JP2002069244A - Thermoplastic elastomer composition, manufacturing method of the same and rubber roller composed of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent oil bleeding from a rubber roller and a void (white-off) in the printed surface when it is used as a paper feeding roller. SOLUTION: The thermoplastic elastomer composition is obtained by compounding together a crosslinking agent, a rubber (A) crosslinkable by the crosslinking agent and a thermoplastic elastomer (B) uncrosslinkable by the crosslinking agent or a blend of the thermoplastic elastomer (B) uncrosslinkable by the crosslinking agent with a thermoplastic resin so that the ratio of (B) to (A) is 4>=B/A>=1/4 thereby dynamically crosslinking the rubber (A) by the crosslinking agent to be dispersed in the thermoplastic elastomer (B). The composition is designed so that it contains none or a little amount of a softening agent comprising oil to set the acetone extract thereof not lower than 0% but not higher than 20%. The rubber roller for feeding a paper is made of the elastomer composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic elastomer composition, a method for producing the same, and a rubber roller produced from the thermoplastic elastomer. In particular, a rubber roller used for paper feeding bleeds from the surface. The purpose of the present invention is to eliminate the oil and prevent the color loss on the printing surface.

[0002]

2. Description of the Related Art A rubber roller is used for a paper feed mechanism in an ink jet printer, a laser printer, an electrostatic copying machine, a plain paper facsimile machine, an automatic teller machine (ATM), and the like. Since the rubber roller needs to pick up and separate a conveyed object such as paper or film and feed the paper while separating, excellent flexibility and high abrasion resistance are required. Also, when printing high quality images such as photographic images,
If the printing paper has a small surface roughness and is a glossy paper, color loss (white loss) may occur at a portion contacting the rubber roller during paper feeding, which has been a problem in the past. This is because the oil that slightly bleeds from the paper feed rubber roller adheres to the printing paper, so that the ink in the area that comes in contact with the rubber roller during printing is repelled, and the color ride is worse than that in the area where the roller does not touch. It is thought to be. Therefore, in order to prevent the above-mentioned color loss (white loss), the amount of oil mixed as a softening agent in the composition used for the rubber roller is reduced as much as possible, or the paper is fed with a composition which can have low hardness without adding oil. It is necessary to make a rubber roller.

[0003] As a method for producing a thermoplastic elastomer for forming a rubber roller of this type, a conventional method is disclosed in Japanese Patent No. 302.
No. 7429, crumb EPDM rubber, 20 parts by weight to 2 parts by weight based on 100 parts by weight of polyolefin resin and rubber.
There is provided a method for producing a thermoplastic elastomer obtained by directly supplying 00 parts by weight of a softening agent to a twin-screw extruder and dynamically heat-treating the mixture in the presence of a crosslinking agent.

[0004]

Generally, a paper feed rubber roller is required to have high abrasion resistance.
It is made of vulcanized rubber such as rubber (ethylene-propylene-diene rubber), NR (natural rubber) and IIR (isobutylene-isoprene copolymer rubber). Requires a large amount of oil to be added. Therefore, it has been difficult to reduce the amount of oil added to such an extent that white spots on the printed surface are effectively prevented. On the other hand, when the paper feed rubber roller is made of a thermoplastic elastomer, the hardness can be reduced without adding oil, but in this case, there is a problem in heat resistance, and a practical paper feed rubber roller cannot be obtained. Was.

That is, in the method for producing a thermoplastic elastomer disclosed in Japanese Patent No. 3027429, one of the problems is to provide a production method capable of stably producing even if a large amount of a softening agent is mixed. ([0007]
Section). However, this patent discloses that a large amount of a softening agent is fed directly to a twin screw extruder together with a rubber and a polyolefin-based resin and dynamically heat-treated in the presence of a crosslinking agent to obtain a thermoplastic elastomer composition. However, there is no disclosure of suggesting the addition of a softening agent oil or the addition of a small amount of oil.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it has been made possible to add no oil or significantly reduce the amount of oil to be added. It is an object of the present invention to provide a thermoplastic elastomer composition capable of preventing inconvenience in which color loss (white loss) occurs in a portion in contact with a rubber, a method for producing the composition, and a rubber roller composed of the composition.

