JP2001026673A - Rubber composition and carriage roller using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide rubber compositions which is difficult to cause surface roughening even when extruded and have good abrasion resistance of carriage rollers to be obtained, and carriage rollers to be obtained from these rubber compositions. SOLUTION: A carriage roller 1 is constituted by molding/crosslinking a rubber composition. This rubber composition contains 100 pts.wt. rubber whose major component is an EPDM (ethylene/propylene/diene copolymer) polymerized with the use of a metallocene catalyst and 10-20 pt.wt. resin crosslinking agent. The molecular distribution (Mw/Mn) of this EPDM is not greater than 2.5. Further, the viscosity ratio (V100)/(V10) at 100 deg.C of the EPDM is not smaller than 2.5E-2. This rubber composition contains zinc oxide, zinc carbonate, an alkylbenzenesulfonic acid or a metal halide as the crosslinking activator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composition for a paper feed roller mounted on office equipment and the like, and a paper feed roller using the rubber composition.

[0002]

2. Description of the Related Art Copiers, facsimile machines, printers, A
A paper feed roller (referred to as a paper feed roller, a transport roller, a paper discharge roller, etc.) is used for a paper feed mechanism, a paper transport mechanism, a paper discharge mechanism, and the like of office equipment such as a TM. Since the paper feed roller feeds paper, film, and the like, it is required that the friction coefficient be high, and that the high friction coefficient be maintained for a long time.

Usually, rubber such as EPDM (ethylene-propylene-diene copolymer), natural rubber, urethane rubber, chloroprene rubber and polynorbornene is used for the paper feed roller, so that the paper feed roller has flexibility. And the coefficient of friction with paper is increased. Among these rubbers, EPDM, whose main chain is made of a chemically stable saturated hydrocarbon and which is hardly deteriorated by molecular main chain cleavage even when exposed to high concentration ozone for a long time, is particularly preferably used. ing. The use of EPDM imparts ozone resistance to the paper feed roller, and suppresses ozone deterioration of the paper feed roller even when the paper feed roller is mounted on an electrophotographic apparatus that generates ozone during formation of an electrostatic latent image.

[0004] Rubber products are usually used by crosslinking.
As a means of crosslinking, sulfur crosslinking is generally used. But,
EPDM has a main chain made of a saturated hydrocarbon as described above, and the double bond is a diene component such as DCPD (dicyclopentadiene), 1,4-HD (1,4-hexadiene), and ENB (ethylidene norbornene). And so on, there is an inconvenience that if this is vulcanized with sulfur, the vulcanization reaction does not easily proceed and the vulcanization time becomes long. Although it is possible to improve the vulcanization rate by using a vulcanization accelerator in combination, the vulcanization accelerator generally has a high polarity, whereas EPDM has a low polarity, and therefore, the vulcanization accelerator present in the paper feed roller after vulcanization is present. A reaction product of the sulfur accelerator or an unreacted residual accelerator may bloom on the surface of the paper feed roller. When blooming occurs, the coefficient of friction between the paper feed roller and the paper decreases, and good paper feed performance cannot be exhibited.

In some cases, a resin crosslinking agent is used instead of sulfur. By using the resin crosslinking agent, the crosslinking time of EPDM is shorter than that of sulfur. Further, since the vulcanization accelerator is not used in combination with the resin crosslinking agent, the reaction product of the vulcanization accelerator and the unreacted residual vulcanization accelerator do not bloom on the surface of the paper feed roller. For this reason, good paper feeding performance of the paper feeding roller is maintained.

Incidentally, reinforcing fillers such as carbon black and silica are often compounded in rubber compositions for the purpose of improving the strength of molded articles. However, if a large amount of reinforcing filler is mixed into the paper feed roller, its wear resistance will be reduced. For this reason, in the paper feed roller, the compounding amount of the reinforcing filler is suppressed, and the wear resistance is maintained while the strength is sacrificed to some extent. As described above, if the paper feed roller whose strength is not sufficiently high is formed by the compression molding method, the molded product may be torn at the time of demolding.

[0007] In order to solve such inconvenience, an extrusion molding method is usually employed for the paper feed roller. In the extrusion molding method, no stress is applied to the paper feed roller as in the demolding of the compression molding method, so that the paper feed roller does not tear off.

[0008]

However, when the rubber composition for the paper feed roller is extruded into a tube shape,
The surface is in a so-called roughened state. The roughened surface is polished and removed in the subsequent polishing step. However, when the surface is severely roughened, it is necessary to set a larger polishing allowance.
As a result, increased material costs due to wasted material,
There is a problem that the productivity is reduced due to the prolonged polishing process.

By using EPDM having a relatively low molecular weight, the surface condition of the rubber composition after extrusion can be improved. However, a paper feed roller using low molecular weight EPDM is inferior in abrasion resistance and has a problem that the amount of abrasion due to paper passing increases.

[0010] The present invention has been made in view of such circumstances, and a rubber composition and a rubber composition having good abrasion resistance of a paper feed roller to be obtained even when extruded, and a rubber composition comprising the rubber composition. It is an object of the present invention to provide an obtained paper feed roller.

[0011]

Means for Solving the Problems The invention made to achieve the above object is to provide 100 parts by weight of a rubber mainly composed of EPDM polymerized by a metallocene catalyst, and 1 to 20 parts by weight of the rubber. A rubber composition for a paper feed roller, comprising a resin crosslinking agent.

Since the rubber composition contains EPDM polymerized by a metallocene catalyst as a main component, the roughening due to extrusion hardly occurs. In addition, the paper feed roller formed from the rubber composition has excellent wear resistance.

Preferably, the molecular weight distribution (Mw
/ Mn) is 2.5 or less, and 100
The viscosity ratio (V1000 / V10) at 25 ° C is 2.5E-
2 or more.

Preferably, the rubber composition contains a crosslinking activator. Suitable crosslinking activators include zinc oxide, zinc carbonate and metal halides, which may be used alone or as a mixture of two or more. Also, as a crosslinking activator,
Alkyl benzene sulfonic acid or a salt thereof may be used. The amount of the crosslinking activator is preferably 0.1 to 15 parts by weight based on 100 parts by weight of rubber.

The rubber composition of the present invention is particularly suitable for a paper feed roller obtained by extrusion molding.

[0016]

Embodiments of the present invention will be described below with reference to the drawings as appropriate. FIG. 1 is a perspective view showing a paper feed roller 1 according to one embodiment of the present invention together with a shaft core 2. The paper feed roller 1 is formed by molding and crosslinking a rubber composition. The paper feed roller 1 is formed by pressing the paper feed roller 1 into the shaft core 2 or by joining the two with an adhesive.
It is fixed to.

The thickness of the paper feed roller 1 is preferably 1 mm or more and 8 mm or less, particularly preferably 2 mm or more and 5 mm or less. If the thickness is less than the above range, the contact area between the paper and the paper to be fed may be small. Conversely, if the thickness exceeds the above range, a large pressing force is required to deform the paper feed roller 1, and the mechanism for pressing may become large. Further, the overall length of the paper feed roller 1 (indicated by a double-headed arrow L1 in FIG. 1) is not particularly limited, but is usually about 10 mm to 20 mm.

The rubber composition used for the paper feed roller 1 is an EPDM polymerized by a metallocene catalyst.
As a main component. The metallocene catalyst is a highly active polymerization catalyst comprising a cyclopentadienyl derivative of a Group IV metal such as titanium or zirconium and a cocatalyst. EPDM polymerized by a metallocene catalyst (hereinafter also referred to as “metallocene EPDM”) is EPDM polymerized by a Ziegler-Natta catalyst (hereinafter “Ziegler EP”).
DM), the molecular weight distribution is narrower and the monomer distribution is more uniform. Therefore, the metallocene EPDM
The surface condition is good even when a rubber composition mainly composed of is extruded, and the paper feed roller 1 obtained from this rubber composition has excellent wear resistance. Moreover, the surface condition and abrasion resistance are not significantly affected by the molecular weight of EPDM. That is, as in the conventional paper feed roller, a roller having a good surface condition at the time of extrusion has poor abrasion resistance, and a roller having excellent abrasion resistance does not have a poor surface condition at the time of extrusion. Surface condition and wear resistance are compatible.

The molecular weight distribution of the metallocene EPDM (Mw /
Mn) is preferably at most 2.5, particularly preferably at most 2.2. When the molecular weight distribution (Mw / Mn) is within the above range, the wear resistance of the paper feed roller 1 is further improved,
The amount of wear due to paper passing is reduced, and the life of the paper feed roller 1 is extended. Since the lower the molecular weight distribution (Mw / Mn), the better, it is not necessary to define the lower limit in the present invention, but the molecular weight distribution (Mw / Mn) of the usually obtained metallocene EPDM is 1.6 or more. The molecular weight distribution (Mw / Mn) of the metallocene EPDM is a value obtained by dividing the weight average molecular weight Mw measured by gel permeation chromatography (GPC) by the number average molecular weight Mn.

The viscosity ratio (V1000 / V10) of the metallocene EPDM at 100 ° C. is preferably 2.5E-2 or more, particularly preferably 2.8E-2 or more. Viscosity ratio (V1
000 / V10) within the above range, the surface condition of the rubber composition during extrusion is improved. That is,
Skin roughness is prevented. Therefore, it is not necessary to set a large polishing allowance for the molded product, and the material cost and productivity of the paper feed roller 1 are improved. Viscosity ratio (V1000 / V10)
It is not necessary to define the upper limit in the present invention because the larger is the larger, the metallocene EP usually obtained is
The viscosity ratio of DM (V1000 / V10) is 8.0E-2 or less.

The viscosity ratio of metallocene EPDM at 100 ° C. (V1000 / V10) is such that the shear rate is 1000 / s.
Is the value obtained by dividing the viscosity V1000 of the metallocene EPDM alone at a shear rate of 10 / s by the viscosity V10 of the metallocene EPDM alone at a shear rate of 10 / s. Temperature 100 ° C, shear rate 1
The condition of 000 / s substantially corresponds to the condition at the time of ordinary extrusion. That is, the value of the viscosity ratio (V1000 / V10) is
It correlates with the viscosity of the rubber composition during extrusion. In addition, the shearing speeds V1000 and V10 are measured by a constant speed capillary rheometer (trade name “Monsanto Workability Tester MPT” manufactured by Monsanto Flexis).

The molecular weight distribution (Mw / Mn) is 2.5 or less, and the viscosity ratio at 100 ° C. (V1000 / V10)
Is 2.5E-2 or more, the good surface state and the abrasion resistance of the paper feed roller 1 at the time of extrusion are more compatible with each other. Ziegler E
No PDM satisfied both the molecular weight distribution (Mw / Mn) of 2.5 or less and the viscosity ratio (V1000 / V10) of 2.5E-2 or more. By using the metallocene catalyst, EPDM satisfying both of them can be obtained.

The paper feed roller 1 has a metallocene EP
Other rubbers may be compounded with DM. Examples of the rubber to be blended include Ziegler EPDM, natural rubber, urethane rubber, chloroprene rubber, polynorbornene, butadiene rubber, and isoprene rubber. Even when other rubber is compounded, metallocene EPDM needs to be the main component in order to prevent roughening during extrusion and maintain the wear resistance of the paper feed roller 1. Specifically, the ratio of metallocene EPDM to total rubber is 50%.
% By weight or more, particularly 70% by weight or more.

There are two types of EPDM: a non-oil-extended type EPDM comprising only a rubber component and an oil-extended type EPDM containing a confidential oil together with a rubber component. Things can also be used. When an oil-extended type EPDM is used, the amount of only the rubber component excluding the confidential oil is used for calculating the blending ratio.

The rubber composition used for the paper feed roller 1 is crosslinked by a resin crosslinking agent. The resin crosslinking agent is
The rate of crosslinking EPDM is faster than that of sulfur. Further, when a resin crosslinking agent is used, it is not necessary to use a vulcanization accelerator in combination, so that the problem of blooming caused by the vulcanization accelerator does not occur. Suitable resin crosslinking agents include, for example, halogenated alkylphenol resins, alkylphenol formaldehyde condensates, triazine / formaldehyde condensates, sulfurized / p-tert-butylphenol resins, alkylphenol / sulfide resins, hexamethoxymethyl / melamine resins, and the like.

The compounding amount of the resin crosslinking agent is 1 part by weight or more and 20 parts by weight or less, preferably 5 parts by weight or more and 15 parts by weight or less based on 100 parts by weight of rubber. If the amount is less than the above range, insufficient crosslinking may occur, and the abrasion resistance of the paper feed roller 1 may be reduced. Conversely, if the compounding amount exceeds the above range, the hardness of the paper feed roller 1 may increase and the friction coefficient may decrease.

The rubber composition used in the paper feed roller 1 may contain a crosslinking activator for the purpose of accelerating crosslinking. Suitable crosslinking activators include, for example, zinc oxide, zinc carbonate, metal halides, alkylbenzene sulfonic acids (including their salts), and the like. Of these crosslinking activators, zinc oxide, zinc carbonate and metal halides may be used in combination of two or more, but alkylbenzene sulfonic acid causes crosslinking inhibition when used in combination with other crosslinking activators. Used in

The amount of the crosslinking activator is preferably from 0.1 to 15 parts by weight based on 100 parts by weight of rubber.
In particular, the amount is preferably from 0.1 part by weight to 5 parts by weight. If the amount is less than the above range, insufficient crosslinking may occur, and the abrasion resistance of the paper feed roller 1 may be reduced. vice versa,
If the compounding amount exceeds the above range, crosslinking starts too early, and rubber burning may occur at the time of molding or crosslinking of the rubber composition.

The rubber composition used for the paper feed roller 1 may be blended with a softening agent such as an oil or a plasticizer for the purpose of improving workability and adjusting hardness. Examples of oils to be blended include paraffinic mineral oils, naphthenic mineral oils, aromatic mineral oils, and synthetic oils composed of hydrocarbon oligomers. When oil is blended, the blending amount is about 1 to 200 parts by weight based on 100 parts by weight of rubber. Note that an oil-extended rubber in which oil is previously blended with a rubber component may be used. Examples of the plasticizer to be blended include dioctyl phthalate, dibutyl phthalate, dioctyl sepate, dioctyl adipate, and the like.

The rubber composition used for the paper feed roller 1 includes silica, carbon black, clay, talc,
A filler such as barium sulfate may be blended. However, if the compounding amount of the filler increases, the abrasion resistance of the paper feed roller 1 decreases, so that the compounding amount is about 10% by weight or less of the total weight of the paper feed roller 1.

The rubber composition used for the paper feed roller 1 may contain an appropriate amount of an antioxidant, a wax, and various other additives, if necessary, in addition to the above-mentioned compounding agents.

[0032]

EXAMPLES Hereinafter, the effects of the present invention will be clarified based on examples, but it is needless to say that the present invention should not be construed as being limited based on the description of the examples.

Example 1 The molecular weight distribution (Mw / Mn) was 2.2 and the viscosity ratio at 100 ° C. (V1000 /
V10) a metallocene EPDM having 3.35E-2
(Dupont Elastomer's product name "Nodel IP47
70 ") 100 parts by weight, 12 parts by weight of an alkylphenol formaldehyde resin as a resin cross-linking agent (trade name" Takkirol 250-3 "of Taoka Chemical Co., Ltd.), paraffin oil (trade name" PW-380 "of Idemitsu Kosan Co., Ltd.) 100
Parts by weight and 1 part by weight of zinc oxide (Mitsui Metal Mining Co., Ltd.) as a cross-linking activator were put into a 10 liter kneader, and 70 ° C.
For 5 minutes to obtain a rubber composition. This rubber composition was put into a φ60 mm extruder (Nakada Engineering Co., Ltd.) and extruded at a temperature of 90 ° C. to obtain a cylindrical molded body. The outer diameter of this molded body was 20 mm, and the inner diameter was 10 mm. This molded body is mounted on a vulcanizing core and put into a vulcanizing can,
Crosslinking was performed under the conditions of a crosslinking temperature of 160 ° C and a crosslinking time of 30 minutes to obtain a crosslinked body. This crosslinked body was mounted on a polishing core and polished with a cylindrical grinder until the outer diameter became 20 mm. Then, the sheet was cut into a length of 20 mm with a lathe to obtain a paper feed roller of Example 1.

Comparative Examples 1 to 3 Metallocene EP
Ziegler EPDM (Sumitomo Chemical Co., Ltd.) having 100% oil extension, a molecular weight distribution (Mw / Mn) of 1.9, and a viscosity ratio (V1000 / V10) at 100 ° C. of 2.17E-2 instead of DM. Company name "Esprene 67
0F ") A paper feed roller of Comparative Example 1 was obtained in the same manner as in Example 1 except that 200 parts by weight (rubber component: 100 parts by weight) was used.

