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US20160185052A1 - Coagulant and tire puncture repair kit - Google Patents

Coagulant and tire puncture repair kit Download PDF

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Publication number
US20160185052A1
US20160185052A1 US14/908,449 US201414908449A US2016185052A1 US 20160185052 A1 US20160185052 A1 US 20160185052A1 US 201414908449 A US201414908449 A US 201414908449A US 2016185052 A1 US2016185052 A1 US 2016185052A1
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US
United States
Prior art keywords
puncture repair
tire puncture
repair liquid
coagulant
mass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/908,449
Inventor
Takahiro Okamatsu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
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Filing date
Publication date
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Assigned to THE YOKOHAMA RUBBER CO., LTD. reassignment THE YOKOHAMA RUBBER CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OKAMATSU, TAKAHIRO
Publication of US20160185052A1 publication Critical patent/US20160185052A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
    • B29C73/16—Auto-repairing or self-sealing arrangements or agents
    • B29C73/163—Sealing compositions or agents, e.g. combined with propellant agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen
    • C08L23/0853—Ethene vinyl acetate copolymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
    • C08L3/02—Starch; Degradation products thereof, e.g. dextrin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
    • C08L3/12—Amylose; Amylopectin; Degradation products thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/08—Copolymers of ethylene
    • B29K2023/083—EVA, i.e. ethylene vinyl acetate copolymer
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/52—Aqueous emulsion or latex, e.g. containing polymers of a glass transition temperature (Tg) below 20°C
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Definitions

  • the present invention relates to a coagulant and a tire puncture repair kit.
  • a coagulant has been used to recover puncture repair liquid after a tire puncture has been repaired using a tire puncture repair liquid (a tire puncture sealing material).
  • Patent Document 1 the present inventors of the present invention suggests “an emulsion coagulant for coagulating a tire puncture sealing material containing emulsion particles, in which the emulsion coagulant contains a mineral that induces aggregation of the emulsion particles as a result of weakening a surface charge of the emulsion particles and/or as a result of hydrogen bonding with the emulsion particles, and a gelling agent” (claim 1 ).
  • Patent Document 2 the present inventors suggests “a liquid coagulant that coagulates an emulsion containing natural rubber latex, in which the liquid coagulant has a pH of 2.0 to 4.0, and contains a urethane resin and/or an acrylic resin having a cationic functional group” (claim 1 ).
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2009-041006A
  • Patent Literature 2 Japanese Unexamined Patent Application Publication No. 2011-246610A
  • the technical goal of the present invention is to provide a coagulant for a tire puncture repair liquid with excellent coagulability in the same manner as Patent Documents 1 and 2, and a tire puncture repair kit that uses the tire puncture repair liquid.
  • the present inventors achieved the present invention by discovering that a coagulant that contains ⁇ -starch and/or a dextrin having a specific weight average molecular weight exhibits excellent coagulability of a puncture repair liquid.
  • a coagulant that coagulates a tire puncture repair liquid comprising at least one selected from the group consisting of an ⁇ -starch and a dextrin having a weight average molecular weight of 3,000 to 50000.
  • the tire puncture repair liquid comprises at least one selected from the group consisting of a natural rubber latex and a synthetic resin emulsion.
  • a tire puncture repair kit comprising the coagulant according to any one of (1) to (7) and a tire puncture repair liquid.
  • FIGS. 1A to 1C are schematic cross-sectional views illustrating an example of a method for recovering tire puncture repair liquid, which uses the coagulant of the present invention.
  • the coagulant of the present invention coagulates a tire puncture repair liquid, and contains an ⁇ -starch and/or a dextrin having a weight average molecular weight of 3,000 to 50,000.
  • the coagulant of the present invention comprise at least one deliquescent inorganic salt selected from the group consisting of sodium chloride, potassium chloride and magnesium chloride.
  • the coagulability with respect to a tire puncture repair liquid is made favorable by using the ⁇ -starch and/or the dextrin.
  • the coagulability is made favorable as a result of the tire puncture repair liquid being taken in between saccharide chains in which the hydrogen bond have been broken.
  • the coagulability is made favorable as a result of the absorbability of the tire puncture repair liquid being raised due to the molecular weight of starch being decreased by oxygen or the like.
  • ⁇ -starch refers to a starch in a state in which the hydrogen bonds between saccharide chains in the starch have been broken down and the saccharide chains are free, and more specifically, refers to processed starch in which starch that has been gelatinized by adding water to and heating non-gelatinized starch (hereinafter, also referred to as “raw material starch”), and dried rapidly.
  • raw material starch examples include non-gelatinized starch separated from potatoes, wheat, rice, corn, sweet potato, cassava, arrowroot, dogtooth violet, broad bean, mung beans, red beans, and the like.
  • ⁇ -starch may be a starch on which processing treatment such as esterification, etherification, or cross-linking have been further carried out on ⁇ -starch.
  • the amylopectin content of the ⁇ -starch is preferably 75 mass % or more, and is more preferably 75 to 90 mass %.
  • the “amylopectin content” can be measured using a method in which sedimentation and separation of amylopectin is performed by reacting a concanavalin A, which specifically bonds with amylopectin, with a sample.
