JPH08334939A - Rubber composition for roll - Google Patents

Abstract

PURPOSE: To prevent the blooming of rubber after vulcanization and to maintain durability over a long period of time by adding a vulcanizing agent made of a peroxide to ethylene-propylene copolymerized rubber in a specified ratio. CONSTITUTION: A vulcanizing agent. made of a peroxide is added by 3-6 pts.wt., preferably 3.2-4.0 pts.wt. to 100 pts.wt. ethylene-propylene copolymer for a paper feeding roll or a conveying roll. The amt. of the peroxide to be added is calculated by considering the purity of the peroxide to be 100%, and if the purity of the peroxide is 40%, the peroxide is added by 7.5-15 pts.wt., preferably 8-10 pts.wt. An ethylene-propylene-unconjugated diene terpolymer obtd. by introducing unconjugated diene as a 3rd component having unsaid. bonds into the ethylene- propylene copolymer may be used in place of the copolymer and the 3rd component is, e.g. dicyclopentadiene.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed roller and a paper carrying roller in an electronic copying machine, a laser beam printer (hereinafter abbreviated as LBP), or the like.

[0002]

2. Description of the Related Art Conventionally, a paper feed roller and a paper conveying roller in an electronic copying machine or an LBP are required to have a high dynamic friction coefficient so that stable conveyance can be obtained, and a contact area between the paper or the like and a rubber roller needs to be taken. Therefore, a polynorbornene rubber composition having a hardness of about 25 degrees (JIS A hardness meter) is usually employed.

However, this polynorbornene rubber is inferior in weather resistance and ozone resistance, and further, abrasion is increased by feeding paper of about 100,000 sheets or more, so that it has a drawback that stable transportability cannot be obtained for a long period of time. Was.

Therefore, recently, in order to improve weather resistance and abrasion resistance, a rubber composition containing an ethylene-propylene copolymer as a main component as disclosed in JP-A-6-41324 is used as a paper feed roller. It is being used as a carrier roller.

[0005]

However, in the conventional ethylene-propylene copolymer composition, particularly the sulfur vulcanization composition, since the bloom after rubber vulcanization is large, the initial reduction of the dynamic friction coefficient is remarkable. It has a drawback that the transportability as a roller is deteriorated.

[0006]

In order to solve the above-mentioned conventional problems, the present invention provides an ethylene-propylene copolymer 1
A rubber composition for a roller is proposed in which 3 to 6 parts by weight of a vulcanizing agent composed of a peroxide is added to 100 parts by weight.

[0007]

A vulcanizing agent composed of a peroxide is added in an amount of 3 to 6 parts by weight, preferably 3.2 to 4.0 parts by weight, based on 100 parts by weight of an ethylene-propylene copolymer as a paper feeding roller or a conveying roller. By doing so, it is possible to provide a rubber composition for a paper feed roller and a conveyance roller that has no bloom after rubber vulcanization and has long-term durability.

[0008]

EXAMPLE A rubber composition for a roller of the present invention was prepared by using ethylene-
3 to 6 parts by weight of a vulcanizing agent made of a peroxide is added to 100 parts by weight of propylene copolymer rubber.

The ethylene-propylene copolymer in the present invention is an ethylene-propylene copolymer (hereinafter abbreviated as EPM) or an ethylene-propylene-non-donor compound in which a non-capping diene is introduced as a third component having an unsaturated bond. A diene terpolymer (hereinafter abbreviated as EPDM).
Examples of the third component include dicyclopentadiene, dicyclooctadiene, 5-methylene-2-norbornene, 5-ethylidene-2-norbornene, and 1,4-hexadiene.

As a concrete grade, Mitsui EPT00
45,1035,1045,1060,1070,1071,3012P, 3045,3042E, 3062
E, 3070,3072E, 3090E, 8075E, 3091,3095,4010,4021,4045,
4070,4095 (above, Mitsui Petrochemical Industry Co., Ltd. product name), Esplen 201,301,301A,

305,400,501A, 502,505,505A, 512F, 514,52
2,524,532,553,567,600F, 601,606 (above, trade name of Sumitomo Chemical Co., Ltd.), JSREP912P, EP01P, EP02P, EP9
41P, EP961SP, EP07P, EP57P, EP181SP, EP11, EP43, EP93, EP2
4, EP27, EP21, EP132, EP22, EP25, EP33, EP35, EP37C / F, EP6
5, EP51, EP57C / F, EP75F, EP86, EP96, EP98, EP103AF, EP106E
F, EP107F, EP801E, EP001DE (Nippon Synthetic Rubber Co., Ltd. product name), Keltan 520,720,820,312,512,712,812,
314,514,714,378,578,778,4502,4802,4778,4703,4903,5
631A, 512 × 50,708 × 15,509 × 100 (above, trade name of Idemitsu DSM Co., Ltd.), NORDEL1040,1070,11
45,1320,1440,1470,1660,2522,2722 / P, 2744 / P, 2760 / P
(These are product names of Dupont (USA)), EPSYN40-
A, 70-A, 55,2308,2506,4506,4906,5206,5508,5808,7506,
E801, P557, P558, P597, MDE239, MDE248 (above, Copolymer
Rubber & Chemical Corporation (USA) product name), POLYSAR227,306,345,585,847 × P, 865,96
5,5465,5672X, 5875,6463 (above, PolysarRubberCorpor
ation (USA) product name) and the like.

In the present invention, these EPMs or EPs are used.
DM may be used alone, or may be used for the purpose of adjusting Mooney viscosity, propylene content, oil-extended oil amount, vulcanization rate, etc.
More than one type of EPM or EPDM may be blended at appropriate times, or other rubber types such as SBR may be blended.

In the present invention, EPM or EPD
It is important to add 3 to 6 parts by weight of peroxide as a vulcanizing agent to 100 parts by weight of M.

In the case of a normal EPDM composition, sufficient crosslinking can be obtained with less than 3 parts by weight of peroxide, but the hardness of the conveying roller, particularly the feeding roller is 25 degrees (JIS.
Since a composition having a hardness as low as A hardness meter) is used, 5
A large amount of a softening agent of about 0 to 130 parts by weight is mixed.

Therefore, because some peroxide is dissolved in the softening agent, sufficient crosslinking cannot be obtained with an amount of the peroxide less than 3 parts by weight, and permanent elongation becomes large and compression set deteriorates. There are problems that the workability is poor, the shape stability of the product size is poor, and the life is short.

Then, as a result of diligent examination of the proper amount of the vulcanizing agent composed of a peroxide in the case of blending a large amount of the softening agent with the EPM or EPDM, 3 to 6 parts by weight of the peroxide was added to 100 parts by weight of the EPM or EPDM. It has been found that sufficient cross-linking can be obtained when the amount is preferably 3.2 to 4.0 parts by weight, and the present invention has been completed.

The amount of peroxide added here is an amount calculated assuming that the purity of the peroxide is 100%.

In consideration of storage stability and dispersibility, ordinary peroxide for rubber is a mixture containing calcium carbonate as a binder and diluted to about 40%.

Therefore, for example, if the purity of the peroxide is 40%, the proper amount is 7.5 to 15 parts by weight, preferably 8 to.
The range is 10 parts by weight.

The peroxide used in the present invention is not particularly limited, and any one applicable to ordinary peroxide vulcanization can be used.

This peroxide contains Perhexa 3M as a peroxyketal (trade name: 90, manufactured by NOF CORPORATION).
% Product), Perhexa 3M-40 (trade name, manufactured by NOF CORPORATION; 40% product), Trigonox 29A (trade name, manufactured by Kayaku Akzo Co., Ltd., 90% product), Trigonox 29-
40 (product name manufactured by Kayaku Akzo Co., Ltd .; 40% product), Sampelox CY-11 (product name manufactured by Sanken Kako Co., Ltd .; 9)
5% product), Ruparco 231XL (trade name of Lucidol Yoshitomi Co., Ltd .; 40% product), Varox 231XL (RT
Vanderbilt (USA) product name; 40% product) 1,1
1,1-bis (t-butylperoxy) cyclohexane, perhexa such as -bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, Perhexa C (trade name of NOF CORPORATION, 70% product) 2,2-bis (t-butylperoxy) octane, Perhexa V such as ◯ (Nippon Oil & Fat Co., Ltd. product name; 70% product), Perhexa -40 (Nippon Yushi Co., Ltd. product name; 40% product)
(Nippon Yushi Co., Ltd. product name; 90% product), Perhexa V-40 (Nippon Yushi Co., Ltd. product name; 40% product), Trigonox 17-40 (Kayaku Akzo Co., Ltd. product name; 40% product) N-butyl-4,4-bis (t-
1,1-bis (t-butylperoxy) cyclododecane such as butylperoxy) valerate and Perhexa CD (trade name; manufactured by NOF Corporation; 98% product); perbutyl D (produced by NOF Corporation) as a dialkyl peroxide. Product name; 98% product), Kayabutyl D (product name: Kayaku Akzo Co., Ltd. product name: 97% product), San Perox DT (Sanken Kako Co., Ltd. product name: 98% product) Oxide, Perbutyl C (trade name, manufactured by NOF Corporation; 90% product) Kayabutyl C (trade name, manufactured by Kayaku Akzo Co., Ltd .; 90% product), Sampelox CT (trade name, manufactured by Sanken Kako Co., Ltd., 90% product) ) Such as t-butyl cumyl peroxide, Park Mill D (trade name, manufactured by NOF Corporation; 99% product), Park Mill D-40 (trade name, manufactured by NOF Corporation, 4) % Product), Kayakumiru D (tradename, manufactured by Akzo Chemicals Inc., 97% product), Kayakumiru D-40
(Kayaku Akzo Co., Ltd. product name; 40% product), Mitsui DC
P (Mitsui Petrochemical Co., Ltd. product name; 98% product), Sampelox DCP-98 (Sanken Chemical Co., Ltd. product name;
98% product), Luperox 500-40C (trade name of Lucidol Yoshitomi Co., Ltd .; 40% product), DI-Cup40
C, Di-Cup40KE (trade name of Hercules Inc. (USA); 40%), VaroxDCP-40C (RTVan
derbilt (USA) product name; 40% product) such as dicumyl peroxide, perbutyl P (NOF Corporation product name: 95% product), Peroximon F-40 (NOF product name: 40%) Product), Perkadox 14 (product name manufactured by Kayaku Akzo Co., Ltd .; 96%), Perkadox 14-40 (product name manufactured by Kayaku Akzo Co., Ltd .; 40%)
Products), Sampelox TY-13 (product name manufactured by Sanken Kako Co., Ltd .; 98% product), Ruperco 802XL (product name manufactured by Lucidol Yoshitomi Co., Ltd .; 40% product), Vul-Cup4
0KE (Hercules Inc. (USA) product name; 40%),
Varox VC-40KE (RTVanderbilt (USA)
Α, α'-bis (t-butylperoxy-m-isopropyl) benzene, such as manufactured trade name; 40% product), Perhexa 25B (trade name; manufactured by NOF CORPORATION; 90% product), Perhexa 25B-40 ( Product name of Nippon Oil & Fat Co., Ltd .; 4
0% product), Kayahexa AD (product name manufactured by Kayaku Akzo Co., Ltd .; 90% product), Kayahexa AD-40 (product name manufactured by Kayaku Akzo Co., Ltd .; 40% product), Rupaco 101-XL
(Lucidol Yoshitomi Co., Ltd. product name; 45% product), Va
2,5-dimethyl-2,5-di (t-butylperoxy) hexane, perhexin 25 such as roxDBPH-50 (trade name, manufactured by RTVanderbilt (USA); 45% product)
B (Nippon Yushi Co., Ltd. product name; 90% product), Perhexin 25B-40 (Nippon Yushi Co., Ltd. product name; 40%)
Products), Kayahexa YD (trade name, manufactured by Kayaku Akzo Co., Ltd .;
90% product), Kayahexa YD-50 (product name manufactured by Kayaku Akzo Co., Ltd .; 50% product), Sampelox YPO (product name manufactured by Sanken Kako Co., Ltd .; 90% product), Ruperco 130X
2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3 such as L (Lucidol Yoshitomi Co., Ltd. product name; 45% product), perbutyl as a peroxyester (made by NOF Corporation) Product name: 97% product), Kayaester ○ (Kayaku Akzo Co., Ltd. product name: 97% product),
Sampelox TO (Product name of Sanken Kako Co., Ltd .; 97
% Product), lupazole PDO (trade name of Lucidol Yoshitomi Co., Ltd .; 97% product), such as t-butylperoxy-2-
T-Butylperoxy 3,5,5-such as ethylhexanoate, perbutyl 355 (trade name, manufactured by NOF CORPORATION; 97% product), and Trigonox 42 (trade name, manufactured by Kayaku Akzo Co., Ltd .; 94% product). Trimethyl hexaate, Perhexa 25Z (Nippon Yushi Co., Ltd. product name; 90%
2,5-Dimethyl-, such as Sanpelocs APB (product name manufactured by Sanken Kako Co., Ltd .; 90% product) and Perox 118 (product name manufactured by Lucidol Yoshitomi Co., Ltd .; 90% product).
2,5-di (benzoylperoxy) hexane, perbutyl I (trade name, manufactured by NOF CORPORATION; 95% product), Kayacarvone BIC-75 (trade name, manufactured by Kayaku Akzo Co., Ltd .;
75% product), Lupasol TBIC-M75 (trade name of Lucidol Yoshitomi Co., Ltd .; 75% product), and t-butylperoxyisopropyl carbonate.

Further, for the purpose of improving dispersibility in the polymer and preventing scattering, a peroxide masterbatch based on EPT or the like may be used. For this, Trigonox 29-40 MBGR (manufactured by Kayaku Akzo Co., Ltd.) may be used. Product name;
1,1-bis (t-butylperoxy) 3,5,5-trimethylcyclohexane (40% product), Trigonox 17-40MBGR (trade name of Kayaku Akzo Co., Ltd .; n
-Butyl-4,4-bis (t-butylperoxy) valerate 40%), Perkadox BC-40MBG
R (trade name, manufactured by Kayaku Akzo Co., Ltd .; 40% of dicumyl peroxide), Percadox 14-40 MBGR
(Trade name manufactured by Kayaku Akzo Co., Ltd .; α, α'-bis (t-
40 of butylperoxy-m-isopropyl) benzene
% Product), Trigonox 101-40MDGR (trade name manufactured by Kayaku Akzo Co., Ltd .; 40% product of 2,5-dimethyl-2,5-di (t-butylperoxy) hexane), and the like.

As the vulcanizing agent, α, α'-bis (t-
Butyl peroxy-m-isopropylbenzene) may induce bloom, so if 0.5 to 1 part by weight of polyethylene glycol such as PEG4000S (trade name of Sanyo Kasei Co., Ltd.) is used together. Good.

Since the present invention is based on peroxide vulcanization, 0.5% of a suitable co-crosslinking agent is used for the purpose of improving physical properties and vulcanization rate.
It can be used up to about 5 parts by weight, and it contains fine gold sulfur (150mesh, 200mesh, 300mesh, 325me).
sh), Salfax A, 200S, MC, PS, PM
C (above, product name manufactured by Tsurumi Chemical Industry Co., Ltd.), Seyimi Sulfur (product name manufactured by Nippon Dry Storage Industry Co., Ltd.), Sanfer, Sanfer 90 (above, product name manufactured by Sanshin Chemical Industry Co., Ltd.)
Sulfur (S) such as, Glycidyl Methacrylate (GMA) such as Bremmer G (trade name of NOF CORPORATION),
Maleic anhydride (MA) such as Crystalman (trade name of NOF Corporation), zinc oxide (ZnO) such as Zinc Hua No. 1 (trade name of Sakai Chemical Industry Co., Ltd.), Actor PB
N such as MR (trade name of Kawaguchi Chemical Industry Co., Ltd.)
N-m-phenylene bismaleimide, p-quinonedioxime (GM) such as Actor Q (Kawaguchi Chemical Co., Ltd.), p, p 'such as Actor DQ (Kawaguchi Chemical Co., Ltd.) 2-Mercaptobenzothiazole (MB such as dibenzoylquinone dioxime (DGM) and Axel M (trade name, manufactured by Kawaguchi Chemical Industry Co., Ltd.)
T), Axel DM (trade name of Kawaguchi Chemical Industry Co., Ltd.)
Dibenzdiazole disulfite (MBTS), such as
Tetramethylthiuram disulfite (TMTD) such as Accel TMT (trade name of Kawaguchi Chemical Industry Co., Ltd.),
N-oxydiethylene-2-benzothiazole sulfanamide (OBS) such as Actor NS (Kawaguchi Chemical Co., Ltd.), N-cyclohexylbenzothiazole sulfone such as Axel CZ (Kawaguchi Chemical Co., Ltd.) 1,2-Polybutadiene (1,2PB) such as fanamide (CBS), NissoPB (trade name manufactured by Nippon Soda Co., Ltd.), and polyethylene glycol dimethacrylate (PEGDM) such as Blemmer PDE-100 (trade name manufactured by NOF CORPORATION) ), Diallyl phthalate (DAP), triallyl isocyanurate (TAIC) such as Tayk (trade name of Nippon Kasei Co., Ltd.), triallyl cyanurate (TAC) such as tack (trade name of Musashino Chemical Laboratory Co., Ltd.), Acryester THF (manufactured by Mitsubishi Rayon Co., Ltd. Name) of such tetrahydrofurfuryl methacrylate (THFMA), San ester EG
(Product name of Sanshin Chemical Industry Co., Ltd.) and Acryester E
Ethylene dimethacrylate (EDMA) such as D (trade name manufactured by Mitsubishi Rayon Co., Ltd.), Dimethacrylic acid 1, such as Acryester BD (trade name manufactured by Mitsubishi Rayon Co., Ltd.)
3-butylene (BDMA), sunester TMPMA
(Product name of Sanshin Chemical Industry Co., Ltd.) and Acryester T
MP (product name manufactured by Mitsubishi Rayon Co., Ltd.) and Highcross M
An example is trimethylolpropane trimethacrylate (TMPMA) such as (trade name of Seiko Chemical Co., Ltd.).

The softening agent or plasticizer used in the present invention is not particularly limited, but in order to obtain a composition having a low hardness, 30 to 30 parts by weight of EPDM is used.
Since it is necessary to add a large amount of 200 parts by weight, preferably about 50 to 130 parts by weight, it is necessary to consider compatibility with rubber.

Therefore, paraffin oil, naphthene oil, aromatic oil and the like are preferably used, and as the paraffin oil, Diana Process Oil PW-3 is used.
2, PW-90, PW-150, PW-380, PS-
32, PS-90, PS-430, PX-32, PX-
90 (above, product name manufactured by Idemitsu Kosan Co., Ltd.), Stanol 40, 43N, 52, 69, 149, LP40, LP6
9, Flexon 845 (above, trade name manufactured by Esso Oil Co., Ltd.), SYNTAC PA-95, PA-100, PA-
140 (above, trade name manufactured by Kobe Oil Chemical Co., Ltd.), Cosmo Process 10, 40, 40C (above, trade name manufactured by Cosmo Oil Co., Ltd.), LUBFLEX 26, 100, 40
0 (above, trade name of Shell Japan Co., Ltd.), Kyoseki Process P-200, P-300, P-500 (above, trade name of Nikko Kyoseki Co., Ltd.), Sunper 11
0,115,120,130,150,180,210
0,2210,2280 (above, trade name of Nippon Sun Oil Co., Ltd.), FUKKOR P-200, P-400, P
-500 (Fuji Kosan Co., Ltd. product name), Mitsubishi 1
0, Mitsubishi 12 (above, trade name of Mitsubishi Oil Co., Ltd.) and the like.

As the naphthenic oil, Diana process oil NS-24, NS-100, NM-2
6, NM-68, NM-150, NM-280, NP-
24, NU-80, NF-90 (above, trade name of Idemitsu Kosan Co., Ltd.), Esso Process Oil 725, 765
(These are product names of Esso Oil Co., Ltd.), SYNTAC N
-40, N-60, N-70, N-75, N-85 (above, trade name of Kobe Oil Chemicals Co., Ltd.), Shelf Rex 371JY, 371N, 451, N-40, 22,
22R, 32R, 100R, 100S, 100SA, 2
20RS, 220S, 260, 320R, 680 (above, trade name manufactured by Shell Japan Co., Ltd.), Kyoseki Process R-50, R-200, R-1000 (trade name manufactured by Nikko Kyoseki Co., Ltd.), Sunthene 310, 380,
410, 415, 420, 430, 450, 480, 3
215, 4130, 4240, Ciro Light RPO (above, product name manufactured by Japan Sun Oil Co., Ltd.), Komorex No. 2 (product name manufactured by Nippon Oil Co., Ltd.), Fuccol 11
50N, 1400N (Fuji Kosan Co., Ltd. product name), Mitsubishi 20 (Mitsubishi Petroleum Co., Ltd. product name), Naplex 32, 38 (Mobil Petroleum Co., Ltd. product name), Petrex PN-3 ( Yamabun Yuka Co., Ltd. product name) etc. are illustrated. As the aromatic oil, Diana process oil AC-12, AC-460, AE-
24, AE-50, AE-200, AH-16, AH-
58 (above, product name manufactured by Idemitsu Kosan Co., Ltd.), Esso Process Oil 110, 120 (above, product name manufactured by Esso Oil Co., Ltd.), SYNTAC HA-10, HA-15, HA
-30, HA-35 (above, product name manufactured by Kobe Oil Chemical Co., Ltd.), Cosmo Process 40A (product name manufactured by Cosmo Oil Co., Ltd.), Dutrex 729UK, 739 (product name manufactured by Shell Japan Co., Ltd.), Kyoseki Process X100-A, X100 (above, product name manufactured by Nikko Kyoseki Co., Ltd.), JSO Aroma 790 (product name manufactured by Nippon San Oil Co., Ltd.), Komorex 300, 700 (product name manufactured by Nippon Oil Co., Ltd.) , Alomax # 1,
# 3, # 5 (Fuji Kosan Co., Ltd. product name) Heavy Process Oil Mitsubishi 34, Mitsubishi 38, Mitsubishi 44 (or Mitsubishi Oil Co., Ltd. product name), Mobilsol K, 2
2,30,130 (above, trade name of Mobil Oil Co., Ltd.), Petrex LPO-R, LPO-V, PF-
1, PF-2 (above, product name manufactured by Yamabun Yuka Co., Ltd.) and the like.

As the plasticizer, di- (2-ethylhexyl) such as Vinizerizer 80 (trade name, manufactured by Kao Corporation) is used.
Phthalate (DOP), Leo Flex 9P (trade name of Shell Japan Co., Ltd.) and Diasizer 11,99
(Above, product name of Mitsubishi Kasei Vinyl Co., Ltd.), higher alcohol / phthalate, DIOP (Wacker-Chemie
(German) trade name, such as diisooctyl phthalate (DIOP), Sansocizer DOS (trade name of Shin Nippon Rika Co., Ltd.) sebacate, Alizona 208 (Alizona Chem (USA))
(Trade name) such as isooctyl tall oil fatty acid ester, TBP (trade name of Daihachi Chemical Industry Co., Ltd.) such as triethyl phosphate (TBP), TBEP (trade name of Daihachi Chemical Industry Co., Ltd.) Butoxyethyl phosphate (TBEP), Sansoizer TCP
Tricresyl, such as (New Nippon Rika Co., Ltd. product name)
Cresyl diphenicle phosphate (CDP) such as phosphate (TCP) and CDP (trade name of Daihachi Chemical Industry Co., Ltd.), Koremoll CE 542
2 (trade name of BASF (Germany)) and the like.

One or two kinds of these softening agents and plasticizers are usually used at appropriate times. Also, black sub, white sub, candy sub,
Subs (factis) such as golden factice, neo factice, and sulfur-free factice (above, product name of Tenma Sub Chemical Co., Ltd.) can also be used together.

In the present invention, in order to obtain a moderately high-strength vulcanized product, 0 to 200 parts by weight, preferably 10 to 130 parts by weight, of the reinforcing filler is added to 100 parts by weight of the base rubber.

Carbon black is generally used as a reinforcing filler, and HAF carbon (A, such as Show Black N330 (trade name of Showa Cabot Co., Ltd.)).
STM N330), MASF carbon such as SEAST 116 (trade name of Tokai Carbon Co., Ltd.), FEF carbon (A trade name of Asahi # 60 (trade name of Asahi Carbon Co., Ltd.)
STM N550), Asahi # 55 (trade name of Asahi Carbon Co., Ltd.) GPF carbon (ASTM N66
0), SRF carbon (ASTM N774) such as Asahi # 50 (trade name of Asahi Carbon Co., Ltd.), Asahi Thermal (trade name of Asahi Carbon Co., Ltd.) and HTC # 20 (trade name of Chubu Carbon Co., Ltd.) FT carbon (AS
TM N990), and the like.

In addition to carbon black, an inorganic reinforcing material may be used alone or in combination as a reinforcing filler. For this, Aerosil 130, 200, 300, 380, OX is used.
50, TT600, MOX80, MOX170, COX
84, R972, R974 (above, trade name of Nippon Aerosil Co., Ltd.), Reorosil QS13, QS30, Q
Dry silica such as S38, QS102 (above, trade name of Tokuyama Corporation), Carplex # 67, # 8
0, # 100, # 1120, XR, 22S, CS-5
CS-7 (above, Shionogi Pharmaceutical Co., Ltd. product name), Shilton A, R-2 (above, Mizusawa Chemical Co., Ltd. product name), Tokusil AL-1, Gu, U, UR, US (above, stocks) Company Tokuyama product name), Nipseal AQ,
ER, LP, NA, NP, NS-K, VN-3 (above,
Product name of Nippon Silica Co., Ltd., Ultrasil V
N3 (trade name of Degussa (Germany)), Hi-Sil233
Wet silica such as (PPG Industries (US) product name), activated luster flower CC, DD, O, U (above, Shiraishi Kogyo Co., Ltd. product name) activated calcium carbonate, white luster A,
Special calcium carbonate such as AA (trade name manufactured by Shiraishi Industry Co., Ltd.), magnesium silicate such as Mistron Paper (trade name manufactured by Nippon Mistron Co., Ltd.), Hytron, Hytron A, Microlite, US-10
0, US-150S, US-150SS, Hirac,
Magnesium silicate, such as Hirac SS (Takehara Chemical Industry Co., Ltd. product name), Wiener Clay A
(Hard clay; trade name manufactured by Kawashige Co., Ltd.), hard clay, soft clay, crown clay (above, trade name manufactured by Shiraishi Calcium Co., Ltd.), silcanite, NN
Clay, Special Kaolin Clay, Hard Bright, No. 5 Clay, SPMA Clay, Union Clay RC
-1, Glomax Max LL, Hydrite PX (above, Takehara Chemical Industry Co., Ltd. product name), JP-100 Kaolin, 5M Kaolin, NN Kaolin, Hardsil, ST Kaolin, Cartabo (above, Tsuchiya Kaolin Industry Co., Ltd. product name ) Such as clay (aluminum silicate), ST-
100, ST-200, ST-301 (above, trade name of Shiraishi Calcium Co., Ltd.), Nurok321, Nuc
ap100, Nucap190, Nucap200, N
ucap390 (above, trade name of JM Huber (USA)), Burgess KE, CB, 5178, 221
Silane-modified clay such as No. 1 (above, trade name of Burgess Pigment (USA)) is exemplified.

Further, in the present invention, for the purpose of dimensional stability and low price, it is 5 to 20 with respect to 100 parts by weight of the base rubber.
0 parts by weight, preferably of the order of 10 to 100 parts by weight, of an extender filler may be added, which may be Green Ba.
ll (trade name of Inoue Lime Industry Co., Ltd.), Tamapearl T
P-121, TP-121R, TP-222H, TP-
222HS, TP-123, TP-123CS (above,
Okutama Kogyo Co., Ltd.), light calcium carbonate such as Silver W (Shiroishi Kogyo Co., Ltd.), Whiten SSB, SB, B (above, Shiraishi Calcium Co., Ltd. trade name), Sunlight # 100, # 300, # 70
0, # 800, # 1000, # 1500, # 2000,
# 2200, # 2500 (above, trade name of Takehara Chemical Industry Co., Ltd.), NS # 100, NS # 200, NS # 40
0, NS # 600, NS # 1000, NS # 2300,
NS # 2500, NS # 2700, NS # 3000, S
S # 30, SS # 80, NN # 200, NN # 500
(These are product names of Nitto Koka Kogyo Co., Ltd.), Super S, SS, SSS, 4S, # 1500, # 1700, #
Heavy calcium carbonate such as 2000 (above, product name manufactured by Maruo Calcium Co., Ltd.), JET-S (product name manufactured by Asada Milling Co., Ltd.), talc GTA, CTA1, CTA2, fine powder talc (all products manufactured by Kunimine Industry Co., Ltd.) Name), M
S, MS-P, MS-A, ND, SW, SW-E, SW
Talc (talc) such as A, SWB, SSS, SS, S (above, product name of Nippon Talc Co., Ltd.), Crystallite AA, VX-S, VX-S-2, VX-SR (above, Ryu Corporation) Mori product name), Min-U-Sil 5,1
0, 15, 30 (above, trade name of US Silica Co. (USA)), Imsil A-10, A-15, A-25, A
-108 (above, trade name manufactured by Illinois Minerals (USA)), JA-30W, 325M (above trade name manufactured by Asada Milling Co., Ltd.), Hikon A-60, S-4
(These are product names manufactured by Tsuchiya Karion Co., Ltd.), NYAD3
25,400,1250, G (above, NYCO (USA)
Wollastonite (calcium metasilicate) such as product name), Celite 270, 281, 501, 50
3,505,535,545,560,577, FC,
SSC, Super Floss, Now Flos
s (above, trade name manufactured by Johns-Manville Co. (USA)), Radio Light # 100, # 200,00, # 500, # 5
00S, # 600, # 700, # 800, # 800-
Diatomaceous earth such as S, # 900, F, SPF, Fine Flow A, Fine Flow B (above, trade name of Showa Chemical Industry Co., Ltd.), Zinc Hua No. 1 (trade name of Sakai Chemical Industry Co., Ltd.) Examples thereof include zinc oxide, aluminum sulfate, barium sulfate, calcium sulfate, titanium oxide, molybdenum disulfide, and the like, and usually 1 to several types are used together with the reinforcing filler.

Further, in order to improve the abrasion resistance, a suitable abrasive, mainly an inorganic powder having a Mohs hardness of 6 or more, is used in an amount of 3 to 10.
You may add about 0 weight part.

An inorganic powder having a Mohs hardness of 6 or more means Moh.
Zirconium oxide (ZnO2: Mohs) is a metal powder having a hardness of 6 (feldspar) or more with a hardness of s (Mohs), metal oxides, metal nitrides, and other nonmetals, and a mixture of them in an appropriate ratio. Hardness 7-8.5), zircon (mixture of zirconium oxide and silicon oxide: Mohs hardness 7.5), α-alumina (Al2O3: Mohs hardness 9),
Silicon carbide (SiC: Mohs hardness 9 to 10), triiron trioxide (Fe3O4: Mohs hardness 6), red iron oxide as red iron oxide (α-Fe2O3: Mohs hardness 6), and maghemite (γ as triiron trioxide) -Fe2O3: Mohs hardness 6),
Diatomaceous earth (Johns-Manville Co. (USA) Celite 535
(Product name), etc .: Mohs hardness 8), silica, silica, quartz powder and other silicon oxides (SiO2: Mohs hardness 7), tin oxide (SnO2: Mohs hardness 6.5), magnesium oxide (MgO: Mohs hardness 6) ), Calcium oxide (Ca
O: Mohs hardness 6), titanium oxide (TiO2: Mohs hardness 6 to 7), chromium oxide (Cr2O3: Mohs hardness 9),
Synthetic diamond powder (C: Mohs hardness 10), aluminum nitride (AIN: Mohs hardness 7), silicon nitride (Si
3N4: Mohs hardness 9 to 10), devitron (crystallized glass: lithium disilicate (Li2O2SiO2) Mohs hardness 6) and the like.

In the present invention, in order to improve the kneading properties of rubber and the extrudability, it is possible to add about 0.3 to 5 parts by weight of a lubricant or an internal release agent. Since it causes bleeding and poor fusion,
Although it depends on the kind, it is usually used in an amount of about 0.5 to 1 part by weight.

As these lubricants and internal release agents, Mitsui High Wax 100P, 110P, 200P, 210
Low molecular weight polyethylene such as P, 220P, 320P, 420P (above, trade name of Mitsui Petrochemical Co., Ltd.),
Lunack S-20, S-30, S-40 (above, trade name manufactured by Kao Corporation), FA-KR (trade name manufactured by NOF Corporation) and ADEKA fatty acid SA-20, SA-300, SA
-400 (above, product name of Asahi Denka Co., Ltd.) stearic acid, plastrosine, plastrosin S (above,
Fujisawa Pharmaceutical Co., Ltd. product name) fatty acid amide,
Aflex42 (Rein, a fatty acid nitrogen derivative such as Armowax EBS (trade name of Lion Akzo Co., Ltd.)
Struktol A60 (Schill & Seillacher), a mixture of polar compounds such as Chemie (Germany) and a surfactant.
Highly unsaturated fatty acid zinc (such as trade name manufactured by Germany), Str
Special fatty acid zinc such as uktol EF44 (trade name of Schill & Seillacher (Germany)), Struktol W
A mixture of fatty acid calcium and fatty acid amide, such as B16 (trade name of Schill & Seillacher (Germany)), Struk
A mixture of fatty acid ester and fatty acid metal salt such as tol WB42 (trade name of Schill & Seillacher (Germany)), S
truktol WB212 (Schill & Seillacher
(German product name) mixture of higher fatty acid ester hydrate and inorganic carrier, Struktol WB222
Polyhydric alcohol fatty acid ester such as (Schill & Seillacher (Germany) product name), Struktol WS18
0 (trade name of Schill & Seillacher (Germany)), an organic silicone condensate, Struktol W33FL (Sc
Examples include a mixture of a high molecular weight natural aliphatic alcohol and an aliphatic soap treated with an inert filler such as hill & Seillacher (Germany)), paraffin wax, montan wax, and the like.

