JP2001280344A - Sliding bearing and sliding bearing device for copying machine and printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding bearing device having excellent dimensional stability after the humidity absorption and water absorption, and superior abra sion resistance and slidability. SOLUTION: This sliding bearing is formed by a molding of a polyamide resin composition prepared by blending (A) 65-75 wt.% of polyamide resin including 47-63 mol% of constituent unit represented by a formula (I) and 53-37 mol% of a constituent unit represented by the formula -NHCO-C4H8-CONH-C6H12-, and having a limiting viscosity measured in 30 deg.C concentrated sulfuric acid, of 1.15-1.40 dl/g, and (B) 35-25 wt.% of a denatured polyolefin resin prepared by denaturing a polyolefin resin having the limiting viscosity measured in 135 deg.C decalin of 6-40 dl/g, and a polyolefin resin having the limiting viscosity of 0.1-5 dl/g, with 0.01-0.5 wt.% to the total denatured polyolefin resin, of unsaturated carboxylic acid or its derivative.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide bearing and a slide bearing device used for printers such as copiers, laser beam printers, and ink jet printers, and more particularly, to a sliding portion such as a gear that requires wear resistance. The present invention relates to a slide bearing and a slide bearing device for a copier or a printer that can be adopted.

[0002]

2. Description of the Related Art Printers such as copiers, laser beam printers, and ink jet printers are required to be small, lightweight, easy to use, and low in cost. In a toner image forming apparatus including an electrostatic latent image forming unit, a developer supplying unit, a developing unit and a transfer unit such as a copying machine and a laser beam printer, the built-in developing unit is, for example, easy to use and small and lightweight. The use of detachable process cartridges is progressing. As a bearing device at a sliding portion of such a copying machine or a printer, an oil-impregnated sintered plain bearing device, a resin plain bearing device, and the like are frequently used in place of the rolling bearing device.
Above all, a resin sliding bearing device in which a change in sliding characteristics is small even when a temperature change occurs as compared with an oil-impregnated sintered sliding bearing device is frequently used. 2. Description of the Related Art As a conventional resin plain bearing device, a plain bearing device using a sliding member formed of a molded product of a resin composition containing a polyamide resin, a polyolefin resin, and oil is known (Japanese Patent Application Laid-Open No. 11-114896). .

[0003]

However, a plain bearing using a resin composition containing the above-mentioned polyamide resin, polyolefin resin and oil has strict product control during production and maintains dimensional stability due to moisture absorption and water absorption. There was a problem that it was difficult. In particular, copiers, laser beam printers, inkjet printers, etc., whose production volume and applications are expanding, are designed to form good images under various atmospheres with different use conditions, so that there is no wear unevenness such as rotation There is a demand for a plain bearing having excellent sliding properties. In addition, there is a need for a slide bearing and a slide bearing device for a copying machine or a printer which can be suitably used particularly for a sliding portion requiring wear resistance such as a gear. The present invention has been made in order to address such problems, and has excellent dimensional stability after moisture absorption and water absorption, and has excellent wear resistance and slidability in a sliding bearing and a sliding bearing device for a copying machine or a printer. It is intended to provide.

[0004]

The present invention relates to a plain bearing for a copying machine or a printer formed by molding a polyamide resin composition, wherein the polyamide resin composition comprises:
(A) 47 to 63 mol% of a structural unit represented by the following (I)
And 53 to 37 mol% of a structural unit represented by the following (II), and has an intrinsic viscosity of 1.15 to 1.
65-75% by weight of polyamide resin which is 40dl / g,
(B) The intrinsic viscosities measured in decalin at 135 ° C are respectively
Modified polyolefin obtained by modifying a polyolefin resin consisting of a polyolefin resin of 6 to 40 dl / g and a polyolefin resin of 0.1 to 5 dl / g with 0.01 to 5% by weight of an unsaturated carboxylic acid or a derivative thereof based on the whole modified polyolefin resin It is characterized by containing 35 to 25% by weight of resin.

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[0005] The above polyamide resin composition is prepared by blending a polyamide resin in which the content ratio of an aromatic component and an aliphatic component is adjusted and a modified polyolefin resin mixture having a different intrinsic viscosity to form an amide bond and a modified polyolefin resin. A polymer alloy can be easily formed by involving the carboxyl group contained therein. In addition, the polyamide resin and the modified polyolefin resin each have a compounding ratio that can balance moisture absorption / water absorption, slidability, and moldability even when the respective resins are used alone. Therefore, since the resin composition is excellent in moisture absorption / water absorption, slidability and moldability, it is suitable for a slide bearing for a copying machine or a printer.

A sliding bearing device for a copying machine or a printer according to the present invention comprises a sliding portion and a housing for holding the sliding portion, and the sliding portion is formed by molding the polyamide resin composition. It is a bearing. Further, the copying machine or the printer is characterized by including at least an electrostatic latent image forming unit, a developer supplying unit, a developing unit, and a transferring unit. Further, the slide bearing device is a slide bearing device for a process cartridge.

The polyamide resin composition according to the present invention is excellent in moisture absorption / water absorption, slidability and moldability, and is also excellent in heat deformation resistance, impact resistance and the like inherently possessed by the polyamide resin. Mechanical and chemical-physical properties. For this reason, the present invention can be suitably applied to a sliding bearing portion of a sliding bearing device for a copying machine or a printer such as a sliding bearing device for a process cartridge. In addition,
The sliding bearing of the present invention is a concept including a gear having a sliding bearing portion and a rotation transmitting portion.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The polyamide resin constituting the polyamide resin composition according to the present invention will be described. The polyamide resin has a structural unit represented by the following (I) of 47 to 63.
Mol%, preferably 50-60 mol%, more preferably
52 to 58 mol% of a structural unit represented by the following (II):
The resin contains 3-37 mol%, preferably 50-40 mol%, more preferably 48-42 mol%, and has an intrinsic viscosity (η) of 1.15-1.40 dl / g measured in concentrated sulfuric acid at 30 ° C.

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When the structural unit represented by (I) is in the range of 47 to 63 mol% and the remaining structural unit is (II), the dimensional change due to moisture absorption and water absorption is reduced and the abrasion resistance is excellent. A sliding bearing can be manufactured. The structural unit (I)
If the content exceeds 63 mol%, when a slide bearing is manufactured, the rigidity may be too high and the wear resistance may decrease. The content of the structural unit (I) is 47 mol%.
If it is less than the above, the water absorption may increase, and the dimensional change due to water absorption may increase. In the present invention, the polyamide of the structural unit (I) and the polyamide of the structural unit (II) may be in a block form or a random form as long as the ratio is as described above.

