GB2220663A - Adhesives - Google Patents

Adhesives Download PDF

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Publication number
GB2220663A
GB2220663A GB8902698A GB8902698A GB2220663A GB 2220663 A GB2220663 A GB 2220663A GB 8902698 A GB8902698 A GB 8902698A GB 8902698 A GB8902698 A GB 8902698A GB 2220663 A GB2220663 A GB 2220663A
Authority
GB
United Kingdom
Prior art keywords
ethylene
composition according
vinyl ester
adhesives
cross
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.)
Withdrawn
Application number
GB8902698A
Other versions
GB8902698D0 (en
Inventor
Timothy James Mathias
Edward Cole
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.)
Bowthorpe Hellerman Ltd
Original Assignee
Bowthorpe Hellerman 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
Application filed by Bowthorpe Hellerman Ltd filed Critical Bowthorpe Hellerman Ltd
Publication of GB8902698D0 publication Critical patent/GB8902698D0/en
Priority to EP19890305561 priority Critical patent/EP0351047A3/en
Priority to AU37142/89A priority patent/AU3714289A/en
Publication of GB2220663A publication Critical patent/GB2220663A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • 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
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/04—Homopolymers or copolymers of ethene
    • C09J123/08—Copolymers of ethene
    • 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
    • C08L2666/28—Non-macromolecular organic substances
    • C08L2666/34—Oxygen-containing compounds, including ammonium and metal salts
    • 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
    • C08L2666/54—Inorganic substances

Abstract

A thermally curable, single pack adhesive composition comprises a hot melt adhesive ethylene-vinyl ester copolymer and a free radical cross-linking agent. In the examples, ethylene/vinyl acetate copolymers are cross-linked with t-butyl perbenzoate and azobisisobutyronitrile. The adhesives have excellent solvent resistance and high temperature strengths.

Description

Adhesives Ihe present invention is concerned with adhesives.
In order to obtain adhesives with high temperature strength and good resistance to solvent attack, a high degree of cross-linking is required. Up to now the most commonly available such adhesive is a two component epoxy resin.
Shis type of adhesive recuires the two components to be mixed and applied in situ, which is, of course, time consuming and difficult. There is therefore a need for pre-mixed one component adhesives. Known one component adhesives are generally uncurable (with consequent inferior high temperature and solvent resistance) or require curing at high temperattlres, e.g. in excess of 160"C. Such curable one component adhesives are typically therinally-activated hindered epoxy resins.
We have found that cross-linked hot melt adhesives based on ethylene-vinyl ester copolymers can have excellent solvent resistance and high temperature strengths.
According to the present invention, therefore, there is provided a thermally curable, single component composition, comprising a hot melt adhesive polymer comprising an ethylene-vinyl ester copolymer and a free-radical cross-linking agent therefor.
?ot only do the properties of the adhesive composition according to the invention surpass those of a typical one component epoxy resin, but the composition may be cured at lower temperatures, typically 120-160fiC. The composition according to the invention has the advantage that it can be cross-linked using a hot air gun or infra-red radiator. Until cure has taken place, the adhesive composition according to the invention functions as a typical hot melt, which therefore facilitates the accurate alignment of assembled artefacts whilst they are held in position by the viscous molten adhesive.
The cross-linking agent present in the adhesive composition according to the invention is typically a peroxide or azo compound, which may be employed in an amount of 2-207.
(such as about 1-12), based on the weight of the copolymer.
Typical peroxides are t-butyl perbenzoate, dicumyl peroxide, and benzoyl peroxide. A typical peroxide is azo-bis-isobutyronitrile.
The ethylene-vinyl ester copolymer is preferably an ethylene-vinyl acetate copolymer (EVA), although other ethylene-vinyl ester copolymers (such as ethylene-vinyl butyrate copolymers) may be employed, if wished. The copolymer typically contains 30 to 857 (such as 60 to 80%) by weight of ethylene, substantially all the remainder being constituted by units of the vinyl ester; minor amounts of non-deleterious comonomers may also be incorporated in certain circumstances. Examples of such comonomers include triallyl cyanurate, diethylene glycol dimethylacrylate, and trimethylol propane trimethacrylate.
The adhesive composition according to the invention is typically made up in a hot solvent, such as trichloroethylene, at 40-8ObC. In this solution form, the adhesive can be applied mechanically or manually to bodies to be bonded together. After removal of the solvent by drying the bodies are ready for assembly and curing. Tapes, films or the like may be cast from a solution of the adhesive composition according to the invention.
The adhesive can, in another embodiment, be extruded from the molten phase, in the form of a tape, film or the like.
The following adhesive formulations according to the invention are given by way of illustration only. All percentages quoted are by weight.
Formulation A.
Ingredient Supplier Approx % Ethylene/vinyl acetate copolymer Exxon/)tochem 65 t-Butyl Perbenzoate Interox 9 ATMl2 (cross linking agent) Incomer 5 Staboxal PCD (stabilizer) Bayer U.K. 5 SP553 (tackifier) Schenectady 14 Winnofil "SP" (fil7er) I.C.I. 2 Formulation B.
Ingredient Supplier Approx Ethylene/vinyl acetate copolymer Exxon/Atochem 66 Azo-bis-iso-butyronitrile Akzo Chemie 6 ATM6 (cross linking agent) Ancomer 10 SP553 (tackifier) Schenectady -16 Britomya M (filler) Croxton & Gary 2 Typical values obtained for these adhesives tested according to V.G.95-343 Part 18 were as follows: Polyethylene/aluminium shear strength at 23"C = 1315N 100 C = 249N 150 C = 41N Polyethylene/aluminium shear strength after immersion in: aviation fuel = 961N hydraulic fluid = 1308N lubricating oil = 1307N iso-propanol = 1328N 1,1,1 trichloroethane = 1148N methyl ethyl ketone = 946N water = 1177N Drum peel strength polyethylene/aluminium = 153N/25mm (Part 14) polyethylene/polyethylene = 127N/25mm

Claims (6)

  1. CLAIMS: 1. ; thermally curable, single component composition, comprising a hot melt adhesive polymer comprising an ethylene-vinyl ester copolymer and a free-radical cross-linking agent therefor.
  2. 2. A composition according to claim 1, wherein said ethylene-vinyl ester copolymer is an ethylene-vinyl acetate copolymer.
  3. 3. A composition according to claim 1 or 2, wherein said ethylene-vinyl ester copolymer comprises 30 to 85% by weight of ethylene.
  4. 4. A compositio7.) according to any of claims 1 to 3, which is in solution in an organic solvent.
  5. 5. A composition according to claim 4, wherein said solvent is trichloroethylene.
  6. 6. A composition according to any of claims 1 to 3, which is in the form of an extruded body.
GB8902698A 1988-07-14 1989-02-07 Adhesives Withdrawn GB2220663A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19890305561 EP0351047A3 (en) 1988-07-14 1989-06-02 Thermally curable adhesives and method of bonding
AU37142/89A AU3714289A (en) 1988-07-14 1989-06-28 Thermally curable adhesives and method of bonding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB888816824A GB8816824D0 (en) 1988-07-14 1988-07-14 Adhesives

Publications (2)

Publication Number Publication Date
GB8902698D0 GB8902698D0 (en) 1989-03-30
GB2220663A true GB2220663A (en) 1990-01-17

Family

ID=10640477

Family Applications (2)

Application Number Title Priority Date Filing Date
GB888816824A Pending GB8816824D0 (en) 1988-07-14 1988-07-14 Adhesives
GB8902698A Withdrawn GB2220663A (en) 1988-07-14 1989-02-07 Adhesives

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB888816824A Pending GB8816824D0 (en) 1988-07-14 1988-07-14 Adhesives

Country Status (1)

Country Link
GB (2) GB8816824D0 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617419A (en) * 1969-02-06 1971-11-02 Nat Distillers Chem Corp Adhesive and method for bonding cross linked polyolefins and other polymeric material
GB1259312A (en) * 1968-05-22 1972-01-05
US3862107A (en) * 1971-10-28 1975-01-21 Pennwalt Corp Method of curing polymers with azo compounds
GB1414520A (en) * 1972-12-05 1975-11-19 Akzo Nv Peroxidic compositions
US4460748A (en) * 1982-07-06 1984-07-17 Luperox Gmbh Process for crosslinking and, if desired, foaming natural or synthetic homo- and/or copolymers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1259312A (en) * 1968-05-22 1972-01-05
US3617419A (en) * 1969-02-06 1971-11-02 Nat Distillers Chem Corp Adhesive and method for bonding cross linked polyolefins and other polymeric material
US3862107A (en) * 1971-10-28 1975-01-21 Pennwalt Corp Method of curing polymers with azo compounds
GB1414520A (en) * 1972-12-05 1975-11-19 Akzo Nv Peroxidic compositions
US4460748A (en) * 1982-07-06 1984-07-17 Luperox Gmbh Process for crosslinking and, if desired, foaming natural or synthetic homo- and/or copolymers

Also Published As

Publication number Publication date
GB8816824D0 (en) 1988-08-17
GB8902698D0 (en) 1989-03-30

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)