Rubber composition and hose

Abstract

To provide a rubber composition that is excellent in elongation at break and tear strength while maintaining excellent oil resistance.SOLUTION: A rubber composition contains a chloroprene rubber and a scaly filler, the content of the scaly filler is less than 5.0 pts.mass relative to 100 pts.mass of the chloroprene rubber. There is also provided a hose formed using the rubber composition.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rubber composition and a hose. [Background technology]

[0002] Conventionally, rubber compositions that contain diene rubber, flaky fillers, and the like and that can be used to form hoses have been proposed (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-179523 Summary of the Invention [Problem to be solved by the invention]

[0004] The rubber composition used as the interlayer rubber in oil-resistant hoses is usually rolled into an extremely thin sheet, which increases the bending rigidity of the hose. However, this makes the hose prone to scorch (premature vulcanization) and limits properties such as elongation at break (also called "elongation at break"; the same applies below) and tear strength. Furthermore, since chloroprene rubbers tend to crystallize, rubber compositions containing chloroprene rubbers have poor rolling processability and moldability, which has hindered improvements in physical properties such as elongation at break and tear strength.

[0005] Therefore, an object of the present invention is to provide a rubber composition that has excellent elongation at break and tear strength while maintaining excellent oil resistance. Another object of the present invention is to provide a hose. [Means for solving the problem]

[0006] As a result of intensive research to solve the above problems, the inventors discovered that the desired effects can be achieved by making the rubber composition contain a chloroprene-based rubber and a scaly filler, and by keeping the content of the scaly filler in the rubber composition to an extremely small amount, thereby arriving at the present invention. The present invention is based on the above findings and solves the above problems by specifically providing the following configurations.

[0007] [1] A rubber composition comprising a chloroprene rubber and a flaky filler, the flaky filler being contained in an amount of less than 5.0 parts by mass per 100 parts by mass of the chloroprene rubber. [2] The rubber composition according to [1], wherein the scaly filler contains at least one selected from the group consisting of talc, mica, and clay. [3] The rubber composition according to claim [1] or [2], wherein the scale-like filler includes a scale-like filler (FR) derived from the chloroprene-based rubber. [4] The rubber composition according to [3], wherein the amount of the scale-like filler (FR) is less than 2.0 parts by mass per 100 parts by mass of the chloroprene rubber. [5] The rubber composition according to [3] or [4], wherein the scaly filler is the scaly filler (FR) alone. [6] The rubber composition according to [3] or [4], wherein the scaly filler further contains a scaly filler (FE), with the proviso that the scaly filler (FR) does not contain the scaly filler (FE). [7] A hose formed using the rubber composition according to any one of [1] to [6]. [Effects of the Invention]

[0008] The rubber composition of the present invention has excellent elongation at break and tear strength while maintaining excellent oil resistance. The hose of the present invention has excellent elongation at break and tear strength while maintaining excellent oil resistance. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing an example of a hose of the present invention with each layer cut away. [Figure 2] FIG. 2 is a perspective view showing another example of a hose of the present invention with each layer cut away. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in detail below. In this specification, a numerical range expressed using "to" means a range that includes the numerical values written before and after "to". In this specification, unless otherwise specified, each component may be used alone or in combination of two or more substances. When a component contains two or more substances, the content of the component means the total content of the two or more substances. In this specification, when at least one of oil resistance, elongation at break, and tear strength is superior, it may be said that the effect of the present invention is superior.

[0011] [Rubber composition] The rubber composition of the present invention contains a chloroprene rubber and a flaky filler, the content of the flaky filler being less than 5.0 parts by mass per 100 parts by mass of the chloroprene rubber. Each component contained in the rubber composition of the present invention will be described in detail below.

[0012] [Chloroprene rubber] The chloroprene rubber (CR) contained in the rubber composition of the present invention is not particularly limited as long as it is a homopolymer having structural units based on chloroprene (2-chloro-1,3-butadiene).

[0013] CR may be modified. The type of modification is not particularly limited. Examples of the modification include mercaptan modification, sulfur modification, and xanthogen modification. The position of the modification may be, for example, the terminal of CR.

[0014] (CR content) From the viewpoint of achieving superior effects of the present invention, the content of CR is preferably 80% by mass or more, and more preferably 100% by mass, of the total rubber components contained in the rubber composition of the present invention. When the rubber composition of the present invention further contains a rubber other than CR, the rubber other than CR is not particularly limited.

