Classifications

• • 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
  • C09J113/00—Adhesives based on rubbers containing carboxyl groups
  • C09J113/02—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
  • 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
  • C09J115/00—Adhesives based on rubber derivatives
• • 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
  • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
  • C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
  • C08C19/00—Chemical modification of rubber
  • C08C19/02—Hydrogenation
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L15/00—Compositions of rubber derivatives
• • 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
  • C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
  • C08L23/32—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with compounds containing phosphorus or sulfur
  • C08L23/34—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with compounds containing phosphorus or sulfur by chlorosulfonation
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
  • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
  • C08L2666/04—Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
  • C08L2666/08—Homopolymers or copolymers according to C08L7/00 - C08L21/00; Derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
  • C08L9/02—Copolymers with acrylonitrile
  • C08L9/04—Latex
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
  • C08L9/06—Copolymers with styrene
  • C08L9/08—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
  • C09J2400/00—Presence of inorganic and organic materials
  • C09J2400/20—Presence of organic materials
  • C09J2400/26—Presence of textile or fabric
  • C09J2400/263—Presence of textile or fabric in the substrate
• • 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
  • C09J2409/00—Presence of diene rubber
• • 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
  • C09J2421/00—Presence of unspecified rubber
  • C09J2421/006—Presence of unspecified rubber in the substrate
• • 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
  • C09J2423/00—Presence of polyolefin

Definitions

• the present invention relates to the bonding of textile reinforcements to high temperature resistant rubber and, more particularly, this invention relates to an improved adhesive composition for adhering such textile reinforcements to EPDM (Ethylene-Propylene- Diene rubber) for use in reinforced rubber based products such as high temperature resistant power transmission belts.
• EPDM Ethylene-Propylene- Diene rubber
• U.S. Patent No. 3,325,333 to Kigane et al. teaches a method of adhering a polyester cord to a CSM rubber compound by treating the cord with an aqueous adhesive composition containing methylolated blocked organic polyisocyanate and a vulcanizable organic polymer at conventional or normal polyester treating temperatures.
• U.S. Patent No. 3,060,078 to Atwell teaches a method of bonding polyester cord fibers to a CSM rubber compound by treating the cord with a resorcinol-formaldehyde neoprene latex adhesive composition
• the RFL dip is prepared by mixing an RFL prepolymer with a latex.
• the RFL prepolymer provides adhesion to the reinforcing material and the latex provides adhesion to the rubber.
• the cord is usually pre-treated with a composition which improves its reactivity.
• Compositions that have been used for this purpose include epoxy resins and isocyanates.
• belts are prepared by bonding a double-twisted cord to the rubber. The cord is immersed in a RFL dip and transported through a vertical oven where it is heated under tension for a predetermined period of time. This causes the cord to elongate and restructure the polyester.
• Prior art methods of adhering polyester cord for example, to rubbers such as chlorosulfonated polyethylene (CSM) have included the use of neoprene latex and vinyl pyridene latex in the RFL latex dip.
• CSM chlorosulfonated polyethylene
• polyester cord receives an initial polyphenylisocyanate treatment at 8 to 15 pounds of tension which is beat activated at a temperature in the range of 300° F to 425° F for 120 seconds to react the functional groups of the polyphenylisocyanate with the open bond sites in the cord.
• a RFL adhesive is coated over the reacted polyphenylisocyanate and dried, preferably in an oven, for 120 seconds at a temperature in the range of 180° F to 275° F to evaporate the water from the RFL and to keep the RFL from blistering prior to the heat setting of the cord.
• the present invention relates to an adhesive composition which, when applied to a textile reinforcement using conventional methods in an environmentally safe manner, provides effective adhesion of the textile reinforcement to a rubber compound, and more particularly EPDM, and also relates to a method for adhering such textiles to rubber compounds.
• the adhesive composition may also utilize a combination of any of the latices listed above, and may further contain latex blends with one or more latices of the following: SBR (styrene butadiene), nitrile, vinyl pyridine, natural rubber, acrylonitrile, EVA, PVA; polyester such as ethylene vinyl acetate (EVA), poiyvinyl acetate (PVA), etc; polyurethane, PVC, polychloroprene , acrylic acid, methacrylic acid, vinylidine chloride, butyl, and copolymers and terpolymers thereof.
• SBR styrene butadiene
• EVA ethylene vinyl acetate
• PVA poiyvinyl acetate
• polyurethane PVC, polychloroprene , acrylic acid, methacrylic acid, vinylidine chloride, butyl, and copolymers and terpolymers thereof.
• HSBR latex hydrogenated styrene-butadiene rubber
• HNBR hydrogenated nitrile-butadiene rubber
• XHNBR carboxylated hydrogenated nitrile- butadiene rubber
• EPDM ethylene-propylene-diene or blends thereof
• an aqueous solution of maleinized liquid polybutadiene drying the adhesive; incorporating the cord into the rubber compound; and curing the cord and rubber compound to produce power transmission belts.
• the adhesive used in the present invention comprises (a) a latex such as hydrogenated styrene-butadiene rubber (HSBR), hydrogenated nitrile-butadiene rubber (EPDM), chlorosulfonated polyethylene (CMS), carboxylated chlorosulfonated polyethylene (ACSM) and the like, blended with (b) an aqueous solution of malienized liquid polybutadiene.
• a latex such as hydrogenated styrene-butadiene rubber (HSBR), hydrogenated nitrile-butadiene rubber (EPDM), chlorosulfonated polyethylene (CMS), carboxylated chlorosulfonated polyethylene (ACSM) and the like, blended with (b) an aqueous solution of malienized liquid polybutadiene.
• the adhesive composition may contain a combination of the above noted latices and may also contain latex blends of one or more styrene-butadiene rubber (SBR), nitrile rubber, vinyl pyridine, natural rubber, acrylonitrile, ethylene-vinyl acetate (EVA), polyvinyl acetate (PVA), polyester, polyurethane, polyvinyl chloride (PVC), polychloroprene, acrylic acid, methacrylic acid, vinylidene chloride, butyl rubber, and copolymers, terpolymers and mixtures thereof. It has been found that the present combination of ingredients results in an improved adhesive composition that provides excellent adhesion of textiles to EDPM rubber compounds.
• SBR styrene-butadiene rubber
• EVA ethylene-vinyl acetate
• PVA polyvinyl acetate
• polyester polyurethane
• PVC polyvinyl chloride
• PVC polychloroprene
• acrylic acid
• the latex used in the present invention is hydrogenerated styrene-butadiene rubber (HNBR), carboxylated hydrogenated nitrile-butadiene rubber (XHNBR), or chlorosulfonated polyethylene (CSM) having a solids content of about 25 to 50%. Most preferably, the latex has a solids content of about 32 to 45%.
• the latex content of the adhesive is preferably about 50 to 90 percent by weight and preferably about 65 to 90 percent by weight.
• the resin utilized in the present invention is typically an aqueous maleinized polybutadiene; more specifically it is an ammonia neutralized isobutyl half-ester of maleinized liquid polybutadiene.
• the malienized liquid polybutadiene is prepared by reacting about 5 to 25 parts of maleic anhydride with 100 parts of liquid polybutadiene (Lithene).
• the amount of malienized liquid polybutadiene utilized in the adhesive composition of the present invention ranges from about 1 to 50%, preferably about 10 to 30% by weight.
• the concentration of the maleinized liquid polybutadiene in the aqueous solution as defined in the present invention is the concentration of the "half-ester" which typically is present in amounts of about 15 to 30% by weight and preferably about 19 to 25% by weight.
• the malienized liquid polybutadiene is defined as an aqueous solution of malienized liquid polybutadiene although it typically is not a true solution until after hydrolysis and neutralization to the isobutyl half ester.
• Water preferably de-ionized water, is utilized in combination with the essential components of the present invention in order to provide an adhesive composition having a final solids content of about 5 to 40 percent, preferably about 15 to 30 percent.
• the adhesive composition of the present invention may further contain up to about 10% by weight carbon black dispersion. While the solids content of the carbon black dispersion is not believed to be critical, the solids content is typically about 30 to 50% and even more typically about 35 to 40% carbon black in water.
• the latex of the present invention may be further blended with up to a major amount of one or more additional latices of the following rubbers: styrene-butadiene, nitrile, vinyl pyridine, natural rubber, acrylonitrile, ethylene-vinyl acetate, polyvinyl alcohol, polyurethane, polyvinyl chloride, polychloroprene, acrylic acid, methacrylic acid, vinylidine chloride, butyl, and copolymers and terpolymers thereof.
• additional latices of the following rubbers: styrene-butadiene, nitrile, vinyl pyridine, natural rubber, acrylonitrile, ethylene-vinyl acetate, polyvinyl alcohol, polyurethane, polyvinyl chloride, polychloroprene, acrylic acid, methacrylic acid, vinylidine chloride, butyl, and copolymers and terpolymers thereof.
• additional latices typically, up to about 75% by weight of these additional latices based upon the total weight of latices can be employed.
• the additional latices have a solids content of about 30 to 50%.
• the adhesive is applied to the textile either by dipping, spraying, or brushing, preferably dipping, it is then dried in an oven at a temperature in the range of about 82.2 to 135° C (180° F to 275° F), preferably about 107.2 to 121.1 ° C (225° F to 250° F) for an effective time, typically, about 2 minutes.
• the textile is then heat set in an oven for about 1 to 3 minutes at a temperature in the range of from 148.9 to 232.2° C (300° F to 450° F), preferably 176.7 to 204.4°C (350°F to
• the adhesive composition of the present invention can optionally contain other well known additives including plasticizers, fillers, pigments, thickeners, dispersing and wetting agents, reinforcing agents and the like, in amounts employed by those skilled in the adhesive arts to obtain the desired consistency, appearance, reinforcement, and uniformity of coating on the textile substrate.
• the reinforcing textile of the present invention can be any of the various textiles conventionally employed in forming textile reinforced rubber products, particularly, power transmission belts.
• exemplary textiles include polyamide fiber; meta-and para- aramide fiber; polyester fiber such as PET (polyethylene terephthalate), PVA (polyvinyl alcohol), and the like; PEN (polyethylene naphthalate) fiber, cotton, fiber, carbon fiber, glass fiber, PBO (poly p-phenylene-2,6- bezobisoxazole) fiber, acrylic fiber; rayon fiber; LCP (liquid crystal polymer) fiber; and the like.
• the reinforcing element is a polyester.
• the adhesive-containing reinforcing textile be incorporated into the EPDM rubber compounds as individual cords and then cured in a conventional manner to produce rubber articles such as power transmission belts, more specifically Polyrib belts, synchronous belts, variable speed belts, flat belts, raw edge v-belts, and wrapped V- belts.
• the reinforcement element may also be in the form of an adhesive-containing fiber sheet between two or more layers of the EPDM rubber.
• the adhesive-containing fiber is chopped into short strands and dispersed throughout the rubber article. Any one or a combination of the above may be used to reinforce the rubber article.
• Example 1 A mixture of 70 grams hydrogenated styrene-butadiene rubber latex (32% solids) ( ) , 10 grams carbon black dispersion (37.5% solids) (2) , and 20 grams ammonia-neutralized aqueous solution of isobutyl half-ester of maleinized liquid polybutadiene (21.6% solids) (3) , was diluted to a final solid content of 23% and coated onto an isocyanate pretreated polyester cord by dip application at 4% dip pick up. The treated cord was dried in a 107.2 °C (225° F) oven for 2 minutes and then heat set under 10 lbs. of tension 204.4°C (400°F) for 1 minute.
• Example 2 Example 1 was repeated using 60 grams of the hydrogenated styrene-butadiene rubber, 10 grams of the carbon black d' sp ersion, and 30 grams of the ammonia-neutralized aqueous solution of isobutyl half-ester of maleinized liquid polybutadiene. The results are shown in Table 2.
• Example 3 Example 1 was repeated using 70 grams of hydrogenated nitrile-butadiene rubber latex (45% solids) (4) , 10 grams carbon black dispersion (37.5% solids), and 20 grams ammonia-neutralized aqueous solution of isobutyl half-ester of maleinized liquid polybutadiene (21.6% solids). The results are shown in Table 3.
• Example 4 Example 1 was repeated using 70 grams carboxylated hydrogenated nitrile-butadiene rubber latex (40% solids) (5) , 10 grams carbon black dispersion (37.5% solids), and 20 grams ammonia- neutralized aqueous solution of isobutyl half-ester of maleinized liquid polybutadiene (26.6% solids). The results are shown in Table 4.
• Example 5 Example 1 was repeated using 70 grams chlorosulfonated polyethylene (40% solids) (8) , 10 grams carbon black dispersion (37.5% solids), and 20 grams ammonia-neutralized aqueous solution of isobutyl half-ester of maleinized liquid polybutadiene (21.6% solids). The results are shown in Table 5.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Adhesives Or Adhesive Processes (AREA)

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Cited By (10)

Citations (4)

• 2001
  • 2001-03-16 AU AU2001253866A patent/AU2001253866A1/en not_active Abandoned
  • 2001-03-16 AR ARP010101237A patent/AR028259A1/es not_active Application Discontinuation
  • 2001-03-16 WO PCT/US2001/040327 patent/WO2001068784A1/en active Application Filing

Patent Citations (4)

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