WO2002076726A1 - Gaine pour harnais de cables - Google Patents

Gaine pour harnais de cables Download PDF

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Publication number
WO2002076726A1
WO2002076726A1 PCT/US2001/009206 US0109206W WO02076726A1 WO 2002076726 A1 WO2002076726 A1 WO 2002076726A1 US 0109206 W US0109206 W US 0109206W WO 02076726 A1 WO02076726 A1 WO 02076726A1
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WO
WIPO (PCT)
Prior art keywords
ethylene
backing
wiring harness
density polyethylene
rubber
Prior art date
Application number
PCT/US2001/009206
Other languages
English (en)
Inventor
Daniel Poisson
Scott Barnes
Elwyn Huddleston
Original Assignee
Scapa Tapes North America Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Scapa Tapes North America Inc. filed Critical Scapa Tapes North America Inc.
Priority to PCT/US2001/009206 priority Critical patent/WO2002076726A1/fr
Publication of WO2002076726A1 publication Critical patent/WO2002076726A1/fr

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Classifications

    • 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
    • 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
    • B32B25/08—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 synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/0207—Wire harnesses
    • 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
    • C08L23/06—Polyethene
    • 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
    • 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
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/206—Insulating
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/718—Weight, e.g. weight per square meter
    • 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
    • B32B2319/00—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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/046—LDPE, i.e. low density polyethylene
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/22—Halogen free composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
    • 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 other atoms than carbon or hydrogen atoms
    • C08L23/0853—Vinylacetate
    • 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 other atoms than carbon or hydrogen atoms
    • C08L23/0869—Acids or derivatives thereof
    • 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
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/302—Applications of adhesives in processes or use of adhesives in the form of films or foils for bundling cables
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
    • 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
    • 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
    • C09J2423/006—Presence of polyolefin 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
    • C09J2431/00—Presence of polyvinyl acetate
    • C09J2431/006—Presence of polyvinyl acetate 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
    • C09J2433/00—Presence of (meth)acrylic polymer
    • C09J2433/006—Presence of (meth)acrylic polymer in the substrate