  • dextrin refers to a substance in which the molecular weight of a starch has been decreased, and in the present invention, a dextrin with a weight average molecular weight of 3,000 to 50,000 is used.
  • the weight average molecular weight of the dextrin is an average molecular weight (expressed in terms of polyethylene glycol) that is measured by the gel permeation chromatography (GPC).
  • the above-mentioned dextrin may be a substance that is dry degraded (a torrefaction dextrin), and may be a substance that is wet degraded (an acid-treated starch, an oxidized starch, or an enzyme modified starch).
  • the weight average molecular weight of the dextrin is preferably 20,000 to 50,000, and is more preferably 20,000 to 40,000.
  • the coagulant of the present invention is not particularly limited as long as it contains the ⁇ -starch and/or the dextrin, but from a viewpoint of further improving the coagulability, it is preferable that the ⁇ -starch and the dextrin be used in combination.
  • the coagulant of the present invention preferably contains 50 to 100 mass % of the ⁇ -starch and/or the dextrin with respect to the total mass of the coagulant, and more preferably contains 60 to 95 mass %.
  • the above-mentioned mass % refers to the total mass %.
  • the coagulant of the present invention include at least one deliquescent inorganic salt selected from the group consisting of sodium chloride, potassium chloride and magnesium chloride.
  • the term “deliquescent” refers to a property of forming an aqueous solution by absorbing water (moisture) in air.
  • the content of the deliquescent inorganic salt is preferably 5 to 100 parts by mass per 100 parts by mass of the total of the ⁇ -starch and the dextrin (or the corresponding component in a case in which only either one is included), more preferably 5 to 50 parts by mass, and still more preferably 10 to 30 parts by mass.
  • the coagulant of the present invention can include additives such as a filler, an anti-aging agent, an antioxidant, a pigment (dye), a plasticizer, a thixotropic agent, a UV absorbent, a flame retardant, a surfactant, a dispersant, a dehydrating agent, or an antistatic agent as desired according to necessity.
  • additives such as a filler, an anti-aging agent, an antioxidant, a pigment (dye), a plasticizer, a thixotropic agent, a UV absorbent, a flame retardant, a surfactant, a dispersant, a dehydrating agent, or an antistatic agent as desired according to necessity.
  • the production (preparation) method of the coagulant of the present invention is not particularly limited, and for example, it is possible to produce the coagulant by uniformly blending the ⁇ -starch and/or the dextrin, and the deliquescent inorganic salt and additives, which are optional components.
  • a tire puncture repair liquid that is coagulated by the coagulant of the present invention is not particularly limited.
  • tire puncture repair liquid examples include a repair liquid that contains a natural rubber latex and/or a synthetic resin emulsion, a repair liquid that contains an anti-freezing agent in addition to these, or the like.
  • the phase of the synthetic resin which is a dispersoid, may be a liquid phase or may be a solid phase.
  • emulsion a system in which a liquid phase dispersoid is dispersed in a liquid phase dispersion medium
  • a system in which a solid phase dispersoid is dispersed in a liquid phase dispersion medium is referred to as a “suspension”
  • the term “emulsion” includes the definition of a “suspension”.
  • the natural rubber latex is not particularly limited, and a conventionally-known natural rubber latex can be used.
  • examples of the natural rubber latex include a natural rubber latex that is extracted by tapping of Hevea brasiliensis , a so-called “deproteinized natural rubber latex” in which proteins have been removed from a natural rubber latex, and the like.
  • the synthetic resin emulsion is not particularly limited, and it is possible to use a conventionally-known synthetic resin emulsion.
  • examples of the synthetic resin emulsion include a urethane emulsion, an acrylic emulsion, a polyolefin emulsion, an ethylene vinyl acetate copolymer emulsion, a polyvinyl acetate emulsion, an ethylene-vinyl acetate-vinyl versatate copolymer emulsion, a polyvinyl chloride emulsion, and the like, and a single type thereof may be used independently, or two or more types may be used in combination.
  • the antifreezing agent is not particularly limited, and it is possible to use a conventionally-known antifreezing agent.
  • examples of the antifreezing agent include ethylene glycol, propylene glycol, diethylene glycol, glycerin, methanol, ethanol, isopropyl alcohol and the like, and a single type thereof may be used independently, or two or more types may be used in combination.
  • the tire puncture repair liquid that is coagulated by the coagulant of the present invention can include various additives such as a filler, an anti-aging agent, an antioxidant, a pigment (dye), a plasticizer, a thixotropic agent, a UV absorbent, a flame retardant, a surfactant (including a leveling agent), a dispersant, a dehydrating agent, or an antistatic agent as desired according to necessity.
  • a used amount of the coagulant with respect to such a tire puncture repair liquid is preferably 5 to 150 parts by mass per 100 parts by mass of the tire puncture repair liquid, more preferably 5 to 100 parts by mass, and still more preferably 10 to 50 parts by mass.
  • Examples of the form (for example, the usage form or marketing form) of the coagulant of the present invention include individual use of the coagulant, and a set including the coagulant and a tire puncture repair liquid (a tire puncture repair kit).
