WO1995020006A1 - Surface treatment of polymers - Google Patents
Surface treatment of polymers Download PDFInfo
- Publication number
- WO1995020006A1 WO1995020006A1 PCT/AU1995/000025 AU9500025W WO9520006A1 WO 1995020006 A1 WO1995020006 A1 WO 1995020006A1 AU 9500025 W AU9500025 W AU 9500025W WO 9520006 A1 WO9520006 A1 WO 9520006A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polymer
- coupling agent
- polymer matrix
- matrix composite
- composite material
- Prior art date
Links
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
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/02—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/08—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by flames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/101—Pretreatment of polymeric substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
- B05D3/141—Plasma treatment
- B05D3/142—Pretreatment
- B05D3/144—Pretreatment of polymeric substrates
-
- 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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
-
- 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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/22—Presence of unspecified polymer
- C09J2400/228—Presence of unspecified polymer in the pretreated surface to be joined
Definitions
- This invention relates to new methods of treating the surface of polymers and/or polymer matrix composite materials to modify the surface chemistry thereof. For example, it is desirable to treat the surface of polymers or polymer matrix composite materials to improve their ability for bonding to other materials including, but not limited to, adhesives, sealants, paints, and any other reactive and/or non-reactive organic, inorganic or metallic materials, or mixtures thereof.
- polymer we mean homo-polymers, co-polymers and/or their blends and alloys with other polymers and/or rubber, and polymer matrix composites.
- a strong and durable adhesive bond between a polymer substrate or a polymer matrix and another polymeric and/or non-polymeric material such as a thermoset, or thermoplastic resin, paint or coating.
- a polymer substrate e.g. flat sheet, or fibre, complex shaped article, or powder
- the adhesive, paint, coating, thermoplastic, thermoset resin or non-polymeric material there must be good adhesion between the substrate (eg. flat sheet, or fibre, complex shaped article, or powder) and the adhesive, paint, coating, thermoplastic, thermoset resin or non-polymeric material.
- the substrate eg. flat sheet, or fibre, complex shaped article, or powder
- the adhesive, paint, coating, thermoplastic, thermoset resin or non-polymeric material eg.
- polyolefins are difficult to bond due to the absence of specific surface chemical functional groups capable of providing reactive sites for the establishment of strong interfacial interactions such as acid-base interactions and/or the formation of chemical bonding (eg. covalent, ionic, etc.) between the untreated substrate and the adhesive, paint, matrix material or other adhering substance.
- Various types of surface treatments are available for increasing the bonding properties of polymers. Typical surface treatments for enhanced adhesion include: mechanical abrasion; corona discharge; flame treatment; plasma treatment; UV radiation, chemical oxidation with the use of oxidising agents; and introduction of functional groups by surface chemical grafting.
- Sho 58-132029 discloses a method of treating the surface of polymers comprising corona discharge or plasma treatment followed by a chemical treatments.
- the chemical treatment described refers to the combination of two or more of the following processes: treating with an acid; treating with an alkali; treating with a coupling agent such as a silane or a titanium-based coupling agent. Whilst the combination of treatments is shown as being effective for increasing the adhesive properties of polymeric substrates the need for at least two chemical process steps substantially increases the cost associated with industrial application.
- Japanese Patent Document No. Sho 64-80099 discloses a method of increasing the ability of polyimides to bond to adhesives by treating the surface of the polyimide with corona discharge, and then treating the surface with a silane based coupling agent.
- concentrations of silane based coupling agents must typically be such that the silane coverage rate is in the range of 25 to 50 mg/m2 when dry. This, although not specified in the invention, can be achieved upon application of a silane solution at the concentration estimated to be about 3.75% to 7.5%.
- the present invention provides a method of modifying at least part of the surface of a polymer or polymer matrix composite material including: i) oxidising at least part of the surface of the polymer or polymer matrix material, and ii) subsequently treating the oxidised surface with an organo-functional coupling agent and/or chelating agent, simultaneously with a static and/or high frequency alternating physical field.
- the method of the invention may be used in respect of any suitable polymer or polymer matrix composite material.
- a polyolefin such as low density polyethylene (LDPE), polypropylene (PP), high density polyethylene (HDPE), ultra high molecular weight polyethylene (UHMWPE), or blends of polyolefins with other polymers or rubber.
- LDPE low density polyethylene
- PP polypropylene
- HDPE high density polyethylene
- UHMWPE ultra high molecular weight polyethylene
- blends of polyolefins with other polymers or rubber may also be used in respect of other difficult to bond materials or polymeric materials such as, Acetal, PVDF, teflon (PTFE), polystyrene, PMMA, PVC, ABS, EDPM * aramid fibres, ultra-high modulus polyethylene fibres or carbon fibres.
- any suitable method may be used to initially oxidise at least part of the surface of the polymer or polymer matrix composite.
- Such techniques include corona discharge, chemical oxidation, flame treatment, plasma treatment, or UV radiation.
- the technique of corona discharge, flame treatment or chromic acid treatment is preferred.
- Suitable corona discharge energies range from 0.1-5000mJ/mm2 but more preferably 10-80 mJ/mm ⁇ .
- d electrode diameter
- V ! speed of treating table
- v 2 speed of conveyor tape (i.e. continuous treatment)
- the range of suitable energies is 5-5000 Watts for 0.1 seconds - 30 minutes, but more preferably 20-40
- any known flame treatment may be used to initially oxidise at least part of the surface of the polymer or polymer matrix material.
- any known chemical oxidation may be used to initially oxidise at least part of the surface of the polymer or polymer matrix material.
- chromic acid treatment such as those described in "Adhesives Technology Handbook", Arthur H Landrock, Noyes Publications, USA 1985, may be used.
- any suitable organo-functional coupling agent or chelating agent may be used.
- any suitable organo-functional silane, organo- zirconate, organo-titanate, organo-tin or organo-aluminate may be used.
- These coupling agents may be applied from solution, vapour or any type of mechanical dispersion of a pure coupling agent or their solution and/or mixtures in any suitable solvent. If used as a solution the coupling agent may be applied as a water-based solution or in non-aqueous solution with a solvent such as an organic solvent or a mixture of both.
- Preferred solvents used for preparing the solution are water, and alcohols (eg. isopropyl alcohol or ethyl alcohol).
- any suitable concentration of coupling agent may be present in the solution.
- concentration of coupling agent is at least 0.0000025% and ranges up to approximately 0.25%.
- the method of the present invention allows for use of very low concentrations of coupling agents which minimises the cost of the treatment.
- concentrations which can be used in the method of the invention were previously thought to be not effective to modify the surface of a polymer or polymer matrix composite material.
- the organo-functional coupling agent or chelating agent may be applied for any suitable time period, for example from 0.01 seconds to 6 hours. Preferably, the compounds are applied for 1 to 30 seconds.
- organo-functional silane When used, it preferably has the general structure
- the organofunctional silane has the structure X a Si(OR) b where X is an non-hydrolyzable organo-functional group bonded to silicone through a stable covalent bond, R is any suitable alkyl group, preferably methyl or ethyl, a is an integer from 1 to 3 and b is 4-a.
- the silanol groups obtained after hydrolysis of the alkoxy groups may react with the hydroxyl and/or other functional groups introduced onto the surface of the polymer.
- an organosilicon or organometallic or chelating compound(s) may be chosen in which the organo-functional groups have the maximum reactivity with the adhesive.
- an amino-functional coupling agent would be selected.
- an epoxy resin an amino-functional or epoxy-functional coupling agent would be chosen.
- any suitable static and/or high frequency alternating physical field may be used.
- any one of the following fields may be used, ultrasonic, microwave, radio-frequency, heat energy or a combination thereof.
- an ultrasonic field is used.
- the preferred frequency range of ultrasonic energy field ranges between 1 to 500 kHz, more preferably between 10 to 50 kHz.
- the treated surface may be adhesively bonded to another substrate, or coated by a paint, or a metallic coating, or printed.
- any suitable adhesive may be applied to the treated surface and then the other substrate is brought into contact with the adhesive.
- suitable adhesives include, for example, structural acrylic adhesives, epoxy adhesives, sealants, contact adhesives or thermoplastic adhesives. Examples of particularly suitable adhesives include, but are not limited to Cyanoacrylate Loctite 406, acrylic Permabond F241, epoxy Araldite 138, and polyurethane Tyrite 7520A/B.
- any suitable self adhesive tape may be applied to the treated surface and then the other substrate may be brought into contact with the tape.
- any suitable paint or ink may be used.
- any suitable metallic material may be used.
- the surface of a range of substrates are treated by various methods and bonded.
- the specimens were allowed to cure for 72 hours prior to strength testing using single lap-shear test with an overlap of 3 mm and an Instron mechanical tester.
- the test rate was 10 mm/min.
- the various surface treatments were: i) no treatment ii) air corona discharge only (for LDPE a corona discharge level of 453 mJ/mm 2 was used and for HDPE and PP a corona discharge level of 755 mJ/mm 2 was used) iii) air corona discharge followed by dipping the substrate in 0.01% Z- 6020 in isopropanol [Z-6020;- (N - (2-aminoethyl) - 3 - aminopropyl-trimethoxy silane)] for 30 seconds and iv) air corona discharge followed by dipping for 30 sec the substrate in
- the samples were treated with air corona discharge at a level of 755mJ/mm 2 .
- the samples were then either not treated any further prior to applying the adhesive or dipped in a solution of Z-6020 or TEAZ (Triethanolamine zirconate-organozirconate) for 30 seconds or dipped in the same types of solutions whilst simultaneously applying ultrasonic energy to the solution at 35kHz for 30 seconds.
- Z-6020 or TEAZ Triethanolamine zirconate-organozirconate
- Epoxy HDPE 755 11.9 14.2 (Araldite 138) P 16.1 5.7 10.4
- Example 5 In this example the surface of low density polyethylene (LDPE), high density polyethylene (HDPE), and polypropylene (PP) were treated by air corona discharge only, or by air corona discharge followed by a 30 second dip in 0.01% Z-6020 in isopropanol with simultaneous ultrasonic energy.
- LDPE low density polyethylene
- HDPE high density polyethylene
- PP polypropylene
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Graft Or Block Polymers (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9506628A BR9506628A (en) | 1994-01-21 | 1995-01-20 | Process for modifying at least part of the surface of a polymer or polymer matrix composite material. Process for bonding a first polymer or polymer matrix composite material to a second material. polymer or polymer matrix composite material and process for bonding a metallic material to a polymer or polymer matrix composite material |
JP7519253A JPH09508157A (en) | 1994-01-21 | 1995-01-20 | Surface treatment of polymer |
MX9602811A MX9602811A (en) | 1994-01-21 | 1995-01-20 | Surface treatment of polymers. |
DE69531394T DE69531394T2 (en) | 1994-01-21 | 1995-01-20 | SURFACE TREATMENT OF POLYMERS |
US08/676,287 US5879757A (en) | 1994-01-21 | 1995-01-20 | Surface treatment of polymers |
EP95906221A EP0740681B1 (en) | 1994-01-21 | 1995-01-20 | Surface treatment of polymers |
AT95906221T ATE246215T1 (en) | 1994-01-21 | 1995-01-20 | SURFACE TREATMENT OF POLYMERS |
AU14510/95A AU680716B2 (en) | 1994-01-21 | 1995-01-20 | Surface treatment of polymers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPM3459 | 1994-01-21 | ||
AUPM3459A AUPM345994A0 (en) | 1994-01-21 | 1994-01-21 | Surface treatment of polymers |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995020006A1 true WO1995020006A1 (en) | 1995-07-27 |
Family
ID=3778081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU1995/000025 WO1995020006A1 (en) | 1994-01-21 | 1995-01-20 | Surface treatment of polymers |
Country Status (10)
Country | Link |
---|---|
US (1) | US5879757A (en) |
EP (1) | EP0740681B1 (en) |
JP (1) | JPH09508157A (en) |
AT (1) | ATE246215T1 (en) |
AU (2) | AUPM345994A0 (en) |
BR (1) | BR9506628A (en) |
CA (1) | CA2180935A1 (en) |
DE (1) | DE69531394T2 (en) |
MX (1) | MX9602811A (en) |
WO (1) | WO1995020006A1 (en) |
Cited By (11)
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WO1997000899A1 (en) * | 1995-06-22 | 1997-01-09 | Yuri Gudimenko | Surface modification of polymers and carbon-based materials |
WO1999001233A1 (en) * | 1997-06-30 | 1999-01-14 | Ge Bayer Silicones Gmbh & Co. Kg | Method for coating silicone elastomers |
EP0920459A1 (en) * | 1996-08-16 | 1999-06-09 | Integument Technologies, Inc. | Transition metallohalopolymers |
US5922161A (en) * | 1995-06-30 | 1999-07-13 | Commonwealth Scientific And Industrial Research Organisation | Surface treatment of polymers |
US6200682B1 (en) | 1996-12-11 | 2001-03-13 | Boise Cascade Corporation | Apparatus and method for continuous formation of composites having filler and thermoactive materials and products made by the method |
US6605245B1 (en) | 1997-12-11 | 2003-08-12 | Boise Cascade Corporation | Apparatus and method for continuous formation of composites having filler and thermoactive materials |
WO2004043614A1 (en) * | 2002-11-07 | 2004-05-27 | Michigan State University | Chemical functionalization of material surfaces using optical energy and chemicals |
US6821614B1 (en) | 1996-12-11 | 2004-11-23 | Boise Cascade Corporation | Apparatus and method for continuous formation of composites having filler and thermoactive materials, and products made by the method |
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US8557343B2 (en) | 2004-03-19 | 2013-10-15 | The Boeing Company | Activation method |
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US20030168157A1 (en) * | 1992-01-06 | 2003-09-11 | Kuenzel Kenneth J. | Fluoropolymer composite tube and method of preparation |
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JP3139419B2 (en) * | 1997-06-30 | 2001-02-26 | 株式会社ブリヂストン | Construction method of sealing material |
US6248614B1 (en) * | 1999-03-19 | 2001-06-19 | International Business Machines Corporation | Flip-chip package with optimized encapsulant adhesion and method |
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US6406748B2 (en) | 2000-02-14 | 2002-06-18 | Henkel Corporation | Prevention of particle redeposition onto organic surfaces |
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US20080063693A1 (en) | 2004-04-29 | 2008-03-13 | Bacterin Inc. | Antimicrobial coating for inhibition of bacterial adhesion and biofilm formation |
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US9089745B2 (en) * | 2010-12-23 | 2015-07-28 | Taylor Made Golf Company, Inc. | Plasma treatment of golf club components and bonding thereof |
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EP0311989A1 (en) * | 1987-10-14 | 1989-04-19 | Dyneema V.O.F. | Surface treatment of polyethylene fibers |
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-
1994
- 1994-01-21 AU AUPM3459A patent/AUPM345994A0/en not_active Abandoned
-
1995
- 1995-01-20 CA CA002180935A patent/CA2180935A1/en not_active Abandoned
- 1995-01-20 MX MX9602811A patent/MX9602811A/en not_active IP Right Cessation
- 1995-01-20 AT AT95906221T patent/ATE246215T1/en not_active IP Right Cessation
- 1995-01-20 US US08/676,287 patent/US5879757A/en not_active Expired - Fee Related
- 1995-01-20 WO PCT/AU1995/000025 patent/WO1995020006A1/en active IP Right Grant
- 1995-01-20 JP JP7519253A patent/JPH09508157A/en not_active Ceased
- 1995-01-20 DE DE69531394T patent/DE69531394T2/en not_active Expired - Fee Related
- 1995-01-20 BR BR9506628A patent/BR9506628A/en not_active Application Discontinuation
- 1995-01-20 AU AU14510/95A patent/AU680716B2/en not_active Ceased
- 1995-01-20 EP EP95906221A patent/EP0740681B1/en not_active Expired - Lifetime
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EP0311989A1 (en) * | 1987-10-14 | 1989-04-19 | Dyneema V.O.F. | Surface treatment of polyethylene fibers |
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US5948484A (en) * | 1995-06-22 | 1999-09-07 | Gudimenko; Yuri | Modification of subsurface region of polymers and carbon-based materials |
EP0949277A2 (en) * | 1995-06-22 | 1999-10-13 | Yuri Gudimenko | Surface modification of polymers and carbon-based materials |
EP0949277A3 (en) * | 1995-06-22 | 2000-12-27 | Yuri Gudimenko | Surface modification of polymers and carbon-based materials |
WO1997000899A1 (en) * | 1995-06-22 | 1997-01-09 | Yuri Gudimenko | Surface modification of polymers and carbon-based materials |
US5922161A (en) * | 1995-06-30 | 1999-07-13 | Commonwealth Scientific And Industrial Research Organisation | Surface treatment of polymers |
EP0920459A1 (en) * | 1996-08-16 | 1999-06-09 | Integument Technologies, Inc. | Transition metallohalopolymers |
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US6863512B2 (en) | 1996-12-11 | 2005-03-08 | Officemax Incorporated | Apparatus and method for continuous formation of composites having filler and thermoactive materials, and products made by the method |
US6200682B1 (en) | 1996-12-11 | 2001-03-13 | Boise Cascade Corporation | Apparatus and method for continuous formation of composites having filler and thermoactive materials and products made by the method |
US6821614B1 (en) | 1996-12-11 | 2004-11-23 | Boise Cascade Corporation | Apparatus and method for continuous formation of composites having filler and thermoactive materials, and products made by the method |
WO1999001233A1 (en) * | 1997-06-30 | 1999-01-14 | Ge Bayer Silicones Gmbh & Co. Kg | Method for coating silicone elastomers |
US6605245B1 (en) | 1997-12-11 | 2003-08-12 | Boise Cascade Corporation | Apparatus and method for continuous formation of composites having filler and thermoactive materials |
US7094451B2 (en) * | 1999-04-07 | 2006-08-22 | Board Of Trustees Of Michigan State University | Chemical functionalization of material surfaces using optical energy and chemicals |
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US8557343B2 (en) | 2004-03-19 | 2013-10-15 | The Boeing Company | Activation method |
WO2006086828A1 (en) * | 2005-01-21 | 2006-08-24 | Commonwealth Scientific And Industrial Research Organisation | Activation method using modifying agent |
KR101264450B1 (en) | 2005-01-21 | 2013-05-15 | 더 보잉 컴파니 | Activation method using modifying agent |
US9909020B2 (en) | 2005-01-21 | 2018-03-06 | The Boeing Company | Activation method using modifying agent |
US10888896B2 (en) | 2005-01-21 | 2021-01-12 | The Boeing Company | Activation method using modifying agent |
RU2539597C1 (en) * | 2013-12-02 | 2015-01-20 | Открытое акционерное общество "Завод им. В.А. Дегтярева" | Method for preparing and chemical processing of fluoroplastic components before adhesive bonding |
Also Published As
Publication number | Publication date |
---|---|
EP0740681A4 (en) | 1998-03-04 |
ATE246215T1 (en) | 2003-08-15 |
US5879757A (en) | 1999-03-09 |
DE69531394T2 (en) | 2004-06-09 |
EP0740681A1 (en) | 1996-11-06 |
CA2180935A1 (en) | 1995-07-27 |
BR9506628A (en) | 1997-09-16 |
DE69531394D1 (en) | 2003-09-04 |
AU680716B2 (en) | 1997-08-07 |
JPH09508157A (en) | 1997-08-19 |
AU1451095A (en) | 1995-08-08 |
EP0740681B1 (en) | 2003-07-30 |
MX9602811A (en) | 1997-06-28 |
AUPM345994A0 (en) | 1994-02-10 |
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