As described above, in the image forming apparatus 500, the electrostatic latent image formed on the photoreceptor 3 is reversely developed by the developing device 5 with the negatively charged toner. In this embodiment, an example using a non-contact charging roller system of N / P (negative positive: toner adheres to a place where the potential is low) has been described, but the present invention is not limited to this.

The toner images of the respective colors formed on the surfaces of the photoreceptors 3Y, 3C, 3M, and 3K are sequentially primary-transferred so as to overlap on the surface of the intermediate transfer belt 14. As a result, a four-color toner image is formed on the intermediate transfer belt 14.
The four-color toner image formed on the intermediate transfer belt 14 is fed from the first paper feed cassette 151 or the second paper feed cassette 152, passed between the rollers of the registration roller pair 55, and fed to the secondary transfer nip. To the recording medium P to be transferred. At this time, the recording medium P is temporarily stopped while being sandwiched between the registration roller pair 55, and is supplied to the secondary transfer nip in synchronization with the leading edge of the image on the intermediate transfer belt 14. The recording medium P to which the toner image has been transferred is separated from the intermediate transfer belt 14 and conveyed to the fixing unit 80. Then, the recording medium P to which the toner image is transferred passes through the fixing unit 80, whereby the toner image is fixed on the recording medium P by the action of heat and pressure, and the recording medium P on which the toner image is fixed is an image. It is discharged out of the forming apparatus 500 and stacked on the stack unit 88.

On the other hand, the transfer residual toner on the surface of the intermediate transfer belt 14 that has transferred the toner image onto the recording medium P at the secondary transfer nip is removed by the belt cleaning unit 162.
Further, the surface of the photoreceptor 3 on which the toner images of the respective colors are transferred to the intermediate transfer belt 14 at the primary transfer nip, the residual toner after the transfer is removed by the cleaning device 6, and the lubricant is applied by the lubricant applying device 10. Thereafter, the charge is removed by a charge removal lamp.

  As shown in FIG. 3, the image forming unit 1 of the image forming apparatus 500 includes a photosensitive member 3 and a charging roller 4, a developing device 5, a cleaning device 6, and a lubricant applying device 10 as process means. It has been. The image forming unit 1 can be integrally attached to and detached from the main body of the image forming apparatus 500 as a process cartridge. In the image forming apparatus 500, the image forming unit 1 integrally replaces the photosensitive member 3 as a process cartridge and the process means, but the photosensitive member 3, the charging roller 4, the developing device 5, and the cleaning device 6. Alternatively, the lubricant application device 10 may be replaced with a new one in units.

  The toner used in the image forming apparatus 500 is a polymerized toner (glass transition produced by suspension polymerization, emulsion polymerization, or dispersion polymerization, which is easy to increase the circularity and particle size from the viewpoint of improving image quality. It is preferable to use a low-temperature fixable toner having a temperature of 50 ° C. or lower. Among these, from the viewpoint of forming a high-resolution image, it is preferable to use a polymerized toner having an average circularity of 0.97 or more and a volume average particle size of 5.5 [μm] or less.

  In the case of the high-circular and small-sized polymerized toner (low-temperature fixable toner), the polymerized toner may be removed by the cleaning blade 62 in the same manner as when the conventional pulverized toner is removed from the surface of the photoreceptor 3. It cannot be sufficiently removed from the surface of the photoreceptor 3 and cleaning failure occurs. Therefore, when the contact pressure of the cleaning blade 62 to the photosensitive member 3 is increased to improve the cleaning performance, there is a problem that the cleaning blade 62 is worn out early. Further, the frictional force between the cleaning blade 62 and the photoconductor 3 is increased, and the contact portion (tip ridge line portion) 62c of the cleaning blade 62 that is in contact with the photoconductor 3 is pulled in the moving direction of the photoconductor 3, The leading edge line portion (contact portion) 62c is bent (see FIGS. 8A to 8C). When the leading edge portion (contact portion) 62c of the cleaning blade 62 is rolled, various problems such as abnormal noise, vibration, and loss of the contact portion occur. Further, the low-temperature fixable toner that has passed through the cleaning blade is crushed and fused to the surface of the cleaning blade or the image carrier to lower the cleaning function, or to the image of the image carrier by fusing to the surface of the image carrier. There is a problem that it becomes defective.