  • a method for recovering puncture repair liquid that uses the coagulant of the present invention (hereinafter, also referred to as a “use method of the coagulant of the present invention”) will be described below using FIGS. 1A to 1C . Additionally, the use method of the coagulant of the present invention is not particularly limited to the aspect that is illustrated in FIGS. 1A to 1C .
  • FIGS. 1A to 1C are schematic cross-sectional views illustrating an example of a method for recovering tire puncture repair liquid, which uses the coagulant of the present invention.
  • a valve core (not illustrated in the drawing) is detached from a tire valve 3 of a wheel 2 in which a tire puncture repair liquid 4 is injected inside a pneumatic tire 1 .
  • a tube 5 is inserted inside the pneumatic tire 1 via the tire valve 3 .
  • the tire puncture repair kit of the present invention includes the coagulant of the present invention and a tire puncture repair liquid.
  • the tire puncture repair liquid in the tire puncture repair kit of the present invention is the same as the above-mentioned tire puncture repair liquid that is described as the target for coagulation by the coagulant of the present invention.
  • the used amount (a solid content) of the coagulant of the present invention when sealing a puncture hole using the tire puncture repair kit of the present invention is the same as the above-mentioned used amount of the coagulant of the present invention with respect to the tire puncture repair liquid, and is preferably 5 to 150 parts by mass per 100 parts by mass of the tire puncture repair liquid, more preferably 10 to 100 parts by mass, and still more preferably 10 to 50 parts by mass.
  • Tire puncture repair liquids A and B were prepared by mixing the components of the tire puncture repair liquids A and B, which are shown in Table 1 below, at the quantities (unit: parts by mass) shown in the table using an agitator.
  • Emulsion 1 natural rubber emulsion (HA Latex, solid content: 60 mass %, produced by Golden Hope Co., Ltd.)
  • Emulsion 2 ethylene vinyl acetate emulsion (solid content: 51 mass %, Sumika Flex S-408HQE, produced by Sumika Chemtex Co., Ltd.)
  • Antifreezing agent polypropylene glycol (solid content: 100 mass %, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Surfactant A sodium dodecyl sulfate (produced by Wako Pure Chemical Industries Co., Ltd.)
  • Surfactant B Polyoxyethylene alkyl ether (Emulgen 109, manufactured by Kao Corporation)
  • Coagulants were prepared by mixing the starch A, the ⁇ -starches B to I and/or the dextrins J to R components, which are shown in Table 2 below, at the quantities (unit: parts by mass) shown in the table using an agitator.
  • Coagulants prepared using Working Examples 1 to 34, 35 and 36, and Comparative Examples 1 to 5 were added with the parts by mass shown in Table 2 per 100 parts by mass of either the tire puncture repair liquids A or B prepared in the manner mentioned above, and stirred.
  • Starch A Reagent (amylopectin content: 60 mass %, produced by Wako Pure Chemical Industries Co., Ltd.)
  • ⁇ -starch B Reagent (amylopectin content: 50 mass %, produced by Wako Pure Chemical Industries Co., Ltd.)
  • ⁇ -starch C Reagent (amylopectin content: 60 mass %, produced by Wako Pure Chemical Industries Co., Ltd.)
  • ⁇ -starch D ⁇ -wheat starch (amylopectin content: 70 mass %, produced by Nippon Flour Mills Co., Ltd.)
  • ⁇ -starch E ⁇ -white bean (amylopectin content: 72 mass %, produced by Nippon Flour Mills Co., Ltd.)
  • ⁇ -starch F ⁇ -corn (amylopectin content: 75 mass %, produced by Sanwa Starch Co. Ltd.)
  • ⁇ -starch G ⁇ -red bean (amylopectin content: 78 mass %, produced by Sanwa Starch Co. Ltd.)
  • ⁇ -starch H ⁇ -tapioca (amylopectin content: 83 mass %, produced by Sanwa Starch Co. Ltd.)
  • ⁇ -starch I ⁇ -glutinous rice (amylopectin content: 100 mass %, produced by Nippon Flour Mills Co., Ltd.)
  • Dextrin J Reagent (weight average molecular weight: 2,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin K Reagent (weight average molecular weight: 2,500, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin L Reagent (weight average molecular weight: 3,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin M Reagent (weight average molecular weight: 5,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin N Reagent (weight average molecular weight: 10,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin O Reagent (weight average molecular weight: 30,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin P Reagent (weight average molecular weight: 40,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin Q Reagent (weight average molecular weight: 50,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin R Reagent (weight average molecular weight: 70,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Deliquescent Inorganic Salt Sodium chloride (produced by Wako Pure Chemical Industries Co., Ltd.)
  • Comparative Example 1 which used starch
  • Comparative Example 5 in which sodium chloride was used in combination, were inferior.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Material Composition (AREA)
  • Materials Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

An object of the present invention is to provide a coagulant for a tire puncture repair liquid with excellent coagulability, and a tire puncture repair kit that uses the tire puncture repair liquid. The coagulant of the present invention coagulates a tire puncture repair liquid, and contains an α-starch and/or a dextrin having a weight average molecular weight of 3,000 to 50,000.

Description

    TECHNICAL FIELD
  • The present invention relates to a coagulant and a tire puncture repair kit.
