JP2000289876A - Sheet separation sheet for paper feed mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper sheet separation sheet 6 in which a decrease in friction coefficient is suppressed even after long-term use and a manufacturing process is simple. A sheet feeding mechanism is formed by a sheet feeding roller and a tray. The tray 4 is provided with a sheet separation sheet 6 near the paper feed roller 2 on the upper surface thereof. In the paper sheet separation sheet 6, rubber particles dynamically cross-linked by a resin cross-linking agent are dispersed in a thermoplastic polymer, and the weight ratio of the rubber to the thermoplastic polymer is 20/80 or more and 70/30.
It is formed from the following elastomer composition. EPDM is used as the rubber. As the thermoplastic polymer, a polyolefin-based resin or a hydrogenated styrene-based thermoplastic elastomer is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet separating sheet used for a sheet feeding mechanism of a copying machine, a printer, a facsimile, and the like.

[0002]

2. Description of the Related Art In a paper feed mechanism, paper sheets such as PPC paper and OHP paper are stored in a tray, and the paper sheets are sent to an image forming mechanism by a paper feed roller or the like. The coefficient of friction between the paper feed roller and the paper sheets needs to be relatively large. Specifically, the coefficient of friction between the sheet and the paper feed roller must be larger than the coefficient of friction between the sheets. As a result, the sheets are surely separated one by one and sent to the image forming mechanism, so that a so-called double feed is prevented.

In this paper feed mechanism, no matter how large the coefficient of friction between the paper sheets and the paper feed roller is, if the number of remaining paper sheets in the tray becomes small (for example, about several sheets), the remaining paper sheets will be lost. All leaves may be sent at once and double feeds may occur. This is because the sheets are not separated one by one because the coefficient of friction between the tray and the sheets is smaller than the coefficient of friction between the sheets. In order to prevent double feeding when the number of remaining sheets is small, it is necessary that the coefficient of friction between the tray and the sheets is relatively large.

However, if the coefficient of friction between the tray and the sheet is too large and becomes larger than the coefficient of friction between the paper feed roller and the sheet, the last sheet in the tray cannot be fed and the so-called paper is not sent. The rest will occur. In order to prevent the remaining paper, it is necessary that the coefficient of friction between the tray and the sheet is smaller than the coefficient of friction between the sheet feeding roller and the sheet. That is, in this type of paper feeding mechanism, in order to achieve both prevention of double feeding and prevention of remaining paper, the friction coefficient μF between the paper feeding roller and the paper sheet, the friction coefficient μR between the tray and the paper sheet, and the paper sheet The friction coefficient μP between the classes needs to be in a relationship represented by the following formula μF>μR> μP (I).

[0005] The tray is usually made of synthetic resin. Since the surface of the synthetic resin molded body has a small friction coefficient, it is difficult to set μR in the range represented by the above formula (I) with a synthetic resin alone. In order to set μR in the range represented by the above formula (I), synthetic leather was used in the old days. That is, the paper sheet separation sheet made of the synthetic leather was attached to the tray surface with a double-sided tape or the like. The surface of the synthetic leather was moderately fuzzy, and it was easy to set μR in the range represented by the above formula (I).

[0006] A rubber sheet has been proposed as a more industrial paper sheet separation sheet, and has become the mainstream of the paper feeding mechanism. The surface of the rubber sheet is polished to increase the surface roughness. By increasing the surface roughness, it is possible to suppress a sharp decrease in the coefficient of friction even when the surface is worn by using the sheet feeding mechanism. Such a sheet separation sheet is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-170348.

[0007]

However, even with a rubber sheet having an increased surface roughness, if the surface is significantly worn by use for a long period of time, the coefficient of friction is reduced due to a decrease in the surface roughness. Sometimes. Further, this rubber sheet requires a surface polishing step, and the surface roughness must be delicately adjusted so as to have a friction coefficient within a predetermined range in the surface polishing step, so that the production cost increases. The present invention has been made in view of such a problem, and it is an object of the present invention to provide a paper sheet separation sheet in which a decrease in friction coefficient is suppressed even after long-term use, and the manufacturing process is simple. Things.

[0008]

Means for Solving the Problems An invention made to solve the above-mentioned problem is that rubber particles dynamically crosslinked by a resin crosslinking agent are dispersed in a thermoplastic polymer, and the rubber and the thermoplastic polymer are dispersed. And a sheet separation sheet for a paper feed mechanism formed from an elastomer composition having a weight ratio of 20/80 to 70/30.

