[go: up one dir, main page]

WO2005023950A2 - Adhesif - Google Patents

Adhesif Download PDF

Info

Publication number
WO2005023950A2
WO2005023950A2 PCT/GB2004/003795 GB2004003795W WO2005023950A2 WO 2005023950 A2 WO2005023950 A2 WO 2005023950A2 GB 2004003795 W GB2004003795 W GB 2004003795W WO 2005023950 A2 WO2005023950 A2 WO 2005023950A2
Authority
WO
WIPO (PCT)
Prior art keywords
adhesive
polyalphaolefin
layer
film
grafted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB2004/003795
Other languages
English (en)
Other versions
WO2005023950A3 (fr
Inventor
Anthony Francis Johnson
Sum-Wing Tsui
Stephen Sik-Fan Wong
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gluco Ltd
Original Assignee
Gluco Ltd
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
Priority claimed from GB0320662A external-priority patent/GB0320662D0/en
Priority claimed from GB0405138A external-priority patent/GB0405138D0/en
Application filed by Gluco Ltd filed Critical Gluco Ltd
Publication of WO2005023950A2 publication Critical patent/WO2005023950A2/fr
Publication of WO2005023950A3 publication Critical patent/WO2005023950A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin 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
    • 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
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/12—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
    • C08J5/121—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives by heating
    • 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
    • C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J151/06—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
    • 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
    • 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
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/559—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving the fibres being within layered webs
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/593—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives to layered webs
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H13/00—Other non-woven fabrics
    • 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
    • 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
    • B32B2323/10—Polypropylene
    • 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
    • B32B2605/003—Interior finishings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen
    • C08L23/0853—Ethene vinyl acetate copolymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • 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
    • C08L2666/06—Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • 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
    • 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
    • C09J2451/00—Presence of graft polymer

