JP2889997B2 - Master batch containing organic peroxide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to organic peroxides of 10 to 70%.
The present invention relates to a masterbatch containing, by weight, in a polymer or rubber and having excellent storage stability.

[0002]

2. Description of the Related Art Thermoplastics such as polyethylene (hereinafter abbreviated as PE) and ethylene-vinyl acetate copolymer (hereinafter abbreviated as EVA), ethylene-propylene rubber (hereinafter abbreviated as EPR), and butadiene-acrylonitrile copolymer Elastomers (hereinafter abbreviated as NBR) are widely used because they are industrially inexpensive and abundant, and have many excellent physical properties and characteristics. These thermoplastics and elastomers can be crosslinked by adding an appropriate amount of an organic peroxide and performing a heat treatment, and are widely used industrially as a simple method for improving the heat resistance. It is not preferable to add and mix the organic peroxide as a pure product when performing crosslinking, and it takes a long time for uniform dispersion, and it is not preferable from the viewpoint of safety. Dilutions carried on inert fillers, such as, have generally been used. Although such a diluted product is safer than a pure product, the organic peroxide is usually added to and kneaded with a polymer or rubber (hereinafter abbreviated as polymers) by an open mixer such as a two-roll mixer. However, such a dilute product has a poor mixing property with the polymer, and must be dropped from the kneading band during kneading and repeated over and over, so that it takes time to uniformly mix. In addition, there is also a problem in the working environment that dust is formed during kneading and the worker inhales. In order to solve such a problem, a masterbatch containing an organic peroxide in polymers to be crosslinked has been proposed. This organic peroxide-containing masterbatch has been developed with reference to carbon black, sulfur, pigments, vulcanization accelerators, and other masterbatches that have been widely used in the rubber industry. It covers a wide range of areas, including EVA, EPR, and NBR. Various organic peroxides are used in an amount of 10 to 70 so that the content and type of the organic peroxide can be selected according to the purpose.
% Are commercially available. The use of these organic peroxide-containing masterbatches allows not only dust-free addition and kneading, but also streamlining of the process, such as shortening the kneading time with a roll or a Banbury mixer because of good mixing with the polymer. Has the effect of doing so.

[0003]

However, such an organic peroxide-containing masterbatch has a disadvantage that its storage stability is poor. That is, during storage, the organic peroxide contained in the master batch migrates to the surface of the polymers. In a masterbatch containing an organic peroxide that is solid at room temperature, the organic peroxide migrates to the surface of the polymer to form a powder, which is separated and separated from the pure organic peroxide part and the masterbatch having an uneven purity. Divided into parts.
In a masterbatch containing organic peroxide that is liquid at room temperature, the organic peroxide migrates to the surface of the polymer and exudes, and as a result, the liquid organic peroxide separates to the bottom of the container used for packaging, The master batches that are originally granular or plate-like aggregate with each other to form a large mass. Even if the large batch of master batches is once again made into granules or plates, the organic peroxide migrates and the purity is non-uniform, so that it cannot be used anymore. It is already known that changing the viscosity of the polymers used in the masterbatch and the proportion of the copolymer will have a certain effect on the storage stability. Some types have high viscosity. However, the storage stability mentioned above is still not sufficiently improved. For example, rubber having a relatively high Mooney viscosity is used for rubber such as EPR. Even if the conventional organic peroxide-containing masterbatch is stored at a temperature of 10 to 20 ° C., it migrates to the surface after about several months, and when the temperature becomes 30 ° C. or more, it deteriorates extremely after 1 to 2 weeks. A method for producing an organic peroxide-containing masterbatch having excellent storage stability has not been found, and a solution to this problem has long been required.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies on a method for preventing the transfer of organic peroxide to the surface of polymers during storage of an organic peroxide-containing masterbatch. During production, the storage stability of the masterbatch is improved by adding silicone oil to the organic peroxide that is solid at room temperature and adding silica that has adsorption capacity to the organic peroxide that is liquid at room temperature. Has been surprisingly found to lead to the present invention. That is, the present invention relates to an organic peroxide 10
To 70% by weight of a masterbatch, wherein 2 to 10% by weight of silicone oil is added to an organic peroxide which is solid at room temperature, and 2 to 10% by weight of an organic peroxide which is liquid at room temperature. The present invention relates to an organic peroxide-containing masterbatch excellent in storage stability, characterized by being added with silica having an adsorbing ability of weight%. The addition of silicone oil to a masterbatch containing an organic peroxide that is solid at room temperature not only prevents the organic peroxide from migrating to the polymer surface over time, but also prevents the masterbatch from becoming hard during storage. A new effect of prevention can also be obtained. Addition of silica with adsorption capacity to a masterbatch containing organic peroxide that is liquid at room temperature causes the organic peroxide to be uniformly dispersed in polymers as a powder while being adsorbed on silica, so Transfer to the surface of the masterbatch so that no agglomeration of the masterbatch occurs during storage. As the silicone oil in the present invention, any one can be used as long as it is generally used for diluting (pasting) an organic peroxide, and examples thereof include dimethyl silicone oil and methyl vinyl silicone oil. It is desirable to use one having a viscosity of 1000 centistokes or less to facilitate the kneading of the oxide into polymers. The addition amount of the silicone oil varies depending on the content of the organic peroxide in the masterbatch, but is 2 to 10% by weight based on the content of the organic peroxide. Addition of more than 10% by weight softens the masterbatch and rather deteriorates the storage stability.