In the elastomer composition used for the paper sheet separation sheet, rubber is dynamically crosslinked. Dynamic cross-linking means a process in which rubber, a cross-linking agent, and other various additives are blended with a thermoplastic polymer, and the rubber is cross-linked by heating while kneading. The rubber crosslinked by dynamic crosslinking disperses as fine particles in the thermoplastic polymer. For this reason, fine irregularities composed of rubber particles exist on the surface of the paper sheet separation sheet. Therefore, a predetermined range of surface roughness can be achieved even if the surface polishing step is omitted or shortened. Also,
Since the state in which the rubber particles are dispersed in the matrix of the thermoplastic polymer extends from the surface to the inside, even if the surface is worn due to long-term use, a substantially constant surface roughness can always be maintained. Therefore, it is possible to suppress a change with time of the friction coefficient. The smaller the rubber particles, the more preferably they are uniformly dispersed, and the average particle diameter is 10 μm or less,
In particular, it is preferably 5 μm or less.

The weight ratio between the rubber and the thermoplastic polymer in the elastomer composition must be 20/80 or more and 70/30 or less. When the weight ratio is less than the above range, the paper sheet separation sheet becomes hard, and the decrease in hardness particularly at low temperature becomes large, and it becomes difficult to knead the elastomer composition. If the weight ratio exceeds the above range, the coefficient of friction between the paper sheet separation sheet and the paper is too large, and paper remaining easily occurs. From these viewpoints, the weight ratio is more preferably 25/75 or more and 60/40 or less.

The rubber used in the present invention is EPD.
M, natural rubber, butadiene rubber, styrene butadiene rubber, isoprene rubber, diene rubber such as acrylonitrile-butadiene rubber, ethylene-propylene rubber,
Examples thereof include chloroprene rubber, acrylic rubber, and chlorosulfonated polyethylene rubber, which may be used alone or as a blend of two or more. Among them, diene rubber is preferred. By using a diene rubber, it becomes possible to use a crosslinking agent which crosslinks the diene rubber but does not crosslink the thermoplastic polymer.

A particularly preferred rubber is EPDM. E
PDM has a main chain composed of a saturated hydrocarbon and does not contain a double bond in the main chain. For this reason, even when exposed to an environment such as a high-concentration ozone atmosphere or light irradiation for a long time, the molecular main chain is hardly cut, and the weather resistance is excellent. Therefore, it is suitable for a paper feeding mechanism of a copying machine or the like in which ozone is generated during image formation. EPDM also has relatively good dispersibility in thermoplastic polymers. In order to express these advantages of EPDM, even when EPDM and other rubber are blended,
The ratio of EPDM in the total rubber is preferably at least 50% by weight, particularly preferably at least 80% by weight. From the viewpoint of weather resistance, the higher the percentage of EPDM in the total rubber, the better, and therefore the upper limit is not particularly defined in the present invention. EP
Non-oil-extended EPD made of only rubber components
Oil-extended EPD containing confidential oil along with M and rubber components
Although M exists, any type can be used in the present invention. When an oil-extended EPDM is used, the proportion of the rubber component excluding the confidential oil in the total rubber may be 50% by weight or more (preferably 80% by weight or more).

The thermoplastic polymer used in the present invention is preferably a polyolefin-based resin or a hydrogenated styrene-based thermoplastic elastomer, and these may be used as a mixture.

Since the molecular chain of the polyolefin resin is saturated, it does not crosslink during dynamic crosslinking. For this reason, the elastomer composition after dynamic crosslinking exhibits plasticity. Furthermore, since polyolefin resins are generally inexpensive and readily available, the use of polyolefin resins can reduce the production cost of paper sheets separation sheets. Examples of the polyolefin resin used include polyethylene, polypropylene, ethylene-ethyl acrylate resin, ethylene-vinyl acetate resin, ethylene-methacrylic acid resin, and ionomer resin. Further, polyethylene or polypropylene polymerized using a so-called metallocene catalyst can also be used. These polyolefin resins may be used alone or as a mixture of two or more.

