Two-component addition-cross-linking silicone impression material comprising vinyl polysiloxanes with a high tensile strength, preferably to be used as material for taking impressions of surfaces, particularly preferably as a dental impression material

Abstract

The invention relates to a curable composition, in particular a polymerizable composition, having addition-crosslinkable polydialkylsiloxanes, which contain at least two terminal-ethylene groups, and polydialkylsiloxanes, which contain at least two Si-H groups, comprising fillers and a compound as a premixture.

Description

[0001] KDP12312WO March 17, 2026

[0002] Two-component addition-curing silicone impression material comprising vinyl polysiloxanes with high tensile strength, preferably used as a material for impressioning surfaces, particularly preferably as a dental impression material.

[0003] The invention relates to a curable, in particular polymerizable, composition comprising addition-crosslinkable polydialkylsiloxanes containing at least two terminal ethylene groups and polydialkylsiloxanes containing at least two Si-H groups, comprising fillers and a compound as a premix.

[0004] Up to now, addition-curing silicones, used as two-component (2K) formulations (i.e., two separate compositions that polymerize upon mixing), have been optimized for creating or molding surfaces, particularly medical and especially dental surfaces. These optimizations have focused on either high tensile strength, such as products from Dentsply, or high elongation at break, such as Külzer Dental's Flexitime Correct Flow. Some specialized impression materials, such as Memosil, have been optimized as two-component addition-curing silicones for high tensile strength combined with high transparency and low elastic deformation. Others, such as Memoreg from Külzer Dental, have been optimized as two-component addition-curing silicones for high hardness combined with high tensile strength and low elastic deformation.

[0005] In a force-displacement-strain diagram recorded during tensile testing of materials, the relative strain until fracture, in relation to the original dimension, yields the "strain at break," and the maximum force at break yields the "tensile strength." The energy absorbed by the material is proportional to the area under the force / strain curve and is called the tensile energy. Relating this to the cross-sectional area of ​​the specimen gives the tensile strength (toughness (N / mm²)). 2 )).

[0006] Some manufacturers, such as 3M ESPE or Külzer Dental, optimized their dental impression materials, such as Express 2, Flexitime Light Flow, and Flexitime Medium Flow, by moderately increasing the toughness value to achieve good elongation at break while maintaining high tensile strength. However, this value is limited with conventional formulation components. Selected toughness values ​​(N / mm²) 2) of Express 2 Light Body approx.

[0007] 2.4 (N / mm²) 2 ), Identium Light approx. 2.1 (N / mm 2 ), Aquasil Ultra LV approx. 1.9 (N / mm 2 ), Panasil contact plus x-light approx. 1.6 (N / mm 2 ), Impregnum Garant L DuoSoft (1.55 (N / mm 2 ) Affnis light body (1 ,9KDP12312WO 17 March 2026

[0008] (N / mm 2 ) and Flexitime Medium approx. 2.7 (N / mm²) 2 ); Measurements by the Thermoplastic Testing Center, Bayer Materials AG, Krefeld-Uerdingen, Germany, March 2009.

[0009] However, ideal impression materials, especially those used for deeply prepared teeth, should have high tensile strength to prevent material from tearing during demolding. Even this high tensile strength is often insufficient in practice to reliably capture undercuts, tapered areas in the interdental spaces. Due to the very thin layer thickness of the impression material used in these situations, tearing can occur, leaving material remnants in the interdental spaces or sulcus. Only if the impression material also possesses high tensile strength can it expand sufficiently to glide over undercuts and curved teeth without tearing during demolding / removal of the tray.Problems arise when fragments of the impression material remain in the interdental spaces or sulcus, as these can lead to discomfort and even severe inflammation in the patient's mouth within a few days. Furthermore, an incomplete representation of the sulcus hinders the accurate reproduction of the oral situation when subsequently pouring plaster or scanning the impression with an impression scanner.

[0010] WO98 / 53791A2 discloses a molding material with high tensile strength and a content of special QM resins. The achievable tensile strengths are 1.38 N / mm². 2 For low-viscosity impression materials and max. 2.06 N / mm² 2In the case of higher viscosity impression materials, the use of compounds (premixes, mixtures) to achieve high transparency in bite registration materials is known from EP0522341B1. This patent describes not only the use of compounds but also the use of QM resins to provide elastomers with high transparency, tensile strength, and hardness. EP0522341B1 also mentions the low elastic deformation of the materials disclosed therein. DE2535334A, which is cited by EP0522341B1, also discloses a material with a QM-containing compound in the impression material, where high hardness and viscosity are to be achieved.