4A and 4B are cross-sectional views showing another example of the cleaning blade of this embodiment, and are enlarged cross-sectional views of the cleaning blade 62 of FIG. FIG. 4A is an explanatory diagram of a state where the cleaning blade 62 is in contact with the surface of the photosensitive member (image carrier) 3, and FIG. 4B is a front edge line (contact) of the cleaning blade 62. Part) 62c is an enlarged explanatory view in the vicinity of 62c.
The cleaning blade 62 of this embodiment has the same configuration as that described with reference to FIG. 1 except that a surface layer is provided in addition to the impregnation portion. For this reason, the same code | symbol is attached | subjected to the part similar to FIG. 1, and description is abbreviate | omitted. Hereinafter, description will be made using the image carrier 3 as a member to be cleaned and toner as an adhering substance.

As shown in FIG. 4A, the cleaning blade 62 includes a flat plate-shaped support member 621 made of a rigid material such as metal or hard plastic, and a strip-shaped elastic member 622. The elastic member 622 is fixed to one end side of the support member 621 by an adhesive or the like, and the other end side of the support member 621 is cantilevered by the case of the cleaning device 6.
The cleaning blade 62 includes a support member 621 and a flat plate-like elastic member 622 having one end connected to the support member and the other end having a free end having a predetermined length. A tip ridge line portion 62c, which is one end on the free end side of the elastic member 622, is disposed so as to contact the surface of the photosensitive member (image carrier) 3 along the longitudinal direction.

The elastic member 622 preferably has a high resilience rate so that it can follow the eccentricity of the image carrier 3 and minute undulations on the surface of the image carrier 3, and polyurethane rubber is preferred. The elastic member preferably has a JIS-A hardness of 60 degrees or more. Moreover, the rebound resilience according to the JIS K6255 standard of the elastic member is preferably 35 [%] or less at 23 [° C.].
A tip ridge line portion (contact portion) 62c that contacts the surface of the image carrier of the elastic member 622 of the present embodiment includes an impregnation portion 62d and a surface layer 623, which will be described later, as the reforming portion 100.
It has an impregnated portion 62d containing a cured product of the first ultraviolet curable composition in a region in the thickness direction from the surface of the contact portion. The contact portion containing the cured product of the first ultraviolet curable composition has a surface layer 623 containing a cured product of the second ultraviolet curable composition.

In the cleaning blade 62, the elastic member 622 made of urethane rubber is impregnated with the first ultraviolet curable composition by dip coating, and further the second ultraviolet curable composition for forming the surface layer 623 is spray-coated. After processing, the resin is cured by ultraviolet irradiation.
The timing of irradiating the ultraviolet rays to cure the impregnated first ultraviolet curable composition is as follows. After the elastic member 622 is impregnated with the first ultraviolet curable composition, the surface layer 623 is coated. You may irradiate with ultraviolet rays. After impregnating the first ultraviolet curable composition into the urethane rubber serving as the base material of the elastic member 622, after curing the first ultraviolet curable composition impregnated by irradiation with ultraviolet rays, If the constitution is such that the surface layer 623 is coated with the second ultraviolet curable composition, the impregnation state of the first ultraviolet curable composition is fixed to the urethane rubber before the surface layer 623 is formed. Even if the second ultraviolet curable composition for forming the surface layer 623 is applied later, the impregnation state does not change, and thus the elastic member 622 in a desired impregnation state can be produced.

The impregnation of the contact portion 62c of the elastic member 622 can be performed by impregnating the ultraviolet curable composition by brush coating, spray coating, dip coating, or the like.
The above-mentioned difference between the surface and the internal Martens hardness of the elastic body can be obtained by impregnating an elastic member 622 such as polyurethane with an ultraviolet curable resin monomer. When impregnating, the type of UV curable resin monomer, the type of polymerization initiator, the curing method, the solid content concentration of the formulation solution, the polymerization initiator concentration of the formulation solution, the impregnation time, the resin residue on the blade surface after impregnation The depth of the portion to be hardened changes due to the cleaning process, the formation of the surface layer, and the like.