The polyamide resin that can be used in the present invention is:
Intrinsic viscosity (η) measured in concentrated sulfuric acid at 0 ° C is 1.15 to 1.40dl
/ g, preferably 1.20 to 1.40 dl / g, more preferably 1.
It is in the range of 30-1.40dl / g. When the intrinsic viscosity (η) is within this range, the moldability of the polyamide resin composition will be good. A molded article produced from a polyamide resin composition containing such a polyamide resin also has excellent abrasion resistance during sliding. If the intrinsic viscosity (η) of the polyamide resin exceeds 1.40 dl / g, the resin viscosity may increase and the moldability may deteriorate. If the intrinsic viscosity (η) is less than 1.15 dl / g, the sliding of the molded article during sliding may occur. Wear resistance may decrease.
The polyamide resin having the intrinsic viscosity (η) is usually
It has a melting point of 280-330 ° C, often 290-3
It has a melting point in the range of 20 ° C. Further, this polyamide resin has excellent heat resistance and low water absorption.

The polyamide resin usable in the present invention includes a polycondensation reaction between a dicarboxylic acid component and a diamine component, a polycondensation reaction between a dicarboxylic acid component and a diisocyanate component, and an interfacial polycondensation between an acidification component of a dicarboxylic acid and a diamine component. It can be produced by a reaction or the like. Polymerization via a nylon salt facilitates equimolarization of an acid component and an amine component and achieves a high molecular weight, so that a polycondensation reaction between a dicarboxylic acid component and a diamine component is preferred. Specifically, an acid component composed of terephthalic acid and adipic acid and an amine component composed of 1,6-diaminohexane are blended in an aqueous medium in substantially equimolar amounts, and a catalyst such as sodium hypophosphite is mixed. It can be produced by first heating a polyamide precursor in the presence of a pressure to produce a polyamide precursor, and then melt-polymerizing the polyamide precursor. When producing the polyamide precursor, a monofunctional compound such as benzoic acid can be blended as a molecular weight regulator. Further, an aromatic polyamide resin having only the structural unit (I) and an aliphatic polyamide resin having only the structural unit (II) are separately manufactured, and these structural units (I) and (II) are mixed and kneaded. It can also be manufactured.

The modified polyolefin resin constituting the polyamide resin composition according to the present invention will be described. First,
Two types of polyolefin resins having different intrinsic viscosities will be described. Intrinsic viscosity measured in 135 ° C decalin is 6-4
The 0 dl / g polyolefin resin (hereinafter, referred to as an ultrahigh molecular weight polyolefin resin) is composed of a homopolymer of α-olefin or a copolymer of α-olefin of different types. Examples of the α-olefin include ethylene, propylene, 1-butene, isobutene, 1-pentene, 2-
Methyl-1-butene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, 4-methyl-1-
Pentene, 1-heptene, 1-octene, 1-decene,
1-dodecene, 1-tetradecene, 1-hexadecene,
Examples thereof include 1-octadecene and 1-icosene. In the present invention, an ethylene homopolymer or a copolymer containing ethylene as a main component and another α-olefin is preferable. The intrinsic viscosity (η) measured in decalin at 135 ° C. as an index of the molecular weight is 6 to 40 dl / g, preferably 10 to 40 dl / g.
g, more preferably 25 to 35 dl / g. Also, the density of this ultra-high molecular weight polyolefin resin (ASTM D15
05) is preferably 0.920 to 0.935 g / cm ³ .

The intrinsic viscosity measured at 135 ° C. in decalin is 0.
The polyolefin resin of 1 to 5 dl / g (hereinafter, referred to as a high molecular weight polyolefin resin) is composed of a homopolymer of α-olefin or a copolymer of different types of α-olefin, and is a monomer of an ultrahigh molecular weight polyolefin resin. The above-mentioned α-olefins can be used. In the present invention, an ethylene homopolymer or a copolymer containing ethylene as a main component and another α-olefin is preferable.
The intrinsic viscosity (η) measured in decalin at 135 ° C is 0.1-5d
l / g, preferably 0.1 to 2 dl / g. In addition, any resin having an intrinsic viscosity lower than that of the ultrahigh molecular weight polyolefin resin can be used without particular limitation. The difference in intrinsic viscosity between the ultrahigh molecular weight polyolefin resin and the high molecular weight polyolefin resin is 23 to 39 dl / g, preferably 23 to 37 dl / g.
In addition, the density of high molecular weight polyolefin resin (ASTM
(Measured according to D1505) is preferably 0.935 g / cm ³ or more.

The content of the ultrahigh molecular weight polyolefin resin in the polyolefin resin is based on the total amount of the ultrahigh molecular weight polyolefin resin and the high molecular weight polyolefin resin.
It is in the range of 5 to 45% by weight, preferably 10 to 30% by weight, more preferably 10 to 25% by weight. The limiting viscosity of the polyolefin resin composed of the ultrahigh molecular weight polyolefin resin and the high molecular weight polyolefin resin is in the range of 0.5 to 15 dl / g, preferably 3 to 10 dl / g, more preferably 4 to 6 dl / g.

The above-mentioned method for producing a polyolefin resin is obtained by mixing an ultrahigh molecular weight polyolefin resin and a high molecular weight polyolefin resin at a specific ratio by a known method. In addition, at the time of polymerization of the α-olefin, a polyolefin resin containing an ultrahigh molecular weight polyolefin and a high molecular weight polyolefin in a specific ratio can be obtained by multi-stage polymerization using a specific Ziegler-type catalyst.

The multi-stage polymerization method will be described. In this polymerization method, α-olefin is polymerized in multiple stages in the presence of a Ziegler-type catalyst formed from a highly active solid titanium catalyst component containing magnesium, titanium and halogen as essential components and an organoaluminum compound catalyst component. is there. For example, first, in one polymerization step, α-
The olefin is polymerized to produce the ultra-high molecular weight polyolefin, and in the other polymerization steps, the α-olefin is polymerized in the presence of hydrogen to produce a high molecular weight polyolefin, whereby the ultra high molecular weight polyolefin and the high molecular weight polyolefin are produced. A polyolefin resin containing polyolefin in a specific ratio is obtained.