[0011] Therefore, one object of the present invention was to provide an impression material that exhibits significantly improved tensile strength (toughness). Furthermore, the object was to provide an impression material with which, in particular, the impression of the sulcus could be made with exceptional detail and, at the same time, with exceptional reliability. Therefore, another object of the invention was to provide an impression material KDP12312WO 17 March 2026

[0012] The task was to provide a material that flows particularly easily, even on damp surfaces and especially in narrow lumens, and simultaneously exhibits particularly high elongation at break, tensile strength and / or tensile energy, and especially exceptional toughness, after curing. Furthermore, the task involved providing a "sulcus impression material".

[0013] The object of the invention was to provide molding compounds with low viscosity that have a comparatively low hardness but high elongation at break and at the same time good tensile strength and a particularly high toughness (tensile strength).

[0014] In contrast to the aforementioned preliminary descriptions, the present invention disclosure describes materials which have a low viscosity (e.g. according to classification according to DIN ISO 4823: 2021; types 2 or 3), a comparatively balanced hardness, and high elongation at break, which together with good tensile strength exhibit an exceptionally high toughness.

[0015] 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 21 comprising a 2K dispensing device comprising at least one cartridge with two chambers or two cartridges, each with one chamber, and the use according to claim 22.

[0016] The present invention describes impression materials which, compared to the prior art, have a high tensile strength (toughness, N / mm²). 2 ) and preferably high tensile strength (N / mm²) 2 exhibit.

[0017] It has been found that for achieving high tensile strength and high toughness (synonymous with tensile strength), compositions comprising a mixture, here a compound or premix – here – iii. mixture – comprising addition-crosslinking linear polysiloxanes having at least two terminal ethylene groups and an inorganic filler, the surface of which is at least partially provided with covalently bonded hydrocarbon groups, can be used to achieve high toughness and / or high tensile strength. It is particularly preferred if the filler has -Si(CH3)3 and / or -Si(CH3)2 vinyl groups as hydrocarbon groups, particularly preferably a mixture thereof. Furthermore, it is preferred if the content of free hydroxyl groups in the filler is particularly low. Moreover, it is particularly preferred if the 2K-KDP12312WO 17 March 2026

[0018] A composition, comprising two separate compositions A and B, for the production of a curable, in particular polymerizable, preferably addition-curing, composition, has a molar ratio of polysiloxanes containing SiH groups to polysiloxanes containing terminal ethylene groups of less than 8, in particular 8:1 to 1:1, preferably less than 4, in particular 4:1 to 2:1, in particular less than or equal to 3.5, preferably 3.5:1 to 2:1. The 2K compositions are particularly preferred for use as dental, veterinary, and / or medical products. Furthermore, it is particularly preferred to use the 2K compositions, in particular comprising composition A and / or B, as a product for impressioning moist surfaces.

[0019] For the additive crosslinking reaction of hydride-functional polysiloxanes, which are contained in composition B as the base component, and vinyl-terminated polysiloxanes, which may be contained in composition B as the base component and in composition A as the catalyst component, such as at least one hydrosilylation catalyst, these must be able to coordinate, for example, to a hydrosilylation catalyst, such as a platinum catalyst. It has now been found that a specific ratio of at least two polysiloxane compositions, and in particular three polysiloxane compositions, each with a defined molar content of terminal ethylene groups, in a specific ratio to polysiloxanes with at least two SiH groups, leads to high toughness of the addition-crosslinked compositions.

[0020] The term "curable composition" encompassing addition-curable polysiloxanes is used synonymously with "crosslinkable composition".

[0021] The invention relates to a curable composition comprising addition-curable organofunctional polysiloxanes. According to a particularly preferred embodiment, the invention relates to a two-component (2K) composition, in particular comprising two separate compositions, most preferably a mixed and curable 2K composition obtainable by mixing composition A and composition B, or a polymerized 2K composition obtainable by mixing compositions A and B and polymerizing them. According to an alternative, the invention relates to a curable or polymerizable composition suitable as an impression material, in particular as a dental impression material and / or as an impression material for three-dimensional surface structures with undercut(s), in particular for three-dimensional surface structures with gaps, channels, and / or grooves, optionally having undercut(s).The gaps, channels and / or grooves with openings can be KDP12312WO 17 March 2026.

[0022] The respective openings have a distance of less than 3 mm to less than 1 mm, preferably around 2.0 mm.