Next, Examples 1 to 8 of the present invention and Comparative Examples 1 to 8 in the comparative experiments shown in the following description and Tables 1 to 3
The present invention will be described in more detail based on 2.

"Examples 1 to 8 and Comparative Examples 1 and 2" First,
As EPDM, 100 parts by weight of EP27 (trade name of Nippon Synthetic Rubber Co., Ltd.), 20 parts by weight of Zinc Hua No. 1 (zinc oxide: trade name of Sakai Chemical Industry Co., Ltd.) as a vulcanization aid, and Acryester TMP (trimethacryl) Trimethylolpropane acid: Mitsubishi Rayon Co., Ltd. product name) 2 parts by weight,
Asahi # 50 (carbon black (SR
F): Asahi Carbon Co., Ltd. product name) 20 parts by weight, Sansen 450 (naphthene-based process oil) as a softening agent:
Nippon Sun Oil Co., Ltd. product name) 85 parts by weight, Lunac # 20 (stearic acid: Kao Co., Ltd. product name) 1 part by weight as a lubricant, and a predetermined amount of a predetermined kind of peroxide shown in Table 1 below. The added composition was kneaded with a pressure kneader.

Next, Examples 1 to 8 were performed at 170 ° C. for 10 minutes.
The compositions of Comparative Examples 1 and 2 were vulcanized to prepare a test piece having a thickness of 2 mm and the physical properties thereof were measured according to JISK6301. The results are shown in Table 2.

[0041]

[Table 1]

[0042]

[Table 2]

From the results shown in Table 2, it was found that in Examples 1 to 8, the permanent elongation was relatively small, whereas in Comparative Example 1 in which the amount of peroxide was small, the permanent elongation was large.

On the contrary, in Comparative Example 2 in which the amount of peroxide was excessive, it was also found that a gas which is considered to be generated from the excessive peroxide during vulcanization caused a small amount of foaming and a good product could not be obtained. It was

Next, using these compositions, an outer diameter of 25
mm, an inner diameter of 19 mm, and a height of 10 mm were formed, and the workability at that time, mainly the mold releasability, was evaluated. At the same time, the paper feed roller after molding was allowed to stand at room temperature for 7 days to observe whether or not blooming occurred. Table 3 shows the results.

[0046]

[Table 3]

From the results shown in Table 3, the amount of peroxide added was 3-6.
It was found that the paper feed roller using the composition in an amount of part by weight has a practically usable level of formability, and 3.2 to 4.0 parts by weight provides a better formability. On the contrary, in Comparative Example 1, it was found that the mold releasability from the mold was poor and there was a problem in practical use.

Next, in order to evaluate the durability of each of the above samples, a copying machine NP6030 (trade name) manufactured by Canon Inc.
When a paper passing durability test was conducted by incorporating the
The paper feed roller of No. 8 showed good paper feed characteristics even after passing 200,000 sheets, but the paper feed roller of Comparative Example 1 had a paper feed failure at the time of 100,000 sheets.

Comparative Example 1 When the paper feed roller was removed, it was found that the deformation of the shape was so great that it could not function as a paper feed roller.

When the core metal and the rubber composition are adhered to each other, it can be dealt with by using an appropriate adhesive. At this time, the surface of the core metal is activated by sandblasting or the like and then methylene is used. After degreasing with chloride etc.,
A primer is applied and, if necessary, baked at 100 ° C. for about 30 minutes before use.

The adhesive for ordinary EPDM can be applied, and this is Chemlok 220,2.
34B, 236, 238, 246, 250, 252, 6
07, Y4310, Ty-Ply (type lie) BN
(Above, trade name by Lord Far East Incorporated), Metalloc FB, FC, P (above, trade name by Toyo Kagaku Kenkyusho Co., Ltd.), THIXON (Sixon) 508,511-T, 715,814- 1,20
00, GPO (above, product name manufactured by Morton International Co., Ltd.), etc.
mlok205, 607, AP133, Y4310 (above, product name manufactured by Road Far East Incorporated), METALLOCK P, PA, PF (above, product name manufactured by Toyo Kagaku Kenkyusho Co., Ltd.), THIXONP-6-
1, P-7-3, P-15, P-15S, P-16 (above, Morton International Co., Ltd. product name)
After applying a primer such as the above, the above-mentioned adhesive is overcoated and used.

[0052]

As described above, according to the present invention, it is possible to obtain a conveyance roller having no paper feeding failure and extremely excellent durability.

Claims (3)

[Claims] 1. An ethylene-propylene copolymer rubber 100.
A rubber composition for a roller, characterized in that 3 to 6 parts by weight of a vulcanizing agent made of a peroxide is added to parts by weight. 2. The peroxide is dicumyl peroxide or α, α′-bis (t-butylperoxy-m-isopropyl) benzene or 2,5-dimethyl-2,5-.
The rubber composition for a roller according to claim 1, comprising di (t-butylperoxy) hexane or 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane. 3. The rubber composition for a roller according to claim 1, wherein the roller is a paper feeding roller or a conveying roller.