    • BACKGROUND ART
  • Conventionally, a coagulant has been used to recover puncture repair liquid after a tire puncture has been repaired using a tire puncture repair liquid (a tire puncture sealing material).
  • For example, in Patent Document 1, the present inventors of the present invention suggests “an emulsion coagulant for coagulating a tire puncture sealing material containing emulsion particles, in which the emulsion coagulant contains a mineral that induces aggregation of the emulsion particles as a result of weakening a surface charge of the emulsion particles and/or as a result of hydrogen bonding with the emulsion particles, and a gelling agent” (claim 1).
  • In addition, in Patent Document 2, the present inventors suggests “a liquid coagulant that coagulates an emulsion containing natural rubber latex, in which the liquid coagulant has a pH of 2.0 to 4.0, and contains a urethane resin and/or an acrylic resin having a cationic functional group” (claim 1).
    • CITATION LIST Patent Literature
  • Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2009-041006A
  • Patent Literature 2: Japanese Unexamined Patent Application Publication No. 2011-246610A
    • SUMMARY OF INVENTION Technical Problem
  • The technical goal of the present invention is to provide a coagulant for a tire puncture repair liquid with excellent coagulability in the same manner as Patent Documents 1 and 2, and a tire puncture repair kit that uses the tire puncture repair liquid.
    • Solution to Problem
  • Following extensive investigation into the above-mentioned problem, the present inventors achieved the present invention by discovering that a coagulant that contains α-starch and/or a dextrin having a specific weight average molecular weight exhibits excellent coagulability of a puncture repair liquid.
  • That is, the present inventors discovered that the problems described above can be solved by the following features.
  • (1) A coagulant that coagulates a tire puncture repair liquid, the coagulant comprising at least one selected from the group consisting of an α-starch and a dextrin having a weight average molecular weight of 3,000 to 50000.
  • (2) The coagulant according to (1), in which the coagulant comprises at least the α-starch, and an amylopectin content of the α-starch is 75 mass % or more.
  • (3) The coagulant according to (1) or (2), in which the α-starch and the dextrin are used in combination.
  • (4) The coagulant according to any one of (1) to (3), further comprising at least one deliquescent inorganic salt selected from the group consisting of sodium chloride, potassium chloride and magnesium chloride.
  • (5) The coagulant according to any one of (1) to (4), in which the tire puncture repair liquid comprises at least one selected from the group consisting of a natural rubber latex and a synthetic resin emulsion.
  • (6) The coagulant according to (5), in which the tire puncture repair liquid further comprises an anti-freezing agent.
  • (7) The coagulant according to any one of (1) to (6), in which a used amount with respect to the tire puncture repair liquid is 5 to 150 parts by mass per 100 parts by mass of the tire puncture repair liquid.
  • (8) A tire puncture repair kit comprising the coagulant according to any one of (1) to (7) and a tire puncture repair liquid.
    • Advantageous Effects of Invention
  • As will be described below, according to the present invention, it is possible to provide a coagulant for a tire puncture repair liquid with excellent coagulability, and a tire puncture repair kit that uses the coagulant.
    • BRIEF DESCRIPTION OF DRAWINGS
  • FIGS. 1A to 1C are schematic cross-sectional views illustrating an example of a method for recovering tire puncture repair liquid, which uses the coagulant of the present invention.
    •  DESCRIPTION OF EMBODIMENTS Coagulant
  • The coagulant of the present invention coagulates a tire puncture repair liquid, and contains an α-starch and/or a dextrin having a weight average molecular weight of 3,000 to 50,000.
  • In addition, it is preferable that the coagulant of the present invention comprise at least one deliquescent inorganic salt selected from the group consisting of sodium chloride, potassium chloride and magnesium chloride.
  • In the present invention, the coagulability with respect to a tire puncture repair liquid is made favorable by using the α-starch and/or the dextrin.
  • Although the reason is not clear in detail, it is assumed to be as follows.
  • That is, with regards to the α-starch, it is thought that the coagulability is made favorable as a result of the tire puncture repair liquid being taken in between saccharide chains in which the hydrogen bond have been broken. In addition, with regards to the dextrin, it is thought that the coagulability is made favorable as a result of the absorbability of the tire puncture repair liquid being raised due to the molecular weight of starch being decreased by oxygen or the like.
  • Hereinafter, the α-starch, the dextrin and deliquescent inorganic salts that may be contained as desired will be described in detail.
    • α-Starch
  • The term α-starch refers to a starch in a state in which the hydrogen bonds between saccharide chains in the starch have been broken down and the saccharide chains are free, and more specifically, refers to processed starch in which starch that has been gelatinized by adding water to and heating non-gelatinized starch (hereinafter, also referred to as “raw material starch”), and dried rapidly.
  • Examples of the above-mentioned raw material starch include non-gelatinized starch separated from potatoes, wheat, rice, corn, sweet potato, cassava, arrowroot, dogtooth violet, broad bean, mung beans, red beans, and the like.
  • Additionally, the α-starch may be a starch on which processing treatment such as esterification, etherification, or cross-linking have been further carried out on α-starch.
  • In the present invention, from a viewpoint of further improving the coagulability, the amylopectin content of the α-starch is preferably 75 mass % or more, and is more preferably 75 to 90 mass %.
  • In this instance, it is thought that the reason for the coagulability being further improved is that branched structures in the α-starch are increased as a result of the amylopectin content being within the above-mentioned ranges, and that it is possible for more tire puncture repair liquid to be taken in between the saccharide chains as a result.
  • In addition, in the present invention, the “amylopectin content” can be measured using a method in which sedimentation and separation of amylopectin is performed by reacting a concanavalin A, which specifically bonds with amylopectin, with a sample.
    • Dextrin
  • The term dextrin refers to a substance in which the molecular weight of a starch has been decreased, and in the present invention, a dextrin with a weight average molecular weight of 3,000 to 50,000 is used.
  • In this instance, as the starch in which the molecular weight has been decreased, it is possible to use the same substance as the raw material starch of the above-mentioned α-starch.
  • In addition, the weight average molecular weight of the dextrin is an average molecular weight (expressed in terms of polyethylene glycol) that is measured by the gel permeation chromatography (GPC).
  • Additionally, the above-mentioned dextrin may be a substance that is dry degraded (a torrefaction dextrin), and may be a substance that is wet degraded (an acid-treated starch, an oxidized starch, or an enzyme modified starch).
  • In the present invention, from a viewpoint of further improving the coagulability, the weight average molecular weight of the dextrin is preferably 20,000 to 50,000, and is more preferably 20,000 to 40,000.
  • The coagulant of the present invention is not particularly limited as long as it contains the α-starch and/or the dextrin, but from a viewpoint of further improving the coagulability, it is preferable that the α-starch and the dextrin be used in combination.
  • The reason for such an effect being exhibited is not clear, but it is thought that the dextrin takes up (absorb) the tire puncture repair liquid quickly, and thereafter, the α-starch coagulates the taken-in tire puncture repair liquid, that is, the functional disassociation of absorption and coagulation is achieved.
  • In addition, the coagulant of the present invention preferably contains 50 to 100 mass % of the α-starch and/or the dextrin with respect to the total mass of the coagulant, and more preferably contains 60 to 95 mass %.
  • Additionally, in a case of combined use of the α-starch and the dextrin, the above-mentioned mass % refers to the total mass %.
    • Deliquescent Inorganic Salt
  • From a viewpoint of it being possible to reduce an amount used with respect to a tire puncture repair liquid, it is preferable that the coagulant of the present invention include at least one deliquescent inorganic salt selected from the group consisting of sodium chloride, potassium chloride and magnesium chloride.
  • In this instance, the term “deliquescent” refers to a property of forming an aqueous solution by absorbing water (moisture) in air.
  • In the present invention, the content of the deliquescent inorganic salt is preferably 5 to 100 parts by mass per 100 parts by mass of the total of the α-starch and the dextrin (or the corresponding component in a case in which only either one is included), more preferably 5 to 50 parts by mass, and still more preferably 10 to 30 parts by mass.
    • Other Optional Components
  • For example, in addition to the above-mentioned components, the coagulant of the present invention can include additives such as a filler, an anti-aging agent, an antioxidant, a pigment (dye), a plasticizer, a thixotropic agent, a UV absorbent, a flame retardant, a surfactant, a dispersant, a dehydrating agent, or an antistatic agent as desired according to necessity.
    • Production Method
  • The production (preparation) method of the coagulant of the present invention is not particularly limited, and for example, it is possible to produce the coagulant by uniformly blending the α-starch and/or the dextrin, and the deliquescent inorganic salt and additives, which are optional components.
    • Tire Puncture Repair Liquid
  • A tire puncture repair liquid that is coagulated by the coagulant of the present invention is not particularly limited.
  • Examples of the tire puncture repair liquid include a repair liquid that contains a natural rubber latex and/or a synthetic resin emulsion, a repair liquid that contains an anti-freezing agent in addition to these, or the like.
  • Additionally, in a synthetic resin emulsion, the phase of the synthetic resin, which is a dispersoid, may be a liquid phase or may be a solid phase.
  • That is, in general, a system in which a liquid phase dispersoid is dispersed in a liquid phase dispersion medium is referred to as an “emulsion”, and a system in which a solid phase dispersoid is dispersed in a liquid phase dispersion medium is referred to as a “suspension”, but in the present invention, the term “emulsion” includes the definition of a “suspension”.
    • Natural Rubber Latex
  • The natural rubber latex is not particularly limited, and a conventionally-known natural rubber latex can be used.
  • More specifically, examples of the natural rubber latex include a natural rubber latex that is extracted by tapping of Hevea brasiliensis, a so-called “deproteinized natural rubber latex” in which proteins have been removed from a natural rubber latex, and the like.
    • Synthetic Resin Emulsion
  • The synthetic resin emulsion is not particularly limited, and it is possible to use a conventionally-known synthetic resin emulsion.
  • More specifically, examples of the synthetic resin emulsion include a urethane emulsion, an acrylic emulsion, a polyolefin emulsion, an ethylene vinyl acetate copolymer emulsion, a polyvinyl acetate emulsion, an ethylene-vinyl acetate-vinyl versatate copolymer emulsion, a polyvinyl chloride emulsion, and the like, and a single type thereof may be used independently, or two or more types may be used in combination.