The Ziegler-type catalyst used in the multi-stage polymerization is a catalyst having a specific property composed of a solid titanium catalyst component and an organoaluminum compound catalyst component. As the solid titanium catalyst component, for example,
It is preferable to use a highly active fine powdery catalyst component having a narrow particle size distribution and a form in which several microspheres having an average particle size of about 0.01 to 5 μm are fixed. A highly active fine powdered titanium catalyst component having such properties is disclosed in, for example, JP-A-56-81.
In the solid titanium catalyst component described in JP-A No.
When a magnesium compound in a liquid state is brought into contact with a titanium compound in a liquid state to precipitate a solid product, it can be produced by strictly adjusting the precipitation conditions. For example, in the above method, when a hydrocarbon solution in which magnesium chloride and a higher alcohol are dissolved and titanium tetrachloride are mixed at a low temperature, and then heated to about 50 to 100 ° C. to precipitate a solid product, A small amount of about 0.01 to 0.2 mol of monocarboxylic acid ester coexists with 1 mol of magnesium chloride, and precipitation is performed under strong stirring conditions. If necessary, it may be washed with titanium tetrachloride.
In this way, a solid catalyst component satisfying both the activity and the particle state can be obtained. This catalyst component contains, for example, about 1 to 6% by weight of titanium, a halogen / titanium (atomic ratio) of about 5 to 90, and a magnesium / titanium (atomic ratio) of about 4 to 50.

By subjecting the slurry of the solid titanium catalyst component obtained as described above to a shearing treatment at a high speed, the particle size distribution is narrow and the average particle size is usually 0.01 to 5 μm.
Those composed of microspheres, preferably in the range of 0.05 to 3 μm, can also be suitably used as the highly active fine powder titanium catalyst component. As a high-speed shearing method, for example, a method of treating a slurry of a solid titanium catalyst component in an inert gas atmosphere using a commercially available homomixer for an appropriate time can be adopted. At that time, in order to prevent a decrease in catalytic performance, a method in which an organoaluminum compound in an equimolar amount with titanium is added in advance may be adopted. By these methods, a highly active fine powdered titanium catalyst component having the above fine particle diameter can be obtained.

Using this highly active fine powdery titanium catalyst component and an organoaluminum compound catalyst component, if necessary, in combination with an electron donor, pentane, hexane, heptane,
In a hydrocarbon solvent such as kerosene, usually, in a temperature range of 0 to 100 ° C., for example, α-olefin alone or a monomer mixture containing α-olefin as a main component in at least two or more multistage polymerization steps. By performing the slurry polymerization, a polyolefin resin containing an ultrahigh molecular weight polyolefin and a high molecular weight polyolefin can be produced.

Specific examples of the organoaluminum compound catalyst component used include trialkylaluminums such as triethylaluminum and triisobutylaluminum; dialuminum chlorides such as diethylaluminum chloride and diisobutylaluminum chloride;
Examples thereof include alkylaluminum sesquichlorides such as ethylaluminum sesquichloride, which are used alone or in combination of two or more.

In this multi-stage polymerization step, a multi-stage polymerization apparatus in which at least two or more polymerization tanks are usually connected in series is employed, for example, a two-stage polymerization method, a three-stage polymerization method, and an n-stage polymerization method. The law is enforced. Further, it is also possible to carry out a multi-stage polymerization method by a batch polymerization method in one polymerization tank. It is necessary to produce a specific amount of ultrahigh molecular weight polyolefin in at least one polymerization tank in this multi-stage polymerization step. The polymerization step for producing the ultrahigh molecular weight polyolefin may be a first-stage polymerization step or an intermediate polymerization step,
Further, two or more stages may be provided. It is preferable to generate an ultrahigh molecular weight polyolefin in the first polymerization step from the viewpoint of the polymerization treatment operation and the control of the physical properties of the produced polyolefin. In this polymerization step, an ultrahigh molecular weight polyolefin having a predetermined intrinsic viscosity (η) is produced by polymerizing 15 to 40% by weight of the olefin polymerized in all steps. Further, it is preferable to form an ultrahigh molecular weight polyolefin having a predetermined intrinsic viscosity by polymerizing 18 to 37% by weight, particularly 21 to 35% by weight of the monomers to be polymerized in the whole polymerization step.

In this multi-stage polymerization step, in the polymerization step for producing an ultrahigh molecular weight polyolefin, the polymerization is carried out in the presence of a specific Ziegler-type catalyst comprising the highly active titanium catalyst component and the organic aluminum catalyst component. This polymerization can be carried out by a gas phase polymerization method or a liquid phase polymerization method. In any polymerization method, in the polymerization step for producing an ultra-high molecular weight polyolefin, the polymerization reaction is carried out in the presence of an inert medium, if necessary. For example, the gas phase polymerization method is carried out in the presence of a diluent composed of an inert medium as necessary, and the liquid phase polymerization method is carried out in the presence of a solvent composed of an inert medium as necessary.

In the polymerization step for producing the ultra-high molecular weight polyolefin, titanium is contained in an amount of about 0.001 to 20 milligram atoms per liter of medium, particularly about 0.005 to 10 milligram atoms, and the organoaluminum compound catalyst component is contained in Al / It is preferable to use a highly active titanium catalyst component containing Ti (atomic ratio) in a ratio of about 0.1 to 1000, particularly about 1 to 500. The polymerization temperature in the polymerization step for producing the ultrahigh molecular weight polyolefin is usually in the range of about -20 to 120C, preferably about 100 to 100C, and particularly preferably about 5 to 95C. Further, the pressure of the polymerization reaction may be within a pressure range in which liquid-phase polymerization or gas-phase polymerization can be performed at the above-mentioned polymerization temperature, for example, from atmospheric pressure to about 100 kg / c
m ² , preferably in the range from atmospheric pressure to about 50 kg / cm ² .

The polymerization time may be set so that the total amount of the polymerized polyolefin is about 1000 g or more, preferably about 2000 g or more per 1 mg atom of titanium in the highly active titanium catalyst component. Further, in the polymerization step, in order to produce the ultrahigh molecular weight polyolefin, the polymerization reaction is preferably performed in the absence of hydrogen. Further, after the polymerization reaction is performed, the polymer can be once isolated and stored in an inert medium atmosphere.

As the inert medium used in the polymerization step for producing the ultrahigh molecular weight polyolefin, specifically, aliphatic hydrocarbons such as propane, butane, pentane, hexane, heptane, octane, decane, and kerosene; cyclopentane And alicyclic hydrocarbons such as cyclohexane; aromatic hydrocarbons such as benzene, toluene and xylene; halogenated hydrocarbons such as dichloroethane, methylene chloride and chlorobenzene, and the like, alone or in combination of two or more. Used. Particularly, an aliphatic hydrocarbon is preferred.

