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
  • 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
  • C09J123/26—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 modified by chemical after-treatment
  • C09J123/36—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 modified by chemical after-treatment by reaction with compounds containing nitrogen, e.g. by nitration
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
  • C09K3/1006—Materials in mouldable or extrudable form for sealing or packing joints or covers characterised by the chemical nature of one of its constituents
  • C09K3/1021—Polyurethanes or derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/08—Processes
  • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• • 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
  • C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on 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
  • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
  • C09J175/04—Polyurethanes
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B39/00—Locking of screws, bolts or nuts
  • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
  • F16B39/021—Locking of screws, bolts or nuts in which the locking takes place after screwing down by injecting a settable material after the screwing down
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B39/00—Locking of screws, bolts or nuts
  • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
  • F16B39/225—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of a settable material
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G2190/00—Compositions for sealing or packing joints

Definitions

• the present invention relates to curable adhesive and sealant compositions in a dry-to-the-touch form. More particularly, the present invention relates to dry-to-the-touch adhesive and sealant compositions which incorporate a modified methylene diisocyanate prepolymer to provide moisture curing compositions which are particularly useful in threadlocking and sealing applications and may include various product forms including dry-to- the-touch tapes and gaskets.
• threaded mechanical fasteners such as nut/bolt assemblies
• an adhesive/sealant composition termed a threadlocking composition, for the purpose of locking and/or sealing the constituent members of such fasteners when they are threadingly engaged.
• Threadlocking compositions known in the art include co-reactive adhesive systems. With this type of threadlocking system, two or more components are mixed before applying the resulting composition to the threaded engagement surface(s) of the fastener on which the components in the threadlocking composition react to cure. Examples of such co- reactive systems include epoxy resin adhesive compositions.
• Liquid adhesive compositions have long been used in sealing and threadlocking applications and have become a standard part of assembly production as well as in the maintenance of machinery, tools and the like. Among the liquid adhesive compositions commonly used in these applications are anaerobic compositions. These single part compositions provide excellent threadlocking and sealant properties and remain stable until they are placed between parts where they cure in the absence of air. Moreover, these compositions remain stable for long periods of time during storage in the bottle.
• the present invention relates to compositions useful for adhesively fixturing matably engageable structural elements, such as threadlocking or bolt/nut assemblies or retaining applications, so that the structural elements are adhesively bonded and sealed upon their being engaged in a final interlocked state.
• the present invention broadly relates to a reactive adhesive/sealant composition, having particular utility for threadlocking matably engageable surfaces of threaded mechanical fasteners, or adhesive bonding of other matably engageable structural elements.
• moisture curing compositions which employ modified methylene diisocyanate polymers (modified MDI) having an NCO content of about 8% to 18% produce dry-to-the-touch sealants and adhesives having improved break/prevail strength within 48-72 hours cure time at room temperature, as well as improved break/prevail strength at high temperature (120°).
• modified MDI modified methylene diisocyanate polymers
• a method of curing mated threaded parts including the steps of: (a) providing a composition including (i) a moisture curable polymer having an NCO content of about 8% to 18%, and more desirably about 16% to 18% by weight of the polymer; (ii) a moisture curable catalyst; and (iii) a reinforcement filler; (b) applying the composition to a threaded part; (c) mating the threaded part with another threaded part; and (d) permitting the composition to moisture cure.
• the moisture curable polymer is an MDI polymer which has been modified with polyester and/or poly ether units, e.g. a polyester or polyether backbone.
• a moisture curable threadlocking composition including: (a) a polyester or polyether modified methylene diisocyanate polymer present in amounts of about 30% to about 95% and having an NCO content of about 8% to 18%, and more desirably about 16% to 18% by weight of the polymer; (b) a moisture cure catalyst; and (c) a reinforcement filler; wherein the composition provides a break/prevail strength of at least about 100/10 in-lb after about 4 to about 8 hours of cure.
• a threaded assembly including: (a) a male threaded part matingly assembly with a female threaded part; (b) a threadlocking composition including: (i) a moisture curable modified MDI polymer having an NCO content of about 8% to 18%, and more desirably about 16% to 18% by weight of the polymer; (ii) a moisture curable catalyst; and (iii) a reinforcement filler.
• sealant compositions of the present invention have been shown to be especially effective in curing both "inside” and “outside” the bond line of the mating parts.
• the term “inside” the bond line refers to the mated area not exposed to air, and the term “outside” the bond line refers to the area not within the mated connection.
• the inventive compositions have been shown to have especially beneficial properties, such as being surface insensitive, dry to the touch, nonextractable in water and solvent, and providing the ability to a large cure through a large cure through gap (CTG) from about 0 .05 mm to about 10.0 mm.
• CCG large cure through gap
• compositions of the present invention broadly relate to a reactive adhesive/sealant composition, having utility for threadlocking matable engagement surfaces of threaded mechanical fasteners, or adhesive bonding of other matably engageable structural elements.
• Compositions of the present invention in general, include a moisture curable modified (MDI) polymer (or pre- polymer) having an NCO content of about 8% to 18% by weight of the polymer, a moisture curable catalyst and a reinforcement filler.
• the NCO content is a residual content from the reaction by which it was made.
• the moisture curable polymer is a polyester modified MDI.
• Such polymers may provide cured polymers having polyester/urethane backbones.
• compositions may be present in the polymers provided they contain the reacted residual NCO content and permit dry-to-the-touch moisture cure. Desirably, the compositions provide break/prevail properties in the range of about 90/10 to about 300/10 inch-pounds (in-lbs) within a 4-72 hour cure time at room temperature.
• the modified MDI is a polyether modified MDI.
• Such polymers may provide cured polymers having polyether/urethane backbones.
• the compositions When used in threadlocking applications, the compositions have the advantage of being curable at areas between the parts, as well as areas of the bondline which are open to the air, i.e., not confined between the parts. This is a distinct advantage over traditional anaerobic threadlocking compositions, which are naturally inhibited from curing outside the bond line, i.e., open to the air.
• Suitable threadlocking applications include connections between nuts and bolts, gears, retaining rings, or other engageable parts.
• compositions of the present invention may also be useful in various other methods, such as in patching and/or sealing. Further, parts such as stand-alone gaskets may be made from the compositions, which can then be allowed to cure for later use.
• curing refers to a change in state, condition, and/or structure in a material, as well as, partial and complete curing.
• active surfaces indicates substrates or parts having iron or copper ions in them, such as steel, and which aid in curing of adhesive applied to their surface.
• active surfaces indicates substrates which do not have metal ions which aid in the cure of adhesive applied to their surfaces, such as zinc, stainless steel or plastic.
• Dry-to-the-touch means tack-free.
• the test to determine whether a composition has a tack- free, dry-to-the-touch property a cured surface of the composition is dusted with talcum powder. The surface is considered tack-free or dry-to-the-touch if the talcum powder can be removed by light rubbing without causing the surface to become dull.
• the term moisture curable "polymer” and "prepolymer” will be used interchangeably to mean a polymer which can be cured by moisture.
• the moisture curable polymer may have a variety of polymeric repeating groups or backbones, provided it has a residual NCO content in the range of about 8% to 18% by weight of the curable polymer and which allows for dry-to-the-touch cure outside of the bondline, i.e., in the open air.
• the polymeric backbone may be formed from a polyester, polyether or a polyester/polyether copolymer.
• the backbone may be formed from a polyurethane, polyurea or a polyurethane/polyurea copolymer.
• Various copolymers of polyurethane, polyester and polyethers may also be employed.
• the moisture curable polymer is a polyester/polyurethane polymer, or a polyether/polyurethane formed from the reaction of a modified diisocyanate isocyanate and an alcohol, with a sufficient amount of excess NCO groups present such that about 8% to about 18%, and more desirably about 16% to 18% of the total NCO groups initially present remain unreacted and available for moisture cure.
• useful modified diisocyanates include modified methylene diisocyanate (MDI) having polyester or polyether units.
• modified MDI provides the desired cure properties and dry-to-the-touch characteristics outside the bondline, whereas other diisocyanates such as modified toluene diisocyanate (TDI) and modified hexamethylene diisocyanate (HDI) do not produce adequate cure and dry-to-the-touch properties.
• TDI modified toluene diisocyanate
• HDI modified hexamethylene diisocyanate
• Examples of useful moisture curable polyurethanes include those compounds having a repeating unit such as -[0-CONH-X-NH-COOR 1 ]- n , where X is an aliphatic or aromatic hydrocarbyl or heterohydrocarbyl diradical group or chain and n is an integer from 1 to 25.
• R 1 is an alkylenyl or an arylenyl group.
• Polyurethanes having this formula desirably also include the residual NCO content as previously discussed.
• One particularly useful moisture curable polymer is a prepolymer sold under the trademark Rubinate 9511 MDI, Huntsman Corporation, Houston, Texas. This material is described by the manufacturer as a modified diphenylmethane diisocyanate prepolymer having a residual NCO content of about 16% by weight of the prepolymer with an average NCO functionality of 2.4.
• Other useful moisture curable polymers include a low viscosity MDI prepolymer sold under the trademark Suprasec 9568 MDI, Huntsman Corporation, Houston, Texas. This material is described by the manufacturer as being a modified diphenylmethane diisocyanate, which has an average NCO functionality of 2.4.
• Other useful moisture curable polymers include those sold under the trade names Desmodure E-23A, Rubinate 1234, Rubinate 9234 and Rubinate 9272.
• the prepolymer backbone material has a viscosity of about 1000 to about 4000 centipoise (cP) at 25°C (room temperature) and measured using spindle #20 at room temperature and most desirably has a viscosity of about 500 to about 25,000 cP at room temperature.
• the prepolymer backbone material desirably has a functionality of from about 2 to about 2.5, and most desirably about 2.4. Further, the prepolymer backbone desirably has an equivalent weight ranging from about 100 to about 400, desirably about 250 to about 270.
• the compositions of the present invention include residual isocyanate groups on the moisture curable polymer.
• the residual NCO groups may be the result of the particular isocyanate compounds used in formation of the backbone.
• the backbone may be formed from the reaction of an alcohol compound and an isocyanate compound.
• the residual NCO groups may result from an excess stochiometric amount of isocyanate compound such that unreacted NCO remains on the thus formed polyurethane backbone.
• the isocyanate groups may be added as pendent or end groups to a particular backbone.
• polystyrene backbones having residual NCO groups examples include polymeric polyisocyanates such as those conforming to the general structure:
• NCO-OCR-R-CH 2 (R-CH 2 ) n -R-NCO where R in each occurrence may be the same or different and may be a hydrocarbyl group or hetero hydrocarbyl group, wherein the hetero group may contain an oxygen, nitrogen or sulfur atom and n is 1-20.
• Moisture curing polyurethane or polyurea polymers having residual isocyanates in the present invention may also be formed from the reaction product of an isocyanate and at least one compound selected from a multifunctional alcohol, a polyamine, a polythiol, and combinations thereof.
• Examples of polyisocyanates useful in forming the moisture curable polymer include those corresponding to the formula:
• X is a substituted or unsubstituted Ci_2o hydrocarbon diradical or a heterhydrocarbon diradical, where the hetero atom may be O, N or S.
• X is an alkylene or an arylene group.
• Isocyanates useful for forming the moisture curing polymer include methylene diisocyanates such as 4,4 '-methylene diphenyl diisocyanate (MDI) and, 4,4'-diphenylene methane diisocyanate. It has been discovered that modified toluene diisocyanates and modified hexamethylene diisocyanates typically do not have the requisite NCO content and/or do not produce dry-to-the touch cured products in compositions of the present invention.
• MDI 4,4 '-methylene diphenyl diisocyanate
• 4'-diphenylene methane diisocyanate 4,4'-diphenylene methane diisocyanate
• Still other reactants useful for forming the moisture curable polymer include those obtained by reacting polyamines containing terminal, primary and secondary amine groups or polyhydric alcohols, for example, the alkane, cycloalkane, alkene and cycloalkene polyols such as glycerol, ethylene glycol, bisphenol-A, 4,4'-dihydroxy-phenyldimethylmethane-substituted bisphenol-A, and the like, with an excess of any of the above-described isocyanates.
• polyamines containing terminal, primary and secondary amine groups or polyhydric alcohols for example, the alkane, cycloalkane, alkene and cycloalkene polyols such as glycerol, ethylene glycol, bisphenol-A, 4,4'-dihydroxy-phenyldimethylmethane-substituted bisphenol-A, and the like, with an excess of any of the above-described isocyanates.
• Useful alcohols for forming the moisture curable polymer include, without limitation, polyethyl glycol ethers having 3-7 ethylene oxide repeating units and one end terminated with an ether or an ester, polyether alcohols, polyester alcohols, as well as alcohols based on polybutadiene.
• One particularly useful alcohol is 1,4-butanediol.
• Additional useful alcohols include, without limitation, castor oil, glycerin, polyethylene glycol, etherdiol, ethylene glycol, caprolactone polyols and combinations thereof.
• the adhesive compositions of the present invention are capable of curing in the presence of moisture at room temperature. Desirably, the compositions described herein are sufficiently cured at about 4 to about 8 hours after application. Further, the compositions described herein are fully cured after about 48 to about 72 hours, and are sufficiently stable to maintain an effective seal throughout the life of the threaded connection. Desirably, the cured composition has a break/prevail strength (inch-pounds) of from 100/10 to 300/100, depending on the particular material on which the composition is adhered and cured.
• the one-part moisture curable compositions described herein are surface insensitive, and thus are capable of being adhered and cured to various surfaces.
• the compositions may be adhered to metal substrates, such as steel, stainless steel, zinc, dichromate, cadmium, iron, and the like, or may be adhered to plastic or polymeric substrates.
• the inventive compositions include a moisture curing polymer component containing the requisite NCO content, the polymer being present in an amount of from about 30 to about 95% by weight of the total composition.
• compositions described herein include reinforcement fillers.
• reinforcement fillers may be selected from a wide variety of materials capable of providing reinforcement, including calcium carbonate, organic tin and zinc compounds and aluminum oxide, hydrated alumina and silica, etc.
• Other reinforcement properties can be achieved by adding carbon, glass, Kevlar and nano-organic or inorganic reinforcement materials.
• Such reinforcement fillers may be present in any useful amount, and desirably in an amount of from about 5 to about 50% by weight and desirably about 10% to about 30% by weight of the composition.
• compositions of the present invention may further include various additional components, such as viscosity modifiers, pigments and coloring agents, plasticizers, stabilizers, moisture scavengers, and other such additives in amounts suitable to achieve their intended purpose.
• the compositions may include other additives, such as latent amines, e.g., the commercially available product Hardener OZ (a latent aliphatic polyaminoalcohol based on polyurethane bisoxazolidine, sold by Bayer Material Science, Pittsburgh, PA).
• the latent amine may be present in an amount of from about 0.1 to about 10% by weight of the composition, and desirably about 0.1 to about 1.0% by weight of the composition.
• compositions described herein may include one or more "moisture scavengers" present in an amount of from about 0.1 to about 10.0% by weight of the composition.
• moisture scavengers include alkali metals, silicates, and molecular silols formed from such silicates.
• ortho-ester materials which can be added to remove water by a hydrolysis reaction.
• compositions described herein may additionally include one or more moisture cure catalysts.
• Useful moisture cure catalysts include metal salts typically selected from titanium, tin, zirconium, and combinations thereof.
• Suitable moisture cure catalysts include organo-metal catalysts including titanates, such as tetraisopropylorthotitanate and tetrabutoxyorthotitanate, as well as metal carboxylates such as dibutyltin laurate and dibutyltin dioctoate.
• Nonlimiting examples of moisture cure catalysts include, for example, dibutyltin dilaurate, dibutyltin diacetate, dibutyltin dioctoate, dibutyltin maleate, dialkyl tin hexoate, dioctyltin dilaurate, iron octanoate, zinc octanoate, lead octanoate, cobalt naphthenate, tetrapropyltitanate and tetrabutyltitanate.
• Other useful moisture cure catalysts such as those disclosed in U.S. Patent No. 4,111,890, may also be employed and are hereby incorporated by reference.
• the moisture cure catalysts if present, may be incorporated in any amount sufficient to effectuate cure and desirably from about 0.1 to about 10% by weight of the composition.
• additives include p-toluenesulphonyl isocyanate (a catalyst), and as well as a commercially available additive sold under the name BYK-500, (Byk-Chemie, Germany).
• compositions described herein may be used to adhere and/or seal various mating parts.
• a composition as described above is prepared. Two parts to be joined are provided, with one of the parts being designed to engage the other to form a connection.
• the prepared composition is applied to at least one of the parts, with the composition being applied at least partially on the area that will be either inside the bond line or outside the bond line, or both areas. The two areas are then mated together, and the composition is allowed to moisture cure.
• more than two parts may be connected together.
• the parts are threaded and include a male threaded part and a female threaded part, which are designed to be matably connected. In these embodiments, the composition may be applied to either the male part, the female part, or both.
• the composition may be allowed to cure for any desired length of time, and in some embodiments, the composition begins to develop cure strength in about 4 to about 8 hours. In some embodiments, the composition is allowed to cure for 24 hours, and in other embodiments the composition is allowed to cure for 48 to 72 hours.
• the composition is desirably cured at about room temperature, but the composition may be allowed to cure at higher or lower temperatures. As it cures, the composition becomes dry-to-the-touch at the areas of the mated parts that are exposed to the air (i.e., outside the bond line).
• the cured composition desirably has a break/prevail strength comparable to or higher than previous threadlocking compositions on active surfaces, and higher strengths on inactive surfaces.
• the cured composition desirably has a break/prevail strength of at least about 100/10 in-lb after 24 hours of curing at room temperature. After the composition is applied, the threaded parts are connected and the composition is allowed to cure, the resulting assembly exhibits superior strength, and can only be separated upon the exertion of a high level of force acted upon the threaded part(s). Areas at or outside of the bondline are dry-to-the-touch when cured. [0043]
• the compositions described herein may be better understood through the non- limiting Examples described below.
• Inventive thread locking compositions A-D were prepared and compared to two commercially available thread-locking compositions. Each of the compositions were tested on steel (stainless steel and zinc nuts and bolts) under various conditions as listed in the Table. Comparative data is shown below:
• the compositions were applied to nuts and bolts made from various materials, including stainless steel, zinc and plastic, in order to test for their ability to cure and provide threadlocking strength on different substrate surfaces (Substrate Sensitivity).
• the comparative anaerobic products were surface sensitive, meaning that the type of substrate, e.g., those substrates containing iron or copper ions (steel), as opposed to stainless steel, zinc or plastic surfaces, affected the ability to cure and develop strength.
• Anaerobic compositions are dependent on a redox reaction for cure and thus work better on surfaces containing iron or copper.
• the inventive compositions are not dependent on the substrate for their cure mechanism, and as such are substrate insensitive.
• compositions 1 and 2 were tested as to whether they were dry-to-the-touch at the bondline.
• compositions 1 and 2 were dry-to-the-touch at the bondline.
• inventive compositions all were dry-to-the-touch at the bondline.
• inventive compositions containing modified MDI polymers and having an NCO content available for moisture cure of about 8% to 18% exhibited dry-to-the-touch characteristics at or outside of the bondline, and a high break/prevail strength.
• inventive compositions provided more desirable threadlocking and sealant performances as compared to the formulations not using moisture curing polymers having the 8% to 18% residual NCO content.
• compositions outside of this NCO range exhibited either poor strength, poor reactivity (not cured) or both.
• compositions C, F and G were made from modified diisocyanate prepolymers which did not provide an NCO content in the range of 8% to 18% and did not result in sufficient moisture cure to provide adequate strength.
• polymers and prepolymers made from modified MDI and which have an NCO content of 8% to 18% performed well on the substrates tested and were dry-to-the-touch in open air once cured.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Health & Medical Sciences (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• General Chemical & Material Sciences (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Polyurethanes Or Polyureas (AREA)
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