US20140329102A1 - Water-Based Adhesives - Google Patents

Water-Based Adhesives Download PDF

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Publication number
US20140329102A1
US20140329102A1 US14/363,230 US201214363230A US2014329102A1 US 20140329102 A1 US20140329102 A1 US 20140329102A1 US 201214363230 A US201214363230 A US 201214363230A US 2014329102 A1 US2014329102 A1 US 2014329102A1
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United States
Prior art keywords
adhesive
rubber
combinations
reinforcing filler
phr
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Abandoned
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US14/363,230
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English (en)
Inventor
Amy M. Randall
William L. Hergenrother
Sheel Agarwal
Ashley S. Hilton
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Bridgestone Corp
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Bridgestone Corp
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Priority to US14/363,230 priority Critical patent/US20140329102A1/en
Assigned to BRIDGESTONE CORPORATION reassignment BRIDGESTONE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HERGENROTHER, WILLIAM L., AGARWAL, SHEEL, RANDALL, AMY M., HILTON, ASHLEY S.
Publication of US20140329102A1 publication Critical patent/US20140329102A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J111/00—Adhesives based on homopolymers or copolymers of chloroprene
    • C09J111/02—Latex
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/042—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/01—Hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/14—Glass
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J107/00—Adhesives based on natural rubber
    • C09J107/02—Latex
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J121/00—Adhesives based on unspecified rubbers
    • C09J121/02—Latex
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/54—Retreading
    • B29D2030/544—Applying an intermediate adhesive layer, e.g. cement or cushioning element between carcass and tread
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/248—All polymers belonging to those covered by group B32B25/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31826—Of natural rubber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31826—Of natural rubber
    • Y10T428/3183—Next to second layer of natural rubber

Definitions

  • This disclosure relates to adhesives, particularly water-based adhesives for rubber compositions in the tire and air spring industry.
  • Rubber air springs and tires include separate rubber components that are joined with adhesives.
  • Retread tires also may employ adhesive to join the new tread to the carcass, or to adhere an intermediate cushion layer to a carcass and/or a tread.
  • Rubber adhesives may be used to provide tack to a rubber component while a rubber article is cured or stored.
  • an adhesive includes a polymeric latex, a penetrant selected from the group consisting of: terpenes, polylimonene, limonene, carvone, ⁇ -pinene, citral, dipentene, 1,8-cineole, eucalyptol, citronellol, geraniol, citronellene, terpinen-4-ol, borneol, camphor, guayule resin, and combinations thereof; and a reinforcing filler.
  • the adhesive has a solids content of about 35 to about 65% and a pH of about 9 to 12.
  • an article of manufacture includes an elastomeric rubber component comprising an elastomer selected from the group consisting of: polychloroprene, butyl rubber, hevea and non-hevea derived natural rubber, polyisoprene, polybutadiene, nitrile rubber, poly(styrene-butadiene), and combinations thereof.
  • the elastomeric rubber component is joined at an interface with a second rubber component or another portion of the elastomeric rubber component.
  • the interface includes a layer of adhesive, which comprises: a polymeric latex; a penetrant selected from the group consisting of: terpenes, polylimonene, limonene, carvone, ⁇ -pinene, citral, dipentene, 1,8-cineole, eucalyptol, citronellol, geraniol, citronellene, terpinen-4-ol, borneol, camphor, guayule resin, and combinations thereof; and a reinforcing filler.
  • a layer of adhesive which comprises: a polymeric latex; a penetrant selected from the group consisting of: terpenes, polylimonene, limonene, carvone, ⁇ -pinene, citral, dipentene, 1,8-cineole, eucalyptol, citronellol, geraniol, citronellene, terpinen-4-ol, borneol
  • a method includes the steps of: mixing together an adhesive composition comprising: a polymeric latex; a penetrant selected from the group consisting of: terpenes, polylimonene, limonene, carvone, ⁇ -pinene, citral, dipentene, 1,8-cineole, eucalyptol, citronellol, geraniol, citronellene, terpinen-4-ol, borneol, camphor, guayule resin, and combinations thereof; and a reinforcing filler.
  • a penetrant selected from the group consisting of: terpenes, polylimonene, limonene, carvone, ⁇ -pinene, citral, dipentene, 1,8-cineole, eucalyptol, citronellol, geraniol, citronellene, terpinen-4-ol, borneol, camphor, guayule resin
  • FIG. 1 is a partial cross-sectional view of an embodiment of an air spring.