In the above method, in other polymerization steps other than the polymerization step for producing an ultrahigh molecular weight polyolefin, the remaining monomers are subjected to a polymerization reaction in the presence of hydrogen to produce a high molecular weight polyolefin. If the polymerization step for producing the ultrahigh molecular weight polyolefin is the first polymerization step, the second and subsequent polymerization steps are the high molecular weight polyolefin production steps performed in the presence of hydrogen. If the step of polymerizing the high molecular weight polyolefin is located after the step of forming the ultrahigh molecular weight polyolefin, the reaction mixture containing the ultrahigh molecular weight polyolefin is supplied to the step of polymerizing the high molecular weight polyolefin. Also, when the polymerization step of the high-molecular-weight polyolefin is located before the polymerization step in which the ultra-high-molecular-weight polyolefin is produced,
The high molecular weight polyolefin and the ultra high molecular weight polyolefin produced in the previous stage are supplied, and in each case, the polymerization is continuously performed. At that time, usually, a raw material monomer mixture and hydrogen are supplied to the polymerization step. When the polymerization step is a first-stage polymerization step, a catalyst comprising the highly active titanium catalyst component and the organoaluminum compound catalyst component is supplied, and when the polymerization step is a polymerization step of the second and subsequent steps, Can use the catalyst contained in the polymerization reaction mixture produced in the previous step as it is, or if necessary, additionally replenish the above-mentioned highly active titanium catalyst component and / or organoaluminum compound catalyst component. Good. The supply ratio of hydrogen in the polymerization step other than the polymerization step for producing the ultrahigh molecular weight polyolefin is usually based on 1 mol of the monomer supplied to the polymerization step.
It is in the range of 0.01 to 50 mol, preferably 0.05 to 30 mol.

The concentration of each catalyst component in the polymerization reaction mixture in the polymerization tank in a polymerization step other than the polymerization step for producing the ultrahigh molecular weight polyolefin was calculated by converting the above-treated catalyst to titanium atoms per liter of polymerization volume. About 0.0
01 to 0.1 milligram atoms, preferably about 0.005 to 0.1 milligram atoms, and the Al / Ti (atomic ratio) of the polymerization system is about 1
It is preferably adjusted to be about 1000, preferably about 1 to 500. If necessary, an organoaluminum compound catalyst component may be additionally used. In the polymerization system, hydrogen, an electron donor, a halogenated hydrocarbon, and the like may be coexistent in order to adjust the molecular weight, the molecular weight distribution, and the like.

The polymerization temperature is within a temperature range in which slurry polymerization and gas phase polymerization are possible, and is about 40 ° C. or higher, more preferably about 40 ° C.
It is in the range of 50-100 ° C. The polymerization pressure is, for example, from atmospheric pressure to about 100 kg / cm ² , particularly from atmospheric pressure to about 50 kg / cm ^2.
Range is recommended. The polymerization time is preferably set so that the amount of the polymer produced is about 1000 g or more, and particularly preferably about 5000 g or more, per 1 mg atom of titanium in the titanium catalyst component.

The polymerization steps other than the polymerization step for producing the ultrahigh molecular weight polyolefin can be similarly performed by a gas phase polymerization method or a liquid phase polymerization method. Of course, different polymerization methods may be employed in each polymerization step. Among the liquid phase polymerization methods, a slurry suspension polymerization method is suitably employed. In each case, the polymerization reaction is usually carried out in the presence of an inert medium. For example, the gas phase polymerization method is carried out in the presence of an inert medium diluent, and the liquid phase slurry suspension polymerization method is carried out in the presence of an inert medium solvent. As the inert medium, the same inert medium as that exemplified in the polymerization step for producing the ultrahigh molecular weight polyolefin can be exemplified. Further, the multi-stage polymerization can be performed in any of a batch system, a semi-continuous system, and a continuous system.

In the modified polyolefin resin used in the present invention, the above polyolefin resin is graft-modified with an unsaturated carboxylic acid or a derivative thereof. As the unsaturated carboxylic acid used for the graft modification, specifically, acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, crotonic acid, endocis-bicyclo (2,2,1) hept- 5-ene-2, 3-dicarboxylic acid (Nadic acid TM) and the like. Examples of the derivatives include acid halides, esters, amides, imides, and anhydrides. Specific examples thereof include maleenyl chloride, maleimide, acrylamide, methacrylamide, glycidyl methacrylate, maleic anhydride, and citraconic anhydride. Acid, monomethyl maleate, dimethyl maleate, glycidyl maleate and the like. These modifiers may be used alone or in combination of two or more. Among these, maleic anhydride is preferred because it is possible to obtain a molded article having high reactivity and good strength and appearance.

The amount of the grafting of the modifying agent on the modified polyolefin resin is determined by the modified polyolefin resin composed of the ultrahigh molecular weight polyolefin and the high molecular weight polyolefin.
0.01 to 5% by weight with respect to% by weight, and further 0.2%
2.02.0% by weight, preferably 0.7-1.3% by weight
It is preferred that

As the method for producing the modified polyolefin resin, various conventionally known methods can be employed. For example, a polyolefin resin containing an ultra-high-molecular-weight polyolefin and a high-molecular-weight polyolefin is suspended or dissolved in a solvent, and usually, at a temperature of 80 to 200 ° C., a modifier and a radical polymerization initiator are added, mixed and grafted. Copolymerization method, or above the melting point, for example, 180-300
A method in which a modifier and a radical polymerization initiator are brought into contact with each other at a temperature of ° C under melt-kneading. Alternatively, both the ultra-high molecular weight polyolefin and the high molecular weight polyolefin may be modified with a modifying agent in advance and then mixed.

Specific examples of the solvent used include aromatic hydrocarbon solvents such as toluene and xylene; aliphatic hydrocarbon solvents such as hexane, heptane, octane and decane; alicyclic solvents such as cyclohexane and methylcyclohexane. Aliphatic hydrocarbon solvents such as trichloroethylene, perchloroethylene, dichloroethylene, dichloroethane and chlorobenzene; aliphatic alcohol solvents such as ethanol and isopropanol; ketone solvents such as acetone, methyl isobutyl ketone and methyl ethyl ketone; Examples include ester solvents such as methyl acetate, ethyl acetate, and butyl acetate. These solvents may be used alone or in combination of two or more.

Further, examples of the radical polymerization initiator include organic peroxides and azo compounds. As the organic peroxide, specifically, benzoyl peroxide, 2,
4-dichlorobenzoyl peroxide, m-trioyl peroxide, di-t-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexane, 2,5 -Dimethyl-2,5-bis (t-butylperoxy) hexyne-
3, lauroyl peroxide, t-butylperoxyacetate, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, t-butylperoxybenzoate, t-butylperoxyisobutyrate, t-butyl Examples include peroxyphenyl acetate, t-butyl peroxy-s-octate, t-butyl peroxybivalate, cumyl peroxyvivalate, t-butyl peroxyethyl acetate, and the like. Specific examples of the azo compound include azoisobutyronitrile and dimethylazoisobutyrate. These radical polymerization initiators are used alone or in combination of two or more.

The polyamide resin composition according to the present invention comprises the polyamide resin in an amount of 65 to 75% by weight, preferably 67 to 73% by weight, more preferably 69 to 75% by weight, based on the whole resin composition.
To 71% by weight, 35 to 25% by weight of the modified polyolefin resin, preferably 33 to 27% by weight, more preferably 31% by weight.
Contains up to 29% by weight. In the resin composition according to the present invention, PPS (polyphenylene sulfide), PPE (polyphenyl ether), PES (polyether sulfone), PEI (poly) are contained in the polyamide composition within a range that does not impair the object of the present invention. A heat-resistant resin composed of ether imide), LCP (liquid crystal polymer) and modified products of these resins can also be blended. Further, the polyamide resin composition of the present invention contains an antioxidant such as a phosphorus antioxidant, a phenolic antioxidant, an amine antioxidant, and a sulfur antioxidant (heat stabilizer).
Can be blended.

Examples of phosphorus antioxidants include 9,10
-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, triphenylphosphite, 2-
Ethylhexyl phosphate, dilauryl phosphite, tri-iso-octyl phosphite, tris (2,4-di-tert-butylphenyl) phosphite, trilauryl phosphite, trilauryl-di-thiophosphite, trilauryl-tri- Thiophosphite, trisnonylphenyl phosphite, distearylpentaerythritol diphosphite, tris (monononylphenyl) phosphite, tris (dinonylphenyl) phosphite, trioctadecylphosphite,
1,1,3-tris (2-methyl-di-tridecylphosphite-5-tert-butylphenyl) butane,
4,4'-butylidene-bis (3-methyl-6-ter
t-butyl) tridecyl phosphite, 4,4'-butylidene-bis (3-methyl-6-tert-butyl-di-tridecyl) phosphite, bis (2,4-di-te
rt-butylphenyl) pentaerythritol-di-phosphite, bis (2,6-di-tert-butyl-4)
-Methylphenyl) pentaerythritol di-phosphite, tetrakis (2,4-di-tert-butylphenyl) 4,4'-bisphenylenediphosphite, distearylpentaerythritol diphosphite, tridecyl phosphite, tridecyl Stearyl phosphite,
2,2'-methylenebis (4,6-di-tert-butylphenyl) octyl phosphite, sorbitol-tris-phosphite-distearyl-mono- _C30 -diol ester and bis (2,4,6-tri- tert-
(Butylphenyl) pentaerythritol-di-phosphite. Among them, screw (2,
4-di-tert-butylphenyl) pentaerythritol-di-phosphite and bis (2,6-di-te
penta-erythritol such as rt-butyl-4-methylphenyl) pentaerythritol-di-phosphite
Di-phosphite-based phosphorus antioxidant and tetrakis (2,4-di-tert-butylphenyl)
4,4'-bisphenylenediphosphonite is exemplified.

Examples of phenolic antioxidants include:
3,9 bis {2- [3- (3-tert-butyl-4-
[Hydroxy-5-methylphenyl) propionyl]-
1,1-dimethylethyl {-2,4,8,10-tetraoxaspiro [5,5] undecane, 2,6-di-te
rt-butyl-p-cresol, 2,4,6-tri-t
tert-butylphenol, n-octadecyl-3-
(4'-hydroxy-3 ', 5'-di-tert-butylphenol) propionate, styrenated phenol, 4-hydroxy-methyl-2,6-di-tert-
Butylphenol, 2,5-di-tert-butyl-hydroquinone, cyclohexylphenol, butylhydroxyanisole, 2,2'-methylene-bis- (4-
Ethyl-6-tert-butylphenol), 4,4 '
-Iso-propylidene bisphenol, 4,4'-butylidene-bis (3-methyl-6-tert-butylphenol), 1,1-bis- (4-hydroxy-phenyl) cyclohexane, 4,4'-methylene-bis −
(2,6-di-tert-butylphenol), 2,6
-Bis (2-hydroxy-3'-tert-butyl-
5'-methylmethylbenzyl) 4-methyl-phenol, 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butyl-phenyl) butane, 1,
3,5-tris-methyl-2,4,6-tris (3,5
-Di-tert-butyl-4-hydroxy-benzyl) benzene, tetrakis [methylene-3- (3,5-
Di-tert-butyl-4-hydroxyphenyl) propionate] methane, tris (3,5-di-tert)
-Butyl-4-hydroxyphenyl) isocyanurate, tris [β- (3,5-di-tert-butyl-4)
-Hydroxyphenyl) propionyl-oxyethyl) isocyanate, 4,4′-thiobis (3-methyl-6-tert-butylphenol), 2,2′-thiobis (4-methyl-6-tert-butylphenol), 4,4 '-Thiobis (2-methyl-6-tert
-Butylphenol) and N, N'-hexamethylenebis (3,5-di-tert-butylphenol-4)
-Hydroxycinnamamide).

Examples of amine antioxidants include 4,4
'-Bis (α, α-dimethylbenzyl) diphenylamine, phenyl-α-naphthylamine, phenyl-β-naphthylamine; N-diphenyl-p-phenylenediamine, N, N′-di-β-naphthyl-p-phenylenediamine, N-cyclohexyl-N′-phenyl-p-
Polymers of phenylenediamine, N-phenyl-N'-isopropyl-p-phenylenediamine, aldol-α-naphthylamine, 2,2,4-trimethyl-1,2-dihydroquinone and 6-ethoxy-2,2,4-
Trimethyl-1,2-dihydroquinoline.

Examples of sulfur-based antioxidants include thiobis (β-naphthol), thiobis (N-phenyl-
β-naphthylamine), 2-mercaptobenzothiazole, 2-mercaptobenzimidazole, dodecylmercaptan, tetramethylthiuram monosulfide, tetramethylthiuram disulfide, nickel dibutyl dithiocarbamate, nickel isopropyl xanthate, dilauryl thiodipropionate, and dilauryl thiodipropionate Stearyl thiodipropionate is mentioned.

The above antioxidants can be used alone or in combination. Among these antioxidants, it is particularly preferable to use a phosphorus-based antioxidant alone or in combination with another antioxidant.