Definitions

  • This invention relates to an adhesive particularly but not exclusively adapted for use in engineering applications and comprising modified polypropylene as a base material.
  • Our earlier UK patent application 00265507.4 discloses a low melting point, low viscosity polypropylene containing adhesive suitable for use in high-speed manufacture of packaging.
  • WO95/24449 discloses an adhesive composition comprising maleic anhydride-grafted propylene and grafted ethylene/vinyl acetate copolymer.
  • an adhesive comprises:- (a) about 80 to aboutl00% of a melt blend of about 40 to about 98% polyalphaolefin having at least one monomer which has been grafted with about 0.05 to about 5% of at least 1 ethylenically unsaturated carboxylic acid or derivative thereof having a molecular weight distribution of 1.5 to 4.0 and a melt flow index not less than 20; (b) about 2 to about 60% of at least one copolymer of ethylene and vinyl acetate; (c)) 0 to about 20% of an opacifier; (d) optional further ingredients; wherein the total amount of components (a) and (b) is from about 80 to 100% of the composition and wherein the percentages of the components are selected to total 100% According to a second aspect of the present invention there is provided a method of uniting surfaces of opposed layers using an adhesive composition in accordance with the first aspect of this invention, wherein the composition is in the form of a film, strands or pellets, comprising the
  • Percentages and other proportions referred to in this specification are by weight unless indicated otherwise.
  • Other components may be added to the formulation to extend the range of applications such as organic or inorganic particulates to alter the modulus or ferromagnetic materials to allow dielectric heating.
  • the processing and properties of the adhesive films are aided by the addition of inorganic and/or organic micro/nano particulates alone or in combination at appropriate levels and in the range 0.01 - 70% wt/wt.
  • the mean particle size and particle size distribution of the particulate additives influence clarity of the film as well as processing end use properties. There are optimal particle sizes and size distributions for the control of different properties at any given loading in the adhesive.
  • An adhesive composition in accordance with the present invention may be applied onto a substrate by doctoring, melt casting, melt spraying, solution casting, emulsion casting or by other means. It may also be formed into a film or fibrous network which can be applied onto a substrate in a variety of ways such as compression, compaction and lamination.
  • a film composed of an adhesive of the present invention can be employed as a free-standing film.
  • the adhesive composition maybe formed into rods, pellets or otherwise shaped portions to facilitate application to a substrate.
  • the adhesive might be pre-coated to substrates for subsequent use, e.g. a bi-layer or multiple layered film where the adhesive is, in the final product, the surface coating.
  • Films or other structures formed from compositions of this invention may have the advantage of being printable; the ink being applied as an aqueous, non-aqueous or molten form. They may also be paintable and accept sputtered metallic coatings. Paint formulations may be applied as an aqueous suspension, a non-aqueous solution/suspension or powder form.
  • the films or structures not containing particulate additives may be transparent, that is, having no apparent phase separation. Transparency is advantageous and unexpected, particularly because polypropylene blends containing ethylene vinyl acetate are commonly either translucent or opaque.
  • the polyalphaolefin is preferably a polymer of an alphaolefin where at least one of the monomers present in the polyalphaolefin has the formula (CH 2 CHR) n , wherein R is C,-C 6 alkyl.
  • the preferred polyalphaolefin is selected from polypropylene and copolymers thereof.
  • the rheological behaviour of the formulations described in this invention is important for film forming, doctoring and other processing methodologies for which they are used.
  • the rheological characteristics of the formulations are also important in relation to their capacity to wet substrates. Typical shear and elongational viscosities of a preferred formulation are shown in Figure 1 and Figure 2, respectively.
  • the functionalised polypropylene maybe produced directly by reactive modification by using radical chemistry where the functional group can be isocyanate, anhydride, amine, alcohol or acid, preferably having a melt flow index of about 10 to about 120, preferably about 10 to about 95, more preferably about 50 to about 60 at 190°C.
  • the functionalised polypropylene may also be made by copolymerisation of propylene with suitable diolefinc monomer and then subsequent modification of the pendant unsaturation. Grafted polypropylenes which may be employed have a molecular weight distribution
  • Mw/Mn 1.5 to 4.0, preferably 1.5 to 3.0, more preferably 2.5 to 3.0, most preferably 2.7 to 2.8.
  • MFI melt flow index
  • Preferred grafted polypropylenes have a weight average molecular weight (Mw) about 118,000 and number average molecular weight (Mn) about 4,300.
  • Maleic anhydride grafted polypropylenes are preferred.
  • a preferred maleic anydride grafted polypropylene is Exxelor P01015.
  • 2,2'-dimethyl-l,3-isopropenyl benzyl isocyanate also known as dimethyl meta-isopropenyl benzyl isocyanate
  • TMI 2,2'-dimethyl-l,3-isopropenyl benzyl isocyanate
  • TMI dimethyl meta-isopropenyl benzyl isocyanate
  • the ethylenically unsaturated carboxylic acid or derivative in the polalphaolefin is from about 0.05% to about 5%.
  • the unmodified ethylene/vinyl acetate copolymer is preferably an unmodified random or statistical copolymer having a melt flow index of not more than 800, preferably not more than 600, more preferably not more than 400 at 190°C.
  • a vinyl acetate content of up to 40% in the copolymer may be employed, preferably around 28%.
  • a preferred EVA copolymer is Escorene 40028.
  • Preferred adhesives in accordance with this invention do not incorporate an opacifier.
  • opacifiers which can be used include inorganic particulates, for example, mica, talc and inorganic sulphates, carbonates, halides and pigments.
  • Organic opacifiers which can be used include insoluble particulate materials including polymers such as polystyrene, polyesters, polyamides, polyacrylates, polymethacrylates, inks, pigments and colorants.
  • Adhesives in accordance with this invention may be applied in solid form to a workpiece, for example, as a sheet of film, by spraying or as pellets and then heated to cause melting of the adhesive. Conventional hot compression and compaction using hot plates or a heated press may be employed. Alternatively, a metal workpiece or substrate may be heated to cause melting of the adhesive.
  • Bonding with these heat-activated adhesives is achieved by the application of heat.
  • Any conventional heating processes can be employed such as hot lamination (batch and continuous), infrared heating (heating efficiency may be enhanced by using infrared absorbent materials in the composition), hot calendering, hot air welding, ultrasonic welding, dielectric or induction heating (with the use of appropriate additives such as metal particles).
  • hot lamination batch and continuous
  • infrared heating heating efficiency may be enhanced by using infrared absorbent materials in the composition
  • hot calendering hot air welding
  • ultrasonic welding ultrasonic welding
  • dielectric or induction heating with the use of appropriate additives such as metal particles.
  • Extrusion or injection moulding of the adhesive onto heating wire or mats is a convenient means of producing tailored components such as gaskets or polypropylene spacer in engineering devices.
  • Bonding of polypropylene (PP) components with the adhesives in accordance with this invention is usually carried out at temperatures around 155 ° C which is belo the melting point of PP (approximately 165 ° C) and distortion problems with the substrate can be avoided completely when the bonding process is carried out under properly controlled conditions.
  • the bond is formed as soon as the molten adhesive is cooled and solidified between the wetted surfaces of the adherends . No curing is required.
  • the adhesives in accordance with this invention can be used in the form of pellets (e.g. for co-extrusion and injection moulding), strands or rods (e.g. for hot air and induction welding), and so on.
  • thermoset decorative laminate e.g. Formica® panels for decorative panels suitable for container, railcar, bus and coach construction.
  • a thermoset decorative laminate is Formica®.
  • Those skilled in the art can design specific formulations to achieve optimal wetting, bond strength and processability for any given means of heat application to effect good bonds.
  • the invention also provides an article adapted to be secured to another article including a surface carrying a pre-coated layer of an adhesive in accordance with the present invention.
  • Compositions in accordance with this invention may be manufactured by melt blending of the key components in a batch blender or by using an extruder, for example, a twin-screw extruder. This is the preferred method as the adhesives can be pelletised for processing by standard injection moulding, extrusion or a range of other commonly used polymer processing methods.
  • the adhesive can be readily formed into different shapes e.g.
  • the adhesive formulation described is particularly well suited to the bonding of polypropylene to polypropylene and the substrates can be in the form of sheet, woven fabric or other physical forms.
  • the adhesives in accordance with this invention may also be used for the bonding of many different substrates or combination of substrates including: aluminium, steel, copper, brass, zinc coated steel, iron, titanium, glass, ceramics, cellulosic materials, melamine laminates, phenolic laminates, glass filled thermoplastic and thermoset composites, polyurethane composites, synthetic and natural fibre composites and leather.
  • the invention finds a particular application in manufacture of engineering mechanical components or articles wherein high bond strength is desired. Bonding of polypropylene surfaces is facilitated.
  • a film in accordance with this invention may be dispensed between surfaces to be bonded, nipped by compression of the surfaces and then heated to cause melt adhesion.
  • Large flat surfaces can be bonded in a continuous process.
  • Large curved or other shaped surfaces can be thermoformed in a semi-continuous process.
  • Spraying results in the poor control of the thickness, integrity and density of the adhesive layer.
  • Laminated panels may be conveniently manufactured in a continuous manner using many different combinations of fabric, PP sheet, or metal films, or other adherends known to those skilled in the art.
  • Figure 1 is a graph comparing shear viscosity vs. shear rate for an adhesive in accordance with this invention.
  • Figure 2 is a graph comparing elongational viscosity vs. shear rate for an adhesive in accordance with this invention.
  • Figure 3 is a graph showing the variation of bond strength, between polypropylene and polypropylene, with bonding temperature.
  • Figure 4 is a graph showing the variation of bond strength, between polypropylene and mild steel, with bonding temperature.
  • An APV 2030, 30 mm diameter screw, 40:1 L/D, co-rotating twin-screw extruder was used in a continuous method of manufacturing of the adhesive.
  • a mixture of maleic anhydride functionalised polypropylene having a melt flow index of 50-60 at 190°C, Mw about 118000, Mn about 43000 and MWD of 2.7 to 2.8 and ethylene/vinyl acetate copolymer (EVA), (Escorene 40028) pellets at a weight ratio of 80:20 were fed continuously into the hopper of the extruder.
  • the feed rate was approximately 17.5 kgh "1 and the extrusion temperature was approximately 170°C.
  • the extrudate was then passed through a water bath.
  • the solidified extrudate was finally cut up into suitably sized pellets for further applications. This process was later scaled up to manufacture adhesive pellets at a throughput rate of 250 kgh "1 .
  • the pellets so produced were used for conventional extrusion, injection moulding and a range of other commonly used polymer processing methods.
  • Example 2 Approximately 4 kg of the adhesive pellets as described in Example 1 was dried overnight in an oven at 60°C. The pre-dried pellets were then used to extrude into rolls of film of approximately 250 mm in width and 70 microns in thickness. The extrusion temperature was approximately 180°C and the wind-up speed was 1.5 mmin "1 . This process was later.scaled up to manufacture adhesive film of 2.4 m in width and 30-150 microns in thickness.
  • Example 3 The thermal behaviour of the adhesive as described in Example 1 was examined by differential scanning calorimetry and melt rheometry. The onset and the peak of melting of the adhesive were found at approximately 130°C and 145°C respectively. Typical shear and elongational viscosities of the preferred formulation, measured at 170°C, are shown in Figure 1 and Figure 2 respectively.
  • Example 4 The bond strength of the adhesive as described in Example 1 was examined by lap-shear test of single overlap joints (with reference to BS 5350 : Part C5 : 1990, ASTM D 1002-94 and D3164-97) and T-peel test (with reference to BS 5350 : Part C12 : 1994 and ASTM D 1876- 95). Sheets of glass-filled polypropylene, aluminium and mild steel were used to prepare all the test samples. The adhesive films, as described in Example 2, were used to prepare the bonds. The sample surface was degreased with acetone prior to bonding. No further surface treatment was carried out. The bonding temperature and contact time were 155°C and 1 minute respectively. A gentle pressure was applied to ensure a good contact between the adhesive and the bonding surfaces. Results are shown in Tables 1 and 2. Table 1. Variation of shear strength (values in MPa) of the adhesive film, as described in Example 2, on various adherends with temperature.
  • Example 5 The effect of bonding temperature on the bond strength of the adhesive, as described in Example 1, was examined by T-peel test (with reference to BS 5350 : Part C12 : 1994 and ASTM D 1876-95). Sheets of polypropylene, 3 mm in thickness, were used to prepare all the test samples. The adhesive films, as described in Example 2, were used to prepare the bonds. The sample surface was degreased with acetone prior to bonding. No further surface treatment was carried out. The bonding temperatures were 145, 150, 153, 155, 158, 160 and 165°C respectively. The contact time was 5 minutes. A gentle pressure was applied to ensure a good contact between the adhesive and the bonding surfaces. Results are shown in Figure 3. The best bond strength was found at 155°C. This temperature is conveniently below the melting temperature of polypropylene (around 165°C).
  • Example 6 The ability of the adhesive, as described in Example 1, to bond polypropylene to metals at various bonding temperatures was examined by T-peel test (with reference to BS 5350: Part C12 : 1994 and ASTM D 1876-95). Sheets of polypropylene and mild steel were used to prepare all the test samples. The adhesive films, as described in Example 2, were used to prepare the bonds. The sample surface was degreased with acetone prior to bonding. No further surface treatment was carried out. The bonding temperatures were 145, 150, 155, 160 and 165°C, respectively. The contact time was 4 minutes. A gentle pressure was applied to ensure a good contact between the adhesive and the bonding surfaces. Results are shown in Figure 4. The best bonding temperature was found at 155°C.
  • Example 7 The bonding of polypropylene box-section to itself has been demonstrated by using the adhesive film, as described in Example 2, as bonding agent.
  • a Heraus infra-red heating equipment in the form of a chamber approximately 1 m in length, was used to activate the adhesive in the bonding process.
  • the infra-red heating elements were positioned approximately 20 cm above the surfaces of the components being joined.
  • the samples which were two halves of a polypropylene box-section, were then heated for approximately 15-20 seconds. When the samples had emerged from underneath the heating elements, a sheet of adhesive film, as described in Example 2, was placed over the heated surface of one of the samples and melted. The second sample was then inverted so that the two heated surfaces could be placed in intimate contact with each other under pressure. A bond was formed when the molten adhesive had cooled down and solidified.
  • Ultrasonic energy can be used to activate the adhesive film, as described in Example 2, for the bonding of polypropylene components.
  • Single-lap-shear joints were prepared by ultrasonically joining two polypropylene coupons (each 2 mm thick) together, using the adhesive film, as described in Example 2, as bonding agent. The top coupon was placed directly beneath the ultrasonic horn. The two coupons were clamped together to avoid slippage induced by the molten adhesive during bonding. The joint area was approximately 25 mm x 25 mm. The bond strength of these joints was then examined using a tensile tester with a cross-head speed of 100 mm mur 1 . The joints remained intact whilst the polypropylene coupons were necked and drawn during the test.
  • Example 9 Semi-translucent isotropic polypropylene, approximately 3 mm thick, was laser-welded at different laser pass rates to 0.7 mm mild steel plate, using an adhesive film as described in Example 2. The effectively bonded area varied greatly dependent on the speed of the laser over the joint. The laser-welded samples were then cut into 25 mm parallel strips for testing their lap-shear strength. Results are shown in Table 3. The most effective laser speed over the material to effect good bonding in this example is in the region of 200 mmmur 1 but this changes with laser power and the substrates being bonded. When the substrate is opaque but conducts heat rapidly, as in the case for most metals, it is possible to achieve similar bond strengths by applying the laser heating to the metal surface.
  • Composites comprising a sandwich structure of hot-compacted-PP sheet/PP foam/hot- compacted-PP sheet or hot-compacted-PP sheet/PP honeycomb/hot-compacted-PP sheet were prepared in a continuous laminating process using the adhesive film, as described in Example 2, as bonding agent.
  • the laminating temperature and speed were 160°C and 3 mmur 1 respectively.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

Cette invention concerne une composition adhésive comprenant: (a) entre environ 80 et 100 % d'un mélange en fusion renfermant entre environ 40 et 98 % de polyalphaoléfine comprenant au moins un monomère présentant une structure donnée et ayant été greffé avec environ 0,05 à 5 % d'au moins un acide carboxylique éthyléniquement insaturé ou un dérivé de celui-ci; (b) entre environ 2 et 60 % d'au moins un copolymère d'éthylène et d'acétate de vinyle; (c) entre 0 et environ 20 % d'un opacifiant; et (d) d'autres ingrédients facultatifs. La quantité totale des composants (a) et (b) représente entre environ 80 et 100 % de la composition, les pourcentages des composants étant sélectionnés de façon qu'ils totalisent 100 %.
PCT/GB2004/003795 2003-09-04 2004-09-06 Adhesif Ceased WO2005023950A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0320662A GB0320662D0 (en) 2003-09-04 2003-09-04 Adhesive
GB0320662.0 2003-09-04
GB0405138A GB0405138D0 (en) 2004-03-06 2004-03-06 Adhesive
GB0405138.9 2004-03-06

Publications (2)

Publication Number Publication Date
WO2005023950A2 true WO2005023950A2 (fr) 2005-03-17
WO2005023950A3 WO2005023950A3 (fr) 2005-05-12

Family

ID=34276823

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/003795 Ceased WO2005023950A2 (fr) 2003-09-04 2004-09-06 Adhesif

Country Status (1)

Country Link
WO (1) WO2005023950A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100395301C (zh) * 2006-07-18 2008-06-18 山东久隆高分子材料有限公司 大口径聚乙烯管道接口密封用纳米复合热熔胶
US10632707B2 (en) 2015-11-19 2020-04-28 3M Innovative Properties Company Multilayer structural adhesive film

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1239659C (zh) * 1995-09-12 2006-02-01 三井化学株式会社 粘合的乙烯共聚物树脂组合物和含它的层压材料
US6166142A (en) * 1998-01-27 2000-12-26 E. I. Du Pont De Nemours And Company Adhesive compositions based on blends of grafted metallocene catalyzed and polar ethylene copolymers
GB0102228D0 (en) * 2001-01-29 2001-03-14 Gluco Ltd Adhesive

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100395301C (zh) * 2006-07-18 2008-06-18 山东久隆高分子材料有限公司 大口径聚乙烯管道接口密封用纳米复合热熔胶
US10632707B2 (en) 2015-11-19 2020-04-28 3M Innovative Properties Company Multilayer structural adhesive film

Also Published As

Publication number Publication date
WO2005023950A3 (fr) 2005-05-12

Similar Documents

Publication Publication Date Title
EP0134958B1 (fr) Stratifiés métal-plastique-métal déformables
KR900003786B1 (ko) 중합체 발포체의 고주파 적층화
CA2734738C (fr) Composites legers aptes a la mise en forme
KR100743355B1 (ko) 박리 강도가 크고 응집 파괴도가 높은 저온 활성화 접착제조성물
CA2532198C (fr) Stratifie metal-polyamide/polyethylene-metal
US5089556A (en) Adhesive, RF heatable grafted polymers and blends
JPH04227935A (ja) アルミニウムクラッディングとランダムガラスマット強化ポリプロピレンシ―トの接合
US7037968B2 (en) Adhesive
WO2005023950A2 (fr) Adhesif
JPS6156085B2 (fr)
JPH07122056B2 (ja) 複合型制振材料用組成物
EP0568615B1 (fr) Procede de formation d'un corps stratifie
JPS5962613A (ja) 変性ポリオレフインの製造方法
JP2600570B2 (ja) 複合シート
JPS61152443A (ja) 積層物およびその製造法
CA1128851A (fr) Stratifies metal-plastique-metal faconnables
JP3029321B2 (ja) 積層物の製造方法
WO2025202440A1 (fr) Matériau d'amortissement acoustique durable
JP2024176754A (ja) ポリプロピレン多層シート
CN120157989A (zh) 一种聚丙烯复合材料及其制备方法和应用
JPH0151342B2 (fr)
JP2024045850A (ja) ホットメルト接着組成物
JPH05286037A (ja) 合板及びその製造方法
JPH0331576B2 (fr)
Ashley at Metal Box plc, R&D Division, Wantage, Oxon. OX12 9BP

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase