Silicone impression material with accelerated curing

Abstract

The invention relates to a curable composition, more particularly cross-linkable composition, comprising addition-cross-linkable terminal ethylene-group-containing polydialkyl siloxanes and Si-H-group-containing polydialkyl siloxanes having a specific Si-H group content in relation to ethylene groups.

Description

[0001] KDP12329WO March 11, 2024 Silicone impression material with accelerated setting The invention relates to a curable composition comprising addition-crosslinkable polydialkylsiloxanes containing at least two terminal ethylene groups and having a specific content of Si-H groups and optionally having a specific content of Si-H groups in a molar ratio to the compound of formula I. Dental impression materials are typically used to depict the spatial situation of the teeth and jaw. Depending on the type of impression, the impression material placed in an impression tray remains in the patient's mouth for varying lengths of time. Many patients find this step very unpleasant, as, among other things, breathing may be impaired. This can result in gagging or anxiety, and may lead to the impression being aborted.The aim is to accelerate the curing of an impression material and thus shorten its residence time in the patient's mouth. At the same time, a working time must be maintained in order to mix and apply the impression materials. Furthermore, a high degree of detail in the impression must be achieved. To achieve this, these impression materials must flow as well as possible to the tooth and surrounding tissue, even in a moist oral environment. WO 2013 / 025494 A1 discloses addition-curing silicone impression materials consisting of hydride-functional and vinyl-terminated siloxanes that crosslink under Pt catalysis. The impression materials heat up due to the addition of low-molecular-weight allylsilanes during the crosslinking process. These allylsilanes are also already added in US Pat. No. 7,700,712 B2. The cause of this heating is a reaction of the allylsilanes with the hydride-functional siloxanes contained in addition-curing silicones.WO 2013 / 025494 A1 states that this heating results in a shortened setting reaction. However, the added allylsilanes are associated with two inherent disadvantages due to their low molecular weight. The reaction of allylsilanes with hydride-functional siloxanes is very efficient, which, according to WO 2013 / 025494 A1, can result in a temperature increase of up to 20 °C. In our opinion, this is likely to be perceived as unpleasant or threatening by patients and can trigger feelings of pain, anxiety, or defensive reactions. Furthermore, the allylsilanes used are monofunctional and therefore cannot contribute to the formation of a silicone network, i.e., effective curing or crosslinking. KDP12329WO 11.March 2024 The object of the invention was to provide curable compositions of addition-curing polysiloxanes that set more quickly within a defined time window and yet are readily processable within this time window. In particular, the compositions should not exhibit an unpleasant temperature increase despite rapid setting. A temperature increase of greater than or equal to 10 °C is considered unpleasant. In addition, the impression materials should continue to exhibit high detail accuracy and flow well to the tooth and surrounding tissue in the moist oral environment. These objects were achieved by an addition-curing composition according to claim 1; preferred embodiments are disclosed in the subclaims and in more detail in the description. The invention also relates to a kit according to claim 17 comprising a 2K dispensing device comprising at least two cartridges, as well as the use according to claim 18.The present invention describes impression materials which, compared to the prior art, have a shortened setting time, in particular shorter time windows for the curing reaction, and preferably simultaneously exhibit a low temperature increase. Furthermore, the setting time t90 - t5 can be reduced by greater than or equal to 10%, in particular greater than 20%, compared with a modified reference example according to WO 2013 / 025494 A1 (base paste A, catalyst paste B) with a vinyl content of the polysiloxanes according to the inventive examples, wherein an advantageous processing time of well over one minute (industrial minute) can be set. The setting time according to the invention can be set to less than 0.9 minutes, wherein the temperature increase of the curable composition can advantageously be set to less than 7.5°C.It was found that for efficient network formation, i.e., a rapid curing reaction (t90 - t5) as the difference between setting time (t90) and processing window (t5), the composition must contain a content of specific polysiloxanes containing Si-H groups. A particularly efficient setting time (t90 - t5) after reaching the processing time (t5) can be achieved within a time of less than 0.85 minutes (industrial minutes) with a simultaneously sufficiently long processing time of greater than or equal to 1.25 minutes (industrial minutes) to optionally less than 1.80 minutes (industrial minutes) and a temperature increase of less than or equal to 10 °C, in particular less than or equal to 8 °C.It may be particularly preferred if a defined molar ratio of a monounsaturated compound to the Si-H groups is additionally set, in particular a molar ratio of greater than five, in particular greater than six, preferably greater than 6.5, further preferably greater than or equal to 6.9, of Si-H groups to C=C groups, in particular vinyl groups, of a monounsaturated compound, ie mol Si-H groups / mol C=C groups of a monounsaturated compound. The molar ratio is preferably greater than 5 to less than or equal to 15, in particular greater than or equal to 6, particularly preferably greater than or equal to 6.5, further preferably greater than or equal to 7 to less than or equal to 15. Curable composition according to the invention comprising addition-crosslinkable organofunctional polysiloxanes comprising i. addition-crosslinking polysiloxanes containing at least two terminal ethylene groups and ii.at least two polysiloxanes containing Si-H groups, wherein the polysiloxanes containing Si-H groups have a content of Si-H groups of 4.1 mmol / g to 15 mmol / g, and optionally comprising a hydrosilylation catalyst, wherein it comprises 3 to 25 wt. % of polysiloxanes containing Si-H groups with a content of Si-H groups of 4.1 to 15 mmol / g, based on the total composition of 100 wt. % of the curable composition. Particular preference is given to adjusting the content of hydride-functional polysiloxanes in relation to the polysiloxanes containing ethylene groups.Particularly preferred is that the polysiloxanes containing at least two Si-H groups are present with a content of Si-H groups of 4.1 mmol / g to 15 mmol / g in a molar ratio of Si-H groups of the polysiloxanes to ethylene groups of the polysiloxanes of 4:1 to 10:1, preferably of 5:1 to 10:1, particularly preferably of 6:1 to 10:1, wherein in particular the curable composition does not contain any monounsaturated compound of the formula I or the content of the monounsaturated compound of the formula I in the curable composition is from 0.001 to 0.5% by weight, in particular 0.1 to 0.5% by weight, wherein the total content of the composition is 100% by weight.Likewise preferred is an adjustment of the content of hydride-functional polysiloxanes by using at least two specific polysiloxane compositions with different contents of polysiloxanes containing at least two Si-H groups to adjust the network formation, wherein a polysiloxane composition has a content of Si-H groups of a polysiloxane composition (a first polysiloxane composition, PS1 synonymous with polysiloxane composition PS.b) a lower content of Si-H groups, in particular less than or equal to 4.0 mmol / g, preferably from 1 to 3.5 mmol / g, and a polysiloxane composition with a content of Si-H groups of 4.1 to 15 mmol / g (a second polysiloxane composition, PS2 synonymous with polysiloxane composition PS.a). The polysiloxane composition with greater than or equal to 4.1 mmol / g Si-H groups is preferably in a weight ratio of greater than 2, in particular KDP12329WO 11.March 2024 greater than or equal to 5, with respect to the polysiloxane composition having less than or equal to 4.0 mmol / g of Si-H groups. It is further preferred if the curable composition does not contain any monounsaturated compound of the formula I, or if the content of the monounsaturated compound of the formula I in the curable composition is from 0.001 to 0.5 wt. %, in particular 0.1 to 0.5 wt. %, in particular 0.1 to 0.03 wt. %, with the total content of the composition being 100 wt. %. Furthermore, it has proven advantageous if monounsaturated compounds are present in the composition, such as low molecular weight species, for example comprising monounsaturated compounds with H2C=CH-CH2-, H2C=C(CH3)-CH2- groups, or monounsaturated compounds of the formula I.It has been found that the presence of monounsaturated compounds in a molar ratio of Si-H groups to monounsaturated compound of greater than 5 accelerates crosslinking without causing an unpleasant temperature increase. According to a preferred embodiment, the addition-crosslinking polysiloxanes containing at least two terminal ethylene groups comprise polydialkylsiloxanes, polydialkylsiloxane ethers, or mixtures thereof, in particular with alkyl, each independently having 1 to 16 C atoms, preferably alkyl having 1 to 4 C atoms, particularly preferably methyl groups. According to a preferred embodiment, the composition preferably comprises substantially monounsaturated compound(s), in particular from 0.01% by weight to 0.4% by weight, in particular from 0.04 to 0.4% by weight, based on the total composition of the curable composition of 100% by weight.According to a preferred embodiment, the composition may comprise substantially monounsaturated compounds of formula I R. 2 R 3 C=CR 1 -A-SiR3 (I) with R each independently selected from H, monovalent alkyl group with 1 to 22 C atoms, aryl group with 16 to 12 C atoms, O-SiR 4 3-group, wherein R optionally comprises heteroatoms, with the proviso that R is not an alkoxy group or arylalkoxy group, KDP12329WO 11 March 2024 R 1 , R 2 , R 3 are each independently selected from H, monovalent alkyl group having 1 to 22 C atoms, aryl group having 6 to 12 C atoms and optionally each independently comprise heteroatoms, R 4 a monovalent alkyl group having 1 to 22 C atoms or aryl group having 6 to 12 C atoms, optionally containing two or three R 4 Residues in O-SiR 43 can form a cyclic or polycyclic structure, A is a bivalent linear, branched or cyclic hydrocarbon group having 1 to 12 C atoms, optionally comprising an aromatic having at least one methylene group which is directly covalently bonded to the aromatic, optionally comprising -O atoms, preferably A is methylene, ethylene, propylene, butylene, hexylene, octylene, nonylene or decylene, where the molar ratio of Si-H groups of the polysiloxanes containing Si-H groups to the monounsaturated compound of the formula I is greater than 5. In particular, the molar ratio of Si-H groups of the polysiloxanes containing Si-H groups to the C=C group of the monounsaturated compound of the formula I is greater than 5. Allylsilanes, in particular monofunctional and / or multifunctional allylsilanes, are organofunctional silicon compounds. Preferred allylsilanes do not contain Si-O-Si fragments and are therefore not siloxanes.Most preferably, the compositions contain monofunctional allylsilanes and tetraallylsilane, in particular in a ratio of 1:0 to 2:1. Preferred allylsilanes include R. 2 R 3 C=CH2-SiR3, R 2 R 3 C=C(CH3)CH2-SiR3, or R 2 R 3 C=CHCH2-SiR3 with R 2 and R 3 each being H, and / or mixtures comprising at least one of the allylsilanes with a tetraallylsilane. Alternatively, the compositions may be free of di-, tri-, or tetrafunctional allylsilanes or free of di-, tri-, and tetrafunctional allylsilanes. It is assumed that the processing time can be adjusted by a very specific addition of the compound of formula I in the molar ratio to the Si-H groups. Thus, by adding the compound of formula I, the onset of crosslinking can be delayed despite a very high Si-H content, and yet from t 5(min.) very fast networking (t 90 - t 5(min.)) with a short setting time can be achieved. In order to adjust the processing time and the subsequent crosslinking with pinpoint accuracy, a specific weight ratio of the polysiloxane composition containing Si-H groups with greater than or equal to 4.1 mmol / g Si-H groups and the monounsaturated compound of formula I of greater than 7 is preferred. Furthermore, it is preferred if the polysiloxane composition with greater than or equal to 4.1 mmol / g Si-H groups is preferably present in a weight ratio of greater than 2, in particular greater than or equal to 5, with respect to the polysiloxane composition with less than or equal to 4.0 mmol / g Si-H groups. In this respect, curing is correlated with the crosslinking reactions. According to the invention, the establishment of a specific ratio of hydride- and vinyl-functional siloxanes as well as of hydride-functional siloxanes to the monounsaturated compound of formula I is particularly crucial.Preferred monounsaturated compounds of formula I have a molecular weight of less than 500 g / mol, preferably less than 250 g / mol. For the additive crosslinking reaction of hydride-functional polysiloxanes, which are present in the base component, and vinyl-terminated polysiloxanes, which may be present in the base and catalyst components, these must be able to coordinate to a platinum catalyst. It has now been found that a specific ratio of at least two polysiloxane compositions, each with a defined molar content of Si-H groups, in a specific ratio to polysiloxanes with at least two terminal ethylene groups leads to accelerated curing (synonymous with curing, crosslinking, or setting reaction) of the addition-crosslinkable polysiloxane-containing composition.It was further found that increasing the reaction temperature to supposedly accelerate the addition reaction disproportionately delays the addition reaction due to the resulting competing reaction with the monounsaturated compound of formula I and leads to unfavorable setting behavior of the composition. The defined time window of the curing reaction is characterized by the time difference t90 – t5. t5 corresponds to the processing time, i.e. the point in time up to which an almost stress-free deformation of the impression material is still possible. The time t90 corresponds to the setting time. The defined time window of the curing reaction (t90 – t5) corresponds to the difference between setting time (t90) and processing time (t5), i.e. the point in time at which a large part of the network has formed and only minimal deformation of the material is possible. Ideally, the time difference t. 90– t5 is as short as possible, as the impression can be removed from the patient's mouth quickly. The times are determined by measuring the viscosity, in this case complex viscosity, of the mixed impression material at 30 °C using a rheometer. t5 corresponds to the time at which 5% of the final viscosity is reached. t 90 corresponds to the time at which 90% of the final viscosity is reached. The complex viscosity is measured every 30 seconds as soon as the sample of the KDP12329WO March 11, 2024 mixture of base paste and catalyst paste no longer sticks. The measurement ends after 10 minutes. The time period from t is used as the defined time window for the curing reaction or crosslinking. 90minus t5. The time period before reaching t5 is defined as the processing window. The term curable composition comprising addition-curable polysiloxanes is used synonymously with crosslinkable composition. The processing time is followed by the setting time and results in the defined time window of the curing reaction. Furthermore, it is preferred that the time t5 (synonymous with t5) is at least 0.75 minutes, preferably greater than or equal to 1 minute, particularly preferably greater than or equal to 1.3 minutes, particularly preferably from 1 to 1.6 minutes, which in this case always correspond to industrial minutes (industrial minutes, 60 minutes equal to 100 industrial minutes, ie = hrs + mins / 60 + secs / 3600).to prepare the mixture of base component and catalyst component, as well as apply the composition in the impression tray, insert the impression tray in the patient's mouth, and make optional adjustments. After correct placement of the impression tray in the patient's mouth, particularly rapid curing is desired. This rapid curing is indicated by the time difference t90 minus t5 in minutes. According to the invention, a composition is provided which has a time window for significantly faster additive curing of preferably less than 0.90 min. for (t90-t5) (min.), particularly preferably less than 0.7 min. (t90-t5) (min.), in particular less than 0.70 min. Thus, for the allyltrimethylsilane and optionally tetraallylsilane-containing compositions, time windows for the curing reaction (t90 - t5) of 0.61 minutes (allyltrimethylsilane in base paste) and 0.83 minutes (lower Si-H content). If polysiloxane compositions contain allylsilanes, in particular monofunctional and polyfunctional allylsilanes, a specifically tailored additive curing of the hydride-functional polysiloxanes and vinyl-terminated polysiloxanes results in comparison, with a processing time of more than one minute and subsequent very short crosslinking within less than 0.85 minutes (industrial minutes). The invention also relates to a curable composition comprising addition-crosslinkable organofunctional polysiloxanes, in particular selected from, KDP12329WO March 11, 2024 i. addition-crosslinking polysiloxanes containing at least two terminal ethylene groups, and ii. polysiloxanes containing at least two Si-H groups, in particular polyhydrogensiloxanes,wherein the polysiloxanes containing Si-H groups comprise at least two polysiloxane compositions with different contents of Si-H groups, wherein a first polysiloxane composition (PS1) has a content of Si-H groups of 1 to 3.5 mmol / g and a second polysiloxane composition (PS2) has a content of Si-H groups of 3.8 mmol / g to 15 mmol / g, in particular the first and second and optionally further polysiloxane compositions are present as a mixture, wherein the first polysiloxane composition (PS1) has a content of Si-H groups and the second polysiloxane composition (PS2) has a content of Si-H groups in a weight ratio of 1:1.5 to 1:10, in particular in a weight ratio of 1:1.8 to 1:6, and optionally the molar ratio of Si-H groups of the polysiloxanes to ethylene groups of the polysiloxanes is from 4 : 1 to 10 : 1,and optionally comprising a hydrosilylation catalyst. Preferred polysiloxanes containing at least two Si-H groups have terminal Si-H groups and optionally pendant Si-H groups. Preferred polysiloxanes containing at least two terminal ethylene groups can optionally additionally comprise pendant ethylene groups. Particularly preferably, polysiloxanes containing at least two terminal ethylene groups comprise terminal divinylpolysiloxanes, particularly preferably divinylpolydialkylsiloxanes, alkyl having 1 to 6 C atoms, particularly preferably divinylpolydimethylsiloxanes. Polysiloxanes containing Si-H groups can also be synonymously called polyhydrogensiloxanes. Preferred hydrosilylation catalysts include hydrosilylation catalysts containing platinum, rhodium, and / or palladium. A further preferred embodiment comprises a composition whose maximum temperature increase (^T) upon curing is less than or equal to 7 °C,wherein the temperature increase is carried out with a temperature sensor in the mass in the time interval 15 seconds from the first mixing to 10 minutes after the first mixing, wherein in particular a temperature measurement is carried out every 30 seconds. Furthermore, it is preferred if the value t5 in minutes from the first mixing corresponds to the complex viscosity of 5% and t90 in minutes corresponds to the complex viscosity of 90% of the complex viscosity 10 minutes from the first mixing, wherein t90 is less than or equal to 2.7 minutes, in particular less than or equal to 2.5 minutes, preferably less than or equal to 2.2 minutes, and / or t5 in minutes is less than or equal to 1.8 minutes, KDP12329WO 11 March 2024 in particular less than or equal to 1.7 minutes, preferably less than or equal to 1.6 minutes, and / or the value t, 90 -t5as difference of time from t 90of the complex viscosity with 90% of the complex viscosity and the time from t5 of the complex viscosity with 5% of the complex viscosity 10 minutes from the first mixing is less than or equal to 1 minute, in particular less than or equal to 0.9 minutes, particularly preferably less than or equal to 0.7 minutes. From the first mixing is to be understood as synonymous with after or from the start of mixing. Particularly preferred are the maximum temperature increase and t 90-t5 / min. is less than 0.9 minutes, preferably less than or equal to 0.7. The processing time t5 in minutes (industrial minutes), i.e. the time up to which an almost stress-free deformation of the impression material is still possible, is preferably less than or equal to 1.8 minutes, preferably less than or equal to 1.6 minutes, particularly preferably less than or equal to 1.5 minutes and preferably greater than or equal to 1 minute, wherein alternatively or additionally the time window of the curing reaction (t90 - t5) in minutes is less than or equal to 0.9 minutes, preferably less than or equal to 0.85 minutes, particularly preferably less than or equal to 0.7 minutes, wherein optionally at the same time the temperature increase is less than 7 °C. It is further preferred if the processing time t5 in minutes (industrial minutes) is greater than or equal to 0.75, in particular greater than or equal to 1.0, and less than or equal to 1.8, preferably less than or equal to 1.6. Without being bound to theory, it is assumed thatthat rapid setting combined with a good processing time results from a PS1 / PS2 weight ratio (PS1 = crosslinker with Si-H (synonym for SiH) 1.3 to 2.5 mmol / g and PS2 = crosslinker with Si-H 4.1 to 8 mmol / g) of 1:1.8 to 1:6 and a molar Si-H group to vinyl group ratio of 5 to 9.5, in particular of 6 to 9.3. The compositions according to the invention correspond to a free-flowing corrective impression material, but in principle, transfer to all consistencies (Type 3 - Type 0 according to DIN EN ISO 4823:2021, DIN EN ISO 4823:2021-06) is possible. Particularly preferably, in the composition or in a mixture of base component and catalyst component, in particular in a ratio of 5:1 to 1:5, preferably of 1:1 to 2:1 to 1:2, particularly preferably of 1:1, a molar ratio of Si-H groups of the polysiloxanes to ethylene groups of the polysiloxanes of 1:1,8 to 1:6 with a first polysiloxane composition (PS1) having a content of Si-H groups of 1.3 mmol / g to 2.5 mmol / g and a second polysiloxane composition (PS2) having a content of Si-H groups of 4 mmol / g to 8 mmol / g, in particular of 4.1 mmol / g to 8 KDP12329WO March 11, 2024 mmol / g, and optionally, wherein the ratio of terminal ethylene groups of the base component to terminal ethylene groups in the catalyst component is in a molar ratio of preferably 1:1.3 to 1:10, more preferably 1:1.4 to 1:2. Furthermore, a preferred composition can comprise a content of tetraallylsilane. Preferably, a composition of 0.001 to 1.0 wt.%, in particular of 0.001 to 0.5 wt.%, preferably of 0.001 to 0.3 wt.%,Tetraallylsilane in relation to the total composition of the curable composition of 100 wt.%. In a particularly preferred alternative, the curable composition does not comprise any tetraallylsilane. It has been found that a certain amount of tetraallylsilane can be advantageously added to the composition to extend the processing time to a certain extent, in particular without adversely affecting the additive curing in the time window t90-t5, so that, in summary, a good processing time of less than 2 minutes and a subsequent rapid curing of less than 1 minute can be achieved. The significant advantage of the invention is thus that, through the inventive ratio of at least two polysiloxanes containing terminal ethylene groups and at least two polysiloxanes containing Si-H groups, very rapid additive curing can be achieved within a time window.The time window can be adjusted to longer processing times by adding tetraallylsilane, while maintaining rapid curing, so that the total time from mixing to reaching 90% of the Shore A hardness can be less than 3 minutes. Furthermore, it is particularly preferred if a composition comprises at least one surfactant comprising a polyether, polyether-functionalized siloxane oligomer, fatty alcohol and / or fluorosurfactant or mixtures of the aforementioned surfactants. Preferred surfactants can optionally comprise at least one nonionic or ionic fluorosurfactant containing at least one fluoroalkyl group. Particularly preferably, a composition comprises at least one surfactant comprising a polyether and / or at least one polyether-functionalized siloxane oligomer or mixtures of the aforementioned surfactants. Preferred surfactants comprise polyether-functional siloxane surfactants and optionally a polyether,such as allyloxypolyethylene glycol alkyl ether, preferably allyloxypolyethylene glycol methyl ether, to adjust the hydrophilicity of the composition. Preferred surfactants include polyether-functionalized siloxane oligomers having at least one alkylsiloxane group and optionally a polyether. The additional surfactant particularly preferably comprises at least one polyether-alkylene-functionalized siloxane oligomer having at least one alkylsiloxane group. By definition, surfactants do not contain Si-H and / or ethylene groups. Surfactants are usually added, especially to addition-curing impression materials, to achieve increased hydrophilicity and thus facilitate flow onto moist surfaces. In addition to conventional nonionic surfactants, partially fluorinated and / or perfluorinated surfactants are also used in dental impression materials, sometimes in combination with conventional surfactants. The content of surfactant(s) in the composition can range from 0.01 to 0.50.1 to 10 wt. %, preferably from 0.1 to 7.5 wt. %, particularly preferably from 0.1 to 5 wt. %, further preferably from 1 to 3 wt. %, the total composition of the curable composition being 100 wt. %. The invention likewise provides a composition comprising addition-crosslinking polysiloxanes containing at least two terminal ethylene groups and having an ethylene group content of from 0.01 mmol / g to 10 mmol / g ethylene groups, in particular vinyl groups. In particular, the polysiloxanes containing at least two terminal ethylene groups comprise a mixture of polysiloxanes EP1 containing terminal ethylene groups and polysiloxanes EP2 containing terminal ethylene groups and having a vinyl group content of from 0.1 to 0.5 mmol / g. Preferably, the terminal ethylene group-containing polysiloxanes EP1 comprise polysiloxanes having a vinyl group content of 0.01 to 0.07 mmol / g and a viscosity of 100 mPa ^s to 20,000 mPa ^s (viscosity determination method: DIN 53015 Höppler, vinyl group content via FTIR spectroscopy using a calibration curve) and the terminal ethylene group-containing polysiloxanes EP2 with a vinyl group content of 0.1 to 0.5 mmol / g have a viscosity of 1,000 to 20,000 mPa ^s. The weight ratio of EP1 to EP2 is preferably in the range from 10:1 to 1:10, preferably from 5:1 to 1:2. It is further preferred if the weight ratio of EP1:EP2 in the base component is from 5:1 to 2:1 and / or the weight ratio of EP1:EP2 in the catalyst component is from 2:1 to 1:10, preferably from 1.5: to 1:2. According to a likewise preferred embodiment, a curable composition comprises a first polysiloxane composition (PS1) having a content of Si-H groups of 1 to 3.0 mmol / g, preferably a content of Si-H groups of 1.3 to 2.5 mmol / g, preferably a content of Si-H groups of 1.4 to 2.5 mmol / g and a second polysiloxane composition (PS2) with a content of Si-H groups of 4.1 mmol / g to KDP12329WO March 11, 2024 10 mmol / g, preferably with a content of Si-H groups of 4.1 to 8.0 mmol / g, in particular 4.1 to 5.0 mmol / g, alternatively preferably with a content of Si-H groups of 4.1 to 7.0 mmol / g, in particular 4.15 to 6.0 mmol / g. Furthermore, it is particularly preferred if in the curable composition the molar ratio of Si-H groups of the polysiloxanes to ethylene groups of the polysiloxanes is from 3.5:1 to 10:1, in particular from 6:1 to 10:1. According to an alternative, the curable composition or a mixture of base component and catalyst component preferably contains, in particular in a ratio of 5:1 to 1:5, preferably from 1:1 to 2:1 to 1:2, particularly preferably 1:1,Polysiloxanes with a content of Si-H groups or a polysiloxane composition (PS2) with a content of Si-H groups of 4.1 mmol / g to 8 mmol / g, and optionally wherein the ratio of terminal ethylene groups of the base component to terminal ethylene groups in the catalyst component is in a molar ratio of 1:1.1 to 1:10, preferably the molar ratio is from 1:1.2 to 1:10, particularly preferably from 1:1.3 to 1:10, further preferably from 1:1.4 to 1:2. According to an alternative, the curable composition or a mixture of base component and catalyst component is preferably present, in particular in a ratio of 5:1 to 1:5, preferably from 1:1 to 2:1 to 1:2, particularly preferably 1:1, a molar ratio of Si-H groups of the polysiloxanes to ethylene groups of the polysiloxanes of 1:1.8 to 1:6 with a first polysiloxane composition (PS1) having a content of Si-H groups of 1.3 to 2,5 mmol / g and a second polysiloxane composition (PS2) having a content of Si-H groups of 4.1 mmol / g to 8 mmol / g, and optionally wherein the ratio of terminal ethylene groups of the base component to terminal ethylene groups in the catalyst component is in a molar ratio of 1:1.1 to 1:10, preferably the molar ratio is from 1:1.2 to 1:10, particularly preferably from 1:1.3 to 1:10, further preferably from 1:1.4 to 1:2. Furthermore, a composition is preferred in which polysiloxanes having a Si-H group content of 1 to 3.5 mmol / g and polysiloxanes having a Si-H group content of greater than 4.1 mmol / g are present in a weight ratio of 1:1 to 1:10, in particular in a weight ratio of 1:4 to 1:6. Likewise preferred is a composition comprising the first and second polysiloxane composition as a mixture,and wherein the first polysiloxane composition (PS1) and the second polysiloxane composition (PS2) are present in a weight ratio of 1:1 to 1:10, in particular in a weight ratio of 1:4 to 1:6. According to a very particularly preferred embodiment, the first and second polysiloxane compositions are present as a mixture, wherein the first polysiloxane composition (PS1, polysiloxanes with an Si-H group content of 1 to 3.5 mmol / g) and the second polysiloxane composition (PS2, polysiloxanes with an Si-H group content of greater than 4.1 mmol / g) are present in a weight ratio of 1:1.5 to 1:2.2, in particular in a weight ratio of 1:1.5 to 1:2. According to a further preferred embodiment, the curable composition is obtainable, is prepared or is obtained by mixing two components to obtain an addition-curable composition, the two components comprisingare in particular selected from: i) base component comprising addition-crosslinking polysiloxanes containing at least two terminal ethylene groups and polydialkylsiloxanes containing at least two Si-H groups, in particular polydialkylsiloxanes containing at least two terminal ethylene groups and polydialkylsiloxanes containing at least two Si-H groups, and ii) catalyst component comprising a hydrosilylation catalyst containing platinum, rhodium and / or palladium and optionally comprising addition-crosslinking polysiloxanes containing terminal ethylene groups and optionally polysiloxanes containing Si-H groups, in particular polydialkylsiloxanes containing terminal ethylene groups, and, wherein the base component and / or the catalyst component can each independently comprise - optionally inorganic fillers, organic particulate polymers, in particular a particle size of 10 nm to 75 micrometers,and - optionally pigments comprising organic or inorganic pigments. In this case, it is preferred in each case that the base component and / or the catalyst component each independently contains at least one nonionic or ionic, at least one polyether and / or one polyether-functionalized siloxane oligomer and optionally one or mixtures of the aforementioned surfactants. According to an alternative embodiment, a curable composition comprises addition-crosslinkable organofunctional polysiloxanes comprising, in particular selected from, i. addition-crosslinking polysiloxanes containing at least two terminal ethylene groups, in particular with from 0.01 to 10 mmol / g terminal ethylene groups KDP12329WO March 11, 2024 containing polysiloxanes, preferably from 0.025 mmol / g to 5 mmol / g, particularly preferably from 0.025 mmol / g to 1 mmol / g, and ii. polysiloxanes containing at least two Si-H groups, in particular polyhydrogensiloxane,wherein the polysiloxanes containing Si-H groups comprise at least two polysiloxane compositions with different contents of Si-H groups, wherein a first polysiloxane composition (PS1) has a content of Si-H groups of 1 to 3.0 mmol / g and a second polysiloxane composition (PS2) has a content of Si-H groups of 3.9 mmol / g to 15 mmol / g, in particular the first and second and optionally further polysiloxane compositions are present as a mixture, wherein the first polysiloxane composition (PS1) has a content of Si-H groups and the second polysiloxane composition (PS2) has a content of Si-H groups in a weight ratio of 1:1.8 to 1:6, and wherein the molar ratio of Si-H groups of the polysiloxanes to ethylene groups of the polysiloxanes is from 4:1 to 10:1. Furthermore, a composition is preferredin which the polydialkylsiloxanes containing at least two terminal ethylene groups can be selected from vinyl-terminated polydialkylsiloxanes and vinyl-terminated polyether-functional polydialkylsiloxanes, and / or the polydialkylsiloxanes containing at least two Si-H groups can be selected from polydialkylsiloxanes and polyether-functional polydialkylsiloxanes, which can contain terminal Si-H groups and optionally -Si(CH3)H groups in the polysiloxane backbone. Preferred polysiloxanes include polydialkylsiloxanes with alkyl, each independently having 1 to 16 C atoms,in particular methyl groups. According to a further preferred embodiment, the vinyl-terminated polydialkylsiloxanes and vinyl-terminated polyether-functional polydialkylsiloxanes can be selected from vinyl-terminated polydimethylsiloxanes and vinyl-terminated polyether-functional polydimethylsiloxanes. The polydialkylsiloxanes containing Si-H groups can preferably be selected from polydimethylsiloxanes and polyether-functional polydimethylsiloxanes containing terminal Si-H groups and, optionally, Si(CH3)H groups in the polysiloxane backbone. Furthermore, the vinyl-terminated polysiloxanes preferably comprise vinyl-terminated polydialkylsiloxanes and vinyl-terminated polyether-functional polydialkylsiloxanes having an average molecular weight (mass average, weight average) Mw in the range from 31,000 g / mol to 124,000 g / mol.Preferably, the number average Mn is in the range from 22,000 g / mol to 89,000 g / mol. Likewise, it is preferred if the polydialkylsiloxanes containing Si-H groups are selected from polydimethylsiloxanes and polyether-functional polydimethylsiloxanes, each independently containing terminal Si-H groups and optionally containing -Si(CH3)H groups in the polysiloxane backbone, in particular with an average molecular weight (mass average, weight average) Mw in the range from 500 g / mol to 19,000 g / mol, and preferably the number average Mn is in the range from 500 g / mol to 14,000 g / mol. Preferably, the polydialkylsiloxanes containing at least two terminal ethylene groups are selected from vinyl-terminated polydialkylsiloxanes and vinyl-terminated polyether-functional polydialkylsiloxanes having a viscosity of 100 to 100,000 mPa, .s. The polydialkylsiloxanes containing at least two Si-H groups are preferably selected from polydialkylsiloxanes and polyether-functional polydialkylsiloxanes containing terminal Si-H groups and optionally in the polysiloxane backbone -Si(CH3)H groups and with a content of Si-H and optionally in the polysiloxane backbone -Si(CH3)H groups of 4 to 8 mmol / g, in particular from 4.05 mmol / g to 8 mmol / g. It may further be preferred that the polydialkylsiloxanes containing Si-H groups are selected from polydialkylsiloxanes and polyether-functional polydialkylsiloxanes, each independently with terminal Si-H groups and optionally in the polysiloxane backbone with -Si(CH3)H groups, which have a viscosity of 10 to 500 mPa .s. The viscosity is determined as described above. The polydialkylsiloxanes containing terminal ethylene groups can preferably be selected from vinyl-terminated polydialkylsiloxanes and vinyl-terminated polyether-functional polydialkylsiloxanes, with a vinyl group content in the range from 0.02 mmol / g to 2.0 mmol / g, preferably from 0.02 to 1.0 mmol / g. According to an alternative embodiment, a composition is preferred which is obtainable or obtained by mixing an i) base component and ii) catalyst component, wherein i) the base component comprises 30 to 50 wt.%, in particular 35 to 45 wt.%, of polydialkylsiloxanes containing at least two terminal ethylene groups, 15 to 64 wt.%, in particular 30 to 50 wt.%, of inorganic fillers, KDP12329WO 11 March 2024 5 to 30 wt.%, in particular 7 to 25 wt.%, of polydialkylsiloxanes containing at least two Si-H groups, 1.0 to 15 wt.%, in particular 1 to 10 wt.%,at least one surfactant, in particular at least one polyether and / or at least one polyether-functionalized siloxane oligomer, in particular the polyether-functionalized siloxane oligomer has at least one alkylsiloxane group, or mixtures of these surfactants, and wherein the total sum of the base component is 100 wt.%, and ii) the catalyst component comprises 20 to 80 wt.%, in particular 35 to 65 wt.%, of polydialkylsiloxanes containing at least two terminal ethylene groups, 5 to 70 wt.%, in particular 35 to 65 wt.%, of inorganic fillers, 0.001 to 5.0 wt.% of a hydrosilylation catalyst containing platinum, rhodium or palladium, 0 to 15 wt.% of at least one surfactant, in particular 1.0 to 15 wt.% of at least one surfactant, in particular at least one polyether and / or at least one polyether-functionalized siloxane oligomer, in particular, the polyether-functionalized siloxane oligomer has at least one alkylsiloxane group,or mixtures of these surfactants, and 0 to 10 wt.% organic or inorganic pigments and / or structuring agents, wherein the total of the catalyst components is 100 wt.%. According to a preferred alternative, the base components and the catalyst component are mixed in a weight ratio of 10:1 to 1:10, in particular in a ratio of 5:1 to 1:5, preferably 2:1 to 1:2. Furthermore, it is preferred if the composition is obtainable or is obtained by mixing an i) base component and ii) catalyst component, wherein i) the base component comprises 30 to 50 wt.% of polydialkylsiloxanes containing at least two terminal ethylene groups, and ii) the catalyst component comprises 20 to 80 wt.% of polydialkylsiloxanes containing at least two terminal ethylene groups,and wherein the ratio of terminal ethylene groups of the base component to terminal ethylene groups of the catalyst component is in a molar ratio of 1:1.1 to 1:10, preferably the molar KDP12329WO March 11, 2024 ratio is from 1:1.2 to 1:10, particularly preferably from 1:1.3 to 1:10, further preferably from 1:1.4 to 1:2. According to a further alternative, the invention relates to a kit comprising a 2K dispensing device comprising at least two cartridges, wherein the i) base component is present in one cartridge and the ii) catalyst components are present in the second cartridge. The kit can further comprise at least one removable and attachable static mixer. Compounds of formula I include: H2C=CH-CH2Si(CH3)3CAS: [762-72-1], H2C=CH-(CH2)2Si(CH3)3, H2C=CH-(CH2)3Si(CH3)3, H2C=CH-(CH2)4Si(CH3)3, H2C=CH-(CH2)8Si(CH3)3, H2C=CH-CH2Si(i-C3H7)3 CAS: [24400-84-8], H2C=CH-(CH2)2Si(i-C3H7)3, H2C=CH-(CH2)3Si(i-C3H7)3,H2C=CH-(CH2)4Si(i-C3H7)3, H2C=CH-(CH2)2Si(CH3)2(t-C4H9), H2C=CH-(CH2)3Si(CH3)2(t-C4H9), H2C=CH-(CH2)4Si(CH3)2(t-C4H9), H2C=CH-(CH2)8Si(CH3)2(t-C4H9), H2C=CH-CH2Si(C2H5)3, H2C=CH-(CH2)2Si(C2H5)3, H2C=CH-(CH2)3Si(C2H5)3, H2C=CH-(CH2)4Si(C2H5)3, H2C=CH-(CH2)8Si(C2H5)3, H2C=CH-CH2Si(CH3)2(n-C18H37), H2C=CH- (CH2)2Si(CH3)2(n-C18H37), H2C=CH-(CH2)3Si(CH3)2(n-C18H37), H2C=CH-(CH2)4Si(CH3)2(n- C18H37), H2C=CH-(CH2)8Si(CH3)2(n-C18H37), H2C=CH-CH2Si(CH3)2(C6H5), H2C=CH-(CH2)2Si(CH3)2(C6H5), H2C=CH-(CH2)3- Si(CH3)2(C6H5), H2C=CH-(CH2)4Si(CH3)2(C6H5), H2C=CH-(CH2)8Si(CH3)2(C6H5), H2C=CH-CH2-O-Si(CH3)3, H2C=CH-CH2-O-Si(C2H5)3, H2C=CH-CH2-O-Si(i-C3H7)3, H2C=CH-CH2-O-Si(CH3)2(t-C4H9), H2C=CH-CH2-O-Si(CH3)2(n-C18H37), H2C=CH-CH2-O-Si(CH3)2(C6H5), H2C=CH-CH2Si(CH3)2-O-Si(CH3)3, H2C=CH-(CH2)2Si(CH3)2-O-Si(CH3)3, H2C=CH-(CH2)3Si(CH3)2-O-Si(CH3)3H2C=CH-(CH2)4Si(CH3)2-O-Si(CH3)3, H2C=CH-(CH2)8Si(CH3)2-O-Si(CH3)3, H2C=CH-CH2Si(CH3)(-O-Si(CH3)3)2, H2C=CH-(CH2)2Si(CH3)(-O-Si(CH3)3)2,H2C=CH-(CH2)3Si(CH3)(-O-Si(CH3)3)2, H2C=CH- (CH2)4Si(CH3)(-O-Si(CH3)3)2, H2C=CH-(CH2)8Si(CH3)(-O-Si(CH3)3)2, H2C=CH-CH2Si(-O- Si(CH3)3)3, H2C=CH-(CH2)2Si(OCH3)3)3, H2C=CH-(CH2)2Si(OCH3)3)3, H2C=CH-(CH2)3Si(OCH3)3, H2C=CH-(CH2)4Si(OCH3)3, H2C=CH- (CH2)8Si(OCH3)3, H2C=CH-CH2Si(OC2H5)3, H2C=CH-(CH2)2Si(OC2H5)3, H2C=CH-(CH2)3Si(OC2H5)3, H2C=CH-(CH2)4Si(OC2H5)3, H2C=CH-(CH2)8Si(OC2H5)3, H2C=CH-CH2Si(C6H5)3CAS: [18752-21- 1], H2C=CH-(CH2)2Si(C6H5)3, H2C=CH-(CH2)3Si(C6H5)3, H2C=CH-(CH2)4Si(C6H5)3, H2C=CH-(CH2)8Si(C6H5)3, H2C=C(CH3)- KDP12329WO 11. März 2024 CH2Si(CH3)3CAS: [18292-38- 1], H2C=CH-CH2Si(p-C6H, 40CH3) CAS: [68469-60-3], H2C=CH- CH2Si(CH3)2H, H2C=CH-(CH2)2Si(CH3)2H, H2C=CH-(CH2)3Si(CH3)2H, H2C=CH-(CH2)4Si(CH3)2H, H2C=CH-(CH2)8Si(CH3)2H, and Mixtures of these. Preferably, the at least one further surfactant is selected from polyether and polyether-functionalized siloxane oligomers, wherein the siloxane oligomer contains at least one alkylsiloxane group, in particular the polyethers and / or the polyether groups of the polyether-functionalized siloxane oligomers are selected from polyalkylene oxide groups, in particular the polyalkylene oxide groups are selected from polyethylene oxide groups comprising methoxy-polyethylene oxide-alkylene groups, ethoxy-polyethylene oxide-alkylene groups, methoxy-ethylene oxide-alkylene groups, polyethylene oxide-alkylene groups.More preferably, the at least one further surfactant comprises or is selected from polyethers and polyether-functionalized siloxane oligomers, wherein the siloxane oligomer contains at least one alkyltrisiloxane group. A polyalkylene oxide-functionalized heptamethyltrisiloxane is preferred, a polyethylene oxide-alkylene-functionalized heptamethyltrisiloxane is further preferred, and 3-(2-methoxyethoxy)propylmethylbis(trimethylsilyoxy)silane is particularly preferred. The surfactant is particularly preferably selected from polyethers and polyether-functionalized siloxane oligomers, wherein the siloxane oligomer contains at least one alkylsiloxane group. In particular, the polyethers and / or the polyether groups of the polyether-functionalized siloxane oligomers are selected from polyalkylene oxides.The polyalkylene oxide groups of the polyether-functionalized siloxane oligomers are preferably selected from polyethylene oxide groups, methoxypolyethylene oxide alkylene groups, ethoxypolyethylene oxide alkylene groups, methoxyethoxyalkylene groups, and polyethylene oxide alkylene groups. A polyalkylene oxide-functionalized alkyltrisiloxane is preferred, preferably a polyalkylene oxide-functionalized heptamethyltrisiloxane, and a polyalkylene oxide-alkylene-functionalized heptamethyltrisiloxane is particularly preferred. The viscosity of the additional surfactant is preferably between 15 and 24.1 mPas. Preferred additional surfactants include: 3-(2-methoxyethoxy)propylmethylbis(trimethylsilyoxy)silane. Polyethers include α- and / or β-polyethers of alkenyl polyethers, alkynyl polyethers, hydroxy polyethers, aryloxy-, arylalkyloxy-, and / or alkoxy-terminated polyethers. Preferred polyethers include α-alkenylene-α-alkyl polyethers with C1 to C8 alkenylene and KDP12329WO 11.March 2024 C1 to C4 alkyl, preferably allyl polyethylene glycol methyl ether (CAS 27252-80-8) and / or ^, ^-alkyl polyethers with C1 to C4 alkyl. The further surfactant can preferably be present as a mixture of polyethers and polyether-functionalized siloxane oligomers. Polyethers according to the present invention can be present as surfactant comprising C2 to C4 alkylene oxides or as polyether-functional polydialkylsiloxanes containing terminal ethylene groups. The polyether-functional polydialkylsiloxanes containing terminal ethylene groups are preferably selected from vinyl-terminated polyether-functional polydialkylsiloxanes comprising C2 to C4 alkylene oxides. Suitable polyols for the preparation of the polyethers are, for example, the reaction products of ethylene glycol, propylene glycol, butanediol or hexanediol isomers with one or more of the following alkylene oxides: ethylene oxide, propylene oxide or butylene oxides, such as tetrahydrofuran.Furthermore, polyethers can also be reaction products of polyfunctional alcohols such as glycerol, trimethylolethane or trimethylolpropane, pentaerythritol or sugar alcohols, or mixtures of two or more thereof with the aforementioned alkylene oxides, which are suitable for forming the polyether polyols. Suitable platinum-, rhodium-, or palladium-containing hydrosilylation catalysts are understood to be platinum-, rhodium-, or palladium-containing catalysts or their precatalysts, which can be dissolved in the siloxanes and preferably in the components. Thus, preference is given to catalysts that do not form a disperse phase in the other compounds present in the components. Platinum complexes comprising ethylenic siloxane compounds, preferably divinyl disiloxanes, are preferred.Typical precatalysts are hexachloroplatinic acid dissolved in isopropanol (Speier catalyst) and Karstedt catalysts (H2PtCl6 and divinyldisiloxanes such as (CH2=CH)Me2Si-O-SiMe2(CH=CH2)). Karstedt catalysts can contain dinuclear platinum(0) complexes. Equally preferred hydrosilylation catalysts include [1,3-bis(cyclohexyl)imidazol-2-ylidene][1,3-divinyl-1,1,3,3-tetramethyldisiloxane]platinum(0)(ICy)Pt(vs); [1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene][1,3-divinyl-1,1,3,3-tetramethyldisiloxane]platinum(0), (IPr)Pt(vs). Alternatively, the polydimethylsiloxanes can be substituted by 1 to 10 mol% of the methyl groups in the siloxane backbone with C2 to C16 alkyl groups, especially C2 to C8, and / or phenyl groups. Alternatively, allyl-terminated polydialkylsiloxanes or allyl-terminated polyether-functional polydialkylsiloxanes can also be used. KDP12329WO 11.March 2024 Furthermore, compositions are preferred in which the vinyl-terminated polydialkylsiloxanes and vinyl-terminated polyether-functional polydialkylsiloxanes have an average molecular weight (mass average, weight average) Mw in the range from 31,000 g / mol to 124,000 g / mol, preferably the number average Mn is in the range from 22,000 g / mol to 89,000 g / mol, and / or the Si-H group-containing polydialkylsiloxanes are preferably selected from polydimethylsiloxanes and polyether-functional polydimethylsiloxanes with terminal Si-H groups and optionally with groups containing -Si(CH3)H- in the polysiloxane backbone, in particular with an average molecular weight (mass average, weight average) Mw in the range from 500 g / mol to 19,000 g / mol, and preferably the number average Mn is in the range from 500 g / mol to 14000 g / mol. The determination of Mw and Mn can be performed using gel permeation chromatography (SDB copolymer with toluene eluent).Likewise preferred are compositions comprising terminal ethylene group-containing polydialkylsiloxanes selected from vinyl-terminated polydialkylsiloxanes and vinyl-terminated polyether-functional polydialkylsiloxanes having a viscosity of 100 to 100,000 mPa. . s, and / or in which the polydialkylsiloxanes containing Si-H groups are selected from polydialkylsiloxanes and polyether-functional polydialkylsiloxanes containing terminal Si-H groups and optionally in the polysiloxane backbone –Si(CH3)H groups and having a viscosity of 10 to 500 mPa . s, especially from 20 to 50 mPa . s (DIN 53015 Höppler Kugel 3) and optionally from 200 to 340 mPa .s (DIN 53015 Höppler ball 4). Viscosity is generally determined using the (DIN 53015 Höppler ball 4). For polydialkylsiloxanes containing ethylene groups, the viscosity can be determined using the rotational viscosity cone (4° / 40 mm) / plate BU-Q 30.027) U0.2 / U1: DIN 53015 Höppler ball 5. Likewise, curable composition, base and / or catalyst component comprising polydialkylsiloxanes containing Si-H groups of a first polysiloxane composition are preferred, which comprise the terminal Si-H groups and optionally in the polysiloxane backbone containing -Si(CH3)H groups, wherein the content of Si-H and optionally in the polysiloxane backbone of -Si(CH3)H groups is from 1 to 3.5 mmol / g, preferably the content is from 1 to 2 mmol / g.Also preferred are compositions, base and / or catalyst components comprising polydialkylsiloxanes containing Si-H groups of a second polysiloxane composition, which comprise terminal Si-H groups and -Si(CH3)H groups optionally contained in the polysiloxane backbone, wherein the content of Si-H and optionally in the polysiloxane backbone of -Si(CH3)H groups is from 3.8 to 15 KDP12329WO March 11, 2024 mmol / g, preferably the content is from 4 to 8, in particular 4.05 to 8 mmol / g mmol / g. Preferred curable compositions comprise an i) base component and an ii) catalyst component or are optionally obtainable by mixing an i) base component and ii) catalyst component, wherein i) comprises 30 to 50 wt.%, in particular 20 to 39 wt.%, of polydialkylsiloxanes containing terminal ethylene groups, 15 to 64 wt.%, in particular 36 to 63 wt.%, of inorganic fillers, 5 to 30 wt.%, in particular 5 to 21 wt.-%, polydialkylsiloxanes containing Si-H groups, 1.0 to 15 wt.%, in particular 1 to 10 wt.%, of at least one surfactant and optionally at least one further surfactant comprising at least one polyether and / or at least one polyether-functionalized siloxane oligomer, particularly preferably from 4 to 8 wt.% of at least one polyether and / or at least one polyether-functionalized siloxane oligomer, in particular the polyether-functionalized siloxane oligomer has at least one alkylsiloxane group, or mixtures of these surfactants, preferably the further surfactant is at least one polyether-functionalized siloxane oligomer, and 0 to 10 wt.%, in particular 0.001 to 0.5 wt.%, palladium-containing composition, and 0 to 10 wt.% organic or inorganic pigments and / or structuring agents, wherein the total sum of the components in the base component is 100 wt.%, and ii) comprises 20 to 80 wt.%, in particular 30 to 80 wt.-%, polydialkylsiloxanes containing terminal ethylene groups, particularly preferably 36 to 61 wt.%, 5 to 70 wt.%, in particular 36 to 61 wt.%, inorganic fillers, 0.001 to 5.0 wt.%, in particular 0.2 to 1.0 wt.%, of a hydrosilylation catalyst containing platinum, rhodium or palladium, in particular a hydrosilylation catalyst containing platinum, preferably a Karstedt catalyst, 1.0 to 15 wt.%, in particular 1 to 10 wt.%, of at least one surfactant and optionally at least one further surfactant comprising at least one polyether and / or at least one polyether-functionalized siloxane oligomer, in particular the polyether-functionalized siloxane oligomer has at least one alkylsiloxane group, or mixtures of these surfactants, preferably the further surfactant is at least one polyether- KDP12329WO March 11, 2024 functionalized siloxane oligomer, 0 to 10 wt.-% organic or inorganic pigments and / or structuring agents, wherein the total sum of the components in the catalyst component is 100 wt.%, wherein the total content of the at least one surfactant and optionally of the at least one further surfactant comprising at least one polyether and / or at least one polyether-functionalized siloxane oligomer or a mixture of the aforementioned surfactants in the composition is from 2.0 to 20 wt.%. Rheological aids such as Aerosils or the like can be used as structuring agents, for example. Palladium-containing compositions can be added to the curable compositions as hydrogen scavengers. Silicon dioxide, fumed silica, precipitated silica, quartz, kaolin can be used as inorganic fillers, organic particulate polymers, wherein the inorganic fillers are preferably hydrophobicized. Other surfactants that can be used include:Fatty alcohols, such as ethoxylated fatty alcohols, especially C11 to C14 alcohols, are suitable. According to a preferred embodiment, the base component and the catalyst component can be mixed in a weight ratio of about 1:1 to 10:1, preferably about 1:1 or about 5:1 or about 4:1 or about 10:1. Particularly preferably, in a weight ratio of 2:1 to 1:2, further preferably 1:1 with a deviation of + / - 15 wt.%.The invention also relates to the use of the composition for making impressions in the medical, dental and / or veterinary field, for making impressions in the field of botany, for making impressions in the marine and aquatic field, for making impressions of surfaces of articles, for making impressions of design, art or craft objects, as a dental impression material, as an impression material for human, veterinary or marine soft (tissue) and / or hard structures (bones, shells, coral), such as ear impressions, podiatry, forensic science, for making impressions of electronic components, for making impressions of objects whose surfaces are wetted with aqueous compositions or whose surfaces are wetted with water and / or for printing three-dimensional structures, in particular in the semiconductor field.The compositions according to the invention are suitable as impression material in which a high level of detail must be achieved. Impression material, in particular dental impression material, includes precision impression materials, situation impression materials, KDP12329WO March 11, 2024 bite registration materials, duplication materials (usable for duplicating master models such as all-ceramic restorations, inlays, onlays, cantilevers), as well as modeling materials such as those used for gum reconstruction. The following are exemplary embodiments intended to explain the invention without limiting it to the specific examples. Examples: The figures show: Fig. 1: Complex viscosity (^*(t5), ^*(t90) over 10 minutes), HAAKE RheoStress 1, rotational rheometer, oscillation mode, 30 °C of the modified reference example with PS2 Fig. 2: Comparison of relative Shore hardness A with 6.2 to 16 wt.-% PS2 (4.17 mmol / g) shows the influence of a high SiH / vinyl ratio (molar ratio of SiH groups of the polysiloxanes to ethylene groups of the polysiloxanes at a constant content of the compound of formula I, here ATMS Fig. 3: Variation of the allylsilane content (ATMS) with non-inventive compositions (US7700712B2, Ex. D), with ATMS contents (1.5 wt.% ATMS, 0.4 wt.%, 0.0 wt.% ATMS), where ATMS content was replaced by crystalline SiO2, ^T 6.3 °C to 4.5 °C The base pastes (base component) and catalyst paste (catalyst component) were each homogenized separately in a planetary mixer. For the subsequent experiments, 60 g batches comprising the respective paste were prepared in a Hauschild beaker. The base paste and catalyst paste thus prepared were then filled into cartridges filled. Using static mixers, the base paste and the catalyst paste were mixed in the following examples in a weight ratio of 1:1.Viscosity measurements According to Figure 1, the complex viscosity was measured on a HAAKE™ RheoStress™ 1 rotational rheometer, oscillation mode, at 30 °C and displayed as |η*| Pas] vs t [min]., continuously increasing the shear rate to 8 Hz, with subsequent reduction of the shear rate the viscosity is measured at 3 Hz. The complex viscosity after 10 min corresponds to the maximum value, t90 corresponds to the time at 90% of this value and t5 to the time at 5% of the maximum value. KDP12329WO March 11, 2024 Procedure: The complex viscosity is measured during curing using a rheometer at 30 °C. Measurement conditions for the viscosity measurement Device RheoStress 1 Manufacturer Thermo Scientific Measuring device Plate / plate, profiled Measuring geometry P20 Ti LS Measuring plate attachment MPC20 S Type Rotating body PP20PRO.Measuring temperature 30°C Measuring frequency 1.0 Hz Shear stress 800 Pa Gap height 0.5 mm Gap volume 0.2 ml Rotation mode CS Measuring type oscillation No change in the viscosity curve visible = termination or max. measuring time 10 min The sample quantity in each case was: m = (1.0 ± 0.1) g The Shore hardness A (DIN 53505:2000-08) is measured every 30 seconds at (23±2) °C as soon as the test specimen of the mixture of base and catalyst paste no longer sticks, i.e. a first measurement is carried out as soon as the film can be removed from the material. The last measuring point is 10 minutes after mixing the aforementioned pastes. The final viscosity is read after 10 minutes and the values ​​t5 (time at 5% of the final viscosity) and t90 (time at 90% of the final viscosity) are calculated from this. The times are obtained by extrapolating the curves at the corresponding viscosity value. A relative Shore A hardness is calculated by normalizing to the Shore A hardness value at t = 10 min.Subsequently, a time t. SH calculated from the difference between the first possible measurement and the time after which 90% of the Shore hardness is reached within 10 minutes. The shorter t SH is, the faster the material hardens. The difference between t 90 -t5 in minutes (industrial time) indicates the transition time (defined time window for setting reaction or hardening) from the plastic to the elastic state. The shorter t 90 -t5is the faster the composition cures within this time window. KDP12329WO 11 March 2024 Table 1: Shore hardness A, t SH (min.), t = (t90-t5) (min.), ^T (°C) Example 1 Example 2 Comparative example Comparative example Example D (WO2013 / 025494A1) US7700712B2 Example 1 B / A Shore Hardness A t SH (min) 00:00 00:00 4:30 0:00 t 5 (min) 1.46 1.49 1.9 1.83 t = (t 90 -t 5) (min) 0.61 0.61 2.5 0.94 ^T (°C) 7.4 7.3 5.7 11.7 Temperature measurement Description of the method: 1. A tube (21 mm diameter laminate tube = plastic-coated aluminum tube) is shortened to a length of about 5 cm. 2. The tube is filled with material by discharging it from the cartridge using a static mixer (1:1 systems, 5:1 with a dynamic mixer) so that the tube is filled with about 8 g of material. The time is started when the material is first discharged from the cartridge. The quantities were weighed after the test. 3. The temperature sensor of the measuring device (type: Testo 925) is placed in the mass. The first measurement is recorded after 15 seconds. 4. From 30 seconds onwards, the temperature is recorded every 30 seconds up to 10 minutes. At this point, all samples had already passed the maximum temperature, and the temperature steadily decreased. 5. The sample is removed from the thermometer and weighed (m = 8 g + / - 0.5 g).Mixture of polydimethylsiloxane (PDMS oil) Comparative Example A Polydimethylsiloxane with terminal vinyl groups (vinyl content: 0.26 mmol / g) Polydimethylsiloxane with terminal vinyl groups (vinyl content: 0.13 mmol / g) Polydimethylsiloxane with terminal vinyl groups (vinyl content: 0.05 mmol / g) KDP12329WO March 11, 2024 Inventive examples and modified reference example: The vinyl content in the base pastes of the following examples is: Content of C=C groups: from 0.05 to 0.09 mmol / g (Ex. 1 = 0.09 mmol / g, Ex. 2 and 3 = 0.07 mmol / g and Ex. 4: 0.05 mmol / g Mixture of polydimethylsiloxane (PDMS oil): The vinyl content in the catalyst pastes of the following examples is: Content of C=C groups: 0.088 mmol / g Comparative examples and modified reference example: In example D of US 7700712 B2 and in the examples of WO2013 / 025494, example 1, B / A, no information is given on the vinyl content orC=C content was disclosed, therefore the vinyl content was adjusted analogously to the above base and catalyst pastes. Crosslinker: Poly(methyl)(hydrogen)siloxane Crystalline SiO2: Cristobalite Palladium dispersion (Pd dispersion): Palladium chloride dispersion in divinylpolydimethylsiloxane Catalyst: Platinum Tetramethyldivinyldisiloxane complex, Karstedt catalyst preparation (4 wt. % Pt) The mixing ratio of base paste and catalyst paste is 1:1 unless otherwise stated. The following inventive and other examples were all carried out with the same mixture of PDMS oil (polydimehtlysiloxane). Therefore, the examples given as reference examples are not comparative examples according to the prior art, but internal reference examples.

[0002] Table 2: Comparative examples and modified reference example Comparative example Comparative example 1 Comparative example A WO 2013 / 025494 Modified reference example with example D Example A Example 1 (B / A) PS2 US 7700712B2 US 7700712B2 1 : 1 5 : 1 3% allyltrimethylsilane in base 3% allyltrimethylsilane in catalyst Base catalyst Base catalyst Base catalyst Base catalyst [wt.%] [wt.%] [wt.%] [wt.%] [wt.%] [wt.%] [wt.%] Mixture PDMS Oil Content C=C not specified in WO 2013 / 025494* 40.7 49.1 40 49.1 43.8 40.7 27.1 30 Crosslinker PS1 (1.8 mmol / g SiH) 5.7 — 6.4 — 6.0 — 7.5 — Crosslinker PS** (4.0 mmol / g SiH) 11.6 — — — 7.0 — — — Crosslinker PS2 (4.17 mmol / g SiH) — — 11.6 — — — — — n(Vinyl) [mmol / wt%] 7.1 7.0 11.0 5.5 n(SiH) [mmol / wt%] 56.7 59.9 38.8 13.5 13.5 — Fumed silica 2.6 3.5 2.6 3.5 4.0 2.6 6.4 5 Crystalline SiO2 33.3 45.4 36.3 42.4 29.5 49.9 56.1 63.9 Silicopolyether surfactant 3.1 — 3.1 — 1.5 — 0.4 — Allyltrimethylsilane 3 — — 3 — 0.8 1.5 — n(Allyl) [mmol / wt%] 26.3 — — 26.3 — 7.0 13.1 — Silicone oil (10 mPas) — — — — 7.8 3.8 — — Pigment — 0.6 — 0.6 0.5 0.1 1.0 — Tetraallylsilane — 0.5 — 0.5 — 0.5 — — Pt catalyst — 0.4 — 0.4 — 1.6 — 1.0 Pd dispersion — 0.5 — 0.5 — — — 0.1 SiH / Vinyl: molar ratio 8.0 8.6 3.5 2.03 X / Y: molar ratio of SiH groups to C=C group of the compound of the formula I 2.16 2.28 5.54 1.03 t. 5 / min 1.83 0.96 1.9 1.73 (t 90 - t 5 ) / min 0.94 0.72 2.5 1.03 ΔT / °C 11.7 10.1 5.7 8.9 t SH0:00 0:00 4:30 01:00 PS1:PS2 Weight ratio **or for the non-inventive 1 : 2.04 1 : 1.81 1 : 1.16 — PS1:PS * It was reworked with our own silicone oil content vinyl groups as a comparison example.

[0003] Table 3: Examples 1 to 4 (base paste (base), catalyst paste (catalyst) Example 1 Example 2 Example 3 Example 4 Base Catalyst Base Catalyst Base Catalyst Base Catalyst [wt.%] [wt.%] [wt.%] [wt.%] [wt.%] [wt.%] [wt.%] Mixture PDMS Oil Content C=C not specified in WO 2013 / 025494* 39 49.1 42 49.1 40.4 49.1 27.6 49.1 Crosslinker PS1 (1.8 mmol / g SiH) — — 2.5 — 5.8 — 12.5 — Crosslinker PS2 (4.17 mmol / g SiH) 16 — 13.5 — 11.8 — 6.2 — n(Vinyl) [mmol / wt%] 7.9 7.2 7.0 5.7 n(SiH) [mmol / wt%] 66.7 60.8 59.6 48.4 Fumed silica 2.6 3.5 2.6 3.5 2.6 3.5 2.6 3.5 Crystalline SiO2 38.5 45.4 35.5 45.4 35.5 45.4 40.0 45.4 Silicopolyether surfactant 3.1 — 3.1 — 3.1 — 3.1 — Allyltrimethylsilane 0.8 — 0.8 — 0.8 — 0.8 — n(Allyl) [mmol / wt-%] 7.0 7.0 7.0 7.0 Pigment — 0.6 — 0.6 — 0.6 — 0.6 Tetraallylsilane — 0.5 — 0.5 — 0.5 — 0.5 Pt catalyst — 0.4 — 0.4 — 0.4 — 0.4 Pd dispersion — 0.5 — 0.5 — 0.5 — 0.5 SiH / vinyl: molar ratio 8.5 8.5 8.5 8.5 X / Y: molar ratio of SiH groups to C=C group of the compound of the formula I 9.53 8.68 8.52 6.91 t. 5 / min 1.46 1.49 1.36 1.76 (t 90 - t 5 ) / min 0.61 0.61 0.61 0.83 ΔT / °C 7.4 7.3 6.8 6.1 t SH 00:00 00:00 00:50 00:50 PS1:PS2 weight ratio 0 : 16 1 : 5.4 1 : 2.03 1 : 0.5

[0004] KDP12329WO 11 March 2024 With increasing crosslinker activity (Example 1: 16 wt% with 4.17 mmol / g Si-H vs 6.2% 4.17 mmol / g Si-H / 12.5% ​​1.8 mmol / g Si-H) a reduction of the time difference t 90– t5(0.61 min. (Example 1) vs 0.83 min. (Example 4)) and a stronger increase in Shore A hardness (see Figure 2, 0.6 (1 / min) to 1.8 (1 / min.) of the examples according to the invention compared to 0.18 (1 / min) of Comparative Example 1) were observed. Compared to the prior art WO 2013 / 025494 A1 (content of monofunctional allylsilane based on the total composition), with the modification that the content of ethylene groups was selected analogously to the compositions according to the invention, a temperature increase of already about 7 °C can be achieved with a comparatively small amount of monofunctional allylsilane (0.4 wt. % based on the total composition) and a ratio of Si-H groups (X) to allyl groups (Y) of the compound of the formula I of X / Y > 5. Alternatively or additionally, the time difference t90 - t5 of 0.94 (composition with 1.5 wt.-% allyltrimethylsilane based on the total composition and a molar ratio of greater than or equal to 9.1 X / Y (SiH:C=C of formula I). ​​Figure 3 shows that at a low molar ratio of X / Y (SiH / C=C of formula I) according to Comparative Example 1 (Example D, US 7700712 B2), the allyltrimethylsilane has no influence on the increase in Shore A hardness, i.e., the setting reaction. The addition of allyltrimethylsilane leads only to a slight temperature increase from 4.5 °C to 6.4 °C.

Claims

KDP12329WO March 11, 2024 Patent claims 1. Curable composition comprising addition-crosslinkable organofunctional polysiloxanes comprising i. addition-crosslinking polysiloxanes containing at least two terminal ethylene groups and ii. polysiloxanes containing at least two Si-H groups, wherein the polysiloxanes containing Si-H groups have a content of polysiloxanes with a content of Si-H groups of 4.1 mmol / g to 15 mmol / g, and optionally comprising a hydrosilylation catalyst, characterized in that it has 3 to 25 wt. % of polysiloxanes containing Si-H groups with a content of Si-H groups of 4.1 to 15 mmol / g, based on the total composition of 100 wt. % of the curable composition.

2. Composition according to claim 1, characterized in that the curable composition comprises a monounsaturated compound of formula I R 2 R 3 C=CR 1-A-SiR3 (I) with R each independently selected from H, monovalent alkyl group with 1 to 22 C atoms, aryl group with 16 to 12 C atoms, O-SiR 4 3-group, wherein R optionally comprises heteroatoms, with the proviso that R is not an alkoxy group or arylalkoxy group, R 1 , R 2 , R 3 are each independently selected from H, monovalent alkyl group having 1 to 22 C atoms, aryl group having 6 to 12 C atoms and optionally each independently comprise heteroatoms, R 4 a monovalent alkyl group having 1 to 22 C atoms or aryl group having 6 to 12 C atoms, optionally two or three R 4 Residues in O-SiR 43 form a cyclic or polycyclic structure, A is a bivalent linear, branched or cyclic hydrocarbon group having 1 to 12 C atoms, optionally comprising an aromatic having at least one methylene group which is directly covalently bonded to the aromatic, optionally comprising -O atoms, preferably A is methylene, ethylene, propylene, butylene, hexylene, octylene, nonylene or decylene, wherein the molar ratio of Si-H groups of the polysiloxanes containing Si-H groups to the monounsaturated compound of the formula I is greater than 6. KDP12329WO March 11, 2024 3. Composition according to claim 1, characterized in that the molar ratio of Si-H groups of the polysiloxanes, of the polysiloxanes containing at least two Si-H groups and having a content of Si-H groups of 4.1 mmol / g to 15 mmol / g, to ethylene groups of the polysiloxanes is from 4:1 to 10:

1.

4. Composition according to one of claims 1 to 3, characterized in that the curable composition contains no monounsaturated compound of the formula I or the content of the monounsaturated compound of the formula I in the curable composition is from 0.001 to 0.5 wt. %, in particular 0.1 to 0.5 wt. %, the total content of the composition being 100 wt.

5. Composition according to one of claims 1 to 3, characterized in that ii.Polysiloxanes containing at least two Si-H groups comprise at least two polysiloxane compositions with different Si-H group contents, wherein a first polysiloxane composition (PS1) has an Si-H group content of 1 to 3.5 mmol / g and a second polysiloxane composition (PS2) has an Si-H group content of 4.1 mmol / g to 15 mmol / g, wherein the first polysiloxane composition (PS1) has an Si-H group content and the second polysiloxane composition (PS2) has an Si-H group content in a weight ratio of 1:1.5 to 1:10, and wherein the molar ratio of Si-H groups of the polysiloxanes to ethylene groups of the polysiloxanes is from 4:1 to 10:1, and optionally comprising a hydrosilylation catalyst. 6.Composition according to one of claims 1 to 5, characterized in that the Si-H group-containing polysiloxanes with a Si-H group content of 4.1 to 15 mmol / g (second polysiloxane composition PS2) are present in a weight ratio of greater than 2, in particular greater than or equal to 5, with respect to the Si-H group-containing polysiloxanes with a Si-H group content of less than 4.0 mmol / g Si-H groups, in particular with respect to polysiloxanes with a Si-H group content of 1 to 3.55 mmol / g (first polysiloxane composition PS1).

7. Composition according to one of claims 2 to 6, characterized in that the molar ratio of Si-H groups of the polydisiloxanes to ethylene groups of the compound of formula I is greater than 5, in particular the molar ratio is. KDP12329WO March 11, 2024 of Si-H groups of the polydisiloxanes to the ethylene groups of the compound of the formula I is greater than 5.5, preferably greater than 6, particularly preferably greater than 6.5, further preferably greater than 7.

8. Composition according to one of claims 2 to 7, characterized in that the molar ratio of Si-H groups of the polydisiloxanes with greater than or equal to 4.1 mmol / g Si-H groups to ethylene groups of the compound of the formula I is greater than 5, in particular the molar ratio of Si-H groups of the polydisiloxanes to the ethylene groups of the compound of the formula I is greater than 5.5, preferably greater than 6, particularly preferably greater than 6.5, further preferably greater than 7. 9.Composition according to one of claims 1 to 8, characterized in that the addition-crosslinking polysiloxanes containing at least two terminal ethylene groups comprise polydialkylsiloxanes, polydialkylsiloxane ethers, or mixtures thereof, in particular with alkyl, each independently having 1 to 16 C atoms, in particular methyl groups.

10. Composition according to one of claims 2 or 9, characterized in that the curable composition comprises a content of 0.1 to 0.5 wt. % of at least one monounsaturated compound of formula I, the total content of the composition being 100 wt. %. 11.Composition according to one of claims 1 to 10, characterized in that (i) the maximum temperature increase ( ^T) during curing is less than or equal to 7 °C, wherein the temperature increase is measured with a temperature sensor in the mass in the time interval 15 seconds from the first mixing to 10 minutes after the first mixing, in particular wherein a temperature measurement is carried out every 30 seconds, and / or (ii) the value t5 in minutes from the first mixing corresponds to the complex viscosity (DIN53505) of 5% and t90 in minutes corresponds to the complex viscosity of 90% of the complex viscosity 10 minutes after the start of mixing, wherein t90 is less than or equal to 1.7 minutes, and / or (iii) the value t90-t5 as the difference between the time of t90 of the complex viscosity with 90% of the complex viscosity and the time of t5 of the complex viscosity with 5% of the complex viscosity 10 minutes after the start of mixing is less than or equal to 0.9 minutes. KDP12329WO March 11, 2024 12. The composition according to any one of claims 1 to 11, characterized in that the composition comprises a content of tetraallylsilane.

13. The composition according to any one of claims 1 to 12, characterized in that it comprises at least one surfactant comprising a polyether, polyether-functionalized siloxane oligomer, fatty alcohol, and / or fluorosurfactant, or mixtures of the aforementioned surfactants.

14. The composition according to any one of claims 1 to 13, characterized in that the addition-crosslinking polysiloxanes containing at least two terminal ethylene groups have an ethylene group content of 0.01 mmol / g to 10 mmol / g of ethylene groups, in particular vinyl groups.

15. Composition according to one of claims 1 to 14, characterized in that the molar ratio of Si-H groups of the polysiloxanes to ethylene groups of the polysiloxanes is from 3.5:1 to 10:1,in particular from 6:1 to 10:

1.

16. Composition according to one of claims 1 to 15, characterized in that the curable composition is obtainable by mixing two components to obtain an addition-crosslinking curable composition, wherein the two components comprise: i) base component comprising addition-crosslinking polysiloxanes containing at least two terminal ethylene groups and polydialkylsiloxanes containing Si-H groups, in particular polydialkylsiloxanes containing at least two terminal ethylene groups and polydialkylsiloxanes containing at least two Si-H groups, and ii) catalyst component comprising a hydrosilylation catalyst containing platinum, rhodium and / or palladium and optionally comprising addition-crosslinking polysiloxanes containing at least two terminal ethylene groups and optionally at least two Si-H groups containing polysiloxanes,in particular polydialkylsiloxanes containing at least two terminal ethylene groups, and optionally wherein the base component and / or the catalyst component each independently comprise - optionally inorganic fillers, organic particulate polymers, in particular a particle size of 10 nm to 75 micrometers, and - optionally pigments comprising organic or inorganic pigments. KDP12329WO March 11, 2024 17. Composition according to one of claims 1 to 16, characterized in that the composition is obtainable by mixing an i) base component and ii) catalyst component, wherein i) the base component comprises 30 to 50 wt. % of polydialkylsiloxanes containing at least two terminal ethylene groups, 15 to 64 wt. % of inorganic fillers, 5 to 30 wt. % of polydialkylsiloxanes containing at least two Si-H groups, 1.0 to 15 wt. % of at least one surfactant, and wherein the total sum of the base component is 100 wt. %, and ii) the catalyst component comprises 20 to 80 wt. % of polydialkylsiloxanes containing at least two terminal ethylene groups, 5 to 70 wt. % of inorganic fillers, 0.001 to 5.0 wt. % of platinum, rhodium or palladium containing hydrosilylation catalyst, 0 to 15 wt.% of at least one surfactant, and 0 to 10 wt.-% organic or inorganic pigments and / or structuring agents, the total sum of the catalyst components being 100% by weight.

18. Composition according to one of claims 1 to 17, characterized in that the composition is obtainable by mixing an i) base component and ii) catalyst component, where i) the base component comprises 30 to 50% by weight of polydialkylsiloxanes containing at least two terminal ethylene groups, ii) the catalyst component comprises 20 to 80% by weight of polydialkylsiloxanes containing at least two terminal ethylene groups, and. KDP12329WO March 11, 2024 wherein the ratio of terminal ethylene groups of the base component to terminal ethylene groups of the catalyst component is in a molar ratio of 1:1.1 to 1:10, preferably the molar ratio is from 1:1.2 to 1:10, particularly preferably from 1:1.3 to 1:10, further preferably from 1:1.4 to 1:

2.

19. Kit comprising a 2K dispensing device comprising at least two cartridges, wherein in one cartridge the i) base component according to claim 15 or 16 is present and in the second cartridge the ii) catalyst components according to claim 15 or 16 are present. 20.Use of a composition according to any one of claims 1 to 18 or of a kit according to claim 19 for making impressions in the medical, dental and / or veterinary fields, for making impressions in the botanical field, for making impressions in the marine and aquatic fields, for making impressions of the surfaces of articles, for making impressions of design, art or craft objects, as a dental impression material, as an impression material for human, veterinary or marine soft (tissue) and / or hard structures (bones, shells, coral), oral impressions, podiatry, for making impressions of electronic components, for making impressions of objects whose surfaces are wetted with aqueous compositions or whose surfaces are wetted with water and / or for printing three-dimensional structures, in particular in the semiconductor field.

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