LOW-DENSITY HARDENABLE COMPOSITION

Description

Technical field

[0001] The invention relates to moisture-curing compositions with low density and their use as adhesives, sealants and coatings. State of the art

[0002] Moisture-curing compounds play a significant role in many technical applications, for example as one- or two-component adhesives, sealants, or coatings. Their curing is achieved through crosslinking reactions, which occur under the influence of water via free or latent reactive groups such as isocyanate or silane groups. These groups react with themselves or with each other upon contact with moisture, primarily from the air or as water in a second component, thus covalently linking the structural components contained in the compound to form a polymeric network.

[0003] Depending on the application, a very wide range of products with diverse individual properties can be formulated in the field of moisture-curing compositions. Additives, such as fillers, plasticizers, additives, and adhesion promoters, play a particularly important role, significantly influencing the formulation's properties, such as adhesion, mechanical properties, and processability. Most of these moisture-curing compositions have a relatively high density, usually in the range of 1.20 kg / L and above. This density is due, on the one hand, to the main components such as moisture-reactive polymers, plasticizers, and adhesion promoter additives, but the higher density above 1.00 kg / L is primarily due to fillers. Fillers are generally indispensable in such moisture-curing compositions.On the one hand, they significantly reduce formulation costs, and on the other hand, they make a major contribution to the mechanical and processing properties of the compounds. Unfortunately, common fillers such as chalk typically have a density of over 2.00 kg / L, which significantly increases the overall density of the compound. However, with the increasing trend towards lightweight construction and the need to reduce transport costs, the construction and industrial sectors are seeing a growing demand for low-density adhesives and sealants. Densities of 1.00 kg / L or even below are particularly desirable. To meet this need, microscopic hollow spheres have been used as additives in moisture-reactive compounds for some time now.These hollow spheres are essentially spherical, gas-filled particles with a diameter of no more than 500 µm and shells made of, for example, glass, silicates, or plastics. These microscopic hollow spheres have a density of sometimes well below 1.00 kg / L and, when mixed into moisture-curing compositions, can significantly reduce their resulting overall density. In addition to the low density, this also allows for advantageous properties such as thermal or acoustic insulation, which is desirable, for example, in vehicle manufacturing or floor adhesives. For instance, WO 2017 / 121540 A1 discloses a reactive polyurethane-based hot melt adhesive composition containing glass hollow spheres, which, at least in some embodiments, exhibits a reduced overall density as a result.

[0004] However, the use of such microscopic hollow spheres for density reduction also leads to significant disadvantages. In particular, mechanical properties such as elongation at break and especially tensile strength suffer considerably when using such microscopic hollow spheres. This is a particular problem for structural adhesives, where excellent mechanical properties are absolutely essential. To address this, large quantities of reinforcing carbon black have been incorporated as a filler. While this achieves acceptable mechanical properties and reduced density, the resulting compound becomes extremely thick and can only be applied using high-performance pumps or under heat. Furthermore, this method only produces deep black compounds, which cannot be colored and therefore have a very limited aesthetic range of applications.

[0005] The use of microscopic hollow spheres with polymer shells, marketed under the trade name Expancel, for example, is also widespread. While these are highly compatible with the other components of the composition, thus preserving the mechanics of the weight-reduced compositions to a certain extent, these hollow spheres are reversibly deformable under pressure, i.e., compressible. This leads to undesirable leakage of the composition from the application device when dispensing it, for example, from a cartridge, which is extremely unpleasant for the user. The addition of such microscopic hollow spheres with polymer shells, or even glass hollow spheres of a general type, to compositions based on silylated polyurethanes is taught, for example, in DE 10 2012 223422 A1, without, however, outlining any associated challenges or advantages.

[0006] In general, low-density, moisture-curing compositions containing microscopic hollow spheres exhibit poor pumpability, with the density often irreversibly increasing after pumping. Furthermore, most of these compositions have a reduced density that is unstable over time and irreversibly increases after prolonged storage. This can be attributed to factors such as the destruction of significant portions of the hollow spheres or the migration of substances into their cavities.

[0007] Therefore, there is still a need for a moisture-curing composition with a density of less than 1.20 kg / L, preferably less than 1.10 kg / L, and in particular less than 1.00 kg / L, which does not have the aforementioned disadvantages of the prior art and has improved mechanics, in particular tensile strength, good pumpability at low dispensing forces and a stable reduced density even after pumping and prolonged storage. Description of the invention

[0008] The object of the present invention is therefore to provide a moisture-curing composition with a density of less than 1.20 kg / L, preferably less than 1.10 kg / L, in particular less than 1.00 kg / L, which has improved tensile strength with good elongation at break, is easily applicable and pumpable at room temperature, whose density is not irreversibly and significantly increased by pumping or prolonged storage, and which does not produce any runoff during application.

[0009] This problem is solved in a surprising way by a moisture-curing composition as described in claim 1. By using an inorganic filler in combination with microscopic hollow spheres of a specific size and compressive strength and a defined quantity of all components of the composition, a low-density moisture-curing composition can be produced which fulfills the object of the present invention.

[0010] In preferred embodiments, both construction adhesives, for example for floors, and comparatively easy-to-apply structural adhesives or sealants with sound and heat insulation properties or fire-reducing properties can be produced.

[0011] Further aspects of the invention are the subject of further independent claims. Particularly preferred embodiments of the invention are the subject of dependent claims. Ways to implement the invention

[0012] The invention relates to a moisture-curing composition comprising a) at least one moisture-reactive polymer P with a proportion of 10 to 60 wt.%, based on the total composition, b) at least one inorganic filler F, with a proportion of at least 9 wt.%, based on the total composition, c) between 3 and 25 wt.%, based on the total composition, of at least one type of microscopic hollow spheres H, characterized by the fact that the composition has a density of less than 1.20 kg / L, preferably less than 1.10 kg / L, and the microscopic hollow spheres H exhibit a compressive strength, measured according to ASTM D3102-72, of at least 2.5 MPa, preferably at least 5 MPa, and the microscopic hollow spheres Hexhibit a volume-based particle size D90, measured with a Coulter counter, of less than 100 µm.

[0013] The term "silane group" refers to a silyl group bonded to an organic residue with one to three, particularly two or three, hydrolyzable substituents on the silicon atom. Particularly common hydrolyzable substituents are alkoxy groups. These silane groups are also called "alkoxysilane groups." Silane groups can also exist in partially or completely hydrolyzed form.

[0014] Organoalkoxysilanes are called "hydroxysilane", "isocyanatosilane", "aminosilane" or "mercaptosilane" if, in addition to the silane group, the organic residue has one or more hydroxyl, isocyanato, amino or mercapto groups.

[0015] Substance names beginning with "Poly", such as polyol or polyisocyanate, denote substances that formally contain two or more of the functional groups appearing in their name per molecule.

[0016] The term "organic polymer" encompasses a collective of chemically uniform macromolecules that differ in degree of polymerization, molar mass and chain length, which are produced by a polymerization reaction (polymerization, polyaddition, polycondensation) and have a majority of carbon atoms in the polymer backbone, as well as reaction products of such a collective of macromolecules.

[0017] The term "polyurethane polymer" encompasses all polymers produced using the so-called diisocyanate polyaddition process. This also includes polymers that are almost or entirely free of urethane groups. Examples of polyurethane polymers are polyether polyurethanes, polyester polyurethanes, polyether polyureas, polyureas, polyester polyureas, polyisocyanurates, and polycarbodiimides.

[0018] Silane-containing polymers include, on the one hand, silicone polymers (polydiorganosiloxane polymers) and, on the other hand, in particular, silane-containing organic polymers, which are commonly and, especially, in this document synonymously referred to as "silane-functional polymers," "silane-modified polymers" (SMP), or "silane-terminated polymers" (STP). Their crosslinking proceeds via the condensation of silanol groups to form siloxane bonds and is classically catalyzed by organotin compounds, such as, in particular, dialkyltin(IV) carboxylates.

[0019] The term "silane-containing polyether" also includes organic polymers containing silane groups, which, in addition to polyether units, may also contain urethane groups, urea groups, or thiourethane groups. Such silane-containing polyethers can also be referred to as "silane-containing polyurethanes."

[0020] In this document, "molecular weight" refers to the molar mass (in grams per mole) of a molecule or a part of a molecule, also called a "residue". "Mean molecular weight" refers to the number mean Mn of an oligomeric or polymeric mixture of molecules or residues, which is usually determined by gel permeation chromatography (GPC) against polystyrene as a standard.

[0021] A substance or composition is described as "storage-stable" or "storable" if it can be stored at room temperature in a suitable container for a longer period of time, typically at least 3 months up to 6 months or more, without its application or usage properties, in particular its viscosity and crosslinking rate, changing to an extent relevant to its use.

[0022] A dashed line in the formulas in this document represents the bond between a substituent and its corresponding molecular residue. "Room temperature" refers to a temperature of approximately 23°C.

[0023] All industry standards and norms mentioned in this document refer to the version valid at the time of the initial application.

[0024] The terms "mass" and "weight" are used synonymously in this document. Thus, a "weight percent" (wt%) refers to a percentage mass fraction which, unless otherwise stated, relates to the mass (weight) of the entire composition, or, depending on the context, to the entire molecule.

[0025] The moisture-curing composition within the meaning of this invention is in particular A polyurethane composition, in particular a two-component system that crosslinks through the reaction of polyols with isocyanates, as used, for example, in adhesives, coatings, potting compounds, sealants, molded parts, or block foams; or a one-component system with blocked (latent) isocyanate groups or blocked (latent) amino groups, as used, for example, in powder coatings, coil coatings, electrocoatings, or liquid coatings; or a composition based on silane-functional (silane-containing) polymers. Compositions based on silane-functional polymers cure rapidly even at relatively low catalyst concentrations and exhibit good adhesion to many substrates, even without the use of primers. They are also toxicologically advantageous due to the absence of isocyanates.

[0026] Therefore, they are suitable as moisture-reactive polymers. PFor the purposes of this invention, preferably polyurethane polymers PU with free or latent isocyanates as well as silane-functional polymers STP.

[0027] The composition according to the invention contains at least one moisture-reactive polymer. P with a proportion of 10 to 60 wt.%, preferably 15 to 50 wt.%, based on the total composition.

[0028] In one embodiment, the moisture-reactive polymer comprises P at least one polyurethane polymer PU with free or latent isocyanate groups. Polyurethane polymers containing isocyanate groups. PUFor the production of a composition according to the invention, polymers obtainable by reacting at least one polyol with at least one polyisocyanate, in particular a diisocyanate, are suitable, for example. This reaction can be carried out by reacting the polyol and the polyisocyanate using conventional methods, for example at temperatures of 50°C to 100°C, optionally with the use of suitable catalysts, wherein the polyisocyanate is dosed such that its isocyanate groups are present in stoichiometric excess relative to the hydroxyl groups of the polyol.

[0029] In particular, the excess of polyisocyanate is chosen such that, after the reaction of all hydroxyl groups of the polyol, the resulting polyurethane polymer retains a content of free isocyanate groups of 0.1 to 5 wt.%, preferably 0.2 to 3 wt.%, particularly preferably 0.3 to 2.5 wt.%, based on the total polymer.

[0030] If necessary, the polyurethane polymer PU are manufactured using plasticizers, whereby the plasticizers used do not contain groups reactive towards isocyanates.

[0031] Polyurethane polymers with the aforementioned content of free isocyanate groups are preferred, which are obtained from the reaction of diisocyanates with high molecular weight diols in an NCO:OH ratio of 1.3:1 to 4:1, in particular 1.5:1 to 3:1 and especially preferably 1.7:1 to 2.5:1.

[0032] Suitable polyols for the production of the polyurethane polymer containing isocyanate groups are in particular polyether polyols, styrene-acrylonitrile grafted polyether polyols, polyester polyols, polycarbonate polyols, poly(meth)acrylate polyols, polyhydroxy functional fats and oils or polyhydrocarbon polyols as well as mixtures of these polyols.

[0033] Polyether polyols, also called polyoxyalkylene polyols or oligoetherols, are particularly suitable if they are polymerization products of ethylene oxide, 1,2-propylene oxide, 1,2- or 2,3-butylene oxide, oxetane, tetrahydrofuran, or mixtures thereof, optionally polymerized with the aid of a starter molecule with two or more active hydrogen atoms such as water, ammonia, or compounds with several OH or NH groups such as 1,2-ethanediol, 1,2- and 1,3-propanediol, neopentyl glycol, diethylene glycol, triethylene glycol, the isomeric dipropylene glycols and tripropylene glycols, the isomeric butanediols, pentanediols, hexanediols, heptanediols, octanediols, nonanediols, decanediols, undecanediols, 1,3- and 1,4-cyclohexanedimethanol, bisphenol A. hydrogenated bisphenol A, 1,1,1-trimethylolethane, 1,1,1-trimethylolpropane, glycerin, aniline, and mixtures of the aforementioned compounds.Both polyoxyalkylene polyols with a low degree of unsaturation (measured according to ASTM D-2849-69 and expressed in milliequivalents of unsaturation per gram of polyol (mEq / g)), produced for example using so-called double metal cyanide complex catalysts (DMC catalysts), and polyoxyalkylene polyols with a higher degree of unsaturation, produced for example using anionic catalysts such as NaOH, KOH, CsOH or alkali alcoholates, can be used.

[0034] Polyoxyethylene polyols and polyoxypropylene polyols are particularly suitable, especially polyoxyethylene diols, polyoxypropylene diols, polyoxyethylene triols and polyoxypropylene triols.

[0035] Particularly suitable are polyoxyalkylene diols or polyoxyalkylene triols with a degree of unsaturation lower than 0.02 mEq / g and with a molecular weight in the range of 1,000 to 30,000 g / mol, as well as polyoxyethylene diols, polyoxyethylene triols, polyoxypropylene diols and polyoxypropylene triols with a molecular weight of 400 to 20,000 g / mol.

[0036] Also particularly suitable are so-called ethylene oxide-terminated ("EOendcapped," ethylene oxide-endcapped) polyoxypropylene polyols. These are special polyoxypropylene polyoxyethylene polyols obtained, for example, by further alkoxylating pure polyoxypropylene polyols, especially polyoxypropylene diols and triols, after completion of the polypropoxylation reaction with ethylene oxide, thereby giving them primary hydroxyl groups. Polyoxypropylene polyoxyethylene diols and polyoxypropylene polyoxyethylene triols are preferred in this case.

[0037] Polyester polyols are particularly suitable if they bear at least two hydroxyl groups and are produced by known processes, in particular the polycondensation of hydroxycarboxylic acids or the polycondensation of aliphatic and / or aromatic polycarboxylic acids with dihydric or polyhydric alcohols.

[0038] Particularly suitable are polyester polyols produced from dihydric to trihydric alcohols such as 1,2-ethanediol, diethylene glycol, 1,2-propanediol, dipropylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, glycerol, 1,1,1-trimethylolpropane, or mixtures of the aforementioned alcohols with organic dicarboxylic acids or their anhydrides or esters such as succinic acid, glutaric acid, adipic acid, trimethyladipic acid, cortic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, maleic acid, fumaric acid, dimer fatty acid, phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, dimethyl terephthalate, hexahydrophthalic acid, trimellitic acid, and trimellitic anhydride, or mixtures of the aforementioned acids, as well as polyester polyols made from lactones such as... ε-Caprolactone.

[0039] Polyester diols are particularly suitable, especially those produced from adipic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, dimer fatty acid, phthalic acid, isophthalic acid and terephthalic acid as dicarboxylic acids or from lactones such as ε-caprolactone and from ethylene glycol, diethylene glycol, neopentyl glycol, 1,4-butanediol, 1,6-hexanediol, dimer fatty acid diol and 1,4-cyclohexanedimethanol as dihydric alcohols.

[0040] Suitable polycarbonate polyols include those obtained by reacting, for example, the alcohols mentioned above (used in the synthesis of polyester polyols) with dialkyl carbonates such as dimethyl carbonate, diaryl carbonates such as diphenyl carbonate, or phosgene. Polycarbonate diols, especially amorphous polycarbonate diols, are particularly suitable.

[0041] Other suitable polyols are poly(meth)acrylate polyols.

[0042] Also suitable are polyhydroxy functional fats and oils, for example, natural fats and oils, especially castor oil, or so-called oleochemical polyols obtained by chemical modification of natural fats and oils, such as epoxy polyesters or epoxy polyethers obtained, for example, by epoxidation of unsaturated oils and subsequent ring opening with carboxylic acids or alcohols, or polyols obtained by hydroformylation and hydrogenation of unsaturated oils. Also suitable are polyols obtained from natural fats and oils through degradation processes such as alcoholysis or ozonolysis and subsequent chemical linkage, for example, by transesterification or dimerization, of the degradation products or derivatives thereof.Suitable degradation products of natural fats and oils are in particular fatty acids and fatty alcohols as well as fatty acid esters, especially the methyl esters (FAME), which can be derivatized to hydroxy fatty acid esters, for example by hydroformylation and hydrogenation.

[0043] Also suitable are polyhydrocarbon polyols, also called oligohydrocarbonols, for example polyhydroxyfunctional ethylene-propylene, ethylene-butylene or ethylene-propylene-diene copolymers, such as those produced by Kraton Polymers, USA, or polyhydroxyfunctional copolymers of dienes such as 1,3-butadiene or diene mixtures and vinyl monomers such as styrene, acrylonitrile or isobutylene, or polyhydroxyfunctional polybutadiene polyols, for example those produced by oxidation of polybutadiene or copolymerization of 1,3-butadiene and allyl alcohol, which may also be hydrogenated.

[0044] Also suitable are polyhydroxy functional acrylonitrile / butadiene copolymers, such as those produced from epoxides or amino alcohols and carboxyl-terminated acrylonitrile / butadiene copolymers, which are commercially available under the name Hypro® CTBN from Emerald Performance Materials, LLC, USA.

[0045] These polyols preferably have a mean molecular weight of 250 to 30,000 g / mol, in particular of 1,000 to 20,000 g / mol, and a mean OH functionality in the range of 1.6 to 3.

[0046] Particularly suitable polyols are polyether polyols, especially polyoxyethylene polyol, polyoxypropylene polyol and polyoxypropylene polyoxyethylene polyol, preferably polyoxyethylene diol, polyoxypropylene diol, polyoxyethylene triol, polyoxypropylene triol, polyoxypropylene polyoxyethylene diol and polyoxypropylene polyoxyethylene triol.

[0047] In addition to the polyols mentioned above, small amounts of low-molecular-weight dihydric or polyhydric alcohols such as 1,2-ethanediol, 1,2- and 1,3-propanediol, neopentyl glycol, diethylene glycol, triethylene glycol, the isomeric dipropylene glycols and tripropylene glycols, the isomeric butanediols, pentanediols, hexanediols, heptanediols, octanediols, nonanediols, decanediols, undecanediols, 1,3- and 1,4-cyclohexanedimethanol, hydrogenated bisphenol A, dimeric fatty alcohols, 1,1,1-trimethylolethane, 1,1,1-trimethylolpropane, glycerol, pentaerythritol, sugar alcohols such as xylitol, sorbitol or mannitol, sugars such as sucrose, other higher-molecular-weight alcohols, and low-molecular-weight alkoxylation products of the aforementioned dihydric and polyhydric alcohols may also be present. as well as mixtures of the aforementioned alcohols being used in the production of the polyurethane polymer having terminal isocyanate groups.

[0048] Commercially available polyisocyanates, especially diisocyanates, can be used as polyisocyanates for the production of the polyurethane polymer. Suitable diisocyanates include, for example, 1,6-hexamethylene diisocyanate (HDI), 2-methylpentamethylene-1,5-diisocyanate, 2,2,4- and 2,4,4-trimethyl-1,6-hexamethylene diisocyanate (TMDI), 1,12-dodecamethylene diisocyanate, lysine and lysine ester diisocyanate, cyclohexane-1,3-diisocyanate, cyclohexane-1,4-diisocyanate, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl-cyclohexane (= isophorone diisocyanate or IPDI), perhydro-2,4'-diphenylmethane diisocyanate and perhydro-4,4'-diphenylmethane diisocyanate, 1,4-diisocyanato-2,2,6-trimethylcyclohexane (TMCDI), 1,3- and 1,4-bis-(isocyanatomethyl)-cyclohexane, and p-xylylene diisocyanate. (m- and p-XDI), m- and p-tetramethyl-1,3-xylylene diisocyanate, m- and p-tetramethyl-1,4-xylylene diisocyanate, bis-(1-isocyanato-1-methylethyl)naphthalene, 2,4- and 2,6-toluene diisocyanate (TDI), 4,4'-, 2,4'- and 2,2'-diphenylmethane diisocyanate (MDI),1,3- and 1,4-phenylene diisocyanate, 2,3,5,6-tetramethyl-1,4-diisocyanatobenzene, naphthalene-1,5-diisocyanate (NDI), 3,3'-dimethyl-4,4'-diisocyanatodiphenyl (TODI), oligomers and polymers of the aforementioned isocyanates, and any mixtures of the aforementioned isocyanates, wherein MDI and TDI are particularly preferred.

[0049] In the composition according to the invention, the polyurethane polymer comprising isocyanate groups is PU preferably present in an amount of 10 wt.% to 60 wt.%, in particular in an amount of 15 wt.% to 50 wt.%, based on the total composition.

[0050] In one-component compositions containing the polyurethane polymer having isocyanate groups PU It may be advantageous to block the isocyanate groups and thus make them latent in order to increase storage stability by preventing premature reaction in the container.

[0051] The blocking of isocyanate groups to produce blocked or latent isocyanate groups using suitable blocking agents that can react thermoreversibly with isocyanate groups is a common practice in the field and can be readily carried out by a person skilled in the art. A wide range of suitable blocking agents or blocking groups are known to a person skilled in the art, for example, from the review articles by Douglas A. Wick in Progress in Organic Coatings 36 (1999), 148-172 and in Progress in Organic Coatings 41 (2001), 1-83, to which reference is hereby made.

[0052] Another, sometimes even more advantageous, method for stabilizing one-component polyurethane compositions is the use of latent hardeners. These are blocked (latent) polyamines that, under the influence of, for example, water, lose their blocking group and react to form free amines, which then react rapidly with the isocyanates, resulting in crosslinking.

[0053] Such blocked amines as latent hardeners are well known to those skilled in the art, and many methods for producing and using latent amines can be found in the prior art. For example, they are described in US 4,469,831, US 4,853,454 and US 5,087,661 as well as in EP 1772447, to which reference is hereby made.

[0054] In another embodiment, the moisture-reactive polymer comprises P at least one silane-functional polymer STP.

[0055] In one embodiment, the silane-functional polymer is a polydiorganosiloxane polymer. Thus, the composition is a silicone composition comprising silane-functional polymers with reactive silane end groups, for example, alkoxy, acetoxy, or oxime silane end groups, and / or silane-functional polymers with silanol end groups, wherein, particularly in the latter case, the composition must also contain silicone crosslinkers. Such silicone systems have long been known to those skilled in the art. For example, such silicone systems, in particular the associated silane-functional polymers and crosslinkers suitable for the present invention, are described in WO 2018 / 033563 A1.

[0056] The silane-functional polymer STPPreferably, the polymer is an organic polymer containing silane groups, in particular a polyurethane, polyolefin, polyester, polyamide, poly(meth)acrylate, or polyether, or a mixture of these polymers, each containing one or preferably several silane groups. The silane groups can be located laterally in the chain or terminally and are bonded to the organic polymer via a carbon atom.

[0057] Particularly preferred is the silane-containing organic polymer a silane-containing polyurethane or a silane-containing polyolefin or a silane-containing polyester or a silane-containing poly(meth)acrylate or a silane-containing polyether or a mixture of these polymers.

[0058] The most preferred organic polymer containing silane groups is a silane group-containing polyether or a silane group-containing polyurethane, which is preferably composed of polyether polyols.

[0059] The silane-containing organic polymer preferably has alkoxysilane groups as silane groups, in particular alkoxysilane groups of formula (I), where R 14< represents a linear or branched monovalent hydrocarbon residue with 1 to 5 C atoms, in particular for methyl or for ethyl or for isopropyl; R 15< represents a linear or branched monovalent hydrocarbon residue with 1 to 8 C atoms, in particular for methyl or for ethyl; and x represents a value of 0 or 1 or 2, preferably for 0 or 1, in particular for 0.

[0060] R 14< is particularly preferred for methyl or ethyl.

[0061] Trimethoxysilane groups, dimethoxymethylsilane groups or triethoxysilane groups are particularly preferred.

[0062] Methoxysilane groups have the advantage of being particularly reactive, while ethoxysilane groups have the advantage of being toxicologically favorable and particularly stable in storage.

[0063] The silane-containing organic polymer preferably has an average of 1.3 to 4, more preferably 1.5 to 3, and particularly preferably 1.7 to 2.8, silane groups per molecule. The silane groups are preferably terminal.

[0064] The silane group-containing organic polymer STP The polymer preferably has a mean molecular weight in the range of 1,000 to 30,000 g / mol, particularly 2,000 to 20,000 g / mol. The silane-containing organic polymer preferably has a silane equivalent weight of 300 to 25,000 g / eq, particularly 500 to 15,000 g / eq.

[0065] The silane group-containing organic polymer STP It can be solid or liquid at room temperature. Preferably, it is liquid at room temperature.

[0066] The organic polymer containing silane groups is usually preferred. STP a silane group-containing polyether that is liquid at room temperature, wherein the silane groups are in particular dialkoxysilane groups and / or trialkoxysilane groups, especially preferably trimethoxysilane groups or triethoxysilane groups.

[0067] Methods for producing polyethers containing silane groups are known to those skilled in the art.

[0068] In a preferred process, silane-containing polyethers are obtainable from the reaction of allyl-containing polyethers with hydrosilanes, optionally with chain extension using, for example, diisocyanates.

[0069] In another preferred process, silane group-containing polyethers are obtainable from the copolymerization of alkylene oxides and epoxysilanes, optionally with chain extension using, for example, diisocyanates.

[0070] In another preferred process, silane group-containing polyethers are obtainable from the reaction of polyether polyols with isocyanatosilanes, optionally with chain extension using diisocyanates.

[0071] In another preferred process, silane-containing polyethers are obtained from the reaction of isocyanate-containing polyethers, in particular NCO-terminated urethane polyethers, from the reaction of polyether polyols with a superstoichiometric amount of polyisocyanates, with aminosilanes, hydroxysilanes, or mercaptosilanes. Silane-containing polyethers from this process are particularly preferred. This process allows the use of a variety of commercially available, inexpensive starting materials, enabling the obtaining of different polymer properties, such as high ductility, high strength, a low modulus of elasticity, a low glass transition temperature, or high weather resistance.

[0072] Particularly preferred is the silane-containing polyurethane obtainable from the reaction of NCO-terminated urethane polyethers with aminosilanes or hydroxysilanes. Suitable NCO-terminated urethane polyethers are obtainable from the reaction of polyether polyols, in particular polyoxyalkylene diols or polyoxyalkylene triols, preferably polyoxypropylene diols or polyoxypropylene triols, with a superstoichiometric amount of polyisocyanates, in particular diisocyanates.

[0073] Preferably, the reaction between the polyisocyanate and the polyether polyol is carried out under exclusion of moisture at a temperature of 50 °C to 160 °C, optionally in the presence of suitable catalysts, wherein the polyisocyanate is dosed such that its isocyanate groups are present in stoichiometric excess relative to the hydroxyl groups of the polyol. In particular, the excess of polyisocyanate is selected such that, after the reaction of all hydroxyl groups, the resulting urethane polyether retains a free isocyanate group content of 0.1 to 5 wt%, preferably 0.2 to 4 wt%, and most preferably 0.3 to 3 wt%, based on the total polymer.

[0074] Preferred diisocyanates are selected from the group consisting of 1,6-hexamethylene diisocyanate (HDI), 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (isophorone diisocyanate or IPDI), 2,4- and 2,6-toluene diisocyanate and any mixtures of these isomers (TDI), and 4,4'-, 2,4'- and 2,2'-diphenylmethane diisocyanate and any mixtures of these isomers (MDI). IPDI or TDI are particularly preferred. IPDI is most preferred. This results in silane-containing polyurethanes with particularly good lightfastness.

[0075] Polyoxyalkylene diols or polyoxyalkylene triols with a degree of unsaturation lower than 0.02 mEq / g, in particular lower than 0.01 mEq / g, and a mean molecular weight in the range of 400 to 25,000 g / mol, in particular 1,000 to 20,000 g / mol, are particularly suitable as polyether polyols.

[0076] In addition to polyether polyols, other polyols can also be used in proportion, in particular polyacrylate polyols, as well as low molecular weight diols or triols.

[0077] Suitable aminosilanes for reaction with an NCO-terminated urethane polyether are primary and secondary aminosilanes. Preferred are 3-aminopropyltrimethoxysilane, 3-aminopropyldimethoxymethylsilane, 4-aminobutyltrimethoxysilane, 4-amino-3-methylbutyltrimethoxysilane, 4-amino-3,3-dimethylbutyltrimethoxysilane, N-butyl-3-aminopropyltrimethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, adducts of primary aminosilanes such as 3-aminopropyltrimethoxysilane, 3-aminopropyldimethoxymethylsilane, or N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and Michael acceptors such as acrylonitrile, (meth)acrylic esters, (meth)acrylamides, maleic or fumaric diesters, citraconic diesters, or itaconic diesters, in particular N-

[0078] (3-Trimethoxysilylpropyl)aminosuccinic acid dimethyl or diethyl ester. Analogues of the aforementioned aminosilanes with ethoxy or isopropoxy groups instead of the methoxy groups on the silicon are also suitable.

[0079] Suitable hydroxysilanes for reaction with an NCO-terminated urethane polyether are particularly obtainable from the addition of aminosilanes to lactones or to cyclic carbonates or to lactides.

[0080] Suitable aminosilanes for this purpose include, in particular, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 4-aminobutyltrimethoxysilane, 4-aminobutyltriethoxysilane, 4-amino-3-methylbutyltrimethoxysilane, 4-amino-3,3-dimethylbutyltrimethoxysilane, 4-amino-3,3-dimethylbutyltriethoxysilane, 2-aminoethyltrimethoxysilane, and 2-aminoethyltriethoxysilane. 3-Aminopropyltrimethoxysilane, 3-Aminopropyltriethoxysilane, 4-amino-3,3-dimethylbutyltrimethoxysilane, and 4-amino-3,3-dimethylbutyltriethoxysilane are especially preferred.

[0081] Suitable lactones include, in particular, γ-valerolactone, γ-octalactone, δ-decalactone, and ε-decalactone, especially γ-valerolactone.

[0082] Suitable cyclic carbonates include 4,5-dimethyl-1,3-dioxolan-2-one, 4,4-dimethyl-1,3-dioxolan-2-one, 4-ethyl-1,3-dioxolan-2-one, 4-methyl-1,3-dioxolan-2-one or 4-(phenoxymethyl)-1,3-dioxolan-2-one.

[0083] Suitable lactides include 1,4-dioxane-2,5-dione (lactide from 2-hydroxyacetic acid, also called "glycolide"), 3,6-dimethyl-1,4-dioxane-2,5-dione (lactide from lactic acid, also called "lactide") and 3,6-diphenyl-1,4-dioxane-2,5-dione (lactide from mandelic acid).

[0084] Preferred hydroxysilanes obtained in this way are N-(3-Triethoxysilylpropyl)-2-hydroxypropanamide, N-(3-Trimethoxysilylpropyl)-2-hydroxypropanamide, N-(3-Triethoxysilylpropyl)-4-hydroxypentanamide, N-(3-Triethoxysilylpropyl)-4-hydroxyoctanamide, N-(3-Triethoxysilylpropyl)-5-hydroxydecanamide and N-(3-Triethoxysilylpropyl)-2-hydroxypropylcarbamate.

[0085] Furthermore, suitable hydroxysilanes can also be obtained from the addition of aminosilanes to epoxides or from the addition of amines to epoxysilanes. Preferred hydroxysilanes obtained in this way are 2-morpholino-4(5)-(2-trimethoxysilylethyl)cyclohexan-1-ol, 2-morpholino-4(5)-(2-triethoxysilylethyl)cyclohexan-1-ol, or 1-morpholino-3-(3-(triethoxysilyl)propoxy)propan-2-ol.

[0086] Suitable products include commercially available silane-containing polyethers or polyurethanes, in particular the following: MS Polymer™< (from Kaneka Corp.; especially types S203H, S303H, S227, S810, MA903 and S943); MS Polymer™< or Silyl™< (from Kaneka Corp.; especially types SAT010, SAT030, SAT200, SAX350, SAX400, SAX725, MAX450, MAX951); Excestar®< (from Asahi Glass Co. Ltd.; especially types S2410, S2420, S3430, S3630); SPUR+* (from Momentive Performance Materials; especially types 1010LM, 1015LM, 1050MM); Vorasil™< (from Dow Chemical Co.; in particular types 602 and 604); Desmoseal ®< (from Bayer MaterialScience AG; in particular types S XP 2458, S XP 2636, S XP 2749, S XP 2774 and S XP 2821), TEGOPAC ®< (from Evonik Industries AG; in particular types Seal 100, Bond 150, Bond 250), Polymer ST (from Hanse Chemie AG / Evonik Industries AG, in particular types 47, 48, 61, 61LV, 77, 80, 81); Geniosil ®< STP (from Wacker Chemie AG; in particular types E10, E15, E30, E35).

[0087] Particularly preferred silane-containing organic polymers have end groups of formula (II), where R 16< represents a linear or branched divalent hydrocarbon residue with 1 to 12 C atoms, optionally comprising cyclic and / or aromatic components and optionally one or more heteroatoms, in particular one or more nitrogen atoms; T represents a divalent residue selected from -O-, -S-, -N(R 17< )-, -O-CO-N(R 17< )-, -N(R 17< )-CO-O- and -N(R 17< )-CO-N(R 17< )-, wherein R 17< represents a hydrogen residue or a linear or branched hydrocarbon residue with 1 to 20 C atoms, optionally comprising cyclic components and optionally comprising an alkoxysilane, ether or carboxylic ester group; and R 14< , R 15< and x have the meanings already mentioned.

[0088] Preferably, R 16< represents 1,3-propylene or 1,4-butylene, where butylene may be substituted with one or two methyl groups.

[0089] R 16< is particularly preferred for 1,3-propylene.

[0090] In a preferred embodiment of the moisture-curing composition according to the present invention, the moisture-reactive polymer comprises P at least one polyurethane polymer PU wherein the polyurethane polymer PU has free or latent isocyanate groups and the composition optionally includes a latent hardener for isocyanate groups.

[0091] In a further preferred embodiment of the moisture-curing composition according to the present invention, the moisture-reactive polymer comprises P at least one silane-functional polymer STP.

[0092] In the composition according to the invention, the silane-functional polymer STP preferably present in an amount of 10 wt.% to 60 wt.%, in particular in an amount of 15 wt.% to 50 wt.%, based on the total composition.

[0093] The composition according to the invention further comprises between 3 and 25 wt.%, preferably between 4 and 20 wt.%, based on the total composition, at least one type of microscopic hollow spheres. H.

[0094] The microscopic hollow spheres H They have a compressive strength, measured according to ASTM D3102-72, of at least 2.5 MPa, preferably at least 5 MPa.

[0095] The compressive strength can be determined using ASTM D3102-72. A detailed method for measuring preferred microscopic hollow spheres. H Further information based on this industry standard can be found in WO 2012 / 033810, p. 15, second paragraph.

[0096] When microscopic hollow spheres HUsing materials with a compressive strength of less than 2.5 MPa not only impairs pumpability and density stability after pumping, but surprisingly also results in a material with lower tensile strength and poorer application properties. Therefore, it is essential for the invention that microscopic hollow spheres H must be used with a compressive strength of at least 2.5 MPa.

[0097] Furthermore, the microscopic hollow spheres must HTo fulfill the tasks according to the invention, a volume-based particle size D90, measured with a Coulter counter, of less than 100 µm is required. Other measurement methods such as sieve analysis or dynamic light scattering can also be used for particle size; however, it must be ensured (e.g., by comparative measurements) that any method-dependent measurement errors are taken into account when comparing different methods. The Coulter counter has proven to be an accurate and reproducible measurement method for microscopic hollow spheres. H, especially those made of glass. Such a measurement, including a suitable measuring device, is described in US 8,261,577 (column 8, lines 7-12). The accuracy of particle measurement with the Coulter counter for particles of this size order, in comparison with other measurement methods, is described, for example, in the Journal of Geophysical Research, Vol. 115, C08024, 2010, pp. 1-19.

[0098] The particle size D90 describes the value that 90% of the particles in a sample fall below. In other words, 90% of the particles possess the microscopic hollow spheres. H a particle size of less than 100 µm.

[0099] The microscopic hollow spheres preferably exhibit H a volume-based median particle size D50 from 15 to 65 µm and a volume-based particle size D10 from 5 to 30 µm.

[0100] The median particle size D50 describes the value at which half of the particles in a sample are larger than this value and half of the particles are smaller than this value. The particle size D10 describes the value at which 10% of the particles in a sample are still smaller than this value.

[0101] Preferably, the microscopic hollow spheres contain Hat most 5%, preferably at most 1%, particles with a particle size greater than 110 µm. In particular, the microscopic hollow spheres contain H No measurable quantity of particles with a particle size greater than 110 µm.

[0102] The microscopic hollow spheres H Essentially, they are spherical bodies comprising a shell and an interior gas. The gas can be, for example, air, CO₂, nitrogen, oxygen, hydrogen, a noble gas, or mixtures of these gases. The shell can be made of, for example, glass, especially borosilicate glass, silicates, especially aluminosilicate, or polymers, especially thermoplastic polymers.

[0103] Microscopic hollow spheres are preferred. H Made of glass, especially borosilicate glass. Suitable microscopic hollow spheres. H Glass and its manufacture are taught, for example, in US 8,261,577 and WO 2012 / 033810.

[0104] Preferred suitable, commercially available microscopic hollow spheres H Made of glass, 3M™ Glass Bubbles are available from 3M Germany GmbH. The preferred types are K20, K25, K32, K37, and S28HS.

[0105] In a preferred embodiment of the moisture-curing composition according to the present invention, the microscopic hollow spheres H Hollow glass spheres, especially borosilicate glass spheres, with a diameter of no more than 110 µm.

[0106] The composition according to the invention further comprises at least one inorganic filler. F, with a proportion of at least 9 wt.%, based on the total composition. Preferably, the composition contains at most 50 wt.%, in particular at most 40 wt.%, of inorganic filler. F, relating to the overall composition.

[0107] A content of inorganic filler Fof at least 9 wt.% in combination with the microscopic hollow spheres H This is essential for the mechanical properties and application characteristics of the cured composition. However, if the filler content is too high, exceeding 50 wt%, it becomes difficult to achieve a sufficiently low density of less than 1.20 kg / L.

[0108] Suitable as inorganic fillers FExamples include chalks, especially natural, ground or precipitated calcium carbonates, which may be coated with fatty acids, especially stearic acid, barite (barytes), talcs, quartz flours, quartz sand, dolomites, ground cement, wollastonites, kaolins, calcined kaolins, silicates such as mica (potassium aluminum silicate), molecular sieves, aluminum oxides, aluminum hydroxides, magnesium hydroxide, precipitated or pyrogenic silicas including highly dispersed silicas from pyrolysis processes, metal powders such as aluminum, copper, iron, silver or steel, and metal oxides such as titanium dioxide.

[0109] Preferred fillers FThese fillers are natural, ground or precipitated calcium carbonates, optionally coated with fatty acids, in particular stearic acid, as well as precipitated or pyrogenic silicas, including highly dispersed silicas from pyrolysis processes, as well as metal oxides such as titanium dioxide, aluminum trihydrate, and mixtures of these fillers. Aluminum trihydrate (ATH), also called γ-Al(OH)₃ and known as the mineral gibbsite (hydrargillite), is a flame-retardant filler known to those skilled in the art. All fillers F They can also be surface-coated, particularly hydrophobic. Fatty acids are preferred as surface coatings, or alkylsilane-based coatings in the case of silica fillers. These form a hydrophobic shell around the particles. Stearic acid, for example, is a particularly preferred fatty acid for coating.

[0110] In a preferred embodiment of the moisture-curing composition according to the present invention, the composition contains at least 25 wt.% inorganic filler. F, and preferably at most 40 wt.%, based on the total composition. This embodiment possesses particularly high tensile strength at relatively low density and good extensibility and is very well suited as an adhesive or elastic sealant. Furthermore, this embodiment can be made white or colored. A particularly preferred embodiment comprises 25 to 40 wt.% inorganic filler. F, based on the total composition, as well as 4 to 20 wt.% microscopic hollow spheres H, referring to the entire composition.

[0111] In a further preferred embodiment of the moisture-curing composition according to the present invention, the composition contains at least 9 wt.% inorganic filler. F, and preferably at most 15 wt.%, based on the total composition. This embodiment has a particularly low density with good tensile strength and good extensibility and is very well suited as a parquet adhesive or joint sealant. Furthermore, this embodiment can be made white or colored. A particularly preferred embodiment comprises 9 to 15 wt.% inorganic filler. F, based on the total composition, plus 5 to 15 wt.% microscopic hollow spheres H, referring to the entire composition,

[0112] In further preferred embodiments of the moisture-curing composition according to the present invention, the composition additionally contains at least one carbon black, preferably between 1 and 25 wt.%, in particular between 5 and 20 wt.%, based on the total composition.

[0113] The use of carbon black has the advantage that particularly good mechanical properties, especially tensile strength, can be achieved at relatively low extrusion forces, which particularly enables the use of these embodiments as structural adhesives. A particularly preferred embodiment of such carbon black-containing compositions comprises 9 to 15 wt.% inorganic filler. F, based on the total composition, plus 4 to 15 wt.% microscopic hollow spheres H, referring to the entire composition,

[0114] Suitable carbon blacks are all common industrial carbon blacks, especially dried carbon blacks. Suitable as dried carbon black are all common industrial carbon blacks (carbon black), such as Monarch® < 570, available from Cabot.

[0115] Additional fillers such as organic fillers, for example PVC powder or graphite, can also be used. Expandable graphites, which have an intumescent effect, are preferred. All commercially available types are suitable, such as Nyagraph® < 250, available from Nyacol Nano Technologies, or the expandable graphites from Asbury Carbons.

[0116] Preferred embodiments of the present invention achieve fire protection class C (s2, d0) according to DIN EN 13501-1 after curing.

[0117] The composition preferably contains at least one catalyst for the crosslinking of the moisture-crosslinking polymers. P,especially for the crosslinking of silane groups and / or for the crosslinking of isocyanate groups with amines or alcohols. Suitable catalysts include, in particular, metal compounds and / or basic nitrogen or phosphorus compounds. Suitable metal compounds are, in particular, compounds of tin, titanium, zirconium, aluminum, or zinc, especially diorganotin(IV) compounds such as, in particular, dibutyltin(IV) diacetate, dibutyltin(IV) dilaurate, dibutyltin(IV) dineodecanoate, or dibutyltin(IV) bis(acetylacetonate) and dioctyltin(IV) dilaurate, as well as titanium(IV), zirconium(IV), aluminum(III), or zinc(II) complexes with, in particular, alkoxy, carboxylate, 1,3-diketonate, 1,3-ketoesterate, or 1,3-ketoamidate ligands.

[0118] Suitable organotitanates include titanium(IV) complex compounds. Particularly suitable are the commercially available types Tyzor®< AA, GBA, GBO, AA-75, AA-65, AA-105, DC, BEAT, BTP, TE, TnBT, KTM, TOT, TPT or IBAY (all from Dorf Ketal); Tytan PBT, TET, X85, TAA, ET, S2, S4 or S6 (all from Borica Company Ltd.); and Ken-React®< KR®< TTS, 7, 9QS, 12, 26S, 33DS, 38S, 39DS, 44, 134S, 138S, 133DS, 158FS or LICA®< 44 (all from Kenrich Petrochemicals).

[0119] Suitable basic nitrogen or phosphorus compounds are in particular imidazoles, pyridines, phosphazene bases or preferably amines, hexahydrotriazines, biguanides, guanidines or amidines.

[0120] Suitable amines include, in particular, alkyl, cycloalkyl or aralkylamines; amide-containing polyamines, so-called polyamidoamines, such as those available commercially, for example under the brand names Versamid ®< (from Cognis), Aradur ®< (from Huntsman), Euretek ®< (from Huntsman) or Beckopox ®< (from Cytec); or aminosilanes, such as, in particular, 3-aminopropyltrimethoxysilane, 3-aminopropyldimethoxymethylsilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyl-methyldimethoxysilane, N-(2-aminoethyl)-N'-[3-(trimethoxysilyl)propyl]ethylenediamine or their analogues with ethoxy groups instead of methoxy groups on the silicon. Suitable hexahydrotriazines are in particular 1,3,5-hexahydrotriazine or 1,3,5-tris(3-(dimethylamino)propyl)-hexahydrotriazine.

[0121] Geeignete Biguanide sind insbesondere Biguanid, 1-Butylbiguanid, 1,1-Dimethylbiguanid, 1-Butylbiguanid, 1-Phenylbiguanid oder 1-(o-Tolyl)biguanid (OTBG). Geeignete Guanidine sind insbesondere 1-Butylguanidin, 1,1-Dimethylguanidin, 1,3-Dimethylguanidin, 1,1,3,3-Tetramethylguanidin (TMG), 2-(3-(Tri-methoxysilyl)propyl)-1,1,3,3-tetramethylguanidin, 2-(3-(Methyldimethoxysilyl)-propyl)-1,1,3,3-tetramethylguanidin, 2-(3-(Triethoxysilyl)propyl)-1,1,3,3-tetramethylguanidin, 1,5,7-Triazabicyclo[4.4.0]dec-5-en (TBD), 7-Methyl-1,5,7-triazabicyclo[4.4.0]dec-5-en, 7-Cyclohexyl-1,5,7-triazabicyclo[4.4.0]dec-5-en, 1-Phenylguanidin, 1-(o-Tolyl)guanidin (OTG), 1,3-Diphenylguanidin, 1,3-Di(o-to-lyl)guanidin oder 2-Guanidinobenzimidazol.

[0122] Suitable amidines are in particular 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), 1,5-diazabicyclo[4.3.0]non-5-ene (DBN), 6-dibutylamino-1,8-diazabicyclo[5.4.0]undec-7-ene, 6-Dibutylamino-1,8-diazabicyclo[5.4.0]undec-7-ene, N,N'-Di-n-hexylacetamidine (DHA), 2-methyl-1,4,5,6-tetrahydropyrimidine, 1,2-dimethyl-1,4,5,6-tetrahydropyrimidine, 2,5,5-trimethyl-1,4,5,6-tetrahydropyrimidine, N-(3-trimethoxysilylpropyl)-4,5-dihydroimidazole or N-(3-Triethoxysilylpropyl)-4,5-dihydroimidazole.

[0123] Furthermore, the composition can contain an acid as a co-catalyst, in particular a carboxylic acid. Preferably, aliphatic carboxylic acids such as formic acid, lauric acid, stearic acid, isostearic acid, oleic acid, 2-ethyl-2,5-dimethylcaproic acid, 2-ethylhexanoic acid, neodecanoic acid, aromatic carboxylic acids such as salicylic acid, fatty acid mixtures from the saponification of natural fats and oils, or di- and polycarboxylic acids, in particular poly(meth)acrylic acids, are used.

[0124] The composition may contain other components, in particular the following excipients and additives: Adhesion promoters and / or crosslinking agents, in particular aminosilanes such as 3-aminopropyl-trimethoxysilane, 3-aminopropyl-dimethoxymethylsilane, N-(2-aminoethyl)-3-aminopropyl-trimethoxysilane, N-(2-aminoethyl)-3-aminopropyl-dimethoxymethylsilane, N-(2-aminoethyl)-N'-[3-(trimethoxysilyl)propyl]ethylenediamine or their analogues with ethoxy instead of methoxy groups, furthermore N-phenyl-, N-cyclohexyl- or N-alkylaminosilanes, mercaptosilanes, epoxysilanes, (meth)acrylosilanes, anhydridosilanes, carbamatosilanes, alkylsilanes or iminosilanes, oligomeric forms of these silanes, adducts of primary aminosilanes with epoxysilanes or (meth)acrylosilanes or anhydridosilanes, amino-functional alkylsilsesquioxanes, especially amino-functionalized methylsilsesquioxane or amino-functionalized propylsilsesquioxane. Particularly suitable are 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane,3-Glycidoxypropyltrimethoxysilane, 3-Glycidoxypropyltriethoxysilane or 3-Ureidopropyltrimethoxysilane, or oligomeric forms of these silanes; drying agents, in particular tetraethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane or organoalkoxysilanes having a functional group in the α-position to the silane group, in particular N-(methyldimethoxysilylmethyl)-O-methylcarbamate, (methacryloxymethyl)silanes, methoxymethylsilanes, orthoformic acid esters, calcium oxide or molecular sieves, in particular vinyltrimethoxysilane or vinyltriethoxysilane; Plasticizers, in particular carboxylic acid esters such as phthalates, especially dioctyl phthalate, bis(2-ethylhexyl) phthalate, bis(3-propylheptyl) phthalate, diisononyl phthalate or diisodecyl phthalate, diesters of ortho-cyclohexanedicarboxylic acid, especially diisononyl-1,2-cyclohexanedicarboxylate, adipates, especially dioctyl adipate, bis(2-ethylhexyl) adipate, azelates, especially bis(2-ethylhexyl) acelate, sebacates,in particular bis(2-ethylhexyl) sebacate or diisononyl sebacate, polyols, in particular polyoxyalkylene polyols or polyester polyols, glycol ethers, glycol esters, organic phosphoric or sulfonic acid esters, sulfonamides, polybutenes or fatty acid methyl or ethyl esters derived from natural fats or oils, also called "biodiesel"; solvents; organic fillers, in particular graphite, cellulose, polymer powders, in particular PVC powder; fibers, in particular glass fibers, carbon fibers, metal fibers, ceramic fibers or plastic fibers such as polyamide fibers or polyethylene fibers; dyes and pigments; rheology modifiers, in particular thickeners, in particular layered silicates such as bentonites, derivatives of castor oil, hydrogenated castor oil, polyamides, polyurethanes, urea compounds, pyrogenic silicas, cellulose ethers or hydrophobically modified polyoxyethylenes; stabilizers against oxidation, heat, light or UV radiation; natural resins,Fats or oils such as rosin, shellac, linseed oil, castor oil or soybean oil; non-reactive polymers, in particular homo- or copolymers of unsaturated monomers, especially from the group comprising ethylene, propylene, butylene, isobutylene, isoprene, vinyl acetate or alkyl(meth)acrylates, in particular polyethylene (PE), polypropylene (PP), polyisobutylene, ethylene vinyl acetate copolymers (EVA) or atactic poly-α-olefins (APAO); surfactants, in particular wetting agents, leveling agents, deaerating agents or defoamers; biocides, in particular algicides, fungicides or fungal growth inhibitors; as well as other substances commonly used in curable compositions. It may be advantageous to dry certain components chemically or physically before mixing them into the composition.

[0125] In a preferred embodiment, the composition contains at least one additive, wherein the additive is selected from the list consisting of plasticizer, hardening catalyst, stabilizers, thixotropic agents, adhesion promoters and drying agents.

[0126] In a particularly preferred embodiment, the composition contains at least one drying agent and at least one adhesion promoter.

[0127] The composition is preferably manufactured and stored in the absence of moisture. Typically, it is stable when stored in suitable packaging or arrangement, such as a bottle, can, bag, bucket, drum, or cartridge, provided it is protected from moisture.

[0128] The composition can be in the form of a single-component or a multi-component, in particular a two-component, composition.

[0129] In this document, a "single-component" composition is defined as one in which all components of the composition are mixed and stored in the same container and which is moisture-curable.

[0130] In this document, a "two-component" composition refers to one in which the components are contained in two separate containers. The two components are mixed together only shortly before or during application, after which the mixture hardens, possibly under the influence of moisture.

[0131] A second or possibly further component(s) is / are mixed with the first component before or during application, in particular via a static mixer or a dynamic mixer.

[0132] The composition is applied particularly at ambient temperature, preferably in a temperature range between 0°C and 45°C, especially 5°C to 35°C, and hardens even under these conditions.

[0133] When applying in the case of using silane-functional polymers STP The crosslinking reaction of the silane groups begins, possibly under the influence of moisture. Existing silane groups can condense with existing silanol groups to form siloxane groups (Si-O-Si groups). Upon contact with moisture, existing silane groups can also hydrolyze to silanol groups (Si-OH groups) and subsequently form siloxane groups (Si-O-Si groups) through further condensation reactions. As a result of these reactions, the composition eventually hardens.

[0134] If water is required for curing, it can either come from the air (humidity), or the composition can be brought into contact with a water-containing component, for example by coating it with a smoothing agent or by spraying it, or water or a water-containing component can be added to the composition during application, for example in the form of a water-containing or water-releasing liquid or paste. A paste is particularly suitable if the composition itself is in paste form.

[0135] When curing is achieved using atmospheric moisture, the composition hardens from the outside in, initially forming a skin on the surface. The so-called skin formation time is a measure of the curing rate of the composition. This curing rate is generally determined by various factors, such as the availability of water, temperature, etc.

[0136] The composition is suitable for a wide variety of applications, in particular as a resin for the production of fiber-reinforced composites, as rigid foam, flexible foam, molded part, elastomer, fiber, film or membrane, as a potting compound, sealant, adhesive, coating, covering or paint for construction and industrial applications, for example as seam sealant, cavity sealant, electrical insulating compound, filler, joint sealant, weld or flange sealant, assembly adhesive, bodywork adhesive, windscreen adhesive, sandwich panel adhesive, laminating adhesive, laminate adhesive, packaging adhesive, wood adhesive, parquet adhesive, anchoring adhesive, floor covering, floor coating, balcony coating, roof coating, concrete protection coating, parking garage coating, sealant, pipe coating, corrosion protection coating, textile coating, damping element, sealing element or filler.

[0137] The composition is particularly suitable as an adhesive and / or sealant, especially for joint sealing and elastic adhesive bonds in construction and industrial applications, as well as an elastic coating with crack-bridging properties, especially for protecting and / or sealing, for example, roofs, floors, balconies, parking decks or concrete pipes, and as an adhesive and / or sealant in the manufacture, repair and outfitting of means of transport, such as rail transport, road transport, aircraft and ships.

[0138] Preferably, the composition is an adhesive, a sealant, or a coating.

[0139] Such a composition typically contains plasticizers, fillers, adhesion promoters and / or crosslinking agents and drying agents, and possibly other auxiliary and additive substances.

[0140] The composition according to the invention has a density of less than 1.20 kg / L, preferably less than 1.10 kg / L. In particularly preferred embodiments, the composition according to the invention has a density of less than 1.00 kg / L, in particular less than 0.90 kg / L.

[0141] The density can be determined using a density measuring device, preferably a pycnometer, or by water displacement (volume measurement by Archimedes' principle).

[0142] The person skilled in the art can easily adjust the desired density of the composition by varying the quantities and type of the components of the composition according to claim 1 by routine experiments.

[0143] For use as an adhesive or sealant, the composition preferably has a pasty consistency with shear-thinning properties. Such a pasty sealant or adhesive is applied to a substrate, in particular, from commercially available cartridges operated manually, by compressed air or battery, or from a drum or bucket using a feed pump or extruder, optionally by means of an application robot.

[0144] For use as a coating, the composition preferably has a liquid consistency at room temperature with self-leveling properties. Optionally, it is slightly thixotropic, so that the coating can be applied to sloping to vertical surfaces without immediately running off. It is applied in particular by roller or brush, or by pouring and spreading using, for example, a roller, a scraper, or a notched trowel.

[0145] During application, the composition is preferably applied to at least one substrate.

[0146] Suitable substrates include in particular Glass, glass ceramics, concrete, mortar, brick, tile, gypsum or natural stones such as limestone, granite or marble; metals and alloys such as aluminium, iron, steel or non-ferrous metals, as well as surface-treated metals or alloys such as galvanised or chrome-plated metals; leather, textiles, paper, wood, with resins, for example phenolic, melamine or epoxy resins, bonded wood-based materials, resin-textile composites and other so-called polymer composites;Plastics such as polyvinyl chloride (rigid and flexible PVC), acrylonitrile butadiene styrene copolymers (ABS), polycarbonate (PC), polyamide (PA), polyester, polymethyl methacrylate (PMMA), epoxy resins, polyurethanes (PUR), polyoxymethylene (POM), polyolefins (PO), polyethylene (PE) or polypropylene (PP), ethylene / propylene copolymers (EPM) or ethylene / propylene / diene terpolymers (EPDM), or fiber-reinforced plastics such as carbon fiber reinforced plastics (CFRP), glass fiber reinforced plastics (GFRP) or sheet molding compounds (SMC), wherein the plastics may preferably be surface-treated by plasma, corona or flame; coated substrates such as powder-coated metals or alloys; paints or varnishes, in particular automotive topcoats.

[0147] The substrates may be pretreated prior to application of the composition, if necessary, in particular by physical and / or chemical cleaning processes or by applying an adhesion promoter, an adhesion promoter solution or a primer.

[0148] Two similar or two different substrates can be bonded or sealed, in particular the substrates mentioned above.

[0149] After the composition has hardened with water, especially in the form of humidity, a hardened composition is obtained.

[0150] The application of the composition results in an article which is, in particular, bonded, sealed, or coated with the composition. The article is, in particular, a building structure, especially a building structure (above or below ground), an industrially manufactured good, or a consumer good, in particular a window, a household appliance, or a means of transport such as, in particular, an automobile, a bus, a truck, a rail vehicle, a ship, an aircraft, or a helicopter; or the article may be an accessory component thereof.

[0151] Another aspect of the invention is the use of a moisture-curing composition as described above as an adhesive, sealant or coating for sound insulation and / or thermal insulation.

[0152] Another aspect of the invention is the use of a moisture-curing composition as described above as an adhesive, sealant or coating with fire protection properties, which, after curing, achieves fire protection class C (s2, d0) according to DIN EN 13501-1.

[0153] Another aspect of the invention is the use of a moisture-curing composition as described above as an adhesive, sealant or coating for weight reduction.

[0154] Another aspect of the invention is a structure or manufactured item that has been bonded, sealed or coated with an adhesive, sealant or coating according to the preceding description.

[0155] Another aspect of the invention is a hardened composition as described above. Examples

[0156] The following are exemplary embodiments intended to further illustrate the described invention. Of course, the invention is not limited to these described embodiments.

[0157] A temperature of 23±1°C and a relative humidity of 50±5% are referred to as "standard climate".

[0158] The Tensile strength and the Elongation at break were determined according to DIN 53504 (drawing speed: 200 mm / min) on films cured for 7 days at 23°C and 50% relative humidity with a layer thickness of 2 mm.

[0159] For the determination of Extinguishing forceThe compositions were filled into internally coated aluminum cartridges (outer diameter 46.9 mm, inner diameter 46.2 mm, length 215 mm, opening 15 mm) and hermetically sealed with a polyethylene stopper (diameter 46.1 mm) from Novelis Deutschland GmbH. After conditioning for 24 hours at 23°C, the cartridges were opened and emptied using a dispensing tool. For this purpose, a nozzle with a 3 mm inner diameter opening was screwed onto the cartridge thread. Using a dispensing tool (Zwick / Roell Z005), the force required to dispense the composition at a dispensing speed of 60 mm / min was determined. The value given is an average of the forces measured after dispensing strokes of 22 mm, 24 mm, 26 mm, and 28 mm. The measurement was stopped after 30 mm of dispensing.

[0160] The measurement of density The analysis of a sample was performed using a pycnometer with a volume of 100 mL, heated to 23°C.

[0161] The theoretical density of a formulation was calculated based on the raw material proportions and the density data of the raw materials.

[0162] To determine the Pump resistance The density of a test formulation was first measured immediately after preparation, and a second time after an identical sample had been pumped through a drum pump at a pressure of 30 bar (pressure peak during the dosing stroke). A deviation of 5% or less between the two density measurements indicates satisfactory pump stability. Thread pull The length in mm describes the length of the sealant filament that remains after the nozzle is lifted from the applied sealant bead following application from an applicator gun. A shorter filament is preferred. Production of polymer P and thixotropic agent 1 Production of the silane-functional polymer STP-1

[0163] Under exclusion of moisture, 1000 g of polyol Acclaim® < 12200 (from Covestro; low monol polyoxypropylenediol, OH number 11.0 mg KOH / g, water content approx. 0.02 wt%), 43.6 g of isophorone diisocyanate (Vestanat® < IPDI from Evonik Industries), 126.4 g of triethylene glycol bis(2-ethylhexanoate) (Solusolv® < 2075 from Eastman Chem.) and 0.12 g of dibutyltin dilaurate were heated to 90°C with continuous stirring and kept at this temperature until the titrimetrically determined content of free isocyanate groups reached a value of 0.63 wt%. Subsequently, 62.3 g of N-(3-trimethoxysilylpropyl)aminosuccinic acid diethyl ester (adduct of 3-aminopropyltrimethoxysilane and diethyl maleate; prepared according to US 5,364,955) were mixed in, and the mixture was stirred at 90°C until no free isocyanate was detected by FT-IR spectroscopy. The silane-functional polymer was cooled to room temperature and stored away from moisture. Production of the thixotropic agent 1

[0164] In a vacuum mixer, 1000 g of hydrogenated diisononyl phthalate (Hexamol® < DINCH, BASF) and 160 g of 4,4'-diphenylmethane diisocyanate (Desmodur® < 44 MC L, Bayer MaterialScience AG, Germany) were placed and gently warmed. Then, 90 g of monobutylamine were slowly added dropwise while stirring vigorously. The resulting white paste was stirred for one hour under vacuum and cooling. Thixotropic agent 1 contains 20 parts by weight of this reaction product and 80 parts by weight of diisodecyl phthalate. Production of moisture-curing compositions

[0165] Comparative examples are marked "(Ref.)" in Tables 2 to 5. The raw materials used are described in Table 1. Raw materials used

[0166] Table 1: Raw materials used in the example formulations. raw material Manufacturer / Description Polymer STP-1 Silane-functional polymer; see above for production. Plasticizer 1 Diisodecyl phthalate (Jayflex ®< DIDP; Exxon Mobil) Plasticizer 2 1,2-Cyclohexanedicarboxylic acid diisononyl ester (Hexamoll ®< DINCH; BASF) Inorganic filler F1 Titanium dioxide (Kronos® < 2500; Kronos) Inorganic filler F2 Pyrogenic silica (Cab-O-Sil ®< M5; Cabot) Inorganic filler F3 Ground calcium carbonate (Omyacarb ®< 5-GU; Omya) Soot Carbon black (Monarch ® < 570; Cabot) (dried) Microscopic hollow spheres H1 Hollow spheres made of borosilicate glass, density: 0.15 kg / L, isostatic compressive strength: 2.1 MPa, particle size D90: 105 µm, largest diameter: 115 µm (3M ®< Glass Bubbles K15; 3M) Microscopic hollow spheres H2 Hollow spheres made of borosilicate glass, density: 0.25 kg / L, isostatic compressive strength: 5.2 MPa, particle size D90: 95 µm, largest diameter: 105 µm (3M ®< Glass Bubbles K25; 3M) Microscopic hollow spheres H3 Hollow spheres made of borosilicate glass, density: 0.32 kg / L, isostatic compressive strength: 13.8 MPa, particle size D90: 80 µm, largest diameter: 85 µm (3M ®< Glass Bubbles K32; 3M) Microscopic hollow spheres H4 Hollow spheres made of borosilicate glass, density: 0.28 kg / L, isostatic compressive strength: 21.0 MPa, particle size D90: 55 µm, largest diameter: 65 µm (3M ®< Glass Bubbles S28HS; 3M) Microscopic hollow spheres H5 Hollow spheres made of aluminosilicate, density 0.6-0.7 kg / L, particle size 50-180 µm (Aeropor® < 180, SH Minerals) Microscopic hollow spheres H6 Hollow spheres made of aluminosilicate, density 0.7 kg / L, particle size 50-300 µm (Cenospheres ®< , SH Minerals) Microscopic hollow spheres H7 Expanded hollow spheres made of thermoplastic polymer, density 0.025 kg / L, compressive strength 1.2 MPa, particle size 35-55 µm (Expancel® < 461 DET d25, AkzoNobel) Thixotropic agent 1 Urea derivative; see above for production instructions. Thixotropic agent 2 Castor oil derivative (Thixatrol ®< ST; Elementis) Catalyst 1 Dibutyltin dilaurate (Sigma Aldrich) desiccant Vinyltrimethoxysilane (Silquest ®< A-171; Momentive) Liability mediator N-(2-Aminoethyl)-(3-aminopropyl)trimethoxysilane (Silquest ® < A-1110; Momentive) stabilizer HALS light stabilizer (Tinuvin® < 770 DF; BASF) Table 2: Compositions Z-1 to Z-4 in wt.%, each based on the total composition. composition Z-1 (Ref.) Z-2 Z-3 Z-4 Polymer STP-1 40.0 40.0 40.0 40.0 stabilizer 0.3 0.3 0.3 0.3 Plasticizer 1 9.18 9.18 9.18 9.18 desiccant 2.0 2.0 2.0 2.0 Inorganic filler F1 2.0 2.0 2.0 2.0 Thixotropic agent 1 25.0 25.0 25.0 25.0 Inorganic filler F2 2.0 2.0 2.0 2.0 Inorganic filler F3 6.5 6.5 6.5 6.5 Microscopic hollow spheres H1 11.0 - - - Microscopic hollow spheres H2 - 11.0 - - Microscopic hollow spheres H3 - - 11.0 - Microscopic hollow spheres H4 - - - 11.0 Liability mediator 2.0 2.0 2.0 2.0 catalyst 0.02 0.02 0.02 0.02 TOTAL 100 100 100 100 Test results Extrusion force (3mm) [N] 683 580 569 552 Thread pull [mm] 40 40 40 43 Tensile strength [MPa] 1.3 1.5 1.6 1.7 Elongation at break [%] 220 211 215 207 Density before pumping [kg / L] 0.64 0.79 0.85 0.84 Density after pumping [kg / L] 1.01 0.82 0.87 0.84 Pump resistance No Yes Yes Yes Table 3: Compositions Z-5 to Z-8 and Z-18 in wt.%, each based on the total composition. "n / m" means that the value was not measured. composition Z-5 Z-6 Z-7 Z-8 Z-18 (Ref.) Polymer STP-1 40.0 40.0 40.0 50.0 40.0 stabilizer 0.3 0.3 0.3 0.3 0.3 Plasticizer 1 9.27 9.27 9.27 15.95 17.7 desiccant 2.0 2.0 2.0 0.5 2.0 Inorganic filler F1 2.0 2.0 2.0 - 2.0 Thixotropic agent 1 25.0 25.0 25.0 - 25.0 Inorganic filler F2 2.0 2.0 2.0 - 2.0 Inorganic filler F3 8.4 9.4 10.4 9.1 - Soot - - - 18.5 - Microscopic hollow spheres H4 9.0 8.0 7.0 4.0 9.0 Liability mediator 2.0 2.0 2.0 1.5 2.0 Catalyst 1 0.03 0.03 0.03 0.15 0.02 TOTAL 100 100 100 100 100 Test results Extrusion force (3mm) [N] 507 481 462 n / m 352 Thread pull [mm] 37 32 40 39 51 Tensile strength [MPa] 1.7 1.7 1.7 5.5 1.1 Elongation at break [%] 218 225 236 230 216 Density before pumping [kg / L] 0.88 0.91 0.93 1.06 0.82 Density after pumping [kg / L] 0.88 0.90 0.93 1.05 0.82 Pump resistance Yes Yes Yes Yes Yes Table 4: Compositions Z-9 to Z-12 in wt.%, each based on the entire composition. "n / m" means that the value was not measured. composition Z-9 Z-10 Z-11 Z-12 Polymer STP-1 24.0 24.0 24.0 24.0 stabilizer 0.3 0.3 0.3 0.3 Plasticizer 1 10.1 10.1 10.1 10.1 Desiccant 1 1.5 1.5 1.5 1.5 Inorganic filler F1 2.0 2.0 2.0 2.0 Thixotropic agent 1 20.0 20.0 20.0 20.0 Inorganic filler F3 37.0 33.0 29.0 25.0 Microscopic hollow spheres H4 4.0 8.0 12.0 16.0 Liability mediator 1.0 1.0 1.0 1.0 Catalyst 1 0.1 0.1 0.1 0.1 TOTAL 100 100 100 100 Test results Extrusion force (3mm) [N] 535 587 n / m n / m Thread pull [mm] 30 37 28 33 Tensile strength [MPa] 2.0 2.0 2.0 2.1 Elongation at break [%] 255 196 158 139 Density before pumping [kg / L] 1.17 1.01 0.90 0.81 Density after pumping [kg / L] 1.19 1.00 0.90 0.81 Pump resistance Yes Yes Yes Yes Table 5: Compositions Z-13 to Z-17 in wt.%, each based on the total composition. * Significant leakage when dispensing from the cartridge with Z-17 composition Z-13 (Ref.) Z-14 (Ref.) Z-15 Z-16 Z-17 (Ref.) Polymer STP-1 17.5 17.5 21.0 21.0 17.5 Plasticizer 2 31.21 31.21 31.5 31.5 31.56 desiccant 1.5 1.5 1.5 1.5 1.5 Thixotropic agent 2 1.75 1.75 1.75 1.75 1.75 Inorganic filler F3 31 31 35.21 34.25 38.25 Microscopic hollow spheres H2 - - 8.0 - - Microscopic hollow spheres H4 - - - 8.96 - Microscopic hollow spheres H5 16 - - - - Microscopic hollow spheres H6 - 16 - - - Microscopic hollow spheres H7 - - - - 1.0 Liability mediator 1.0 1.0 1.0 1.0 1.0 Catalyst 1 0.04 0.04 0.04 0.04 0.04 TOTAL 100 100 100 100 100 Test results Tensile strength [MPa] 0.86 0.83 1.31 1.57 1.07 * Elongation at break [%] 129 117 146 166 175 * Density calculated [kg / L] 1.13 1.13 0.97 0.97 0.88 * Density measured fresh [kg / L] 1.24 1.12 0.97 0.97 1.00 * Density measured after 6 months RT [kg / L] 1.24 1.12 0.97 0.97 1.02 * Production of STP compositions Z-1 to Z-18

[0167] In a vacuum mixer, the silane-functional polymer STP-1, plasticizer, and desiccant were thoroughly mixed for 5 minutes according to the weight proportions specified in Tables 2 to 5. The respective fillers, microscopic hollow spheres, and thixotropic agents were then kneaded in for 15 minutes at 60°C. With the heating switched off, adhesion promoter, catalyst, and, if necessary, stabilizer were added, and the mixture was processed under vacuum for 10 minutes to form a homogeneous paste. This paste was then filled into internally coated aluminum expanding-flap cartridges and, after storage, used for the test specimens. The exact quantities (in wt.%, based on the total respective composition) of the individual raw materials for the respective tests are shown in Tables 2 to 5.

[0168] The measurement results in Tables 2 to 5 clearly show that the compositions according to the invention are superior to the non-inventive examples with regard to high tensile strength, low extrusion force, low stringing, pump stability and consistently low density.

Claims

1. Moisture-curing composition comprising a) at least one moisture-reactive polymer P in a proportion of 10% to 60% by weight, based on the total composition, b) at least one inorganic filler F in a proportion of at least 9% by weight, based on the total composition, c) between 3% and 25% by weight, based on the total composition, of at least one type of hollow microsphere H, characterized in that the composition has a density of less than 1.20 kg / L, preferably less than 1.10 kg / L, and the hollow microspheres H have a compressive strength, measured in accordance with ASTM D3102-72, of at least 2.5 MPa, preferably at least 5 MPa, and the hollow microspheres H have a volume-based particle size D90, measured with a Coulter counter, of less than 100 µm.

2. Moisture-curing composition according to Claim 1, characterized in that the hollow microspheres H are hollow glass spheres having a diameter of not more than 110 µm.

3. Moisture-curing composition according to Claim 1 or 2, characterized in that the at least one inorganic filler F is selected from the list consisting of precipitated or ground chalk, precipitated or fumed silica, titanium dioxide, or combinations of said fillers.

4. Moisture-curing composition according to any of Claims 1 to 3, characterized in that the moisture-reactive polymer P comprises at least one polyurethane polymer PU, wherein the polyurethane polymer PU has free or latent isocyanate groups and the composition in addition optionally comprises a latent curing agent for isocyanate groups.

5. Moisture-curing composition according to any of Claims 1 to 3, characterized in that the moisture-reactive polymer P comprises at least one silane-functional polymer STP.

6. Moisture-curing composition according to Claim 5, characterized in that the silane-functional polymer STP has end groups of the formula (II) where R14 is a linear or branched monovalent hydrocarbyl radical having 1 to 5 carbon atoms; R15 is a linear or branched monovalent hydrocarbyl radical having 1 to 8 carbon atoms; x has a value of 0 or 1 or 2; R16 is a linear or branched divalent hydrocarbyl radical having 1 to 12 carbon atoms that optionally has cyclic and / or aromatic moieties and optionally one or more heteroatoms, especially one or more nitrogen atoms; and T is a divalent radical selected from -0-, -S-, -N(R17)-, -O-CO-N(R17)-, -N(R17)-CO-O- and -N(R17)-CO-N(R17)-, where R17 is a hydrogen radical or a linear or branched hydrocarbyl radical having 1 to 20 carbon atoms that optionally has cyclic moieties and that optionally has an alkoxysilane, ether or carboxylic ester group.

7. Moisture-curing composition according to any of Claims 1 to 6, characterized in that the composition additionally comprises at least one additive, wherein the additive is selected from the list consisting of plasticizers, curing catalysts, stabilizers, thixotropic agents, adhesion promoters, and desiccants.

8. Moisture-curing composition according to any of Claims 1 to 7, characterized in that the composition contains at least 25% by weight of inorganic filler F, based on the total composition.

9. Moisture-curing composition according to any of Claims 1 to 7, characterized in that the composition additionally contains between 1% and 25% by weight of carbon black, based on the total composition.

10. Moisture-curing composition according to any of Claims 1 to 7, characterized in that the composition comprises 9% to 15% by weight of inorganic filler F, based on the total composition, and also comprises 5% to 15% by weight of hollow microspheres H, based on the total composition.

11. Use of a moisture-curing composition according to any of Claims 1 to 10 as an adhesive, sealant or coating for sound insulation and / or heat insulation.

12. Use of a moisture-curing composition according to any of Claims 1 to 10 as an adhesive, sealant or coating having fire retardant properties, said composition achieving fire retardancy class C (s2, d0) as defined in DIN EN 13501-1 after curing.

13. Use of a moisture-curing composition according to any of Claims 1 to 10 as an adhesive, sealant or coating for weight reduction.

14. Built structure or article of manufacture that has been bonded, sealed or coated with an adhesive, sealant or a coating according to Claim 13.

15. Cured composition according to any of Claims 1 to 10.