Tire sealant and its use in a tire repair kit

Abstract

A tire sealant comprising: rubber latex and antifreeze; wherein the antifreeze comprises glycerol and at least one glycol ether, the glycol ether being a compound represented by formula (1): wherein R11 is a hydrogen atom or an alkyl group, R12 is an alkyl group, and p is an integer with a value from 1 to 3, wherein the number of carbons in the alkyl groups of R11 and R12 is from 1 to 6, wherein, in the case that R11 and R12 are alkyl groups, R11 and R12 may be the same or different; wherein the glycerol content is 2 to 50% by mass of the total amount of antifreeze; and wherein the glycol ether content is 50 to 98% by mass of the total amount of antifreeze.

Description

Technical field

[0001] The present invention relates to a tire sealant and a tire repair kit. State of the art

[0002] In recent years, the number of instances where a tire puncture repair kit is introduced as standard or optional equipment in a car has increased. These kits, known as puncture repair kits, combine tire sealant, a compressor, and similar components in a compact package.

[0003] If a tire is punctured, tire sealant can be injected into the tire from a tire valve using a compressor or similar device to restore the tire to a drivable condition. For example, sealants containing a natural rubber latex, a synthetic resin emulsion, and an antifreeze have been proposed (see, for example, patent document 1).

[0004] Patent document 1 describes a tire puncture sealant material comprising a natural rubber latex, an ethylene-vinyl acetate resin emulsion, a polyolefin emulsion, and an antifreeze, wherein the mass ratio between the natural rubber latex and the ethylene-vinyl acetate resin emulsion ((natural rubber) / (ethylene-vinyl acetate resin) is from 15 / 85 to 80 / 20, and the amount of solids content of the polyolefin emulsion is from 0.5 to 10 parts by mass per 100 parts by mass of the total solids content of the natural rubber latex and the ethylene-vinyl acetate resin emulsion. List of oppositions patent literature

[0005] Patent Document 1: JP 2011-162681 A Summary of the invention: Technical problem

[0006] As described above, tire sealants are provided as standard or optional equipment in automobiles and are stored in motor vehicles for long periods of time, which is why storage capacity is required.

[0007] Furthermore, in recent years there has been a need to maintain sealing performance while reducing the amount of tire sealant (for example, to about two-thirds of the known amount).

[0008] Under these circumstances, these inventors referred to patent document 1, provided a tire sealant containing a rubber latex and an antifreeze, and evaluated the tire sealant. These inventors discovered that there is a way to further improve the injectability of a tire sealant while maintaining the sealing and storage performance of the tire sealant at an excellent level.

[0009] Therefore, an objective of the present invention is to provide a tire sealant that is characterized by its injectability (e.g., simple injection into a tire valve and a short injection time), while maintaining excellent sealing and bearing performance.

[0010] Another object of the present invention is the provision of a tire repair kit. Solution to the problem

[0011] These inventors conducted investigations to solve the aforementioned problem, and as a result they discovered that the desired effect could be achieved by a tire sealant containing a rubber latex and a prescribed antifreeze, the content of which was within a specific range.

[0012] The present invention is based on the findings described above and in particular solves the problem described above by the following features.

[0013] 1. Tire sealant containing the following: rubber latex and Antifreeze; wherein the antifreeze comprises glycerol and at least one type of glycol-based compound selected from the group consisting of glycols and glycol ethers; and where the glycerin content is 2 to 50% by mass of the total amount of antifreeze.

[0014] 2. Tire sealant according to the above-mentioned 1, wherein the glycols are at least one type selected from the group consisting of ethylene glycol, propylene glycol, 1,3-propanediol and diethylene glycol.

[0015] 3. Tire sealant according to the above-mentioned 1 or 2, wherein the glycol ether compounds are expressed by formula (1).

[0016] In formula (1) R represents 11 a hydrogen atom or an alkyl group, R 12 an alkyl group and p an integer with a value of 1 or greater.

[0017] 4. Tire sealant according to any of the above 1 to 3, wherein the rubber latex is natural rubber latex.

[0018] 5. Tire sealant according to one of the above-mentioned items 1 to 4, further comprising a synthetic resin emulsion, wherein a mass ratio of a content 1 of the solid content of the rubber latex to a content 2 The solids content of the synthetic resin emulsion is 90 / 10 to 30 / 70.

[0019] 6. Tire sealant according to the above-mentioned 5, wherein the synthetic resin emulsion contains at least one type selected from the group consisting of ethylene-vinyl acetate copolymer emulsions and ethylene-vinyl acetate-vinyl versatate copolymer emulsions.

[0020] 7. Tire repair kit containing the tire sealant according to one of the above 1 to 6 and a compressor. Advantageous effects of the invention

[0021] The tire sealant according to an embodiment of the present invention is characterized by its injectability, whereby the sealing and bearing performance is maintained at an excellent level.

[0022] The tire repair kit according to an embodiment of the present invention is characterized by the injectability of the tire sealant, whereby the sealing and bearing performance is maintained at an excellent level. List of characters Fig. Figure 1 is a schematic view that schematically illustrates an example of a method of using the tire repair kit of the present invention. Description of embodiments

[0023] The present invention is described in detail below. Furthermore, in this description, the term "meth(acrylic)" refers to acrylic or methacrylic.

[0024] Furthermore, in the present description, numerical ranges specified using "(from)... to..." include the first number as a lower limit and the last number as an upper limit.

[0025] In this description, unless otherwise specified, a single corresponding substance may be used for each component, or a combination of two or more types of corresponding substances may be used for each component. If a component contains two or more types of substances, the content of the component is based on the combined content of the two or more types of substances.