Definitions

  • the present invention relates to adhesive tape for harness wraps for a wiring system of a motor vehicle. More specifically, the present invention relates to a recyclable, halogen-free polymer film tape harness wrap, and to a method for making the harness wrap.
  • Wiring systems within an automobile play a vital role in the proper operation of a motor vehicle over its service life. These wiring systems are designed, manufactured, specific to each model type, and supplied in a modular form (harnesses) to an automobile plant. Each harness segment is wrapped with a continuous layer of tape which may or may not have an adhesive coating on one side, to help contain and protect the individual coated wires in the harness assembly. Performance criteria will vary depending on the location of the harness within the automobile. Engine compartments offer the most severe conditions including extreme temperature ranges and exposure to fluids, e.g., gasoline, oil, transmission fluid, brake fluid and radiator coolant.
  • fluids e.g., gasoline, oil, transmission fluid, brake fluid and radiator coolant.
  • Passenger compartments are relatively friendly to materials but a need exists for low fogging (the out-gassing of a vapor that can deposit a film on window surfaces), along with a good level of noise suppression.
  • the tape In all areas of use, the tape must provide resistance to damage (primarily physical), resist flagging and be economically attractive.
  • PVC tapes are by far the most common material for wrapping and securing wires in automotive harness assemblies.
  • PNC tapes are produced through the solution coating of adhesive on to a calendered PNC sheet. It is a multiple stage process first requiring the production of a PVC sheet in roll form. The film is then coated with adhesive, dried and wound into logs. Logs are then cured at elevated temperatures, e.g., 90°C, to cross-link the adhesive. Cross-linking is essential when monomeric plasticizers are used in the sheet in order to prevent the damaging effects of plasticizer migration.
  • PVC tapes Characteristic benefits of PVC tapes can be summarized as follows: conformable, inherently flame retardant, good resistance to fluid damage, and economical.
  • PVC tapes have disadvantages in that they have generally poor fogging properties due to plasticizer out-gassing, are not recyclable, and contain halogens which give off highly toxic gases when burned.
  • Non-PVC tapes may also contain undesirable halogens and are, therefore, also not recyclable.
  • U.S. Patent No. 5,407,726 assigned to The Kendall Company describes conformable high temperature resistant tapes comprising a chlorinated polymeric backing having a pressure sensitive adhesive layer disposed on one side of the backing. The chlorinated polymeric backing renders the tape non-recyclable and adds hazards to the environment upon degradation. Cloth tape is also widely used, particularly in the passenger compartment and instrument panel areas where noise due to harness rattle is a concern. Woven print cloth is typically coated directly with adhesive. Beneficial characteristics of cloth tapes are: conformability, good resistance to abrasion and good noise suppression. However, cloth tapes have disadvantages in that they have poor fluid resistance and are relatively expensive. For example, U.S.
  • Patent No. 5,804,510 assigned to Beiersdorf Aktiengesellschaft discloses a halogen- and antimony-free fabric adhesive tape for wrapping cable harnesses which has a permeable fabric base, a polar self- adhesive composition and a flameproofing agent in both the base and adhesive.
  • Polymer coated scrim tapes are somewhat of a hybrid offering a combination of features found in both PVC and cloth tapes.
  • the backing is comprised of a scrim (gauze) cloth or other woven /nonwoven cloth, coated with an extruded layer of polymer.
  • a tie coat between the film backing and the cloth is required and critical.
  • Beneficial characteristics of scrim tapes are conformable, good resistance to fluid damage, good abrasion resistance, puncture resistance, and low cost.
  • scrim tapes if they are flame resistant types, typically contain halogens and are not recyclable.
  • a tie coat may also be used in the tapes of the 773 patent, and halogens may also be present.
  • Another example is described in U.S. Patent No.
  • 4,992,331 ('331), also assigned to The Kendall Company, which teaches a flame-retardant conformable adhesive tape useful as a wire harness having a water-impermeable chlorinated polyethylene backing layer (about 1 to 3 mils thick), a fiber cloth/scrim, a flame retardant adhesive layer (preferably rubber-based), and a thin tie coat layer between the backing and the scrim.
  • the tapes of the '331 patent have the disadvantage of containing the halogen chlorine which, as mentioned previously, is environmentally harmful and not recyclable.
  • the present invention offers advantages and alternatives over the prior art by providing a recyclable, halogen-free wiring harness wrap for a wiring system of a motor vehicle.
  • the harness wrap of the present invention offers many of the benefits of plasticized PVC but addresses the need for a low cost, low fog, halogen-free and recyclable alternative.
  • the wrap comprises a halogen-free copolymer backing layer with a rubber-based adhesive layer disposed on a surface of the backing layer.
  • the process of manufacturing the wiring harness wrap of the present invention includes a single production step for forming the backing film and applying the adhesive to the film.
  • the preferred method to make the present invention involves a tape calendering procedure.
  • Tape calendering procedures provide in-situ film formation and solvent free adhesive application.
  • the regular and widespread process of PVC tape production is to use a pre-formed film and spread an adhesive solution on it.
