JP2002037843A - Member for image formation device, and image formation device by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member for an image formation device which does not break even when affecting excessive forces are loaded to the member when a plain paper (replication material) is jamming, while keeping sufficient strength without spoiling necessary characteristics of the member for the image formation device and to provide the image formation device equipped with the same. SOLUTION: The member for the image formation device comprises polyurethane obtained by a curing reaction mainly of a isocyanate component and a polyol component. The polyol component contains the polymer polyol of 5-95 wt.% to whole polyol, in which the one kind or two or more kinds of compound selected from the group of acrylonitrile, styrene or ethylene unsaturated compound is graft-copolymerized. The image formation device which is equipped with the same is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus member used in an image forming apparatus such as an electrophotographic apparatus, an electrostatic recording apparatus, and a toner flying recording apparatus, and more particularly, to a recording medium such as plain paper. An image forming apparatus member that maintains sufficient strength even if an excessive stress is applied to the member during jamming by the (transfer material) and does not cause such a problem that the member is torn, and an image forming apparatus equipped with the member. It is about.

[0002]

2. Description of the Related Art In recent years, with the development of electrophotographic technology, image forming apparatuses such as dry electrophotographic apparatuses have been used for charging, developing, and the like.
As a member provided for transfer, toner (developer) supply, cleaning, and the like, a polymer elastic member has attracted attention, and the elasticity of a charging roller, a developing roller, a transfer roller, a toner supply roller, a cleaning roller, etc. Rollers, toner layer regulating blades, cleaning blades, and other elastic blades. For the image forming apparatus members used for these purposes, a polymer elastomer or a polymer foam having rubber elasticity is used as a material, and the image forming apparatus members are low in hardness, and the image carrier and the transfer material are used. It is required that the toner does not fuse with the toner without contamination. Here, the materials constituting the polymer elastomer or the polymer foam include isoprene rubber, ethylene propylene rubber, silicone rubber,
Solid rubber vulcanizates such as epichlorohydrin rubber and acrylonitrile butadiene rubber, and polyurethanes obtained by curing liquid raw materials such as polyols with isocyanate are used. An image forming apparatus member made of these materials may be required to have conductivity. For example, a predetermined electrical conductivity may be obtained by mixing a conductive material such as carbon black or a metal oxide, or adding an electrolyte. Adjusted to the resistance value. Here, since there is little variation in the position of the electric resistance and there is little voltage dependence of the electric resistance, polar polymers such as epichlorohydrin rubber, acrylonitrile butadiene rubber, polyurethane, alkali metals, alkaline earth metals, quaternary ammonium, etc. It is advantageous to add an electrolyte such as chloride, perchloric oxide, borofluoride, alkyl sulfate, carboxy oxide, etc. to impart conductivity, especially ease of production, raw material price, long-term electricity From the viewpoint of stability of resistance, polyurethane to which conductivity is imparted by a quaternary ammonium salt or the like is preferably used.

However, as the speed of the image forming apparatus is increased, a recording medium (transfer material) such as plain paper exerts an excessive stress on the member during jamming or the like, and the member is torn to cause image defects. In addition, there is a problem in that the pieces of the torn member are clogged in the rotating portion inside the machine, and the image forming apparatus cannot be operated.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and does not impair the various performances required for the members of the image forming apparatus. It is an object to provide a forming apparatus.