    • Antifreezing Agent
  • The antifreezing agent is not particularly limited, and it is possible to use a conventionally-known antifreezing agent.
  • More specifically, examples of the antifreezing agent include ethylene glycol, propylene glycol, diethylene glycol, glycerin, methanol, ethanol, isopropyl alcohol and the like, and a single type thereof may be used independently, or two or more types may be used in combination.
    • Additives
  • In addition to each of the above-mentioned components, the tire puncture repair liquid that is coagulated by the coagulant of the present invention can include various additives such as a filler, an anti-aging agent, an antioxidant, a pigment (dye), a plasticizer, a thixotropic agent, a UV absorbent, a flame retardant, a surfactant (including a leveling agent), a dispersant, a dehydrating agent, or an antistatic agent as desired according to necessity.
  • In the present invention, a used amount of the coagulant with respect to such a tire puncture repair liquid is preferably 5 to 150 parts by mass per 100 parts by mass of the tire puncture repair liquid, more preferably 5 to 100 parts by mass, and still more preferably 10 to 50 parts by mass.
  • Examples of the form (for example, the usage form or marketing form) of the coagulant of the present invention include individual use of the coagulant, and a set including the coagulant and a tire puncture repair liquid (a tire puncture repair kit).
    • Recovery Method
  • A method for recovering puncture repair liquid that uses the coagulant of the present invention (hereinafter, also referred to as a “use method of the coagulant of the present invention”) will be described below using FIGS. 1A to 1C. Additionally, the use method of the coagulant of the present invention is not particularly limited to the aspect that is illustrated in FIGS. 1A to 1C.
  • FIGS. 1A to 1C are schematic cross-sectional views illustrating an example of a method for recovering tire puncture repair liquid, which uses the coagulant of the present invention.
  • Firstly, as illustrated in FIG. 1A, a valve core (not illustrated in the drawing) is detached from a tire valve 3 of a wheel 2 in which a tire puncture repair liquid 4 is injected inside a pneumatic tire 1.
  • Next, as illustrated in FIG. 1B, a tube 5 is inserted inside the pneumatic tire 1 via the tire valve 3.
  • Subsequently, as illustrated in FIG. 1C, when the tip end of the tube 5, which is inserted, reaches the liquid surface of the tire puncture repair liquid 4, the tire puncture repair liquid 4 flows backward from inside the pressurized pneumatic tire 1 through the tube 5, and it is possible to recover the tire puncture repair liquid in a recovery pouch 7 into which the coagulant 6 is inserted in advance.
    • Tire Puncture Repair Kit
  • The tire puncture repair kit of the present invention includes the coagulant of the present invention and a tire puncture repair liquid.
  • In this instance, the tire puncture repair liquid in the tire puncture repair kit of the present invention is the same as the above-mentioned tire puncture repair liquid that is described as the target for coagulation by the coagulant of the present invention.
  • In addition, the used amount (a solid content) of the coagulant of the present invention when sealing a puncture hole using the tire puncture repair kit of the present invention is the same as the above-mentioned used amount of the coagulant of the present invention with respect to the tire puncture repair liquid, and is preferably 5 to 150 parts by mass per 100 parts by mass of the tire puncture repair liquid, more preferably 10 to 100 parts by mass, and still more preferably 10 to 50 parts by mass.
    • EXAMPLES
  • The present invention will now be described in greater detail using the following working examples, but is in no way limited to these examples.
    • Preparation of Tire Puncture Repair Liquid
  • Tire puncture repair liquids A and B were prepared by mixing the components of the tire puncture repair liquids A and B, which are shown in Table 1 below, at the quantities (unit: parts by mass) shown in the table using an agitator.
  • TABLE 1
    Table 1
    Repair liquid A Repair liquid B
    Emulsion
    1 30 60
    Emulsion 2 30 0
    Antifreezing agent 40 40
    Surfactant A 0.9 2.5
    Surfactant B 0.15 0.5
    Total Quantity 101.05 103
    Solid content (%) 32.6 34.5
  • The details of each of the components of the tire puncture repair liquids A and B shown in Table 1 are as follows.
  • Emulsion 1: natural rubber emulsion (HA Latex, solid content: 60 mass %, produced by Golden Hope Co., Ltd.)
  • Emulsion 2: ethylene vinyl acetate emulsion (solid content: 51 mass %, Sumika Flex S-408HQE, produced by Sumika Chemtex Co., Ltd.)
  • Antifreezing agent: polypropylene glycol (solid content: 100 mass %, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Surfactant A: sodium dodecyl sulfate (produced by Wako Pure Chemical Industries Co., Ltd.)
  • Surfactant B: Polyoxyethylene alkyl ether (Emulgen 109, manufactured by Kao Corporation)
    • Production of Coagulant Working Examples 1 to 34, 35 and 36, and Comparative Examples 1 to 5
  • Coagulants were prepared by mixing the starch A, the α-starches B to I and/or the dextrins J to R components, which are shown in Table 2 below, at the quantities (unit: parts by mass) shown in the table using an agitator.
    • Evaluation: Coagulability Performance
  • Coagulants prepared using Working Examples 1 to 34, 35 and 36, and Comparative Examples 1 to 5 were added with the parts by mass shown in Table 2 per 100 parts by mass of either the tire puncture repair liquids A or B prepared in the manner mentioned above, and stirred.
  • After stirring, the mixtures were kept at 20° C., and the time (coagulation time) until fluidity is lost without the liquid content oozing out from the mixture of the tire puncture repair liquid and the coagulant was measured.
  • As a result of this, mixtures for which the coagulation time was within 30 minutes were evaluated as “⊚” having particularly excellent coagulability, mixtures for which the coagulation time was within 60 minutes were evaluated as “∘” having excellent coagulability, mixtures for which the coagulation time was longer than 60 minutes but within 12 hours were evaluated as “Δ” there not being a problem with practical use thereof, and mixtures for which the coagulation time was longer than 12 hours were evaluated as “×” having inferior coagulability.
  • TABLE 2
    Table 2-I
    Amylopectin Average Comparative Working Comparative
    content Molecular Example Examples Examples
    (Mass %) Weight 1 1 2 3 4 5 6 7 8 2 3
    Starch A 60 100
    α-starch B 50 100
    C 60 100
    D 70 100
    E 72 100
    F 75 100
    G 78 100
    H 83 100
    I 100 100
    Dextrin J 2000 100
    K 2500 100
    L 3000
    M 5000
    N 10000
    O 30000
    P 40000
    Q 50000
    R 70000
    Used amount per 100 parts 100 100 100 100 100 100 100 100 100 100 100
    by mass of puncture
    repair fluid A
    Coagulability Performance X Δ Δ Δ ◯ ⊚ ⊚ ⊚ ⊚ X X
    Amylopectin Working Comparative Working
    content Examples Examples Examples
    (Mass %) 9 10 11 12 13 14 4 15 16 17 18 19 20 21
    Starch A 60
    α-starch B 50
    C 60
    D 70 50
    E 72
    F 75 20 25 30
    G 78 70
    H 83 5
    I 100
    Dextrin J
    K
    L 100 100
    M 100
    N 100
    O 100 50 30 95
    P 100 80 75 70
    Q 100
    R 100
    Used amount per 100 parts 100 100 100 100 100 100 100 100 100 100 100 100 100 100
    by mass of puncture
    repair fluid A
    Coagulability Performance Δ Δ Δ ◯ ◯ ◯ X ◯ ◯ ◯ ◯ ◯ ◯ ◯
  • TABLE 3
    Table 2-2
    Amylopectin Average Working Comparative Working
    content Molecular Examples Examples Examples
    (Mass %) Weight 22 23 24 25 26 27 28 29 30 31 32 33 34 5 35 36
    Starch A 60 100
    α-starch B 50
    C 60 40
    D 70
    E 72
    F 75 20 30
    G 78 70 50 50 50 50 50 70 100 50 70
    H 83 45
    I 100 65
    Dextrin J 2000
    K 2500
    L 3000
    M 5000
    N 10000
    O 20000 60
    P 30000 80 70
    Q 35000 30 55 50 50 50 50 50 30 50 30
    R 40000 35
    Deliquescent Sodium 5 10 50 100 10 20 10
    inorganic salt chloride
    Potassium
    5 20 20 20
    chloride
    Magnesium 30 20 20 20
    chloride
    Used amount per 100 parts 10 10 10 10 10 10 25 35 50 75 100 20 50 30
    by mass of puncture
    repair fluid A
    Used amount per 100 parts 25 10
    by mass of puncture
    repair fluid B
    Coagulability Performance ◯ ◯ ⊚ ◯ ◯ ◯ ⊚ ⊚ ⊚ ⊚ ⊚ ◯ ◯ X ⊚ ⊚
  • The details of the coagulants shown in Table 2 are as follows.
  • Starch A: Reagent (amylopectin content: 60 mass %, produced by Wako Pure Chemical Industries Co., Ltd.)
  • α-starch B: Reagent (amylopectin content: 50 mass %, produced by Wako Pure Chemical Industries Co., Ltd.)
  • α-starch C: Reagent (amylopectin content: 60 mass %, produced by Wako Pure Chemical Industries Co., Ltd.)
  • α-starch D: α-wheat starch (amylopectin content: 70 mass %, produced by Nippon Flour Mills Co., Ltd.)
  • α-starch E: α-white bean (amylopectin content: 72 mass %, produced by Nippon Flour Mills Co., Ltd.)
  • α-starch F: α-corn (amylopectin content: 75 mass %, produced by Sanwa Starch Co. Ltd.)
  • α-starch G: α-red bean (amylopectin content: 78 mass %, produced by Sanwa Starch Co. Ltd.)
  • α-starch H: α-tapioca (amylopectin content: 83 mass %, produced by Sanwa Starch Co. Ltd.)
  • α-starch I: α-glutinous rice (amylopectin content: 100 mass %, produced by Nippon Flour Mills Co., Ltd.)