  • the tape is then dried in an oven before converting.
  • the present method consumes less energy and is environmentally friendly.
  • the formation of the tape backing directly on the calender roll is more economical then outsourcing the film.
  • the compounding of the backing film right on line allows the manufacturer to be flexible and in control. Flexibility is in the dimensional characteristics of the film (thickness) and properties (softness). Tensile and elongation of the film can be adjusted to suit the application.
  • the use of a hot-melt type of adhesive eliminates the use of expensive and volatile solvents. Risks of explosions or atmosphere contamination are avoided. Thick coating, if needed, can be more easily achieved.
  • the harness wrap comprises low density polyethylene (LDPE) and ethylene-methyl acrylate (EMA) copolymer containing about 21.5% methyl acrylate.
  • LDPE low density polyethylene
  • EMA ethylene-methyl acrylate copolymer containing about 21.5% methyl acrylate.
  • the copolymer films of the present invention offer many benefits in a harness wrap application because they are halogen-free, recyclable, inherently low-fogging, conformable, light weight, of relatively low cost and have good physical properties, e.g. degradation resistant, abrasion and puncture resistant, and good electrical insulation properties.
  • the harness wrap of the present invention further comprises an adhesive layer formed on the copolymer film backing.
  • the adhesion of the tape to itself (as a self-wound product) must also be balanced. If the roll is too easy to unwind, the application will suffer from lack of proper tensioning during wrapping. If the roll is too difficult to unwind, the end-user will experience finger and wrist strain over the repetitive application of the tape. In addition, the tape roll must unwind smoothly and without excessive noise or chattering. PVC tapes have highly plasticized backing and lead readily to a smooth unwind. To obtain the same effect is a challenge with polyethylene based tapes.
  • the advantage of the present adhesive formulation is to offer a well balanced set of properties such as tack, adhesion and unwind characteristics.
  • Such an adhesive layer may be based on synthetic rubbers such as styrenic block copolymers (SBC) or natural rubbers.
  • SBC styrenic block copolymers
  • a tie coat is not required to achieve proper anchorage of the adhesive to the film, and the resulting tape product features a soft, flexible film with good adhesion and a smooth unwind.
  • An object of the present invention is to provide a harness wrap which is environmental friendly. By eliminating halogens, the harness wrap eliminates a major source of pollution when incinerated during recycling.
  • PVC can emit noxious and toxic gases such as hydrogen chloride HCl and phosgene COCl 2 . This is caused by the presence of chlorine on the polymer backbone. In contrast, the combustion of ethylene based polymers will evolve only harmless carbon dioxide and water vapor.
  • the instant invention can be made fire retardant by addition of known non-halogen organic chemicals such as phosphorus based or boron based systems.
  • non-halogen organic chemicals such as phosphorus based or boron based systems.
  • Inorganic chemicals such as magnesium hydroxide or alumina trihydrate are also used and known to those skilled to the art.
  • Another object of the invention is the elimination of a tie coat.
  • the present invention does not utilize a tie coat which results in fewer steps to make the product.
  • Yet another object of the invention is to provide a low fog alternative to plasticized PVC.
  • the harness wrap eliminates the disadvantage of fogging found in PVC -based alternatives.
  • Figure 1 is a schematic representation of a three-roll vertical calender apparatus used to make the wiring harness wrap of the present invention.
  • the present invention is a wiring harness wrap for use in an automobile.
  • the harness wrap has a halogen-free backing with a rubber-based adhesive disposed on one side thereof.
  • the backing is composed of a low- density polyethylene (LDPE) with a soft copolymer or equivalent, such as ethylene-methyl acrylate (EM A).
  • LDPE low- density polyethylene
  • EM A ethylene-methyl acrylate
  • the adhesive may be a synthetic or a natural rubber-based adhesive.
  • the components of the backing are expressed in percentages while the components of the rubber-based adhesive portion are expressed in parts per hundred rubber (phr).
  • a typical backing film formulation of the present invention comprises about 65% low-density polyethylene polymer (LDPE), and about 30% of a second polymer such as an ethylene-acrylic copolymer, an ethylene-acetate copolymer, an ethylene-acrylic-acid copolymer, or an elastomer. Additives such as carbon black, antioxidant, and stabilizers (if desired) may also be present. In the production of such backing films, a thickness of from about 3 to about 6 mils is desirable.
  • LDPE low-density polyethylene polymer
  • Additives such as carbon black, antioxidant, and stabilizers (if desired) may also be present.
  • a thickness of from about 3 to about 6 mils is desirable.
  • a preferred LDPE is an extrusion grade resin such as LE0220 available from Nova Chemicals Corp. (Calgary AL, Canada). It is clear, however, that a wide range of LDPE resins may be used. It is recognized that regardless of the LDPE used, the melt flow index should be between 2 and 15. For example, a series of high melt index (12-13) coating resins from CHEVRONTM such as CHEVRONTM PE1013 or CHEVRONTM PE1018 process well and are also of interest. The LDPE content ranges from about 30% to about 95%, preferably from about 45% to about 85%, and most preferably from about 60% to about 70%.
  • Copolymers which may be used with the LDPE are selected from the group consisting of ethylene-acrylic copolymers, ethylene-acetate copolymers, and ethylene acrylic-acid copolymers.
  • the acetate-based copolymers include ethylene- vinyl acetate (EVA).
  • Ethylene-acrylic copolymers include ethylene- methyl acrylate (EM A), ethylene-ethyl acrylate (EEA), ethylene-acrylic elastomer, and ethylene-acrylic acid (EAA).
  • EAA ethylene-acrylic acid
  • EMA is the most preferred copolymer and is quite compatible with the adhesive.
  • Preferred grades include CHEVRONTM SP-2205 available from Eastman Chemicals Company (Kingsport TN) and OPTEMATM TC- 110 available from Exxon Chemical Company (Houston TX). It is also possible to replace the copolymer with an elastomer. Suitable elastomers include natural rubber, ethylene propylene rubbers (EPR), diene terpolymers, butyl rubber, and styrene-butadiene-styrene (SBS). Polymers and copolymers miscible with LDPE or which can form interpenetrating networks with LDPE may be used.
  • EPR ethylene propylene rubbers
  • SBS styrene-butadiene-styrene
  • the preferred EMA copolymer has a methyl acrylate content of about 20% to about 22%.
  • OPTEMATM TC-110 has about 21.5% methyl acrylate content.
  • EMA copolymers with a higher content of methyl acrylate can be used if the overall content of methyl acrylate of the backing is maintained. It has been found that a range of from about 5% to about 60%, preferably from about 5% to about 45%, with about 30% being the most preferred (about 6% total methyl acrylate).
  • the level of methyl acrylate in the total formula is the controlling factor and as a result, other grades of EMA could potentially be used.
  • carbon black masterbatches containing about 50% carbon black may be used.
  • About 4% of the masterbatch is preferably used in the backing of the present invention.
  • Black pigment masterbatches in polyethylene can be obtained from many suitable sources.
  • the amount of the carbon black masterbatch used ranges from about 1% to about 5%, most preferably from about 1.5% to about 5%, and optimally from about 2% to about 4%.
  • Antioxidant systems typically employed for polyethylene are used in normal amounts.
  • a masterbatch containing 1% of SANTONOXTM (Monsanto, Saint-Louis MO) in polyethylene is used.
  • About 1% of this masterbatch is preferably used.
  • antioxidants may be used such as IRGANOXTM B215 (Ciba Specialty Chemicals, Mississauga, Ontario, Canada).
  • the preferred content of antioxidant concentrate ranges from about 0.5% to about 3%, preferably from about 0.5% to about 2%, and optimally from about 0.5% to about 1.5%.
  • the adhesive which is applied to the backing film may be prepared in a number of known ways. Once the adhesive is formulated, it is applied to the backing film using a calendering method discussed hereinafter.
  • the preferred adhesive thickness is about 1.5 to about 4 mils.
  • Suitable adhesives include natural rubber, thermoplastic rubber and elastomeric polymer rubber. These rubbers include, but are not be limited to, natural rubber, block copolymers (SIS, SBS and SEBS), butyl rubbers, and ethylene-propylene rubbers (EPR). Naturally, blends of two or more of these polymers can be beneficial and highly desirable in achieving the necessary performance. In addition, cross-linking may be employed to further enhance the performance of these systems. Regardless of the polymer system used, all adhesives contain additional materials including tackifiers, fillers, plasticizers and stabilizers.
  • a preferred composition of the adhesive is a mixture of about 85 % of the styrene-isoprene block copolymer VECTORTM 4113 available from Dexco Polymers (Houston TX), about 15 % of the styrene-isoprene block copolymer VECTORTM 4114 also available from Dexco Polymers, about 9 phr of the liquid petroleum hydrocarbon resin ADTACTM LV available from Hercules Canada (Mississauga, Ontario, Canada), about 45 phr of the tackifying resin ESCOREZTM 1310 available from Exxon Chemical Company (Houston, TX), about 25 phr of the mineral oil PARAFLEXTM HT 68 available from Petro-Canada (Calgary, Alberta, Canada), and about 1 phr of the IRGANOXTM B-215 available from Ciba Specialty Chemicals (Mississauga, Ontario, Canada).
  • the base elastomer for the adhesive is a polystyrene-polyisoprene- polystyrene polymer, SIS.
  • the preferred SIS is VECTORTM from Dexco Polymers.
  • VECTORTM 4113 and 4114 are styrene-isoprene-styrene block copolymers, and both have a styrene content of about 15% and a specific gravity of about 0.92.
  • VECTORTM 4113 has a diblock content of about 18% while VECTORTM has a diblock content of about 42%.
  • the high diblock content is considered beneficial to tack and unwind characteristics of the tape.
  • Other SIS such as KRATONTM D1107P polymer from Shell Chemical (Houston, TX) can be used.
  • SIS block copolymer having a diblock content of about 18% and from about 1% to about 50% of SIS having a diblock content of about 42%. It is preferred that the styrene- isoprene-styrene block copolymer has from about 70% to about 95% of SIS block copolymer having a diblock content of about 18% and from about 5% to about 30% of SIS having a diblock content of about 42%. It is most preferred that the block copolymer content is from about 80 to about 90% of SIS block copolymer having a diblock content of about 18% and from about 5% to about 20% SIS having a diblock content of about 42%.
  • tackifying additive employed depends essentially upon the level of tack desired. It will be understood that the specific tackifying additives which can be combined and the amount of each tackifying additive which can be employed to achieve the desired level of tack can be readily determined by those skilled in the art using reasonable and routine experimentation.
  • Particularly useful tackifying resin additives used to practice this invention include low molecular weight petroleum-derived hydrocarbon resins commercially available from Exxon Chemical Company under the registered trademark ESCOREZTM. Suitable tackifying resin additives include ESCOREZTM 1304, ESCOREZTM 1310, and ESCOREZTM 1315.
  • These resins are characterized as being thermoplastic, aliphatic hydrocarbons having softening points of about 85°C to about 125°C, and weight average molecular weights ranging from about 360 to about 2570.
  • the content of the petroleum hydrocarbon tackifying resin additive ranges from about 1 phr to about 85 phr, preferably from about 10 phr to about 60 phr, and most preferably from about 35 phr to about 55 phr.
  • ADTACTM LV is the preferred liquid petroleum hydrocarbon resin.
  • Other particularly useful aliphatic hydrocarbon resins are the highly viscous liquid petroleum-derived resins available under the trademark WINGTACKTM 10 from Goodyear Chemical (Beaumont, TX). Such a resin has a softening point of about 10°C, a molecular weight of about 660 and a specific gravity of about 0.90 at 25°C. This resin serves as a processing aid as well as to impart additional tack to the surface of the calendered adhesive. It is considered to have a favorable effect on the smoothness of the unwind of the finished tape.
  • the content of the viscous liquid petroleum-derived resin ranges from about 1 phr to about 25 phr, preferably from about 5 phr to about 20 phr, and most preferably from about 5 phr to about 15 phr.
  • the quantity of the mineral oil ranges from about 1 phr to about 50 phr, preferably from about 5 phr to about 45 phr, and most preferably from about 15 to about 35 phr.
  • PARAFLEXTM HT 68 may be substituted for KAYDOLTM USP, which is a white mineral oil available from Daminco Inc. (Oakville ON, Canada). Both of these products are 100% pure mineral oil.
  • IRGANOXTM B215 is a preferred antioxidant which is a 2:1 blend of IRGAFOSTM 168 and IRGANOXTM 1010.
  • the amount of antioxidant used ranges from about 0.5 phr to about 5 phr, preferably from about 0.5 phr to about 3 phr, and most preferably from about 0.5 phr to about 1.5 phr.
  • ingredients may also be included in the adhesive composition.
  • additional conventional rubber compounding additives such as fillers, pigments, antiozonants, flame retardants and the like may be included in conventional amounts.
  • the adhesive composition can be initially admixed by conventional means using conventional rubber compounding equipment such as a Banbury mixer, a Sigma-blade mixer, a two-roll mill, an extruder and /or any other mixers and the like which are suitable for compounding the ingredients of the composition.
  • the ingredients are admixed at temperatures ranging from about 50°C to about 150°C.
  • a Sigma-blade mixer is used at a temperature of about 150°C.
  • the tape calendering process used to produce the harness wrap of the present invention employs a three-roll vertical calender 10, as shown in Figure 1.
  • the initial step for making the present invention involves blending from about 30% to about 95% of a low density polyethylene, and from about 5% to about 60% of a second polymer selected from the group consisting of ethylene- acrylic copolymers, ethylene-acetate copolymers, ethylene-acrylic acid copolymers and elastomers to form a molten LDPE composition.
  • the molten LDPE composition is extruded at about 345°F (174°C) to a first nip 11 between the top roll 12 and the center roll 14 by a single-screw extruder.
  • the top roll 12 maintains a temperature of about 380°F (193°C)
  • the center roll 14 maintains a temperature of about 180°F (82°C).
  • a backing sheet 18 is then formed from the LDPE composition on the center roll 14.
  • the thickness of the backing 18 is controlled by the gap between the top and center roll 12 and 14.
  • the backing 18 is then coated with an adhesive layer.
  • the molten adhesive is extruded at about 290°F (143°C) and fed to the nip 13 between the center roll 14 and the bottom roll 16 by single- screw extrusion.
  • the bottom roll 16 maintains a temperature of about 310°F (154°C).
  • the thickness of the tape adhesive is therefore controlled by the gap between the center and the bottom roll 14 and 16.
  • the calendered adhesive tape 20 is then cooled by means of cooling cans.
  • the tape is then wound up and ready for converting. While the overall web speed is about 80 feet per minute (fpm), the top roll moves at about 0.5 fpm, the center roll moves at about 80 fpm, and the bottom roll moves at about 4.0 fpm.
  • thermoplastic rubber adhesive having 85 % of a polyisoprene midblock with polystyrene endb locks SIS block copolymer having a diblock content of about 18% (VECTORTM 4113), 15 % of a polyisoprene midblock with polystyrene endblocks SIS having a diblock content of about 42% (VECTORTM 4114), 45 phr of a tackifying resin (ESCOREZTM 1310), 9 phr of a liquid resin (ADTACTM LV), 25 phr of mineral oil (PARAFLEXTM HT 68), and 1 phr of an antioxidant (IRGANOXTM B215) was coated onto the backing sheet.
  • the overall thickness of the test sample was 6.0 mils with a backing thickness of 4.1 mils.
  • the tensile strength was 15 lbs /in with an 85% elongation.
  • Adhesion properties are 16 oz/inch adhesion to steel and 9 oz/inch adhesion to the backing. Subjectively, the test sample was found to have very good tack.
  • the present invention is designed to produce an adhesive tape for harness wraps which meets or exceeds Automotive Engineering Specification Ford Part. No. ES-XU5T-1A303-AA, Type A (temperature rating of 85°C). There is reference to low fogging characteristics, adhesion levels, physical performance, long-term heat aging, cold resistance and so on. While preferred embodiments have been shown and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustration, and is not limited to the embodiments described above but encompasses any and all embodiments within the scope of the following claims.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

La gaine pour harnais de câbles de l'invention présente un support (18) qui contient environ 30 à 95 % d'un polyéthylène basse densité; environ 5 à 60 % d'un second polymère, tel que des copolymères d'éthylène et d'acrylique, des copolymères d'éthylène et d'acétate, des copolymères d'éthylène et d'acide acrylique, et des élastomères; et un adhésif à base de caoutchouc sur une face du support.
PCT/US2001/009206 2001-03-23 2001-03-23 Gaine pour harnais de cables WO2002076726A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2001/009206 WO2002076726A1 (fr) 2001-03-23 2001-03-23 Gaine pour harnais de cables

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2001/009206 WO2002076726A1 (fr) 2001-03-23 2001-03-23 Gaine pour harnais de cables

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Publication Number Publication Date
WO2002076726A1 true WO2002076726A1 (fr) 2002-10-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7154038B2 (en) * 2002-05-15 2006-12-26 Studer Draht - Und Kabelwerk Ag String-shaped product with connecting and/or fixing means
WO2017025267A1 (fr) * 2015-08-13 2017-02-16 Certoplast Technische Klebebänder Gmbh Ruban adhésif à faibles émanations gazeuses, destiné à envelopper des objets allongés
WO2018221251A1 (fr) * 2017-05-30 2018-12-06 Henkel Ag & Co. Kgaa Agent adhésif thermofusible durcissable sous l'effet de l'humidité

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5681654A (en) * 1995-12-04 1997-10-28 The Kendall Company Low-fogging pressure-sensitive adhesive

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5681654A (en) * 1995-12-04 1997-10-28 The Kendall Company Low-fogging pressure-sensitive adhesive

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7154038B2 (en) * 2002-05-15 2006-12-26 Studer Draht - Und Kabelwerk Ag String-shaped product with connecting and/or fixing means
WO2017025267A1 (fr) * 2015-08-13 2017-02-16 Certoplast Technische Klebebänder Gmbh Ruban adhésif à faibles émanations gazeuses, destiné à envelopper des objets allongés
CN107922799A (zh) * 2015-08-13 2018-04-17 塞托普拉特胶带技术有限公司 用于捆装长型物体的低起雾胶带
WO2018221251A1 (fr) * 2017-05-30 2018-12-06 Henkel Ag & Co. Kgaa Agent adhésif thermofusible durcissable sous l'effet de l'humidité

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