Silicone molding material with accelerated setting, as well as kit and use of the curable composition and kit.

Abstract

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 Si-H group-containing polysiloxanes have a polysiloxane content with a Si-H group content of 4.1 mmol / g to 15 mmol / g, and optionally comprising a hydrosilylation catalyst, and characterized by the fact that it contains polysiloxanes with a Si-H group content of 4.1 to 15 mmol / g, based on the total composition of 100 wt% of the hardenable composition, wherein the polysiloxanes containing Si-H groups with a content of Si-H groups of 4.1 to 15 mmol / g (second polysiloxane composition PS2) are present in a weight ratio of greater than 2 in relation to the polysiloxanes containing Si-H groups with a content of Si-H groups of less than 4.0 mmol / g Si-H groups (first polysiloxane composition PS1).

Description

[0001] The invention relates to a curable composition comprising addition-curable polydialkylsiloxanes containing at least two terminal ethylene groups, with a specific content of Si-H groups and optionally with a specific content of Si-H groups in the molar ratio to the compound of formula I. Further aspects include a kit and the use of the curable composition and the kit.

[0002] Dental impression materials are typically used to capture the spatial arrangement 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 it can, among other things, impair breathing. This can lead to gagging or anxiety and may even result in the impression being aborted. The aim is to accelerate the hardening of the impression material and thus shorten its time in the patient's mouth. At the same time, sufficient working time must be maintained to mix and apply the impression materials. Furthermore, a high level of detail in the impression must be achieved. To this end, these impression materials must flow as well as possible to the tooth and surrounding tissue, even in the moist oral environment.

[0003] 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 added in US 7,700,712 B2. This heating is caused by a reaction of the allylsilanes with the hydride-functional siloxanes contained in the addition-curing silicones. WO 2013 / 025494 A1 states that this heating results in a shortened setting time.

[0004] 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 highly efficient, which, according to WO 2013 / 025494 A1, can result in a temperature increase of up to 20 °C. In our opinion, this will likely be perceived as unpleasant or threatening by patients and may trigger 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 cross-linking.

[0005] DE102016201363A1 discloses compositions crosslinkable to silicone gels with a crosslinker having a very low SiH density and a relatively long chain length. Silicone gels are described therein as established wound adhesives in medicine. DE19757221A1 discloses phosphate-containing olefinic polysiloxanes and mixtures containing polyhydrogen siloxane.

[0006] The object of the invention was to provide curable compositions of addition-curing polysiloxanes that set faster within a defined time window and yet remain readily workable before this time window. In particular, the compositions should not exhibit an undesirable temperature increase despite their rapid setting. A temperature increase of 10 °C or greater is considered undesirable. Furthermore, the impression materials should retain a high level of detail and flow well into the moist oral environment, conforming to the tooth and surrounding tissue.

[0007] The problems were solved by an addition-curing composition according to claim 1; preferred embodiments are disclosed in the dependent claims and in more detail in the description. Also related to the invention is a kit according to claim 17 comprising a 2K dispensing device comprising at least two cartridges, and the use according to claim 18.

[0008] The present invention describes impression materials which, compared to the prior art, have a shortened setting time, in particular shorter time windows for the hardening reaction, and preferably also exhibit a low temperature increase. Furthermore, the setting time t can be 90- t5 is reduced by more than or equal to 10%, in particular more than 20%, compared to 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 examples according to the invention, whereby an advantageous processing time of significantly more than one minute (industrial minute) can be set. The setting time according to the invention can be set to less than 0.9 minutes, whereby the temperature increase of the curable composition can advantageously be set to less than 7.5 °C.

[0009] It was found that for efficient network formation, i.e., a fast hardening response (t), 90 - t5) as the difference between setting time (t 90 ) and processing window (t5), a content of specific Si-H group-containing polysiloxanes must be included in the composition. A particularly efficient setting time (t 90- t5) After reaching the processing time (t5), the temperature can be adjusted within a time of less than 0.85 minutes (industrial minutes) with a simultaneously sufficiently long processing time of ≥ 1.25 minutes (industrial minutes) to optionally less than 1.80 minutes (industrial minutes) and a temperature increase of ≥ 10 °C, in particular ≥ 8 °C. It may be particularly preferred if, in addition, a defined molar ratio of a monounsaturated compound to the Si-H groups is set, in particular a molar ratio of greater than five of Si-H groups to C=C groups, especially vinyl groups, of a monounsaturated compound, i.e., mol Si-H groups / mol C=C groups of a monounsaturated compound. Preferably, the molar ratio is greater than 5 to ≥ 15.

[0010] The inventive curable composition comprises 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 Si-H group-containing polysiloxanes have a Si-H group content of 4.1 mmol / g to 15 mmol / g, and optionally comprising a hydrosilylation catalyst, wherein they comprise 3 to 25 wt% of Si-H group-containing polysiloxanes with a Si-H group content of 4.1 to 15 mmol / g, in relation to the total composition of 100 wt% of the hardenable composition, wherein 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 relation to the Si-H group-containing polysiloxanes with a Si-H group content of less than 4.0 mmol / g Si-H groups.

[0011] Particularly preferred is the adjustment of the content of hydride-functional polysiloxanes in relation to the polysiloxanes containing ethylene groups. Particularly preferably, the polysiloxanes containing at least two Si-H groups are present with a Si-H group content 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 formula I or the content of the monounsaturated compound of formula I in the curable composition is 0.001 to 0.5 wt.%, in particular 0.1 to 0.5 wt.%, wherein the total content of the composition is 100 wt.%.

[0012] It is also preferred to adjust the content of hydride-functional polysiloxanes by using at least two specific polysiloxane compositions with different contents of polysiloxanes having at least two Si-H groups to adjust the network formation, wherein one 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 Si-H groups greater than or equal to 4.1 mmol / g is present in a weight ratio greater than 2, and in particular greater than or equal to 5, compared to the polysiloxane composition with Si-H groups less than or equal to 4.0 mmol / g. It is further preferred that the curable composition does not contain any monounsaturated compound of formula I, or that the content of the monounsaturated compound of formula I in the curable composition is 0.001 to 0.5 wt.%, and in particular 0.1 to 0.5 wt.%, wherein the total content of the composition is 100 wt.%.

