Rubber particles, method for producing rubber particles, resin composition, and molded article

Abstract

The present invention provides rubber particles that are less likely to adhere to each other, a method for producing rubber particles, and a resin composition and molded article containing the rubber particles. [Solution] A rubber component and an organic compound other than the rubber component, and / or an inorganic compound, with a volume of 25 cm³. 3 The rubber particles are as follows:

Description

[Technical Field]

[0001] This disclosure relates to rubber particles, a method for producing rubber particles, a resin composition, and a molded article. [Background technology]

[0002] One known method for improving the impact resistance of resin materials is to add rubber particles using a twin-screw extruder or the like.

[0003] It is known that rubber particles can adhere to each other due to cold flow. When rubber particles adhere to each other in feeders used in twin-screw extruders, etc., it can become difficult to stably supply them to the extruder. Although research is underway on methods to suppress the adhesion of rubber particles (see, for example, Patent Document 1), conventional methods have not been sufficiently effective in suppressing adhesion. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2000-52336 [Overview of the project] [Problems that the invention aims to solve]

[0005] This disclosure aims to provide rubber particles that are less likely to adhere to each other, a method for producing rubber particles, and a resin composition and molded article containing said rubber particles. [Means for solving the problem]

[0006] This disclosure (1) contains a rubber component and It contains organic compounds other than the aforementioned rubber components, and / or inorganic compounds. Volume is 25 cm³ 3 The following are rubber particles.

[0007] Disclosure (2) is the rubber particle according to Disclosure (1), wherein the inorganic compound is a polyvalent metal salt.

[0008] Disclosure (3) is the rubber particle according to Disclosure (2), wherein the cation constituting the polyvalent metal salt is an alkaline earth metal ion.

[0009] Disclosure (4) is the rubber particle according to Disclosure (3), wherein the alkaline earth metal ion is a calcium ion.

[0010] Disclosure (5) is a rubber particle in any combination of any of Disclosures (2) to (4) wherein the anion constituting the polyvalent metal salt is a halide ion.

[0011] Disclosure (6) is the rubber particle according to Disclosure (5), wherein the halide ion is a chloride ion.

[0012] Disclosure (7) is the rubber particle according to Disclosure (6), wherein the polyvalent metal salt is calcium chloride.

[0013] Disclosure (8) is a rubber particle in any combination of the organic compound with any of Disclosures (1) to (7), wherein the organic compound is a compound having a hydroxyl group and / or a carboxyl group.

[0014] The present disclosure (9) is the rubber particle according to the present disclosure (8), wherein the organic compound is a polysaccharide.

[0015] Disclosure (10) is the rubber particle according to Disclosure (9), wherein the polysaccharide is chitosan.

[0016] Disclosure (11) is a rubber particle in any combination with any of Disclosures (1) to (10), wherein the rubber component is a diene rubber.

[0017] The present disclosure (12) provides the rubber particles according to the present disclosure (11), wherein the diene rubber is at least one selected from the group consisting of natural rubber, nitrile rubber, hydrogenated nitrile rubber, butadiene rubber, isoprene rubber, cyclopentene rubber, styrene-butadiene rubber, butyl rubber, and ethylene-propylene-diene rubber.

[0018] The present disclosure (13) provides the rubber particles according to the present disclosure (12), wherein the diene rubber is natural rubber.

[0019] The present disclosure (14) provides rubber particles in any combination with any one of the present disclosures (1) to (13), wherein the rubber particles have a heterogeneous structure.

[0020] The present disclosure (15) provides rubber particles in any combination with any one of the present disclosures (1) to (14), wherein an aspect ratio of the rubber particles is from 1.1 to 10.

[0021] The present disclosure (16) provides rubber particles in any combination with any one of the present disclosures (1) to (15), wherein a content of the organic compound and / or the inorganic compound relative to the rubber component is 0.05 to 2.5 mass%.

[0022] The present disclosure (17) provides the rubber particles according to the present disclosure (16), wherein a content of the organic compound and / or the inorganic compound relative to the rubber component is 0.8 to 2.1 mass%.