[0026] In the present description, cases in which at least one of the sealing performances, the bearing performance and the injectability is better can be described as having a better effect of the present invention.

[0027] In the present invention, the rubber latex comprises rubber as a dispersoid and a dispersion medium, and the rubber is dispersed in the dispersion medium. The synthetic resin emulsion comprises a synthetic resin as a dispersoid and a dispersion medium, and the synthetic resin is dispersed in the dispersion medium. In general, in the present invention, the term emulsion includes a suspension (a system in which a solid-phase dispersoid is dispersed in a liquid-phase dispersion medium) and a system in which a liquid-phase dispersoid is dispersed in a liquid-phase dispersion medium.

[0028] The dispersion medium contained in the rubber latex or synthetic resin emulsion is not particularly restricted. Examples include water and a mixture of water and a water-soluble organic solvent.

[0029] In the present invention, the solids content of the rubber latex refers to rubber. The solids content of the rubber latex refers to the amount of rubber contained in the rubber latex or to the total content of components other than the dispersion medium of the rubber latex. In the rubber latex, the amount of rubber contained in the rubber latex and the total content of components other than the dispersion medium of the rubber latex are nearly equal.

[0030] In the present invention, the solids content of the synthetic resin emulsion means a synthetic resin. The solids content of the synthetic resin emulsion refers to the content of the synthetic resin contained in the synthetic resin emulsion or to the total content of components other than the dispersion medium of the synthetic resin emulsion. In the synthetic resin emulsion, the content of the synthetic resin contained in the synthetic resin emulsion and the total content of components other than the dispersion medium of the synthetic resin emulsion are nearly equal. Tire sealant

[0031] The tire sealant according to one embodiment of the present invention comprises: a rubber latex; and antifreeze; wherein the antifreeze includes glycerin and at least one type of glycol-based compound selected from the group consisting of glycols and glycol ethers; and where the glycerin content is 2 to 50% by mass of the total amount of antifreeze.

[0032] It is assumed that the tire sealant according to one embodiment of the present invention achieves the desired effects due to having such a configuration. Although the reason is not clear, it is assumed to be as follows.

[0033] As described above, ordinary tire sealants are injected into a tire through a tire valve using a compressor or similar device. These inventors deduced that, during the injection of the tire sealant, the propylene glycol or other antifreeze in the sealant approaches the surface of the rubber (for example, natural rubber) used as a dispersoid, causing the rubber dispersion to become unstable, the rubber to agglomerate, and consequently, the injectability of the tire sealant into the tire deteriorates.

[0034] In contrast, these inventors concluded that if the tire sealant according to one embodiment of the present invention is injected into a tire from a tire valve, the glycerin in the tire sealant attracts the propylene glycol and other glycol-based compounds away from the surface of the rubber used as a dispersoid, the dispersibility of the rubber can be kept stable, and thus the tire sealant according to one embodiment of the present invention surpasses it in terms of injectability into the tire. This is assumed to occur because glycerin has a higher affinity for water than propylene glycol and other glycol-based compounds.

[0035] Furthermore, these inventors discovered that by using a predetermined glycol-based compound in combination with glycerin as an antifreeze and maintaining the glycerin content within a specific range, the tire sealant not only excels in injectability but can also fine-tune sealing performance, storage performance, and injectability to a high level.

[0036] Each component contained in the tire sealant according to an embodiment of the present invention will then be described in detail. rubber latex

[0037] The rubber latex contained in the tire sealant according to one embodiment of the present invention is not particularly restricted, and a known rubber latex can be used.

[0038] Specific examples of rubber latex include natural rubber latex, chloroprene latex, styrene-butadiene rubber latex, acrylonitrile butadiene rubber latex, and styrene-butadiene acrylic rubber latex. Among these, natural rubber latex is preferred due to its superior sealing performance.

[0039] Natural rubber latex is not particularly restricted. Examples of natural rubber latex include natural rubber latex from which no protein has been removed and natural rubber latex from which protein has been removed.

[0040] The process for manufacturing rubber latex is not subject to any special restrictions. antifreeze

[0041] The antifreeze contained in the tire sealant according to an embodiment of the present invention comprises glycerin and at least one type of glycol-based compound selected from the group consisting of glycols and glycol ethers. Glycol-based compounds

[0042] In the present invention, the glycol-based compound is at least one type selected from the group consisting of glycols and glycol ethers.

[0043] Superior injection capability is achieved when a combination of glycols and glycerin is used as antifreeze. Glycols

[0044] Glycols are compounds that have one aliphatic hydrocarbon group and two hydroxyl groups, in which the hydroxyl group is bonded to the aliphatic hydrocarbon group and some of the carbon atoms that form the aliphatic hydrocarbon group may be substituted by oxygen atoms.

[0045] The aliphatic hydrocarbon group can be a straight-chain, a branched, or a cyclic group, or a combination thereof.

[0046] An example of a preferred aspect of the aliphatic hydrocarbon group is a saturated aliphatic hydrocarbon group.

[0047] For cases where some of the carbon atoms of the aliphatic hydrocarbon group are substituted by oxygen atoms, one example of a preferred aspect is one in which the oxygen atoms form ether bonds.

[0048] Examples of glycols include compounds represented by formula (2). HO-R 21 -OH (2)

[0049] In formula (2) R represents 21 This represents an aliphatic hydrocarbon group, and some of the carbon atoms forming the aliphatic hydrocarbon group may be substituted by oxygen atoms. Similarly to the description above, some of the carbon atoms forming the aliphatic hydrocarbon group may be substituted by oxygen atoms.