[0007]

In order to solve the above-mentioned problems, the present invention relates to the present invention, wherein the cross-linking agent, the rubber (A) cross-linked by the cross-linking agent, and the thermoplastic elastomer (C) not cross-linked by the cross-linking agent are used. B) or a thermoplastic elastomer (B) not crosslinked with a crosslinking agent and a blend of a thermoplastic resin, wherein (A) and (B) are blended in a ratio of 4 ≧ B / A ≧ 1/4, A thermoplastic elastomer composition obtained by dynamically crosslinking rubber (A) with the crosslinking agent and dispersing in the thermoplastic elastomer (B), wherein the composition does not contain a softening agent composed of oil or is softened. The amount of the extractables in acetone of the composition was reduced from 0% to 20% with the content of the agent being small.
% Of the thermoplastic elastomer composition. .

As described above, in the thermoplastic elastomer composition of the present invention, the rubber (A) and the thermoplastic elastomer (B) are blended at a fixed ratio,
Even when the amount of oil added is reduced so that the acetone extractable% of the composition is 0% or more and 20% or less, a thermoplastic elastomer composition that can provide a good paper feed rubber roller can be provided.

As the crosslinking agent, known crosslinking agents can be used. For example, as the resin crosslinking agent, a reactive phenol resin, a melamine-formaldehyde resin, a triazine
Formaldehyde condensate, hexamethoxymethyl melamine resin, and the like. Specific examples of the phenol resin include phenol, alkylphenol, cresol,
Various phenol resins synthesized by the reaction of phenols such as xylenol and resorcinol with aldehydes such as formaldehyde, acetaldehyde and furfural are exemplified. Further, sulfur and a vulcanization accelerator may be used, or a peroxide which does not react with the thermoplastic elastomer (B) may be used.

The amount of the resin cross-linking agent can be appropriately adjusted depending on various conditions such as the type of rubber and elastomer used, but generally 1 to 25 parts by weight based on 100 parts by weight of rubber. Is preferably 5 to 15 parts by weight.

[0011] The rubber (A) which is crosslinked by the crosslinking agent includes EPDM (ethylene-propylene-diene rubber),
Alternatively, it is preferably a mixture with another rubber containing EPDM as a main component. In the present invention, the rubber (A) is
M is most preferably 100%. When EPDM is blended with another rubber, EPDM accounts for the total rubber.
Is preferably at least 50 parts by weight, more preferably at least 80 parts by weight. The reason is that the main chain of EPDM is composed of a saturated hydrocarbon and does not contain a double bond. Therefore, even if the EPDM is exposed to an environment such as a high-concentration ozone atmosphere or light irradiation for a long time, the main chain of the molecule is not broken. This is because the weather resistance of the final product, for example, a roller, can be increased.

Examples of the rubber (A) include EPDM, butyl rubber, butadiene rubber, isoprene rubber, styrene butadiene rubber (SBR), chloroprene rubber, natural rubber (NR), 1,2-polybutadiene, acrylonitrile butadiene rubber, Examples include ethylene propylene rubber, acrylic rubber, and chlorosulfonated polyethylene.

As the thermoplastic elastomer (B), known thermoplastic elastomers can be used.
Styrene-butadiene-styrene copolymer (SBS),
Styrene-isoprene-styrene copolymer (SIS),
Styrene-ethylene / butylene-styrene copolymer (S
EBS), styrene-ethylene / propylene-styrene copolymer (SEPS), styrene-based elastomer such as styrene-ethylene-ethylene / propylene-styrene copolymer (SEEPS), chlorinated polyethylene, PVC-based elastomer, olefin-based elastomer, Urethane elastomer, ester elastomer, amide elastomer, ionomer, ethylene ethyl acrylate resin (EEA), ethylene vinyl acetate copolymer (EVA)
Are preferred.