The polyamide resin composition of the present invention may contain, as an inorganic reinforcing material, various inorganic fillers having a fibrous, powdery, granular, plate-like, needle-like, cloth-like, mat-like, or other shape. For example, preferable examples of the fibrous inorganic filler include glass fiber, carbon fiber, asbestos fiber, and boron fiber. Of these, glass fibers are particularly preferred. The use of glass fibers improves the mechanical properties such as tensile strength, bending strength and flexural modulus of the molded product and the heat resistance properties such as thermal deformation temperature. The average length of the above glass fibers is usually in the range of 0.1 to 20 mm, preferably 0.3 to 6 mm, and the aspect ratio is usually in the range of 10 to 2000, preferably 30 to 600. It is preferable to use glass fibers having an average length and an aspect ratio within such ranges. Such a glass fiber is used in an amount of usually 200 parts by weight or less, preferably 5 to 180 parts by weight, more preferably 5 to 150 parts by weight, based on 100 parts by weight of the resin component.

In addition to the above-mentioned fibrous inorganic fillers, examples of various fillers having a powdery, granular, plate-like, needle-like, cloth-like, mat-like shape, etc. usable in the present invention include silica. Powdery or plate-like inorganic compounds such as silica alumina, alumina, calcium carbonate, titanium dioxide, talc, wollastonite, diatomaceous earth, clay, kaolin, spherical glass, mica, gypsum, red iron oxide, magnesium oxide and zinc oxide, Needle-like inorganic compounds such as potassium titanate, titanium oxide, and aluminum borate are exemplified. When employed in gears, needle-like inorganic compounds are particularly preferred. These fillers can be used as a mixture of two or more kinds. Further, these fillers can be used after being treated with a silane coupling agent or a titanium coupling agent. The average particle size of such a filler is usually 0.1 to 200 μm, preferably 1 to 100
It is in the range of μm. Such a filler is a resin component 1
It is used in an amount of usually 200 parts by weight or less, preferably 100 parts by weight or less, particularly preferably 1 to 50 parts by weight, per 100 parts by weight.

Further, the polyamide resin composition of the present invention comprises:
Organic fillers, in addition to the above components, within a range that does not impair the resin properties as a plain bearing for copying machines or printers
Additives such as heat stabilizers, weathering stabilizers, antistatic agents, antislip agents, antiblocking agents, antifogging agents, lubricants, pigments, dyes, natural oils, synthetic oils and waxes can be added. Examples of organic fillers include polyparaphenylene terephthalamide, polymetaphenylene terephthalamide,
Wholly aromatic polyamides such as polyparaphenylene isophthalamide, polymetaphenylene isophthalamide, condensates of diaminodiphenyl ether with terephthalic acid (isophthalic acid) and condensates of para (meth) aminobenzoic acid; diaminodiphenyl ether and trimellitic anhydride Or a wholly aromatic polyamideimide or a wholly aromatic polyimide such as a condensate with pyromellitic anhydride; a wholly aromatic polyester; a heterocyclic-containing compound such as polybenzimidazole and polyimidazophenanthroline; and polytetrafluoroethylene. And secondary processed products such as powder, plate, fiber or cloth.

The polyamide resin composition according to the present invention comprises the above polyamide resin, the above modified polyolefin resin,
If necessary, it can be adjusted by melt-kneading the above additives. Although the melt-kneading temperature is not particularly limited, it is usually 200 to 300 ° C, preferably 200 to 270 ° C. For kneading, a known kneader such as a single-screw extruder, a twin-screw extruder, or a Banbury mixer can be used.

A plain bearing for a copying machine or a printer is
The polyamide resin composition is obtained by molding into a molded body using a usual melt molding method, for example, a compression molding method, an injection molding method, an extrusion molding method, or the like. For example, a plain bearing can be manufactured by introducing the polyamide resin composition of the present invention in a molten state into a mold of an injection molding machine having a cylinder temperature adjusted to about 300 to 350 ° C.

The sliding bearing device for a copying machine or a printer according to the present invention comprises a sliding portion and a housing for holding the sliding portion, and at least the sliding surface is formed of the above-mentioned polyamide resin composition. Further, the housing portion may be the above-described polyamide resin composition or a different material.

FIG. 1 shows an embodiment of the sliding bearing device of the present invention.
It will be described based on. FIG. 1 is a perspective view showing an embodiment of the sliding bearing device. In the sliding bearing device shown in FIG. 1, a cylindrical sliding portion 1 is formed of the above-mentioned polyamide resin composition, and this is fitted into a cylindrical housing 2 having a larger diameter than the sliding portion 1, and a shaft is provided inside the housing 2. The resin dovetail 3 is press-fitted into the dovetail groove formed in the direction, and integrated. The cylindrical housing 2 can be made of metal, resin, rubber or ceramic material. Since the sliding bearing 1 does not require mechanical strength in the sliding bearing device, a material having the best slidability can be selected, and a material having excellent mechanical properties and durability can be preferentially selected for the housing 1. . As described above, in the sliding bearing device, the sliding surface and other portions are formed of different materials, and the functions of each portion can be separately provided. Further, under the use condition where the mechanical strength is not strongly required, the sliding surface and the housing can be integrally formed of the same material.

If the load in the radial direction of the plain bearing device is a fixed direction or a partial load, C shown in FIG.
The sliding portion 4 having the U-shaped flange 4a can be formed from the above-described polyamide resin composition.

The thus configured sliding bearing device is:
It has excellent initial sliding characteristics and little deterioration of sliding characteristics over time.
It can be applied to rotary bearings of ink jet printers and the like.

Next, a copying machine or a printer will be described with reference to FIG. FIG. 3 shows a developing device of the electrophotographic apparatus, which irradiates a light beam 6 from an exposure device such as a laser beam (not shown) onto the surface of a roll-shaped electrostatic latent image holding member 5 which is driven to rotate to form an electrostatic latent image. A developing roller 8 for forming and applying a powdery developer 7 such as toner is arranged in contact with the surface of the electrostatic latent image holding member 5, and the developer 7 attached to the surface of the A transfer unit for transferring the latent image holding member 5 to the sheet 9 while rotating the latent image holding member 5 is provided. Rotary shafts 11, 12, and 13 arranged at important points such as a roll-shaped electrostatic latent image holder 5, a developing roller 8, and a stirring blade 10 of the developing device are supported by a slide bearing device. The sliding surface of the device is formed of a polyamide resin composition. The developing device shown in FIG. 3 is an example of a developing device using a two-component developing method, and may employ a photosensitive belt instead of the roll-shaped electrostatic latent image holder 5 (photosensitive drum). In the figure, reference numeral 14 denotes a charger, 15 denotes a cleaning device, and 16 denotes a magnetic member.