[0023] The present disclosure (18) provides rubber particles in any combination with any one of the present disclosures (1) to (17), wherein a protein content of the rubber particles is 1.5 mass% or less.

[0024] The present disclosure (19) provides rubber particles in any combination with any one of the present disclosures (1) to (18), wherein when 600 g of the rubber particles are filled into a weight feeder and discharged under a condition of 10 g / min for 30 minutes, a discharge error is less than ±20%.

[0025] The present disclosure (20) provides a method for producing rubber particles, comprising a step of dropping rubber latex into a curing liquid to obtain a cured product.

[0026] This disclosure (21) is a method for producing rubber particles according to this disclosure (20), which includes a step of vibrating-drying the cured product. This is the manufacturing method.

[0027] The present disclosure (22) is a method for producing rubber particles according to the present disclosure (20) or (21), wherein the curing liquid contains an emulsifier.

[0028] The present disclosure (23) is a method for producing rubber particles in any combination of the present disclosures (20) to (22), wherein the solid content in the rubber latex is 50 to 70% by mass.

[0029] The present disclosure (24) is a method for producing rubber particles in any combination of the present disclosures (20) to (23), wherein the content of the curing agent in the curing liquid is 0.8 to 12% by mass.

[0030] The present disclosure (25) is a method for producing rubber particles in any combination of the present disclosures (20) to (24), wherein the dropping rate of the rubber latex is 10 to 30% by mass / min relative to the amount of the curing liquid.

[0031] Disclosure (26) is a resin composition comprising rubber particles in any combination with any of Disclosures (1) to (19).

[0032] Disclosure (27) is a molded article comprising rubber particles in any combination with any of Disclosures (1) to (19). [Effects of the Invention]

[0033] According to this disclosure, it is possible to provide rubber particles that are difficult to adhere to each other, a method for producing rubber particles, and a resin composition and molded article containing said rubber particles. [Modes for carrying out the invention]

[0034] The following provides a detailed explanation of this disclosure.

[0035] <rubber particles> The rubber particles of the present disclosure contain a rubber component, an organic compound other than the rubber component, and / or an inorganic compound, and have a volume of 25 cm 3 or less.

[0036] The rubber particles of the present disclosure contain an organic compound and / or an inorganic compound, and have a volume of 25 cm 3 or less, whereby the occurrence of mutual adhesion can be suppressed.

[0037] The volume of the rubber particles of the present disclosure is 25 cm 3 or less, preferably 10 cm 3 or less, more preferably 5 cm 3 or less, still more preferably 1 cm 3 or less, particularly preferably 0.5 cm 3 or less, and preferably 0.01 cm 3 or more, more preferably 0.1 cm 3 or more, still more preferably 0.15 cm 3 or more. The volume of the rubber particles is calculated by observing the rubber particles with a 3D scanner-type three-dimensional measuring machine "VL Series" (manufactured by KEYENCE CORPORATION), measuring the volume of each of 100 randomly extracted particles one by one, and taking the average value thereof as the volume.

[0038] Rubber particles of the present disclosure having a volume of 25 cm 3 or less are obtained, for example, by the method for producing rubber particles of the present disclosure described later. In a conventional production method in which rubber latex is cured with an acid to obtain rubber particles, it is generally difficult to obtain rubber particles having a volume of 25 cm 3 or less.

[0039] The organic compound and the inorganic compound are preferably usable as a curing agent for rubber latex. The organic compound and the inorganic compound may be used alone, or two or more thereof may be used in combination.

[0040] The organic compound is not particularly limited as long as it is not a rubber component, but it is preferably a compound having a functional group capable of forming ionic bonds. Examples of functional groups capable of forming ionic bonds include carboxyl groups, amino groups, hydroxyl groups, sulfonic acid groups, phosphonic acid groups, imidazole groups, pyridine groups, thiol groups, amide groups, and guanidine groups. The organic compound may have one of these functional groups or two or more. Among these, it is preferable that it has a hydroxyl group and / or a carboxyl group.

