WO2001005882A1 - Compositions de scellement glissantes - Google Patents

Compositions de scellement glissantes Download PDF

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Publication number
WO2001005882A1
WO2001005882A1 PCT/US2000/018555 US0018555W WO0105882A1 WO 2001005882 A1 WO2001005882 A1 WO 2001005882A1 US 0018555 W US0018555 W US 0018555W WO 0105882 A1 WO0105882 A1 WO 0105882A1
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WO
WIPO (PCT)
Prior art keywords
composition
lubricious
curable
agent
initiator
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PCT/US2000/018555
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English (en)
Inventor
Frederick F. Newberth, Iii
Paul J. Rachielles
John P. Breault
Thomas Fay-Oy-Lim
Peter J. Chupas
Richard O. Angus, Jr.
Original Assignee
Loctite Corporation
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Application filed by Loctite Corporation filed Critical Loctite Corporation
Priority to AU60753/00A priority Critical patent/AU6075300A/en
Publication of WO2001005882A1 publication Critical patent/WO2001005882A1/fr

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    • 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
    • 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
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules

Definitions

  • the present invention relates to lubricious sealant compositions that are applied to a host article, allowed to dry and subsequently cured.
  • inventive compositions are applied to an article, such as a hose commonly used in the assembly of engines in the automotive industry, allowed to dry in an uncured state, fitted into place on a housing and cured. Curing may be accomplished using various mechanisms, either under a separate step or under normal activity and use of the hose.
  • Sealants are often used in the automotive industry between matable parts, such as a housing and a hose. Sealing in such applications is necessary for the proper functioning of the automotive engine.
  • Non-curable sealants for hose/housing connections often involve merely a "soapy water" lubricant, which of course provides no sealing over time beyond that which is provided initially at the hose/housing interface.
  • Curable sealants may be generally applied to a portion of an article to be mated, allowed to cure and then assembled on the mated part. Once the sealant is cured, however, the surface lacks lubricity. For example, the cured surface of sealants, whose constituents are silicones, urethane-acrylates and the like, do not naturally exhibit lubricitity.
  • the present invention alleviates the above-mentioned drawbacks of conventional sealant compositions.
  • the present invention provides curable sealant compositions, which may advantageously be applied to one or more frictionally mating parts, dried to form a lubricous but adherent surface, and subsequently may be cured to enhance the seal therebetween
  • One particularly desirable application is to coat the interior diameter of a hose and fitted onto its mated part housing and thereafter cured
  • the lubricious sealant composition desirably incorporates a curable component which forms an elastomeric or flexible plastic material upon cure
  • a lubricious sealant composition which includes a curable elastomeric or flexible plastic resin and a lubricious agent incorporated therein
  • the lubricious agent is desirably suspended or dissolved therein and is available to impart lubricity to the cured surface of the resin
  • the lubricious agent may self-migrate to the surface of the cured composition to provide ongoing lubricity during use.
  • elastomeric and flexible plastic resins are useful in the present invention, including silicone resins, polyurethane resins, latex resins, acrylic resins, polybutadiene resins, ethylenepropylene diamine resins, polyisoprene rubbers, styrene-butadiene rubbers, polydisulfide rubbers, and the like
  • a cured lubricious sealant composition which has a lubricious surface imparted thereto by virtue of a lubricious agent being embedded therein
  • the lubricious agent is most desirably available to the surface to lower frictional forces when the cured surface is in frictional engagement with another surface
  • the lubricious agent lowers the coefficient of friction of the surface of the resultant article
  • a method of imparting surfacing lubricity to an elastomeric or flexible plastic material which includes providing a curable elastomeric or flexible plastic resin and embedding a lubricious agent within said resin such that the lubricious agent imparts lubricity to a cured surface of said resin
  • a lubricious sealant composition having a heat curable component, a lubricious agent and an initiator
  • the composition desirably dries to a lubricious adherent film prior to cure, thereby providing ease of engagement with mating parts prior to formation of the final seal
  • the lubricious agent employed in the present invention may be selected from polyethylene, polytetrafluoroethylene, talc, graphite, boron nitride, perfluoropolyethers, tetraoximino silanes, and the like, waxy materials such as polyethylene and polypropylene waxes, and liquid materials such as polybutene, hydrogenated polybutene, polydimethylsiloxane, and the like
  • the lubricious agents may be inert or unreactive particles which serve to provide lubricity to an otherwise substantially non-lubricious surface
  • the lubricious agents may alternatively be reactive with each other or other components of the composition Regardless of the type of lubricious agent, a sufficient amount of lubricious agent is incorporated into the sealant composition to impart surface lubricity and lower the coefficient of friction of the curable resin component per se
  • a method of imparting surface lubricity to an article that includes providing a lubricious sealant composition to the surface of the article
  • the sealant composition includes a heat curable component, lubricious agent within the heat curable component and an initiator
  • an article having a resin component and a lubricious sealant composition therein
  • Figures 1 and 2 are graphs of frictional force measurements taken on various inventive and control compositions during the assembly of a rubber hose and a metal hose housing for an automobile.
  • the present invention relates to lubricious sealant compositions that have a lubricious agent capable of lowering the coefficient of friction of the surface on which it is to be applied.
  • inventive compositions have excellent lubricious and sealing properties not found in conventional sealants.
  • the uncured preapplied inventive composition advantageously maintains its full lubricious nature when the matable parts are joined. This enables articles coated with the inventive compositions to be installed with greater ease than articles coated with conventional lubricious and non-lubricious sealants.
  • the inventive sealant compositions cure upon the application of an appropriate amount of heat.
  • the inventive sealant composition cures the matable parts are bonded, creating a lasting seal.
  • the lubricious nature facilitates the fitting together of mated parts and the subsequent curing of the composition, thereby creating excellent adhesion between the mated parts.
  • the sealant compositions of the present invention are desirably applied to a hose, such as those used in the automotive industry, prior to fitting the hose to a hose housing with which it is to be mated.
  • the "preapplied" hose sealant composition may be cured prior to its application, it is desirably not cured prior to use of the hose.
  • the inventive sealant composition is desirably applied at a certain distance on the interior diameter of the hose and dried by air or mild heat that will not effect the curing of the composition.
  • the inventive compositions advantageously maintain their full lubricious nature as the matable parts are fitted together. Thus, an article to be formed from mated parts and sealed with the inventive composition may be more easily assembled despite a tight fit between the mated parts.
  • the inventive compositions are extremely stable, have a long shelf-life and have the further advantage of not requiring a separate curing step prior to shipping.
  • the inventive sealant compositions are desirably cured upon the application of an appropriate amount of heat.
  • the inventive sealant compositions are particularly useful in the automotive industry where the inventive sealant composition can be heat cured after fitting a hose onto a housing by the heat emitted from an engine during its normal activity and use. As the inventive lubricious sealant composition cures, the matable parts are bonded, creating a lasting seal. Once cured, the inventive sealant composition has enhanced sealing and adhesive properties between the mated parts.
  • the inventive sealant composition contains a heat curable component, a lubricious agent, and an initiator, such as an azo compound or a peroxyketal. Coating the inventive composition onto an article provides ease of assembly and lasting sealability after curing.
  • lubricious agent refers to any material added to a curable composition which imparts lubricity thereby lowering the coefficient of friction on the surface of the cured composition.
  • lubricity refers to a lower coefficient of friction, such as those values obtained with the inventive compositions, as compared to the composition without the lubricious agent.
  • the lubricious agent may be selected from a wide variety of materials.
  • the lubricious agent is desirably a particulate which can remain uniformly suspended in the composition or is a wax or liquid material, which can be uniformly mixed into or dissolved in the resin to impart lubricity to the surface of the composition or article once dried and cured.
  • lubricious agents suitable for use herein include, without limitation, solid particulates of polyethylene, polytetrafluoroethylene, talc, graphite, perfluoropolyethers, molybdenum disulfide, tungsten disulfide, calcium fluoride, graphite fluoride, polytetrafluorethylene fluorotelemers, and the like. Combinations of lubricious agents are also desirable. Boron nitride is one of the more desirable lubricious agents useful in the present invention.
  • useful waxy lubricious agents are polyethylene waxes and polypropylene waxes. Desirably, these waxes have a melting point range of 150°C-250°C, but waxes having melting point ranges outside of this may be useful depending on the intended application.
  • Useful liquid lubricious agents include polybutene, hydrogenated polybutene, and the like. These liquid lubricious agents desirably have an average molecular weight range of up to about 15,000, and a viscosity of about 4,000 to about 10,000 cPs.
  • compositions of the present invention may incorporate the lubricious agent in various ways.
  • the lubricating agent may be soluble or miscible with the heat curable component or it may be present as a suspension or emulsion in the heat curable component.
  • the lubricating agent is desirably incompatible with the heat curable component within which it is suspended.