In the present invention, the silica having an adsorbing ability can be any silica having a pore diameter, and examples thereof include Mizukasorb BH-30 and Mizukasorb S-1 manufactured by Mizusawa Chemical Industry Co., Ltd. The addition amount of the silica having the adsorptivity varies depending on the content of the organic peroxide in the masterbatch, but is 2 to 10% by weight based on the organic peroxide. Even if silica having an adsorption capacity of more than 10% by weight is added, a masterbatch excellent in storage stability can be obtained, but the masterbatch becomes hard and is not practically preferable.
In the present invention, all polymers that can be crosslinked with an organic peroxide can be used. Specifically, PE, chlorinated polyethylene (hereinafter abbreviated as CM), chlorosulfonated polyethylene (hereinafter abbreviated as CSM), polybutylene, polyisobutylene, EVA, natural rubber, polyacrylate rubber, EPR, ethylene propylene diene rubber (Hereinafter abbreviated as EPDM), polybutadiene, polyisoprene, styrene butadiene rubber (hereinafter abbreviated as SBR), NBR, silicone rubber, polyurethane, polysulfide rubber, acrylonitrile butadiene / styrene terpolymer and the like, and blends thereof can also be used. .
Since the organic peroxide used in the present invention is used to crosslink polymers, it is preferable to use a high-temperature decomposition type as judged from the half-life of the organic peroxide. Specifically, benzoyl peroxide, O-chlorobenzoyl peroxide, P-chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, O-
Diacyl peroxides such as methylbenzoyl peroxide, alkyl peresters such as tertiary butylperoxybenzoate, percarbonates such as tertiary butylperoxyisopropyl carbonate, 1,1-ditertiary butylperoxy- 3,3,5 trimethylcyclohexane, 1,1-
Ditertiary butyl peroxy-cyclohexane,
Peroxy ketals such as 4,4-di-tert-butyl peroxyvaleric acid normal butyl ester, dicumyl peroxide, di-tert-butyl peroxide, tert-butyl cumyl peroxide, 2,5-dimethyl-2,5 Di (tert-butylperoxy) hexane, 2,5-dimethyl-2,5
-Di (tert-butylperoxy) hexyne-3,
Dialkyl peroxides such as 1,3-bis (tert-butylperoxyisopropyl) benzene and 1,4-bis (tert-butylperoxyisopropyl) benzene, tertiary butyl hydroperoxide and cumene hydroperoxide Hydroperoxides and mixtures of two or more of these. The content of the organic peroxide in the masterbatch is 10 to 70% by weight for both solid and liquid organic peroxides at room temperature.