[0050] Examples of the above-mentioned R 21 are groups represented by formula (3). *-R 31 -(OR 32 ) m31 -* (3)

[0051] In formula (3) R 31 and R 32Each independently represents an aliphatic hydrocarbon group, m31 is 0 or an integer of 1 or more, and * indicates the bonding position with the hydroxy group.

[0052] The aliphatic hydrocarbon groups of R 31 and R 32 are preferably formed only by carbon atoms and hydrogen atoms. The number of carbons in the aliphatic hydrocarbon groups of R 31 and R 32 is preferably 1 or greater and is more preferably 2 or 3. Examples of the aliphatic hydrocarbon groups of R 31 and R 32 They include an ethylene group, a propylene group, and a trimethylene group. R 31 and R 32 They can be the same or different.

[0053] m31 is preferably 0 or 1.

[0054] Examples of glycols include alkylene glycol and polyalkylene glycol. The alkylene group in alkylene glycol or polyalkylene glycol can be a straight-chain, a branched chain, or a cyclic group, or a combination thereof, with a straight-chain or branched chain being a preferred aspect.

[0055] Specific examples of glycols include ethylene glycol, propylene glycol (1,2-propanediol), 1,3-propanediol and other such alkylene glycols; and diethylene glycol, dipropylene glycol and other such polyalkylene glycols.

[0056] From the perspective of achieving a superior effect of the present invention, the glycols are preferably at least one type selected from the group consisting of ethylene glycol, propylene glycol, 1,3-propanediol and diethylene glycol.

[0057] From the perspective of achieving better sealing and storage performance, the combination of glycols and glycerin is preferably a combination of propylene glycol and glycerin.

[0058] It should be noted that in the present invention the glycols do not include the glycol ethers described below. Glycol ethers

[0059] Glycol ethers are compounds in which one or both of the two hydroxyl groups of the glycols mentioned above are substituted by -OR.

[0060] R in the aforementioned -OR is conveniently a hydrocarbon group. Examples of hydrocarbon groups include aliphatic hydrocarbon groups, aromatic hydrocarbon groups, and combinations thereof. Of these, aliphatic hydrocarbon groups are preferred. The aliphatic hydrocarbon group can be straight-chain, branched, or cyclic, or a combination thereof. An example of a preferred aspect of the aliphatic hydrocarbon group is a saturated aliphatic hydrocarbon group.

[0061] Examples of glycol ethers include compounds represented by formula (4). X 41 OR 41 -OX 42 (4)

[0062] In formula (4) R represents 41This represents an aliphatic hydrocarbon group, and some of the carbon atoms forming the aliphatic hydrocarbon group may be substituted by oxygen atoms. Similarly to the description above, some of the carbon atoms forming the aliphatic hydrocarbon group may be substituted by oxygen atoms.

[0063] X 41 and X 42 Each independently represents a hydrogen atom or an R in the aforementioned -OR. It should be noted that in a case where X 41 and X 42 The presence of hydrogen atoms simultaneously is excluded. The R mentioned above is synonymous with the one described above. Preferably, one of X 41 and X 42 one is a hydrogen atom and the other is R. In a case where X 41 and X 42 R, the two R values ​​can be the same or different.

[0064] Examples of the aforementioned R 41include groups represented by the formula (5) below. *-R 51 -(OR 52 ) m51 -* (5)

[0065] In formula (5) R 51 and R 52 Each independently represents an aliphatic hydrocarbon group, m51 is 0 or an integer of 1 or greater, and * denotes the bond position.

[0066] The aliphatic hydrocarbon groups of R 51 and R 52 are preferably formed only by carbon atoms and hydrogen atoms. The number of carbons in the aliphatic hydrocarbon groups of R 51 and R 52 is preferably between 1 and 5, and is more preferably 2 or 3. Examples of the aliphatic hydrocarbon groups of R 51 and R 52 They include an ethylene group, a propylene group, and a trimethylene group. R 51 and R 52They can be the same or different.

[0067] m51 is preferably 0, 1 or 2 and is more preferably 1 or 2.

[0068] Examples of glycol ethers include compounds represented by formula (1).

[0069] In formula (1) R represents 11 a hydrogen atom or an alkyl group, R 12 an alkyl group and p an integer with a value of 1 or greater.

[0070] The alkyl groups of R 11 and R 12 are not particularly restricted. Although the alkyl group can be a straight-chain, branched-chain, or cyclic alkyl group, the alkyl group is preferably a straight-chain alkyl group.

[0071] The number of carbons in the alkyl groups of R 11 and R 12 preferably 1 to 6 and more preferably 1 to 5.

[0072] Examples of the alkyl groups of R 11 and R 12include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group and a hexyl group.

[0073] For cases where R 11 and R 12 Alkyl groups can be R 11 and R 12 be the same or different.

[0074] In formula (1) R represents 11 a hydrogen atom or an alkyl group. Of these, R 11 preferably a hydrogen atom.

[0075] In formula (1) R represents 12 This represents an alkyl group. The alkyl group is synonymous with the one described above.

[0076] In formula (1), p is an integer with a value of 1 or greater. In particular, p is preferably an integer with a value of 2 or greater, and more preferably an integer with a value of 2 or 3.

[0077] Examples of glycol ethers include alkylene glycol monoethers, alkylene glycol diethers, polyalkylene glycol monoethers and polyalkylene glycol diethers.

