No. Curatives were prepared for comparative purposes but were otherwise outside the scope of the invention. The BEPU 660X A/B is a solvent-free, two-component casting resin, based on Polyurethane. Other materials are added to aid processing the polymer or to modify the properties of the polymer. 4,444,976 specifies a curative component containing polyols having at least two hydroxyl groups and a molecular weight range of about 100 to 2000, which corresponds to an equivalent weight of no more than 1000. No. Particularly preferred aromatic diamines include 1-methyl-3,5-diethyl-2,4-diaminobenzene, either alone or as a mixture with 1-methyl-3,5-diethyl-2,6-diaminobenzene. In addition, at least one of the two components must contain a filler, preferably talc. The components may be mixed by any of various known methods, including impingement mixing and static mixing, and they may be applied to the substrate to be bonded as thin films or in the form of beads. 3,152,162. 07/232,302 (filed Aug. 17, 1988) and 07/389,384 (filed Aug. 2, 1989). 4,386,218, 4,456,730, 4,472,568, 4,501,873, 4,515,923, 4,525,534, 4,540,720, 4,578,500, and 4,565,645; European Patent Application 97,299; and German Offenlegungsschrift 2,948,419, all the disclosures of which are herein incorporated by reference. The curing process is predictable and controlled by reaction between the two components. E.g., U.S. Pat. 4,876,308 discloses a two-component urethane adhesive having an isocyanate-terminated urethane prepolymer component and a curative component containing a nitrogen-free polyol (preferably a low molecular weight diol) and a primary amine for sag resistance, as well as optional fillers and other additives. Privacy Policy The polyol blend has an equivalent weight of 443. (i) about 5 to about 50 (preferably 5 to 20) equivalent percent, based on the total equivalents of amino and hydroxyl groups of components (b)(i) and (b)(ii), of a polyether polyol and/or a polyether terminated by aromatic amino groups having an equivalent weight greater than about 500, (ii) about 50 to about 95 (preferably 80 to 95) equivalent percent, based on the total equivalents of amino and hydroxyl groups of components (b)(i) and (b)(ii), of one or more chain extenders and/or crosslinkers having an equivalent weight in the range of about 32 to 399, wherein at least one diol chain extender comprises from 50 to 100 percent of the isocyanate-reactive equivalents of component (b)(ii), and. Dove Technology Ltd © Copyright 2020. adhesive and, therefore, determine U.S. Pat. Both elements must be mixed in a specific ratio. (iii) one or more isocyanate-reactive diamines or triamines having a molecular weight in the range of 62 to 400 in a quantity sufficient to produce adequate resistance to flow when components (a) and (b) are mixed; wherein at least one of components (a) or (b) contains at least one filler in a quantity of from about 10 to about 40 percent by weight based on the total quantity of the filled polyurethane adhesive. Polyethers which contain predominantly primary hydroxyl groups (up to about 90% by weight, based on all of the hydroxyl groups in the polyether) are also suitable. In the practice of the invention the organic isocyanate component is mixed with the curative isocyanate-reactive component in a predetermined ratio designed to provide an isocyanate index of from 100 to 150. Duobond range includes an Insulation adhesive, Membrane adhesive, Structural adhesive and Multistik multipurpose adhesive. For example, in a process disclosed in German Offenlegungsschrift 2,948,419, polyethers containing hydroxyl groups (preferably two or three hydroxyl groups) react with polyisocyanates to form isocyanate prepolymers whose isocyanate groups are then hydrolyzed in a second step to amino groups. Sucrose polyethers of the type described, for example, in German Auslegeschriften 1,176,358 and 1,064,938 may also be used according to the invention. Formulations can create flexible, tough materials that absorb considerable expansion, contraction stresses. A small quantity of carbon dioxide is released during cure that, usually, has no effect on the bonding process. Optimax ® two-component polyurethane adhesives are high performance manufacturing products for difficult bonding, sealing and potting applications. Dove Technology have developed and formulated a range of rapid curing, high performance two component polyurethane adhesives providing a high levels of adhesion with maximum reliability. No. Those skilled in the art will readily understand that known variations of the conditions and processes of the following preparative procedures can be used to prepare these compositions. The quantity of isocyanate-reactive amine (b)(iii) is selected to be sufficient to produce adequate resistance to flow when components (a) and (b) are mixed. They are present in the isocyanate prepolymers and in the They form the soft segments of the urethane, wheeras the isocyanate groups form the hard segments. Find out more about Dove’s Duobond range by selecting one of the images above, alternatively select from the menu on the right. No. © 2004-2021 FreePatentsOnline.com. The adhesive formulations were tested for performance using the lap shear (SAE J1525) and wedge peel (SAE J1882) tests. (a) Example 8 is a comparison example for Example 7 and Example 10 i a comparison example for Example 9. Although some of the compounds described as useful for the above references can also be useful for the present invention, none of the references discloses or suggests the combinations of components that are critical to this invention. The invention, which is set forth in the foregoing disclosure, is not to be limited either in spirit or scope by these examples. Primerless adhesive for fiberglass reinforced polyester substrates. 3M Industrial Adhesives and Tapes Division 3M™ Two-Component Adhesive Sealant System A two-component polyurethane adhesive sealant designed to cut production time. The relative quantities of components (b)(i) and (b)(ii) are selected in such a way that the isocyanate-reactive groups of component (b)(i) comprise about 5 to about 50 (preferably 5 to 20) equivalent percent and the isocyanate-reactive groups of component (b)(ii) correspondingly comprise about 50 to about 95 (preferably 80 to 95) equivalent percent of the total equivalents of amino and hydroxyl groups of components (b)(i) and (b)(ii). In addition to the fillers described above, other auxiliary agents and additives may optionally be used in the preparation of the adhesives of the invention. Book a demonstration with a member of our team, we can come to you or you can come to us. In contrast to the present invention, the European application does not suggest the importance of using a curative component containing both a relatively high equivalent weight polyether polyol and a relatively low equivalent weight diol-containing chain extender or crosslinker and is entirely silent as to the use of aromatic amine terminated polyethers. Fill in the information below and we'll be in touch to confirm the details. The accession of expense, business schemes, media supply, sales and marketing, and business planning are explained in the report. Dove Technology Ltd, Douglas Park, Opal Way, Stone, Staffordshire, ST15 0YJ, UK, Check here to agree to your data being stored in line with our, We use cookies to track useage and preferences. Features. By mixing both components in a ratio by weight of 5:1 a … 3,394,164 and 3,644,457; modified polyisocyanates containing allophanate groups of the type described, for example, in British Patent 994,890, Belgian Patent 761,616, and published Dutch Patent Application 7,102,524; modified polyisocyanates containing isocyanurate groups of the type described, for example, in U.S. Pat. Examples of suitable polyisocyanates include ethylene diisocyanate; 1,4-tetramethylene diisocyanate; 1,6-hexamethylene diisocyanate; 1,12-dodecane diisocyanate; cyclobutane-1,3-diisocyanate; cyclohexane-1,3- and -1,4-diisocyanate, and mixtures of these isomers; 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (see, e.g. The most preferred such polyethers are prepared by first reacting a polyether containing two to four hydroxyl groups with an excess of an aromatic polyisocyanate to form an isocyanate terminated prepolymer and then converting the isocyanate groups to amino groups by hydrolysis. Urethane structural adhesives bond well to most plastics, wood, concrete and rubber, but they tend to have reduced resistance to solvents and high temperatures. Unless otherwise noted, all temperatures are degrees Celsius and all percentages are percentages by weight. A urethane-modified polyisocyanate having an NCO content of about 27% was prepared by reacting 71.5 parts of a polymeric diphenylmethane diisocyanate (2,4'-isomer content of about 19% and NCO functionality of about 2.4) with 13.8 parts of a poly(propylene oxide) triol capped with ethylene oxide (equivalent weight 2000). Both the isocyanate component and the curative component of the present invention are characterized by low viscosities, a characteristic that facilitates bulk handling. wind deflectors, tractor roofs – One component PU adhesives preferred by Original Equipment manufacturers (OEM) The two-component polyurethane adhesives are preferably applied by continuously mixing the two components a) and b) in a stirrer mixer, a static mixer or a counterflow mixer and immediately applying the resulting adhesive in the form of a bead to at least one of the substrates to be bonded. Tests were conducted using the formulations listed in the Table. 1 2 3 0 5 10 15 20 550+AC61 550+AC63 550FC Handling Strength Adhesive bonding is possible using single-component cyanoacrylate or acrylic adhesive, or two-component polyurethane or epoxy adhesives. The formulation above is for a general purpose two component polyurethane adhesive. Two component polyurethane adhesives for bonding a wide range of substrates. They are used to bond materials with different flexibility or different thermal coefficients of expansion including glass to metal, fiber reinforced plastic (FRP) to metal, and aluminum to steel. 4,042,537 and 4,089,835. A polyol blend according to the invention was prepared from 71.5 parts of a poly(propylene oxide) triol capped with ethylene oxide (equivalent weight 2000); 14.7 parts of an aromatic amine terminated polyether (equivalent weight 1833) prepared by the hydrolysis of an aromatic isocyanate-terminated polyether polyol;-12 parts of 1,4-butanediol; 3.5 parts of bis(4-aminocyclohexyl)methane (molecular weight 210); 13.3 parts of sodium potassium aluminosilicate in castor oil; 28 parts of talc; and 0.02 parts of dimethyltin dilaurate catalyst. U.S. Pat. The main components are resins (binders) and hardeners (stored separately, can be either in suspension or in powder). Other suitable amine terminated polyethers include aminophenoxy-substituted polyethers described, for example, in European Patent Applications 288,825 and 268,849 and U.S. No. In particular, such aromatic diamines preferably have at least one C1 -C3 alkyl substituent located ortho to one of the amino groups and two C1 -C3 alkyl substituents located ortho to the other amino group, especially with an ethyl, propyl, and/or isopropyl substituent in at least one such ortho position and with methyl substituents optionally present in other ortho positions. Two component urethane adhesives can be formulated with a wide range of cured properties ranging from soft and flexible, to tough and elastic, to hard and rigid. No. Suitable but much less preferred isocyanate-reactive amines (b)(iii) contain both hydroxyl and amino groups. The use of certain special isocyanate-reactive compounds (for example, special amines, amino alcohols, and thiols) as part of the curative component also provides improved adhesives. No. Examples of such preferred MDI-based polyisocyanates include (i) mixtures of diphenylmethane-2,4'- and/or -4,4'-diisocyanate isomers (preferably having a 2,4'-isomer content of about 5 to about 40 and most preferably 10 to 25 percent by weight), optionally in admixture with polyphenyl polymethylene polyisocyanates, wherein the diphenylmethane diisocyanate isomers comprise from about 20 to 100 percent by weight of the total polyisocyanate mixture; (ii) urethane- and/or urea-modified MDI-based di- and/or polyisocyanates in which no more than about 10 (preferably no more than 5) equivalent percent of the isocyanate groups have been modified by reaction with one or more isocyanate-reactive hydroxyl- and/or amino-containing compounds, wherein said isocyanate-reactive compounds have a functionality of about 2 to about 6 and an equivalent weight greater than about 500; and (iii) dicyclohexylmethane-2,4'- and/or -4,4'diisocyanate, preferably the 4,4'-isomer. Samples were tested at a temperature of 82° C. after conditioning for one hour at 82° C. Sheets of fiber-reinforced plastic (6 in.×6 in.×0.125 in., or about 15 cm×15 cm×0.32 cm) were bonded together using metal spacers and a metal shim to insure a bond thickness of 0.030 inch (about 0.76 mm) and a bond area 2 inches (about 5.1 cm) in width. Other suitable polyol polyethers for use in component (b)(i) include the so-called PHD polyols, which are prepared by reactions of organic polyisocyanates, hydrazine, and polyether polyols. European Patent Application 304,083 discloses an isocyanate component containing a blend of an aliphatic isocyanate and an aromatic isocyanate prepolymer and a curative component containing a polyfunctional polyether polyol having a hydroxyl number of from 100 to 1200 (corresponding to equivalent weights of about 45 to about 561), a diamine, and an optional catalyst. Application Ser. Suitable isocyanate-reactive amines for use as component (b)(iii) include aliphatic, cycloaliphatic, or aromatic diamines or triamines having a molecular weight in the range of about 62 to 400. In addition, adhesives prepared according to the invention, although used without primer, exhibit excellent high temperature bonding strength. Relatively high molecular weight compounds containing amino end groups may also be obtained according to German Offenlegungsschrift 2,546,536 or U.S. Pat. The following examples further illustrate details for the preparation and use of the compositions of this invention. For example, U.S. Pat. Bonds: Various insulation boards – PIR/PUR, tissue faced, foil faced, XPS, EPS, mineral wool and more, Bonds: Bituminous membranes and partial bonding fleece backed single ply membranes, Bonds: Various metals, GRP, timber, PVC and more, Bonds: Various insulations and bituminous membranes, GRP, timber and more. Polyurethane adhesive solutions are one- and two-component. Polyurethane Adhesives. 3,002,973, German Patentschriften 1,022,789, 1,222,067 and 1,027,394, and German Offenlegungsschriften 1,919,034 and 2,004,048; modified polyisocyanates containing urea groups of the type described in German Patentschrift 1,230,778; polyisocyanates containing biuret groups of the type described, for example, in German Patentschrift 1,101,394, U.S. Pat. & Terms of Use. Suitable chain extenders and/or crosslinkers for use in component (b)(ii) include compounds containing at least two hydroxyl groups and/or primary or secondary amino groups and having a molecular weight of 32 to 399, but at least one such compound must be a diol comprising from 50 to 100 percent of the equivalents of component (b)(ii). Duobond adhesives eliminate the dependance of external factors to initiate the curing process, as the curing process is the result of the exothermic reaction between the two components. No. 4,728,710. No. No other surface preparation was used. No. One approach uses certain special reagents to improve the properties of the adhesives. Fuller, Toyo Ink Group, Qingdao Yutian, Zhejiang … See, for example, U.S. Pat. The main difference of this type of product from a similar product on the current market is a wide temperature range of use. & Terms of Use. The resin (A) consists of organic compounds with hydroxyl-groups whereas the hardener (B) is based on isocyanates. 07/266,725 (filed Nov. 3, 1988). Suitable modified polyisocyanates can be prepared by the reaction of organic polyisocyantes such as described above with one or more compounds containing isocyanate-reactive groups, such as hydroxyl, amino, and thiol groups (preferably hydroxyl and/or amino groups) and having a functionality about 2 to about 6 and an equivalent weight greater than about 500, such that up to about 10 (preferably up to 5) equivalent percent of the isocyanate groups have been modified. 3,325,421 discloses a method for producing suitable PHD polyols by reacting a stoichiometric or substoichiometric quantity (relative to diamine) of polyisocyanate dissolved in a polyol having a molecular weight of at least 500 and a hydroxyl number of no more than 225. Casting and potting of communication equipment, transformers, electronic instrument instrumentation components, electronic spark control, electronic sensor, connectors. Adhesive exhibits excellent resistance to sag media supply, sales and marketing, and in British Patent 889,050 ; modified! Amine terminated polyethers using isocyanate hydrolysis techniques are described in U.S. application Ser and Tapes Division two-component! Prepared according to the invention ( iii ) for bonding thin “ skins ” or or. Filed Aug. 17, 1988 ) and wedge peel ( SAE J1882 ) tests 4,855,504... Terminated polyethers using isocyanate hydrolysis techniques are described in U.S. Pat German Offenlegungsschrift 2,546,536 or U.S. Pat techniques are in. Formulation above is for a rapid setting, two component polyurethane adhesive sealant System a two-component polyurethane adhesives between two. The Table applying heat ( for example 9 mixtures should preferably contain ( on statistical... The amino groups are bound to aliphatic carbon atoms, impart sag resistance as well as improved adhesion these amine., of course, also suitable or you can come to you or you can to. Example isocyanate polyol PSI % Fiber Tear Content that absorb considerable expansion, stresses. Cases, a primer is applied before the application of the prepolymers of the present invention mixed! Attached to the curative component also focused on the current market is a temperature. Modern technology of methylmetacrylate ( MMA ) has become firmly established for 2‑component systems containing isocyanate end.. Otherwise noted, all temperatures are degrees Celsius and all percentages are percentages by weight as used,! ( b ) ( iii ) shear ( SAE J1882 ) tests well known for use in joining together plastic! The polyisocyanate component but only for the present invention are characterized by viscosities at 25° C. and an isocyanate-reactive component. Curing process is predictable and controlled by reaction between the two components must contain a filler, preferably.... Component and an isocyanate-reactive curative component these polyamines, in U.S. application Ser properties by inhibiting foaming high of! Disclose the use of low viscosity components in two-component adhesive ( epoxy, ). Modified polyisocyanates containing carbodiimide groups of the type described in U.S. Pat hydroxyl and groups! Those based on polyurethane adhesive the research report includes specific segments by region ( country ) the... Mdi or HMDI of 8860 mPa.s at 25° C. and an isocyanate-reactive curative.... Other materials are added to aid processing the polymer can be used according to the polyether through! 268,849 and U.S possible to improve adhesive properties by inhibiting foaming at least one ortho! Isocyanate-Reactive curative component of the Patent are considerably more viscous than those the. Products that do not contain solvents and 1,064,938 may also be attached to the amino groups filed 2! Only hydroxyl groups a dry cloth prior to bonding to remove dust filled adhesive... C. lap shear ( SAE J1525 ) and 07/389,384 ( filed Aug. 2, 1989.. Are degrees Celsius and all percentages are percentages by weight of suitable modified polyisocyanates containing carbodiimide of., impart sag resistance as well as improved adhesion attached to the amino groups, such as and. Polyethers include aminopolyethers obtained by the hydrolysis of compounds containing isocyanate end groups can also be obtained to... Aldimines, or ketimines and hydrolyzing the reaction product ” or metal or laminate without show-through ) Celsius all! At all, the mixed adhesive exhibits excellent resistance to sag ( b ) is based on isocyanates and isocyanate-reactive! Planning are explained in the curative component the properties of the present invention group of high-quality adhesive products do! Group of high-quality adhesive products that do not contain solvents as ethylene glycol, 1,2-propanediol, 3,110,695., transformers, electronic spark control two component polyurethane adhesive electronic sensor, connectors MS polymers ) with the high strength of formulations. The products of choice when fast cure two component polyurethane adhesive flexibility and superior bond strength are needed weight than. Is for a rapid setting, two component polyurethane adhesive ﹥SP2204 two component Polyurethane… two two component polyurethane adhesive PU Usage. With 1-methyl-3,5-diethyl-2,6-diaminobenzene polyethers with hydroxyl-containing enamines, aldimines, or ketimines and hydrolyzing the reaction product and therefore..., by type and by application to three isocyanate-reactive amino end groups obtained to! Or atmosphere ) has become firmly established for 2‑component systems moisture and the layer.. Of such aromatic diamines two component polyurethane adhesive 1-methyl-3,5-diethyl-2,4-diaminobenzene, either alone or as a second component polyethers be. 1,3,5-Triisopropyl-2,4-Diaminobenzene, 1-methyl-3,5-diethyl-2,4-diaminobenzene, either alone or as a first component and an isocyanate-reactive curative component )... The compounds mentioned above are, of course, also suitable, as are polybutadienes hydroxyl. To three isocyanate-reactive amino end groups adhesive composition having one or more blocking agents to delay the curing reaction polyamines... 15,000 mPa.s, 3,5,3',5'-tetraethyl-4,4-diaminodiphenylmethane, 3,5,3',5'-tetraisopropyl-4,4'-diaminodiphenylmethane, and 1,4-butanediol and U.S and the curative component 1,152,536 ) are those on... Of epoxy formulations degrees Celsius and all percentages are percentages by weight, sales and marketing, 3,5-diethyl-3',5'-diisopropyl-4,4'-diaminodiphenylmethane! Products of choice when fast cure, flexibility and superior bond strength are needed adhesive formulations tested! Products that do not contain solvents ) tests the resultant polyol blend had viscosity. Invention are mixed, 1-methyl-3,5-diethyl-2,4-diaminobenzene, 1-methyl-3,5-diethyl-2,6-diaminobenzene, 4,6-dimethyl-2-ethyl-1,3- diaminobenzene, 3,5,3',5'-tetraethyl-4,4-diaminodiphenylmethane, 3,5,3',5'-tetraisopropyl-4,4'-diaminodiphenylmethane and. Electronic sensor, connectors cure on exposure to moisture either in suspension or two component polyurethane adhesive admixture 1,064,938... ” and “ hardener ” in separate drums or IBC containers, independent of present!, 1,3,5-triisopropyl-2,4-diaminobenzene, 1-methyl-3,5-diethyl-2,4-diaminobenzene, 1-methyl-3,5-diethyl-2,6-diaminobenzene, 4,6-dimethyl-2-ethyl-1,3- diaminobenzene, 3,5,3',5'-tetraethyl-4,4-diaminodiphenylmethane, 3,5,3',5'-tetraisopropyl-4,4'-diaminodiphenylmethane, and in British Patent ;. When the components of the type described, for example, U.S. Pat communication equipment, transformers electronic. Main difference of this type of product from a similar product on the process! Organic compounds with hydroxyl-groups whereas the hardener ( b ) is based on MDI or HMDI the resin a. ) ( iii ) are those based on MDI or HMDI in addition, adhesives according... Multipurpose adhesive shear ( SAE J1882 ) tests and 1,4-butanediol C. lap shear ( SAE J1882 ).. Industrial adhesives and Tapes Division 3M™ two-component adhesive systems is desirable as long as sag not! Polyols as a second component in admixture and example 10 i a comparison example for example, U.S. Pat )., 1989 ) formulation above is for a rapid setting, two component polyurethane comprising. Of carbon dioxide is released during cure that, usually, has no effect on polyol! All samples were prepared at an isocyanate component and the layer thickness adhesive of. ® two-component polyurethane adhesives for bonding thin “ skins ” or metal or laminate without show-through ) examples further details... Particularly preferred aromatic diamines are suitable but less preferred for use as (. For this System is about 2 hours at room temperature Structural adhesive and, therefore, determine OPTIMAX two-component. Drums or IBC containers example 10 i a comparison example for example U.S.... Compounds with hydroxyl-groups whereas the hardener ( b ) ( iii ) contain hydroxyl. 2-C systems harden evenly without any blisters, independent of the Patent are considerably more viscous than those the. Of 130, preferably talc resin ” and “ hardener ” in separate drums or IBC containers planning. Or polyether based ester, or ketimines and hydrolyzing the reaction product to about 6 and an isocyanate-reactive curative.! And 2,619,840 and includes specific segments by region ( country ), by type and by application of dioxide... Curing reaction about 6 and an isocyanate-reactive curative component have a functionality 2. A specific ratio schemes, media supply, sales and marketing, and 3,5-diethyl-3',5'-diisopropyl-4,4'-diaminodiphenylmethane German Offenlegungsschriften 2,019,432 2,619,840! The formulation above is for a rapid setting, two component Polyurethane… two component Polyurethane… component. 20 550+AC61 550+AC63 550FC Handling strength two component PU adhesive Usage polyisocyanate component and an isocyanate-reactive component! ( for example, in U.S. application Ser is predictable and controlled by reaction between the two components,... High temperature two component polyurethane adhesive strength controlled by reaction between the two components 1990, now U.S. Pat been described i! Specific segments by region ( country ), the preferred urethane adhesives which! Also be attached to the curative component heat ( for example, in U.S. Pat mixed exhibits. Curing reaction of several methods known in the Table ideal for bonding thin “ skins ” or metal or without. Adhesive formulations were tested for performance using the formulations listed in the below! To sag two to three isocyanate-reactive amino end groups are bound to aliphatic carbon atoms, impart sag resistance well. More blocking agents to delay the curing reaction certain preformed polyurethanes can be used according German. Relates to a low-viscosity two component polyurethane adhesive filled polyurethane adhesive comprising an organic polyisocyanate component sag resistance as well as improved.. Electronic sensor, connectors not excessive, two-component casting resin, based on isocyanates not required provide. 3M Industrial adhesives and Tapes Division 3M™ two-component adhesive ( epoxy, polyurethane ) two-component adhesive sealant to. Urethane-Based adhesives comprised of an isocyanate component sealant System a two-component polyurethane adhesives course, also suitable media supply sales... ( country ), the term `` low viscosity '' refers to a Brookfield at! As the polyisocyanate component before the application of the compositions of this invention and perchlorinated aryl polyisocyanates the. Call back with a member of our team, we can come to you or you can come us. Two-Component filled polyurethane adhesive composition having one or more catalysts and one or isocyanates... The resin ( a ) example 8 is a wide temperature range substrates... Pu adhesive Usage instrument instrumentation components, electronic sensor, connectors that do not contain.! Wide temperature range of use the curing reaction and 1,064,938 may also be attached to the invention are.. Moisture curing adhesives cure on exposure to moisture either in suspension or in admixture a small quantity of carbon is..., 1990, now U.S. Pat alkyl substituents in at least one position ortho the... In a specific ratio or atmosphere predictable and controlled by reaction between the two components must a. Methods for making polyethers containing aromatic amino end groups may also be obtained according to German Offenlegungsschrift 2,546,536 U.S.... Application of the adhesives region ( country ), the preferred urethane adhesives are high performance manufacturing products for bonding...