[0023] The invention thus relates to a 2K composition which exists as two separate compositions A and B for the production of a curable composition, wherein

[0024] a. Composition A comprises addition-crosslinkable organofunctional polysiloxanes

[0025] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, in particular vinyl-terminated dimethylpolysiloxanes with 25 to 2500 siloxane units, preferably with 80 to 2000 siloxane units, particularly preferably unbranched dimethylpolysiloxanes, preferably a mixture of polysiloxanes comprising polysiloxanes with 1) 25 to 420 siloxane units, preferably 100 to 400 siloxane units, 2) polysiloxanes with 420 to 550 siloxane units, 3) polysiloxanes with 580 to 920 siloxane units and / or 4) polysiloxanes with 980 to 2500 siloxane units, particularly 980 to 1300 siloxane units, preferably a mixture comprising at least two of the aforementioned polysiloxanes, further preferably a mixture comprising polysiloxanes 1), 2) and 3), preferably with a

[0026] ii. inorganic filler comprising cristobalite,

[0027] iii. Mixture, in particular premixture, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, in particular vinyl-terminated dimethylpolysiloxanes with 25 to 2500 siloxane units, preferably unbranched dimethylpolysiloxanes, preferably a mixture of polysiloxanes as defined above, comprising 1), 2), 3) and / or 4), particularly preferably polysiloxanes 2) with 420 to 550 siloxane units or a mixture comprising polysiloxanes 2) and polysiloxanes selected from 1), 3) and 4), and

[0028] inorganic filler whose surface has at least partially covalently bonded hydrocarbon groups, as well as

[0029] iv. optionally at least one or more additive(s), pigment(s) and / or dye(s), and v. optionally comprising a hydrosilylation catalyst, and the

[0030] b. Composition B comprises

[0031] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, in particular vinyl-terminated dimethylpolysiloxanes with 25 to 2500 siloxane units, preferably unbranched dimethylpolysiloxanes, in particular vinyl-terminated dimethylpolysiloxanes with 25 to 2500 siloxane units, preferably with 300 to 2000 siloxane units, particularly preferably unbranched dimethylpolysiloxanes, KDP12312WO 17 March 2026

[0032] preferably a mixture of polysiloxanes comprising polysiloxanes with 1) 25 to 420 siloxane units, preferably 100 to 400 siloxane units, 2) polysiloxanes with 420 to 550 siloxane units, 3) polysiloxanes with 580 to 920 siloxane units and / or 4) with 980 to 2500 siloxane units, in particular from 980 to 1300 siloxane units, preferably a mixture comprising at least two of the aforementioned polysiloxanes, further preferably a mixture comprising polysiloxanes 1), 2) and 3), preferably with a

[0033] ii. inorganic filler comprising cristobalite,

[0034] iii. Mixture, in particular premixture, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, in particular vinyl-terminated dimethylpolysiloxanes with 25 to 2500 siloxane units, preferably unbranched dimethylpolysiloxanes, preferably a mixture of polysiloxanes as defined above, comprising 1), 2), 3) and / or 4), particularly preferably polysiloxanes 2) with 420 to 550 siloxane units or a mixture comprising polysiloxanes 2) and polysiloxanes selected from 1), 3) and 4), and an inorganic filler whose surface has at least partially covalently bonded hydrocarbon groups, as well as

[0035] iv. optionally at least one additive(s), pigment(s) and / or dye(s).

[0036] v. polysiloxanes containing at least two Si-H groups.

[0037] The invention relates in particular preferably to a 2K composition which exists as two separate compositions A and B for the production of a curable composition, wherein

[0038] a. Composition A comprises addition-crosslinkable organofunctional polysiloxanes

[0039] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, in particular vinyl-terminated dimethylpolysiloxanes with 100 to 1300 siloxane units, preferably with 300 to 1300 siloxane units, particularly preferably with 100 to 400 and with 500 to 1300 siloxane units, preferably unbranched dimethylpolysiloxanes,

[0040] ii. inorganic filler comprising cristobalite,

[0041] iii. Mixture, in particular premixture, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, in particular vinyl-terminated dimethylpolysiloxanes with 100 to 1300 siloxane units, preferably 420 to 550 siloxane units, preferably unbranched dimethylpolysiloxanes, and an inorganic filler whose surface has at least partially covalently bonded hydrocarbon groups, as well as KDP12312WO 17 March 2026

[0042] iv. optionally at least one additive(s), pigment(s) and / or dye(s), and

[0043] v. optionally comprising a hydrosilylation catalyst, and the

[0044] b. Composition B comprises

[0045] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, in particular vinyl-terminated dimethylpolysiloxanes with 100 to 1300 siloxane units, preferably with 300 to 1300 siloxane units, particularly preferably with 100 to 400 and with 500 to 1300 siloxane units, preferably unbranched dimethylpolysiloxanes, preferably with a

[0046] ii. inorganic filler comprising cristobalite,

[0047] iii. Mixture, in particular premixture, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, in particular vinyl-terminated dimethylpolysiloxanes with 100 to 1300 siloxane units, preferably 420 to 550 siloxane units, preferably unbranched dimethylpolysiloxanes, and an inorganic filler whose surface has at least partially covalently bonded hydrocarbon groups, as well as

[0048] iv. optionally at least one additive(s), pigment(s) and / or dye(s),

[0049] v. polysiloxanes containing at least two Si-H groups.

[0050] Furthermore, the composition may include a opacifying agent in A and / or B or in the overall composition.

[0051] The invention also relates to a curable or cured 2K composition comprising

[0052] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, in particular vinyl-terminated dimethylpolysiloxanes with 80 to 1300 siloxane units, preferably with 150 to 1300 siloxane units, particularly preferably with 80 to 400 and with 500 to 1300 siloxane units, preferably unbranched dimethylpolysiloxanes,

[0053] ii. inorganic filler comprising cristobalite,

[0054] iii. Mixture, in particular premixture, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, in particular vinyl-terminated dimethylpolysiloxanes with 100 to 1300 siloxane units, preferably 420 to 550 siloxane units, preferably unbranched dimethylpolysiloxanes, and an inorganic filler whose surface has at least partially covalently bonded hydrocarbon groups, as well as

[0055] iv. optionally at least one additive(s), pigment(s) and / or dye(s), and KDP12312WO 17 March 2026

[0056] v. optionally comprising a hydrosilylation catalyst, and the

[0057] vi. polysiloxanes containing at least two Si-H groups, wherein the composition preferably comprises a filler fraction whose surface has at least partially covalently bonded hydrocarbon groups of 6 to 20 wt.% from the

[0058] iii. Mixture, in particular of 10 to 75 wt.%, preferably of 10 to 20 wt.% or alternatively of 20 wt.% to 65 wt.%, with respect to the composition as a total composition of 100 wt.%.

[0059] The invention also relates to a curable or cured 2K composition comprising

[0060] i. 15 to 60 wt.% addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, in particular 20 to 50 wt.%,

[0061] ii. 5 to 45 wt.% filler comprising cristobalite, in particular 10 to 40 wt.%, preferably 15 to 35 wt.%,

[0062] iii. 2 wt.% to 75 wt.%, preferably 5 to 75 wt.%, particularly preferably 10 to 75 wt.%, in particular 10 to 70 wt.% mixture, in particular premixture, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and an inorganic filler whose surface has hydrocarbon groups, as well as

[0063] iv. 0 to 15 wt.% at least one additive(s), pigment(s) and / or dye(s), in particular 0.5 to 10 wt.%, and

[0064] v. 0 to 3 wt.%, in particular 0.001 to 0.5 wt.%, comprising a hydrosilylation catalyst, and the

[0065] vi. 0 to 10 wt.% opacifying agent, in particular titanium dioxide, in particular 0.5 to 10 wt.%, preferably 1 to 7 wt.%,

[0066] vii. 0.5 to 30 wt.%, in particular 1 to 20 wt.%, preferably 5 to 20 wt.%, particularly preferably 5 to 15 wt.%, polysiloxanes containing at least two Si-H groups, in particular wherein the composition as a total composition is 100 wt.%,

[0067] Preferably, the composition comprises, as a whole, a filler component whose surface has at least partially covalently bonded hydrocarbon groups, comprising 6 to 20 wt.% of the mixture, in particular 10 to 75 wt.%, in relation to the total composition of 100 wt.%. Furthermore, it is preferred that the composition, in particular the 2K composition, comprises 7 to 35 wt.% polysiloxanes, preferably 15 to 35 wt.%. KDP12312WO 17 March 2026

[0068] Polysiloxanes ie), from the iii.) mixture, in particular premix, in the overall composition of 100 wt.%.

[0069] The invention also relates to a curable or cured 2K composition comprising

[0070] i. 15 to 60 wt.%, in particular 20 to 55 wt.%, preferably 20 to 45 wt.%, addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups,

[0071] ii. 5 to 45 wt.% filler comprising cristobalite, preferably 20 to 35 wt.%, iii. 2 to 75 wt.%, in particular 10 to 60 wt.%, preferably 12 to 55 wt.% mixture, in particular premix, comprising addition-curing linear polysiloxanes containing at least two terminal ethylene groups, in particular comprising polysiloxanes ie), and inorganic filler whose surface has hydrocarbon groups, as well as

[0072] iv. 0 to 15 wt.% at least one additive(s), pigment(s) and / or dye(s), in particular 0.5 to 10 wt.%, and

[0073] v. 0 to 3 wt.%, in particular 0.001 to 0.5 wt.%, comprising a hydrosilylation catalyst, and the

[0074] vi. 0 to 10 wt.% opacifying agent, in particular titanium dioxide, in particular 0.5 to 10 wt.%, preferably 1 to 7 wt.%,

[0075] vii. 0.5 to 30 wt.%, in particular 1 to 20 wt.%, preferably 5 to 20 wt.%, particularly preferably 5 to 15 wt.%, polysiloxanes containing at least two Si-H groups, in particular wherein the composition as a total composition is 100 wt.%, preferably the composition as a total composition comprises a filler fraction, the surface of which has at least partially covalently bonded hydrocarbon groups, of 6 to 20 wt.% from the iii. mixture, in particular 8 to 20 wt.%, with respect to the total composition of 100 wt.%.

[0076] As a mixture, in particular a premix, iii. a compound is preferably used, wherein this is a premix. With this premix, the handling properties and / or the mechanical properties of the mixed and polymerized composition can be optimally adjusted. The fillers in the mixture or compound preferably comprise metal oxides and / or semimetal oxides or mixtures thereof, preferably the filler comprises silicon dioxide, particularly preferably fumed silica or cristobalite, most preferably fumed silica, and in particular preferably hydrophobized fumed silica. Furthermore, it is preferred, KDP12312WO 17 March 2026

[0077] if the pyrogenic silica is present in a particulate form, in particular in a low or non-aggregated state, and the surfaces are silanized, for example, with silanetrimethyl groups and / or silanedimethylvinyl groups or a mixture thereof, iii., in particular premixture, preferably comprises, in particular comprising, polysiloxanes ie) and optionally ia), ib), ic), id) and / or if), wherein ia) to if) may each be selected independently and as a mixture thereof.

[0078] The iii. mixture, in particular premixture, preferably comprises 15 to 80 wt.%, preferably 50 to 80 wt.% polysiloxanes with terminal ethylene groups having an ethylene group content of 0.01 to 0.1 mmol / g, preferably 0.04 to 0.08 mmol / g with plus / minus 0.005 mmol / g, and 20 to 85 wt.% filler, in particular filler whose surface has at least partially covalently bonded hydrocarbon groups, in particular 20 to 65 wt.% filler, particularly preferably 20 to 50 wt.% inorganic filler whose surface has at least partially covalently bonded hydrocarbon groups, wherein the iii. mixture as a total mixture has 100 wt.%.

[0079] Alternatively preferably, the mixture, in particular premixture, may contain iii) the content of addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups of 50 to 80 wt.%, in particular 60 to 80 wt.%, in particular comprising polysiloxanes ie) or comprising one or more of the polysiloxanes ia), ib), ic), id), ie) and / or if) or a mixture comprising at least two of the aforementioned polysiloxanes, and the proportion of filler in the mixture may be 20 to 50 wt.%, in particular 20 to 40 wt.%, wherein this mixture, in particular premixture, as a total mixture comprises 100 wt.% (iii).

[0080] The inorganic filler ii. preferably comprises particulate cristobalite, particularly with a particle size of 1 to 5 micrometers, especially preferably with an average particle size of 1 to 5 micrometers, and more preferably of 2 to 5 micrometers. Furthermore, it is preferred that the cristobalite is in particulate form and that the surfaces are provided with silanetrimethyl groups and / or silanedimethylvinyl groups and / or silaneoxyalkylene(meth)acrylate or a mixture thereof (alkylenes are alkanediyl groups).

[0081] It is preferred that in composition A and / or B, 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, particularly vinyl groups, especially in i) and / or iii). KDP12312WO 17 March 2026

[0082] According to another alternative, a composition is preferred in which the addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups are a mixture of linear polydialkylsiloxanes containing terminal ethylene groups, comprising or comprising linear polydialkylsiloxanes containing terminal ethylene groups.