  In the present embodiment, in order to achieve high followability of the cleaning blade, the above conditions were studied earnestly with the aim of hardening only the surface layer near the ridgeline of the cleaning blade. As a result, it is possible to control the difference in hardness between the inside and the surface by sucking out an arbitrary amount of monomer soaked in the vicinity of the surface by changing the cleaning liquid and the process in the cleaning process of the blade resin residue after the impregnation. all right. Also, when the surface layer is provided, the surface layer forming liquid can be infiltrated in the vicinity of the surface by changing the thickness of the surface layer and the drying time after the surface layer is provided (the time before irradiation with ultraviolet rays). It was found that only the vicinity of the surface can be made to have high hardness.

The surface layer 623 covers the tip ridge portion 62c of the cleaning blade 62 by spray coating, dip coating, screen printing, or the like after the elastic member 622 is impregnated with an ultraviolet curable resin and air-dried for a predetermined time.
The surface layer 623 is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably a second ultraviolet curable composition that is harder than the Martens hardness of the elastic member, and is 0.2 [μm] or more and 5 It is preferable to coat with a thickness of [μm] or less. Further, the surface layer 623 is made of a member having a hardness higher than that of the elastic member 622, so that the surface layer 623 is rigid and difficult to be deformed, so that the tip ridge line portion 62c of the cleaning blade 62 can be prevented from being turned up.

After impregnating with the ultraviolet curable composition or after covering with the surface layer 623, the impregnated portion 62d shown in FIG. 4 is formed by irradiating with ultraviolet rays, and the leading edge portion (contact portion) 62c is formed. The effect of improving the hardness can be produced.
A surface layer 623 harder than the elastic member 622 is provided on the surface including the contact portion with a thickness of 2 [μm] to 5 [μm] or less. Thus, the tip ridge line portion 62c of the elastic member 622 has the surface layer 623 and the impregnated portion 62d, so that the Martens hardness of the surface at a position away from the tip ridge line portion by 20 [μm] in the thickness direction of the elastic member. 1 [N / mm ² ] to 15 [N / mm ² ] can be realized.
As a result, curling of the contact portion of the elastic member can be suppressed, and the followability of the contact portion to the member to be cleaned can be improved, and abnormal noise and blade wear can be suppressed. A cleaning blade can be provided.

Further, the cleaning blade 62 of the present embodiment has an 800 in a difference spectrum between the infrared absorption spectrum of the modified portion and the infrared absorption spectrum of the unmodified portion of the elastic member 622, which is obtained by the ATR-IR method. to 820 and the peak area value _{S a} of ^{[cm -1],} 1697~1753 peak area ratio _S a / _{S B} of the peak area _{S B} of ^{[cm -1]} is, is 0.0126 or less.
Thereby, since the curing rate of the modified portion can be increased from the initial stage after manufacture, even after long-term use or storage, the movement of the abutting portion of the elastic member is suppressed and appropriate flexibility can be applied to the photoreceptor. It can have a follow-up property, and can suppress a good cleaning property and occurrence of abnormal noise.

(Process cartridge)
The process cartridge of this embodiment includes at least an image carrier and a cleaning unit that removes toner remaining on the image carrier, and further includes other units as necessary.
As the cleaning means, the cleaning blade of the present invention is used.
The process cartridge includes an image carrier and the cleaning blade of the present invention, and further includes at least one of a charging unit, an exposure unit, a developing unit, a transfer unit, a cleaning unit, and a charge eliminating unit. An apparatus (part) that is detachable from the image forming apparatus.

  In the above description, the tip ridge line portion 62c of the elastic member 622 has been described using an example having only the impregnated portion as the modified portion, and an example having the impregnated portion and the surface layer as the modified portion. The configuration that can achieve the above effect is not limited to this. For example, the same effect can be obtained even when the tip ridge line portion 62c of the elastic member 622 has only the surface layer as the modified portion.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

<JIS-A hardness of elastic member>
The JIS-A hardness on the contact surface side of the elastic member was measured according to JIS K6253 (23 ° C.) using a micro rubber hardness meter MD-1 manufactured by Kobunshi Keiki Co., Ltd.

<Rebound resilience of elastic member>
The rebound resilience of the elastic member is 23 [° C.], No. manufactured by Toyo Seiki Seisakusho, Ltd. The measurement was performed according to JIS K6255 using a 221 regilynester. The sample used was a stack of sheets with a thickness of 2 [mm] so that the thickness was 4 [mm] or more.