  • FIG. 2 is a cross-sectional view of a portion of an embodiment of a tire.
  • FIG. 3 is a cross-sectional view of a portion of an embodiment of a retreaded tire.
  • a water-based, low VOC, latex adhesive for joining rubber interfaces.
  • the adhesive may be useful in a variety of applications. Particular examples of applications include those that require strong rubber-to-rubber joints and that are utilized to provide an air barrier, such as air springs and tire components. Application of new tread to retreaded tires is another application where the composition described herein may have particular utility.
  • the adhesive includes the following components: an aqueous polymeric latex, a penetrant, a reinforcing filler, a tackifier, and a stabilizer.
  • an aqueous polymeric latex e.g., polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl
  • the polymeric latex of the adhesive may be an aqueous emulsion of elastomers such as hevea and non-hevea (including guayule) natural rubber, polyisoprene, poly(styrene-butadiene), poly(isoprene-styrene), poly(isoprene-butadiene), polybutadiene, polychloroprene, nitrile rubber, butyl rubber, and combinations thereof.
  • elastomers such as hevea and non-hevea (including guayule) natural rubber, polyisoprene, poly(styrene-butadiene), poly(isoprene-styrene), poly(isoprene-butadiene), polybutadiene, polychloroprene, nitrile rubber, butyl rubber, and combinations thereof.
  • the polymeric portion of the latex may have a weight average molecular weight (Mw) of about 100,000 to about 30,000,000 g/mol, such as about 100,000 to about 10,000,000 g/mol or about 100,000 to about 5,000,000 g/mol and a number average molecular weight (Mn) of about 100,000 to about 30,000,000 g/mol, such as about 100,000 to about 10,000,000 g/mol or about 100,000 to about 5,000,000 g/mol.
  • Mw weight average molecular weight
  • Mn number average molecular weight
  • the polymer portion may have a Tg of about ⁇ 110° C. to about 10° C., such as about ⁇ 110° C. to about ⁇ 10° C. or about ⁇ 110° C. to about ⁇ 25° C.
  • the polymeric latex may have a solids content of about 10% to about 90%, such as about 20% to about 80%, or about 30% to about 70%.
  • the pH of the polymeric latex may be about 7 to about 14, such as about 8 to about 13 or about 9 to about 12.
  • the penetrant component when the adhesive is applied to an elastomer substrate, the penetrant component operates to open up the interstices of the polymeric matrix of the elastomer it is applied to. This allows the adhesive composition to have better penetration and intermingling with the substrate elastomer. The surface area of the interface between the adhesive and the elastomer substrate is also increased.
  • the penetrant is selected from terpenes, such as polylimonene, limonene, ⁇ -pinene, dipentene, citronellene; or from the group consisting of carvone, citral, 1,8-cineole, eucalyptol, citronellol, geraniol, terpinen-4-ol, borneol, camphor, and combinations thereof.
  • the penentrant is substantially or completely free of VOCs.
  • the penetrant is guayule resin.
  • guayule resin means the naturally occurring non-rubber chemical entities present in guayule shrub matter. These chemical entities include, but are not limited to, resins (such as terpenes), fatty acids, proteins, and inorganic materials, and include both polar and non-polar moieties. Guayule resin can result from the isolation of rubber from guayule shrub using organic solvent based processes. The resin represents the dried fraction (i.e., solvent removed) of material isolated in the polar organic solvent phase from such a process.
  • the guayule resin can be added as guayule rubber latex, such latex including both the guayule rubber and the guayule resin for use as the penetrant.
  • two components of the adhesive may be fulfilled by one source material.
  • purified guayule latex comprising 5% or less, alternatively 3% or less, or 1% or less guayule resin may be used in the adhesive composition.
  • the penetrant is added separately, and may include guayule resin.
  • the reinforcing filler component provides improved strength and durability to the adhesive composition. This is in contrast to many adhesives that use no or very little reinforcing filler. For example, some adhesive manufacturers may use carbon black in very small amounts to tint the adhesive, but not in reinforcing amounts.
  • the reinforcing filler is carbon black, such as reinforcing grade carbon black.
  • examples include carbon black in the N100, N200, and N300 series.
  • a higher surface area carbon black may provide improved performance.
  • the carbon black may have an N 2 SA surface area of about 10 to about 150 m 2 /g, such as about 20 to about 140 m 2 /g or about 30 to about 130 m 2 /g.
  • an aqueous carbon black dispersion may be used.
  • the dispersion contains carbon black in an amount from about 20% to about 50% by weight of the dispersion and the dispersion has a pH from about 7 to about 12.
  • Aqueous carbon black dispersions which may be employed include, for example, AQUABLAK 5101, which is available from Solution Dispersions, and includes a N100 series carbon black with 40% solids and pH of 10-1, and is stabilized with anionic and non-ionic surfactants.
  • the reinforcing fillers may be present in the adhesive in an amount of about 10 to about 80 phr (“per hundred rubber” is a by weight measure, and is based on the weight of the polymer in the polymeric latex set to 100), for example, about 15 to about 60 phr, or about 20 to about 40 phr.
  • Tackifiers that may be employed include, for example, TACOLYN 5003, TACOLYN 5070, or AQUATAC 6025.
  • TACOLYN 5003 and 5070 are from EASTMAN CHEMICAL COMPANY, and they are aliphatic hydrocarbon resin tackifiers with a softening point of 70-130° C. and a solids content of 45-50%.
  • AQUATAC 6025 is from ARIZONA CHEMICAL, Co., and has a softening point of 26° C. and a solids content of 59-63%.
  • the tackifier may be present in an amount of about 5 to about 40 phr, such as about 10 to about 35 phr, or about 15 to about 30 phr.
  • the tackifier has a pH of about 2 to about 13, such as about 3 to about 12, or about 4 to about 11 and a solids content of about 30 to about 80%, such as about 35 to about 75%, or about 40 to about 70%.
  • the tackifier has a softening point of about 5 to about 170° C., such as about 15 to about 150° C., or about 25 to about 130° C.
  • the stabilizer component aids in keeping the composition in a latex emulsion state.
  • An example class of stabilizers is non-ionic surfactants, such as IGEPAL CO-887, which is a non-ionic surfactant from Rhodia Group.
  • IGEPAL CO-887 is a nonylphenoxy poly(ethyleneoxy)ethanol surfactant stabilizer with a 70% solids content.
  • Other examples of stabilizers that may be used in embodiments of the adhesive composition include: PLURONIC F-68 from BASF, probenecid (4-(dipropylsulfamoyl)benzoic acid), tetraethyl orthosilicate, TWEEN 80 , and acryloamido-2-methyl-1-propanesulfonic acid.
  • the stabilizer may also be present in the polymeric latex component, rather than as a separately added component.
  • the stabilizer may be present in an amount of about 0 to about 10 phr, such as about 1 to about 6 phr, or about 2 to about 4 phr.
  • the stabilizer has a pH of about 5 to about 13, such as about 6 to about 12, or about 7 to about 11 and a solids content of about 35 to about 85%, such as about 40 to about 80%, or about 45 to about 75%.
  • the composition is substantially or completely free of cure agents, such as, for example, sulfur or peroxide.
  • substantially free in this context means that no cure agents are added for the purpose of curing the composition, and are only present for another purpose in the composition or as accidental contaminants, for example, less than 1 phr or less than 0.1 phr.
  • cure agents may also be used in conventional quantities. Without being bound by theory, it is believed that the cure agents and accelerators that leach out of the elastomer substrate that the adhesive is applied to are sufficient to impart a cure to the adhesive under curing conditions. The penetrant is believed to aid in leaching sufficient quantities of the cure agent and accelerators from the elastomer substrate.
  • the entire adhesive composition will have a pH of about 7 to about 14, such as about 8 to about 13, or about 9 to about 12, and a solids content of about 25 to about 75%, such as, about 30% to about 70%, or about 35 to about 65%.
  • the adhesive will be substantially or completely free of VOCs.
  • a volatile organic compound (VOC) is any carbon-based compound that will vaporize at standard room temperatures. There are many organic compounds that fall into this category, with methane, formaldehyde and acetone among the most prevalent and well-known VOCs. These compounds are produced through natural biological processes as well as through chemical reactions in manufacturing and industry. Whether a composition is free or substantially free of VOCs is based upon its vapor pressure.
  • the components listed above are mixed together at ambient temperature. Namely, the polymeric latex, the penetrant, the reinforcing filler, the tackifier, and the stabilizer are mixed together. In another embodiment, either the penetrant or the stabilizer or both may be omitted.
  • the components may be added sequentially or simultaneously, in the order they are listed above or in a different order.
  • the components may be sequentially added and allowed to slowly rotate in a closed vessel long enough to ensure mixing and good dispersion, such as at least 24 hours.
  • the adhesive composition thus formed may be applied to a substrate such as a cured or an uncured rubber composition by, for example, rolling, spraying, or extruding it onto the substrate. After application to an uncured rubber substrate the adhesive and the uncured composition may be then cured under conditions necessary for the substrate to cure. Without being bound by theory, the cure agent and accelerators in the substrate are believed to leach into the adhesive in a sufficient quantity to cause the adhesive to cure also.
  • the substrates that the adhesive may be utilized to join include elastomeric rubber substrates such as rubber compositions that have as the polymeric component polychloroprene, butyl rubber, hevea and non-hevea natural rubber, polyisoprene, polybutadiene, nitrile rubber, poly(isoprene-styrene), poly(isoprene-butadiene), poly(styrene-butadiene), and combinations thereof.
  • the adhesive may also have some utility for bonding metals, wood, and other types of substrates.
  • FIG. 1 shows an embodiment of a reversible sleeve air spring 10
  • the air spring assembly 10 includes flexible airsleeve 12 .
  • Bead plate 14 is crimped to airsleeve 12 to form an airtight seal between the bead plate 14 and airsleeve 12 .
  • end closure 16 is molded to the flexible airsleeve 12 to form an airtight seal between end closure 16 and airsleeve 12 .
  • End closure 16 of airsleeve 12 is affixed to piston 18 by mechanical means well known in the art, including, for example, a piston bolt (not shown). Piston 18 provides a surface for the flexible airsleeve 12 to roll on during compressive travel.
  • the reversible air spring assembly 10 may optionally include a bumper 20 to support the vehicle when there is no air in the air springs or during extreme road disturbances. Enclosed within airsleeve 12 is a volume of gas 22 . Studs 24 and hole 26 are used to secure the reversible air spring assembly 10 to the mounting surface of an automobile (not shown).
  • the application adhesive is applied between rubber layers for air-springs to securely join them at an interface.
  • rubber layers for air-springs to securely join them at an interface.
  • Air springs are widely used in large vehicles, such as buses and trucks, because they allow fixedly holding a vehicle's posture against a load change from curb weight to payload weight by controlling the supply of air and the discharge of air to the exterior.
  • the spring constant can be set to a low level to improve the ride comfort and prevent the damage of freight.
  • Typical air spring rubber compositions include one or more diene polymers, such as polychloroprene; a reinforcing filler, such as carbon black, in an amount such as 20-100 phr; a cure agent, accelerators, wax, plasticizing oil, antioxidants, and other additives.
  • diene polymers such as polychloroprene
  • a reinforcing filler such as carbon black
  • a cure agent such as accelerators, wax, plasticizing oil, antioxidants, and other additives.
  • FIG. 2 shows a cross-section of a tire 100 .
  • the adhesive is applied to various rubber components of the tire 100 including, but not limited to, new tire construction or existing tire retreading.
  • the adhesive may be applied to join a spliced tread 110 , a spliced inner liner 120 , or a spliced bead 130 , or to join a sidewall 140 or a carcass layer 150 to the tread 110 .
  • the cured tread and the cured tire carcass are joined together by combining a cushion layer.
  • the retreaded tire is then heated in a standard set of conditions to allow for curing to occur.
  • the adhesive may be applied to join a cushion layer 302 to a retreaded carcass 306 or a cushion layer to a new tread 304 , as shown in FIG. 3 .
  • An example of a retread tire and a method for retreading is disclosed in U.S. Pat. No. 5,603,366, which is incorporated herein by reference.
  • Typical tire rubber compositions include one or more diene polymers, reinforcing filler, such as carbon black, in an amount such as 40-100 phr, sulfur (cure agent), accelerators, plasticizing oil, antioxidants, and other additives.
  • New tires are constructed by assembling the individual components in an uncured (green) state, and then, once assembled, the green tire is cured as a whole.
  • An example tire manufacturing method is disclosed in U.S. Pat. No. 4,824,501, which is incorporated herein by reference.
  • the adhesive described herein is well-suited for use in the manufacture of rubber articles such as tires and air springs.
  • the example adhesives were prepared by sequentially mixing the components listed in Table 1 and allowing them to slowly rotate in a closed vessel for at least 24 hours to ensure mixing and good dispersion.
  • the final example adhesives had solids contents in the range of 35-65% and a pH in the range of 9-12.
  • Examples 3-10 were performed to test the tackiness and the strength/durability of the Example 1 and 2 adhesives in comparison to other adhesives and against a stock to stock control when applied to a neoprene rubber composition.
  • Neoprene rubber is commonly used in air springs.
  • Examples 3-6 were prepared to measure the uncured (green) peel strength. This measurement primarily shows the tackiness of the joint. This indicates an initial adhesiveness to hold a joint together temporarily until it can be cured.
  • Examples 7-10 were prepared to measure the cured peel strength, which shows the strength and durability of the final cured joint.
  • the application of the adhesive onto the green rubber stock was done with a foam/sponge brush, in order to get a thin uniform layer of application.
  • the adhesive was allowed to dry at room temperature for one hour before the uncured samples were tested, and before the cured samples were cured by heating at 171° C. for 11.5 min.
  • Example 3 no adhesive was applied.
  • Example 3 two uncured neoprene stocks were applied together in an uncured state.
  • Example 7 the neoprene stocks were applied together uncured and then later cured. This provides a very strong bond, because the same material is being contacted and cured together.
  • the joint is only slightly weaker than an unjointed piece of rubber, partly because some contaminants may bloom to the surface of the joint and contaminate the curing at the joint. Accordingly, these Examples are considered control examples, not comparative Examples.
  • Examples 4 and 8 were neoprene rubber strips joined with a hexane solvent-based adhesive made from natural rubber and styrene-butadiene rubber.
  • Examples 5, 6, 9, and 10 employed the adhesives made in Examples 1 and 2.
  • Examples 11-18 are analogs to Examples 3-10, only differing in that a different Neoprene rubber was used.
  • the Neoprene rubbers 1 and 2 were copolymers of chloroprene and 2,3-dichloro-1,3-butadiene.
  • Neoprene rubber 1 had a Mooney viscosity of about 100-120, and neoprene rubber 2 had a Mooney viscosity of about 41-51.
  • Neoprene rubber Solvent 0.0435 (Compar- 1 Cured Adhesive ative)
  • Neoprene rubber Stock-to- 0.0530 Control) 2 no cure (green) Stock (none)
  • Neoprene rubber Solvent 0.0400 Compar- 2 no cure (green) Adhesive ative
  • Neoprene rubber Example 1 0.710 2 no cure (green)
  • Neoprene rubber Example 2 0.0550 2 no cure (green)
  • Neoprene rubber Stock-to- 0.3231 Control) 2 cured Stock
  • Neoprene rubber Solvent 0.0184 Compar- 2 cured Adhesive ative
  • Example 17 Neoprene rubber Example 1 0.2367 2 cured
  • Example 18 Neoprene rubber Example 2 0.3520 2 cured
  • the backing pad was secured to the green rubber neoprene stock using superglue (cyanoacrylate).
  • superglue cyanoacrylate
  • the backing pad was cured onto the rubber stock without superglue.
  • Examples 3-10 the green rubber stock and the backing pad were weighed before any adhesive was applied.
  • a foam/sponge brush was used to apply the adhesive in a thin, uniform layer onto each face of the adhesion pad. It was observed that all of the adhesives coated and wetted the rubber well.
  • the pads were weighed again after the adhesive had been applied and dried at room temperature for at least an hour in order to get the weight of the adhesive. The weights of adhesive in each Example were approximately the same.
  • Examples 7-10 after the pads were assembled, the samples were cured at 171° C. for 11.5-min.
  • Examples 3-10 A standard procedure for 180° peel testing on an Instron 4501 was used for all of the Examples 3-10. These Examples were peel tested at a rate of 2 in/min and the gap distance was 127 mm. The cured Examples 15-18 were aged for 5 days before testing. This same test was performed for both uncured (Examples 3-6, 11-14) and cured adhesion (Examples 7-10, 15-18).
  • Table 2 and 3 show the uncured tack comparison and the cured adhesive strength comparison.
  • the Example 1 and 2 adhesive formulations demonstrate versatility on different types of air spring rubber, and in either the uncured or cured state.
  • the water-based adhesives of Examples 1 and 2 reduce the VOC emissions released upon drying in comparison to a traditional solvent-based adhesive.
  • the Example 19 adhesive was prepared by sequentially mixing the components listed in Table 4 and allowing them to slowly rotate in a closed vessel for at least 24 hours to ensure mixing and good dispersion.
  • the final adhesive had a solids content in the range of 35-65% and a pH in the range of 9-12.
  • Examples 20-25 were performed to test the tackiness and the strength/durability of the Example 19 adhesive in comparison to other adhesives and against a stock to stock control when applied to a typical styrene-butadiene and natural rubber blend tire compound that also included carbon and silica, sulfur, and accelerators.
  • Examples 20-22 were prepared to measure the uncured (green) peel strength, which primarily shows the tackiness of the joint. This indicates an initial adhesiveness to hold a joint together temporarily until it can cure.
  • Examples 23-25 were prepared to measure the cured peel strength, which shows the strength and durability of the final cured joint.
  • the application of the adhesive onto the green SBR/NR stock was done with a foam/sponge brush, in order to get a thin uniform layer of application.
  • the adhesive was allowed to dry at room temperature for one hour before the uncured samples were tested, and before the cured samples were cured by heating at 171° C. for 15 min. The amount of adhesive was approximately equal in all Examples.
  • Example 20 no adhesive was applied.
  • Example 20 two uncured SBR/NR stocks were applied together in an uncured state, in Example 23 the stocks were applied together uncured and then cured.
  • Examples 21 and 24 were SBR/NR strips joined with a hexane solvent-based adhesive made from natural rubber and styrene-butadiene rubber.
  • Examples 22 and 25 employed the adhesive made in Example 19.
  • Table 5 also shows the uncured tack comparison of Examples 20-22 and the cured adhesive strength comparison of Examples 23-25.
  • the Example 19 adhesive formulation tested in Examples 22 and 25 demonstrates excellent performance on SBR/NR in either the cured or uncured state.
  • the water-based adhesive of Example 19 reduces the VOC emissions released upon drying in comparison to the traditional solvent-based adhesive.
  • Prospective example adhesives incorporating guayule resin may be prepared by sequentially mixing the components listed in Table 6 and allowing them to slowly rotate in a closed vessel to ensure mixing and good dispersion.
  • guayule resin may be incorporated as the penetrant.
  • guayule rubber latex may be used as the latex component of the adhesive.
  • guayule latex may be used that includes both the guayule rubber and guayule resin.
  • the final products in each of Prospective Examples 26-28 would be expected to have a solids content in the range of 35-65% and a pH in the range of 9-12.
  • the adhesives in Examples 29 and 30 were prepared by sequentially mixing the components listed in Table 7 and allowing them to slowly rotate in a closed vessel to ensure mixing and good dispersion.
  • the final adhesives had a solids content in the range of 50-60% and a pH in the range of 9.5-11.5.
  • the guayule latex used in Example 30 was in a purified form that included only guayule rubber with little or no guayule resin present.
  • Example 31 is a comparative example of a solvent based adhesive.
  • a comparison of cured and uncured peel strengths is provided below in Table 8. The peel tests were conducted by applying the adhesives onto uncured (green) and cured styrene-butadiene rubber stock at approximately equal thicknesses. The adhesive was allowed to dry at room temperature for one hour before the uncured samples were tested. The cured samples were prepared by heating the green stocks with the adhesive applied on them at 171° C. for 15 min

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  • Inorganic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
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US11407926B2 (en) 2011-12-07 2022-08-09 Bridgestone Corporation Water-based adhesives
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JP6126120B2 (ja) 2017-05-10
CN104080876A (zh) 2014-10-01
CN104080876B (zh) 2016-09-21
EP2788444A1 (en) 2014-10-15
US20200248045A1 (en) 2020-08-06
EP2788444B1 (en) 2016-09-28
WO2013086407A1 (en) 2013-06-13
JP2015507030A (ja) 2015-03-05
EP2788444A4 (en) 2015-08-05

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