[0013] Furthermore, it has proven advantageous to include monounsaturated compounds in the composition, such as low-molecular-weight species comprising monounsaturated compounds with H₂C=CH-CH₂ or H₂C=C(CH₃)-CH₂ groups, or monounsaturated compounds of formula I. It has been found that the presence of monounsaturated compounds in a molar ratio of Si-H groups to monounsaturated compound greater than 5 accelerates crosslinking without causing an undesirable temperature increase.

[0014] 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 with 1 to 16 C atoms, preferably alkyl with 1 to 4 C atoms, and particularly preferably methyl groups.

[0015] Preferably, the composition according to a preferred embodiment comprises essentially monounsaturated compound(s), in particular from 0.01 wt.% to 0.4 wt.%, in particular from 0.04 to 0.4 wt.%, in relation to the total composition of the curable composition of 100 wt.%.

[0016] According to a preferred embodiment, the composition can essentially comprise a monounsaturated compound of formula I. R 2 R 3 C=CR 1 -A-SiR3 (I) with R is each independently selected from H, a monovalent alkyl group with 1 to 22 C atoms, an aryl group with 16 to 12 C atoms, or O-SiR. 4 Group 3, whereby R optionally includes hetero atoms, provided that R is not an alkoxy group or arylalkoxy group. R 1 , R 2 , R 3each independently selected are from H, monovalent alkyl group with 1 to 22 C atoms, aryl group with 6 to 12 C atoms and optionally each independently comprise hetero atoms, R 4 a monovalent alkyl group with 1 to 22 carbon atoms or an aryl group with 6 to 12 carbon atoms, optionally including two or three R groups 4 Remnants in O-SiR 4 3. can form a cyclic or polycyclic structure, A is a bivalent linear, branched or cyclic hydrocarbon group with 1 to 12 C atoms, optionally comprising an aromatic compound with at least one methylene group directly covalently bonded to the aromatic compound, optionally comprising -O atoms, preferably A methylene, ethylene, propylene, butylene, hexylene, octylene, nonylene or decylene, where the molar ratio of Si-H groups, of the Si-H group-containing polysiloxanes, to the monounsaturated compound of formula I is greater than 5.

[0017] In particular, the molar ratio of Si-H groups of the Si-H group-containing polysiloxanes to the C=C group of the monounsaturated compound of formula I is greater than 5.

[0018] Organofunctional silicon compounds are considered to be allylsilanes, particularly monofunctional and / or multifunctional allylsilanes. Preferred allylsilanes do not contain Si-O-Si fragments and are therefore not siloxanes. Particularly preferred compositions contain monofunctional allylsilanes and tetraallylsilane, especially in ratios of 1:0 to 2:1. Preferred allylsilanes comprise 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 3each equal to H, and / or mixtures comprising at least one of the allylsilanes with a tetraallylsilane. Alternatively, the compositions can be free of di-, tri-, or tetrafunctional allylsilanes, or free of di-, tri-, and tetrafunctional allylsilanes.

[0019] 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.) a very fast network (t 90 - t 5 (min.)) with a short setting time.

[0020] To ensure precise control of the processing time and subsequent crosslinking, a specific weight ratio of the polysiloxane composition containing Si-H groups with a Si-H group content greater than or equal to 4.1 mmol / g and the monounsaturated compound of formula I greater than 7 is preferred. Furthermore, it is preferred that the polysiloxane composition with a Si-H group content greater than or equal to 4.1 mmol / g preferably has a weight ratio greater than 2, and in particular greater than or equal to 5, relative to the polysiloxane composition with a Si-H group content less than or equal to 4.0 mmol / g.

[0021] On this side, the curing is correlated with the crosslinking reactions. Crucially, according to the invention, the adjustment 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 of particular importance. Preferred monounsaturated compounds of formula I have a molecular weight of less than 500 g / mol, preferably less than 250 g / mol.

[0022] For the additive crosslinking reaction of hydride-functional polysiloxanes contained in the base component and vinyl-terminated polysiloxanes, which may be contained in both 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, supposedly to accelerate the addition reaction, actually delays the addition reaction disproportionately due to the resulting competition reaction with the monounsaturated compound of formula I, leading to an unfavorable setting behavior of the composition.

[0023] The defined time window of the hardening reaction is determined by the time difference t. 90 - t5 is characterized. Here, t5 corresponds to the processing time, i.e., the time until which an almost stress-free deformation of the impression material is still possible. The time t 90 This corresponds to the setting time. The defined time window of the hardening reaction (t) 90 - t5) corresponds to the difference in setting time (t 90) and processing time (t5), i.e., the time at which a large part of the network has formed and only minimal deformation of the material is still possible. Ideally, the time difference t 90 - t5 should be as short as possible so that the impression can be removed from the patient's mouth quickly. The times are determined by measuring the viscosity, specifically the 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. 90 This 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 base paste and catalyst paste mixture is no longer sticky. The measurement ends after 10 minutes. The time interval t is defined as the time window for the curing reaction or crosslinking. 90The time interval before reaching t5 is defined as the processing window. The term "curable composition" encompassing addition-curable polysiloxanes is used synonymously with "crosslinkable composition." The setting time follows the processing time and results in the defined time window of the curing reaction.

[0024] Furthermore, it is preferred that the time t5 (synonymous with t5) lasts at least 0.75 minutes, preferably greater than or equal to 1 minute, particularly preferably greater than or equal to 1.3 minutes, and most preferably from 1 to 1.6 minutes, which in this case always correspond to industrial minutes (industrial minutes, 60 minutes equals 100 industrial minutes, i.e., = hrs + mins / 60 + sec / 3600), in order to allow for the preparation of the mixture of base component and catalyst component, the application of the composition in the impression tray, the insertion of the impression tray into the patient's mouth, and any optional adjustments. After correct placement of the impression tray in the patient's mouth, particularly rapid curing is desired. This rapid curing is achieved by the time difference t 90 minus t5 in minutes.

[0025] According to the invention, a composition is provided which offers a time window for significantly faster additive curing, preferably less than 0.90 min. for (t 90 -t5) (min.), especially preferably less than 0.7 min. (t 90 -t5) (min.) has.

[0026] Thus, time windows for the curing reaction (t) were determined for the compositions containing allyltrimethylsilane and optionally tetraallylsilane. 90 - t5) of 0.61 minutes (allyltrimethylsilane in base paste) and 0.83 minutes (lower Si-H content)).

[0027] If polysiloxane compositions contain allylsilanes, especially monofunctional and multifunctional allylsilanes, a specifically tailored additive curing of the hydride-functional polysiloxanes and vinyl-terminated polysiloxanes results in a processing time of over one minute and subsequent very short crosslinking within less than 0.85 minutes (industrial minutes).

[0028] The invention also relates to a curable composition comprising addition-crosslinkable organofunctional polysiloxanes, in particular selected from, i. addition-crosslinking polysiloxanes containing at least two terminal ethylene groups, and ii. Polysiloxanes containing at least two Si-H groups, in particular polyhydrogen siloxanes, wherein the Si-H group-containing polysiloxanes comprise at least two polysiloxane compositions with different Si-H group contents, wherein a first polysiloxane composition (PS1) has a Si-H group content of 1 to 3.5 mmol / g and a second polysiloxane composition (PS2) has a Si-H group content 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.

[0029] Preferred polysiloxanes containing at least two Si-H groups have terminal Si-H groups and optionally side-mounted Si groups. Preferred polysiloxanes containing at least two terminal ethylene groups may optionally also include side-mounted ethylene groups. Particularly preferably, polysiloxanes containing at least two terminal ethylene groups comprise terminal divinyl polysiloxanes, particularly preferably divinyl polydialkylsiloxanes, alkyl groups with 1 to 6 carbon atoms, and particularly preferably divinyl polydimethylsiloxanes. Polysiloxanes containing Si-H groups may also be called polyhydrogen siloxanes synonymously.

[0030] Preferred hydrosilylation catalysts include hydrosilylation catalysts containing platinum, rhodium and / or palladium.

[0031] Another preferred embodiment comprises a composition whose maximum temperature rise (ΔT) during curing is less than or equal to 7 °C, wherein the temperature rise is measured using a temperature sensor embedded in the mass at intervals of 15 seconds from the first mixing to 10 minutes after the first mixing, with a temperature measurement being taken particularly every 30 seconds. Furthermore, it is preferred if the value t5 in minutes from the first mixing corresponds to a complex viscosity of 5% and t 90 in minutes of the complex viscosity of 90% of the complex viscosity corresponds to 10 minutes from the first mixture, where t 90 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 less than or equal to 1.8 minutes, 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 -t5 as the difference in time from t 90The complex viscosity with 90% of the complex viscosity and the time 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, and most preferably less than or equal to 0.7 minutes. Here, "from the first mixing" is synonymous with "after" or "from the start of mixing". The maximum temperature rise and t are particularly preferred. 90 -t5 / min. less than 0.9 minutes is acceptable, preferably less than or equal to 0.7.

[0032] The processing time t5 in minutes (industrial minutes), i.e., the time until which an approximately stress-free deformation of the impression material is still possible, is preferably less than or equal to 1.8 minutes, more preferably less than or equal to 1.6 minutes, particularly preferably less than or equal to 1.5 minutes, and more preferably greater than or equal to 1 minute, wherein alternatively or additionally the time window of the hardening reaction (t 90- t5) in minutes 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, optionally with the temperature increase being 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, particularly greater than or equal to 1.0, and less than or equal to 1.8, preferably less than or equal to 1.6.

[0033] Without being bound to the theory, it is assumed that the rapid setting combined with a good processing time results from a weight ratio PS1 / PS2 (PS1 = crosslinker with Si-H (synonymous with 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 groups to vinyl groups ratio of 5 to 9.5, in particular of 6 to 9.3.

[0034] The compositions according to the invention correspond to a free-flowing correction impression material, but in principle the transfer to all consistencies (Type 3 - Type 0 according to DIN EN ISO 4823:2021, DIN EN ISO 4823:2021-06) is possible.

[0035] Particularly preferably, the composition or mixture of the base component and the catalyst component, especially in a ratio of 5:1 to 1:5, more preferably from 1:1 to 2:1 to 1:2, and particularly preferably from 1:1, has 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 Si-H group content of 1.3 mmol / g to 2.5 mmol / g and a second polysiloxane composition (PS2) having a Si-H group content of 4 mmol / g to 8 mmol / g, particularly from 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 molar ratio preferably from 1 : 1.3 to 1 : 10, further preferably from 1 : 1.4 to 1 : 2.

[0036] Furthermore, a preferred composition may include a content of tetraallylsilane. Preferably, a composition may contain 0.001 to 1.0 wt.%, in particular 0.001 to 0.5 wt.%, preferably 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 include tetraallylsilane. It has been found that a certain content of tetraallylsilane in the composition can be advantageously added to extend the processing time, in particular without additive curing within the time window t. 90 -t5 negatively affects the process, 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.

[0037] The significant advantage of the invention is therefore that, through the inventive ratio of polysiloxanes containing at least two terminal ethylene groups and polysiloxanes containing at least two Si-H groups, a very rapid additive hardening can be achieved within a specific time window, whereby the time window can be adjusted to longer processing times by adding tetraallylsilane and the rapid hardening is maintained, so that the total time from mixing to reaching 90% of the Shore A hardness can be less than 3 minutes.

[0038] Furthermore, it is particularly preferred if a composition comprises at least one surfactant comprising a polyether, a polyether-functionalized siloxane oligomer, a fatty alcohol, and / or a fluorosurfactant, or mixtures of the aforementioned surfactants. Preferred surfactants may optionally include at least one nonionic or ionic fluorosurfactant containing at least one fluoroalkyl group. A composition is particularly preferred if it 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 include polyether-functionalized 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 with at least one alkylsiloxane group and optionally a polyether.Particularly preferably, the further surfactant comprises at least one polyether-alkylene-functionalized siloxane oligomer with at least one alkylsiloxane group. By definition, surfactants do not contain Si-H and / or ethylene groups.

[0039] Addition-curing impression materials, in particular, typically contain surfactants to increase their hydrophilicity and thus facilitate their flow onto moist surfaces. In addition to classic non-ionic surfactants, partially fluorinated and / or perfluorinated surfactants, sometimes in combination with classic surfactants, are also used in dental impression materials.

[0040] The surfactant content(s) in the composition can range from 0.1 to 10 wt.%, preferably from 0.1 to 7.5 wt.%, particularly preferably from 0.1 to 5 wt.%, and more preferably from 1 to 3 wt.%, wherein the total composition of the curable composition is 100 wt.%.

[0041] The invention also relates to a composition comprising addition-curing polysiloxanes containing at least two terminal ethylene groups and having an ethylene group content of 0.01 mmol / g to 10 mmol / g, particularly vinyl groups. In particular, the polysiloxanes containing at least two terminal ethylene groups comprise a mixture of terminal ethylene group-containing polysiloxanes EP1 with 0.01 to 0.07 mmol / g vinyl groups and terminal ethylene group-containing polysiloxanes EP2 with 0.1 to 0.5 mmol / g vinyl groups. Preferably, the terminal ethylene group-containing polysiloxanes EP1 comprise polysiloxanes with a vinyl group content of 0.01 to 0.07 mmol / g and a viscosity of 100 mPas to 20.000 mPas (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 1000 to 20000 mPas. The weight ratio of EP1 to EP2 is preferably in the range of 10:1 to 1:10, more 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 in the catalyst component the weight ratio of EP1:EP2 is from 2:1 to 1:10, more preferably from 1.5:1 to 1:2.

[0042] According to a similarly preferred embodiment, a hardenable composition comprises a first polysiloxane composition (PS1) with a Si-H group content of 1 to 3.0 mmol / g, preferably a Si-H group content of 1.3 to 2.5 mmol / g, more preferably a Si-H group content of 1.4 to 2.5 mmol / g, and a second polysiloxane composition (PS2) with a Si-H group content of 4.1 mmol / g to 10 mmol / g, preferably with a Si-H group content of 4.1 to 8.0 mmol / g, in particular 4.1 to 5.0 mmol / g, alternatively preferably with a Si-H group content of 4.1 to 7.0 mmol / g, in particular 4.15 to 6.0 mmol / g.

[0043] Furthermore, it is particularly preferred if the molar ratio of Si-H groups of the polysiloxanes to ethylene groups of the polysiloxanes in the curable composition is from 3.5 : 1 to 10 : 1, in particular from 6 : 1 to 10 : 1.

[0044] Alternatively, the curable composition or a mixture of the base component and the catalyst component preferably comprises polysiloxanes with a Si-H group content or a polysiloxane composition (PS2) with a Si-H group content of 4.1 mmol / g to 8 mmol / g, and optionally, the ratio of terminal ethylene groups in the base component to terminal ethylene groups in the catalyst component is in the molar ratio of 1:1.1 to 1:10, preferably the molar ratio is 1:1.2 to 1:10, particularly preferably 1:1.3 to 1:10, and more preferably 1:1.3 to 1:10. 1.4 to 1 : 2.

[0045] 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, and especially preferably from 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 Si-H group content of 1.3 to 2.5 mmol / g and a second polysiloxane composition (PS2) having a Si-H group content 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 The molar ratio is preferably 1:1.2 to 1:10, particularly preferably 1:1.3 to 1:10, and more preferably 1:1.4 to 1:2.

[0046] Furthermore, a composition is preferably comprising polysiloxanes with a Si-H group content of 1 to 3.5 mmol / g and polysiloxanes with a Si-H group content greater than 4.1 mmol / g in a weight ratio of 1:1 to 1:10, particularly in a weight ratio of 1:4 to 1:6. A composition comprising the first and second polysiloxane compositions as a mixture is also preferably preferred, wherein the first polysiloxane composition (PS1) and the second polysiloxane composition (PS2) are present in a weight ratio of 1:1 to 1:10, particularly in a weight ratio of 1:4 to 1:6.According to a particularly preferred embodiment, the first and second polysiloxane compositions are present as a mixture, wherein the first polysiloxane composition (PS1, polysiloxanes with a Si-H group content of 1 to 3.5 mmol / g) and the second polysiloxane composition (PS2, polysiloxanes with a 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.

[0047] According to a further preferred embodiment, the curable composition is available, is produced or is obtained by mixing two components to obtain an addition-curing composition, wherein the two components comprise, in particular are selected from: a) 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 b) 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, where the base component and / or the catalyst component can each be independent - optional inorganic fillers, organic particulate polymers, especially with a particle size of 10 nm to 75 micrometers, and - optional pigments including organic or inorganic pigments.

[0048] It is preferred that, independently of each other, the base component and / or the catalyst component contains at least one non-ionic or ionic, at least one polyether and / or one polyether-functionalized siloxane oligomer and optionally one or mixtures of the aforementioned surfactants.

[0049] According to an alternative embodiment, a curable composition comprises addition-curable organofunctional polysiloxanes comprising, in particular selected from, i. addition-crosslinking polysiloxanes containing at least two terminal ethylene groups, in particular polysiloxanes containing terminal ethylene groups from 0.01 to 10 mmol / g, 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 polyhydrogen siloxane, wherein the Si-H group-containing polysiloxanes comprise at least two polysiloxane compositions with different Si-H group contents, wherein a first polysiloxane composition (PS1) has a Si-H group content of 1 to 3.0 mmol / g and a second polysiloxane composition (PS2) has a Si-H group content 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 Si-H group content and the second polysiloxane composition (PS2) has a Si-H group content 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 Polysiloxane ratios range from 4:1 to 10:1.

[0050] Furthermore, a composition is preferred in which the polydialkylsiloxanes containing at least two terminal ethylene groups may be selected from vinyl-terminated polydialkylsiloxanes and vinyl-terminated polyether-functional polydialkylsiloxanes, and / or the polydialkylsiloxanes containing at least two Si-H groups may be selected from polydialkylsiloxanes and polyether-functional polydialkylsiloxanes, wherein these may contain terminal Si-H groups and optionally Si(CH3)H groups in the polysiloxane backbone.

[0051] Preferred polysiloxanes comprise polydialkylsiloxanes with alkyl, each independently with 1 to 16 carbon atoms, in particular methyl groups.

[0052] 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.

[0053] Furthermore, the vinyl-terminated polysiloxanes preferably include vinyl-terminated polydialkylsiloxanes and vinyl-terminated polyether-functional polydialkylsiloxanes with a mean molecular weight (mass mean, weight mean) Mw in the range of 31000 g / mol to 124000 g / mol, preferably the number mean Mn is in the range of 22000 g / mol to 89000 g / mol. It is also preferred if the Si-H group-containing polydialkylsiloxanes are selected from polydimethylsiloxanes and polyether-functional polydimethylsiloxanes, each independently with terminal Si-H groups and optionally in the polysiloxane backbone with -Si(CH3)H groups, in particular with a mean molecular weight (mass mean, weight mean) Mw in the range of 500 g / mol to 19000 g / mol, and preferably the number mean Mn is in the range of 500 g / mol to 14000 g / mol.

[0054] 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.

[0055] 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 -Si(CH3)H groups in the polysiloxane backbone, with a Si-H content and optional -Si(CH3)H group content of 4 to 8 mmol / g, particularly from 4.05 mmol / g to 8 mmol / g. It is further preferred that the polydialkylsiloxanes containing Si-H groups are selected from polydialkylsiloxanes and polyether-functional polydialkylsiloxanes, each independently containing terminal Si-H groups and optionally -Si(CH3)H groups in the polysiloxane backbone, exhibiting a viscosity of 10 to 500 mPa·s. The viscosity is determined as described above.

[0056] The terminal ethylene group-containing polydialkylsiloxanes can preferably be selected from vinyl-terminated polydialkylsiloxanes and vinyl-terminated polyether-functional polydialkylsiloxanes, with a vinyl group content in the range of 0.02 mmol / g to 2.0 mmol / g, preferably from 0.02 to 1.0 mmol / g.

[0057] According to an alternative embodiment, a composition is preferred which is obtainable, or obtained, by mixing a i) Basic component and ii) catalyst component, wherein i) the basic component includes 30 to 50 wt.%, in particular 35 to 45 wt.%, polydialkylsiloxanes containing at least two terminal ethylene groups, 15 to 64 wt.%, in particular 30 to 50 wt.%, inorganic fillers, 5 to 30 wt.%, in particular 7 to 25 wt.%, polydialkylsiloxanes containing at least two Si-H groups, 1.0 to 15 wt.%, in particular 1 to 10 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 where the total amount of the base component is 100 wt.%, and ii) the catalyst component comprises 20 to 80 wt.%, in particular 35 to 65 wt.%, polydialkylsiloxanes containing at least two terminal ethylene groups, 5 to 70 wt.%, in particular 35 to 65 wt.%, inorganic fillers, Hydrosilylation catalyst containing 0.001 to 5.0 wt% platinum, rhodium or palladium, 0 to 15 wt% at least one surfactant, in particular 1.0 to 15 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 0 to 10 wt.% organic or inorganic pigments and / or structuring agents, wherein the total amount of catalyst components is 100 wt.%.

[0058] 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 from 2 : 1 to 1 : 2.

[0059] Furthermore, it is preferred if the composition is obtainable or obtained by mixing an i) base component and ii) catalyst component, wherein i) the base component comprises 30 to 50 wt.% polydialkylsiloxanes containing at least two terminal ethylene groups, and ii) the catalyst component comprises 20 to 80 wt% 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 ratio is 1 : 1.2 to 1 : 10, particularly preferably 1 : 1.3 to 1 : 10, further preferably 1 : 1.4 to 1 : 2.

[0060] Nach einer weiteren Alternative ist Gegenstand der Erfindung ein Kit umfassend eine 2K-Abgabevorrichtung umfassend mindestens zwei Kartuschen, wobei in einer Kartusche die i) Basis-Komponente und in der zweiten Kartusche die ii) Katalysator-Komponenten vorliegt. Das Kit kann ferner umfassen mindestens einen abnehmbaren und anbringbaren Statikmischer.

[0061] Verbindungen der Formel I umfassen: H2C=CH-CH2Si(CH3)3 CAS: [762-72- 1], H2C=CH-(CH2)2Si(CH3)3, H2C=CH-(CH2)3 Si(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-C 18 H 37 ), H2C=CH-(CH2)2Si(CH3)2(n-C 18 H 37 ), H2C=CH-(CH2)3Si(CH3)2(n-C 18 H 37 ), H2C=CH-(CH2)4Si(CH3)2(n-C 18 H 37 ), H2C=CH-(CH2)8Si(CH3)2(n-C 18 H 37), 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(nC 18 H 37), 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(-O-Si(CH3)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)3 Si(OC2H5)3, H2C=CH-(CH2)4Si(OC2H5)3, H2C=CH-(CH2)8Si(OC2H5)3, H2C=CH-CH2Si(C6H5)3 CAS: [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)-CH2Si(CH3)3 CAS: [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, und Mixtures of these.

[0062] Preferably, at least one further surfactant is 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 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.

[0063] Further preferably, the surfactant comprises at least one further surfactant or is selected from polyethers and polyether-functionalized siloxane oligomers, wherein the siloxane oligomer contains at least one alkyltrisiloxane group, preferably a polyalkylene oxide-functionalized heptamethyltrisiloxane, further preferably a polyethylene oxide-alkylene-functionalized heptamethyltrisiloxane, particularly preferably 3-(2-methoxyethoxy)propylmethyl-bis(trimethylsilyoxy)silane.

[0064] 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.

[0065] The polyalkylene oxide groups of the polyether-functionalized siloxane oligomers are preferably selected from polyethylene oxide groups, methoxy-polyethylene oxide-alkylene groups, ethoxy-polyethylene oxide-alkylene groups, methoxy-ethoxy-alkylene groups, and polyethylene oxide-alkylene groups. A polyalkylene oxide-functionalized alkyltrisiloxane is preferred, as is 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. Further preferred surfactants include 3-(2-methoxyethoxy)propyl-methyl-bis(trimethylsilyoxy)silane.

[0066] Polyethers comprise α- and / or ω-polyethers of alkenyl polyethers, alkynyl polyethers, hydroxy polyethers, aryloxy-, arylalkyloxy-, and / or alkoxy-terminated polyethers. Preferred polyethers include α-alkenylene ω-alkyl polyethers with alkenyls at C1 to C8 and alkyls at C1 to C4, preferably allyl polyethylene glycol methyl ether (CAS 27252-80-8) and / or α,ω-alkyl polyethers with alkyls at C1 to C4. The additional surfactant may preferably be a mixture of polyethers and polyether-functionalized siloxane oligomers.

[0067] Polyethers according to the present invention can comprise C2 to C4 alkylene oxides as surfactants or polyether-functional polydialkylsiloxanes containing terminal ethylene groups.

[0068] The terminal-ethylene-group-containing polyether-functional polydialkylsiloxanes 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, trimethyl olethane, or trimethylolpropane, pentaerythritol, or sugar alcohols, or mixtures of two or more of these with the aforementioned alkylene oxides, which are suitable for forming the polyether polyols.

[0069] Suitable hydrosilylation catalysts containing platinum, rhodium, or palladium are understood to be platinum-, rhodium-, or palladium-containing catalysts or their precatalysts that can be dissolved in the siloxanes and preferably in the components. Catalysts that do not form a dispersed phase in the other compounds present in the components are therefore preferred. 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 divinyl disiloxanes such as (CH₂=CH)Me₂Si-O-SiMe₂(CH=CH₂)). Karstedt catalysts may 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]platin(0)(lCy)Pt(vs); [1,3-Bis(2,6-diisopropylphenyl)imidazol-2-ylidene][1,3-divinyl-1,1,3,3,-tetramethyldisiloxane]-platin(0), (IPr)Pt(vs).

[0070] Alternatively, 1 to 10 mol% of the methyl groups in the siloxane backbone of the polydimethylsiloxanes can be substituted by alkyl groups with C2 to C16, particularly C2 to C8, and / or phenyl groups. Alternatively, allyl-terminated polydialkylsiloxanes or allyl-terminated polyether-functional polydialkylsiloxanes can also be used.

[0071] Furthermore, compositions are preferred in which the vinyl-terminated polydialkylsiloxanes and vinyl-terminated polyether-functional polydialkylsiloxanes have a mean molecular weight (mass average, weight average) Mw in the range of 31,000 g / mol to 124,000 g / mol, preferably the number average Mn is in the range of 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 a mean molecular weight (mass average, weight average) Mw in the range of 500 g / mol to 19,000 g / mol, and preferably the number average Mn is in the range of 500 g / mol to 14,000 g / mol. g / mol. The determination of Mw and Mn can be carried out by gel permeation chromatography (SDB copolymer with eluent toluene).

[0072] Likewise, compositions are preferred that comprise polydialkylsiloxanes containing terminal ethylene groups, 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 Si-H group-containing polydialkylsiloxanes are selected from polydialkylsiloxanes and polyether-functional polydialkylsiloxanes containing terminal Si-H groups and optionally Si(CH3)H groups in the polysiloxane backbone having a viscosity of 10 to 500 mPa·s, in particular 20 to 50 mPa·s (DIN 53015 Höppler Kugel 3) and optionally 200 to 340 mPa·s (DIN 53015 Höppler Kugel 4). The viscosity is generally determined using (DIN 53015 Höppler), whereby for polydialkylsiloxanes containing ethylene groups the viscosity is determined using rotational viscosity cone (4° / 40 mm) / plate BU-Q 30.027) U0,2 / U1: DIN 53015 Höppler Kugel 5 can be applied.

[0073] Likewise, a hardenable composition, base and / or catalyst component comprising Si-H group-containing polydialkylsiloxanes of a first polysiloxane composition is preferred, comprising the terminal Si-H groups and optionally -Si(CH3)H groups contained in the polysiloxane backbone, wherein the content of Si-H and optionally of -Si(CH3)H groups in the polysiloxane backbone is from 1 to 3.5 mmol / g, preferably the content is from 1 to 2 mmol / g. Also preferred are compositions comprising a base and / or catalyst component comprising Si-H groups of a second polysiloxane composition, which include the terminal Si-H groups and optionally -Si(CH3)H groups contained in the polysiloxane backbone, wherein the content of Si-H and optionally of -Si(CH3)H groups in the polysiloxane backbone is from 3.8 to 15 mmol / g, preferably from 4 to 8, in particular from 4.05 to 8 mmol / g.

[0074] 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 Polydialkylsiloxanes containing 30 to 50 wt.%, in particular 20 to 39 wt.%, terminal ethylene groups, 15 to 64 wt.%, in particular 36 to 63 wt.%, 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 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 having at least one alkylsiloxane group, or mixtures of these surfactants, preferably the further surfactant being 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 amount of components in the base component is 100 wt.%, and ii) includes Polydialkylsiloxanes containing 20 to 80 wt.%, in particular 30 to 80 wt.%, terminal ethylene groups, especially 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-functionalized siloxane oligomer, 0 to 10 wt.% organic or inorganic pigments and / or structuring agents, wherein the total amount 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 a composition of 2.0 to 20 wt.%.

[0075] Structuring agents such as Aerosile or similar substances can be used. Palladium-containing compositions can be added to the curable compositions as hydrogen scavengers. Inorganic fillers, such as organic particulate polymers, can include silicon dioxide, fumed silica, precipitated silica, quartz, and kaolin, preferably hydrophobic. Other suitable surfactants include fatty alcohols, such as ethoxylated fatty alcohols, particularly C11 to C14 alcohols.

[0076] In a preferred embodiment, the base component and the catalyst component can be mixed in a weight ratio of approximately 1:1 to 10:1, preferably approximately 1:1, 5:1, 4:1, or 10:1. Particularly preferably in a weight ratio of 2:1 to 1:2, and more preferably 1:1 with a deviation of + / - 15 wt.%.

[0077] The invention also relates to the use of the composition for creating impressions in the medical, dental and / or veterinary fields, for creating impressions in the field of botany, for creating impressions in the marine and aquatic fields, for molding the surfaces of articles, for molding 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 molding electronic components, for molding objects whose surfaces are wetted with aqueous compositions or whose surfaces are wetted with water and / or for printing three-dimensional structures, particularly in the semiconductor field.

[0078] The compositions according to the invention are suitable as impression materials where a high degree of detail accuracy is required. Impression materials, in particular dental impression materials, include precision impression materials, diagnostic impression materials, bite registration materials, duplicating materials (applicable for duplicating master models, such as all-ceramic restorations, inlays, onlays, cantilevers), as well as modeling materials such as those used for gingival reconstruction.

[0079] The following are exemplary embodiments intended to illustrate the invention without limiting it to specific examples. Examples:

[0080] The figures show: Fig. 1: Complex viscosity (η*(t5), η*(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 A hardness 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 constant content of the compound of formula I, here ATMS). Fig. 3: Variation of the allyl silane content (ATMS) with non-inventive compositions (US7700712B2, Ex. D), wherein ATMS contents (1.5 wt.% ATMS, 0.4 wt.%, 0.0 wt.% ATMS), where ATMS content was replaced by crystalline SiO2, ΔT 6.3 °C to 4.5 °C

[0081] The base pastes (base component) and catalyst pastes (catalyst component) were each homogenized separately in a planetary mixer. For the subsequent experiments, 60 g batches of each paste were prepared in Hauschild beakers. The prepared base paste and catalyst paste were then filled into cartridges. Using a static mixer, the base paste and catalyst paste were mixed in a 1:1 weight ratio in the following examples. Viscosity measurements

[0082] According to Fig. 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]. The shear rate was continuously increased to 8 Hz, and the viscosity was measured at 3 Hz after a subsequent decrease in the shear rate. The complex viscosity after 10 min corresponds to the maximum value, t 90t5 corresponds to the time at 90% of this value and t5 to the time at 5% of the maximum value.

[0083] Procedure: The complex viscosity during curing is measured using a rheometer at 30 °C. Measurement conditions for viscosity measurement Device RheoStress 1 Manufacturer Thermo Scientific Measuring device Panel / panel, profiled Measurement geometry P20 Ti LS measuring plate attachment MPC20 S Type of rotating body PP20PRO. Measuring temperature 30°C Measurement frequency 1.0 Hz Shear stress 800 Pa Gap height 0.5 mm Gap volume 0,2 ml Rotation mode CS Measurement type oscillation Measurement duration No change in the viscosity curve is visible = abort, or max 10 min

[0084] The sample quantity was: m = (1.0 ± 0.1) g

[0085] The Shore A hardness (DIN 53505:2000-08) is measured every 30 seconds at (23±2) °C as soon as the test specimen is no longer sticky to the mixture of base and catalyst paste; i.e., the first measurement is taken as soon as the film can be removed from the material. The last measurement is taken 10 minutes after mixing the aforementioned pastes.

[0086] The final viscosity is read after 10 minutes, and from this the values ​​t5 (time at 5% of the final viscosity) and t 90(Time at 90% of final viscosity) is calculated. The times are obtained by extrapolating the curves at the corresponding viscosity value.

[0087] A relative Shore A hardness is calculated by normalizing to the Shore A hardness value at t = 10 min. Then, a time t is measured. SH calculated as the difference between the first possible measurement and the time after which 90% of the Shore hardness is reached within 10 minutes. The shorter the time, the better. SH The longer the material is, the faster it hardens.

[0088] The difference from 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 The higher the -t5 value, the faster the composition hardens within this time window. Table 1: Shore hardness A, tSH (min.), t = (t90-t5) (min.), ΔT (°C) Example 1 Example 2 comparative example Bsp. D US7700712B2 Comparative example (WO2013 / 025494) 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 ΔT (°C) 7,4 7,3 5,7 11,7 Temperature measurement

[0089] Description of the method: 1. A tube (21 mm diameter laminate tube = aluminum tube coated with plastic) is cut to a length of about 5 cm. 2. By dispensing material from a cartridge using a static mixer (1:1 systems, 5:1 with a dynamic mixer), the tube is filled with material until it contains approximately 8 g. The timer starts when the material is first dispensed from the cartridge. The quantities were weighed after the experiment. 3. The temperature sensor of the measuring device (type: Testo 925) is placed in the mass. After 15 seconds, the first measurement is recorded. 4. From 30 seconds onward, the temperature is recorded every 30 seconds until 10 minutes. By then, the maximum temperature had already been reached in all samples, and the temperature was steadily decreasing. 5. The sample is removed from the temperature measuring device and the sample is weighed (m = 8 g + / - 0.5 g). Polymethylsiloxane mixture (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) Examples according to the invention and modified reference example:

[0090] 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) Polydimethylsiloxane mixture (PDMS oil):

[0091] The vinyl content in the catalyst pastes of the following examples is: C=C group content: 0.088 mmol / g

[0092] 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 on the vinyl content or C=C content is disclosed, therefore the vinyl content was set analogously to the above base and catalyst pastes. Crosslinking agent: 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)

[0093] The mixing ratio of base paste and catalyst paste is 1:1 unless otherwise specified. The following examples according to the invention and further examples were all carried out with the same mixture of PDMS oil (polydimethylsiloxane). Therefore, the examples given as reference examples are not comparative examples from the prior art, but internal reference examples. Examples 1 to 3 are according to the invention. Example 4 is not according to the invention. Table 2: Comparison examples and modified reference example Comparative example WO 2013 / 025494 Example 1 (B / A) Mod. Reference example with PS2 Comparison example 1 Example D US 7700712B2 1 : 1 Comparison example A Example A US 7700712B2 5 : 1 3% allyltrimethylsilane in base 3% allyltrimethylsilane in cat Base [wt.%] Catalyst [wt.%] Base [wt.%] Catalyst [wt.%] Base [wt.%] Catalyst [wt.%] Base [wt.%] Catalyst [wt.%] PDMS mixture 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 - Pyrogenic 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 formula 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 SH 0:00 0:00 4:30 01:00 PS1:PS2 weight ratio **or for the non-inventional PS1:PS 1 : 2,04 1 : 1,81 1 : 1,16 - * Vinyl groups with their own silicone oil content were reworked as a comparison example. Table 3: Examples 1 to 4 (Base paste, catalyst paste) Example 1 Example 2 Example 3 Example 4 Base [wt.%] Catalyst [wt.%] Base [wt.%] Catalyst [wt.%] Base [wt.%] Catalyst [wt.%] Base [wt.%] Catalyst [wt.%] PDMS mixture 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 Pyrogenic 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 formula I 9,53 8,68 8,52 6,91 t 5 1 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

[0094] 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 in the time difference t was observed. 90- t5 (0.61 min. (Example 1) vs 0.83 min. (Example 4, not according to the invention) and a greater increase in Shore A hardness (see Fig. 2, Fig. 0, Fig. 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). Compared to the prior art WO 2013 / 025494 A1 (content of monofunctional allylsilane based on total composition - with the modification that the content of ethylene groups was chosen analogously to the compositions according to the invention - a temperature increase of about 7 °C can already be achieved with a comparatively small amount of monofunctional allylsilane (0.4 wt% based on total composition) and a ratio of Si-H groups (X) to allyl groups (Y) of the compound of formula I of X / Y > 5. Alternatively or additionally, the time difference t 90- t5 from 0.94 (composition with 1.5 wt% allyltrimethylsilane based on total composition and a molar ratio greater than X / Y (SiH: C=C of formula I) greater than or equal to 9.1) to 0.61.

[0095] Fig. Figure 3 shows that at a low molar ratio of X / Y (SiH / C=C of formula I) according to comparative example 1 (Ex. D, US 7700712 B2), allyltrimethylsilane has no effect on the increase in Shore A hardness, i.e., the setting reaction. The addition of allyltrimethylsilane only leads to a slight temperature increase from 4.5 °C to 6.4 °C.

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, and characterized by , that it contains 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, wherein the polysiloxanes containing Si-H groups having a content of Si-H groups of 4.1 to 15 mmol / g (second polysiloxane composition PS2) are present in a weight ratio of greater than 2 with respect to the polysiloxanes containing Si-H groups having a content of Si-H groups of less than 4.0 mmol / g Si-H groups (first polysiloxane composition PS1). [2] Composition according to claim 1, characterized by that the curable composition comprises a monounsaturated compound of formula I R2R3C=CR1−A−SiR3 with R is each independently selected from H, monovalent alkyl group having 1 to 22 C atoms, aryl group having 16 to 12 C atoms, O-SiR 4 3-group, where R optionally comprises hetero atoms, with the proviso that R does not comprise an alkoxy group or arylalkoxy group, R 1 , R 2 , R 3are 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 4 3 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 formula I is greater than 5. [3] Composition according to claim 1, characterized by that the molar ratio of Si-H groups of the polysiloxanes, of the polysiloxanes containing at least two Si-H groups with 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 any one of claims 1 to 3, characterized by that the curable composition does not contain a 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 any one of claims 1 to 4, characterized by that the ii. polysiloxanes containing at least two 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 4.1 mmol / g to 15 mmol / g, 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, 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 any one of claims 1 to 5, characterized bythat the polysiloxanes containing Si-H groups with a content of Si-H groups of 4.1 to 15 mmol / g (second polysiloxane composition PS2) are present in a weight ratio of greater than or equal to 5 with respect to the polysiloxanes containing Si-H groups with a content of Si-H groups with 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 any one of claims 2 to 6, characterized by 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. [8] Composition according to any one of claims 1 to 7, characterized bythat 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. [9] Composition according to any one of claims 2 or 8, characterized by 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.%. [10] Composition according to any one of claims 1 to 9, characterized by that the composition includes a content of tetraallylsilane. [11] Composition according to any one of claims 1 to 10, characterized by 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. [12] Composition according to any one of claims 1 to 11, characterized by 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 ethylene groups, in particular vinyl groups. [13] Composition according to any one of claims 1 to 12, characterized by 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. [14] Composition according to any one of claims 1 to 13, characterized by that the curable composition is obtainable by mixing two components to obtain an addition-curing curable composition, wherein the two components comprise: a) 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 b) 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 polysiloxanes containing at least two Si-H groups, 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 with a particle size of 10 nm to 75 micrometers, and - optional pigments comprising organic or inorganic pigments. [15] Composition according to any one of claims 1 to 14, characterized by that the composition is obtainable by mixing a i) Basic component and ii) catalyst component, wherein i) the basic component includes 30 to 50 wt.% polydialkylsiloxanes containing at least two terminal ethylene groups, 15 to 64 wt.% 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 of the base component is 100 wt.%, and ii) the catalyst component comprises 20 to 80 wt.% polydialkylsiloxanes containing at least two terminal ethylene groups, 5 to 70 wt.% inorganic fillers, Hydrosilylation catalyst containing 0.001 to 5.0 wt.% platinum, rhodium or palladium, 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 wt.%. [16] Composition according to any one of claims 14 or 15, characterized by that the composition is obtainable by mixing a i) Basic component and ii) catalyst component, 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. [17] Kit comprising a 2K dispensing device comprising at least two cartridges, wherein in one cartridge the i) base component according to claim 14 is present and in the second cartridge the ii) catalyst components according to claim 14 are present. [18] Use of a composition according to any one of claims 1 to 16 or of a kit according to claim 17 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 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 tissues and / or hard structures, 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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