[0015] (CR manufacturing method) The method for producing CR is not particularly limited. For example, a conventionally known method can be used. Furthermore, commercially available products can be used as CR.

[0016] [Scale-like filler] The rubber composition of the present invention contains a scaly filler. In the present invention, the above-mentioned "flake-like filler" refers to all of the flake-like fillers contained in the rubber composition of the present invention. In the present invention, the "scale-like filler" refers to a filler having a scale-like shape. The outer periphery of the scale-like filler may be irregular.

[0017] [Specific examples of scale-like fillers] Examples of the scaly filler contained in the rubber composition of the present invention (hereinafter also referred to as "the scaly filler") include talc, mica, clay, sericite, and montmorillonite.

[0018] From the viewpoint of achieving better effects of the present invention, the scaly filler preferably contains at least one selected from the group consisting of talc, mica, and clay.

[0019] [Flake filler (FR)] In one preferred embodiment, the scaly filler contains the scaly filler (FR) derived from the chloroprene rubber. Note that the "scaly filler (FR) derived from the chloroprene rubber" refers to the scaly filler when the raw material CR used in producing the rubber composition of the present invention is a CR containing the scaly filler (FR).

[0020] An example of the scale-like filler (FR) is an anti-blocking agent attached to the surface of commercially available CR. Commercially available CR usually has an anti-blocking agent attached to the surface of the CR to prevent clumps of CR from adhering to each other after production. Examples of the scaly filler (FR) include the same as the specific examples of the scaly filler contained in the rubber composition of the present invention.

[0021] [Scale-like filler pattern] The pattern (combination) of the scaly filler contained in the rubber composition of the present invention may be, for example, (1) If there is only scaly filler (FR), (2) If there is only flake filler (FE), (3) The case where a scaly filler (FR) and a scaly filler (FE) are contained may be mentioned.

[0022] From the viewpoint of achieving better effects of the present invention (particularly elongation at break) and better breaking strength (also referred to as tensile strength at break, the same applies below), the above-mentioned scaly filler preferably contains a scaly filler (FR) and / or a scaly filler (FE), and is more preferably any of the above (1) to (3), even more preferably (1) or (3), and even more preferably (1).

[0023] [Flake filler (FE)] When the above-mentioned scaly filler contains a scaly filler (FR), it is preferable that the scaly filler further contains a scaly filler (FE) from the viewpoint of achieving better effects of the present invention (particularly tear strength). Examples of the scaly filler (FE) include the same as the specific examples of the scaly filler described above. From the viewpoint of achieving better effects of the present invention, the scaly filler (FE) preferably contains at least one selected from the group consisting of talc, mica, and clay.

[0024] An example of the scaly filler (FE) is a scaly filler that is added (post-added) to the chloroprene rubber when producing the rubber composition of the present invention.

[0025] Average diameter of scale-like filler The average diameter of the scaly filler contained in the rubber composition of the present invention is preferably 0.1 to 700 μm, more preferably 1 to 100 μm, from the viewpoint of achieving superior effects of the present invention. The average diameter of the scaly filler can be determined as a volume average diameter by a laser diffraction method using a laser diffraction particle size distribution analyzer.

[0026] Aspect ratio of scale-like filler From the viewpoint of achieving superior effects of the present invention, the aspect ratio (average diameter / thickness) of the scaly filler contained in the rubber composition of the present invention is preferably 5 to 80, more preferably 15 to 70. The thickness of the scaly filler can be determined by observing the scaly filler at 10,000x magnification with a scanning electron microscope (SEM), randomly selecting 10 scaly fillers from the observed field of view, and measuring their thicknesses, and calculating the average value based on the measured values.

[0027] [Scale-like filler content (total content)] The content of the scaly filler contained in the rubber composition of the present invention is more than 0 part by mass and less than 5.0 parts by mass per 100 parts by mass of the chloroprene rubber. In the present invention, the content of the scaly filler contained in the rubber composition of the present invention refers to the total content of the scaly filler contained in the entire rubber composition of the present invention. "100 parts by mass of chloroprene rubber" as the standard for the content of the scaly filler does not include the content of the scaly filler.

