Composition for the preparation of silicone rubber masses

Abstract

Composition comprising- at least one organosilicone compound, at least one crosslinking agent and a catalyst, the catalyst comprising a metal salt of a carboxylic acid, which is a zinc salt of one or more branched saturated carboxylic acids with six to nineteen carbon atoms, and a metal salt of a carboxylic acid, which is selected from a bismuth salt, a calcium salt, a potassium salt, a lithium salt, a magnesium salt and a sodium salt in each case of one or more branched saturated carboxylic acids with six to nineteen carbon atoms.

Description

Composition for the preparation of silicone rubber masses The present invention relates to a catalyst for crosslinking silicone rubber masses. In particular, the present invention provides a composition for preparing a silicone rubber mass, the composition comprising this catalyst. Furthermore, the present invention provides a use of the catalyst for crosslinking a silicone rubber mass, as well as a use of the composition according to the invention for preparing a silicone rubber mass, particularly for use as a sealant, adhesive, or coating agent. Background of the invention Cold-curing silicone rubber compounds, also known as RTV (room temperature curing) silicone rubber compounds, have long been recognized as custom-made materials with elastic properties. They are generally used as sealants or adhesives for glass, porcelain, ceramics, stone, plastics, metals, wood, etc., for example as joint compounds or sealants in construction and the healthcare sector, or as coating materials, for example in the electronics industry (Rompp Chemie Lexikon, CD ROM, version 2.0, ed. J. Falbe, Thieme-Verlag, Stuttgart 1999 as well as Ullmanns Enzyklopadie der Technischen Chemie, 4th edition, ed. E. Bartholome, Verlag Chemie, Weinheim 1982, vol. 21, p. 511 et seq.).In particular, one-component RTV silicone rubber compounds (RTV-1) are used; these are, for example, plastically moldable mixtures of α,ε-dihydroxypolyorganosiloxanes and suitable crosslinking agents (also referred to technically as crosslinking agents or hardening agents), which can be stored in a moisture-free environment (e.g., in a suitable cartridge), yet polymerize under the influence of water or atmospheric humidity at room temperature. Polymerization is generally carried out by the condensation of SiOH groups with suitable hydrolyzable SiX groups of the crosslinking agents. Depending on the desired chemical and physical properties of the polymerization product, such as the desired degree of crosslinking, solvent resistance, etc., various polyfunctional crosslinking agents (hardening agents), for example tri- and / or tetrafunctional, are generally used in conjunction with various difunctional polyorganosiloxane compounds or compounds containing several functional groups. In this regard, α,μ-dihydroxypolyorganosiloxanes are particularly frequently used as difunctional polyorganosiloxane compounds. RTV-1 silicone rubber compounds are classified by means of the leaving groups (HX) released during the hydrolysis of the crosslinking agent into acidic systems (HX = acids, such as acetic acid, etc.), basic systems (e.g., HX = amines, etc.), and neutral systems (e.g., HX = alcohols, oximes, etc.). Currently available RTV-1 silicone rubber compounds generally contain either acid-crosslinking systems, which hydrolyze with the release of acetic acid, or neutral-crosslinking systems, which hydrolyze with the addition of oxime compounds, such as butan-2-onaoxime (or methyl ethyl ketoxime, MEKO). For the desired broad application of the silicone rubber compounds, they had to adhere to as many surfaces as possible, such as wood, lacquered wood, varnished wood, metals (such as steel, aluminum, and powder-coated aluminum), glass, plastics (such as polyvinyl chloride, PVC, and polyamide), concrete, etc. Furthermore, the silicone rubber compounds had to be stable during storage in a standard cartridge; that is, their properties had to remain unchanged over time, whether in a sealed cartridge after filling or in an opened and / or partially emptied cartridge. Finally, the polymerization product after the silicone rubber compound had fully cured had to be transparent or clear. In addition to the appropriate selection of the polymer components themselves, such as crosslinking agent and polyorganosiloxane, a catalyst is generally added to control the polymerization rate and / or degree of polymerization. This catalyst influences important product properties of silicone rubber compounds, such as skin formation time (i.e., the time it takes for a complete first skin to form on an applied compound), tack-free time (i.e., the time after which the compound is no longer sticky), complete cure (i.e., the time it takes for polymerization to be complete), etc. For example, industrial silicone sealant compounds may require a skin formation time of 5 to 15 minutes, a tack-free time of 15 to 120 minutes, and a complete cure of up to 7 days with an application thickness of 10 mm.Further information regarding skin formation time, adhesive-free time and complete curing can be taken, for example, from "Praxishandbuch Dichtstoffe" (3rd edition 1990), which was published by Industrieverband Dichtstoffe eV (IVD). An organometallic catalyst has been used until now as a catalyst for silicone rubber masses, as is commonly done for condensation-crosslinking polysiloxanes, in particular a catalyst based on an organotin compound, such as an alkyltin carboxylate, specifically dibutyltin dilaurate and dioctyltin dilaurate. However, organotin compounds of this type have toxicological properties that have led to restrictions on their use in commercially available products (see EU Directive 76 / 769 / EEC of 28 / 05 / 2009). Instead, another catalyst, which does not comprise any organotin compound, has been used in the state of the art so far for the crosslinking of polysiloxanes. For example, a titanium-based compound can be used as a catalyst, as described, for example, in documents EP 1230298 A1 and EP 2290007 A1. However, it is known that a catalyst based on a titanium compound can lead to yellowing and / or surface stickiness in the products, as well as exhibiting a slow vulcanization rate, insufficient storage stability, and incompatibility with common aminosilane-based adhesives. Furthermore, EP 1230298 A1 describes a catalyst based on amines and metallic salts of tin, zinc, iron, lead, barium, and zirconium, as well as tin chelates. This catalyst leads to products with a low yellow coloration; however, according to EP 2290007 A1, it is a slow catalyst. Therefore, EP 2 290 007 A1 proposes a catalyst based on metal compounds from major and minor groups I and II, namely Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Cu, Ag, Au, Zn, Cd, and Hg, in the form of pure carboxylates, which, with the addition of an acid co-catalyst in the form of an organic or inorganic acid, results in a product with acceptable curing development. EP 2290 007 A1 describes the use of this catalyst in silicone rubber compounds with crosslinking agents (hardening agents) that emit acidic (acetic acid) or neutral (alcohols or MEKO) compounds during hydrolysis, particularly with the use of a Li carboxylate or Sr carboxylate catalyst. The use of a catalyst based on Li, Na, K, Mg, Ca, Sr compounds without the simultaneous additional use of an acid cocatalyst is described in EP 2280041 A1. It is further described therein that, in particular, the use of lithium Octasoligen or strontium Octosoligen in combination with alkoxy-, acetoxy- or oximo-RTV-1 results in products with desired properties. Objective of the invention The inventors of the present invention have found, however, that it is not possible to use the previously described tin-free catalysts in conjunction with known silicone rubber compounds, which have been optimized using organotin compound-based catalysts, to obtain the desired product properties of the silicone rubber compounds. Simply substituting a tin-based catalyst with one of the known tin-free catalysts does not result in any product (RTV-1) with the desired properties. Thus, it was found that the sealant compounds prepared with the known tin-free catalysts exhibit poor adhesion and insufficient storage stability. In particular, with acetate crosslinking agents, insufficient complete curing was also observed. Therefore, one objective of the invention is to provide an improved catalyst for silicone rubber masses, which is not only tin-free, but also maintains all the desired properties for RTV-1 in product compositions that have been optimized with the use of organotin compound-based catalysts. The objective of the invention is achieved through the subject matter of the independent claims. Preferred embodiments are the subject matter of the dependent claims. Brief description of the invention To achieve the objective described above, the present invention provides: a catalyst for crosslinking silicone rubber masses; a composition for preparing a silicone rubber mass, the composition comprising this catalyst; a use of the catalyst for crosslinking a silicone rubber mass; and a use of the composition according to the invention for preparing a silicone rubber mass, in particular for use as a sealant, adhesive, or coating agent. Through detailed studies, the inventors of the present invention have surprisingly found that the objective of the invention can be achieved not by using a single tin-free compound as a catalyst in a mass of silicone rubber, as in the prior art, but by using a mixture of at least two tin-free compounds with catalytic activity. Such a mixture of unique catalysts has not been used until now; however, in addition to the toxicological advantages, it offers the further benefit of being easily adaptable to existing compositions. Detailed description of the invention The present invention provides a composition comprising at least one organosilicone compound, at least one crosslinking agent, and a catalyst. The composition according to the invention can be used for repairing a silicone rubber mass. The present invention uses a