<Average circularity of toner>
The average circularity of the toner was measured by a flow type particle image analyzer (FPIA-2000, manufactured by Sysmex Corporation). Specifically, a surfactant (alkyl benzene sulfonate) is added as a dispersant in 0.1 [mL] to 0.1 [mL] in 100 [mL] to 150 [mL] of water from which impure solids have been removed in advance. 5 [mL] was added, and about 0.1 [g] to 0.5 [g] of a measurement sample (toner) was further added. Thereafter, the suspension in which the toner is dispersed is subjected to dispersion treatment with an ultrasonic disperser for 1 to 3 minutes, and the concentration of the dispersion becomes 3,000 [pieces / μL] to 10,000 [pieces / μL]. What was made was set in the analyzer, and the shape and distribution of the toner were measured. Based on the measurement result, the outer peripheral length of the actual toner projection shape shown in FIG. 6A is C1, and the projection area is S. The outer circumference of the perfect circle shown in FIG. C2 / C1 was determined when the length was C2, and the average value was defined as the average circularity.

<Volume average particle diameter of toner>
The volume average particle diameter of the toner was determined by a Coulter counter method. Specifically, the toner number distribution and volume distribution data measured by a Coulter Multisizer 2e type (manufactured by Beckman Coulter) were sent to a personal computer for analysis via an interface (manufactured by Nikkaki Co., Ltd.). . More specifically, a 1 [mass%] NaCl aqueous solution using primary sodium chloride was prepared as an electrolytic solution. Then, 0.1 [mL] to 5 [mL] of a surfactant (alkylbenzene sulfonate) was added as a dispersant to the electrolytic aqueous solution 100 [mL] to 150 [mL]. Further, 2 [mg] to 20 [mg] of toner as a test sample was added thereto, and dispersion treatment was performed for 1 minute to 3 minutes with an ultrasonic disperser. Then, the electrolytic aqueous solution 100 [mL] to 200 [mL] was put into another beaker, and the solution after the dispersion treatment was added therein to a predetermined concentration, and applied to the Coulter Multisizer 2e type.
The aperture is 100 [μm], and the particle size of 50,000 toner particles is measured. The channel is 2.00 [μm] or more and less than 2.52 [μm]; 2.52 [μm] or more and less than 3.17 [μm]; 3.17 [μm] or more and less than 4.00 [μm]; 4 0.000 [μm] or more and less than 5.04 [μm]; 5.04 [μm] or more and less than 6.35 [μm]; 6.35 [μm] or more and less than 8.00 [μm]; 8.00 [μm] More than 10.08 [μm]; 10.08 [μm] or more and less than 12.70 [μm]; 12.70 [μm] or more and less than 16.00 [μm]; 16.00 [μm] or more and 20.20 [More] <20 μm]; less than 25.40 [μm]; 25.40 [μm] to less than 32.00 [μm]; 32.00 [μm] to less than 40.30 [μm] 13 Channels were used and toners with a particle size of 2.00 [μm] or more and 32.0 [μm] or less were targeted.
The volume average particle diameter was calculated based on the relational expression “volume average particle diameter = ΣXfV / ΣfV”. However, “X” is the representative diameter in each channel, “V” is the equivalent volume in the representative diameter of each channel, and “f” is the number of particles in each channel.

<Measurement of glass transition temperature of toner>
The glass transition temperature of the toner was measured by DSC (differential scanning calorimeter, manufactured by Seiko Instruments Inc.) at a heating rate of 10 [° C./min].

Next, a verification experiment conducted by the applicants will be described.
The verification experiment shown below is the average of the material of the elastic member 622, the impregnation treatment material (ultraviolet curable composition) of the impregnated portion 62d, the impregnation time, the surface treatment material of the surface layer 623 (ultraviolet curable composition), and the surface layer. The evaluation was performed while changing the thickness, the UV irradiation integrated amount, and the irradiation atmosphere.

(Production example)
-Production of elastic members 1-2-
With reference to the cleaning blade manufacturing method described in Example 1 of JP 2011-141449 A, flat elastic members 1 and 2 having an average thickness of 1.8 [mm] were manufactured.
The physical properties of these elastic members 1 and 2 are shown in Table 1 below.

(Preparation example)
-Preparation of UV curable composition-
From the composition shown in Table 2 below, ultraviolet curable compositions 1 to 6 were prepared by a conventional method.

  The details of the curable materials used in the ultraviolet curable compositions 1 to 6 are shown in Tables 3 and 4 below.

<Example of toner preparation>
A toner prepared by the following polymerization method (Japanese Patent Application Laid-Open No. 2014-92633) was used. The physical properties of the produced toner are as follows.
Toner base particles: average circularity 0.98, volume average particle size 4.9 [μm]
External additive: 1.5 parts by mass of small particle size silica (manufactured by Clariant, H2000)
0.5 parts by mass of small particle size titanium oxide (manufactured by Teika, MT-150AI)
1.0 part by mass of large particle silica (manufactured by Denki Kagaku Kogyo Co., UFP-30H)
-Glass transition temperature of toner: 50 ° C

Example 1
<Preparation of cleaning blade 1>
After immersing the ultraviolet curable composition 1 for 300 [s] from the front end surface of the strip-shaped elastic member 1 having a thickness of 1.8 [mm] for 300 [s], it adheres to the surface of the elastic member 1 with cyclohexane. The remaining UV curable composition 1 was washed and then air-dried for 2 minutes.
Next, a surface layer was formed by spray coating the ultraviolet curable composition 4 on the contact portion (tip ridge line portion) of the elastic member 1 after the impregnation treatment with the member to be cleaned. Specifically, the entire front end of the elastic member 1 is sprayed from the front end surface of the elastic member to the contact portion of each elastic member subjected to the impregnation treatment at a spray gun moving speed of 6 [mm / s]. Was overcoated. After touch-drying for 3 minutes, coating was performed on the lower surface of the elastic member so that a surface layer having an average thickness of 2.3 [μm] was formed from the contact portion to a width of about 3 [mm] at the tip. Thereafter, finger touch drying was performed for 3 minutes, and ultraviolet exposure was performed using a high-pressure mercury lamp so that the UV irradiation integrated amount was 60000 [mJ / cm ² ]. At this time, ultraviolet exposure (irradiation atmosphere) was performed in an air atmosphere.

  Next, each elastic member having a surface layer formed on the contact portion was fixed to a sheet metal holder with an adhesive so that it could be mounted on a color multifunction machine (image MPC4500, manufactured by Ricoh Co., Ltd.). As described above, the cleaning blade 1 having the surface layer formed on the contact portion was produced.

<Measurement method of UV light intensity>
An ultraviolet integrated light amount at a wavelength of 254 [nm] was measured using an ultraviolet integrated light meter UIT-250 (manufactured by USHIO). At this time, the measurement was carried out so that the sensor part of the integrating photometer was the same as the height of the ridge line part of the tip of the cleaning blade.

<Average thickness of surface layer>
FIG. 7 is a cross-sectional view showing a measurement location of the average thickness of the surface layer of the cleaning blade in the example.
As shown in FIG. 7, the elastic member 622 was cut in a plane orthogonal to the longitudinal direction, and this cross-section was faced up, and observed with a digital microscope VHX-2000 (manufactured by Keyence Corporation). The measurement location is 30 [mu] m position, 50 [[mu] m] position in the thickness direction of the elastic member 622 from the abutting portion (tip ridge line portion) 62c of the abutting side long axis surface 62f in the short axis surface 62e of the cross section. And the thickness of the surface layer was measured at a position of 100 [μm], and the average value was taken as the average thickness of the surface layer.
As a method of cutting the elastic member into a ring, the elastic member 622 was cut with a razor perpendicular to the longitudinal direction of the elastic member 622 so that the thickness in the longitudinal direction of the elastic member 622 was 3 [mm]. At that time, if a vertical slicer is used, the cross section can be cut more neatly. The position in the longitudinal direction where the elastic member was cut into a ring was the position excluding the 2 [cm] portions at both ends.

  Various characteristics of the produced elastic member and cleaning blade were measured as follows. The results are shown in Table 6.

<Cleaning blade peak area ratio S _A / S _B >
The peak area ratio of the cleaning blade is obtained from the two peak areas calculated from the IR spectrum measured by the ATR method using a NICOLET AVATAR 370 manufactured by Thermo Fisher Scientific. I R measurement positions of the modified portion of the elastic member after modification treatment, it is possible to measure any point as long as the reformer. Also, I R measurement position of the unmodified portion of the elastic member is capable of measuring any point as long as unmodified portion. The peak area was calculated using the attached software.

<Martens hardness>
The front edge portion or al bullets member 20 in the thickness direction of the [[mu] m] away Martens hardness (HM) is Fischer Instruments Inc., using a micro hardness meter HM-2000, 1.0 mN Vickers indenter The sample was pressed for 10 seconds with a force of, held for 5 seconds, and extracted for 10 seconds with a force of 1.0 [mN].

(Image Forming Apparatus of Example 1)
<Assembly of image forming apparatus>
The produced cleaning blade 1 was attached to a color multifunction peripheral (image MP C4500, manufactured by Ricoh Co., Ltd.) (the printer unit has the same configuration as the image forming apparatus 500 shown in FIG. 2), and the image forming apparatus of Example 1 was assembled.
The cleaning blade was attached to the image forming apparatus so that the linear pressure was 20 [g / cm] and the cleaning angle was 79 °.
The image forming apparatus includes a lubricant application device on the surface of the photoconductor, and the coefficient of static friction on the surface of the photoconductor is maintained at 0.2 or less during non-image formation by applying the lubricant.
The static friction coefficient on the surface of the photoreceptor was measured by the Euler belt method described in paragraph No. [0046] of JP-A-9-166919.

<Image forming conditions>
Using the image forming apparatus, lab environment: 65% RH at 21 [° C.], paper feeding condition: image area ratio 5 [%] Chart output 3 sheets / print, 50,000 sheets (A4 size horizontal) Then, various characteristics were evaluated as follows. The results are shown in Table 7.

<Cleanability>
As an evaluation image, a vertical band pattern (with respect to the paper traveling direction) 43 [mm] width, 20 pieces of 3 charts in an A4 size are output, and the obtained images are visually observed to check for abnormal images due to poor cleaning. The cleaning property was evaluated by the presence or absence. In the following, “◯” and “Δ” are acceptable, and “×” is unacceptable.
[Evaluation criteria]
○: Toner missing due to poor cleaning cannot be visually confirmed on the printing paper or the photoreceptor. Δ: Toner missing due to poor cleaning does not exist on the printing paper but can be visually confirmed on the photoreceptor. Defective toner can be visually confirmed on both the printing paper and the photoreceptor.

<Noise>
As an evaluation of abnormal noise, the presence or absence of abnormal noise was confirmed by human ears at the time of image output for cleaning evaluation, and the following determination was made. At this time, even if there is a difference in sound such as high frequency and low frequency, the presence or absence of occurrence as an abnormal sound was evaluated without distinction as long as it was a sound coming from the blade.
[Evaluation criteria]
○: No abnormal noise occurs ×: An abnormal noise occurs

<Long-term stability>
In order to confirm the stability of the characteristics of the cleaning blade after long-term use, an image is output one week after the cleaning blade is manufactured (initial), and after evaluating the cleaning performance and abnormal noise, the cleaning blade is darkened. After being stored for 3 months at the same place (equivalent in the image forming apparatus), the image was output, and then cleaning property evaluation and abnormal noise evaluation were performed.

(Examples 2-9 and Comparative Examples 1-5)
-Preparation of cleaning blades 2-9 and 10-14-
In the cleaning blade 1 of Example 1, the elastic member shown in Table 5 below, the ultraviolet curable composition used for the impregnation treatment, the impregnation time, the ultraviolet curable composition used for forming the surface layer, the average thickness of the surface layer, and the UV irradiation integration Cleaning blades 2-9 and 10-14 of Examples 2-9 and Comparative Examples 1-5 were produced in the same manner as in Example 1 except that the amount and the irradiation atmosphere were changed.
Each of the produced cleaning blades 2 to 13 was attached to a color multifunction machine (image MPC4500, manufactured by Ricoh Co., Ltd.) in the same manner as the cleaning blade 1 of Example 1, and image formation of Examples 2 to 8 and Comparative Examples 1 to 5 was performed. The device was assembled. Further, in the same manner as in Example 1, cleaning property, abnormal noise, and long-term stability were evaluated, and the results are shown in Table 7.

From the results of Table 7, in the cleaning blades 1 to 9 of Examples 1 to 9, the value of the peak area ratio S _A / S _{B in} the IR spectrum is 0.0126 or less. As a result, since the curing rate of the modified portion is high from the initial stage after manufacture, even after storage for 3 months, it is possible to keep track of the photosensitive member by suppressing the movement of the contact portion of the elastic member and moderate flexibility. It was found that good cleaning properties and the occurrence of abnormal noise can be suppressed.

On the other hand, in Comparative Example 1, since the contact portion was not modified with the ultraviolet curable resin, the movement of the contact portion of the elastic member could not be suppressed, and cleaning failure and noise were generated.
In Comparative Examples 2 to 5, the peak area ratio S _A / S _{B in} the IR spectrum is not 0.0126 or less. For this reason, even if the cleaning property is good at the initial stage after production, the curing reaction of the reformed portion progressed during storage for 3 months, which changed from the initial characteristics. As a result, in the evaluation after 3 months, the wear easily progressed and a cleaning failure occurred.

What has been described above is merely an example, and the present invention has a specific effect for each of the following modes.
(Aspect A)
There is provided an elastic member such as an elastic member 622 that contacts the surface of the member to be cleaned such as the photosensitive member 3 and removes adhering matter adhering to the surface of the member to be cleaned, and contacts the surface of the member to be cleaned of the elastic member. In the cleaning blade in which the contact portion such as the tip ridge line portion 62c that comes into contact has a modified portion such as the modified portion 100 made of an ultraviolet curable composition, the modified portion is located in the thickness direction region from the surface of the contact portion. Surface layer such as surface layer 623 formed of the second ultraviolet curable composition on the surface of the elastic member including the impregnated portion 62d and the like containing the first ultraviolet curable composition and the tip ridge line portion. 800 to 820 [cm ^−1] in the difference spectrum between the infrared absorption spectrum of the modified portion and the infrared absorption spectrum of the unmodified portion of the elastic member, which is obtained by the ATR-IR method. ] And click area value _{S A,} from 1,697 to 1,753 peak area ratio _S A / _{S B} of the peak area _{S B} of ^{[cm -1],} it is 0.0126 or less.

In this embodiment, as shown in the verification experiment described above, by setting the value of the peak area ratio S _{A /} S _B of the IR spectrum and 0.0126 or less, EVEN cure rate of the reforming portion from the initial can do. For this reason, even after storage for 3 months, it is possible to keep track of the photosensitive member by suppressing the movement of the abutting portion of the elastic member and moderate flexibility, and it is possible to suppress good cleaning performance and generation of abnormal noise. it can.
Moreover, when the value of S _A / S _B is higher than 0.0126, the curing rate of the ultraviolet curable composition in the modified part at the initial stage after production is not sufficient, and the curing reaction in the unreacted part proceeds with time. When used or stored for a long period of time, the hardness is deviated from the target hardness, and problems such as a decrease in follow-up performance and acceleration of wear rate occur.

(Aspect B)
In the aspect A, at least the surface layer such as the surface layer 623 is the modified portion, and the thickness of the surface layer is 0.2 [μm] or more and 5 [μm] or less.
According to this, as shown in the verification experiment, it is possible to improve the wear resistance and to prevent the contact portion of the elastic member from turning up.

(Aspect C)
In the aspect A or B, the Martens hardness of the surface of 20 [μm] from the tip ridge line portion of the cleaning blade such as the tip ridge line portion 62c of the elastic member 622 is 1 to 15 [N / mm ² ].
According to this, as shown in the verification experiment, curling of the contact portion of the elastic member can be suppressed, the followability of the contact portion to the member to be cleaned can be improved, and abnormal noise and blade wear can be suppressed. In addition, good cleaning properties can be obtained even in high-speed printing.

(Aspect D)
In any one of the aspects A to C, at least the impregnation part and the surface layer are the modified part, and the first ultraviolet curable composition and the second ultraviolet curable composition are (meth) Contains an acrylate compound.

(Aspect E)
In any one of the aspects A to D, at least the impregnation part is the modified part, and the first ultraviolet curable composition has an alicyclic structure having 6 or more carbon atoms in the molecule. Containing.
According to this, since it has a bulky special alicyclic structure in the molecule, a (meth) acrylate compound having a small number of functional groups and a small molecular weight can be used. Therefore, the contact portion of the elastic member is easily impregnated, and the hardness of the contact portion can be improved efficiently. Moreover, when the carbon number of the alicyclic structure of the (meth) acrylate compound having an alicyclic structure is less than 6, the hardness of the contact portion may be weakened.

(Aspect F)
In any one of Embodiments A to E, at least the surface layer is the modified portion, and the second ultraviolet curable composition contains a (meth) acrylate compound having a pentaerythritol structure in the molecule.

(Aspect G)
An image carrier such as the photosensitive member 3; a charging unit such as a charging roller 4 for charging the surface of the image carrier; and an optical writing unit 40 that exposes the charged image carrier to form an electrostatic latent image. A developing unit such as a developing device 5 that develops the electrostatic latent image with toner to form a visible image, and a transfer unit 60 that transfers the visible image to a recording medium. An image forming apparatus 500 having a fixing means such as a fixing unit for fixing the transfer image transferred to the recording medium, and a cleaning means such as a cleaning device 6 for removing toner remaining on the image carrier. In the image forming apparatus, any one of the cleaning blades A to F is used as the cleaning unit.
With such a configuration, it is possible to maintain good cleaning properties and obtain a good image.

(Aspect H)
In a process cartridge having at least an image carrier such as the photoreceptor 3 and a cleaning unit such as a cleaning device 6 that removes toner remaining on the image carrier, any one of the aspects A to F is used as the cleaning unit. Use a cleaning blade.
According to this, as described in the above embodiment, a good cleaning property can be obtained. In addition, operability can be improved by taking the form of a process cartridge.

DESCRIPTION OF SYMBOLS 1 Image forming unit 3 Photoconductor 4 Charging roller 5 Developing device 6 Cleaning device 10 Lubricant coating device 14 Intermediate transfer belt 40 Optical writing unit 50 Developing device 60 Transfer unit 62 Cleaning blade 62a Blade tip surface 62c Tip edge portion 62d Impregnated portion 80 Fixing unit 100 Reforming unit 500 Image forming apparatus 621 Support member 622 Elastic member 623 Surface layer S _A peak area value S _B peak area value S _A / S _B peak area ratio

Japanese Patent No. 3602898 JP 2004-233818 A Patent No. 5532378

Claims (8)

In contact with the surface of the cleaning member, the torque leaning blade to remove the material adhering to said cleaning member surface,
The contact position that contacts the surface of the member to be cleaned is provided with a reforming portion made of an ultraviolet curable composition,
The reforming unit, impregnation section containing the first UV curable composition in the thickness direction of the area from the front surface of the elastic member, which is formed by the second ultraviolet-curable composition to the surface of the elastic member 800 to 820 [cm] in the difference spectrum between the infrared absorption spectrum of the modified portion and the infrared absorption spectrum of the unmodified portion of the elastic member, which is at least one of the surface layers and is determined by the ATR-IR method. ⁻¹ ] peak area value S _A and 1697 to 1753 [cm ⁻¹ ] peak area value S _B , the peak area ratio S _A / S _B is 0.0126 or less. . The cleaning blade of claim 1.
At least the surface layer is the modified portion, and the thickness of the surface layer is 0.2 [μm] or more and 5 [μm] or less. The cleaning blade according to claim 1 or 2,
A cleaning blade, wherein the Martens hardness of the contact position surface or et 20 [[mu] m] away in the thickness direction of a 1~15 [N / mm ^2]. The cleaning blade according to any one of claims 1 to 3,
A front Symbol impregnated portion and the table surface layer is said reforming section,
The cleaning blade, wherein the first ultraviolet curable composition and the second ultraviolet curable composition contain a (meth) acrylate compound. In the cleaning blade according to any one of claims 1 to 4,
At least the impregnation part is the reforming part,
The cleaning blade, wherein the first ultraviolet curable composition contains a (meth) acrylate compound having an alicyclic structure having 6 or more carbon atoms in the molecule. The cleaning blade according to any one of claims 1 to 5,
At least the surface layer is the modified portion,
The cleaning blade, wherein the second ultraviolet curable composition contains a (meth) acrylate compound having a pentaerythritol structure in the molecule. An image carrier, a charging unit for charging the surface of the image carrier, an exposure unit for exposing the charged image carrier to form an electrostatic latent image, and developing the electrostatic latent image using toner Developing means for forming a visible image, transfer means for transferring the visible image to a recording medium, fixing means for fixing the transferred image transferred to the recording medium, and remaining on the image carrier. In an image forming apparatus having a cleaning means for removing toner,
An image forming apparatus using the cleaning blade according to claim 1 as the cleaning unit. In a process cartridge having at least an image carrier and cleaning means for removing toner remaining on the image carrier,
A process cartridge using the cleaning blade according to claim 1 as the cleaning means.

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