[0041] Compounds having hydroxyl groups and / or carboxyl groups include polysaccharides such as chitosan, chitin, cellulose, hyaluronic acid, peptidoglycan, starch, agar, pectin, xanthan gum, and carrageenan; monosaccharides such as glucose and fructose; and oligosaccharides (sugars in which two or more but less than ten monosaccharides are linked together) such as sucrose, maltose, and trehalose. Compounds other than sugars include alcohols, carboxylic acids, and hydroxy acids. Among these, polysaccharides are preferred.

[0042] Examples of polysaccharides include the aforementioned chitosan and chitin, but chitosan is preferred. Furthermore, chitosan is available in various forms, including low molecular weight / low viscosity (viscosity: less than 10 MPa·s), medium molecular weight / medium viscosity (viscosity: 10 MPa·s to less than 100 MPa·s), and high molecular weight / high viscosity (viscosity: 100 MPa·s or more). However, high molecular weight / high viscosity products are preferred because they provide a better anti-adhesion effect. The viscosity of chitosan was measured at 25°C using a VISCO Package B (manufactured by ATAGO) after mixing 30g of chitosan powder with 1L of 80°C hot water, adding the same amount of citric acid powder as the chitosan powder, and stirring.

[0043] Polysaccharides are preferably used in combination with an acid. This improves the water solubility of the polysaccharides and enhances the anti-adhesion effect. Hydroxy acids such as citric acid are preferred as the acid, and citric acid is more preferred. Acids may be used individually or in combination of two or more types.

[0044] The mass ratio of polysaccharides to acid (polysaccharides:acid) is preferably 20:80 to 80:20, more preferably 30:70 to 70:30, even more preferably 40:60 to 60:40, and particularly preferably 50:50.

[0045] The inorganic compound is not particularly limited, but it is preferably a polyvalent metal salt.

[0046] Examples of cations (metal ions) that constitute polyvalent metal salts include alkaline earth metal ions and trivalent metal ions. Among these, alkaline earth metal ions are preferred, beryllium ions, calcium ions, magnesium ions, and barium ions are more preferred, and calcium ions are even more preferred.

[0047] Anions that make up polyvalent metal salts include halide ions and oxide ions (O 2- ), sulfide ions (S 2- ), sulfate ions (SO4 2- ), carbonate ions (CO3 2- ), phosphate ion (PO4 3- Examples include the following. Among these, halide ions are preferred, chloride ions, bromide ions, and fluoride ions are more preferred, and chloride ions are even more preferred.

[0048] The polyvalent metal salt is preferably composed of alkaline earth metal ions and halide ions, and more preferably composed of calcium ions and chloride ions, i.e., calcium chloride.

[0049] The content of organic compounds and / or inorganic compounds in the rubber component is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.8% by mass or more, even more preferably 1.5% by mass or more, even more preferably 1.8% by mass or more, particularly preferably 1.9% by mass or more, and also preferably 2.5% by mass or less, more preferably 2.3% by mass or less, and even more preferably 2.1% by mass or less.

[0050] The rubber component is not particularly limited, but a diene-based rubber is preferred. The rubber component may be used alone or in combination of two or more types.

[0051] The diene rubber is preferably at least one selected from the group consisting of natural rubber, nitrile rubber, hydrogenated nitrile rubber, butadiene rubber, isoprene rubber, cyclopentene rubber, styrene-butadiene rubber, butyl rubber, and ethylene-propylene-diene rubber, and is more preferably natural rubber.

[0052] In the rubber particles of this disclosure, the total content of rubber components, organic compounds, and inorganic compounds is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, particularly preferably 99% by mass or more, and may also be 100% by mass.

[0053] The rubber particles of this disclosure preferably have a non-uniform structure. This results in a better anti-adhesion effect. In this specification, a non-uniform structure of rubber particles means that the aspect ratio of the rubber particles is not equal to 1. Furthermore, the aspect ratio is determined by observing rubber particles with a scanning electron microscope (SEM), processing images of 100 randomly selected particles, and averaging the ratio of their major axis to minor axis.

[0054] In terms of achieving a better adhesion suppression effect, the rubber particles of this disclosure preferably have an aspect ratio of 1.1 or higher, more preferably 1.2 or higher, even more preferably 1.5 or higher, and also preferably 10 or lower, more preferably 6 or lower, even more preferably 4 or lower, even more preferably 2 or lower, and particularly preferably 1.7 or lower.

[0055] The rubber particles of this disclosure preferably have a low protein content. This results in a good suppression effect on allergies and other symptoms caused by proteins. In the rubber particles of this disclosure, the protein content is preferably 1.5% by mass or less, more preferably 1.0% by mass or less, even more preferably 0.5% by mass or less, even more preferably 0.1% by mass or less, and particularly preferably 0.05% by mass or less. The lower limit is not particularly limited and may be 0% by mass, but is usually around 0.001% by mass or more, and may be 0.005% by mass or more. The protein content can be calculated using the modified Lowry method (ISO 12243:2003).

[0056] Furthermore, the rubber particles described herein may or may not undergo a treatment to remove proteins.

[0057] Because the rubber particles of this disclosure are less prone to adhesion, errors when discharged from a weight feeder can be reduced. When 600 g of the rubber particles of this disclosure are filled into a weight feeder and discharged for 30 minutes at a rate of 10 g / min, the error is preferably less than ±20%, more preferably ±15% or less, and even more preferably ±5% or less.

[0058] <Method for manufacturing rubber particles> The rubber particles of this disclosure are obtained, for example, by a manufacturing method that includes the step of dropping rubber latex into a curing solution to obtain a cured product. This disclosure also relates to a method for producing rubber particles, which includes a step (step 1) of dropping rubber latex into a curing solution to obtain a cured product.

[0059] By dropping rubber latex into a curing solution, a cured product (rubber particles) with a small volume and low adhesion is obtained. This is thought to be because the negative charge of the rubber in the rubber latex reacts with the positive charge of the curing agent in the curing solution, creating ionic bonds that form a film of the curing agent on the surface of the rubber particles.

[0060] The rubber latex may be natural rubber latex or synthetic rubber latex, but natural rubber latex is preferred. As the synthetic rubber in the synthetic rubber latex, for example, any of the above-mentioned diene-based rubbers other than natural rubber can be used. Rubber latex may be used individually or in combination of two or more types.

[0061] Examples of the above-mentioned natural rubber latex include DYNATHAI LATZ, Resitex TRH-70, and Concentrated Latex 60% DRC. Examples of nitrile rubber latex include Nipol 1551, Nipol LX513, Nipol LX550, and Nipol LX560. Examples of hydrogenated nitrile rubber latex include Zetpol 2230LX. Examples of butadiene rubber latex include Nipol LX111A2 and Nipol LX111NF. Examples of styrene-butadiene rubber latex include Nipol 2507H, Nipol LX209, Nipol LX418C, SBL 0561, SBL 0533, and SBL 2527A.

[0062] The solid content (rubber content) in the rubber latex is preferably 40% by mass or more, more preferably 50% by mass or more, even more preferably 55% by mass or more, and also preferably 90% by mass or less, more preferably 80% by mass or less, and even more preferably 70% by mass or less.

[0063] The dropping rate of the rubber latex is preferably 1% by mass / min or more, more preferably 3% by mass / min or more, even more preferably 5% by mass / min or more, and particularly preferably 10% by mass / min or more, relative to the amount of curing solution, and also preferably 50% by mass / min or less, more preferably 40% by mass / min or less, and even more preferably 30% by mass / min or less.

[0064] The solvent in the rubber latex curing solution is not particularly limited and may be either water or an organic solvent, but water is usually used.

[0065] The above-mentioned organic and inorganic compounds can be used as curing agents in the curing solution.

[0066] The content of the curing agent in the curing solution is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 0.8% by mass or more, and also preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 12% by mass or less.

[0067] The curing solution preferably contains an emulsifier. This results in rubber particles with a small aspect ratio and a structure closer to a sphere, which has effects such as making it easier to stably supply rubber particles to the extruder.

[0068] The emulsifier is not particularly limited, and common types such as anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants can be used. Furthermore, the emulsifier may be a reactive or non-reactive emulsifier. The emulsifier may be used alone or in combination of two or more types.

[0069] The emulsifier content in the curing solution is preferably 0.001% by mass or more, more preferably 0.005% by mass or more, even more preferably 0.01% by mass or more, and also preferably 3% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less, and particularly preferably 0.5% by mass or less.

[0070] The manufacturing method disclosed herein may include a step (step 2) in which the cured material is again immersed in the curing solution after step 1. Step 2 improves the adhesion suppression effect. This effect is thought to be brought about by the formation of a more uniform curing agent film on the surface of the rubber particles.

[0071] The curing solution used in step 2 can be the same as that used in step 1. The same curing solution may be used in steps 1 and 2, or different curing solutions may be used. When different curing solutions are used, it is preferable that one curing solution in step 1 and 2 uses an organic compound as the curing agent, and the other curing solution uses an inorganic compound as the curing agent. It is more preferable that the curing solution in step 2 uses an organic compound as the curing agent, as this provides a better anti-mutual adhesion effect.

[0072] The cured product after step 1 or step 2 is usually removed from the curing solution, cleaned in pure water using ultrasonic cleaning or other methods as needed, and then dried. The drying method is not particularly limited and may be left to stand, but vibration drying is preferred. That is, the manufacturing method of the present disclosure preferably includes a step (step 3) of vibration drying the cured product. Step 3 suppresses the adhesion of rubber particles during drying. Furthermore, from the standpoint of suppressing rubber deterioration, it is preferable to dry the rubber under vacuum or in an inert gas while heating it in step 3.

[0073] The method of vibration drying is not particularly limited and can be carried out using a general-purpose vibration dryer. The conditions for vibration drying are not particularly limited, but the drying temperature is preferably 20°C or higher, more preferably 40°C or higher, even more preferably 50°C or higher, and also preferably 150°C or lower, more preferably 100°C or lower, and even more preferably 80°C or lower, from the viewpoint of suppressing deterioration of rubber particles and shortening the drying time. The drying time is preferably 1 to 24 hours, and more preferably 1 to 8 hours.

[0074] Furthermore, the preferred embodiments described for the rubber particles of this disclosure are also applicable to rubber particles obtained by the manufacturing methods of this disclosure.

[0075] <Resin composition> The resin composition of this disclosure comprises rubber particles of this disclosure.

[0076] The resin contained in the resin composition of this disclosure is not particularly limited, and general resins such as fluororesins, super engineering plastics, engineering plastics, and olefin resins can be used.

[0077] The resin compositions of this disclosure may further contain other components such as additives. Examples of other components include fillers such as glass fibers, glass powder, asbestos fibers, cellulose fibers, and carbon fibers, as well as reinforcing agents, stabilizers, lubricants, pigments, and flame retardants. Furthermore, the resin composition of this disclosure may contain rubber particles other than the rubber particles of this disclosure.

[0078] <Molded body> The molded articles of this disclosure include rubber particles of this disclosure.

[0079] The molded articles of this disclosure can be obtained, for example, by molding the resin composition of this disclosure. The molding method is not particularly limited, and conventional methods such as injection molding, extrusion molding, blow molding, inflation molding, and vacuum / pressure molding can be used.

[0080] The applications of the molded articles of this disclosure are not particularly limited. For example, electrical and electronic components such as connectors, sockets, relay components, coil bobbins, optical pickups, oscillators, printed circuit boards, and computer-related components; semiconductor manufacturing process-related components such as IC trays and wafer carriers; household electrical appliance components such as VTRs, televisions, irons, air conditioners, stereos, vacuum cleaners, refrigerators, rice cookers, and lighting fixtures; lighting fixture components such as lamp reflectors and lamp holders; audio product components such as compact discs and speakers; communication equipment components such as ferrules for optical cables, telephone components, facsimile components, and modems; copier-related components such as separation claws and heater holders; and impellers. It can be used in a wide range of applications, including mechanical parts such as fans, gears, bearings, motor parts and cases, automotive mechanical parts, engine parts, engine compartment parts, electrical parts, interior parts, cooking utensils such as microwave cooking pots and heat-resistant tableware, thermal insulation and soundproofing materials such as flooring and wall materials, building materials such as beams and columns, roofing materials, or civil engineering and construction materials, aircraft, spacecraft and space equipment parts, radiation facility components such as nuclear reactors, marine facility components, cleaning jigs, optical instrument parts, valves, pipes, nozzles, filters, membranes, medical equipment parts and medical materials, sensor parts, and sanitary fixtures.