[0005]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventor has found that in an image forming apparatus member made of polyurethane obtained by reacting and curing an isocyanate component and a polyol component, It has been found that by using a polyol containing a specific amount of a specific polyol as the polyol component, sufficient strength can be imparted without impairing various properties required for the members of the image forming apparatus. The present invention has been completed based on such findings. That is, the present invention provides an image forming apparatus member comprising a polyurethane obtained by reacting and curing an isocyanate component and a polyol component, wherein the polyol component is selected from the group consisting of acrylonitrile, styrene and an ethylenically unsaturated compound. An image forming apparatus member comprising a polymer polyol obtained by graft-polymerizing one or more kinds of compounds to a polyol to a polyol component in an amount of 5 to 95% by weight, and an image forming apparatus equipped with the member. Things.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, as a polyol component, a polymer polyol obtained by graft-polymerizing one or more compounds selected from the group consisting of acrylonitrile, styrene and an ethylenically unsaturated compound to a polyol is used. By using a polyol component containing such a specific polymer polyol in an amount of 5 to 95% by weight based on the total polyol component, a sufficient strength can be obtained without impairing various properties as an image forming apparatus member.
The content of the specific polymer polyol is preferably from 10 to 85% by weight based on all the polyol components. here,
Acrylonitrile, styrene and a polyol for graft polymerization of one or more compounds selected from the group of ethylenically unsaturated compounds are preferably polyether polyols in terms of moisture resistance, and ethylene oxide and propylene oxide are used. It is more preferable to use an addition-polymerized polyether polyol or polytetramethylene ether glycol. In this case, with respect to the ratio of ethylene oxide to propylene oxide and the microstructure to be added to the polyether polyol obtained by addition polymerization of ethylene oxide and propylene oxide, the ratio of ethylene oxide is preferably from 2 to 80% by weight, more preferably from 5 to 25% by weight. % By weight. Those having ethylene oxide added to the terminal are preferably used. Also, the arrangement of ethylene oxide and propylene oxide in the molecular chain is preferably random. When the molecular weight of the polyether polyol is bifunctional, the weight average molecular weight is preferably in the range of 300 to 6,000, particularly preferably in the range of 400 to 3,000. 3
In the case of the functional group, the weight average molecular weight is preferably in the range of 900 to 9,000, and particularly preferably in the range of 1,500 to 6,000. When graft-polymerizing acrylonitrile, styrene and one or more compounds selected from the group of ethylenically unsaturated compounds to polytetramethylene ether glycol, the weight average molecular weight of polytetramethylene ether glycol is 400 to 4,000. The range is preferably, and particularly preferably 650 to 3,000.

As the remaining polyol component constituting the polyurethane, a polyether polyol or a polyester polyol is used, and a polyether polyol obtained by addition-polymerizing ethylene oxide and propylene oxide is particularly preferable. Polyether polyol obtained by addition polymerization of ethylene oxide and propylene oxide is water,
Propylene glycol, ethylene glycol, glycerin, trimethylolpropane, hexanetriol, triethanolamine, diglycerin, pentaerythritol, ethylenediamine, methylglucodite, aromatic diamine, sorbitol, sucrose, phosphoric acid, etc. Those obtained by addition polymerization of propylene oxide can be mentioned. In particular, water, propylene glycol, ethylene glycol, glycerin,
Those starting from trimethylolpropane or hexanetriol are preferred. Regarding the ratio of ethylene oxide to propylene oxide and the microstructure to be added, the ratio of ethylene oxide is preferably from 2 to 80% by weight, more preferably from 5 to 25% by weight. Those having ethylene oxide added to the terminal are preferably used. Also, the arrangement of ethylene oxide and propylene oxide in the molecular chain is preferably random.

The molecular weight of this polyether polyol is
When water, propylene glycol or ethylene glycol is used as a starting material, it becomes bifunctional and has a weight average molecular weight of 30.
Those having a range of 0 to 6,000 are preferred, and particularly 400 to 3,
000 is preferred. When glycerin, trimethylolpropane or hexanesantriol is used as a starting material, it becomes trifunctional and has a weight average molecular weight of 90.
Those having a range of 0 to 9,000 are preferable, and in particular, 1,500 to
Those in the range of 6,000 are preferred. In addition, a bifunctional polyol and a trifunctional polyol can be appropriately blended and used.

[0009] Polytetramethylene ether glycol may be included as a polyol component constituting the polyurethane. Polytetramethylene ether glycol is obtained, for example, by cationic polymerization of tetrahydrofuran, and preferably has a weight average molecular weight in the range of 400 to 4,000, particularly preferably 650 to 3,000. It is also preferable to blend polytetramethylene ether glycols having different molecular weights. Furthermore, polytetramethylene ether glycol obtained by copolymerizing an alkylene oxide such as ethylene oxide or propylene oxide can also be used.

It is also preferable to use a polyether polyol obtained by addition polymerization of ethylene oxide and propylene oxide and a polytetramethylene ether glycol. In this case, a polyether polyol obtained by addition polymerization of ethylene oxide and propylene oxide and a polytetramethylene ether are used. The ratio of ether glycol is 9
It is preferably used so as to be in the range of 0:10 to 10:90, more preferably in the range of 70:30 to 40:60.