[0051]

EXAMPLES Examples of the production of polyamide resins and modified polyolefin resins used in Examples and Comparative Examples will be described below. Production Example 1 Production of polyamide resin 1 26450 g (228 mol) of 1,6-diaminohexane, 20560 g (124 mol) of terephthalic acid, and 14800 g of adipic acid
(101 mol) and sodium hypophosphite 48g as catalyst
(0.45 mol), 172 g (1.4 g) of benzoic acid as a molecular weight regulator
1 mol) and 6.2 liters of ion-exchanged water into a 100 liter reactor, and after purging with nitrogen, 250 ° C, 35kg / cm ²
Reaction was performed for 1 hour under the following conditions. The molar ratio of terephthalic acid to adipic acid is 55:45. After one hour, the reaction product generated in the reactor is discharged to a receiver connected to the reactor and set at a pressure of about 10 kg / cm ² lower, and has an intrinsic viscosity (η) of 0.15 dl / g. Polyamide precursor 55
900g was obtained. Next, this polyamide precursor was dried and melt-polymerized at a cylinder set temperature of 340 ° C. using a twin-screw extruder to obtain a polyamide resin 1. The composition of this polyamide resin 1 is as follows. The content of the terephthalic acid component unit in the dicarboxylic acid component unit is 55 mol%,
The content of the adipic acid component unit was 45 mol%. Therefore, the structural unit represented by (I) is 55 mol%,
The constituent unit represented by (II) is 45 mol%. Also,
The intrinsic viscosity (η) measured in concentrated sulfuric acid at 30 ° C. was 1.35 dl / g, and the melting point was 312 ° C.

Production Example 2 Production of Polyamide Resin 2 25,400 g (219 mol) of 1,6-diaminohexane, 24700 g (149 mol) of terephthalic acid, and 10600 of isophthalic acid
g (64 mol) and sodium hypophosphite 45g as catalyst
(0.425 mol), 325 g of benzoic acid (2.
66 mol), and 14.8 liters of ion-exchanged water were charged into a 100 liter reactor, and after nitrogen replacement, 250 ° C, 35 kg / cm
^The reaction was performed under the conditions of ² for 1 hour. The molar ratio of terephthalic acid to isophthalic acid is 70:30. After one hour,
54500 g of a polyamide precursor having an intrinsic viscosity (η) of 0.10 dl / g was withdrawn from the reaction product produced in the reactor into a receiver connected to the reactor and set at a pressure of about 10 kg / cm ² lower. I got Next, the polyamide precursor was dried and melt-polymerized at a cylinder set temperature of 330 ° C. using a twin-screw extruder to obtain a polyamide resin 2. The composition of this polyamide resin 2 is as follows. The content of the terephthalic acid component unit in the dicarboxylic acid component unit was 70 mol%, and the content of the isophthalic acid component unit was 30 mol%. The intrinsic viscosity (η) measured in concentrated sulfuric acid at 30 ° C is
It was 1.10 dl / g and the melting point was 325 ° C.

Production Example 3 Production of polyamide resin 3 26450 g (228 mol) of 1,6-diaminohexane, 20630 g (124 mol) of terephthalic acid and 14850 g of adipic acid
(102 mol) and 48g of sodium hypophosphite as a catalyst
(0.45 mol), 342 g (2.8%) of benzoic acid as a molecular weight regulator
0 mol) and 6.2 liters of ion-exchanged water into a 100 liter reactor, and after purging with nitrogen, 250 ° C, 35kg / cm ²
Reaction was performed for 1 hour under the following conditions. The molar ratio of terephthalic acid to adipic acid is 55:45. After one hour, the reaction product generated in the reactor is discharged to a receiver connected to the reactor and set at a pressure of about 10 kg / cm ² lower, and has an intrinsic viscosity (η) of 0.15 dl / g. Polyamide precursor 55
900g was obtained. Next, this polyamide precursor was dried and melt-polymerized at a cylinder set temperature of 340 ° C. using a twin-screw extruder to obtain a polyamide resin 3. The composition of the polyamide resin 3 is as follows. The content of the terephthalic acid component unit in the dicarboxylic acid component unit is 55 mol%,
The content of the adipic acid component unit was 45 mol%. Therefore, the structural unit represented by (I) is 55 mol%,
The constituent unit represented by (II) is 45 mol%. Also,
The intrinsic viscosity (η) measured in concentrated sulfuric acid at 30 ° C. was 1.00 dl / g, and the melting point was 312 ° C.

Production Example 4 Production of Polyamide Resin 4 In the production of polyamide resin 3, the amount of terephthalic acid was 16880 g (102 mol) and the amount of adipic acid was
A polyamide resin 4 was obtained in the same manner as in the production of the polyamide resin 3, except that 18150 g (124 mol) and the compounding ratio (molar ratio) were set to 45:55.

Production Example 5 Production of Polyamide Resin 5 In the production of polyamide resin 3, the amount of terephthalic acid was 24380 g (147 mol) and the amount of adipic acid was
Polyamide resin 5 was obtained in the same manner as in the production of polyamide resin 3, except that 11550 g (79 mol) and the compounding ratio (molar ratio) were 65:35. Table 1 shows the compositions and physical properties of the polyamide resins 1 to 5 obtained in Production Examples 1 to 5. (II) in the component ratio (I) / (II) of the polyamide resin 2 shown by * is C
_{The 4} H ₈ moiety is an isophthalic acid residue.

[0056]

[Table 1]

Production Example 6 Production of Modified Polyethylene Resin 1 The intrinsic viscosity (η) measured in decalin at 135 ° C. was 31 dl / g.
20% by weight of polyeletin resin, also the intrinsic viscosity (η)
Of a 1 dl / g polyeletin resin, 100 parts by weight of a polyethylene resin, 0.8 parts by weight of maleic anhydride, and 0.07 parts by weight of an organic peroxide (Nippon Oil & Fats Co., Ltd. Perhexin-25B) were mixed with a Henschel mixer. The resulting mixture was subjected to melt graft modification with a single-screw extruder having a diameter of 65 mm set at 250 ° C. to obtain a modified polyeletin resin 1. The amount of maleic anhydride grafted on this modified polyethylene resin 1 was measured by IR analysis and was 0.8% by weight. The intrinsic viscosity (η) of the mixed polyethylene resin before modification was measured in decalin at 135 ° C.
Was 5 dl / g.

Production Example 7 Production of Modified Polyethylene Resin 2 The intrinsic viscosity (η) measured in decalin at 135 ° C. was 3.7 dl / g.
100 parts by weight of high-density polyethylene (density: 0.95 g / cm ³ ), 0.8 parts by weight of maleic anhydride, and 0.07 parts by weight of an organic peroxide (Nippon Oil & Fats Co., Ltd., Perhexin-25B) were mixed using a Henschel mixer. 250
The modified polyeletin resin 2 was obtained by melt graft modification with a 65 mmφ single screw extruder set to ° C. The amount of maleic anhydride grafted on this modified polyethylene resin 2 was measured by IR analysis, and was 0.8% by weight.

Example 1 70 parts by weight of the polyamide resin 1 obtained in Production Example 1 and 30 parts by weight of the modified polyeletin resin 1 obtained in Production Example 6 were mixed, and then a 30 mmφ vent-type twin screw extrusion was performed. The mixture was melted and mixed at a cylinder temperature of 300 to 335 ° C. to produce pellets of the polyamide resin composition. An injection molded test piece was prepared using the pellets thus obtained, and the dimensional stability after water absorption, abrasion resistance, the kinetic friction coefficient and the amount of wear assuming the actual machine were measured by the following method, and as a sliding bearing. The performance was evaluated. Table 2 shows the evaluation results.

Dimensional Stability after Water Absorption A square plate having a thickness of 2 mm was prepared using a mold whose original dimensions were measured, and the square plate was placed in a water bath at 23 ° C., and the dimensional change after absorbing water for 96 hours was measured. The measurement was made, and the case where the dimensional change rate was less than 0.5% was evaluated as ○, the case where it was 0.5% or more and less than 1.0% was evaluated as Δ, and the case where 1.0% or more was evaluated as ×.

Coefficient of friction and wear assuming the actual machine A ring-shaped test piece having an inner diameter of 9.2 mmφ, an outer diameter of 12.2 mmφ and a width of 5.4 mm was formed. Using this radial test piece, a radial tester was used to test the surface pressure of 0.49 MPa, the speed of 13.62 m / min, and the sliding partner material as an aluminum alloy containing magnesium (Mg) (A505).
6) A friction and wear test was performed at 30 ° C. For the evaluation, the friction coefficient 50 hours after the start of the test and the wear amount were measured. The amount of wear was determined by measuring the thickness of the sliding portion before and after the test, and the difference was defined as the amount of wear.

Comparative Examples 1 to 7 Polyamide resins 1 to 5 and commercially available polyamide resins (nylon 6 resin, Alamine CM100 manufactured by Toray Industries, Inc.)
7) The modified polyeletin resin 1 and the modified polyeletin resin 2 were melt-mixed at the compositions and ratios shown in Table 2 to produce pellets of the polyamide resin composition, and evaluated in the same manner as in Example 1. Table 2 shows the evaluation results.

[0063]

[Table 2]

As shown in Table 2, Example 1 was excellent in dimensional stability, had a small friction coefficient and small abrasion amount assuming an actual machine, and was excellent as a sliding bearing. On the other hand, each of the comparative examples exhibited a high friction coefficient and a high wear amount.

[0065]

The sliding bearing for a copying machine or printer according to the present invention is a molded article made of a polyamide resin composition containing a polyamide resin having a specific structure and a specific modified polyolefin resin. It has excellent sliding characteristics. In addition, because of its excellent dimensional stability against moisture absorption and water absorption, strict product management is not required.

In the sliding bearing device for a copying machine or a printer according to the present invention, since the sliding portion in the housing is the above-described sliding bearing, the sliding bearing can be made of a material having the best slidability. Bearing device that can preferentially select a material excellent in mechanical characteristics and durability.

Further, by adopting a copying machine or a printer having at least an electrostatic latent image forming means, a developer supplying means, a developing means and a transferring means, a low output motor can be used as a driving motor with low friction. As a result, power saving and weight reduction can be achieved.

By using the slide bearing device for a process cartridge, the size and weight of the process cartridge can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a sliding bearing device.

FIG. 2 is a perspective view showing a flanged sliding portion of the plain bearing device.

FIG. 3 is a diagram illustrating a schematic configuration of a copying machine or a printer in the electrophotographic apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 4 Sliding part 2 Housing 3 Detent 4a Flange 5 Electrostatic latent image holder 6 Light beam 7 Developer 8 Developing roller 9 Sheet 10 Rotating blade for stirring 11, 12, 13 Rotating shaft 14 Charger 15 Cleaning device 16 Magnetic Element

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C10M 107/44 C10M 107/44 111/04 111/04 G03G 15/00 550 G03G 15/00 550 // ( C08L 77/06 (C08L 77/06 23:26) 23:26) C10N 20:02 C10N 20:02 30:00 30:00 Z 30:06 30:06 40:02 40:02 F-term (reference) 2H071 BA41 CA01 CA02 CA05 DA08 DA15 3J011 BA02 KA02 SC03 SC20 4F071 AA14 AA15 AA54 AA78 AA88 AF28 AH18 BA01 BB03 BB05 BB06 BC07 4H104 CA01R CB07A CB08A CB09A CE13A EA02A EA02R LA03 LA20 LA02 LA00

Claims (4)

[Claims] 1. A plain bearing for a copying machine or printer formed by molding a polyamide resin composition, wherein the polyamide resin composition comprises a polyamide resin of 65 to 7%.
5% by weight and a modified polyolefin resin in an amount of 35 to 25% by weight.
7 to 63 mol%, the structural unit represented by (II)
Mol%, the intrinsic viscosity measured in concentrated sulfuric acid at 30 ℃ is 1.15
1.41.40 dl / g. The modified polyolefin resin is a polyolefin resin having an intrinsic viscosity of 6 to 40 dl / g and a polyolefin resin of 0.1 to 5 dl / g measured at 135 ° C. in decalin, respectively. A sliding bearing for a copier or a printer, characterized by being a modified polyolefin resin modified with up to 5% by weight of an unsaturated carboxylic acid or a derivative thereof. 2. A sliding bearing device for a copying machine or a printer comprising a sliding portion and a housing for holding the sliding portion, wherein the sliding portion is the sliding bearing according to claim 1. Slide bearing device for copiers or printers. 3. The copier or printer according to claim 2, wherein said copier or printer comprises at least an electrostatic latent image forming means, a developer supply means, a developing means and a transfer means. Sliding bearing device. 4. The sliding bearing device according to claim 2, wherein the sliding bearing device is a sliding bearing device for a process cartridge.
A sliding bearing device for a copying machine or a printer according to claim 3.