  • Dextrin J: Reagent (weight average molecular weight: 2,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin K: Reagent (weight average molecular weight: 2,500, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin L: Reagent (weight average molecular weight: 3,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin M: Reagent (weight average molecular weight: 5,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin N: Reagent (weight average molecular weight: 10,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin O: Reagent (weight average molecular weight: 30,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin P: Reagent (weight average molecular weight: 40,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin Q: Reagent (weight average molecular weight: 50,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Dextrin R: Reagent (weight average molecular weight: 70,000, produced by Wako Pure Chemical Industries Co., Ltd.)
  • Deliquescent Inorganic Salt: Sodium chloride (produced by Wako Pure Chemical Industries Co., Ltd.)
  • Deliquescent Inorganic Salt: Potassium chloride (produced by Wako Pure Chemical Industries Co., Ltd.)
  • Deliquescent Inorganic Salt: Magnesium chloride (produced by Wako Pure Chemical Industries Co., Ltd.)
  • As is evident from the results shown in Table 2, it was found that the coagulability performances of
  • Comparative Example 1, which used starch, and Comparative Example 5, in which sodium chloride was used in combination, were inferior.
  • In the same manner, the coagulability performances of both Comparative Examples 2 and 3, in which a dextrin with a small weight average molecular weight was used, and Comparative Example 4, in which a dextrin with a large weight average molecular weight was used, were inferior.
  • In contrast to this, it was found that the coagulability performances of all of Working Examples 1 to 36, in which an α-starch and/or a dextrin with a weight average molecular weight of 3,000 to 50,000 were used, were excellent.
  • In particular, it was found that the coagulability performances of Working Examples 5 to 8, in which α-starches with an amylopectin content of 75 mass % or more were used, were more favorable.
  • In addition, it was found that, as a result of the combined use of the α-starch and the dextrin, the combined use of the deliquescent inorganic salt and the like, there is a tendency for the coagulability performance to be favorable even if the used amount with respect to the tire puncture repair liquid is reduced (Working Examples 22 to 36).
    • REFERENCE SIGNS LIST
    • 1 Pneumatic tire
    • 2 Wheel
    • 3 Tire valve
    • 4 Tire puncture repair liquid
    • 5 Tube
    • 6 Coagulant
    • 7 Recovery pouch

Claims (20)

1. A coagulant that coagulates a tire puncture repair liquid, the coagulant comprising an α-starch and a dextrin having a weight average molecular weight of 3,000 to 50,000.
2. The coagulant according to claim 1, wherein the coagulant comprises at least the α-starch, and an amylopectin content of the α-starch is 75 mass % or more.
3. (canceled)
4. The coagulant according to claim 1, further comprising
at least one deliquescent inorganic salt selected from the group consisting of sodium chloride, potassium chloride and magnesium chloride.
5. The coagulant according to claim 1, wherein the tire puncture repair liquid comprises at least one selected from the group consisting of a natural rubber latex and a synthetic resin emulsion.
6. The coagulant according to claim 5, wherein the tire puncture repair liquid further comprises an anti-freezing agent.
7. The coagulant according to claim 1, wherein a used amount with respect to the tire puncture repair liquid is 5 to 150 parts by mass per 100 parts by mass of the tire puncture repair liquid.
8. A tire puncture repair kit comprising: the coagulant according to claim 1; and a tire puncture repair liquid.
9. The coagulant according to claim 2, further comprising
at least one deliquescent inorganic salt selected from the group consisting of sodium chloride, potassium chloride and magnesium chloride.
10. The coagulant according to claim 2, wherein the tire puncture repair liquid comprises at least one selected from the group consisting of a natural rubber latex and a synthetic resin emulsion.
11. The coagulant according to claim 4, wherein the tire puncture repair liquid comprises at least one selected from the group consisting of a natural rubber latex and a synthetic resin emulsion.
12. The coagulant according to claim 2, wherein a used amount with respect to the tire puncture repair liquid is 5 to 150 parts by mass per 100 parts by mass of the tire puncture repair liquid.
13. The coagulant according to claim 4, wherein a used amount with respect to the tire puncture repair liquid is 5 to 150 parts by mass per 100 parts by mass of the tire puncture repair liquid.
14. The coagulant according to claim 5, wherein a used amount with respect to the tire puncture repair liquid is 5 to 150 parts by mass per 100 parts by mass of the tire puncture repair liquid.
15. The coagulant according to claim 6, wherein a used amount with respect to the tire puncture repair liquid is 5 to 150 parts by mass per 100 parts by mass of the tire puncture repair liquid.
16. A tire puncture repair kit comprising: the coagulant according to claim 2; and a tire puncture repair liquid.
17. A tire puncture repair kit comprising: the coagulant according to claim 4; and a tire puncture repair liquid.
18. A tire puncture repair kit comprising: the coagulant according to claim 5; and a tire puncture repair liquid.
19. A tire puncture repair kit comprising: the coagulant according to claim 6; and a tire puncture repair liquid.
20. A tire puncture repair kit comprising: the coagulant according to claim 7; and a tire puncture repair liquid.
US14/908,449 2013-08-01 2014-08-01 Coagulant and tire puncture repair kit Abandoned US20160185052A1 (en)

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KR101610815B1 (en) 2016-04-08
DE112014003517T5 (en) 2016-04-28

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