[0081] Although embodiments have been described above, it should be understood that various modifications to the form and details are possible without departing from the spirit and scope of the claims. [Examples]

[0082] The present disclosure will now be further described with reference to examples, but the present disclosure is not limited to these examples.

[0083] The materials used in the examples are as follows: <Rubber latex> Natural rubber latex (DYNATHAI LATZ) (Solid content: 60% by mass) <Hardening agent> Calcium chloride: Manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Chitosan: Chitosan FH-80 manufactured by Tamagoya Co., Ltd. (high molecular weight, high viscosity product, viscosity: 100 MPa·s) <Other> Citric acid: SAVE Citric Acid manufactured by SING Co., Ltd. Emulsifier (detergent): Kyukyutto (non-reactive emulsifier) ​​manufactured by Kao Corporation.

[0084] Examples 1-6 Natural rubber latex was added dropwise to the curing solution shown in Table 1 (368 g, solvent: water) to obtain a cured product. The dropping rate was 12% by mass / min relative to the amount of curing solution. Next, the cured material was removed from the curing solution and ultrasonically washed three times in pure water for 5 minutes each time. Next, the cured material after washing was removed from the pure water and vibrated and dried at 60°C for 18 hours to prepare rubber particles.

[0085] Examples 7-12 Natural rubber latex was added dropwise to the first curing solution (368 g, solvent: water) shown in Table 2 to obtain a cured product. The dropping rate was 12% by mass / min relative to the amount of curing solution. Next, the cured material was removed from the curing solution and placed in the second curing solution (300g, solvent: water) shown in Table 2. The rubber particles were prepared using the same method as in Examples 1-6.

[0086] Comparative Example 1 After obtaining a lump of rubber by vacuum-drying natural rubber latex at 60°C for 18 hours, the lump was then processed to a volume of 0.22 cm³. 3 The material was then cut to an aspect ratio of 1.3 to obtain rubber particles.

[0087] Comparative Example 2 After obtaining a rubber block by vacuum-drying natural rubber latex at 60°C for 18 hours, the block was then processed to a volume of 0.24 cm³. 3 The material was then cut to an aspect ratio of 1.5 to obtain rubber particles. Next, polyethylene resin powder (Flowsen, manufactured by Sumitomo Seika Co., Ltd.), used as dusting powder, was mixed in at a concentration of 5% by mass relative to the rubber particles. The amount of polyethylene resin powder adhering to the rubber particles was calculated from the change in mass before and after adhesion.

[0088] The rubber particles obtained above were evaluated using the following method.

[0089] <Amount of hardener> Calcium chloride was measured using inductively coupled plasma mass spectrometry (ICP-MS). Chitosan was calculated from the nitrogen content obtained from CHN elemental analysis. The values ​​in the table represent the content relative to the rubber component.

[0090] <Amount of protein> The calculation was performed using the following method, referencing the improved Lowry method (ISO 12243:2003). The sample obtained by molding rubber particles was cut to a thickness of 0.5 mm, and 0.5 g was immersed in 3 ml of pH 7.4 phosphate buffer and shaken at 40°C for 6 hours to extract the protein. 0.5 ml of protein assay reagent A and 4.0 ml of protein assay reagent B were added to 1 ml of the extract and shaken for 15 minutes. Subsequently, the absorbance at 750 nm was measured using a spectrophotometer, and the eluted protein concentration of the extract was determined from a calibration curve using bovine γ-globulin. The amount of eluted protein was then calculated using the following formula. Elution protein mass (μg / g) = [C (μg / mL) × 3 (mL)] / [W (g)] C: Concentration of eluted proteins in the extract W: Mass of the sample piece

[0091] <Volume> The particles were observed using a 3D scanner-type three-dimensional measuring machine "VL series" (manufactured by Keyence Corporation). The volume of each of 100 randomly selected particles was measured, and the average value of these measurements was used as the volume for calculation.