[0078] Specific examples of glycol ethers include ethylene glycol monomethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, 1,3-propanediol monomethyl ether and other such alkylene glycol monoalkyl ethers; ethylene glycol dimethyl ether, ethylene glycol dipropyl ether, ethylene glycol dibutyl ether, propylene glycol dimethyl ether, 1,3-propanediol dimethyl ether and other such alkylene glycol dialkyl ethers; diethylene glycol monomethyl ether, triethylene glycol monomethyl ether and other such polyalkylene glycol monoalkyl ethers; and diethylene glycol dimethyl ether, triethylene glycol dimethyl ether and other such polyalkylene glycol dialkyl ethers.

[0079] It should be noted that in the present invention, an example of a preferred aspect is one in which the glycol-based compound does not contain a surfactant. Content of glycol-based compounds

[0080] From the perspective of achieving a superior effect (especially sealing performance) of the present invention, the content of the glycol-based compound is preferably 50 to 98% by mass and more preferably 60 to 95% by mass of the total amount of antifreeze. Glycerin

[0081] The tire sealant in accordance with one embodiment of the present invention contains glycerin as an antifreeze agent.

[0082] In one embodiment of the present invention, the glycerin content is 2 to 50% by mass of the total amount of antifreeze.

[0083] If the salary 2When the concentration is 50% by mass or more, the tire sealant according to one embodiment of the present invention is characterized by a balanced ratio between sealing performance, bearing performance, and injectability. When the concentration is 50% by mass or less, the tire sealant according to one embodiment of the present invention is characterized by injectability. It is assumed that this is due to the fact that the viscosity of the tire sealant can be adjusted to a suitable range.

[0084] From the point of view of achieving a superior effect of the present invention with an excellent balance between sealing performance, storage performance and injection capability, the content is preferably 5 to 40% by mass of the total amount of antifreeze. Synthetic resin emulsion

[0085] The tire sealant according to an embodiment of the present invention preferably further comprises a synthetic resin emulsion from the perspective of achieving superior sealing and bearing performance.

[0086] The synthetic resin emulsion contained in the tire sealant according to one embodiment of the present invention is not particularly restricted.

[0087] An example of a synthetic resin emulsion is a polymer emulsion based on vinyl acetate.

[0088] The vinyl acetate-based polymer emulsion is not particularly restricted as long as the vinyl acetate-based polymer contained in the emulsion is a polymer with a repeating unit derived from vinyl acetate. Polymer emulsion based on vinyl acetate

[0089] The vinyl acetate-based polymer contained in the vinyl acetate-based polymer emulsion can be either a homopolymer or a copolymer of vinyl acetate.

[0090] In a case where the vinyl acetate-based polymer is a copolymer, the monomer other than vinyl acetate is not particularly restricted, as long as it is a compound with an ethylene-unsaturated bond. Examples include ethylene and other such olefins; Veova (an ester of tartaric acid and vinyl alcohol; also called vinylversatate); esters of (meth)acrylic acid, (meth)acrylic acid, and other such (meth)acrylic-based monomers; and styrene and other such aromatic vinyl compounds.

[0091] Examples of vinyl acetate-based polymer emulsions include vinyl acetate homopolymer emulsions and vinyl acetate-based copolymer emulsions.

[0092] Examples of vinyl acetate-based copolymer emulsions include ethylene-vinyl acetate copolymer emulsions, ethylene-vinyl acetate-vinyl versatate copolymer emulsions, ethylene-vinyl acetate-vinyl versatate (meth) acrylic-based monomer copolymer emulsions, and other such vinyl acetate-based ethylene copolymer emulsions.

[0093] From the perspective of achieving improved performance (particularly bearing and sealing performance) of the present invention, the synthetic resin emulsion is preferably a vinyl acetate-based copolymer emulsion and is more preferably at least one type consisting of ethylene vinyl acetate copolymer emulsions and ethylene vinyl acetate copolymer emulsions. Furthermore, ethylene vinyl acetate vinyl versatrate copolymer emulsions are preferred with regard to even better sealing properties.

[0094] The process for producing the synthetic resin emulsion is not subject to any specific restrictions. Any commercially available product can be used for the synthetic resin emulsion.

[0095] Salary 1 of the solids content of rubber latex: case in which the tire sealant according to the embodiment of the present invention does not contain a synthetic resin emulsion

[0096] From the perspective of achieving a better effect (especially sealing performance) of the present invention, the content is 1 The solid content of the rubber latex is preferably 30 to 60% by mass and more preferably 35 to 45% by mass of the total amount of the tire sealant.

[0097] Total amount of content 1 in solid content of rubber latex and content 2Regarding the solids content of synthetic resin emulsion: Case in which tire sealant according to an embodiment of the present invention contains synthetic resin emulsion

[0098] From the perspective of achieving a superior effect of the present invention, the total amount of content is 1 of the solids content of the rubber latex and the content 2 of the solids content of the synthetic resin emulsion preferably 30 to 60 wt% and more preferably 35 to 45 wt% of the total amount of the tire sealant.

[0099] Mass ratio of content 1 to solid content of rubber latex 2 Regarding the solids content of synthetic resin emulsion: Case in which tire sealant according to an embodiment of the present invention further contains synthetic resin emulsion

[0100] From the point of view of achieving a better effect of the present invention and being able to achieve excellent sealing performance while maintaining low viscosity at low temperatures, the mass ratio of the content is 1 of the solid content of the rubber latex to the content 2 of the solid of the synthetic resin emulsion ((content 1 of the solid content of the rubber latex) / (content 2 of the solids content of the synthetic resin emulsion)) preferably 90 / 10 to 30 / 70 and more, preferably 80 / 20 to 40 / 60. Amount of water contained in tire sealant

[0101] From the perspective of achieving a superior effect (especially sealing performance) of the present invention, the water content (total amount of water) in the tire sealant according to one embodiment of the present invention is preferably 20 to 50% by mass and more preferably 23 to 38% by mass of the total amount of the tire sealant. Other components

[0102] In addition to the above-mentioned components, the tire sealant according to one embodiment of the present invention may, if desired, contain surfactants, gelling agents, fillers, anti-aging agents, antioxidants, pigments, plasticizers, thixotropic agents, UV absorbers, flame retardants, dispersants, dehydrating agents and antistatic agents in addition to the above-mentioned glycol-based and glycerin compounds (hereinafter also referred to as additives, such as antifreeze in addition to glycol-based compounds, etc.). surfactant

[0103] The surfactant, which may also be included in the tire sealant according to one embodiment of the present invention, is not particularly restricted. For example, the surfactant may be a non-ionic, anionic, cationic, or amphoteric surfactant.