When the thermoplastic elastomer and the thermoplastic resin are mixed, known thermoplastic resins can be used, for example, olefin resins such as polypropylene (PP) and polyethylene (PE), and polystyrene (PS). , Polyethylene terephthalate (PET), P
BT, nylon and the like. It is desirable that the mixture of the thermoplastic elastomer and the thermoplastic resin be an elastomer even after mixing. The reason is that the hardness of the thermoplastic elastomer composition finally obtained by dispersing the rubber becomes lower.

The mixing ratio of the thermoplastic elastomer and the thermoplastic resin can be determined appropriately according to the elastomer and the resin used. The mixing ratio of the thermoplastic resin to 100 parts by weight of the thermoplastic elastomer can be determined. 1
The content is not less than 100 parts by weight and not more than 100 parts by weight. The reason is 1
If the amount is less than 100 parts by weight, the effect of mixing with the resin will not be obtained. If the amount is more than 100 parts by weight, the elastomer will not be obtained.

As described above, the rubber (A) which is crosslinked with a crosslinking agent and the thermoplastic elastomer (B) which is not crosslinked with a crosslinking agent, or a mixture of a thermoplastic elastomer and a thermoplastic resin which are not crosslinked with the crosslinking agent are used as (A) ) (B) is 4 ≧ B
/ A ≧ 1/4. The reason is B
When / A is greater than 4, the wear resistance and the coefficient of friction decrease. On the other hand, when B / A is smaller than 1/4, kneading becomes difficult. The ratio B / A is calculated assuming that the numerical units of both AB are parts by weight. The values of A and B are values excluding oil when oil is added.

The percentage of acetone extractables of the thermoplastic elastomer composition of the present invention is from 0% to 20%. This is a correlation between the amount of extracted acetone and the amount of added oil. When the amount of the oil additive is 0 or a small amount, the amount of extracted acetone is 0% to 20% of the above ratio. This acetone extractable% is preferably 0% or more and 10% or less, and more preferably 0% or more and 5% or less.

As the oil, any commercially available petroleum softener or plasticizer can be used. Examples of the softener that can be used include known synthetic oils composed of mineral oils such as aroma, naphthene and paraffin, and hydrocarbon oligomers, or process oils. As plasticizers, phthalate, adipate and sebacate are available. System, phosphate system, polyether system, polyester system and the like.

As the rubber crosslinking method, resin crosslinking is preferred for the following reasons. That is, a resin cross-linking agent is used in resin cross-linking. However, the resin cross-linking agent is a synthetic resin that causes a cross-linking reaction to rubber by heating or the like, and causes a problem of bloom that occurs when sulfur and a vulcanization accelerator are used in combination. Not preferred. In particular, when a phenol resin is used as the resin crosslinking agent, the paper feeding performance can be improved.

Other resin crosslinking agents include melamine
Examples thereof include formaldehyde resin, triazine / formaldehyde condensate, hexamethoxymethyl / melamine resin, and the above-mentioned phenol resin is particularly preferable. Specific examples of the phenol resin include various phenol resins synthesized by a reaction of a phenol such as phenol, alkylphenol, cresol, xylenol, and resorcin with an aldehyde such as formaldehyde, acetaldehyde, and furfural. 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 an aldehyde, or an alkylphenol / sulfide resin can also be used as a resin crosslinking agent. The compounding amount of the resin crosslinking agent is preferably from 1 to 20 parts by weight, particularly preferably from 8 to 15 parts by weight, based on 100 parts by weight of rubber.