The hydrogenated styrene-based thermoplastic elastomer is mainly composed of a block copolymer consisting of a polystyrene end block and an elastomer intermediate block, and the double bond disappears by hydrogenation of the intermediate block. Therefore, no cross-linking occurs during dynamic cross-linking. For this reason, the elastomer composition after dynamic crosslinking exhibits plasticity. Examples of the hydrogenated styrene-based thermoplastic elastomer used include a styrene-ethylene-styrene copolymer, a styrene-ethylene / propylene-styrene copolymer, and a styrene-ethylene / butylene-styrene copolymer. Further, those obtained by blending these hydrogenated styrene-based thermoplastic elastomers with an olefin-based resin, oil, or the like in advance and marketed as a compound can also be suitably used.

In the present invention, the rubber particles are dynamically crosslinked by a resin crosslinking agent. The resin crosslinking agent is a synthetic resin that causes a rubber to undergo a crosslinking reaction by heating or the like. By using the resin crosslinking agent, it is possible to solve the problem of bloom caused when sulfur and the vulcanization accelerator are used in combination, and it is possible to prevent a reduction in the coefficient of friction of the paper sheet separation sheet.

As the resin crosslinking agent, an addition condensation type resin is used. Examples of the addition condensation type resin include phenol resin, melamine / formaldehyde resin, triazine /
Examples include a formaldehyde condensate and a hexamethoxymethyl melamine resin, and a phenol resin is particularly preferable. A phenol resin is obtained by a two-step reaction of an addition reaction and a condensation reaction between a phenol and an aldehyde, and is a polymer in which the two components are uniformly copolymerized. Therefore, the molecular weight, the reactivity, and the like are uniform, and the physical properties of the paper sheet separation sheet can be made constant. Specific examples of the phenol resin include phenol, alkylphenol,
Various phenol resins synthesized by the reaction of phenols such as cresol, xylenol, resorcin and aldehydes such as formaldehyde, acetaldehyde and furfural are exemplified. In particular, an alkylphenol / formaldehyde resin obtained by reacting an alkylphenol having an alkyl group bonded to the ortho-position or para-position of benzene with formaldehyde has excellent compatibility with rubber, is rich in reactivity, and has a long crosslinking reaction start time. Is preferable because it can be performed relatively quickly. The alkyl group of the alkylphenol / formaldehyde resin is usually an alkyl group having 1 to 10 carbon atoms, and specific examples include a methyl group, an ethyl group, a propyl group, and a butyl group. Further, a modified alkylphenol resin obtained by addition-condensation of sulfurized-p-tert-butylphenol and aldehydes, or an alkylphenol / sulfide resin can also be used as a resin crosslinking agent.

The compounding amount of the resin crosslinking agent is preferably 1 to 20 parts by weight, particularly preferably 8 to 15 parts by weight, based on 100 parts by weight of rubber. When the compounding amount of the resin crosslinking agent is less than the above range, insufficient crosslinking may occur, and the durability of the sheet separating sheet may be reduced.
Conversely, if the amount of the resin crosslinking agent exceeds the above range, excessive crosslinking may occur and thermal degradation of the elastomer composition due to abnormal heat generation during dynamic crosslinking may occur. When an oil-extended EPDM is used, a resin crosslinking agent in an amount within the above range may be blended with 100 parts by weight of the rubber component excluding the confidential oil.

In the present invention, the dynamic crosslinking is preferably carried out in the presence of a halogen such as chlorine, bromine, fluorine and iodine. Thereby, the reactivity at the time of dynamic crosslinking is enhanced, and the crosslinking becomes efficient. Since the above-mentioned EPDM does not have a double bond in the main chain, it is hard to cause a crosslinking reaction. Thus, especially in dynamic crosslinking where this EPDM is used,
The presence of halogen is important. In order to make halogen present at the time of dynamic crosslinking, a halogenated resin crosslinking agent may be used, or a halogen-donating substance may be blended into the elastomer composition.

Examples of the halogenated resin crosslinking agent include those obtained by halogenating each of the above addition condensation type resins. Above all, halogenated phenolic resins in which at least one halogen atom is bonded to the aldehyde unit of the phenolic resin, and particularly halogenated alkylphenol formaldehyde resins, have excellent compatibility with rubber, are rich in reactivity, and have a long time to initiate a crosslinking reaction. Is preferable because it can be performed relatively quickly.

The halogen donor may be a metal halide or a halogenated resin. Examples of the metal halide include tin chloride such as stannic chloride, iron chloride such as ferric chloride, and copper chloride such as cupric chloride. Examples of the halogenated resin include, for example, chlorinated polyethylene. These halogen donors may be used alone or in combination of two or more.

The elastomer composition used for the paper sheet separating sheet of the present invention may contain a softener such as an oil or a plasticizer. Thereby, the paper sheet separation sheet can be made low in hardness. Examples of oils to be blended include mineral oils such as paraffinic oils, naphthenic oils, and aromatic oils, and hydrocarbon oligomers such as oligomers of α-olefins, oligomers of butene, and oligomers of ethylene and α-olefin. And the like. In particular, an amorphous oligomer of ethylene and an α-olefin is preferable because it has excellent compatibility with the polyolefin resin. Examples of the plasticizer to be blended include dioctyl phthalate, dibutyl phthalate, dioctyl sepate, dioctyl adipate, and the like. In the oil-extended EPDM, the confidential oil acts as a softening agent, so that it is not particularly necessary to add another softening agent. Of course, a softener may be further added to the oil-extended type EPDM.

When oil is used as a softening agent, the amount of the oil is 1 part by weight or more based on 100 parts by weight of rubber.
It is preferably at most 00 parts by weight, particularly preferably at least 50 parts by weight and up to 100 parts by weight. When a plasticizer is used as a softening agent, the amount of the plasticizer is preferably 1 to 20 parts by weight, more preferably 1 to 10 parts by weight, based on 100 parts by weight of rubber. If the amount of the softening agent is less than the above range, processability may deteriorate and productivity may decrease. Conversely, if the amount of the softener exceeds the above range, the durability of the paper sheet separation sheet may decrease, and the friction coefficient may become too large. When an oil-extended type EPDM is used, the amount of oil including the oil-extended confidential oil may be within the above range.

A filler may be added to the elastomer composition used for the paper sheet separation sheet of the present invention, if necessary. By adding the filler, the mechanical strength of the sheet separating sheet is improved. Examples of the filler to be added include silica, carbon black, clay, talc, calcium carbonate, dibasic phosphite, basic magnesium carbonate, and alumina. The proportion of the filler in the elastomer composition is preferably 10% by weight or less. If the ratio of the filler exceeds the above range, the flexibility of the sheet separating sheet may be reduced.

An antioxidant may be added to the elastomer composition used for the paper sheet separation sheet of the present invention, if necessary. Examples of the added antioxidant include imidazoles such as 2-mercaptobenzimidazole, phenyl-α-naphthylamine, and N, N-di-β-.
Naphthyl-p-phenylenediamine, N-phenyl-
Examples include amines such as N'isopropyl-p-phenylenediamine, phenols such as di-tert-butyl-p-cresol, and styrenated phenol.

The elastomer composition used in the paper sheet separating sheet of the present invention may contain wax,
A coloring agent, a crosslinking assistant, and the like may be added.

The kneading of the elastomer composition used in the paper sheet separating sheet of the present invention can be carried out by a known kneading machine such as an open roll, a Banbury mixer, a kneader, a single screw extruder, a twin screw extruder or the like. it can. Known molding means such as extrusion molding, injection molding, and compression molding are applied to the kneaded elastomer composition to obtain a paper sheet separation sheet.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view illustrating a sheet feeding mechanism using a sheet separation sheet according to an embodiment of the present invention. This paper feed mechanism includes a paper feed roller 2 and a tray 4. The tray 4 is provided with a sheet separation sheet 6 near the paper feed roller 2 on the upper surface thereof. Many sheets 8 are stacked and stored on the upper surface of the tray 4. A portion of the tray 4 closer to the paper feed roller 2 is pushed upward by a spring (not shown) that contacts the lower surface thereof,
It is pressed against the paper feed roller 2. Tray 4
The leading end portion 10 of the paper sheet 8 is sandwiched between the paper sheet separation sheet 6 and the paper feed roller 2.