[0104] Examples of nonionic surfactants include polyoxyethylene alkylamine, polyoxyethylene alkylamide, polyoxyethylene fatty acid esters, polyoxyethylene castor oil, polyoxyethylene resin esters, polyoxyethylene lanolin ethers, polyoxyethylene polyoalcohol ethers, polyoxyethylene polyalcohol fatty acid esters, polyol fatty acid esters, fatty acid alkanolamide, and similar nonionic surfactants. The HLB value of the nonionic surfactant is preferably between 12.0 and 19.0.

[0105] The term HLB refers to a value calculated using the Oda equation based on an organic conceptual diagram. This calculation method is described, for example, in "Techniques of Emulsification and Solubilization" (1976, published by Kougakutosho Ltd.). Additionally, the organic and inorganic values ​​for deriving the HLB can be calculated using the table of inorganic groups (values ​​reported by Fujita et al. in 1974), described in "Organic Conception Diagram - Basis and Applications -" (1984, published by Sankyo Shuppan Co., Ltd.).

[0106] Examples of anionic surfactants include alkyl sulfates (e.g., sodium lauryl sulfate), alkyl ether sulfates, polyoxyethylene alkyl ether sulfates, polyoxyethylene alkyl phenyl ether sulfates, alkylbenzene sulfonates, alkylnaphthalene sulfonates, salts of higher fatty acids (soaps), α-sulfofaticial methyl ester salts, α-olefin sulfonates, alkane sulfonates, (mono)alkyl phosphates, polyoxy-mono- and -distyrylphenyl ether monoester sulfosuccinates, and alkylphenoxypolyoxyethylene propylsulfonates.

[0107] Examples of cationic surfactants include tetraalkylammonium chloride, trialkylbenzylammonium chloride, alkylamines, monooxyethylenealkylamines and polyoxyethylenealkylamines.

[0108] The surfactant preferably includes a non-ionic surfactant and an anionic surfactant.

[0109] From the perspective of achieving a superior effect of the present invention (in particular bearing performance and the so-called valve injection capability at high temperatures) and the excellent stabilization of the rubber latex, the mass ratio of the non-ionic surfactant to the anionic surfactant (non-ionic surfactant / anionic surfactant) for cases in which a non-ionic surfactant and an anionic surfactant are used in combination is preferably 1.0 / 1.0 to 1.0 / 10.0).

[0110] From the perspective of achieving a superior effect of the present invention (in particular the storage performance), the amount of surfactant (the total amount for cases where surfactants are used in combination) is preferably 3 to 20 parts by mass per 100 parts by mass of the solids content of the rubber latex. Antifreeze, in addition to glycol-based compounds and the like

[0111] Examples of antifreeze, besides glycol-based compounds and the like, include alcohols with a hydroxy group such as methanol and ethanol; and trihydric and higher alcohols, besides glycerol.

[0112] In the present invention, the content of the antifreeze, in addition to glycol-based compounds and the like, is preferably 0% by mass of the total amount of antifreeze.

[0113] In the present invention, an example of a preferred aspect is one in which the antifreeze is only the glycol-based compound and glycerin. Manufacturing process

[0114] The method for producing the tire sealant according to one embodiment of the present invention is not subject to any specific limitations. For example, a method can be used in which a rubber latex, a predetermined antifreeze agent, and, if required, a synthetic resin emulsion or additives are thoroughly mixed using a combination mixer or other mixers.

[0115] Water can also be added to the system if necessary. viscosity

[0116] From the perspective that the injectability at low temperatures is excellent, the viscosity at -30 °C of the tire sealant according to one embodiment of the present invention is preferably 1500 mPa or less.

[0117] The temperature when using the tire sealant according to an embodiment of the present invention is not particularly limited and can, for example, be in a range from -45 °C to +70 °C. Tire repair kit

[0118] The tire repair kit according to one embodiment of the present invention is a tire repair kit comprising the tire sealant according to one embodiment of the present invention and a compressor.

[0119] The tire sealant used in the tire repair kit according to one embodiment of the present invention is not particularly restricted, as long as it is a tire sealant according to an embodiment of the present invention. The tire sealant is advantageously stored in a container. A preferred aspect is one in which the container is pressure-resistant. The compressor used in the tire repair kit according to one embodiment of the present invention is not particularly restricted. For example, the compressor can be an air compressor. A preferred aspect is one in which the compressor has a pressure gauge (for example, an air pressure gauge).

[0120] An example of a preferred aspect is one where the tire repair kit also includes two hoses. Procedure for using the tire repair kit

[0121] The method for using the tire repair kit according to one embodiment of the present invention is described below with reference to the accompanying drawing. The tire repair kit according to one embodiment of the present invention and the method of its use are not limited to the accompanying drawing.

[0122] Fig. Figure 1 is a schematic view that schematically illustrates an example of a method of using the tire repair kit of the present invention.