[0092] <Aspect Ratio> The rubber particles were observed using a scanning electron microscope (SEM), and images were processed on 100 randomly selected particles. The ratio of the major axis to the minor axis was then calculated from the average of these images.

[0093] <Evaluation of compatibility> The error when 600g of rubber particles were filled into a weight feeder and discharged at a rate of 10g / min for 30 minutes was evaluated according to the following criteria. ○: Error within ±5% or less △: Error less than ±20%, greater than ±5%, ×: Error of ±20% or more

[0094] [Table 1]

[0095] [Table 2]

[0096] [Table 3]

Claims

1. Rubber components, It contains organic compounds other than the aforementioned rubber components, and / or inorganic compounds. Volume is 25 cm³ ３ The rubber particles are as follows:

2. The rubber particle according to claim 1, wherein the inorganic compound is a polyvalent metal salt.

3. The rubber particle according to claim 2, wherein the cation constituting the polyvalent metal salt is an alkaline earth metal ion.

4. The rubber particle according to claim 3, wherein the alkaline earth metal ion is a calcium ion.

5. The rubber particle according to any one of claims 2 to 4, wherein the anion constituting the polyvalent metal salt is a halide ion.

6. The rubber particle according to claim 5, wherein the halide ion is a chloride ion.

7. The rubber particle according to claim 6, wherein the polyvalent metal salt is calcium chloride.

8. The rubber particle according to any one of claims 1 to 4, wherein the organic compound is a compound having a hydroxyl group and / or a carboxyl group.

9. The rubber particle according to claim 8, wherein the organic compound is a polysaccharide.

10. The rubber particles according to claim 9, wherein the polysaccharide is chitosan.

11. The rubber particle according to any one of claims 1 to 4, wherein the rubber component is a diene rubber.

12. The rubber particle according to claim 11, wherein the diene rubber is at least one selected from the group consisting of natural rubber, nitrile rubber, hydrogenated nitrile rubber, butadiene rubber, isoprene rubber, cyclopentene rubber, styrenebutadiene rubber, butyl rubber, and ethylenepropylene diene rubber.

13. The rubber particles according to claim 12, wherein the diene rubber is natural rubber.

14. Rubber particles according to any one of claims 1 to 4, having a non-uniform structure.

15. Rubber particles according to any one of claims 1 to 4, wherein the aspect ratio is 1.1 to 10.

16. The rubber particles according to any one of claims 1 to 4, wherein the content of the organic compound and / or the inorganic compound relative to the rubber component is 0.05 to 2.5% by mass.

17. The rubber particles according to claim 16, wherein the content of the organic compound and / or the inorganic compound relative to the rubber component is 0.8 to 2.1% by mass.

18. Rubber particles according to any one of claims 1 to 4, wherein the protein content is 1.5% by mass or less.

19. The rubber particles according to any one of claims 1 to 4, wherein when 600 g is filled into a weight feeder and discharged for 30 minutes under the condition of 10 g / min, the error is less than ±20%.

20. A method for producing rubber particles, comprising the step of dropping rubber latex into a curing solution to obtain a cured product.

21. A method for producing rubber particles according to claim 20, comprising the step of vibrating-drying the cured product. Manufacturing method.

22. The method for producing rubber particles according to claim 20 or 21, wherein the curing liquid contains an emulsifier.

23. The method for producing rubber particles according to claim 20 or 21, wherein the amount of solids in the rubber latex is 50 to 70% by mass.

24. The method for producing rubber particles according to claim 20 or 21, wherein the content of the curing agent in the curing liquid is 0.8 to 12% by mass.

25. The method for producing rubber particles according to claim 20 or 21, wherein the dropping rate of the rubber latex is 10 to 30% by mass / min relative to the amount of the curing liquid.

26. A resin composition comprising rubber particles according to any one of claims 1 to 4.

27. A molded article containing rubber particles according to any one of claims 1 to 4.

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