[0011] Further, a polyester polyol obtained by condensing an acid component such as adipic acid and a glycol component such as ethylene glycol with a polyol obtained by adding a melamine to the polyol together with the above-mentioned polyol component as long as the object of the present invention is not impaired. Polyester polyols obtained by ring-opening polymerization of ε-caprolactam, diols such as polycarbonate diol and butanediol, polyols such as trimethylolpropane, and derivatives thereof can be used in combination.

As the isocyanate component constituting the polyurethane material, tolylene diisocyanate, diphenylmethane diisocyanate or a derivative thereof is used. Examples of tolylene diisocyanate or derivatives thereof include crude tolylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate. A mixture of nates, urea-modified products thereof, buret-modified products, carboxyimide-modified products, urethane-modified products modified with a polyol or the like are used. As diphenylmethane diisocyanate or a derivative thereof, diphenylmethane diindianate obtained by phosgenating diaminodiphenylmethane or a derivative thereof is used. There are polynuclear derivatives as diaminodiphenylmethane derivatives, and pure diphenylmethane diisocyanate obtained from diaminodiphenylmethane and polymeric diphenylmethane diisocyanate obtained from polynuclear diaminodiphenylmethane can be used in the present invention. The functional group number of the polymer diphenylmethane diisocyanate is generally a mixture of pure diphenylmethane diisocyanate and a polymer diphenylmethane diisocyanate having various functional groups, and the average functional group number is preferably 2.05 to 4.00, more preferably. Used is from 2.50 to 3.50. Derivatives obtained by modifying these diphenylmethane diisocyanates or derivatives thereof,
For example, urethane modified products modified with polyols and the like, dimers formed by uretidione formation, isocyanurate modified products, carboxyimide / uretonimine modified products, allohanate modified products, urea modified products, buret modified products, and the like can be used. Particularly preferred are urethane-modified products and carboximide / uretonimine-modified products.

In the present invention, tolylene diisocyanate or a derivative thereof, diphenylmethane diisocyanate or a derivative thereof may be used alone, or two or more kinds may be used in combination. In addition, various aliphatic isocyanates such as hexamethylene diisocyanate, alicyclic isocyanates such as isophorone diisocyanate, and derivatives thereof can be used in combination. The amount of the isocyanate component is determined by the ratio of the isocyanate group in the isocyanate component to the hydroxyl group in the polyol component.
It is preferable to set the compounding amount such that the molar ratio of the group / OH group is 0.9 to 1.5, and more preferably 1.0 to 1.2.
Range.

When imparting conductivity to the members of the image forming apparatus, a conductivity-imparting material is mixed or dissolved in a polyurethane material constituting the members of the image forming apparatus. The conductivity-imparting material includes a conductive material and an electrolyte. Examples of the conductive material include carbon black such as oil furnace black including gas black and ink black, thermal black, channel black, and lamp black; and conductive materials such as conductive zinc white. And metal oxides. The amount of the conductive material is preferably 0.5 to 20 parts by weight, more preferably 1 to 10 parts by weight, based on 100 parts by weight of the polyurethane material. Examples of the electrolyte include tetraethylammonium, tetrabutylammonium, dodecyltrimethylammonium (eg, lauryltrimethylammonium), hexadecyltrimethylammonium, octadecyltrimethylammonium (eg, stearyltrimethylammonium),
Quaternary ammonium salts such as benzyltrimethylammonium, modified fatty acid dimethylethylammonium, lauroylaminopropyldimethylethylammonium, perchlorates such as alkali metals and alkaline earth metals such as lithium, sodium, potassium, calcium and magnesium; Chlorate, hydrochloride, bromate, iodate, borofluoride, sulfate, alkyl sulfate, carboxylate, sulfonate, trifluoromethyl sulfate and the like can be mentioned. Among these, a quaternary ammonium salt of an alkyl sulfate or a quaternary ammonium salt of a polybasic carboxylic acid is preferable, and an alkyl sulfate of a quaternary ammonium having an amide bond is particularly preferable. The amount of the electrolyte is preferably 0.01 to 10 parts by weight, more preferably 0.1 to 3 parts by weight, based on 100 parts by weight of the polyurethane material. A filler, an antioxidant, a low-friction agent, a charge control agent, and the like can be added to the polyurethane material in addition to the conductivity-imparting material.

As a reaction catalyst for curing a polyurethane composition containing a polyurethane material and a conductivity-imparting material, for example, monoamines such as triethylamine and dimethylcyclohexylamine, tetramethylethylenediamine, tetramethylpropanediamine, and tetramethylhexanediamine Diamines such as pentamethyldiethylenetriamine, pentamethyldipropylenetriamine,
Triamines such as tetramethylguanidine, cyclic amines such as triethylenediamine, dimethylpiperazine, methylethylpiperazine, methylmorpholine, dimethylaminoethylmorpholine, dimethylimidazole, dimethylaminoethanol, dimethylaminoethoxyethanol, trimethylaminoethylethanolamine, methyl Alcohol amines such as hydroxyethylpiperazine, hydroxyethylmorpholine, bis (dimethylaminoethyl) ether, ethylene glycol bis (dimethyl)
Ether amines such as aminopropyl ether, stannas octoate, dibutyltin diacetate, dibutyltin dilaurate, dibutyltin marker, dibutyltin thiocarboxylate, dibutyltin dimaleate, dioctyltin marker, dioctyltin thiocarboxylate, phenylmercurypropion And organometallic compounds such as lead octenoate. Of these, organotin catalysts are particularly preferred. These catalysts may be used alone or in combination of two or more.

When the polyurethane member is formed into a foam, it is preferable to mix various surfactants and silicone foam stabilizers with the polyurethane composition in order to stabilize the cells of the foam material. As the silicone foam stabilizer, a dimethylpolysiloxane-polyoxyalkylene copolymer or the like is suitably used, and is composed of a dimethylpolysiloxane portion having a molecular weight of 350 to 15,000 and a polyoxyalkylene portion having a molecular weight of 200 to 4,000. Is particularly preferred.
As the molecular structure of the polyoxyalkylene portion, an ethylene oxide addition polymer or a co-addition polymer of ethylene oxide and propylene oxide is preferably used, and it is also preferable that the molecular terminal is ethylene oxide.
Examples of the surfactant include an ionic surfactant such as a cationic surfactant, an anionic surfactant, and an amphoteric surfactant, and a nonionic surfactant such as various polyethers and various polyesters. The compounding amount of the silicone foam stabilizer and various surfactants is preferably 0.1 to 10 parts by weight, preferably 0.5 to 5 parts by weight, per 100 parts by weight of the polyurethane material.
More preferably, the amount is by weight.

As a foaming method for producing the polyurethane foam, for example, a method using a foaming agent such as water, an organic solvent, various alternative fluorocarbons, and a method of mixing bubbles by mechanical stirring are preferably used. In this case, a method of mixing bubbles with a mechanical stirring frame is particularly preferable. The expansion ratio of the polyurethane foam is 500 μm.
And preferably less than 200 μm, and the bulk density is in the range of 0.2 to 0.7 g / ml, especially
It is preferably in the range of 0.3 to 0.6 g / ml.

The blending and heat curing in the production of the polyurethane member are carried out by mixing and stirring the above-mentioned polyol component, isocyanate component, conductivity-imparting material, reaction catalyst and various optional components used as required. A method of mixing air bubbles by a method, casting the mixture into a predetermined mold or the like, or performing free foaming in a block shape, and then heating and curing is preferably used.

Further, a polyol component and an isocyanate component are reacted in advance to prepare a prepolymer having an isocyanate group, and this is mixed with ethylene glycol, 1,4-butanediol, trimethylolpropane or a molecular weight of 40.
A prepolymer method of curing with a chain extender such as a polyol of 0 to 5,000 can also be used. In particular, ethylene oxide having a primary terminal hydroxyl group and propylene oxide addition polymerization type diol, triol, polytetramethylene Ether glycol is preferably used.

The image forming apparatus member of the present invention includes an image forming apparatus member made of a metal member and the above-mentioned polyurethane. Its structure is a metal member such as zinc or the like plated on a steel material such as sulfur free-cutting steel or a metal member such as aluminum, stainless steel, phosphor bronze, and a part or the whole of which is covered with a polyurethane member. It is used in the form of a roller, a drum, a blade or the like depending on the application. That is, when the image forming apparatus member is a conductive roller as an example, a core metal obtained by plating zinc or the like on a sulfur free-cutting steel or the like is coated in a cylindrical shape with a polyurethane member, and further necessary. Accordingly, a material having a conductive, semiconductive or insulating paint applied to the outside thereof can be exemplified.

The joining method of the metal member and the polyurethane member includes a method in which the metal member is disposed in the mold in advance and the polyurethane material is cast and cured, and a method in which the polyurethane member is molded into a predetermined shape and then bonded. Can be used. In either method, an adhesive layer can be provided between the metal member and the polyurethane member as necessary,
An adhesive made of a conductive paint, a hot melt sheet, or the like can be used. The method of molding a polyurethane member of the present invention is, in addition to the method of casting into a mold having a predetermined shape as described above, a method of cutting a block to a predetermined size by cutting, a method of polishing to a predetermined size, or a method of polishing. And the like can be combined as appropriate. The image forming apparatus member of the present invention can be exemplified by a charging member, a developing member, a transfer member, a cleaning member, and the like as an image forming apparatus member used in contact with an image carrier such as a photoconductor. Examples of the image forming apparatus members used include a developing member, a developer supply member, a cleaning member, a developer layer regulating member, and the like. These members can be used in the form of a roller or a blade.

FIG. 1 is an explanatory view showing an example of an electrophotographic image forming apparatus in which the member of the image forming apparatus of the present invention is mounted as a transfer roller, in which a toner supply roller 3 and an electrostatic latent image are held. A developing roller 2 is provided between the image carrier 1 and an outer peripheral surface of the developing roller 2 on a recording medium such as paper (transfer material).
8 shows a structure in which the transfer roller 5 according to the present invention is brought into contact with the transfer roller 8 through the transfer roller 8. When the transfer material 8 does not pass, the transfer roller 5 is in contact with the image carrier 1. By rotating the toner supply roller 3, the developing roller 2, and the image carrier 1 in the direction of the arrow, the toner is supplied to the toner supply roller 3.
Is supplied to the surface of the developing roller 2, and is formed into a uniform thin layer by the layer regulating blade 4.
Attach to the upper latent image and the latent image is visualized. Then, by generating an electric field between the image carrier 1 and the transfer roller 5, the toner image on the image carrier 1 is transferred to the transfer material 8. A cleaning roller 6 removes toner remaining on the surface of the image carrier 1 after transfer. Reference numeral 7 denotes a charging roller.

[0023]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Example 1 Roller Production Propylene oxide and ethylene oxide were randomly added to glycerin, the content of ethylene oxide units was 16% by weight, the number of substantial functional groups was 3, the weight average molecular weight was 5,000, and the OH value was 34 mg KOH / g of polyether polyol 80 parts by weight, propylene oxide and ethylene oxide were randomly added to glycerin,
Acrylonitrile is graft-polymerized to a polyether polyol having 3 functional groups and a weight average molecular weight of 5,000,
20 parts by weight of a polymer polyol having a weight ratio of the polyether component to the acrylonitrile component of 80:20, and a mixture of diphenylmethane diisocyanate, urethane-modified diphenylmethane diisocyanate and carboxyimide-modified diphenylmethane diisocyanate, and an isocyanate content of 26.3 parts by weight % Isocyanate (11.2 parts by weight), 4 parts by weight of a silicone foam stabilizer having an OH value of 32 mgKOH / g of a dimethylpolysiloxane-polyoxyalkylene copolymer, and ethyl sulfate-modified aliphatic diethyl 0.4 as an electrolyte.
Parts by weight, 0.04 parts by weight of dibutyltin dilaurate, and an OH value of 45 mg KO obtained by dispersing a black pigment in a polyol.
H / g of 2.5 parts by weight of a black colorant was mixed while being foamed by mechanical stirring, and the mixture was poured into a mold provided around a metal shaft having a diameter of 6 mm.
The mixture was cured at 0 ° C. for 10 hours to prepare a urethane foam roller having a diameter of 16.5 mm and a length of 215 mm. The physical properties of the roller and the bulk density of the image evaluation foam part were 0.40 g / ml, and the Asker C hardness was 33 °. 5mm thick roller
Was placed on an aluminum plate, and the electric resistance between the shaft and the copper plate was measured while pressing both ends of the roller with a force of 500 g each. The temperature and humidity at the time of measurement were 23 ° C. and 50%, respectively, and the electric resistance was 10 ^7.78 [Ω] when the applied voltage was 1,000 V.
Met. This roller is incorporated as a transfer roller in the image forming apparatus shown in FIG.
When a grayscale, solid black, and solid white image was printed in an environment of 0%, good images were obtained for all of the grayscale, solid black, and solid white. Evaluation of Long-Term Durability Then, 50,000 gray scale images were printed on the roller in an image forming apparatus shown in FIG. 1 under the environment of a temperature and a humidity of 23 ° C. and 50%, respectively. Although paper jamming occurred more than ten times during printing, a good image was obtained until printing of 50,000 sheets was completed.

Comparative Example 1 Preparation of Roller Propylene oxide and ethylene oxide were randomly added to glycerin. The content of the ethylene oxide unit was 16% by weight, the substantial number of functional groups was 3, and the OH value was 5,000. Is a mixture of diphenylmethane diisocyanate, urethane-modified diphenylmethane diisocyanate, and carboxyimide-modified diphenylmethane diisocyanate, and 11.8 parts by weight of isocyanate having an isocyanate content of 26.3% by weight. Dimethylpolysiloxane-polyoxyalkylene copolymer having an OH value of 32 m
gKOH / g 4 parts by weight of silicone foam stabilizer, 0.4 parts by weight of ethyl sulfate-modified aliphatic diethyl as electrolyte, 0.04 parts by weight of dibutyltin dilaurate, and an OH value of 45 mgKOH / g obtained by dispersing a black pigment in a polyol Was mixed while foaming by mechanical stirring, and a urethane foam roller was produced in the same manner as in Example 1. Roller physical properties and image evaluation Roller physical properties were evaluated in the same manner as in Example 1. The bulk density of the foam portion was 0.40 g / ml, Asker C hardness was 31 °, electric resistance was ^107.75 Ω, gray scale, Good images were obtained for both solid black and solid white. When the durability was evaluated in the same manner as in Example 1 at the time of printing about 13,000 sheets, there was a fourth per-jamming and the roller end was chipped. When the durability evaluation was further continued, the broken pieces of the roller narrowed in the driving portion of the image forming apparatus, which hindered the operation of the image forming apparatus.

Example 2 Preparation of Roller Propylene oxide and ethylene oxide were added at random to glycerin, the content of ethylene oxide units was 16% by weight, the number of functional groups was 3, the weight average molecular weight was 5,000, and the OH value was 5,000. Is 80 mg by weight of polyether polyol of 34 mgKOH / g, propylene oxide and ethylene oxide are randomly added to glycerin,
Acrylonitrile is graft-polymerized to a polyether polyol having 3 functional groups and a weight average molecular weight of 5,000,
20 parts by weight of a polymer polyol having a weight ratio of the polyether component to the acrylonitrile component of 80:20, and a mixture of diphenylmethane diisocyanate, urethane-modified diphenylmethane diisocyanate and carboxyimide-modified diphenylmethane diisocyanate, and an isocyanate content of 26.3 parts by weight 10.6 parts by weight of isocyanate, 4 parts by weight of a silicone foam stabilizer having an OH value of 32 mg KOH / g of a dimethylpolysiloxane-polyoxyalkylene copolymer, and 0.4 parts of an ethyl sulfate-modified aliphatic diethyl as an electrolyte.
Parts by weight, 0.04 parts by weight of dibutyltin dilaurate, and an OH value of 45 mg KO obtained by dispersing a black pigment in a polyol.
2.5 parts by weight of an H / g black colorant were mixed while being foamed by mechanical stirring, and a urethane foam roller was produced in the same manner as in Example 1. Roller physical properties and image evaluation When the roller physical properties were evaluated in the same manner as in Example 1, the bulk density of the foam portion was 0.45 g / ml, Asker C hardness was 42 °, electric resistance was ^107.95 Ω, and gray scale, Good images were obtained for both solid black and solid white. When the durability was evaluated in the same manner as in Example 1, paper jamming occurred more than ten times during printing, but a good image was obtained until printing of 50,000 sheets was completed.

Comparative Example 2 Preparation of Roller Propylene oxide and ethylene oxide were randomly added to glycerin, the number of functional groups was 3, and the weight average molecular weight was
Acrylonitrile is graft-polymerized to 5,000 polyether polyol, and 100 parts by weight of polymer polyol having a weight ratio of polyether component to acrylonitrile component of 80:20, diphenylmethane diisocyanate, urethane-modified diphenylmethane diisocyanate, and carboxyimide-modified 10.3 parts by weight of a mixture of diphenylmethane diisocyanate having an isocyanate content of 26.3% by weight, and a dimethylpolysiloxane-polyoxyalkylene copolymer having an OH value of 32 mgKOH /
g of silicone foam stabilizer, 4 parts by weight of an ethyl sulfate-modified aliphatic diethyl as electrolyte, 0.04 parts by weight of dibutyltin dilaurate, and a black pigment dispersed in a polyol having an OH value of 45 mg KOH / g. 2.5 parts by weight of the coloring agent were mixed while being foamed by mechanical stirring, and a urethane foam roller was produced in the same manner as in Example 1. Rollers properties, was evaluated roller properties in the same manner as image evaluation in Example 1, a bulk density of 0.48 g / ml of the form part, Asker C hardness 48 °, the electrical resistance is 10 ^8.15 Omega, black solid image In addition, image unevenness was observed. Since this roller has a high bulk density and a high roller hardness, it is presumed that it caused image defects.

[0027]

The image forming apparatus member of the present invention is suitable as an image forming apparatus member without contaminating the image carrier or the like even after being used for a long time, without fusing with a developer or the like. The image forming apparatus can be used in the form of an elastic roller such as a roller, a developing roller, a transfer roller, a toner supply roller, or a cleaning roller, or an elastic blade such as a toner layer regulating blade or a cleaning blade.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of an electrophotographic image forming apparatus in which a member of the image forming apparatus of the present invention is mounted as a transfer roller.

[Explanation of symbols]

 1: image carrier 2: developing roller 3: toner supply roller 4: toner layer regulating blade 5: transfer roller 6: cleaning roller 7: charging roller 8: recording medium (transfer material)

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G03G 15/08 501 G03G 15/08 501A 4J034 504 504A 504D 15/16 103 15/16 103 21/10 (C08G 18/63 Z // (C08G 18/63 101: 00) 101: 00) G03G 21/00 312 F term (reference) 2H003 AA12 BB11 CC05 2H032 AA05 BA19 BA23 2H034 BC03 BF03 2H077 AC04 AD06 AD13 AD14 AD23 FA22 GA03 3J103 AA02 BA41 FA07 FA09 FA12 FA14 GA02 GA52 GA64 GA73 GA74 HA03 HA12 HA18 HA48 4J034 DA01 DB04 DB05 GA62 HA01 HA07 HC12 HC61 HC64 HC67 HC71 NA01 QA03 QC01 RA19

Claims (7)

[Claims] 1. An image forming apparatus member comprising a polyurethane mainly obtained by reacting and curing an isocyanate component and a polyol component, wherein the polyol component is selected from the group consisting of acrylonitrile, styrene and an ethylenically unsaturated compound. A polymer polyol obtained by graft-polymerizing one or more compounds to a polyol,
An image forming apparatus member comprising from 5 to 95% by weight of all polyol components. 2. A polyol for graft-polymerizing one or more compounds selected from the group consisting of acrylonitrile, styrene and an ethylenically unsaturated compound, is a polyether polyol or polytetramethylene obtained by addition-polymerizing ethylene oxide and propylene oxide. 2. The image forming apparatus member according to claim 1, wherein the member is ether glycol. 3. The composition according to claim 1, wherein the molar ratio of the isocyanate component to the polyol component is from 0.9 to 1.5.
The image forming apparatus member according to any one of the preceding claims. 4. The image forming apparatus member according to claim 1, wherein the polyol component has two or three functional groups. 5. The polyurethane according to claim 1, wherein the polyurethane is a foam.
The image forming apparatus member according to any one of claims 1 to 4, wherein 6. The image forming apparatus member according to claim 1, wherein the image forming apparatus member is a transfer member, a charging member, a developing member, a developer supply member, or a cleaning member. 7. An image forming apparatus comprising the image forming apparatus member according to claim 6.