In the present invention, the dynamic crosslinking includes chlorine, bromine,
The reaction may be performed in the presence of halogen such as fluorine and iodine.
In order to allow halogen to be present during dynamic crosslinking, a halogenated resin crosslinking agent may be used, or a halogen-donating substance may be blended in 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, particularly halogenated alkylphenol formaldehyde resins, have excellent compatibility with rubber, are highly reactive, and have a high crosslinking reaction time. Is preferable because it can be performed relatively quickly.

Examples of the halogen-donating substance include tin chloride such as stannic chloride, ferric chloride, and cupric chloride. Examples of the halogenated resin include chlorinated polyethylene. These halogen-donating substances may be used alone or in combination of two or more.

A crosslinking aid (activator) may be used to properly carry out the crosslinking reaction. A metal oxide is used as a crosslinking assistant, and zinc oxide and zinc carbonate are particularly preferable.

The hardness of the thermoplastic elastomer composition of the present invention (the hardness of a rubber roller formed from the thermoplastic elastomer composition) is 50 or less, preferably 45 to 15, as measured by a type A hardness type according to JIS6301. And more preferably in the range of 40 to 20. If the hardness is greater than 50 in the shear A, the conveying force becomes insufficient when a rubber roller is used, and in particular, it becomes difficult to feed OHP paper. On the other hand, if the Shore A is smaller than 50, the rubber roller is sufficiently deformed even if the rubber roller is pressed against the paper or film with a relatively small pressing force, so that a large contact area with the paper or film can be obtained.

As described above, the thermoplastic elastomer composition of the present invention contains no oil or a very small amount of oil. Therefore, poor dispersion and rubber burn easily occur in a usual production method. . Accordingly, the present invention provides a method for producing the above-mentioned thermoplastic elastomer composition to which no or small amount of oil is added, wherein the rubber (A), the thermoplastic elastomer (B), the blend of the thermoplastic elastomer and the thermoplastic resin, the crosslinking agent Into a kneading machine, keeping the temperature below the melting point of the cross-linking agent until just before kneading, and raising the temperature above the melting point of the thermoplastic elastomer (B) during kneading to obtain a rubber (A) and a thermoplastic elastomer (B). Alternatively, a thermoplastic elastomer composition characterized by melting a thermoplastic elastomer, a thermoplastic resin, and a crosslinking agent, dynamically kneading the rubber (A) while kneading, and dispersing the rubber (A) in the thermoplastic elastomer (B). We provide a manufacturing method.

Specifically, the rubber (A) and the thermoplastic elastomer (B) or the blend of the thermoplastic elastomer (B) and the thermoplastic resin are simultaneously charged from the same input port of the kneader, The cross-linking agent is charged from another input port provided at a position immediately before kneading, and the inside of the kneader is kept at a temperature lower than the melting point of the cross-linking agent during the transportation, and is immediately higher than the melting point of the thermoplastic elastomer just before kneading. Heat up,
The rubber (A), the thermoplastic elastomer (B) or the thermoplastic elastomer and the thermoplastic resin, and the crosslinking agent are melted, and the rubber (A) is dynamically crosslinked while kneading, and dispersed in the thermoplastic elastomer (B). ing.

According to the present invention, a rubber roller is produced from the above-mentioned thermoplastic elastomer composition to which no or little oil is added.

The rubber roller of the present invention can be prepared, for example, by the following method. That is, the raw material kept at a temperature lower than the melting point of the crosslinking agent is charged into a rubber kneading device such as a twin screw extruder, an open roll, a Banbury mixer, and a kneader. The inlet for the cross-linking agent is separate from the other components, and the cross-linking agent is injected from the inlet provided immediately before kneading. According to this method, the problem that the temperature of the cross-linking agent rises to its melting point or higher during the transfer of the raw material and that the cross-linking agent adheres to the conveyed portion is solved. At the time of kneading, the temperature (160 ° C.)
(About 200 ° C.), and while the (A), (B) and the crosslinking agent are being melted almost simultaneously, the mixture is kneaded for about 1 to 20 minutes to dynamically crosslink the rubber and then extruded from a rubber kneading apparatus. The extruded kneaded rubber composition is pelletized, and the pellet is injection-molded by an injection molding machine to form a tube. After the surface of the molded product is polished, it is cut into required dimensions to form a rubber roller. Note that, instead of an injection molding machine, a rubber roller can be formed by extruding into a tube shape by a single screw extruder for resin and cutting the same.