[0028] The content (total content) of the scaly filler contained in the rubber composition of the present invention is preferably 0.1 to 3.0 parts by mass, more preferably 0.2 to 2.0 parts by mass, and even more preferably 0.2 to 1.0 parts by mass, per 100 parts by mass of the chloroprene rubber, from the viewpoint of achieving better effects of the present invention (particularly elongation at break). The content (total content) of the scaly filler contained in the rubber composition of the present invention is preferably 0.1 to 4.0 parts by mass, more preferably 0.8 to 2.0 parts by mass, per 100 parts by mass of chloroprene rubber, from the viewpoint of achieving better effects of the present invention (particularly tear strength). Regarding the content of the scale-like filler contained in the rubber composition of the present invention, examples of the patterns of the scale-like filler contained in the rubber composition of the present invention include the above patterns (1) to (3).

[0029] [Amount of scaly filler (FR)] - Pattern (1) above: When only flake filler (FR) is used When the pattern of the scaly filler contained in the rubber composition of the present invention is (1) above, the amount of the scaly filler (FR) (i.e., the total content of the scaly filler contained in the rubber composition of the present invention) is preferably more than 0 parts by mass and less than 2.0 parts by mass, and more preferably 0.1 to 1.0 parts by mass, per 100 parts by mass of the chloroprene rubber, from the viewpoint of achieving better effects of the present invention (particularly elongation at break) and better breaking strength.

[0030] The above pattern (3): When scale-like fillers (FR) and (FE) are included When the pattern of the scaly filler contained in the rubber composition of the present invention is (3) above, the amount of the scaly filler (FR) is preferably more than 0 parts by mass and less than 2.0 parts by mass, and more preferably 0.1 to 1.0 parts by mass, per 100 parts by mass of the chloroprene rubber, from the viewpoint of achieving better effects of the present invention (particularly tear strength).

[0031] [Scale-like filler (FE) content] - Pattern (2) above: When only flake filler (FE) is used When the pattern of the scaly filler (FE) contained in the rubber composition of the present invention is (2) above, the amount of the scaly filler (FR) (i.e., the total content of the scaly filler contained in the rubber composition of the present invention) is preferably 0.1 to 3.0 parts by mass, more preferably 0.3 to 1.0 parts by mass, per 100 parts by mass of the chloroprene-based rubber, from the viewpoint of achieving better effects of the present invention.

[0032] The above pattern (3): When scale-like fillers (FR) and (FE) are included When the pattern of the scaly filler (FE) contained in the rubber composition of the present invention is (3) above, the amount of the scaly filler (FR) is preferably 0.1 to 3.0 parts by mass, more preferably 0.3 to 2.0 parts by mass, and even more preferably 0.3 to 0.8 parts by mass per 100 parts by mass of the chloroprene rubber, from the viewpoint of achieving better effects of the present invention (particularly tear strength). However, in the present invention, the total content of the scaly filler (FR) and the scaly filler (FE) is less than 5 parts by mass per 100 parts by mass of the chloroprene rubber.

[0033] (additives) The rubber composition of the present invention may further contain additives. Examples of additives include plasticizers such as magnesium oxide, carbon black, stearic acid, and process oil, crosslinking agents such as zinc oxide and sulfur, crosslinking accelerators, and antioxidants. The type and content of the additives can be appropriately selected.

[0034] Carbon black The carbon black that can be further contained in the rubber composition of the present invention is not particularly limited, and examples thereof include conventionally known carbon blacks. When the rubber composition of the present invention further contains carbon black, the content of carbon black is preferably 10 to 100 parts by mass based on 100 parts by mass of the chloroprene rubber.

[0035] [Manufacturing method] The method for producing the rubber composition of the present invention is not particularly limited. For example, a method of mixing CR having a scaly filler (FR) attached thereto as an anti-blocking agent with the above-mentioned additives; A method of mixing CR containing no flaky filler, a flaky filler (FE), and the above-mentioned additives (in this case, the flaky filler (FE) is added to the CR later); One method is to mix CR to which a scaly filler (FR) is attached as an anti-sticking agent, the scaly filler (FE), and the above-mentioned additives (in this case, the scaly filler (FE) is also added to the CR later).

[0036] [Application] The rubber composition of the present invention can be used for, for example, hoses, conveyor belts, tires, etc.

[0037] [hose] The hose of the present invention is a hose formed using the rubber composition of the present invention. The hose of the present invention is formed using the rubber composition of the present invention, and therefore has excellent elongation at break and tear strength while maintaining excellent oil resistance. The rubber composition used in the hose of the present invention is not particularly limited as long as it is the rubber composition of the present invention. There is no particular limitation on which rubber component of the hose of the present invention the rubber composition is applied to.

[0038] Examples of the rubber layers that the hose of the present invention has include an inner layer rubber, an outer layer rubber, and an interlayer rubber. The hose of the present invention has an inner layer rubber, and one of the preferred embodiments is one in which the inner layer rubber is formed using the rubber composition of the present invention. In addition, one preferred embodiment of the hose of the present invention has an interlayer rubber, and the interlayer rubber is formed using the rubber composition of the present invention. The hose of the present invention can have one or more interlayer rubber layers. When the hose of the present invention has an outer layer rubber, the rubber composition forming the outer layer rubber is not particularly limited. For example, conventionally known rubber compositions can be used. When the hose of the present invention has multiple rubber layers, a reinforcing layer may be provided between the rubber layers. When the interlayer rubber and the reinforcing layer are adjacent to each other, the adjacent interlayer rubber and the reinforcing layer are sometimes collectively referred to as an intermediate rubber reinforcing layer. The intermediate rubber reinforcing layer may be one layer or multiple layers.

[0039] Here, an example of a preferred embodiment of the hose of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited to the accompanying drawings. FIG. 1 is a perspective view showing an example of a hose of the present invention with each layer cut away. As shown in FIG. 1, a hose 1 has an inner layer rubber 2 as an inner tube, and on top of that has a reinforcing layer 3 and an outer layer rubber 4 as an outer tube.

[0040] FIG. 2 is a perspective view showing another example of a hose of the present invention with each layer cut away. As shown in FIG. 2, hose 5 has inner layer rubber 10 as the innermost layer, outer layer rubber 23 as the outermost layer, and interlayer rubbers 11, 13, 15, 17, 19, 21 and reinforcing layers 12, 14, 16, 18, 20, 22 alternately between inner layer rubber 10 and outer layer rubber 23.

[0041] Next, the rubber layers (inner rubber layer, outer rubber layer, or interlayer rubber) and reinforcing layers that constitute the hose of the present invention will be described in detail. <Rubber layer> The thickness of the inner rubber layer is preferably 0.2 to 4.0 mm, and more preferably 0.4 to 2.5 mm. The thickness of the outer rubber layer is preferably 0.2 to 4.0 mm, and more preferably 0.4 to 2.5 mm. The thickness of the interlayer rubber is preferably 0.2 to 0.7 mm, and more preferably 0.3 to 0.5 mm.

[0042] (reinforcement layer) The reinforcing layer is a layer provided from the viewpoint of maintaining strength, and may be provided, for example, on the outside of a rubber layer (for example, on the outside of at least one rubber layer selected from the group consisting of an inner layer rubber, an interlayer rubber, and an outer layer rubber). In the present invention, the reinforcing layer may be formed in a blade shape or a spiral shape. The material for forming the reinforcing layer is not particularly limited, and for example, conventionally known metal wires and various fiber materials (nylon, polyester, etc.) can be used.

[0043] (Other rubber layers, resin layers) The hose of the present invention may further have another rubber layer or resin layer between the rubber layer and the reinforcing layer. The rubber material for forming the other rubber layer is not particularly limited. The resin material for forming the resin layer is not particularly limited, and for example, conventionally known polyamide resins, polyester resins, etc. can be used.

[0044] (Hose manufacturing method) The method for producing the hose of the present invention is not particularly limited, and any conventionally known method can be used. Specifically, for example, an inner rubber layer, one or more intermediate rubber reinforcing layers, and an outer rubber layer are laminated in this order on a mandrel, and then the laminate is covered with nylon cloth or the like, and the laminate thus covered is then vulcanized by steam vulcanization, oven vulcanization (hot air vulcanization), or warm water vulcanization at 140 to 190°C for 30 to 180 minutes to achieve vulcanization bonding. After vulcanization, the nylon cloth or the like can be removed from the hose produced as described above.

[0045] (Use of hose) The hose of the present invention can be used, for example, as a hydraulic hose, a hose for transporting refrigerants, a marine hose, etc. The hose of the present invention can be used, for example, as a hose for passing oil. [Example]

[0046] The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

[0047] <Production of Rubber Composition> Each rubber composition was produced by mixing the components in the composition (parts by mass) shown in Table 1 below with a stirrer.

[0048] <Evaluation> The rubber compositions produced as described above were subjected to the following evaluations, and the results are shown in Table 1.

[0049] ·Normal physical properties (Test piece) Each rubber composition produced as described above was vulcanized for 45 minutes using a press molding machine under conditions of 148°C and a surface pressure of 3.0 MPa to produce a 2 mm thick vulcanized sheet. JIS No. 3 dumbbell-shaped test pieces were punched out from this sheet, and the test pieces were used to evaluate the normal physical properties (tensile test and immersion test described below).

[0050] (Tensile test) Using the above test pieces, a tensile test was carried out in accordance with JIS K6251:2010 under conditions of a tensile speed of 500 mm / min and 23°C, and the breaking strength (Tb) [MPa] and elongation at break (Eb) [%] were measured.

[0051] (Evaluation criteria for breaking strength Tb) In the present invention, when the breaking strength (Tb) is 12.0 MPa or more, the breaking strength is excellent and is preferable. In the above case, the breaking strength was evaluated as being better as the breaking strength was greater than 12.0 MPa.

[0052] (Evaluation criteria for elongation at break Eb) In the present invention, when the elongation at break (Eb) was 350% or more, the elongation at break was evaluated as excellent and was marked with "◯." In the above case, the elongation at break greater than 350% was evaluated as being more excellent. On the other hand, when the elongation at break was less than 350%, the elongation at break was evaluated as poor and was marked with "X".

[0053] (Evaluation of tearing force Ts) Each rubber composition produced as described above was vulcanized for 45 minutes using a press molding machine under conditions of 148°C and a surface pressure of 3.0 MPa to produce a 2 mm thick vulcanized sheet. Crescent-shaped test pieces were punched out from this sheet, and a tear test was performed at a tensile speed of 500 mm / min in accordance with JIS K6252-1:2015 to measure the tear strength (tear force Ts) [kN / m] at room temperature (23°C).

[0054] (Evaluation criteria for tear strength) In the present invention, when the tear strength is 25.0 kN / m or more, the tear strength is considered to be excellent. Specifically, when the tear strength was 26.5 kN / m or more, the tear strength was evaluated as being the best, and this was marked with "Excellent". When the tear strength was 26.0 kN / m or more and less than 26.5 kN / m, the tear strength was evaluated as being very excellent, and this was indicated by "◯". When the tear strength was 25.0 kN / m or more and less than 26.0 kN / m, the tear strength was evaluated as being slightly excellent, and this was indicated by "Fair." On the other hand, when the tear strength was less than 25.0 kN / m, the tear strength was evaluated as poor and was marked with "X".

[0055] (Oil resistance) Immersion test Each test piece (initial test piece) prepared as described above was subjected to an immersion test in which it was immersed in a mixed solution of toluene / isooctane = 60 / 40 (mass ratio) at room temperature (23°C) for 168 hours, and test pieces after the immersion test were obtained. The volume of each test piece was measured initially and after the immersion test.

[0056] Volume change rate (VC) The initial volume of the test piece and the volume of the test piece after the immersion test measured as described above were applied to the following formula to calculate the rate of decrease in breaking strength at break before and after the immersion test. Volume change rate (%) = [(volume of test piece after immersion test - initial volume of test piece)] / volume of initial specimen] × 100

[0057] ·Evaluation criteria for oil resistance The evaluation criteria for oil resistance are as follows: In the present invention, when the volume change rate was 1.0% or less, the oil resistance was evaluated as excellent. In the above case, the smaller the volume change rate was below 1.0%, the more excellent the oil resistance was evaluated. On the other hand, when the volume change rate exceeded 1.0%, the oil resistance was evaluated as poor.

[0058] [Table 1]

[0059] [Table 2]

[0060] The details of each component shown in Table 1 are as follows: (chloroprene rubber) CR1: Chloroprene rubber obtained by removing the flake filler (FR) from "Denka Chloroprene S-41" manufactured by Denka Co., Ltd. The above chloroprene rubber is unmodified CR.

[0061] CR2: "Denka Chloroprene S-41" manufactured by Denka Co., Ltd. Chloroprene rubber containing a scaly filler (FR). The chloroprene rubber is unmodified CR. The amount of scaly filler (FR) contained in CR2 is 0.5 parts by mass per 100 parts by mass of chloroprene rubber. The scaly filler (FR) contains talc. In Table 1, "CR amount of CR2" indicates the amount of chloroprene rubber (excluding the above-mentioned flake filler (FR)) in the above-mentioned product used in each example. Furthermore, "Amount of flaky filler (FR) in CR2" in Table 1 indicates the amount of flaky filler in the above product used in each example. The sum of the "CR amount of CR2" and the "amount of scaly filler (FR) of CR2" is the amount of the product used in each example.

[0062] Magnesium oxide: Kyowamag 150, manufactured by Kyowa Chemical Industry Co., Ltd. Carbon black (SRF): SRF grade carbon black (product name "Asahi 50", manufactured by Asahi Carbon Co., Ltd.)

[0063] (scale-like filler) The following flake fillers 1 and 2 are flake fillers (FE). Flake filler (FE) 1: Talc. Product name: "Mistron Vapor", manufactured by Imerys. Flake filler (FE) 2: Mica. Product name: "A-21S", manufactured by Yamaguchi Mica Co., Ltd.

[0064] Stearic acid: Product name "Industrial Stearic Acid N", manufactured by Chiba Fatty Acid Co., Ltd. Process oil: Product name: Morex H22, manufactured by JX Nippon Oil & Energy Corporation Zinc oxide: Product name "Zinc oxide type 3", manufactured by Seido Chemical Industry Co., Ltd. Sulfur: Product name "Oil-treated sulfur", manufactured by Hosoi Chemical Industry Co., Ltd. Vulcanization accelerator 1 TMTM: Tetramethylthiuram monosulfide. Product name: Suncerer TS-G, manufactured by Sanshin Chemical Industry Co., Ltd. Vulcanization accelerator 2 DG: 1,3-diphenylguanidine. Product name: "Suncerer DG", manufactured by Sanshin Chemical Industry Co., Ltd.

[0065] As is clear from the results shown in Table 1, Comparative Example 1, which did not contain any flaky filler, had poor tear strength and oil resistance. Comparative Examples 2, 3 and 4, in which the content of the scaly filler exceeded the predetermined range, exhibited poor elongation at break.

[0066] In contrast, the rubber composition of the present invention maintained excellent oil resistance while exhibiting excellent elongation at break and tear strength.

[0067] In the present invention, even when the total content of the scaly filler is less than 5.0 parts by mass, excellent elongation at break and tear strength are achieved while maintaining excellent oil resistance, which was an unexpected effect.

[0068] In particular, from the results of Examples 1, 5, and 6, when the rubber composition of the present invention contains only a scaly filler (FR) as the scaly filler, even if the content of the scaly filler (FR) is very small, at 1.0 mass part or less per 100 mass parts of CR, the excellent tear strength, better elongation at break, and excellent breaking strength (especially the excellent tear strength compared to Comparative Example 1) were unexpected effects.

[0069] Furthermore, from the results of Example 2, when the rubber composition of the present invention contains a scaly filler (FR) and a scaly filler (FE) as the scaly filler, even if the total content of the scaly filler (FR) and the scaly filler (FE) is as very small as 2.0 parts by mass or less per 100 parts by mass of CR, the tear strength and elongation at break are superior, which was an unexpected effect. [Explanation of symbols]

[0070] 1, 5: Hose 2, 10: Inner rubber 3, 12, 14, 16, 18, 20, 22: Reinforcement layers 4, 23: Outer rubber 11, 13, 15, 17, 19, 21: Interlayer rubber

Claims

1. A rubber composition used to form a hose, comprising a chloroprene-based rubber and a scaly filler, the content of the scaly filler being more than 0 parts by mass and not more than 2.0 parts by mass per 100 parts by mass of the chloroprene-based rubber, and the scaly filler including at least one member selected from the group consisting of talc, mica, and clay.

2. The rubber composition according to claim 1 , wherein the scaly filler comprises a scaly filler (FR) derived from the chloroprene rubber.

3. A rubber composition as described in claim 1 or 2, wherein the content of the chloroprene-based rubber is 80 mass% or more and 100 mass% or less of the total rubber components.

4. A hose formed using the rubber composition according to any one of claims 1 to 3.

Images