JPH03269564A - Cleaning blade - Google Patents

Abstract

PURPOSE:To maintain wear resistance, low-friction characteristic, cleanability, and the non-atackability to a photosensitive drum and to make improvement in image quality by forming a part of a blade including its edge part or the entire part of the blade of a compsn. contg. fluoro-rubber, thermoplastic fluororesin, and low-mol. wt. fluorine-contained polymer as its essential components. CONSTITUTION:A part of the blade including its edge part or the entire part of the blade is formed of the compsn. contg. the fluoro-rubber is a polymer or copolymer of a unit monomer contg. >=1 pieces of fluorine atoms in average and is not particularly limited if this rubber has the glass transition point of room temp. or below and rubber-like elasticity at room temp. The thermoplastic fluororesin is a polymer which has mainly a carbon chain in its main chain and has the bond of fluorine in the side chain and is preferably >=1 kinds of the polymers selected from a group consisting of, for example, a tetrafluoroethylene polymer, etc. The wear resistance, the low-friction characteristic, the cleanability, and the non-attackability to the photosensitive drum are maintained in this way and the improvement in image quality is made.

Description

[Detailed description of the invention]

[0001]

[Industrial application field]

This invention relates to a cleaning blade for an electrophotographic device. [0002]

[Conventional technology]

The cleaning blade method, which is a method for removing residual toner from photosensitive drums and fixing drums (hereinafter referred to simply as drums) for electronic copying machines and other electrophotographic devices, has a simple mechanism and is compact in size. It is most commonly used because it is suitable for However, with cleaning blades made of materials such as urethane rubber, neoprene rubber, and silicone rubber, the higher the force applied to the drum, the greater the friction, which wears out the edge of the blade. If the force is too low, there are many problems such as not being able to scrape off enough toner. Therefore, in order to improve the lubricity of the blade edges, attempts have been made to coat them with solid fluororesin, but the coating blunts the sharp edges that are most important for the blade to perform its function. There is a risk of In addition, a method of coating a metal blade with a solid fluororesin and then polishing it to form a sharp blade has been considered (for example, Japanese Patent Publication No. 77773/1983), but It cannot be said that it is desirable because there is no such thing. In addition, special public service 1596-1596
As shown in Publication No. 7, a blade made of urethane rubber,
Although there is a method in which a silicone oil having a reactive group at the end is reacted, this method is also not at all preferable because the silicone film is removed over time. [0003] Piton (manufactured by Showa Denko), commonly called fluororubber
, Tecnoflon (manufactured by Asahi Glass Co., Ltd.), Daiel (manufactured by Daikin Corporation), etc. were also used, but all of them have fluoroalkyl groups in their molecular structures, so they have poor weather resistance, chemical resistance, and non-adhesion. Although it was excellent, its sliding properties were almost the same as those of the urethane rubber and silicone rubber described above, and were not sufficient. [0004] Furthermore, a method of employing a thermoplastic fluoroelastomer having a block copolymer structure of fluororubber and fluororesin (Japanese Patent Publication No. 144684/1984) was also proposed;
It had poor wear characteristics and was not put into practical use. [0005]

[Problem to be solved by the invention]

As mentioned above, in the conventional technology, cleaning blades are capable of semi-permanently producing good images while maintaining abrasion resistance, low friction characteristics, cleaning performance, and non-aggressiveness to the mating material (photosensitive drum). There is a problem in that it has not been developed yet, and solving this problem has been a challenge. [0006]

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention adopts a means of forming a part including the edge portion or the entire blade from a composition containing fluororubber, a thermoplastic fluororesin, and a low molecular weight fluoropolymer as essential components. This is what I did. The details will be described below. [0007] First, the fluororubber in the present invention is a polymer or copolymer of unit monomers containing one or more fluorine atoms on average, and has a glass transition point below room temperature and is rubbery at room temperature. As long as it has elasticity, it is not particularly limited, and a wide range of examples can be used. Examples of polymerization methods for fluororubber include bulk polymerization, suspension polymerization, emulsion polymerization, solution polymerization, catalytic polymerization, ionizing radiation polymerization, and redox polymerization. In addition, the molecular weight of the fluororubber is usually preferably 50,000 or more, and since the highest possible molecular weight will give good results, it is more preferably 70,000 or more, and particularly preferably about 100,000 to 250,000. Use the one. Typical examples that meet the above conditions are:
Afros manufactured by Asahi Glass Co., Ltd., which is a tetrafluoroethylene propylene copolymer, Piton manufactured by DuPont-Showa Denko Co., Ltd., which is a vinylidene fluoride hexafluoropropylene copolymer, vinylidene fluoride hexafluoropropylene copolymer
Tetrafluoroethylene copolymer Tecnoflon 'I4 Kaihei 3-2695fi4 made by Montefluos; Silastic LS made by Dow Corning, a fluorosilicone elastomer; Firestone WPNP, a phosphazene nilastomer; and Daikin, a perfluoro nilastomer. Examples include Dynyl Perfluor manufactured by Kogyo Co., Ltd. [0008] The thermoplastic fluororesin in the present invention is a polymer having a carbon chain in the main chain and a fluorine bond in the side chain, such as a tetrafluoroethylene polymer (
(hereinafter abbreviated as PTFE), tetrafluoroethylene,
Perfluoroalkyl vinyl ether copolymer (hereinafter referred to as P
(abbreviated as FA), tetrafluoroethylene/hexafluoropropylene/perfluoroalkyl vinyl ether copolymer (hereinafter abbreviated as EPE), tetrafluoroethylene/hexafluoropropylene copolymer (hereinafter abbreviated as F
(hereinafter abbreviated as EP), tetrafluoroethylene-ethylene copolymer (hereinafter abbreviated as ETFE), trifluorochloroethylene polymer (hereinafter abbreviated as CTFE)
1 selected from the group consisting of trifluorochloroethylene/ethylene copolymer (hereinafter abbreviated as ECTFE), polyvinyl fluoride (hereinafter abbreviated as PvF), and polyvinylidene fluoride (hereinafter abbreviated as PVDF)
It is preferable that the polymer is a polymer of more than one species. [0009] Various polymerization methods such as catalytic emulsion polymerization, suspension polymerization, catalytic solution polymerization, gas phase polymerization, and ionizing radiation irradiation polymerization can be employed at the manufacturing stage for any of the above resins, and the molecular weight is 5000.
Desirably less than 0, more than 5000 and approximately 2000
0 or less is particularly desirable [0010] As a representative example that meets the above conditions, the above-mentioned PFA
PFA MPIO manufactured by Mitsui DuPont Fluorochemical Co., Ltd.
Teflon FEP100 manufactured by Mitsui DuPont Fluorochemical Co., Ltd. which is lFEP, Aflon COP manufactured by Asahi Glass Co., Ltd. which is ETFE, KF Polymer manufactured by Kureha Chemical Co., Ltd. which is CTFE manufactured by Daikin Industries, Ltd. NEOFLON CTFESP PVDF
DuPont's Ted 1ar, which is under pX, is mentioned. [0011] The composition obtained by mixing the above-described fluororubber and thermoplastic fluororesin has properties as an elastic body. and,
In order to impart excellent sliding properties, a low molecular weight fluorine-containing polymer is blended. [0012] Here, the low molecular weight fluoropolymer refers to a fluoroolefin polymer such as tetrafluoroethylene (TFE), tetrafluoroethylene/hexafluoropropylene copolymer (FEP), main structural unit -CnH2n-0-(n
is an integer from 1 to 4), the main structural unit [0013]

[0014] Refers to polyfluoroalkyl group-containing compounds (having 2 to 20 carbon atoms) having a molecular weight of 50,000 or less;
The following are particularly desirable: And, among these, the following formula % formula % with an average particle size of 5 μm or less]

[2] ] Tetrafluoroethylene low-order polymers represented by the following are most preferred, and examples thereof include PIDAX AR1 manufactured by DuPont Co., Fluon Lubricant L169 manufactured by Asahi Glass Co., Ltd., and the like. [0017] Next, as the fluoropolyether having the main structural unit of -CnF2n-O- (n is an integer of 1 to 4) and having an average molecular weight of 50,000 or less, [0018]

[0019] Examples include Fomblin Z25 manufactured by Montefluos, Italy; Fomblin Y25 manufactured by Daikin Industries, Ltd.; and Demnum [0019] manufactured by Daikin Industries. In order to improve affinity (adhesion) to other compounding materials and additives, such polymers preferably have structural units containing functional groups such as isocyanate groups, hydroxyl groups, carboxyl groups, and esters. . Therefore, specific examples of such fluoropolyethers include:

[0020]

embedded image HN+CH2-nowNHC〇-〇F20+02F40〇〇〇 [0021] These may be used alone or in combination. Furthermore, even if a fluoropolyether containing activated hydrogen in its functional group is used in combination with an isocyanate compound that does not contain a polyfluoropolyether group, fluoropolyethers having an incyanate group and various fluoropolyethers may be used together. A method may be adopted in which diamines and triamines that do not contain polyether groups or various diols and triols that do not contain fluoropolyether groups are used in combination. In particular, it is preferable to use a combination of fluoropolyethers whose functional groups react with each other to increase the molecular weight, such as combining one with a unit containing an incyanate group and one with a unit containing a hydroxyl group. is equally desirable. [0022] Further, as the polyfluoroalkyl group-containing compound, for example, [0023]

Examples include those having a polyfluoroalkyl group (having 2 to 20 carbon atoms) such as [0024] and having an average molecular weight of 50,000 or less. Specifically, [0025]

A reaction product of a compound having a reactive group and a polyfluoroalkyl group, such as GO [0026], and an ethylenically unsaturated compound having a group that reacts with the reactive group (for example, fluoroalkyl acrylate) ), reaction products of compounds having the above-mentioned reactive groups and polyfluoroalkyl groups with various polymers having groups that react with the reactive groups, and polycondensates of the above-mentioned compounds. In this way, polyfluoroalkyl group-containing compounds, like the above-mentioned fluoropolyethers, are used with highly compatible functional groups, such as isocyanate groups, hydroxyl groups, etc., in order to improve the affinity (adhesion) of other compounding materials and additives. Compounds having units containing a mercapto group, a carboxyl group, an epoxy group, an amine group, a sulfone group, etc. are preferred. [0027] These polyfluoroalkyl group-containing compounds are
They may be used alone or in combination, and a polyfluoroalkyl group-containing compound having a reactive group having activated hydrogen and an isocyanate compound having no polyfluoroalkyl group may be used together. In addition, polyfluoroalkyl group-containing compounds having isocyanate groups and various diamines not containing polyfluoroalkyl groups,
Methods such as using triamines or various polyfluoroalkyl group-free diols and triols in combination may be employed. A combination of functional groups is preferred from the viewpoint of increasing strength, and specifically has a polyfluoroalkyl group having 2 to 20 carbon atoms and contains at least one type selected from a hydroxyl group, a mercapto group, a carboxyl group, and an amino group. A combination with a fluorine-containing polymer, or a polyfluoroalkyl group having 2 to 20 carbon atoms, and
List the combination of a fluoropolymer having a unit containing an isocyanate group and a fluoropolymer having a polyfluoroalkyl group having 2 to 20 carbon atoms and a unit containing a reactive group having activated hydrogen. I can do it. [0028] Among these low molecular weight fluorine-containing polymers, when a fluoroolefin polymer or a fluoropolyether is used, excellent results in lubricity can be obtained, and in particular, when a fluoroolefin polymer is used, the most desirable results can be obtained. It's clear. [0029] The blending ratio of the above-mentioned fluororubber, thermoplastic fluororesin, and low molecular weight fluoropolymer is preferably from 50:50 to 95:5 in terms of weight ratio of fluororubber to thermoplastic fluororesin. This is because if the weight ratio of the thermoplastic fluororesin exceeds 50/100, the target composition will not have sufficient elastic properties, and if the weight ratio is less than 5/100, sufficient wear resistance will not be obtained. be. Furthermore, the low molecular weight fluoropolymer is preferably used in an amount of 5 to 50 parts by weight based on a total of 100 parts by weight of the fluororubber and the thermoplastic fluororesin. This is because if the blending ratio of the low molecular weight fluoropolymer is less than 5 parts by weight, sufficient sliding properties cannot be obtained, and if it exceeds 50 parts by weight, the rubber-like elastic properties are impaired. [00301] Furthermore, a hardened powder of a thermosetting resin that does not melt at 300 degrees or a heat-resistant resin powder having a glass transition point of 300 degrees or higher can be added to the above components to improve wear resistance. Examples of thermosetting resin powder include phenolic resin,
Examples of heat-cured fine powders such as epoxy resins and heat-resistant resins having a glass transition point of 300 degrees or higher include fine powders such as polyimide resins and aromatic aramid resins. Among commercially available resin powders, hardened and crushed phenol resin products include Bellvar H3O0 manufactured by Kanebo Co., Ltd., and PWA20 manufactured by Mikasa Sangyo Co., Ltd. as hardened and crushed polyimide resin powders.
As a crushed product of aromatic aramid resin, manufactured by Asahi Kasei Co., Ltd.:
MP-P, a thermosetting resin powder with a glass transition point Tg of 300 degrees or higher, is Upilex S (manufactured by Ube Industries, Ltd.).
Tg>500). The particle size of such thermosetting resin powder is preferably 1 to 15 μm in terms of maintaining rubber-like elasticity and facilitating the wire crossing process. The thermosetting resin powder may be added in an amount of 5 to 20% by weight based on the essential components. If it is less than 5% by weight, it will not have the effect of improving wear resistance, and if it exceeds 20% by weight, the rubber elasticity will decrease. Undesirable. [0031] In addition, various additives may be blended in addition to the above-mentioned components within a range that does not impair the purpose of the present invention. For example, as vulcanizing materials for fluororubber, isocyanurates, organic peroxides, etc., antioxidants or acid acceptors such as sodium stearate, magnesium oxide, calcium hydroxide, antistatic agents such as carbon, silica, alumina, etc. Needless to say, fillers, other metal oxides, colorants, flame retardants, etc. may be added as desired. [0032] The method of mixing the various raw materials described above is not particularly limited, and any commonly used method may be used, such as mixing the elastomer and other raw materials as the main raw material individually or simultaneously using a roll mixer or other means. It can be mixed using a machine. At this time, it is desirable to provide a temperature regulator to prevent heat generation due to friction. Further, when using a roll mixer, it is even better to tighten the roll spacing to about 3 mm or less and perform thin threading as the final mixing. [003'3] The cleaning blade of the present invention does not require any particularly limited means in the molding process, and is subjected to primary vulcanization (10 to 10 degrees at 140 to 170 degrees) by a normal press molding method.
After applying a pressure of 5 to 10 kgf/cm2 for 30 minutes, it is subjected to secondary vulcanization (2 to 20 hours at 200 to 300 degrees, no pressure) and formed into a sheet, and the desired blade shape is formed from the obtained sheet. All you have to do is cut it. Alternatively, the edge portion serving as the cutting edge of the blade or one side portion of the blade including the edge portion may be molded with a composition containing the above-mentioned essential components, and the other side portion of the blade may be composite molded with general synthetic rubber. The general synthetic rubbers mentioned above include vulcanized rubbers such as nitrile rubber, chloroprene rubber, butazinine rubber, urethane rubber, styrene rubber, butyl rubber, acrylic rubber, silicone rubber, ethylene rubber, and fluorine rubber, or urethane, polyester, polyamide, and vinyl chloride. Examples include thermoplastic elastomers such as , polybutadiene, and soft nylon; and liquid nilastomers such as liquid urethane and liquid butazinine.

[0034]

[Effect]

The cleaning blade of the present invention described above is made of a composition that uses a combination of fluororubber, thermosetting fluororesin, and low molecular weight fluoropolymer, so it has excellent abrasion resistance, low friction characteristics, cleaning performance, and mating material ( Extremely non-aggressive to photosensitive drums). [0035]

【Example】

The raw materials used in the Examples and Comparative Examples are collectively shown below, and the abbreviations are shown in [ ]. In addition, the blending ratio of each component is all weight%, but (1) to (7)
For the raw materials shown in (8) to (22), the percentage is by weight based on the total weight of the raw materials shown in (8) to (22).

(1) Tetrafluoroethylene/propylene copolymer C
AFLAS ) (manufactured by Asahi Glass/Japan Synthetic Rubber Co., Ltd.: A
FLAS 150P) (2) Vinylidene fluoride/fluoropropylene copolymer [Technoflon] (manufactured by Asahi Monte Co., Ltd.: Tecnoflon FOR420) (3) Vinylidene fluoride/fluoropropylene copolymer [Pyton] (Showa Denko/DuPont) Manufactured by: Paiton B
50) (4) Fluorosilicone elastomer (Dow Corning Nijilastic LS) (5) Perfluoro elastomer (Daikin Corporation: Daiel Perflo GA50) (6) Tetrafluoroethylene/ethylene copolymer CETFE] ( (7) Tetrafluoroethylene/perfluoroalkylvinylnythyl copolymer CPFA (manufactured by DuPont Mitsui Fluorochemicals: PFA-MPIO) (8) Low molecular weight fluoropolymer (Low molecular weight TFE) (Nilubrican manufactured by Asahi Glass Co., Ltd.) L1 (9) Low molecular weight fluoropolymer [Low molecular weight FPE (fluoropolyether)] Manufactured by Inmoto Enimon Co., Ltd.: Fomblin Z-Doll) (10 High molecular weight PT
FE (Mitsui DuPont Fluorochemical Co., Ltd.: Teflon 7
J) (11 Silicone resin (Nidrefil manufactured by Toray Silicone) (12 Carbon (manufactured by Van der Bilt):
MT carbon) (13 Sodium stearate (general industrial material) (14 Organic peroxide (αα"-bis(t-butylperoxy) diisopropylbenzene) (15 Polyfunctional monomer [TAIC) () Realyl isocyanurate) (16 Magnesium oxide (general reagent) (17 Calcium hydroxide (general reagent)) (18 Phenol resin (manufactured by Kanebo: Bell Pearl H3)
O0) 19 imide resin (manufactured by Ube Industries: Upilex 5) 20 imide resin (manufactured by Mikasa Sangyo Co., Ltd.: PWA20)
21 Vulcanizing agent (manufactured by Showa Denko/DuPont: Curateve #
20) 22 vulcanizing agent (manufactured by Showa Denko/DuPont: Curateve #30). [0037] Examples 1 to 3 First, AFLAS (1) was wound around a roll mixer whose roll spacing was adjusted to about 5 to 10 mm, and sodium stearate (13) and MT carbon (12 ), ETFE (6), and TAIC (15) were added and kneaded. Thereafter, the roll interval was adjusted to 1 mm, and mastication was performed about 10 times. In addition, in order to prevent frictional heat at this time, cooling water was constantly passed through the roll to maintain the roll temperature at 60 degrees or less. Next, stop the cooling water, pass steam through the rolls, adjust the rubber temperature to 70 degrees or more and 90 degrees or less, and then increase the roll interval by 5 to 10 degrees.
The mixture was kneaded at the mixing ratio of each example shown in Table 1 while adding the low molecular weight fluoropolymer (8) or (9) little by little. Thereafter, the distance between the rolls was again narrowed to 1 mm and mastication was performed about 10 times. [0038] Through the above steps, the length is 400 mm, the width is 300 mm, and the thickness is 1 mm.
Each compound formed into a sheet was subjected to secondary vulcanization (170 degrees, 10 minutes, press pressure 7 kgf/cm2).
) and secondary vulcanization (230 degrees, 16 minutes, free heating)
Friction and abrasion characteristics, non-adhesiveness, lifespan, and elastic properties were determined for each sheet after vulcanization. Each test method is as follows.

[O○39] (1) Friction/wear test: The obtained sheet was tested with an outer diameter of 21 mm, an inner diameter of 17 mm, and a thickness of 2.
Punch out an annular shape with an outer diameter of 21 mm and an inner diameter of 17 mm.
Glued to an aluminum jig with a thickness of 10 mm and a thickness of 10 mm.
This was used as a friction and wear test piece. The coefficient of friction was measured using a thrust-type friction tester under the conditions of a sliding speed of 1 m/min and a surface pressure of 3 kgf/cm2, and the coefficient of friction was determined by those with small fluctuations over time (○
It was evaluated in two stages: relatively large (marked) and relatively large (marked x). In addition, the wear coefficient is sliding speed 30m/min, surface pressure 1kg
It was measured using a thrust type friction and wear tester under the condition of f/crn2. [0040] (2) Non-adhesiveness: In order to confirm the specific tackiness with the toner, the contact angle of the surface of the test piece with water was measured using a goniometer-type contact angle measuring device in each test, and the larger the contact angle, the more non-adhesive it was. The adhesiveness was judged to be good. [0041] (3) Lifespan: Instead of the cleaning blade of the copying machine (manufactured by Ricoh Co., Ltd.: 5-2), use a cleaning blade of the same size as this.
A blade was produced by cutting from a molded sheet, and this was used as a test piece. This test piece was attached to a copying machine, and continuous copying was performed using toner containing no lubricant, and the number of copies until the copied image became defective was defined as the life span. [0042] (4) Elastic body properties: The tensile strength at break, tensile elongation at break, and hardness (JIS-A) of the obtained sheet-like test piece were examined according to JIS-6301. [0043] The results of the above tests are summarized in Tables 2 and 3. [0044]

[Table 1] [0045]

[Table 2] [0046]

[Table 3] [0047] Examples 4 to 7 In Example 4, the fluororubbers were each treated with Technoflon (2
) Pyton (3) Fluorosilicone elastomer (4) Perfluoro elastomer (5) was mixed, sheet-formed, and vulcanized in exactly the same manner as in Examples 1 to 3 at the proportions shown in Table 1. Ta. Also,
The preparation of the test piece and the testing method were also exactly the same as in Examples 1 to 3. The results are shown in Table 2. [0048] Examples 8 to 10 In Examples 8 to 10, fluororubber Tecnoflon (
2), other raw materials including thermosetting resin powders (18) to (20) were mixed in the proportions shown in Table 1 in exactly the same manner as in Examples 1 to 3, and sheet molded and vulcanized. I did this. In addition, preparation of test pieces and test methods were also carried out in Examples 1 to 3.
We used exactly the same method. The results are shown in Table 2. [0049] Comparative Examples 1 to 7 In Comparative Examples 1 to 7, raw materials were blended in the proportions shown in Table 1,
Mixing, sheet forming, and vulcanization were performed in exactly the same manner as in Examples 1 to 3. In addition, the preparation and testing of test pieces were conducted in exactly the same manner as in Examples 1 to 3. The results are shown in Table 2.

Comparative Example 8 Commercially available curable urethane rubber sheet (length 400 x width 400
x length 2 mm) and evaluated using the same test method as in Example 1. The results are shown in Table 2. As is clear from Tables 2 and 3, in Comparative Examples 1 to 8, the friction coefficient was large at 0.7 or more from the beginning of the test, and in particular, in Comparative Examples 4.6 and 8, the friction coefficient of this test machine was It exceeded the measurement limit of 1.5. These sliding conditions were poor, with continuous stick-slip rather than slip, and the friction amplitude was large. Further, in the actual machine durability test, Comparative Examples 1 to 7 were able to copy less than 50,000 copies, and Comparative Example 8 was able to copy only about 100,000 copies. However, A
In Examples 1 to 3, in which FLAS (1) was blended with a thermoplastic fluororesin and a low molecular weight fluoropolymer, the change in friction coefficient over time was stable at a low value of 0.24 to 0.27, and the wear was reduced. The coefficient was also good at 100 or less, which is a measure of wear resistance. In particular, in an actual machine durability test, it had a copying durability of over 500,000 copies. [0051] In addition, fluororubber can be used as Technoflon (2) or Paiton (
3) Examples 4 to 7, which were kneaded as fluorosilicone nilastomer (4) and perfluoro elastomer (5), had similar results to Examples 1 to 3. In Examples 8 to 10 in which a thermosetting resin was added, the abrasion resistance was particularly poor.

【○052】

【Effect of the invention】

Claims (8)

[Claims] [Claim 1] A cleaning blade for an electrophotographic device, in which a part including the edge portion or the entire blade is made of a composition containing fluororubber, a thermoplastic fluororesin, and a low molecular weight fluoropolymer as essential components. Cleaning blade. 2. The cleaning blade according to claim 1, wherein a cured powder of a thermosetting resin or a heat-resistant resin powder having a glass transition point of 300 degrees or higher is added to the composition. Claim 3: The molecular weight of the fluororubber is 100,000 to 25.
The cleaning method according to claim 1 or 2, which is
blade. 4. The thermoplastic fluororesin is a tetrafluoroethylene polymer, a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer, a tetrafluoroethylene/hexafluoropropylene/perfluoroalkyl vinyl ether copolymer, a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer, or a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer.
One or more types selected from the group consisting of hexafluoropropylene copolymer, tetrafluoroethylene/ethylene copolymer, trifluorochloroethylene polymer, trifluorochloroethylene/ethylene copolymer, polyvinyl fluoride, and polyvinylidene fluoride. The cleaning blade according to claim 1 or 2, which is a polymer. Claim 5: The low molecular weight fluoropolymer has a molecular weight of 5000.
The cleaning blade according to claim 1 or 2, which is a polymer of: 6. The cleaning method according to claim 1 or 2, wherein the low molecular weight fluoropolymer is one or more polymers selected from the group consisting of fluoroolefin polymers, fluoropolyethers, and polyfluoroalkyl group-containing compounds.
blade. 7. The cleaning blade according to claim 1, wherein the low molecular weight fluoropolymer is a tetrafluoroethylene low-order polymer. 8. The weight ratio of fluororubber and thermoplastic fluororesin is in the range of 50:50 to 95:5, and the amount of low molecular weight fluoropolymer per 100 parts by weight of the total is 5 to 5.
The cleaning agent according to claim 1 or 2, which contains 0 parts by weight.
blade.