In order to produce the organic peroxide-containing masterbatch of the present invention, an organic peroxide, a polymer, silicone oil or silica having adsorptive capacity may be added and mixed at the same time. A blend in which oil or silica having adsorbing ability is mixed may be added to and mixed with the polymer, and the order of addition and mixing does not matter. The organic peroxide-containing masterbatch of the present invention may be, depending on its use, a filler such as carbon black, calcium carbonate, white carbon, and talc; a lubricant such as stearic acid and zinc stearate; a pigment; a dye; An antioxidant such as shary butyl-4-methylphenol, an ultraviolet absorbent, a foaming agent, a process oil, a dispersing aid and the like can be added. Such additives and the like may be added at the same time as organic peroxide, silicone oil or silica having adsorptive capacity when producing a master batch, or those previously added to the polymer may be used. For the production of the organic peroxide-containing master batch of the present invention, a Banbury mixer, a pressure kneader, an extruder, a co-kneader, a transfer mixer, a two-roll mill, or the like can be used. Planetary mixers can also be used. The organic peroxide-containing masterbatch of the present invention is preferably mixed and kneaded at as low a temperature as possible to prevent decomposition of the organic peroxide, depending on the type of the polymer used. Specifically, the temperature is from room temperature to about 130 ° C., and in order for the organic peroxide to be uniformly dispersed in the polymers, a kneading time of 5 minutes to 40 minutes after adding all the compounding agents and additives is added. Appropriate. Since the organic peroxide-containing masterbatch of the present invention is usually manufactured in a lump, plate, or rod shape, it is cut into a desired shape such as a granule by a pelletizer, a cutting machine, or the like, if necessary. According to the present invention, silicone oil or silica having adsorptive capacity is added to the polymers to be crosslinked, and the amount of the organic peroxide-containing masterbatch used for crosslinking the polymer is, for example, 40% by weight. Since the masterbatch containing 0.1% is at most about 10% by weight based on the polymer, silicone oil or silica having adsorptivity is added at most about 0.4% by weight based on the polymer. Such an addition amount has no effect on the physical properties or properties of the crosslinked polymers.

[0007]

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the following examples and comparative examples do not limit the present invention at all. Examples 1-4 Comparative Examples 1-4 A co-kneader PR-100 type continuous kneader manufactured by Buss Inc. was heated to about 50 ° C. to prepare an organic peroxide-containing master batch by EVA as shown in Table 1. In Examples, organic peroxides, polymers, silicone oil or silica having adsorptive capacity were added at the ratios shown in Table 1, and in Comparative Examples, only organic peroxides and polymers were used. The obtained organic peroxide-containing masterbatch was applied to a pelletizer to obtain pellets having a diameter of about 5 mm. The pelletized masterbatch was placed in a PE bag in an amount of 10 kg each, and further placed in a cardboard box, and subjected to a storage stability test at 25 ° C and 40 ° C. The content of organic peroxide in the master batch is determined by gas chromatography (hereinafter abbreviated as GLC).
Alternatively, analysis was performed by high performance liquid chromatography (hereinafter abbreviated as HPLC). The results are summarized in Table 1. The brands and vinyl acetate contents of the EVA used are as follows. EVA brand Vinyl acetate content (%) Evaflex 560 14 Evaflex 260 28 Lehaprene 450 45 Evaflex 250, 260: manufactured by Mitsui Polychemicals Co., Ltd. Rehaperene 450: manufactured by Bayer AG

Table 1 Experiment No. Example 1 2 3 4 EVA Evaflex560 Evaflex260 Evaflex260 Rehapprene 450 (% by weight) 57 79 77 88.3 Organic peroxide Kayacumyl D Perkadox14 Kayabutyl B Trigonox29 (% by weight) (solid) (solid) (liquid) ) (Liquid) 41 20 21 11 Silicone oil H-200-1000 SH-200-1000--(% by weight) 2 1 Adsorbent silica--Miss @ Casof @ Miss @ Casophor (% by weight) BH-30 BH-30 2 0.7 Organic peroxide Material 40.6 19.6 19.8 10.7 Content (%) Storage stability 6 months organic test Peroxide transfer Left Same as left Same as left (25 ° C) No row Experiment number Example 1 2 3 4 Storage stability 3 months Organic Same as left Same as left 3 months later Surface test Peroxide transfer Faintly Tr (40 ° C) No igonox 29 transfer

(Note) (solid) indicates a solid at room temperature and (liquid) indicates a liquid at room temperature. same as below. Kayacumyl D: dicumyl peroxide Perkadox 14: 1,3-bis (tert-butylperoxyisopropyl) benzene Kayabutyl B: tert-butylperoxybenzoate Trigonox 29: 1,1-di-tert-butylperoxy-3,3 , 5 Trimethylcyclohexane SH-200-1000 manufactured by Kayaku Akzo Co., Ltd. Silicone oil viscosity 1000 centistoks Mizukasorb BH-30 manufactured by Toray Dow Corning Silicone Co., Ltd. Adsorbent silica manufactured by Mizusawa Chemical Industry Co., Ltd.

Table 1 (continued) Experiment No. Comparative Example 1 2 3 4 EVA Evaflex560 Evaflex260 Evaflex260 Levaprene 450 (% by weight) 59 80 79 89 Organic peroxide Kayacumyl D Perkadox14 Kayabutyl B Trigonox29 (% by weight) (solid) (solid) (Liquid) (Liquid) 41 20 21 11 Organic peroxide 40.7 19.9 19.7 10.5 Content (%) Storage stability 3 months after surface 2 months after surface 2 months after surface 1 month after testing Kayacumyl D Parkadox 14 In addition, Kayabutyl B Trigonox (25 ° C) became powdery and transferred to a powdery state, and the transfer was transferred and the stick was moved 29. The stamen was sticked. Storage stability 15 days after the surface 10 days on the surface 7 days after the surface Kayabutyl 3 days after the transfer Trig test Kayacumyl D Fused Perkadox 14 migrated to B and onox 29 migrated (40 ° C) to become liquid and powdery, migrated to the bottom of the PE bag and migrated to the master. From the results of EVA with low vinyl content
Although the storage stability is slightly better than those containing more, it is clear that the addition of silica or silicone oil having an adsorbing ability significantly improves the storage stability.

Examples 5 to 12 Comparative Examples 5 to 8 The EP shown in Table 2 was passed by passing cooling water through a Banbury mixer.
R, an organic peroxide compounding agent, and the like were charged, and each was kneaded for 10 minutes to prepare an organic peroxide master batch by EPR. The composition is as shown in Table 2. In Comparative Examples, silicone oil or silica having adsorptive ability was not used.
The obtained organic peroxide-containing masterbatch was subjected to a pelletizer to obtain cubic pellets of 5 mm square. The storage stability test and the analysis of the organic peroxide content were performed in the same manner as in Examples 1 to 4. Table 2 summarizes the results. The brand and Mooney viscosity of the EPR used are as follows. EPR brand Mooney viscosity KELTAN 300 ML _{1 + 4} (125 ° C.) = 35 DSM Mitsui EPT 3070 ML _{1 + 4} (100 ° C.) = 65 Mitsui Petrochemical Industries BUNA AP 407 ML _{1 + 4} (100 ° C.) = 85 Bayer BUNA AP 201 ML _{1 + 4} (100 ° C) = 45 Bayer

Table 2 Experiment No. Example 5 67 8 EPR KELTAN300 KELTAN300 Mitsui EPT3070 BUNAAP407 (% by weight) 22 27 27 30 Organic peroxide perkadox14 Kayahexa AD Kayahexa AD Trigonox17 (% by weight) (solid) (liquid) (liquid) (Liquid) 50 42 42 31 Filler Light calcium carbonate Light calcium carbonate Light calcium carbonate (% by weight) Cium Cium Cium 24.5 5 Same as left 5.5 White car phone White car phone 23 32 Silicone oil SH-200-100---(Weight% 3.5 Adsorbent silica-Miss-Casorf S-1 Miss-Casorf-S-1 Miss-Casorf S-2 (% by weight) 3 3 1.5 Organic peroxide 49.7 40.3 40.1 29.8 Content (%)

Experiment No. Example 5 6 7 8 Storage stability test Organic for 6 months (25 ° C.) No peroxide transfer Left same Same as left Same as left No aggregation of masterbatch Storage stability test Organic for 3 months (40 ° C) No peroxide transfer Left Same as left Same as left Same as above No aggregation of master batch Kayahexa AD: 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane Trigonox 17: 4 , 4 ditertiary butyl peroxyvaleric acid normal butyl ester Kayabutyl C: tertiary butyl cumyl peroxide

Table 2 (Continued) Experiment No. Example 9 10 11 12 EPR BUNA AP201 BUNA AP407 BUNA AP201 BUNA AP407 (% by weight) 30 34 34 57.5 Organic peroxide Trigonox 17 Kayabutyl C Kayabutyl C Kayacumyl D (% by weight) (Liquid) (Liquid) (Liquid) (Solid) 31 22 32 40 Filler Light calcium carbonate White carbon White carbon None (Weight%) Cium 43 33 5.5 White carbon 32 Silicone oil---SH-200-100 (Weight%) 2.5 Adsorbable silica Miss-Casorf S-2 Miss-Casorf S-3 Miss-Casorf S-3-(% by weight) 1.5 1 1 Organic peroxide 30.0 20.3 30.1 39.8 Content (%)

Experiment No. Example 9 10 11 12 Storage stability test Organic for 6 months (25 ° C.) No peroxide migration Left same Same as left Same as left No aggregation of masterbatch Storage stability test Organic for 3 months (40 ° C) No peroxide migration Left-same Left-same Left-same No agglutination of master batch SH-200-100: Silicone oil Viscosity 100 centistokes Toray Dow Corning Silicone Mizukasorb S-1, S- 2, S-3 adsorptive silica manufactured by Mizusawa Chemical Industry Co., Ltd.

Table 2 (Continued) Experiment No. Comparative Example 5 67 8 EPR KELTAN300 Mitsui EP3070 BUNA AP407 BUNA AP201 (% by weight) 22 27 30 35 Organic peroxide Perkadox14 Kayahexa AD Trigonox17 Kayabutyl C (% by weight) (solid) (Liquid) (Liquid) (Liquid) 50 42 31 32 Filler Light calcium carbonate Light calcium carbonate Light calcium carbonate White carbon (wt%) Cium Cium Cium 33 28 8 7 White carbon White carbon 23 32 Organic peroxide 49.6 40.5 30.3 30.1 Content (%) Storage stability 3 months after surface 2 months after 2 months 4 months after T- 2 months after K-test Perkadox 14 Yahexa AD rigonox 17 ayabutyl C (25 ℃) powdered to surface Stain on the surface Stain on the surface Stain on the surface Migrated extruded With extruded With extruded Master batch Master bag Master bag No coagulation of master bag No agglomeration No agglomeration Experiment No. Comparative Example 5 6 7 8 Storage stability 15 days after surface 10 days after power 15 days after Tr 10 days after Ka test Perkadox yahexa AD igonox 17 yabutyl C (40 ° C) 14 powdered However, the transfer to the surface was transferred to the P surface, the transfer was made to the P surface, and was collected in the master E bag.The master batch was agglomerated and the master batch was agglomerated.

Examples 13 to 20 Comparative Examples 9 to 12 A predetermined amount of EPDM is wound around a roll by passing cooling water through a two-roll mill, and the organic peroxides and compounding agents shown in Table 3 are added. After kneading for 20 minutes, the mixture was turned back for 10 minutes to obtain an organic peroxide-containing plate-like master batch having a thickness of about 7 mm. This is cut and stacked on a board of about 25 cm x 40 cm to make 10 kg, put in a PE bag, and further put in cardboard.
The storage stability test was performed at 0 ° C and 40 ° C. The analysis of the organic peroxide content was performed in the same manner as in Examples 1 to 4. Table 3 summarizes the results. The brand Mooney viscosity of the EPDM used is as follows. EPDM brand Mooney viscosity BUNA AP 147 ML _{1 + 4} (100 ° C.) = 35 Bayer BUNA AP 541 ML _{1 + 4} (100 ° C.) = 110 Bayer JSR EP 24 ML _{1 + 4} (100 ° C.) = 65 JSR EP 27 ML _{1 + 4} (100 ° C) = 105 manufactured by Nippon Synthetic Rubber Co., Ltd.

Table 3 Experiment No. Example 13 14 15 16 EPDM BUNA AP147 BUNA AP541 BUNA AP147 BUNA AP541 (% by weight) 27 27 30 30 Organic peroxide Perkadox64 Perkadox64 Kayahexa AD Kayahexa YD (% by weight) (solid) (solid) (Liquid) (Liquid) 32 32 41 41 Filler Light calcium carbonate Light calcium carbonate (% by weight) Cium 33 33 Same as left 5 Same as left White car phone White car 622 Silicone oil SH-200-50 Same as left − − (weight %) 2 Adsorbable silica--Miss {Casof} S-2 Same as left (wt%) 2 Organic peroxide 30.7 30.5 40.0 40.1 Content (%)

Experiment No. Example 13 14 15 16 Storage stability Organic test for 6 months Peroxide transfer (25 ° C.) No line left Same as left Same as left No aggregation of master batch Storage stability 3 month organic test Peroxide transfer (40 ° C) No line left Same as left Same as left No cohesion of master batch

Table 3 (Continued) Experiment No. Example 17 18 19 20 EPDM JSR EP 24 JSR EP 27 JSR EP 24 JSR EP 27 (% by weight) 28 28 30 30 Organic peroxide Perkadox14 Kayacumyl D Trigonox17 Trigonox29 (% by weight) (Solid) (Solid) (Liquid) (Liquid) 51 51 32 32 Filler Light calcium carbonate Light calcium carbonate (% by weight) Cium Cium 15 Same as left 7 Same as left White car white White car 3.5 3.5 Silicone oil SH-200-50 Same as the left--(wt%) 2.5 Adsorbent silica--Miss {Casof} S-3 Same as the left (wt%) 1 Organic peroxide 50.0 49.9 30.2 30.0 Content (%)

Experiment No. Example 17 18 19 20 Storage stability Organic test for 6 months Peroxide transfer (25 ° C.) No line left Same as left Same as left No aggregation of masterbatch Storage stability 3 month organic test Peroxide transfer (40 ° C) No line left Same as left Same as left No aggregation of master batch Perkadox 64: 1,4-bis (tert-butylperoxyisopropyl) benzene Kayahexa YD: 2,5 dimethyl 2,5 (Tertiary butyl peroxy) hexine-3 or more Chemical product Akzo Co., Ltd. SH-200-50: Silicone oil viscosity 50 centistokes Toray Dow Corning Silicone Co., Ltd.

Table 3 (continued) Experiment No. Comparative Example 9 10 11 12 EPDM BUNA AP147 BUNA AP541 JSR EP 24 JSR EP 27 (% by weight) 30 30 28 28 Organic peroxide Kayahexa AD Kayahexa YD Perkadox14 Kayacumyl D (% by weight) (Liquid) (Liquid) (Solid) (Solid) 41 41 51 51 Filler Light calcium carbonate Light calcium carbonate (% by weight) Cium Cium 6 Same as left 17 Same as left White car white White car 23 23 4 Organic peroxide 40.3 40.5 50.2 50.5 Content (%) Storage stability 2 months after Kaya 4 months after Kaya 1 month after Per- 4 months after Ka-test Hexa AD HexaYD kadox 14 yacumyl D (25 ° C) The surface of the board is powdery and the surface is powdery and the shape is masterbatch.The masterbatch shifts and shifts, and the switches are dense.

Experiment No. Comparative Example 9 10 11 12 Storage stability 7 days after kayak 20 days after kayak 10 days after Perk 25 days after kaya test Kisa AD and HexaYD, adox 14 and cumyl D at (40 ° C.) and exuded at the bottom. The surface of the plate becomes powdery and the surface of the powder becomes powdery.It becomes a master bar, and it shifts and shifts, and the plate-shaped master sticks are dense. 2. From the results in Table 3, it can be said that the use of a polymer having a high Mooney viscosity results in a slightly superior storage stability of the obtained organic peroxide-containing masterbatch. But 40
Storage stability at ℃ has a practical problem. It is evident that the addition of the silicone oil or silica with adsorptive capacity according to the invention dramatically improves the storage stability.

[0024]

According to the present invention, it is possible to remarkably improve the storage stability of an organic peroxide-containing masterbatch, which has been a major drawback in the past, and the use of the masterbatch is greatly expanded. Therefore, the industrial value is extremely large.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ identification symbol FI // C08L 23:16 (58) Field surveyed (Int. Cl. ⁶ , DB name) C08J 3/22 C07C 409/00 C07F 7 / 08 C08K 5/14 C08L 101/00

Claims (2)

(57) [Claims] 1. A master batch containing 10 to 70% by weight of an organic peroxide solid at room temperature in a polymer or rubber, wherein 2 to 10% by weight of silicone oil is added to the organic peroxide. Organic peroxide containing masterbatch. 2. A masterbatch containing 10 to 70% by weight of an organic peroxide liquid at room temperature in a polymer or rubber, wherein silica having an adsorption capacity of 2 to 10% by weight with respect to the organic peroxide is added. A master batch containing an organic peroxide, comprising: