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
  • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
  • C09J11/02—Non-macromolecular additives
  • C09J11/04—Non-macromolecular additives inorganic
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
• • 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

Definitions

• the present invention further provides a method for inhibiting or preventing corrosion of a metal substrate which has been bonded to another substrate, the method comprising including particles comprising an inorganic oxide of silica or alumina having cations bound thereto in the adhesive composition being employed to bond the metal substrate to the other substrate, the particles being of a type which and present in the adhesive composition in an amount effective to inhibit or prevent corrosion of the metal substrate in the area thereof which is in contact with the adhesive composition.
• Structural adhesives form strong integral bonds between substrates. Bonds formed with structural adhesives have a room temperature bond strength, as measured by a test well known in the industry, referred to as a T-peel test, of at least 10 pounds per lineal inch (pli) on a bond line thickness of 0.010 inch (0.25mm). The upper limit on the structural bond strength would be the cohesive failure of the substrate or yielding of the substrate.
• the adhesive compositions of the present invention form room temperature T-peel bond strengths on a bond line thickness of 0.010 inch (.254 mm) of at least 12 pli, with preferred compositions having bond strengths greater than about 14 pli, and the most preferred compositions having bond strength greater than 17 pli.
• Epoxides that are useful in the adhesive composition of the present invention can be any organic compound having at least one epoxy ring that is polymerizable by ring opening. Preferred are organic compounds having an average epoxy functionality greater than one, and preferably at least two.
• the epoxides can be monomeric or polymeric, and aliphatic, cycloaliphatic, heterocyclic, aromatic or mixtures thereof. The more preferred epoxides are aromatic and contain more than 1.5 epoxy groups per molecule and most preferably more than 2 epoxy groups per molecule.
• the toughening agents which are useful in the present invention include polymeric compounds having both a rubbery phase and a thermoplastic phase, such as graft copolymers having a polymerized diene rubbery core and a polyacrylate or polymethacrylate shell; graft copolymers having a rubbery core with a polyacrylate or polymethacrylate shell; and elastomeric particles polymerized in situ in the epoxide from free-radical polymerizable monomers and a copolymeric stabilizer.
• polymeric compounds having both a rubbery phase and a thermoplastic phase such as graft copolymers having a polymerized diene rubbery core and a polyacrylate or polymethacrylate shell; graft copolymers having a rubbery core with a polyacrylate or polymethacrylate shell; and elastomeric particles polymerized in situ in the epoxide from free-radical polymerizable monomers and a copolymeric stabilizer.
• acrylate core-shell graft copolymers wherein the core or backbone is a polyacrylate polymer having a glass transition temperature (T g ) below about 0°C, such as polybutyl acrylate or polyisooctyl acrylate to which is grafted a polymer (shell) having a T g above 25 °C such as polymethylmethacrylate.
• T g glass transition temperature
• compositions of the invention or compositions to be used in the methods of the invention are substantially free of conventional corrosion inhibitors such as aluminum phosphates and chromate salts. Further, preferred methods of the invention rely on the use of an oxide of silica or alumina having cations bound thereto, and do not involve the use of other corrosion inhibitors such as aluminum phosphates or chromate salts either in the adhesive composition or as a pretreatment of one or both of the surfaces to be bonded before application of the adhesive.
• the prepared samples are conditioned for at least two hours at between 21 °C and 23 °C before testing to determine the initial (INIT) strength, and the aged samples are subjected to the aging conditions described below, and conditioned for 2 hours at between 21 °C and 23 °C before testing. Elevated temperature shear tests are run at the temperatures shown in the examples and samples are conditioned at the test temperature for at least 15 minutes, but no more than 30 minutes, before testing.
• the samples are subjected to a 5% salt spray at 35 °C according to ASTM Bl 17-90 and tested after 750 hours.
• An adhesive composition was prepared by mixing a 2: 1 volume ratio of Part B:Part A.
• the adhesive was made into lap shear samples as described above on substrates C and D at two cure conditions.
• Cure 1 indicates that the curing was done with a 6-second induction heating cycle to a temperature of 135 °C and then oven cured for 20 minutes at 170°C.
• Cure 2 indicates a room temperature (between about 21 °C to 23°) cure for 20 to 24 hours and a subsequent oven cure for 20 minutes at 170°C.
• Shear Test results are shown in Table 3.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Epoxy Resins (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 1994
  • 1994-11-04 JP JP7513439A patent/JPH09504820A/ja not_active Ceased
  • 1994-11-04 EP EP95902448A patent/EP0726928A1/de not_active Withdrawn
  • 1994-11-04 KR KR1019960702281A patent/KR960705899A/ko not_active Application Discontinuation
  • 1994-11-04 CA CA002175574A patent/CA2175574A1/en not_active Abandoned
  • 1994-11-04 WO PCT/US1994/012734 patent/WO1995012647A1/en not_active Application Discontinuation
  • 1994-11-04 CN CN94193996A patent/CN1134167A/zh active Pending

Non-Patent Citations (1)

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