The rubber roller is formed into a cylindrical shape and has a thickness of 1 mm to 8 mm, preferably 2 mm to 5 mm. Although this depends on the strength of the rubber roller, if the thickness is too small, it is difficult to form a large contact area with the paper even if the rubber roller is deformed. On the other hand, if the thickness is too large, the pressing force of the rubber roller against the paper must be increased in order to deform the roller, and the mechanism for pressing the rubber roller against the paper becomes large.

Since the rubber roller according to the present invention described above does not add oil or a small amount of oil, it can eliminate oil bleeding from the surface of the rubber roller. Coloring that occurs on the surface can be prevented.

[0031]

Embodiments of the present invention will be described below. The rubber roller for paper feeding of the present invention is formed into a cylindrical roller from a thermoplastic elastomer having the following composition, and the shaft center is pressed into the hollow portion, or both are fixed by bonding with an adhesive. .

The thermoplastic elastomer composition of the present embodiment comprises a resin cross-linking agent (a reactive phenolic resin (alkylphenol / formaldehyde resin), EPDM (A) cross-linked by the cross-linking agent, and hydrogen that is not cross-linked by the cross-linking agent. It comprises a mixture of an added styrene-based thermoplastic elastomer (B) and an olefin-based resin (polypropylene), and further contains zinc white as a crosslinking aid.

The rubber (A) and the thermoplastic elastomer (B) are compounded at a ratio of 4 ≧ B / A ≧ 1/4. In addition, the rubber (A) is dynamically cross-linked by a cross-linking agent and dispersed in the thermoplastic elastomer (B).

The above-mentioned thermoplastic elastomer composition has an acetone extractable% of 0% or more and 20% or less. The rubber is dynamically crosslinked with a crosslinking agent to disperse the rubber.

E used as a rubber crosslinked with the crosslinking agent
In PDM, when oil is added, process oil is added in a kneader.

The rubber roller of this embodiment is manufactured by the following method. EPDM from the same inlet of the kneader
Rubber, hydrogenated styrene-based thermoplastic elastomer, and polypropylene are simultaneously charged and conveyed to the kneading section, and a cross-linking agent and a cross-linking aid are charged through another inlet provided immediately before the kneading section. Up to the kneading part, 40 to 100 below the melting point of the crosslinking agent
C. and heated at a temperature of 160.degree. C. to 200.degree. C. in the kneading section to melt the EPDM rubber, the hydrogenated styrene-based thermoplastic elastomer, the polypropylene and the crosslinking agent almost simultaneously.

In this state, the rubber is kneaded for 1 to 20 minutes to dynamically crosslink the rubber and disperse it in the thermoplastic elastomer.
Extrude. Next, the extruded kneaded rubber composition was pelletized, and the pellet was injection-molded by an injection molding machine to form a tube. Then, after polishing the surface of the tube, the tube was cut and the outer diameter was 32 mm and the inner diameter was 28 m.
m and a roller having a width of 15 mm were prepared.

[0038]

EXAMPLES As shown in Table 1 below, for Examples 1 to 5 and Comparative Examples, the compositions having the compositions shown in the table were extruded, pelletized, injection molded into a roller shape (circular tube), and then cut. OD 32mm, ID 28mm, width 1
A 5 mm roller was produced.

[0039]

[Table 1]

The numerical unit of each composition in the table is parts by weight.
The abbreviation E505A represents EPDM (Esprene 505A manufactured by Sumitomo Chemical Co., Ltd.). In Example 1, no oil was added. In addition, oil was added by a kneader. Rubber or elastomer 1
It is indicated in parts by weight relative to 00 parts by weight. As this oil, paraffin oil (Diana Process Oil Pw-380 manufactured by Idemitsu Kosan Co., Ltd.) was used. (Note: Is this also the softener added to the elastomer?) In the table, Septon 2063 represents a hydrogenated styrene elastomer manufactured by Kuraray Co., Ltd. And PP means Novatec PP BC6 manufactured by Nippon Polychem.

In addition to the formulations shown in the table, as a crosslinking agent, a reactive phenol resin (Takkirol 25 manufactured by Taoka Chemical Co., Ltd.)
0-III) 12 parts by weight and 5 parts by weight of zinc flower (Zinc flower No. 1 manufactured by Mitsui Mining & Smelting Co., Ltd.) as a crosslinking aid were commonly used in the formulations of Examples and Comparative Examples.

The rubber roller was prepared as follows.
EPD to twin screw extruder HTM38 (manufactured by IBEC)
M rubber, a hydrogenated styrene-based thermoplastic elastomer, and other additives were transported to just before the kneading portion while maintaining the temperature at 40 to 100 ° C., and a crosslinking agent and a crosslinking assistant were added just before the kneading portion. After the charging, the rubber was kneaded for 1 to 20 minutes while heating at a temperature of 160 ° C to 200 ° C to dynamically crosslink the rubber and then extruded. Next, the extruded kneaded rubber composition was pelletized, and the pellet was injection-molded by an injection molding machine to form a tube. Then, after polishing the surface of the tube, the tube was cut and the outer diameter was 32 mm and the inner diameter was 28 m.
A D cut roller having a width of 15 mm and a width of 15 mm was prepared.

[Examples 1 to 5] In Examples 1 to 4, a cross-linking agent (reactive phenol resin), a rubber (EDPM) cross-linked by the cross-linking agent (A), and a cross-linking agent (B) were used. Thermoplastic elastomer that is not cross-linked by a cross-linking agent (Septon 206
3) are blended in a ratio of 4 ≧ B / A ≧ 1/4. In Examples 5 and 6, the cross-linking agent and the above (A)
And a thermoplastic elastomer (Septon 2063) and a thermoplastic resin (PP) which are not crosslinked by a crosslinking agent.
It is blended at a ratio of 4 ≧ B / A ≧ 1/4. In each of Examples 1 to 5, the acetone extractables% was
It was 0% or more and 20% or less. On the other hand, in Comparative Example, the amount of oil added was 23%, and the acetone extractables% was larger than 20%.

The rubber rollers of Examples 1 to 5 and Comparative Example were tested and evaluated for OHP sheet feeding performance and presence / absence of roller marks.

(OHP Paper Feeding Test) The paper feeding roller composed of the rubber roller of each Example and Comparative Example was mounted on an actual machine (Seiko Epson Inkjet Printer PM-770C) under the conditions of 23 ° C. and 55% relative humidity.
Paper (Seiko Epson OHP sheet for inkjet printer) was set in the feeder, a print command was issued, and the paper feed roller was rotated to start feeding the paper.
Repeat 10 passes for each roller 10 times, OHP
The paper feeding status was observed.

(Roller Mark Evaluation Test) The presence or absence of roller marks was tested by the following method. After the surfaces of the rubber rollers of the examples and the comparative examples were wiped with alcohol, the rubber rollers were left in an oven at 60 ° C. overnight. The paper feed roller composed of the rubber roller of each of the examples and the comparative example after leaving was left at 23 ° C. and a relative humidity of 55%.
Under the conditions described above, attached to an actual machine (Seiko Epson Inkjet Printer PM-770C) and OHP paper (Seiko Epson Inkjet Printer O
HP sheet) was set on the feeder, and green halftone was printed. At this time, the presence or absence of color loss at the roller contact portion was visually determined, and the following three-stage evaluation was performed.

A: No color loss. ：: Color omission is not conspicuous. X: Omission of color.

In the rubber roller of the comparative example having an acetone extractable content of more than 20%, color omission occurred in the above roller mark evaluation test.

On the other hand, 0% and 5%
The rubber rollers of Examples 1 and 2 were very excellent rubber rollers having no color omission in the above roller mark evaluation test, good OHP feed, and excellent OHP feed. The rubber rollers of Examples 3, 4 and 5 were excellent rollers that had no noticeable color loss and good OHP feed in the above-mentioned roller mark evaluation test, and were sufficiently practical.

[0050]

As is apparent from the above description, according to the present invention, a thermoplastic elastomer composition having low hardness and excellent heat resistance can be obtained, although no oil is added or a small amount is added. The rubber roller made of the above thermoplastic elastomer composition is extremely useful for an injection printer or the like that needs to pick up and separate a conveyed object such as paper or film and feed the paper while separating the paper. ,
When printing on photo print paper or color OHP paper, no oil is added or only a small amount is added, so that oil does not bleed on the roller surface, thereby preventing color loss due to oil. Further, the hardness of the rubber roller can be reduced to a share A50 or less, and the rubber roller has an advantage that color omission is prevented and excellent in transport of OHP paper.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 101/00 C08L 101/00 F term (Reference) 3F049 AA01 CA16 LA02 LA05 LA07 4F070 FA01 FB06 FB07 FC05 GA08 GB02 GB08 GB09 GB10 GC03 4J002 AC01W AC02W AC03W AC07W AC08W AC09W BB03Y BB12Y BB15W BB18W BB24X BC03Y BC05X BG04W BP01X CC03Z CF06Y CF07Y CL00Y FD14Z GM00

Claims (5)

[Claims] 1. A cross-linking agent, a rubber (A) cross-linked by the cross-linking agent, a thermoplastic elastomer (B) not cross-linked by a cross-linking agent, or a thermoplastic elastomer (B) not cross-linked by a cross-linking agent and a thermoplastic resin A blend is blended with (A) and (B) at a ratio of 4 ≧ B / A ≧ 1/4, and the rubber (A) is dynamically cross-linked with the cross-linking agent to form the thermoplastic elastomer ( B) a thermoplastic elastomer composition dispersed in the composition, wherein the composition does not contain an oil-based softening agent or contains a small amount of a softening agent, and the acetone-extractable% of the composition is 0%. A thermoplastic elastomer composition characterized by being set to not less than 20%. 2. The method for producing a thermoplastic elastomer composition according to claim 1, wherein the rubber (A), the thermoplastic elastomer (B), a blend of the thermoplastic elastomer and the thermoplastic resin, and a crosslinking agent are kneaded. The temperature is kept below the melting point of the crosslinking agent just before kneading, and the temperature is raised to above the melting point of the thermoplastic elastomer (B) during kneading, and the rubber (A), thermoplastic elastomer (B) or thermoplastic A method for producing a thermoplastic elastomer composition, comprising melting an elastomer, a thermoplastic resin, and a crosslinking agent, dynamically kneading the rubber (A) while kneading, and dispersing the rubber (A) in the thermoplastic elastomer (B). 3. The rubber (A) and the thermoplastic elastomer (B) or the blend of the thermoplastic elastomer (B) and the thermoplastic resin are simultaneously charged from the same inlet of the kneading machine and the cross-linking is performed. The agent is introduced from another inlet provided immediately before kneading, and the inside of the kneader is kept at a temperature lower than the melting point of the cross-linking agent during the transportation, and immediately before kneading, the temperature is raised to the melting point of the thermoplastic elastomer or higher. The method for producing a thermoplastic elastomer composition according to claim 2, wherein 4. A rubber roller obtained by molding the thermoplastic elastomer composition according to claim 1 into a roller shape. 5. The rubber roller according to claim 4, wherein the hardness is 50 or less in Shore A.