  • the term "incompatible”, as used herein, refers to a substance which is not miscible with nor able to form a solution within its host, i.e., it will not dissolve when combined with the base composition. Accordingly, the lubricious agent should ordinarily be suspended in particulate form within the composition.
  • lubricious agent in distinct, separate components dispersed throughout the composition in such a way that the lubricious agent is in a non-continuous phase within the composition.
  • the lubricous agent particles are suspended in the composition and, when the latter is cured, become "locked" in place.
  • the lubricious agents may be inert or unreactive particles which serve to provide lubricity to an otherwise substantially non-lubricious resin surface. Alternatively, the lubricious agents may be reactive with other components of the composition. Regardless of the type of lubricious agent, a sufficient amount of lubricious agent is incorporated into the composition such that the lubricious agent is desirably made available to the surface of the coated article, in order to impart surface lubricity and lower the coefficient of friction of the article. In certain embodiments of the invention, it may be desirable to choose a lubricious agent which naturally blooms or migrates to the surface. This provides for initial and ongoing lubricity and lowering of the coefficient of friction.
  • the lubricious agent is suspended or otherwise incorporated within the composition in amounts sufficient to lower the coefficient of friction on the surface of the composition. These amounts range from about 0.1% to about 60% by weight of the total composition and desirably in amounts of about 5% to about 35% by weight of the total composition.
  • the lubricious agents can be selected such that they do not leave a film residue on the other surfaces in which they come in contact with. For example, if the cured compositions of the present invention are placed in frictional contact with a substrate, desirably no residue of the lubricous agent is left on the substrate.
  • the particle size will vary greatly depending on the type of lubricant. Generally, particle sizes of up to about 300 microns may be employed.
  • Boron nitride one highly desirable lubricious agent in the present invention, is a synthetic ceramic material, which offers high heat capacity and outstanding thermal conductivity, as well as lubricity. It is an inert, white material having a hexagonal, plate-like crystal structure resembling that of graphite. It is non-abrasive and unctuous to the touch. It is most commonly used in powder form. Particle size ranges of about 5 to about 44 microns are desirable.
  • PTFE polytetrafluorethylene
  • Teflon® Various fluoropolymers such as polytetrafluorethylene (PTFE), often commonly refe ⁇ ed to as Teflon®, are also suitable for use as the lubricious agent.
  • PTFE is a white granular fluoropolymer powder which is both chemically inert, and capable of imparting lubricious properties to the elastomeric compositions of the present invention.
  • PTFE is often mixed with inorganic fillers to selectively enhance its properties
  • Combinations of PTFE and other polymers such as polyethylene particulates are also contemplated as lubricious agents
  • fluoroadditive powders such as Zonyl ® are useful as the lubricious component in the present invention
  • Zonyl ® is a registered trademark of the Dupont Company. It is a small particle powder especially suitable for improving the lubriciousness of coatings. It has an average agglomerate size of 1 8 to 4 ⁇ m
  • oils and waxy particles having the general formula F[CF(CF3)CF 2 0] n CF 2 CF 3 , and sold under the trademark Krytox®, are among those useful These materials are non-flammable and extremely stable lubricants with a host of high- performance applications These materials are available in a variety of molecular weights which dictate their physical state as an oil or waxy material These materials are desirable because they are chemically inert, nonflammable, thermally stable, and offer outstanding lubricity
  • the heat curable component of the present invention desirably cures when subjected to the heat emitted by the engine of the automobile
  • the heat curable component will desirably cure at a temperature that is less than the normal operating temperature of an engine of an automobile and greater than room temperature
  • the heat curable components are generally employed in amounts of about 40% to about 95% by weight of the total composition Desirably, they are used in amounts of about 55% to about 90% by weight.
  • Silicone rubber and liquid compositions exist in various forms as characterized by their differing cure chemistry, viscosity, polymer type, and purity They can be formulated into one-part or two- part systems and a particular silicone composition can be engineered to be cured by more than one mechanism.
  • Moisture-curing mechanisms, heat-curing mechanisms, and photo initiating mechanisms are among the means used to initiate cure, i e , cross-linking of reactive silicones. These mechanisms are based on either condensation reactions, whereby moisture hydrolyzes certain groups on the silicone backbone, or addition reactions which can be initiated by a form of energy, such as electromagnetic radiation or heat.
  • reactive polyorganosiloxanes can be cured by heat in the presence of a peroxide.
  • these reactive compounds can also be cured by heat in the presence of silicone hydride-containing (- SiH) compound and a metallic hydrosilation catalyst, such as an organo-platinum catalyst.
  • the most desired elastomeric silicone resins for use in the present invention include oxime-curable silanol compositions.
  • the silicone resins may be heat-curable, room temperature curable, UV curable, moisture curable, or capable of curing by more than one of these mechanisms.
  • Latex resins i.e. water-based emulsions or dispersions
  • aqueous acrylic emulsions such as those commercially available from Union Carbide under the trade name UCAR®.
  • Polyurethane resins useful in the present invention include urethane-acrylate emulsions, such as aliphatic urethane-acrylate emulsions. These polyurethane resins may be combined with a reactive diluent monomer and an initiator.
  • a lubricious surface is still obtainable due to the incorporation of the lubricious agent.
  • Other useful heat curable components which may be used alone or in conjunction with latex materials may be selected from a wide variety of materials which when cured will benefit from the presence of the lubricious agent.
  • the more desirable heat curable components include elastomeric and flexible plastic resins, such as silicone resins, polyurethane resins, latex resins, polyester resins, acrylic resins, polybutadiene resins, ethylene-propylene-diamine monomers (EPDM), polyisoprene rubber resins, polysulfide rubber resins, and styrene- butadiene copolymers, polydisulfide rubbers and the like. These resins generally do not exhibit a lubricious surface when dried or cured. Like most rubbery materials, these resins tend to create slip-resistant surfaces rather than lubricious ones.
  • the initiator used in the inventive composition acts to cure or catalyze the cure of the composition.
  • the initiator is a metal insensitive initiator.
  • Useful initiators include amines, peroxides, and the like and are generally incorporated in amounts of about 0.1% to about 0%) by weight of the total composition.
  • Useful peroxy compounds include the peroxides (organic as well as inorganic), hydro peroxides and peresters, including, for example, cumene hydroperoxide, t-butyl hydroperoxide, methyl ethyl ketone hydroperoxide, t- butyl perbenzoate and benzoyl peroxide.
  • initiators which may be employed include peroxyketals and azo initiators, such as those available from DuPont under the Vazo trademark, azo-bis-isobutyronitrile, N-methyl diethanol-amine benzophenone, chlorothioxanthone, diethoxyxanthone, benzoin isopropyl ether, benzoin methyl ether, benzophenone and diethoxy acetophenone.
  • Particularly useful initiators include 2,2'-azobis[2- methyl-N-(2-hydroxy)propionamide],azobis-2-methylbutyro nitrile and combinations thereof.
  • the sealant composition is applied to an article and air dried or dried by applying mild heat, which is desirably insufficient to effect the curing of the composition.
  • the article with the dried sealant composition thereon or therein can be shipped in this state.
  • the article coated with the inventive sealant adhesive composition has good stability and shelf-life.
  • the coated article is used by fitting the article, such as an automotive hose, onto the mated housing.
  • the inventive lubricious sealant provides lubrication to the fitted parts and allows the coated hose to be easily fitted onto the housing.
  • Articles having the inventive lubricious sealant thereon or therein can be assembled with other component parts without debraiding that may be caused by the frictional forces of assembly that may otherwise compromise the seal.
  • inventive composition can be applied to the housing of the mated part instead of on the hose. It is possible to use the inventive lubricious sealant compositions on metal couplings such as aluminum housings for rubber hoses.
  • inventive lubricious sealant compositions on metal couplings such as aluminum housings for rubber hoses.
  • the compositions of the present invention may also be applied to or incorporated in numerous other substrates such as gaskets, o-ring seals, press-fit seals, or other similar fitted seals
  • the sealant compositions of the present invention may include suitable additives such as curing agents, catalysts, viscosity modifiers, dispersing agents, surfactants, anti-foamers, diluents, pigments, thickeners, adhesion promoters, and combinations thereof
  • suitable additives include polypropylene glycol based defoamer, polysiloxane in polyglycol, polyether modified polydimethylsiloxane, N, N-dimethylacrylamide, dibutylphthalate, ethoxylated trimethylol propane triacrylate, and combinations thereof
  • suitable additives such as curing agents, catalysts, viscosity modifiers, dispersing agents, surfactants, anti-foamers, diluents, pigments, thickeners, adhesion promoters, and combinations thereof
  • Useful additives include polypropylene glycol based defoamer, polysiloxane in polyglycol, polyether modified polydimethylsilox
  • the present invention also provides an article having a curable resin component and a lubricious sealant composition therein
  • the resin component may be curable by any means such as moisture curing, heat curing and photo initiating mechanisms In this embodiment a dual or multi-curing mechanism is contemplated
  • compositions as set forth in Table 1 below were prepared. Each of the compositions were prepared in a similar manner
  • the silicone resin compositions were first prepared as follows Silanol and silica were combined with aluminum pigment and calcium carbonate fillers, mixed and heated until the fillers were properly wetted The resulting combination was then heated in a vacuum at approximately 100°C and mixed for an additional two hours
  • compositions 1-15 are similar silicone compositions with various amounts and types of lubricious agents.
  • Compositions 1 and 13 are control samples and do not contain a lubricious agent.
  • Compositions 2-12, 14-16 represent lubricious compositions of the present invention.
  • Table 2 shows the results of average peak load upon assembly of aluminum hose housings using the compositions from Table 1
  • the compositions of Table 1 were cured in situ on the external diameter of the housing of a metal hose coupling, followed by assembly of a rubber hose onto the portion of the housing coated with the inventive compositions Insertional forces represented by peak load (lbs) was calculated by an Instron testing machine The surface area and thickness of the cured compositions were substantially the same for each of the tests The insertional force was measured as the hoses were fitted onto the aluminum housings The amount of work, i e , force exerted over a given distance, was subsequently calculated by plotting load force versus displacement in inches The area under each curve represented the work done The average work peak load (lbs ) and work done is shown in Table 2 The averages were obtained from seven test runs Sample tests were run with no lubricious agent or sealant composition, as is the standard industry practice A control composition 1 was run using a sealant composition substantially the same as the inventive lubricious sealant compositions, except without the
  • Table 3 shows Compositions 17-22 representative of the inventive lubricious compositions These compositions are aqueous acrylic latex emulsions containing various lubricious agents as shown The compositions were applied to the internal diameter of a hosing and cured The hosing was then fitted onto a metal housing and the "push-on" force required to couple the mating parts was measured on an Instron test machine As indicated in Figure 2, the assembly forces were generally significantly lower with the inventive compositions as compared to the control, which was the acrylic latex composition UCAR 123 without a lubricious agent incorporated therein Lower assembly forces are indicative of a reduction in the coefficient of friction of the cured resin composition
  • Figure 1 shows the results of testing performed on Compositions 10-16 Sample compositions 10-15 were applied to the external diameter of metal hose housings and cured The cured compositions represented approximately the same thickness and surface area for each test The housings were then coupled with a rubber hose by inserting the hose over the portion of the housing coated with the inventive compositions The frictional force to assemble the parts was then measured using an Instron machine The results, shown in Figure 1, generally indicate a reduction in the coefficient of friction of the inventive formulations
  • composition 16 was applied to the internal diameter of the rubber hose, as opposed to the external diameter of the metal hose housing This composition demonstrated the greatest reduction in frictional forces
  • the sample labeled "NS" in Figure 1 represents the force required to assemble the hose and housing without any sealant composition present
  • compositions as shown in Tables 4, 5 and 7, were prepared by combining the respective components and uniformly mixing them together
  • compositions were tested for their ability to act as lubricious adhesive sealant compositions Tests performed included a lap shear test and lubricity tests
  • compositions 23-24 were prepared according to procedure previously described and include an aqueous acrylic latex emulsion as the curable resin component, boron nitride as the lubricious agents and azobis-2-methylbutyro nitrile as the metal sensitive initiator
  • a control composition as shown in Table 4, that did not contain a lubricious agent was also prepared
  • the compositions in Table 4 were tested for lap shear strength by applying the composition to an EPDM substrate and allowed to air dry An aluminum substrate was clamped to the coated EPDM substrate and heat cured at 280°F for one hour Lap shear strength was tested using an Instron tensometer The lap shear substrate sample coated with composition 23 had better shear strength than lap shear substrate sample coated with composition 24 and did not break as easily.
  • the control composition which did not include a lubricious agent, had excellent lap shear strength, yet had poor lubricity. From the compositions of Table 4, it was determined that compositions with a lower lubricious agent concentration, had better
  • UCAR 625® is a registered trademark of Union Carbide for an acrylic latex emulsion.
  • compositions 25-42 are Compositions 25-42
  • Test specimens in which compositions in Table 5 and 7 were applied thereto, were prepared by assembling a one-half square inch EPDM substrate coated with air dried sealant composition onto a one-inch wide Alclad aluminum shear substrate The backside of the EPDM substrate was supported with a rigid aluminum plate and the assembly was clamped together with stationary-type binder clips The assembly was cured in a convection oven at 82°C for three days, cooled to room temperature and the clips and backer plates were removed The shear adhesion strength between the two substrates was measured using an Instron tensometer and recorded, as shown in Tables 5 and 7
  • the lubricious nature of the lubricious adhesive sealant composition was tested by evaluating the ease of assembly of two mated parts An Instron tensometer was used to measure the maximum force required to push a coated hose onto a housing and the total amount of energy required to push a coated hose into the housing
  • the test samples were prepared by applying the compositions in Tables 5 and 7 to an industry standard distance inside an EPDM automotive cooling system hose A thin film of the composition was applied to the hose by hand or a brush.
  • the coated tubes were allowed to air dry for about 12 hours The coated surfaces felt more slippery than the surface of the uncoated hoses
  • the compositions had approximately the same thickness and surface area for each test
  • the housings were then coupled with a rubber hose by inserting the hose over the portion of a housing coated with the inventive compositions
  • the maximum push-on force and total push-on energy measured are considered to be indicative of the lubricious nature of the composition and how well the composition will facilitate the fitting of a hose over a hose housing
  • a lower push-on force and push-on energy indicates a lower coefficient of friction and suggests that the mated parts will be more easily assembled and therefore reduce the risk of leakage passageways
  • compositions 25-42 include an urethane-acrylate emulsion as the curable resin component, 2,2-Azobis [2-methyl-N-(2-hydroxy) propionamide] as the metal insensitive initiator, boron nitride as the lubricious agent and the following additives, polypropyl glycol based defoamer and diethylene glycol monobutyl ether
  • the urethane-acrylate emulsion was used for preparing the compositions of Table 5 and 6 Varying amounts of the components, as shown in Table 2, were used to test the effect, if any, they had on the lubricious and adhesive properties of the composition Amounts of the additives had a negligible effect on the physical properties of the composition
  • higher amounts of the lubricious agent did not greatly reduce the maximum push-on force or total energy used in pushing the hose on the housing
  • higher amounts of the lubricous agent decreased the lap shear strength of the composition
  • compositions 43-58 were prepared by mixing the base emulsion, as shown in Table 7, with two different lubricous agents. The resulting compositions were tested for their lubricious and adhesive properties. Compositions 43 and 44 were control compositions and did not contain any lubricous agent. Compositions 43 and 44 made it evident that compositions without a lubricous agent required a higher maximum push-on force and total push- on energy, however, had excellent lap shear strength. Compositions containing high loads of a lubricous agent tended to have a lower maximum push-on force and total push-on energy values but a reduced lap shear strength.
  • 2 Zonyl ® is a registered trademark of Dupont (Wilmington, DE) and is a fluoro additive powder with an average agglomerate size of 1.8 to 4 ⁇ m.

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  • Chemical Kinetics & Catalysis (AREA)
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  • Polymers & Plastics (AREA)
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Abstract

L'invention concerne une composition de scellement glissante que l'on peut appliquer sur un article récepteur, laisser sécher et ensuite durcir au moyen de la chaleur ou d'autres mécanismes. Ladite composition de scellement comporte un composant durcissable qui est éventuellement thermodurcissable, et un agent de glissement incorporé de manière homogène à ladite composition. Les compositions de scellement glissantes facilitent l'adaptation de pièces à joindre et sont ensuite durcies, ce qui permet la création d'une liaison adhésive excellente entre lesdites pièces.
PCT/US2000/018555 1999-07-15 2000-07-05 Compositions de scellement glissantes WO2001005882A1 (fr)

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AU60753/00A AU6075300A (en) 1999-07-15 2000-07-05 Lubricious sealant compositions

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US14415799P 1999-07-15 1999-07-15
US60/144,157 1999-07-15
US20709000P 2000-05-25 2000-05-25
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007127792A2 (fr) * 2006-04-28 2007-11-08 St. Jude Medical, Atrial Fibrillation Division, Inc. Compositions polymériques autolubrifiantes biocompatibles et leur utilisation dans des dispositifs médicaux et chirurgicaux
DE102015222657A1 (de) * 2015-11-17 2016-05-04 Schaeffler Technologies AG & Co. KG Wärmeleitfähige Elastomermischung mit guten Gleiteigenschaften und Dichtung aus einer derartigen Elastomermischung

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