In this paper feed mechanism, the friction coefficient μF between the paper feed roller 2 and the paper sheet 8, the friction coefficient μR between the tray 4 (that is, the paper sheet separation sheet 6) and the paper sheet 8, and the paper sheet 8 , 8
The friction coefficient μP between them has a relationship represented by the following expression μF>μR> μP (I). Sheets 8 are fed by this sheet feeding mechanism.
Is fed, first, the paper feed roller 2 rotates in the direction indicated by the arrow R in FIG. Since the uppermost sheet 8 is in contact with the sheet feeding roller 2 at the leading end portion 10, the sheet 8 is sent out with the rotation of the sheet feeding roller 2 and heads toward the image forming mechanism. At this time, the friction coefficient μF between the paper feed roller 2 and the sheet 8 is
Is smaller than the friction coefficient μP between the paper sheets 8, 8, the paper sheets 8 are not sent out or a plurality of paper sheets 8 are sent out in an overlapping manner.
Is larger than μP, the paper sheets 8 are sent out one by one from the top. When the number of the remaining sheets 8 on the tray 4 is, for example, two, the friction coefficient μR between the sheet separation sheet 6 and the sheet 8 is smaller than the friction coefficient μP between the sheets 8. Then, the remaining paper sheets 8 are overlapped and sent out, but since μR is larger than μP as described above, only the upper paper sheets 8 are sent out. When the last sheet 8 on the tray 4 becomes the last sheet, the friction coefficient μF between the sheet feeding roller 2 and the sheet 8 becomes the friction coefficient μR between the sheet separation sheet 6 and the sheet 8. If it is smaller than this, the paper sheets 8 will remain without being sent out, but since μF is larger than μR as described above, the last paper sheet 8 is also sent out. In this way, double feed and paper residue are prevented.

Since the paper sheet separation sheet 6 of the present invention is formed by dispersing dynamically crosslinked rubber particles in a thermoplastic polymer, the surface polishing step is omitted or the polishing time in the surface polishing step is reduced. Can be easily set to the range represented by the above formula (I).
Further, in the paper sheet separation sheet 6 of the present invention, the state in which the rubber particles are dispersed in the matrix of the thermoplastic polymer extends from the surface to the inside. Almost constant surface roughness can be maintained. Therefore, it is possible to suppress a change with time of the friction coefficient.

[0031]

EXAMPLES Hereinafter, the effects of the present invention will be clarified by experiments performed on the basis of examples. However, it should be understood that the present invention should not be construed as being limited based on the description of the examples. is there.

Example 1 EPDM (trade name "670F" of Sumitomo Chemical Co., Ltd.) oil-extended with 50% by weight of confidential oil was extruded using a twin-screw extruder ("2TR-75" of Moriyama Corporation). , 4 mm in diameter and 4 mm in length. 120 parts by weight of these pellets (60 parts by weight of a rubber component) and polypropylene as a thermoplastic polymer (Novatech PP MG05B (trade name of Nippon Polychem)
S ") and 40 parts by weight were mixed with a tumbler and charged into a twin-screw extruder (" ITMEC "HTM38"). From another inlet, 4.8 parts by weight of a brominated alkylphenol-formaldehyde resin (trade name “Tacchirol 250-3” of Taoka Chemical Co., Ltd.) as a resin crosslinking agent was charged, and 180
C. and kneaded and extruded in a ribbon shape (width 30 mm, thickness 3 mm). After cooling, this was sliced so that the thickness became half, and cut into a rectangle having a width of 10 mm and a length of 80 mm to obtain a paper sheet separation sheet of Example 1.

[Comparative Examples 1 and 2 and Examples 2 to 4] EP
The sheet separation sheets of Comparative Examples 1 and 2 and Examples 2 to 4 were obtained in the same manner as in Example 1 except that the amounts of DM and polypropylene were varied as shown in Table 1 below.

Examples 5 to 8 As shown in Table 2, the same procedures as in Example 1 were carried out except that the thermoplastic polymer was polyethylene (trade name "Sumikacene α GZ802" manufactured by Sumitomo Chemical Co., Ltd.). 5 was obtained.
The paper sheets of Example 6 were prepared in the same manner as in Example 1 except that the thermoplastic polymer was hydrogenated styrene-ethylene / propylene-styrene copolymer (SEPS, trade name “Septon 4055” of Kuraray Co., Ltd.). A separation sheet was obtained. Further, a sheet separation sheet of Example 7 was obtained in the same manner as in Example 1 except that 60 parts by weight of natural rubber was used instead of EPDM. Further, a sheet separation sheet of Example 8 was obtained in the same manner as in Example 1 except that the blending amount of EPDM was 60 parts by weight (the rubber component was 30 parts by weight) and 30 parts by weight of natural rubber was blended.

Comparative Example 3 50 parts by weight of EPDM (trade name "Esprene 505F" of Sumitomo Chemical Co., Ltd.), 50 parts by weight of butadiene rubber (trade name "BR11" of Nippon Synthetic Rubber Co., Ltd.), and sulfur (Tsurumi Chemical Co., Ltd.) 5 parts by weight) were kneaded with a closed kneader and formed into a sheet by an open roll. This was cut into a predetermined size and heated and vulcanized by a compression molding machine to obtain a rubber piece. This rubber piece was cut into the same size as the paper sheet separation sheet of Example 1 to obtain a paper sheet separation sheet of Comparative Example 3.

[Measurement of Friction Coefficient] Using a Haydon 10 type paper feeding mechanism, the friction coefficient μR between the paper sheet and the paper sheet separation sheet was measured. Specifically, first, the sheet separation sheets of the respective Examples and Comparative Examples are mounted on a tray, and PP is placed thereon.
Three sheets of C paper were placed one on top of the other and pressed against a paper feed roller with a spring. Next, the central PPC paper was pulled out, and the frictional force P1 at this time was measured. Next, the lowermost PPC sheet (that is, the PPC sheet in contact with the sheet separation sheet) was pulled out, and the frictional force P2 at this time was measured. Then, a frictional force P represented by the following equation P = P2−P1 / 2 was obtained, and this was divided by a previously measured spring load to derive a friction coefficient μR. The friction coefficient μR is
The measurement was performed at the initial stage and after the PPC paper was fed out 500 times one by one. This initial coefficient of friction and 500
Table 1 below shows the amount of change in the coefficient of friction due to each feeding.
And Table 2. The data of the paper sheet separation sheet of Example 1 is shown in both Table 1 and Table 2.

[Observation of Paper Passing State] The paper passing state of the PPC paper was observed using a printer (trade name “LBP750” manufactured by Canon Inc.) equipped with the sheet separation sheet of each of the examples and comparative examples. The observation was performed at the initial stage and after the PPC paper was fed out 500 times one by one. The results are shown in Tables 1 and 2 below.

[0038]

[Table 1]

[0039]

[Table 2]

In the comparative examples shown in Table 1, the evaluation was not performed because it was difficult to knead the elastomer composition and a satisfactory sheet separation sheet was not obtained. Further, in Tables 1 and 2, in the sheet separation sheets of Comparative Example 2 in which the rubber is 80 parts by weight and Comparative Example 3 in which the rubber is 100 parts by weight, paper residue is generated. This is because the coefficient of friction is too high. From these results, it was confirmed that the weight ratio between the rubber and the thermoplastic polymer needs to be 20/80 or more and 70/30 or less.

[0041]

As described above, according to the present invention,
Even when used for a long period of time, a reduction in the coefficient of friction can be suppressed, and a sheet separation sheet with a simple manufacturing process can be obtained. In the paper feeding mechanism equipped with the paper sheet separation sheet, double feeding of paper sheets and remaining paper are less likely to occur.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating a sheet feeding mechanism using a sheet separation sheet according to an embodiment of the present invention.

[Explanation of symbols]

 2 paper feed roller 4 tray 6 paper sheet separation sheet 8 paper sheet 10 tip

Continued on the front page F term (reference) 3F343 FA02 FA09 FB02 FB03 FB04 FC01 GA02 GB01 GC01 GD01 HA12 HC01 HD09 HD11 JD03 JD08 JD37

Claims (5)

[Claims] 1. Rubber particles dynamically crosslinked by a resin crosslinking agent are dispersed in a thermoplastic polymer, and the weight ratio of the rubber to the thermoplastic polymer is 20/80 or more and 70/3.
A sheet separation sheet for a sheet feeding mechanism formed from an elastomer composition having a value of 0 or less. 2. The paper sheet separation sheet according to claim 1, wherein the rubber contains at least 50% by weight of EPDM. 3. The paper sheet separation sheet according to claim 1, wherein the thermoplastic polymer is a polyolefin-based resin or a hydrogenated styrene-based thermoplastic elastomer. 4. The paper sheet separation sheet according to claim 1, wherein the resin crosslinking agent is a halogenated addition condensation type resin. 5. The paper sheet separation sheet according to claim 1, wherein the resin crosslinking agent is an addition condensation type resin, and the elastomer composition further contains a halogen donor.