[0123] In Fig. 1 includes a tire repair kit 20 a container 4 and a compressor 1 one, and a tire sealant 6 is in the container 4 contain.

[0124] The container 4 closes an opening section 5 , through the compressor 1 supplied air into the container 4 a nozzle enters3 , which is connected to the opening section 5 is connected, and has an outlet section 7 one. The container 4 It is pressure-resistant.

[0125] The compressor 1 closes an electrical cable 13 and a plug 14 one. The plug 14 is connected to an accessory socket inside the vehicle. The compressor 1 It also includes a pressure gauge.

[0126] The tire repair kit 20 closes hoses 2 and 8 a.

[0127] When a tire is punctured, one end of the inner tube is punctured first. 2 with the compressor 1 connected, the other end of the hose 2 with the opening section 5 connected and the container 4 and the compressor 1 tied together.

[0128] Furthermore, the outlet section 7and one end of the hose 8 connected to each other, the other end of the hose 8 is equipped with a valve 10 a tire 9 , and the container 4 and the tire 9 are thus connected to each other.

[0129] Next, a switch on the compressor will be used. 1 switched on to start the compressor 1 to drive it, and air is supplied by the compressor 1 sent. Air that came from the compressor 1 The signal, which is sent, flows through the hose. 2 , the opening section 5 and the nozzle 3 and is placed in the container 4 fed in. The internal pressure of the container. 4 The pressure is gradually increased by the air supplied to it, and when the internal pressure of the container 4 as it increases to reach a certain level, it is extruded into the container 4 introduced air, the tire sealant 6 .

[0130] In the present invention, the matter of the tire sealant beginning to be extruded from the container is referred to as the “start-up of the tire sealant injection”.

[0131] The extruded tire sealant passes through the dispensing section. 7 , through the hose 8 and through the valve 10 through and is in the tire 9 injected.

[0132] In the present invention, the process of ensuring that the tire sealant is completely injected into the tire is referred to as the "completion of the tire sealant injection". When the tire sealant is completely injected into the tire, the pressure indicated by the pressure gauge temporarily decreases.

[0133] This configuration allows the entire amount of tire sealant in the container to flow into the tire's interior.

[0134] Then the compressor will also be used.1 continuously driven, air from the compressor 1 will be the tire 9 supplied, and the tire 9 It will be inflated.

[0135] After the air in the tire 9 Once the tire is sufficiently inflated and the pressure reading (internal tire pressure) reaches a predetermined value (e.g., 250 kPa) or higher, the compressor switch will turn off. 1 switched to OFF and the compressor 1 stopped. In one embodiment of the present invention, after the injection of the tire sealant has been completed, the internal pressure of the tire has exceeded a predetermined value and the compressor has been stopped, the pressure indicated by the pressure gauge is referred to as the “pressure after stopping the compressor”.

[0136] After the compressor is stopped, the hose 8 from the valve 10 removed (if possible, a cap is placed on the valve)10 (set), and the vehicle is driven immediately. Driving at, for example, 80 km / h or slower is preferred. Driving allows the tire sealant inside the tire to circulate. 9 seal the tire puncture.

[0137] In a case where the tire's internal pressure is insufficient after driving, the compressor is reconnected to the tire and operated, and the tire is filled with air until the tire's internal pressure reaches a necessary level.

[0138] It should be noted that in Fig. 1 of the opening section 5 and the outlet section 7 on the underside of the container 4While the opening and outlet sections are arranged in different ways, in one embodiment of the present invention, the container can be positioned such that the opening section and the outlet section are located at the top of the container. In this case, the nozzle is preferably connected to the outlet section inside the container. To enable the tire sealant to be injected into the tire without waste, the length of the nozzle connected to the outlet section is preferably somewhat shorter than the height of the container, and the tip of the nozzle is positioned near the bottom surface of the container.

[0139] The tire sealant according to one embodiment of the present invention, or the tire repair kit according to one embodiment of the present invention, can be used to repair punctures in various types of pneumatic tires. Examples of such tires include car tires, tires of two-wheeled vehicles, tires of single-wheeled vehicles, wheelchair tires, and tires for motor vehicles used in agriculture and horticulture. Examples

[0140] The present invention is described in detail below with reference to examples, however the present invention is not limited to such examples. Production of tire sealant

[0141] The components shown in Table 1 below were used in the compositions (mass fraction) shown in the same table and mixed using a stirrer to produce tire sealant.

[0142] Note that in Table 1, the upper numbers in the NR latex series indicate the amount of NR latex, and the lower numbers in parentheses in the NR latex series indicate the solids content of the NR latex. The same applies to the synthetic resin emulsion. 1 . Evaluation

[0143] The following evaluations were carried out using the tire sealants produced as described above. The results are shown in Table 1. Sealing performance evaluation: Puncture repair distance. Sealing performance evaluation procedure.

[0144] A puncture hole (diameter: 4 mm) was made in the shoulder groove section of the tread of a 215 / 60 R16 tire.

[0145] Next, the punctured tire was mounted on a drum testing device, 350 ml of the tire sealant produced as described above was injected through the tire valve, and the tire was then filled with air until the internal pressure of the tire reached 200 kPa.

[0146] The tire was then subjected to repeated intermittent driving, in which it was driven at a speed of 30 km / h under a load of 350 kg and then stopped until the puncture was sealed and no air leakage occurred. The distance (puncture repair distance) at which the puncture was sealed was measured. The presence or absence of air leakage was confirmed by spraying the puncture area with soapy water and checking for bubbles forming in the soapy water. Evaluation criteria for sealing performance

[0147] Cases where the aforementioned puncture repair distance was 5 km or less were rated as having extremely excellent sealing performance and were given an “A” rating.

[0148] Cases where the aforementioned puncture repair distance exceeded 5 km but was less than 10 km were rated as having excellent sealing performance and were marked with a "B".

[0149] Cases where the aforementioned puncture repair distance exceeded 10 km were rated as having poor sealing performance and were marked with a "C". Warehouse performance evaluation procedure for warehouse performance

[0150] A quantity of 350 ml of the tire sealant produced as described above was introduced into a container.

[0151] A high-temperature vibration test was performed in which a vibration load with an amplitude of ±1.5 mm was applied to the container for 168 hours under a condition of 80±2 °C.

[0152] The condition of the tire sealant inside the container was visually observed before and after the test. In cases where aggregates in the tire sealant were not visually confirmed after the aforementioned test, the tire sealant was filtered after the test using a 100-mesh (nylon) filter, the weight of the filtered material was measured, and the quantity (mass %) of the filtered material in relation to the total quantity of tire sealant was calculated. Evaluation criteria for warehouse performance

[0153] Cases in which aggregates were not visually observed in the tire sealant before and after the high-temperature vibration tests, and the amount of filtered material was 0.2% by mass or less of the total amount of tire sealant, were rated as having extremely excellent storage properties and were marked with “A”.

[0154] Cases in which aggregates were not visually observed in the tire sealant before and after the high-temperature vibration tests, and the amount of filtered material exceeded 0.2% by mass of the total amount of tire sealant, were rated as having excellent storage properties and were marked with a "B".

[0155] Cases where aggregates in the tire sealant were not visually observed before the high-temperature vibration tests, but aggregates in the tire sealant were visually observed after the high-temperature vibration tests, were rated as having poor storage properties and marked with a "C". Injectability 1: Ease of injection. Injectability 1 assessment procedure.

[0156] A quantity of 350 ml of the tire sealant produced as described above was placed in a container, and the container was heated to 70 °C.

[0157] Next, an air compressor was used as the compressor, and a 215 / 60 R16 tire was used as the tire, in which a puncture hole (diameter: 4 millimeters) was made in the shoulder groove section. As in Fig. As shown in Figure 1, the container was oriented downwards and connected to the air compressor and the tire via hoses.

[0158] Next, the air compressor switch was turned ON, compressed air was introduced from the air compressor into the container to increase the internal pressure of the container, and this pressure was used to extrude the tire sealant, heated as described above, from inside the container, and the entire quantity of tire sealant was injected through the tire valve and into the tire.

[0159] Then compressed air was also supplied from the compressor to inflate the tire, and when the internal pressure of the tire reached 250 kPa, the air compressor switch was turned OFF and the air compressor was stopped.

[0160] After the compressor was stopped, the pressure indicated by the pressure gauge (pressure after stopping the compressor) was measured. Evaluation criteria for injectability 1

[0161] Cases where the pressure after switching off the compressor was 230 kPa or more were rated as extremely easy to repair using tire sealant and injecting air, and were given an "A" rating.

[0162] Cases where the pressure after switching off the compressor was not less than 210 kPa and less than 230 kPa were assessed as easily repairable with tire sealant and air injection and were marked with a "B".

[0163] Cases where the pressure after switching off the compressor was not less than 150 kPa and less than 210 kPa were assessed as cases where tire sealant could be injected, but after injecting it it was somewhat difficult to fill the inside of the tire with air, and they were marked with "C".

[0164] Cases where the pressure after switching off the compressor was less than 150 kPa were assessed as cases where tire sealant could be injected, but after injecting it it was very difficult to fill the inside of the tire with air, and they were marked with "D". Injectability 2: Injection timing assessment procedure for injectability 2

[0165] When assessing injectability 1The time (injection time) was measured from the start of the tire sealant injection (start of the extrusion of the tire sealant from the container) until the end of the tire sealant injection (tire sealant is completely injected into the tire). Evaluation criteria for injectability 2

[0166] A shorter injection time indicates better injectability. In the present invention, cases where the injection time was within 40 seconds were considered to have outstanding injectability. Tire sealant viscosity at -30 °C: Viscosity evaluation method

[0167] The viscosity of the tire sealant produced as described above at -30 °C was measured using a Brookfield viscometer (trade name TV-25, available from Toki Sangyo Co., Ltd., rotor no. 3) at a rotational speed of 60 rpm. Viscosity evaluation criteria

[0168] Injection properties at low temperatures improve with decreasing viscosity. In the present invention, cases where the viscosity of the tire sealant at -30 °C was 1500 mPa·s or less were considered to have excellent injection properties at low temperatures. [Table 1-I] Table 1 Comparative example 1 2 3 4 5 6 7 NR latex 1 133 133 133 133 133 133 133 (80) (80) (80) (80) (80) (80) (80) Synthetic resin emulsion 1 40 40 40 40 40 40 40 (20) (20) (20) (20) (20) (20) (20) antifreeze Glycerin 100 Glycol-based compound Glycols 1 (EC) 100 30 Glycols 2 (PG) 100 70 70 Glycol ether 1 (MTG) 100 Glycol ether 2 (MDG) 100 30 Sealing performance C B A A A A A Storage capacity A C B B B C B Injectability 1 (ease of injection) A B C D D B C Injection capability 2 (injection time: seconds) 58 15 17 27 24 16 20 Viscosity of the tire sealant at -30 °C (units: mPa.s) 2000 450 1100 650 500 900 870 [Table 1-II] Table 1 Example Comparative example Example 1 8 2 3 4 NR latex 1 133 133 133 133 133 (80) (80) (80) (80) (80) 40 40 40 40 40 Synthetic resin emulsion 1 (20) (20) (20) (20) (20) antifreeze Glycerin 30 1 2 5 30 Glycol-based compound Glycols 1 (EC) 70 Glycols 2 (PG) 99 98 95 70 Glycol ether 1 (MTG) Glycol ether 2 (MDG) Sealing performance B A A A A Storage capacity B B B A A Injectability 1 (ease of injection) A C B A A Injection capability 2 (injection time: seconds) 20 17 18 22 23 Viscosity of the tire sealant at -30 °C (units: mPa.s) 1050 1100 1100 1120 1300 [Table 1-III] Table 1 Example Comparative example Example Example 5 6 9 7 8 9 NR latex 1 133 133 133 133 133 167 (80) (80) (80) (80) (80) (100) Synthetic resin emulsion 1 40 40 40 40 40 (20) (20) (20) (20) (20) antifreeze Glycerin 40 50 70 30 30 30 Glycol-based compound Glycols 1 (EC) Glycols 2 (PG) 60 50 30 70 Glycol ether 1 (MTG) 70 Glycol ether 2 (MDG) 70 Sealing performance A B B A A B Storage capacity A A A B B B Injectability 1 (ease of injection) A A A B B B Injection capability 2 (injection time: seconds) 25 28 55 28 27 15 Viscosity of the tire sealant at -30 °C (units: mPa.s) 1400 1500 1800 900 800 1000

[0169] Details of the components described in Table 1 are as follows.

[0170] • NR rubber latex 1 Natural rubber latex (Hytex HA, solids content: 60 wt%, available from Fulflex (distributed by Nomura Trading Co., Ltd.))

[0171] • Synthetic resin emulsion 1 : Ethylene-vinyl acetate-vinyl versatate copolymer emulsion (Sumikaflex 950HQ, solids content: 50 wt%, available from Sumika Chemtex Co., Ltd.)

[0172] • Glycerin: available from Kao Corporation • Glycols 1 (EC): Ethylene glycol (available from Sankyo Chemical Industry Co., Ltd.) • Glycols 2 (PG): Propylene glycol (available from Adeka Corporation, propylene glycol for industrial use) • Glycol ethers 1 (MTG): Triethylene glycol monomethyl ether (available from Nippon Nyukazai Co., Ltd.) • Glycol ethers 2 (MDG): Diethylene glycol monomethyl ether (available from Nippon Nyukazai Co., Ltd.)

[0173] As can be seen from the results in Table 1, the comparative example showed 1 , which did not contain a specified glycol-based compound, exhibited poor sealing performance. Comparative example 1 It also showed a long injection time and poor injectability.

[0174] The comparative examples 2 until 7, which did not contain glycerin, showed poor storage performance and injectability.

[0175] The comparative examples 8 and 9 , which had a glycerin content outside the prescribed range, showed poor injectability.

[0176] The tire sealant according to one embodiment of the present invention was characterized by its injectability, whereby the sealing and bearing performance is maintained at an excellent level.

[0177] When comparing Examples 1 to 8 and Example 9, Examples 1 to 8, which contained the rubber latex and the synthetic resin emulsion, showed better sealing performance, shelf life and injectability compared to Example 9, which contained the rubber latex.

[0178] When examples 1 and 4 and examples 7 and 8 are compared, the cases (examples) showed 1 and 4), in which glycols were included as a glycol-based compound, shorter injection times and better injectability than the cases (Examples 7 and 8) that contained glycol ethers.

[0179] When comparing examples 3 to 5 and examples 2 and 6, cases (examples 3 to 5) in which the glycerol content was 5 to 40% by mass of the total amount of antifreeze were able to achieve a higher level of equilibrium in terms of sealing performance, storage capacity and injectability than the case (example 2) in which the glycerol content was less than 5% by mass, and the case (example 6) in which the glycerol content exceeded 40% by mass. Reference symbol list 1: Compressor 2, 8: Hose 3: Nozzle 4: Container 5: Opening section 6: Tire sealant 7: Outlet section 9: Tires 10: Valve 13: electrical cable 14: Plug 20: Tire repair kit QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2011162681 A

[0005]

Claims

[1] Tire sealant comprising the following: rubber latex and Antifreeze; wherein the antifreeze comprises glycerin and at least one type of glycol-based compound selected from the group consisting of glycols and glycol ethers; and where the glycerin content is 2 to 50% by mass of the total amount of antifreeze. [2] Tire sealant according to claim 1, wherein the glycols are at least one type selected from the group consisting of ethylene glycol, propylene glycol, 1,3-propanediol and diethylene glycol. [3] Tire sealant according to claim 1 or 2, wherein the glycol ethers are compounds represented by formula (1). wherein R 11 a hydrogen atom or an alkyl group, R 12 an alkyl group and p represents an integer with a value of 1 or greater. [4] Tire sealant according to any one of claims 1 to 3, wherein the rubber latex is natural rubber latex. [5] Tire sealant according to any one of claims 1 to 4, further comprising a synthetic resin emulsion, wherein the mass ratio of a content 1 of the solid content of the rubber latex to a content 2 of the solid content of the synthetic resin emulsion is 90 / 10 to 30 / 70. [6] Tire sealant according to claim 5, wherein the synthetic resin emulsion contains at least one type selected from the group consisting of ethylene-vinyl acetate copolymer emulsions and ethylene-vinyl acetate-vinyl versatrate copolymer emulsions. [7] Tire repair kit comprising the tire sealant according to any one of claims 1 to 6 and a compressor.