catalyst for crosslinking silicone rubber masses. The catalyst, which is contained in the composition according to the invention or used in the use according to the invention, comprises a metal salt of a carboxylic acid, which is a zinc salt of one or more branched saturated carboxylic acids with six to nineteen carbon atoms, and a metal salt of a carboxylic acid, which is selected from a bismuth salt, a calcium salt, a potassium salt, a lithium salt, a magnesium salt, and a sodium salt, in each case of one or more branched saturated carboxylic acids with six to nineteen carbon atoms. The catalyst, which is contained in the composition according to the invention or is used in the use according to the invention, is therefore a mixture of at least two different compounds, preferably from two to twenty different compounds, more preferably from two to eight different compounds, and especially preferably from two or three different compounds. Preferably, the catalyst comprises exactly two different metal salts of carboxylic acids. In this respect, these are preferably two metal salts of different metals. Preferably, the two metal salts of the carboxylic acids in the catalyst are in a ratio of the number of their respective metal atoms (numerical ratio) of 2:1 to 1:2, more preferably 1.3:1 to 1:1.3, more preferably 5:4 to 4:5, more preferably 1.2:1 to 1:1.2, even more preferably 1.1:1 to 1:1.1, and most preferably approximately 1:1. Each of the compounds included in the catalyst is a metallic salt of one or more carboxylic acids. The term "carboxylic acid" in this context designates an organic compound, preferably a hydrocarbon, with at least one carboxyl group (-COOH). Preferably, a carboxylic acid comprises a hydrocarbon having from 1 to 25 carbon atoms, preferably from 5 to 20 carbon atoms, and most preferably from 6 to 19 carbon atoms. The hydrocarbon of the carboxylic acid may be saturated, unsaturated, or aromatic, or may comprise corresponding bonds. The hydrocarbon of the carboxylic acid may comprise a linear or branched hydrocarbon chain, and / or hydrocarbon rings and / or suitable heteroatoms. Preferably, the carboxylic acid comprises a saturated hydrocarbon (alkane) having a linear or branched hydrocarbon chain. The carboxylic acid may comprise one or more carboxyl groups, preferably one, two, or three carboxyl groups. Monocarboxylic acids and dicarboxylic acids are especially preferred.In particularly preferred dicarboxylic acids, the two carboxyl groups are attached to adjacent carbon atoms. Monocarboxylic acids are especially preferred. A particularly preferred carboxylic acid is 2-ethylhexanoic acid. A "metal salt of a carboxylic acid" within the meaning of this invention is a compound comprising at least one carboxylate anion and at least one metal cation. The term "carboxylate anion" here refers to the anion formed by deprotonation of a carboxyl group of a carboxylic acid. Therefore, a carboxylate anion within the meaning of this invention is an organic compound, preferably a hydrocarbon, with at least one carboxylate group (-COO-), which can be formed from any of the carboxylic acids described above. The metal cation is a cation of the respective metal, preferably in a stable oxidation state under the application conditions. Accordingly, the metal cation preferably has a positive charge of +1 to +4, more preferably +1, +2, or +3. Examples of monovalent metal cations are K+, Li+, and Na+.Examples of a divalent metal cation (charge +2) are Ca2+, Mg2+, and Zn2+, and an example of a trivalent metal cation (charge +3) is Bi3+. For a neutrally charged compound, the charge of the metal cation can be balanced by the number of monovalently charged, negatively charged carboxylate groups. Thus, the ratio of metal cation to carboxylate group in the metal salt can increase, depending on the charge of the metal cation, to 1:1, 1:2, 1:3, etc., up to the maximum charge. For example, in the case of monocarboxylic acids, the metal-to-carboxylic acid ratio is 1:1 for monovalent metal cations, 1:2 for divalent metal cations, 1:3 for trivalent metal cations, and so on.In the case of dicarboxylic acids with two carboxylate groups, the ratio is adjusted accordingly, so that, for example, in the case of divalent metal cations, the metal-to-dicarboxylate ratio can be as high as 1:1, etc. The metal salt may contain carboxylate anions from a single carboxylic acid, or carboxylate anions from several different carboxylic acids. For example, the metal salt of a divalent metal cation may contain a carboxylate anion from a first carboxylic acid (R1-COO-) and a carboxylate anion from a second carboxylic acid (R2-COO-) different from the first. In addition to the metal cation and carboxylate anion(s), the metal salt of a carboxylic acid may also comprise other constituent parts, such as other anions that are not carboxylate anions, such as halide anions, nitrate anions, sulfate anions, or the like, or neutral molecules, such as solvate molecules, or the like. Most preferably, the metal salts of the carboxylic acids in the catalyst are comprised in a ratio of the numbers of the respective metal atoms (numerical ratio) of 2:1 to 1:2, more preferably 1.3:1 to 1:1, 3, more preferably 5:4 to 4:5, more preferably 1.2:1 to 1:1, 2, even more preferably 1.1:1 to 1:1, 1, and most preferably about 1:1. It was surprisingly found that a catalyst for crosslinking silicone rubber compounds, comprising at least two different metal salts of carboxylic acids as defined above, imparts particularly advantageous product properties in the preparation of silicone rubber compounds, particularly RTV-1 silicone rubber compounds. The catalyst can be used advantageously without requiring a co-catalyst. It was found that products with particularly advantageous properties can be obtained in this way. Anions of saturated carboxylic acids with six to ten carbon atoms are preferred. Anions of a carboxylic acid with a branched hydrocarbon chain of eight carbon atoms are especially preferred. One particularly preferred embodiment of a carboxylic acid is 2-ethylhexanoic acid. The catalyst, which is contained in the composition according to the invention or is used in the use according to the invention, comprises a metal salt of a carboxylic acid, which is a zinc salt of one or more branched saturated carboxylic acids with six to nineteen carbon atoms, and a metal salt of a carboxylic acid, which is selected from a bismuth salt, a calcium salt, a potassium salt, a lithium salt, a magnesium salt and a sodium salt in each case of one or more branched saturated carboxylic acids with six to nineteen carbon atoms. Most preferably, the metal salts of the carboxylic acids in the catalyst are comprised in a ratio of the number of zinc atoms of the zinc salt of a carboxylic acid to the number of metal atoms of the metal salt of a carboxylic acid (numerical ratio) of 2:1 to 1:2, more preferably 1.3:1 to 1:1, 3, more preferably 5:4 to 4:5, more preferably 1.2:1 to 1:1, 2, even more preferably 1.1:1 to 1:1, 1, and most preferably about 1:1. It was found that products with particularly advantageous properties can be provided in this way. More preferably, the catalyst, which is contained in the composition according to the invention or used in the use according to the invention, comprises a metal salt of a carboxylic acid, which is a zinc salt of one or more branched saturated carboxylic acids with six to nineteen carbon atoms, and a metal salt of a carboxylic acid, which is selected from a bismuth salt and a calcium salt in each case of one or more branched saturated carboxylic acids with six to nineteen carbon atoms. Preferably, the catalyst comprises a zinc salt of a branched carboxylic acid with six to ten carbon atoms in combination with a bismuth salt of a branched carboxylic acid with six to ten carbon atoms and / or a calcium salt of a branched carboxylic acid with six to ten carbon atoms. In a particularly preferred embodiment, the catalyst comprises a zinc salt of a branched carboxylic acid with eight carbon atoms in combination with a bismuth salt of a branched carboxylic acid with eight carbon atoms and / or a calcium salt of a branched carboxylic acid with eight carbon atoms. The catalyst, which is contained in the composition according to the invention or used in the use according to the invention, is zinc bis(2-ethylhexanoate). It has been found that zinc bis(2-ethylhexanoate) can provide products with particularly advantageous properties. The catalyst, which is contained in the composition according to the invention or used in the use according to the invention, is bismuth tris(2-ethylhexanoate). It has been found that bismuth tris(2-ethylhexanoate) can provide products with particularly advantageous properties. The catalyst, which is contained in the composition according to the invention or used in the application according to the invention, is preferably calcium bis(2-ethylhexanoate). It has been found that calcium bis(2-ethylhexanoate) can provide products with particularly advantageous properties. The catalyst, which is contained in the composition according to the invention or used in the use according to the invention, is sodium (2-ethylhexanoate). It has been found that products with particularly advantageous properties can be obtained with sodium (2-ethylhexanoate). Preferably, the catalyst, which is contained in the composition according to the invention or used in the use according to the invention, comprises a mixture of calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate). Preferably, a catalyst comprising calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate) is used, together with an oxime crosslinking agent. Preferably the catalyst comprises a mixture of calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate) in a ratio of 1:1 to 1:3 (weight ratio), more preferably in a ratio of 1:1 to 1:2, and most preferably 4:5. This corresponds to a numerical ratio of calcium bis(2-ethylhexanoate) to zinc bis(2-ethylhexanoate) of approximately 1, 1:1 to 1:2, 8, preferably of approximately 1, 1:1 to 1:1, 9, and most preferably of approximately 1:1, 2. It was found that with a catalyst comprising calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate), preferably in the ratio of 1:1 to 1:3 (weight ratio), products with particularly advantageous properties can be provided. It was found that with a catalyst comprising calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate), preferably in the ratio of, rounded, 1:1, in particular from approximately 1.3:1 to 1:1.3 (weight ratios), products with particularly advantageous properties can be provided. Preferably, the catalyst, which is contained in the composition according to the invention or used in the use according to the invention, comprises a mixture of sodium (2-ethylhexanoate) and zinc bis(2-ethylhexanoate). Preferably, a catalyst comprising sodium (2-ethylhexanoate) and zinc bis(2-ethylhexanoate) is used, together with an oxime crosslinking agent. Preferably the catalyst comprises a mixture of sodium (2-ethylhexanoate) and zinc bis (2-ethylhexanoate) in a ratio of 4:1 to 1:4 (weight ratio), more preferably in a ratio of 1:1 to 1:3, and most preferably 1:2. This corresponds to a numerical ratio of sodium (2-ethylhexanoate) to zinc bis (2-ethylhexanoate) of approximately 8.5:1 to 1:1.9, preferably approximately 2.1:1 to 1:1.4, and most preferably approximately 1:1.1. It was found that with a catalyst comprising sodium (2-ethylhexanoate) and zinc bis (2-ethylhexanoate), preferably in the ratio of 4:1 to 1:4 (weight ratio), products with particularly advantageous properties can be provided. It was found that with a catalyst comprising sodium (2-ethylhexanoate) and zinc bis(2-ethylhexanoate), preferably in the ratio of, rounded, 1:1, in particular from approximately 1.3:1 to 1:1.3 (weight ratios), products with particularly advantageous properties can be provided. Preferably, the catalyst, which is contained in the composition according to the invention or used in the use according to the invention, comprises a mixture of bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate). Preferably, a catalyst comprising bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate) is used, together with an acetate crosslinking agent and / or an alkoxy crosslinking agent. Preferably the catalyst comprises a mixture of bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate) in a ratio of 4:1 to 1:4 (weight ratio), more preferably in a ratio of 2:1 to 3:1, and most preferably 7:3. This corresponds to a numerical ratio of bismuth tris(2-ethylhexanoate) to zinc bis(2-ethylhexanoate) of approximately 2.2:1 to 1:7, 3, preferably approximately 1.1:1 to 1:1, 7, and most preferably approximately 1.3:1. It was found that with a catalyst comprising bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate), preferably in the ratio of 4:1 to 1:4 (weight ratio), products with particularly advantageous properties can be provided. It was found that with a catalyst comprising bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate), preferably in the ratio of, rounded, 1:1, in particular from approximately 1.3:1 to 1:1.3 (weight ratios), products with particularly advantageous properties can be provided. A composition according to the invention comprises at least one organosilicone compound, preferably two, three, or more distinct organosilicone compounds. An organosilicone compound contained in the composition is preferably an oligomeric or polymeric compound. The polymeric organosilicone compound is preferably a difunctional polyorganosiloxane compound, most preferably a polyorganosiloxane with a terminal α,ε-dihydroxyl group. Polydiorganosiloxanes with a terminal α,ε-dihydroxyl group are particularly preferred, especially polydialkylsiloxane with a terminal α,ε-dihydroxyl group, polydialkenylsiloxane with a terminal α,ε-dihydroxyl group, or polydiarylsiloxane with a terminal α,ε-dihydroxyl group.In addition to homopolymeric polydiorganosiloxanes with terminal α,ε-dihydroxyl groups, heteropolymeric polydiorganosiloxanes with α,ε-dihydroxyl groups and different organic substituents can also be used. These include copolymers of monomers with organic substituents of the same type on a silicon atom, as well as copolymers of monomers with different organic substituents on a silicon atom, for example, those with mixed alkyl, alkenyl, and / or aryl substituents. The preferred organic substituents comprise linear and branched alkyl groups with 1 to 8 carbon atoms, in particular methyl, ethyl, n- and isopropyl, and n-, sec- and tert-butyl, vinyl, and phenyl groups. In this respect, in individual organic substituents, individual hydrogen atoms or all hydrogen atoms bonded to carbon may be substituted by common substituents, such as halogen atoms or functional groups such as hydroxyl and / or amino groups.Thus, polydiorganosiloxanes with terminal α, ε-dihydroxyl with partially fluorinated or perfluorinated organic substituents or polydiorganosiloxanes with terminal α, ε-dihydroxyl with organic substituents, substituted with hydroxyl and / or amino groups, on the silicon atoms can be used. Particularly preferred examples of an organosilicone compound are polydialkylsiloxanes with a terminal α,ε-dihydroxyl group, such as, for example, polydimethylsiloxanes with a terminal α,ε-dihydroxyl group, polydiethylsiloxanes with a terminal α,ε-dihydroxyl group, or polydivinylsiloxanes with a terminal α,ε-dihydroxyl group, as well as polydiarylsiloxanes with a terminal α,ε-dihydroxyl group, such as, for example, polydiphenylsiloxanes with a terminal α,ε-dihydroxyl group. In this respect, polyorganosiloxanes having a kinematic viscosity of 5,000 to 120,000 cSt (at 25 °C) are preferred, particularly those with a viscosity of 20,000 to 100,000 cSt, and especially preferably those with a viscosity of 40,000 to 90,000 cSt. Mixtures of polydiorganosiloxanes with different viscosities can also be used. A composition according to the invention comprises at least one crosslinking agent. Any known crosslinking agent may be used for this purpose. Crosslinking agents based on silane compounds with hydrolyzable acetate moieties and / or crosslinking agents based on silane compounds with hydrolyzable oxime moieties are preferred. In addition to the hydrolyzable acetate and / or oxime groups, the crosslinking agents may comprise non-hydrolyzable moieties, such as alkyl groups, alkenyl groups, alkynyl groups, aryl groups, and the like. The preferred non-hydrolyzable groups are methyl, ethyl, propyl, isopropyl, isobutyl, vinyl, phenyl, and the like. The silane compound used as a crosslinking agent preferably has the general formula SiXnY^-n), where X denotes the hydrolyzable groups and Y denotes the non-hydrolyzable groups, and n is an integer from 1 to 4. Preferably, a crosslinking agent comprises three (n = 3) or four (n = 4) hydrolyzable groups. Preferably the crosslinking agent is selected from silane compounds comprising acid moieties, in particular silane compounds with acetate moieties, and silane compounds comprising oxime moieties, in particular silane compounds with acetoneoxime groups, silane compounds with methyl-ethyl-ketoxime groups, silane compounds with methyl-propyl-ketoxime groups, silane compounds with methyl-isobutyl-ketoxime groups and / or silane compounds with methyl-isopropyl-ketoxime groups. Examples of preferred acetate crosslinking agents include methyl-triacetoxysilane, ethyl-triacetoxysilane, propyl-triacetoxysilane, vinyl-triacetoxysilane, phenyl-triacetoxysilane, tetraacetoxysilane, and the like. Acetate crosslinking agents can be used as a single compound, or as a mixture of two or more acetate crosslinking agents. In addition to mixtures consisting solely of acetate crosslinking agents, crosslinking agent mixtures may also be used that further comprise crosslinking agents based on silane compounds with hydrolyzable alkoxy groups. These silane crosslinking agents with hydrolyzable alkoxy groups are constituted similarly to acetate crosslinking agents, with each acetoxy group being substituted by an alkoxy group. During hydrolysis or polymerization (polycondensation), the alkoxy crosslinking agents release neutral alcohol molecules. Examples of preferred alkoxy groups include methoxy, ethoxy, propoxy, and similar groups.Examples of preferred alkoxy crosslinking agents include methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, vinyltrimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, propyltriethoxysilane, vinyltriethoxysilane, phenyltriethoxysilane, and the like. Examples of preferred oxime crosslinking agents include methyl-tris(acetoneoxime)silane, ethyltris(acetoneoxime)silane, propyl-tris(acetoneoxime)silane, vinyl-tris(acetoneoxime)silane, phenyltris(acetoneoxime)silane, tetra(acetoneoxime)silane, methyl-tris(methyl-ethyl-ketoxime)silane, ethyl-tris(methyl-ethylketoxime)silane, propyl-tris(methyl-ethyl-ketoxime)silane, vinyl-tris(methyl-ethyl-ketoxime)silane, phenyl-tris(methyl-ethylketoxime)silane, tetra(methyl-ethyl-ketoxime)silane, methyl-tris(methyl-propyl-ketoxime)silane, and ethyl-tris( (methyl-propyl ketoximo) silane, propyl-tris (methyl-propyl-ketoximo) silane, vinyl-tris (methyl-propyl-ketoximo) silane, phenyl-tris (methyl-propyl ketoximo) silane, tetra (methyl-propyl-ketoximo) silane, methyl-tris (methyl-isopropyl-ketoximo) silane, ethyl-tris (methyl-isopropyl ketoximo)silane, propyl-tris (methyl-isopropyl-ketoximo) silane, vinyl-tris (methyl-isopropyl-ketoximo) silane, phenyl-tris (methylisopropyl-ketoximo) silane,tetra(methylisopropylketoxime)silane, methyltris(methylisobutylketoxime)silane, ethyltris(methylisobutylketoxime)silane, propyltris(methylisobutylketoxime)silane, vinyltris(methylisobutylketoxime)silane, phenyltris(methylisobutylketoxime)silane, tetra(methylisobutylketoxime)silane, and the like. Oxime crosslinking agents can be used as a single compound, or as a mixture of two or more oxime crosslinking agents. The composition has been found to be able to be stored in the absence of moisture for periods of time exceeding 12 months and polymerizes under the influence of water or air humidity at room temperature. Preferably, a composition according to the invention, comprising an acetate crosslinking agent, comprises a catalyst comprising bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate). Preferably, a composition according to the invention, comprising an oxime crosslinking agent, comprises a catalyst comprising calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate), or a catalyst comprising sodium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate). In the presence of water or atmospheric moisture, the constituent parts—the crosslinking agent (hardening agent) and the organosilicone compound—of the composition according to the invention polymerize or condense, forming Si-O-Si bonds to yield silicone rubber masses. The polymerization products prepared using the composition according to the invention are stain-free, transparent, and clear. Therefore, the composition according to the invention can be used as a sealant, adhesive, coating agent, or similar application. Most preferably, the composition according to the invention comprises 40 to 90% by weight of the organosilicone compound, 1 to 15% by weight of the crosslinking agent, and 0.1 to 5.0% by weight of the catalyst, more preferably 0.5 to 2.0% by weight of the catalyst, the remainder in each case being made up of usual additives. If desired, the composition according to the invention may include other common additives. Common additives include fillers, colorants, plasticizers, thixotropic agents, wetting agents, adhesives, and others. Both reinforcing and non-reinforcing fillers can be used. Inorganic fillers are preferred, such as highly dispersed, pyrogenic, or precipitated silicic acids, carbon black, quartz powder, chalk, or metal salts or oxides, such as titanium oxides. A particularly preferred filler is a highly dispersed silicic acid, such as Cabot's Cabosil 150. Fillers such as highly dispersed silicic acids, especially pyrogenic silicic acids, can also be used as thixotropic agents. Metal oxides can also be used as colorants, for example, titanium oxides as white colorants. Fillers can also be surface-modified using conventional methods; for example, silicic acids can be hydrophobized with silanes. The plasticizers may consist of known polydiorganosiloxanes without terminal functional groups, which are therefore distinct from the organosilicone compounds used according to the invention, and / or liquid aliphatic or aromatic hydrocarbons, preferably those with molecular weights from approximately 50 to approximately 5000, which have low volatility and are sufficiently compatible with polysiloxanes. The plasticizers preferably have a kinematic viscosity of 1 to 5000 cSt (at 25 °C), particularly from 50 to 500 cSt, and especially preferably from 90 to 200 cSt. Examples of plasticizers include polydimethylsiloxanes with a viscosity of 90 to 120 cSt, particularly 100 cSt, paraffin oils, and polysubstituted alkylbenzenes. As wetting agents and / or adhesives (adhering agents), silane compounds with organic substituents bearing reactive groups on the silicon atom are preferably used, which differ from the organosilicone compounds used according to the invention, such as, for example, organosilanes with reactive amine, carboxylic acid, epoxy, or thiol groups. Particularly preferred examples include aminosilanes, such as aminoethylaminopropyl trialkoxysilanes.Specific examples of particularly preferred adhesive agents (adherents) are 3-aminopropyl-triethoxysilane, 3-aminopropyltrimethoxysilane, aminoethylaminopropyltrimethoxysilane, butylaminopropyl-triethoxysilane, butylaminopropyl-trimethoxysilane, propylaminopropyl-triethoxysilane, propylaminopropyltrimethoxysilane, N-cyclohexyl-3-aminopropyl-trimethoxysilane, N-cyclohexyl-3-aminopropyl-triethoxysilane, and silane co-oligomers with diamino / alkyl functionality, which can be obtained, for example, as Dynasylan 1146 from Degussa. Other oligomeric adhesive agents may also be used. In another aspect, the present invention provides a use of the composition according to the invention as a sealant, adhesive, coating agent, or similar. The composition is preferably used in construction as a sealant or adhesive, particularly for joints in building and civil construction, glass construction, and window construction (preferably), and in the healthcare sector. Other uses include machine construction, for example, in the automotive industry (preferably), the electrical industry, the textile industry, or in the construction of industrial plants. The composition according to the invention can be applied as an RTV silicone rubber compound, according to the desired application, onto a suitable substrate, where it then polymerizes under the influence of water or atmospheric humidity at room temperature. For example, the composition according to the invention is applied as a sealant to a joint to be sealed or similar. When used as an adhesive, the composition is applied to one or both parts to be joined, and then the parts are assembled. The composition according to the invention is characterized by excellent adhesion to all major materials, such as wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many others. The resulting polymer is transparent and exhibits advantageous elasticity and hardness.Furthermore, the composition according to the invention is characterized by a short skin-forming time, tack-free time, and early stress relief. Additionally, the composition according to the invention exhibits advantageous storage properties in the cartridge. In another aspect, the present invention provides a catalyst for crosslinking a silicone rubber mass, the catalyst comprising at least two distinct compounds, independently selected from metal salts of carboxylic acids. The catalyst used in the application according to the invention has been described in detail above. Preferably a catalyst is used, comprising at least one metal salt of a carboxylic acid, selected from bismuth tris(2-ethylhexanoate), calcium bis(2-ethylhexanoate), sodium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate). Preferably the catalyst used comprises calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate), preferably in a numerical ratio of 1.3:1 to 1:1.3. Preferably, a catalyst is used, comprising calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate), together with an oxime crosslinking agent. Preferably, the catalyst used comprises bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate), preferably in a numerical ratio of 1.3:1 to 1:1.3. Preferably, a catalyst is used, comprising bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate), together with an acetate crosslinking agent. Preferably the catalyst used comprises sodium (2-ethylhexanoate) and zinc bis (2-ethylhexanoate), preferably in a numerical ratio of 1.3:1 to 1:1.3. Preferably, a catalyst is used, comprising sodium (2-ethylhexanoate) and zinc bis (2-ethylhexanoate), together with an oxime crosslinking agent. Preferably, the catalyst is used for crosslinking a mass of silicone rubber, comprising at least one organosilicone compound and at least one crosslinking agent, the compounds described above being used as the at least one organosilicone compound and as the at least one crosslinking agent. Preferably, the organosilicone compound used comprises at least one polyorganosiloxane compound with a terminal α,ω-dihydroxyl group, in particular a polydialkylsiloxane with a terminal α,ω-dihydroxyl group. Preferably, the crosslinking agent used comprises at least one compound, selected from the group consisting of silane compounds comprising acid moieties, in particular silane compounds with acetate moieties, and silane compounds comprising oxime moieties, in particular silane compounds with acetoneoxime groups, silane compounds with methyl-ethyl-ketoxime groups, silane compounds with methyl-propyl-ketoxime groups, silane compounds with methyl-isobutyl-ketoxime groups, and / or silane compounds with methyl-isopropyl-ketoxime groups. Especially preferred are 0.1 to 5.0% by weight of catalyst with 40 to 90% by weight of organosilicone compound and 1 to 15% by weight of crosslinking agent. By using the described catalyst according to the invention, the crosslinking of a mass of silicone rubber can be advantageously controlled in a manner corresponding to a desired application, so that polymerization products with desired properties are formed. Examples The following metal salts of carboxylic acids are used in the examples and comparative examples, and can be obtained from various manufacturers, such as Gelest (Morrisville, USA). The sodium and potassium salts of 2-ethylhexanoic acid were purchased from Alfa Aesar GmbH & Co. KG, Karlsruhe, Germany. The bismuth salt of carboxylic acids is bismuth tris(2-ethylhexanoate), which is classified under CAS No. 67874-71-9. The calcium salt of carboxylic acids is calcium bis(2-ethylhexanoate), which is classified under CAS No. 68409-80-3. Potassium 2-ethylhexanoate, classified under CAS No. 3164-85-0, is used as the potassium salt of carboxylic acids. Lithium 2-ethylhexanoate, classified under CAS No. 15590-62, is used as the lithium salt of carboxylic acids. Sodium 2-ethylhexanoate, classified under CAS No. 19766 89-3, is used as the sodium salt of carboxylic acids. Strontium bis(2-ethylhexanoate) is used as the strontium salt of carboxylic acids, and is classified under CAS No. 2457-02-5. Zinc bis(2-ethylhexanoate) is used as the zinc salt of carboxylic acids, which is classified under CAS No. 85203 81-2. The other chemicals used in the examples and comparative examples can be obtained, for example, from the manufacturers listed below: polydimethylsiloxane (80000 cSt) from Wacker Chemie, Burghausen, Germany; polymethylsiloxane (100 cSt) from Dow Corning, Seneffe, Belgium; load (highly dispersed silicic acid) from the company Cabot Rheinfelden, Germany; aminopropyltriethoxysilane from the company Nitrochemie Aschau GmbH, Germany; adhesive agent (aminoethylaminopropyltrimethoxysilane-based co-oligomers) from Nitrochemie Aschau GmbH, Germany; adherent agent (diacetoxy-di-ferc-butoxysilane) from Nitrochemie Aschau GmbH, Germany; crosslinking agent mixtures from Nitrochemie Aschau GmbH, Germany. Measurement of the product properties of the prepared sealants Product properties such as skin formation time, tack-free time, early stress, complete cure, appearance, and Shore A hardness were determined for all sealants prepared according to standard procedures (see, for example, "Praxishandbuch Dichtstoffe" by Industrieverband Dichtstoffe eV, 3rd edition 1990). All measurements were performed under conditions of 23 °C and 50% humidity. To determine the skin formation time, the time at which a complete layer of solidified material (skin) was observed on the surface of a sample bead was measured. To determine the stickiness-free time, the time was measured at which the surface of a sample bead no longer showed stickiness. To determine early stress, a 10 mm high silicone strip was applied to a sheet metal strip. The load-bearing capacity was tested by bending the strip at a 90° angle. The time it took for the silicone strip to remain intact is recorded. To determine complete curing, the sealant is applied to a height of 4 mm on a glass plate and the duration of complete curing is measured up to the glass plate. To determine surface crosslinking (notch resistance), a 10 mm high strip of sealant is applied to a glass plate. After 24 hours under normal conditions (21 to 25 °C; 40 to 60% humidity), a notch is pressed into the surface. After 10 seconds, it is checked whether the notch is reversible. The appearance was determined by organoleptic testing. Shore A hardness was determined using a Zwick-Roell measuring device (designation: ASTM D 2240; DIN 53505; ISO 868). The respective sealant sample was applied to a height of 10 mm and stored for 7 days under normal conditions (23 °C / 50% humidity). The measurement was then taken after 7 days of storage under normal conditions. Example 1: Catalyst A A catalyst is prepared according to the invention, comprising calcium and zinc salts of carboxylic acids. For catalyst A, calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate) are mixed in a 4:5 ratio (weight ratio). Example 2: Catalyst B A catalyst is prepared according to the invention, comprising bismuth and zinc salts of carboxylic acids. For catalyst B, bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate) are mixed in a 7:3 ratio (weight ratio). Reference example 1: A silicone rubber mixture containing ordinary tin with oxime crosslinking agent is prepared according to the following formulation: 556.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 266.0 g of polydimethylsiloxane with viscosity 100 cSt 109.0 g highly dispersed silicic acid (filler) 50.5 g of crosslinking agent mixture 14.5 g of vinyl-tris (ethylmethyl ketoxime) silane and 36.0 g methyl-tris(ethylmethylketoxym)silane 18.0 g of 3-aminopropyltriethoxysilane (thixotropic agent) 4.0 g of dibutyltin laureate as a catalyst The sealant, after distribution in air: - a skin formation time of 10 min - a 30-minute stickiness-free time - an early request after 80 min - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 24 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. Reference example 1 illustrates the product properties of a currently common tin-containing sealant mixture. Comparative example 1: Sealant formulation 1 (with oxime crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 525.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 103.0 g highly dispersed silicic acid (filler) 42.0 g of crosslinking agent mixture 21.0 g of ethyl-tris (acetone oxyme) silane, 15.0 g of vinyl-tris (ethylmethyl ketoxime) silane and 6.0 g methyl-tris(ethylmethylketoxime)silane 13.0 g of sticking agent (based on aminoethylaminopropyltrimethoxysilane) 3.0 g zinc bis(2-ethylhexanoate) 1.0 g of 2-ethylhexanoic acid (co-catalyst) The sealant, after distribution in air: - a skin formation time of 7 min - a 20-minute stickiness-free time - an early request after 160 min - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 22 The sealant was also found to have good adhesion to wood, varnished wood, aluminum, and glass. Conversely, adhesion to powder-coated aluminum, PVC, polyamide, steel, and concrete is only moderate to poor. The sealant also exhibits insufficient storage stability in the cartridge. Even after 4 weeks of storage at 60°C in the cartridge, the sealant achieves only a Shore A hardness of 12 after 7 days of air curing. Furthermore, the sealant shows only moderate to poor adhesion to all substrates. Comparative example 2: Sealant formulation 1 (with oxime crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 525.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 103.0 g highly dispersed silicic acid (filler) 42.0 g of crosslinking agent mixture 21.0 g of ethyl-tris (acetone oxyme) silane, 15.0 g of vinyl-tris (ethylmethyl ketoxime) silane and 6.0 g methyl-tris(ethylmethylketoxime)silane 13.0 g of sticking agent (based on aminoethylaminopropyltrimethoxysilane) 2.9 g zinc bis(2-ethylhexanoate) 1.1 g of octylphosphonic acid (co-catalyst) The sealant, after distribution in air: - a skin formation time of 10 min - a stickiness-free time of 25 min - an early request after 250 min (not acceptable) - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 25 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, etc. However, the sealant exhibits insufficient storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the following parameters have worsened: - no resistance to notching after 24 h in air - Shore A hardness after 7 days in the air only 16 - yellowing of the sealant Comparative example 3: Sealant formulation 1 (with oxime crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 525.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 103.0 g highly dispersed silicic acid (filler) 42.0 g of crosslinking agent mixture 21.0 g of ethyl-tris (acetone oxyme) silane, 15.0 g of vinyl-tris (ethylmethyl ketoxime) silane and 6.0 g methyl-tris(ethylmethylketoxime)silane 13.0 g of sticking agent (based on aminoethylaminopropyltrimethoxysilane) 2.9 g strontium bis(2-ethylhexanoate) 1.1 g of octylphosphonic acid (co-catalyst) The sealant, after distribution in air: - a skin formation time of 13 min - a 30-minute stickiness-free time - an early request after 360 min (not acceptable) - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 25 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, etc. However, the sealant exhibits insufficient storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the following parameters have worsened: - no resistance to notching after 24 h in air - Shore A hardness after 7 days in the air only 17 - yellowing of the sealant Comparative example 4: Sealant formulation 1 (with oxime crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 525.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 103.0 g highly dispersed silicic acid (filler) 42.0 g of crosslinking agent mixture 21.0 g of ethyl-tris (acetone oxyme) silane, 15.0 g of vinyl-tris (ethylmethyl ketoxime) silane and 6.0 g methyl-tris(ethylmethylketoxime)silane 13.0 g of sticking agent (based on aminoethylaminopropyltrimethoxysilane) 2.9 g lithium 2-ethylhexanoate 1.1 g of octylphosphonic acid (co-catalyst) The sealant, after distribution in air: - a skin formation time of 13 min - a 30-minute stickiness-free time - an early request after 420 min (not acceptable) - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 25 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, etc. However, the sealant exhibits insufficient storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the following parameters have worsened: - no resistance to notching after 24 h in air - Shore A hardness after 7 days in the air only 15 - yellowing of the sealant Comparative example 5: Sealant formulation 1 (with oxime crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 525.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 103.0 g highly dispersed silicic acid (filler) 42.0 g of crosslinking agent mixture 21.0 g of ethyl-tris (acetone oxyme) silane, 15.0 g of vinyl-tris (ethylmethyl ketoxime) silane and 6.0 g methyl-tris(ethylmethylketoxime)silane 13.0 g of sticking agent (based on aminoethylaminopropyltrimethoxysilane) 4.0 g zinc bis(2-ethylhexanoate) The sealant, after distribution in air: - a skin formation time of 5 min - a stickiness-free time of 25 min - an early request after 280 min (not acceptable) - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 25 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, etc. However, the sealant exhibits insufficient storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the following parameters have worsened: - no resistance to notching after 24 h in air - Shore A hardness after 7 days in the air only 17 - yellowing of the sealant Comparative example 6: Sealant formulation 1 (with oxime crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 525.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 103.0 g highly dispersed silicic acid (filler) 42.0 g of crosslinking agent mixture 21.0 g of ethyl-tris (acetone oxyme) silane, 15.0 g of vinyl-tris (ethylmethyl ketoxime) silane and 6.0 g methyl-tris(ethylmethylketoxime)silane 13.0 g of sticking agent (based on aminoethylaminopropyltrimethoxysilane) 4.0 g bismuth tris(2-ethylhexanoate) The sealant, after distribution in air: - a skin formation time of 5 min - a stickiness-free time of 15 min - an early request after 300 min (not acceptable) - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 25 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, etc. However, the sealant exhibits insufficient storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the following parameters have worsened: - no resistance to notching after 24 h in air - Shore A hardness after 7 days in the air only 15 - yellowing of the sealant Comparative example 7: Sealant formulation 1 (with oxime crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 525.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 103.0 g highly dispersed silicic acid (filler) 42.0 g of crosslinking agent mixture 21.0 g of ethyl-tris (acetone oxyme) silane, 15.0 g of vinyl-tris (ethylmethyl ketoxime) silane and 6.0 g methyl-tris(ethylmethylketoxime)silane 13.0 g of sticking agent (based on aminoethylaminopropyltrimethoxysilane) 4.0 g calcium bis(2-ethylhexanoate) The sealant, after distribution in air: - a skin formation time of 5 min - an adhesive-free time of 18 min - an early request after 320 min (not acceptable) - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 25 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, etc. However, the sealant exhibits insufficient storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the following parameters have worsened: - no resistance to notching after 24 h in air - Shore A hardness after 7 days in the air only 14 - yellowing of the sealant Comparative example 8: Sealant formulation 2 (with oxime crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 525.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 103.0 g highly dispersed silicic acid (filler) 42.0 g of crosslinking agent mixture 21.0 g of vinyl-tris (ethylmethyl ketoxime) silane and 21.0 g methyl-tris(ethylmethylketoxime)silane 13.0 g of sticking agent (based on aminoethylaminopropyltrimethoxysilane) 2.0 g sodium (2-ethylhexanoate) The sealant, after distribution in air: - a skin formation time of 8 min - a 30-minute stickiness-free time - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 23 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, etc. However, the sealant exhibits insufficient storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the following parameters have worsened: - insufficient adherence - Shore A hardness after 7 days in the air only 5 From comparative examples 1 to 8, it is evident that it is not possible to prepare, using known tin-free catalysts, a sealant mass with oxime crosslinking agents that exhibits good product properties comparable to those of a conventional tin-containing sealant mass (e.g., reference example 1). In particular, sealant masses prepared with known tin-free catalysts exhibit poor adhesion to many materials and insufficient storage stability. Example 3: Sealant formulation 1 (with oxime crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 525.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 103.0 g highly dispersed silicic acid (filler) 42.0 g of crosslinking agent mixture 21.0 g of ethyl-tris (ethylmethyl ketoxime) silane, 15.0 g of vinyl-tris (ethylmethyl ketoxime) silane and 6.0 g methyl-tris(ethylmethylketoxime)silane 13.0 g of sticking agent (based on aminoethylaminopropyltrimethoxysilane) 2.0 g Catalyst A (from example 1) The sealant, after distribution in air: - a skin formation time of 12 min - a stickiness-free time of 23 min - an early request after 180 min - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 25 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. Furthermore, the sealant is characterized by its excellent storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the sealant still exhibits the same properties as in the initial distribution. Example 4: Sealant formulation 2 (with oxime crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 525.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 103.0 g highly dispersed silicic acid (filler) 42.0 g of crosslinking agent mixture 21.0 g of vinyl-tris (ethylmethyl ketoxime) silane and 21.0 g methyl-tris(ethylmethylketoxime)silane 13.0 g of sticking agent (based on aminoethylaminopropyltrimethoxysilane) 2.0 g Catalyst A (from example 1) The sealant, after distribution in air: - a skin formation time of 10 min - a 20-minute stickiness-free time - an early request after 140 min - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 26 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. Furthermore, the sealant is characterized by its excellent storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the sealant still exhibits the same properties as in the initial distribution. Example 5: Sealant formulation 2 (with oxime crosslinking agent) Three catalysts (A1 to A3) are prepared as examples of calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate). In this respect, the mixing ratio (weight ratio) of calcium bis(2-ethylhexanoate) to zinc bis(2-ethylhexanoate) is 1:1 in catalyst A1, 2:3 in catalyst A2, and 1:3 in catalyst A3. A silicone rubber mixture is prepared according to the formulation described in Example 4, adding 2.0 g of catalyst A in each case instead of 2.0 g of catalyst A, or 2.0 g of catalysts A1, A2, and A3. The sealant, after distribution in air: - a skin formation time of 6 min (A1, A2, A3) - an adhesive-free time of 30 min (A1) or 25 min (A2, A3) - complete curing after 24 h (A1, A2, A3) (notch resistance) - a transparent appearance - a Shore A hardness of 24 (A1) or 26 (A2, A3) In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. Furthermore, the sealant is characterized by its excellent storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the sealant still exhibits the same properties as in the initial distribution. Example 6: Sealant formulation 2 (with oxime crosslinking agent) Three catalysts (C1 to C3) are prepared as examples of sodium (2-ethylhexanoate) and zinc bis(2-ethylhexanoate). In this respect, the mixing ratio (weight ratio) of sodium (2-ethylhexanoate) to zinc bis(2-ethylhexanoate) is 4:1 in catalyst C1, 2:3 in catalyst C2, and 1:4 in catalyst C3. A silicone rubber mixture is prepared according to the formulation described in Example 4, adding 2.0 g of catalysts C1, C2, and C3 in each case instead of 2.0 g of catalyst A. The sealant, after distribution in air: - a skin formation time of 6 min (C1, C3) or 7 min (C2) - a stickiness-free time of 25 min (C1, C2, C3) - complete curing (notch resistance) after 24 h (C1, C2, C3) - a transparent appearance - a Shore A hardness of 24 (C1) or 25 (C2, C3) In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. Example 7: Sealant formulation 2 (with oxime crosslinking agent) A silicone rubber mixture is prepared according to the formulation described in Example 4, using instead of 2.0 g of catalyst A, 2.0 g of a catalyst of potassium (2-ethylhexanoate) and zinc bis (2-ethylhexanoate) in a 2:3 ratio. The sealant, after distribution in air: - a skin formation time of 6 min - a stickiness-free time of 25 min - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 25 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. Example 8: Sealant formulation 2 (with oxime crosslinking agent) A silicone rubber mixture is prepared according to the formulation described in Example 4, using instead of 2.0 g of catalyst A, 2.0 g of a lithium (2-ethylhexanoate) and zinc bis (2-ethylhexanoate) catalyst in a 2:3 ratio. The sealant, after distribution in air: - a skin formation time of 7 min - a stickiness-free time of 25 min - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 25 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. Unlike the sealants prepared in comparative examples 1 to 8, the sealants prepared with the catalyst according to the invention and oxime crosslinking agents are characterized not only by excellent product properties but also by excellent storage stability. The advantageous action of the catalyst according to the invention is, in this respect, independent of the composition used, the mixing ratio, and the crosslinking agents employed. A particularly advantageous catalyst comprises calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate). Catalyst A, in particular, was found to impart especially good properties to the prepared sealants, especially in combination with oxime crosslinking agents. No additional co-catalyst is required. Comparative example 9: Sealant formulation 3 (with acetate crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 562.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 79.0 g highly dispersed silicic acid (filler) 40.0 g of crosslinking agent mixture 28.0 g of propyl-triacetoxysilane and 12.0 g ethyl-triacetoxysilane 5.0 g of adhering agent (diacetoxy-di-ferc-butoxysilane) 2.9 g of zinc bis(2-ethylhexanoate) 1.1 g of octylphosphonic acid (co-catalyst) The sealant, after distribution in air: - a skin formation time of 11 min - a stickiness-free time of 75 min - an early request after 30 min - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 23 In addition, it was found that the sealant exhibits good adhesion to wood, lacquered wood, varnished wood, aluminum, glass, polyamide, steel, etc. However, the sealant exhibits insufficient storage stability in the cartridge. After 8 weeks of storage at room temperature in the cartridge, the following parameters have worsened: - adhesion-free time: 420 min - no resistance to notching after 24 h in air - an early request after 90 min Comparative example 10: Sealant formulation 3 (with acetate crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 562.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 79.0 g highly dispersed silicic acid (filler) 40.0 g of crosslinking agent mixture 28.0 g of propyl-triacetoxysilane and 12.0 g ethyl-triacetoxysilane 5.0 g of adhering agent (diacetoxy-di-ferc-butoxysilane) 4.0 g zinc bis(2-ethylhexanoate) The sealant, after distribution in air: - a skin formation time of 11 min - a stickiness-free time of more than five hours - an early request after more than five hours - no complete curing after 24 h (notch resistance) - a transparent appearance - a Shore A hardness of 22 Furthermore, the sealant was found to have good adhesion to aluminum, glass, polyamide, steel, etc. Conversely, adhesion is only worse on wood, lacquered wood, and varnished wood. The sealant also exhibits insufficient storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the following parameters have worsened: - adhesion-free time: more than 48 hours - no resistance to notching after 48 h in air - an early request after more than 48 h - Shore A hardness after 7 days in air only 15 Comparative example 11: Sealant formulation 3 (with acetate crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 562.0 g of a^-dihydroxyl-terminal polydimethylsiloxane with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with a viscosity of 100 cSt 79.0 g highly dispersed silicic acid (filler) 40.0 g of crosslinking agent mixture 28.0 g of propyl-triacetoxysilane and 12.0 g ethyl-triacetoxysilane 5.0 g of adhering agent (diacetoxy-di-ferc-butoxysilane) 4.0 g bismuth tris(2-ethylhexanoate) The sealant, after distribution in air: - a skin formation time of 7 min - a stickiness-free time of more than 5 hours - an early request after more than 5 hours - no complete curing after 24 h (notch resistance) - a transparent appearance - a Shore A hardness of 21 Furthermore, the sealant was found to have good adhesion to aluminum, glass, polyamide, steel, etc. Conversely, adhesion is only worse on wood, lacquered wood, and varnished wood. The sealant also exhibits insufficient storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the following parameters have worsened: - adhesion-free time: more than 48 hours - no resistance to notching after 48 h in air - an early request after more than 48 h - Shore A hardness after 7 days in air only 14 Comparative example 12: Sealant formulation 3 (with acetate crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 562.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 79.0 g highly dispersed silicic acid (filler) 40.0 g of crosslinking agent mixture 28.0 g of propyl-triacetoxysilane and 12.0 g ethyl-triacetoxysilane 5.0 g of adhering agent (diacetoxy-di-ferc-butoxysilane) 4.0 g calcium bis(2-ethylhexanoate) The sealant, after distribution in air: - a skin formation time of 9 min - a stickiness-free time of more than 5 hours - an early request after more than 5 hours - no complete curing after 24 h (notch resistance) - a transparent appearance - a Shore A hardness of 23 Furthermore, the sealant was found to have good adhesion to aluminum, glass, polyamide, steel, etc. Conversely, adhesion is only worse on wood, lacquered wood, and varnished wood. The sealant also exhibits insufficient storage stability in the cartridge. After 4 weeks of storage at 60 °C in the cartridge, the following parameters have worsened: - adhesion-free time: more than 48 hours - no resistance to notching after 48 h in air - an early request after more than 48 h - Shore A hardness after 7 days in air only 12 Comparative example 13: Sealant formulation 4 (with acetate and alkoxy crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 555.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 312.0 g of polydimethylsiloxane with viscosity 100 cSt 84.0 g highly dispersed silicic acid (filler) 45.0 g of crosslinking agent mixture 31.5 g of methyl-triacetoxysilane, 9.0 g of propyl-triacetoxysilane and 4.5 g methyltrimethoxysilane 2.5 g of adhering agent (diacetoxy-di-ferc-butoxysilane) 4.0 g lithium (2-ethylhexanoate) The sealant, after distribution in air: - a skin formation time of 6 min - a 30-minute stickiness-free time - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 16 Furthermore, the sealant was found to have only moderate adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. The sealant also exhibits insufficient stability when stored in the cartridge. After 4 weeks of storage at 60°C in the cartridge, no complete curing occurs. Correspondingly, no adhesion to substrates is observed. Comparative example 14: Sealant formulation 4 (with acetate and alkoxy crosslinking agent) A silicone rubber mixture is prepared according to the formulation described in comparison example 13, using 4.0 g of sodium (2-ethylhexanoate) as a catalyst instead of 4.0 g of lithium (2-ethylhexanoate). The sealant, after distribution in air, has: - a skin formation time of 6 min - a stickiness-free time of 28 min - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 1 Furthermore, the sealant was found to have only moderate adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. The sealant also exhibits insufficient stability when stored in the cartridge. After 4 weeks of storage at 60°C in the cartridge, no complete curing occurs. Correspondingly, no adhesion to substrates is observed. Comparative example 15: Sealant formulation 4 (with acetate and alkoxy crosslinking agent) A silicone rubber mixture is prepared according to the formulation described in comparison example 13, using 4.0 g of potassium (2-ethylhexanoate) as a catalyst instead of 4.0 g of lithium (2-ethylhexanoate). The sealant, after distribution in air: - a skin formation time of 5 min - a 30-minute stickiness-free time - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 16 In addition, it was found that the sealant exhibits only moderate adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. The sealant also exhibits insufficient storage stability in the cartridge. After 4 weeks of storage at 60°C in the cartridge, no complete curing occurs. Correspondingly, no adhesion to substrates is observed. From comparative examples 9 to 15, it is evident that it is not possible to prepare, using known tin-free catalysts, a sealant mass with acetate crosslinking agents that exhibits good product properties comparable to those of a typical tin-containing sealant mass (e.g., reference example 1). In particular, sealant masses prepared with known tin-free catalysts show poor adhesion to many materials and insufficient complete curing. Furthermore, these sealants exhibit insufficient storage stability. Example 9: Sealant formulation 3 (with acetate crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 562.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 313.0 g of polydimethylsiloxane with viscosity 100 cSt 79.0 g highly dispersed silicic acid (filler) 40.0 g of crosslinking agent mixture 28.0 g of propyl-triacetoxysilane and 12.0 g of methyl-triacetoxysilane 5.0 g of adhering agent (diacetoxy-di-ferc-butoxysilane) 4.0 g of catalyst B (from example 2) The sealant, after distribution in air: - a skin formation time of 12 min - a stickiness-free time of 25 min - an early request after 40 min - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 15 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. Furthermore, the sealant is characterized by its excellent storage stability in the cartridge. After 8 weeks of storage at 60 °C in the cartridge, the sealant still exhibits the same properties as in the initial distribution. Example 10: Sealant formulation 4 (with acetate and alkoxy crosslinking agent) A silicone rubber mixture is prepared according to the following formulation: 555.0 g of polydimethylsiloxane with a, w-dihydroxyl terminal with a viscosity of 80,000 cSt 312.0 g of polydimethylsiloxane with viscosity 100 cSt 84.0 g highly dispersed silicic acid (filler) 45.0 g of crosslinking agent mixture 31.5 g of methyl-triacetoxysilane, 9.0 g of propyl-triacetoxysilane and 4.5 g methyltrimethoxysilane 2.5 g of adhering agent (diacetoxy-di-ferc-butoxysilane) 4.0 g of catalyst B (from example 2) The sealant, after distribution in air: - a skin formation time of 15 min - a stickiness-free time of 27 min - an early request after 40 min - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 20 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. Furthermore, the sealant is characterized by its excellent storage stability in the cartridge. After 8 weeks of storage at 60 °C in the cartridge, the sealant still exhibits the same properties as in the initial distribution. Example 11: Sealant formulation 4 (with acetate and alkoxy crosslinking agent) Four catalysts (B1 to B4) are prepared as examples of bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate). In this respect, the mixing ratio of bismuth tris(2-ethylhexanoate) to zinc bis(2-ethylhexanoate) is 4:1 in catalyst B1, 1:1 in catalyst B2, 2:1 in catalyst B3, and 1:4 in catalyst B4. A silicone rubber mixture is prepared according to the formulation described in Example 10, adding instead of 4.0 g of catalyst B in each case 4.0 g of catalysts B1, B2, B3 and B4. The sealant, after distribution in air: - a skin formation time of 8 min (B1, B2, B3, B4) - an adhesive-free time of 25 min (B1, B2, B3) or 45 min (B4) - complete curing after 24 h (notch resistance) (B1, B2, B3, B4) - a transparent appearance - a Shore A hardness of 20 (B2, B3, B4) or 21 (B1) In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. Furthermore, the sealant is characterized by its excellent storage stability in the cartridge. After 8 weeks of storage at 60 °C in the cartridge, the sealant still exhibits the same properties as in the initial distribution. Example 12: Sealant formulation 4 (with acetate and alkoxy crosslinking agent) A silicone rubber mixture is prepared according to the formulation described in Example 10, using instead of 4.0 g of catalyst B, 4.0 g of a bismuth tris(2-ethylhexanoate) and sodium tris(2-ethylhexanoate) catalyst in a 2:1 ratio. The sealant, after distribution in air: - a skin formation time of 6 min - a stickiness-free time of 23 min - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 17 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. Example 13: Sealant formulation 4 (with acetate and alkoxy crosslinking agent) A silicone rubber mixture is prepared according to the formulation described in Example 10, using instead of 4.0 g of catalyst B, 4.0 g of a bismuth tris(2-ethylhexanoate) and calcium bis(2-ethylhexanoate) catalyst in a 1:1 ratio. The sealant, after distribution in air: - a skin formation time of 7 min - a stickiness-free time of 32 min - complete curing after 24 hours (indentation resistance) - a transparent appearance - a Shore A hardness of 17 In addition, the sealant was found to have good adhesion to wood, lacquered wood, varnished wood, aluminum, powder-coated aluminum, glass, PVC, polyamide, steel, concrete, and many other materials. Unlike the sealants prepared in comparative examples 9 to 15, the sealants prepared with the catalyst according to the invention with acetate crosslinking agents or acetate and alcohol crosslinking agents of examples 9 to 13 are characterized not only by excellent product properties but also by excellent storage stability. The advantageous action of the catalyst according to the invention is in this respect independent of the composition used, the mixing ratio, and the crosslinking agents used. A particularly advantageous catalyst comprises bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate). In particular, catalyst B was found to impart especially good properties in the prepared sealants, especially in combination with acetate crosslinking agents. No additional co-catalyst is required either.

Claims

1. A composition comprising at least one organosilicone compound, at least one crosslinking agent, and a catalyst, the catalyst comprising a metal salt of a carboxylic acid, which is a zinc salt of one or more branched saturated carboxylic acids with six to nineteen carbon atoms, and a metal salt of a carboxylic acid, which is selected from a bismuth salt, a calcium salt, a potassium salt, a lithium salt, a magnesium salt, and a sodium salt, in each case of one or more branched saturated carboxylic acids with six to nineteen carbon atoms.

2. Composition according to claim 1, characterized in that the ratio of the number of zinc atoms of the zinc salt of a carboxylic acid to the number of metal atoms of the metal salt of a carboxylic acid is from 2:1 to 1:2, preferably from 1.3:1 to 1:1.

3.

3. Composition according to any one of the preceding claims,characterized in that it comprises calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate), preferably in a numerical ratio of 1.3:1 to 1:1.3, or characterized in that it comprises bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate), preferably in a numerical ratio of 1.3:1 to 1:1.3, or characterized in that it comprises sodium (2-ethylhexanoate) and zinc bis(2-ethylhexanoate), preferably in a numerical ratio of 1.3:1 to 1:1.

3.

4. Composition according to any one of the preceding claims, characterized in that the organosilicone compound is a polyorganosiloxane compound with a terminal α,μ-dihydroxyl group, in particular a polydialkylsiloxane with a terminal α,μ-dihydroxyl group.

5. Composition according to any one of the preceding claims, characterized in that the crosslinking agent comprises at least one compound selected from the group consisting of silane compounds comprising acid moieties,in particular silane compounds with acetate moieties, and silane compounds comprising oxime moieties, in particular silane compounds with acetoneoxime groups, silane compounds with methyl-ethyl-ketoxime groups, silane compounds with methyl-propyl-ketoxime groups, silane compounds with methyl-isobutyl-ketoxime groups, and / or silane compounds with methyl-isopropyl-ketoxime groups.

6. Composition according to any one of the preceding claims, characterized in that the crosslinking agent comprises at least one silane compound with acetate moieties and one silane compound with alkoxy moieties.

7. Composition according to any one of the preceding claims, characterized in that it comprises from 40 to 90% by weight of the organosilicone compound, from 1 to 15% by weight of the crosslinking agent, and from 0.1 to 5% by weight of the organosilicone compound.0% by weight of the catalyst according to any one of claims 1 to 10.

8. Use of a composition according to any one of the preceding claims for the preparation of a silicone rubber mass, in particular for use as a sealant, adhesive, or coating agent.

9. Use of a catalyst for crosslinking a silicone rubber mass, the catalyst comprising a metal salt of a carboxylic acid, which is a zinc salt of one or more branched saturated carboxylic acids having six to nineteen carbon atoms, and a metal salt of a carboxylic acid, which is selected from a bismuth salt, a calcium salt, a potassium salt, a lithium salt, a magnesium salt, and a sodium salt, each of one or more branched saturated carboxylic acids having six to nineteen carbon atoms, characterized in that the catalyst comprises calcium bis(2-ethylhexanoate) and zinc bis(2-ethylhexanoate).preferably in a numerical ratio of 1.3:1 to 1:1.3, or characterized in that the catalyst comprises bismuth tris(2-ethylhexanoate) and zinc bis(2-ethylhexanoate), preferably in a numerical ratio of 1.3:1 to 1:1.3, or characterized in that the catalyst comprises sodium (2-ethylhexanoate) and zinc bis(2-ethylhexanoate), preferably in a numerical ratio of 1.3:1 to 1:1.

3.

10. Use according to claim 9, characterized in that the silicone rubber mass comprises at least one organosilicone compound, which is a polyorganosiloxane compound with a terminal α,ε-dihydroxyl group, in particular a polydialkylsiloxane with a terminal α,ε-dihydroxyl group.

11. Use according to claim 9 or 10, characterized in that the silicone rubber mass comprises at least one crosslinking agent, the crosslinking agent comprising at least one compound selected from the group consisting of silane compounds comprising acid moieties,in particular silane compounds with acetate moieties, and silane compounds comprising oxime moieties, in particular silane compounds with acetoneoxime groups, silane compounds with methyl-ethyl-ketoxime groups, silane compounds with methyl-propyl-ketoxime groups, silane compounds with methyl-isobutyl-ketoxime groups and / or silane compounds with methylisopropyl-ketoxime groups.

12. Catalyst comprising a metal salt of a carboxylic acid, which is a zinc salt of one or more branched saturated carboxylic acids having six to nineteen carbon atoms, and a metal salt of a carboxylic acid, which is selected from a bismuth salt, a calcium salt, a potassium salt, a lithium salt, a magnesium salt and a sodium salt, in each case of one or more branched saturated carboxylic acids having six to nineteen carbon atoms.