Instead of the metallocene EPDM, a Ziegler EPDM (Sumitomo Chemical Co., Ltd.) having a molecular weight distribution (Mw / Mn) of 3.0 and a viscosity ratio (V1000 / V10) at 100 ° C. of 5.15E-2 is 5.15E-2. A paper feed roller of Comparative Example 2 was obtained in the same manner as in Example 1 except that 100 parts by weight of the product name "Esprene 505") was used.

Further, instead of metallocene EPDM, a Ziegler EPDM (Sumitomo Chemical Co., Ltd.) having a molecular weight distribution (Mw / Mn) of 2.6 and a viscosity ratio (V1000 / V10) at 100 ° C. of 2.88E-2 is used. A paper feed roller of Comparative Example 3 was obtained in the same manner as in Example 1 except that 100 parts by weight of trade name “Esprene 505A”) was used.

Example 2 The paper of Example 2 was prepared in the same manner as in Example 1 except that 20 parts by weight of sedimentable barium sulfate (trade name “5T sedimentable barium sulfate” of Nippon Chemical Industry Co., Ltd.) was further added. A feed roller was obtained.

[Comparative Example 4] A formulation was prepared using Ziegler EPDM.
200 parts by weight (rubber component: 100 parts by weight), zinc oxide (Mitsui Metal Mining Co., Ltd.) 5
Parts by weight, 1.5 parts by weight of sulfur (powder sulfur of Tsurumi Chemical Co., Ltd.), 1.5 parts by weight of a vulcanization accelerator (trade name “Noxeller TET” of Ouchi Shinko Chemical Co., Ltd.) and other vulcanization accelerators ( A paper feed roller of Comparative Example 4 was obtained in the same manner as in Example 1 except that 0.5 part by weight of the product name (Noxeller M of Ouchi Shinko Chemical Co., Ltd.) was used.

Example 3, Example 4, Comparative Example 5, and Comparative Example 6 The same procedure as in Example 1 was carried out except that the amount of the resin crosslinking agent was varied as shown in Table 2 below. The paper feed rollers of Example 3, Example 4, Comparative Example 5, and Comparative Example 6 were obtained.

[Examples 5 to 7] In place of zinc oxide, zinc carbonate (trade name "transparent zinc white" of Sakai Chemical Industry Co., Ltd.)
A paper feed roller of Example 5 was obtained in the same manner as in Example 1 except for using. Further, a paper feed roller of Example 6 was obtained in the same manner as in Example 1 except that p-toluenesulfonic acid (Tokyo Kasei Co., Ltd.) was used instead of zinc oxide. Further, a paper feed roller of Example 7 was obtained in the same manner as in Example 1 except that tin chloride (Tokyo Kasei Co., Ltd.) was used as a metal halide instead of zinc oxide.

[Observation of Extruded Skin] When the rubber composition was extruded into a cylindrical molded product, the surface condition of the extruded molded product was visually observed. The sample having good surface condition without skin roughness was rated as “○”, and the sample with rough surface was rated as “x”.

[Measurement of Hardness] The hardness of the obtained paper feed roller was measured with an A-type hardness meter according to JIS-K-6253.

[Measurement of Initial Coefficient of Friction] As shown in FIG.
The paper feed roller 1 was pressed against the plate 3 by applying a load W of 250 gf to the shaft core 2 while sandwiching A4 size PPC paper 5 (Fuji Xerox Office Supply Co., Ltd.).
Next, the paper feed roller 1 was rotated at a peripheral speed of 300 mm / sec in the direction indicated by the arrow R in FIG. Then, the force (gf) generated in the direction indicated by the white arrow F in FIG. 2 was measured by the load cell 4, and the value obtained by dividing the force F by the load W was obtained as the initial friction coefficient. Measurements were made at a temperature of 23 ° C and a humidity of 55%
Was performed under the following conditions.

[Paper Passing Test] Each paper feed roller was attached to a shaft made of synthetic resin, and attached to a copying machine (trade name “VIVACE” of Fuji Xerox Co., Ltd.) as a paper feed roller. Under the conditions of a temperature of 23 ° C. and a humidity of 55%, the above A4
10,000 sheets of size PPC paper were passed for 5 hours. The weight of the paper feed roller was measured before and after the paper was passed, and the difference was defined as the amount of wear. Further, the friction coefficient of the paper feed roller after passing the paper was measured according to the above-described method of measuring the initial friction coefficient.

[Aging Test] The paper feed roller whose initial friction coefficient was measured was left for 6 months in an environment of a temperature of 23 ° C. and a humidity of 55%. Then, the surface of the paper feed roller was visually observed to determine the presence or absence of blooming. Those in which blooming was not observed were marked with “○”, and those in which blooming was seen were marked with “x”. Further, the friction coefficient of the paper feed roller was measured according to the above-described method of measuring the initial friction coefficient. The results of these evaluations are shown in Tables 1 and 2 below. For comparison, the evaluation results of the paper feed roller of Example 1 are shown in both Table 1 and Table 2.

[0046]

[Table 1]

[0047]

[Table 2]

Appropriate values of each evaluation item in Tables 1 and 2 are as follows: hardness is 40 or less, initial friction coefficient is 2.0 or more, friction coefficient after paper passing is 2.0 or more, Is 20 mg or less, and the friction coefficient after aging is 2.0 or more. In the paper feed roller of Comparative Example 1 using Ziegler EPDM having a small viscosity ratio (V1000 / V10), the extruded skin is poor. Further, in the paper feed rollers of Comparative Examples 2 and 3 using Ziegler EPDM having a large molecular weight distribution (Mw / Mn), the abrasion loss is large. In addition, blooming is observed in the paper feed roller of Comparative Example 4 crosslinked with sulfur and a vulcanization accelerator. Further, the paper feed roller of Comparative Example 5 in which the blending amount of the resin crosslinking agent is small has a large amount of wear. Further, the paper feed roller of Comparative Example 6 in which the blending amount of the resin crosslinking agent is large has a high hardness and a small friction coefficient. In contrast, the molecular weight distribution (Mw / Mn) of EPDM is 2.5 or less, and the viscosity ratio at 100 ° C. (V1000 / V1)
0) is 2.5E-2 or more metallocene EPDM is used, and the paper feed roller of each resin crosslinking agent having a compounding amount of the resin crosslinking agent of 1 part by weight or more and 20 parts by weight or less is suitable for all the evaluation items. Indicates the value. From the evaluation results, the superiority of the present invention was confirmed.

[0049]

As described above, the rubber composition of the present invention hardly causes rough skin even when extruded.
Further, the paper feed roller of the present invention has good wear resistance. By using the rubber composition of the present invention, the material cost of the paper feed roller is reduced, and the productivity is improved. This paper feed roller can withstand long-term use.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a paper feed roller according to one embodiment of the present invention together with a shaft core.

FIG. 2 is a schematic front view showing a state of measuring a friction coefficient of a paper feed roller.

[Explanation of symbols]

 1 Paper feed roller 2 Shaft core 3 Plate 4 Load cell 5 PPC paper

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C08K 3/26 C08K 3/26 F term (Reference) 3F049 CA12 4F207 AA09 AA45 AB03 AG08 AG14 AH05 AH53 AR17 KA01 KA17 KF02 4J002 BB151 CC072 CC182 CC192 CE002 CN012 DD026 DE106 DE246 EV237 EV238 FD010 FD020 FD142 FD156 FD157 FD158 GM00

Claims (7)

[Claims] An EP polymerized by a metallocene catalyst
A rubber composition for a paper feed roller, comprising 100 parts by weight of a rubber containing DM as a main component and 1 to 20 parts by weight of a resin crosslinking agent. 2. The molecular weight distribution of the EPDM (Mw / M
n) is 2.5 or less and the viscosity ratio (V
1000 / V10) is 2.5E-2 or more.
3. The rubber composition according to item 1. 3. The rubber composition according to claim 1, further comprising zinc oxide, zinc carbonate, or a metal halide as a crosslinking activator. 4. The rubber composition according to claim 1, further comprising an alkylbenzenesulfonic acid or a salt thereof as a crosslinking activator. 5. The rubber composition according to claim 3, wherein the amount of the crosslinking activator is 0.1 to 15 parts by weight based on 100 parts by weight of the rubber. 6. A paper feed roller formed from the rubber composition according to any one of claims 1 to 5. 7. The molding according to claim 6, which is formed by an extrusion molding method.
A paper feed roller according to item 1.