[0083] - ia) optionally with a number-mean molecular weight of 2500 to 9950 Mn and a mass-mean molecular weight of 3000 to 14925 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, and / or

[0084] - ib) with a number-mean molecular weight of 10000 to 25000 Mn and a mass-mean molecular weight of 12000 to 37500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, and / or

[0085] - ic) linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 55000 to 75000 Mn and a mass-average molecular weight of 66000 to 112500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, and / or

[0086] - id) linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 40000 to 54500 Mn and / or a mass-average molecular weight of 48000 to 82500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, and / or

[0087] and / or optional

[0088] ie) linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 25500 to 39500 Mn and / or a mass-average molecular weight of 30000 to 60000 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, and / or optionally

[0089] - if) linear polydialkylsiloxanes containing terminal ethylene groups with a number-average molecular weight of 75000 to 100000 Mn and / or a mass-average molecular weight of 90000 to 150000 Mw, wherein the polydispersity (D) is from 1.2 to 1.5.

[0090] Preferably, a mixture of at least two of the aforementioned polysiloxanes comprising ia), ib), ic), id), ie) and / or if), preferably comprising ib) and ic) and optionally selected from ia), id) and / or ie), is preferred; particularly preferably comprising three of the aforementioned polysiloxanes comprising ib), ic), id) and / or ie), preferably comprising ib), ic), id) and optionally selected from ia), id) and ie). KDP12312WO 17 March 2026

[0091] Furthermore, it is preferred if the linear polydialkylsiloxanes containing terminal ethylene groups, in particular in i) and / or iii. mixture, in particular premix, comprise linear polysiloxanes containing terminal ethylene groups with a number-average molecular weight (number-average molecular weight)

[0092] ia) optionally containing terminal ethylene groups linear polydialkylsiloxanes with a number-average molecular weight of 2500 to 9950 Mn and a mass-average molecular weight of 3000 to 14925 Mw, wherein the polydispersity (D) is of 1.2 to 1.5, in particular 0.2 to 0.8 mmol / g, in particular 0.2 to 0.5 mmol / g, and / or

[0093] ib) Linear polydialkylsiloxanes containing terminal ethylene groups, having a number-average molecular weight of 10,000 to 25,000 Mn and a mass-average molecular weight of 12,000 to 37,500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular from 0.08 to 0.20 mmol / g, in particular from 0.1 to 0.15 mmol / g, preferably from 0.13 to 0.15 mmol / g,

[0094] ic) linear polydialkylsiloxanes containing terminal ethylene groups, having a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66,000 to 112,500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular having terminal ethylene groups of 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g, and / or

[0095] id) Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 40,000 to 54,500 Mn and / or a mass-average molecular weight of 48,000 to 82,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups, and / or

[0096] ie) Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 25,500 to 39,500 Mn and / or a mass-average molecular weight of 30,000 to 60,000 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.05 to 0.08 mmol / g of terminal ethylene groups, and / or optionally if) Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 75,000 to 100,000 Mn and / or a mass-average molecular weight of 90,000 to 150,000 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.02 to 0.03 mmol / g, in particular of 0.023 to 0.027 mmol / g terminal ethylene groups.

[0097] Furthermore, it may be preferred if the mixture of linear polydialkylsiloxanes containing terminal ethylene groups comprises a mixture of terminal ethylene KDP12312WO 17 March 2026

[0098] polydisiloxanes containing groups with optionally ia) 0.2 to 0.8 mmol / g, ib) 0.08 to 0.2 mmol / g, ic) 0.03 to 0.04 mmol / g, id) 0.02 to 0.08 mmol / g, ie) 0.05 to 0.08 mmol / g and / or if) with 0.2 to 0.03 mmol / g or mixtures comprising at least two of these polysiloxanes comprising terminal ethylene groups, wherein it is further preferred if i) includes ib), ic) and / or id), and if iii. The mixture, in particular the premix, comprises ie), and optionally, if the weight ratio in the composition comprises i) ia) from 0 to 5 wt.%, ib) from 5 to 30 wt.%, preferably from 8 to 25 wt.%, ic) from 1 to 30 wt.%, preferably from 5 to 25 wt.%, id) from 1 to 20 wt.%, preferably from 5 to 15 wt.%, ie) from 5 to 30 wt.%, in particular from 10 to 30 wt.% and / or if) from 0 to 10 wt.% in relation to the total composition of 100 wt.% of the composition and / or the iii. mixture comprises i) ia) from 0 to 5 wt.%, ib) from 0 to 30 wt.%.-%, preferably from 8 to 25 wt.%, ic) from 0 to 30 wt.%, preferably from 5 to 25 wt.%, id) from 0 to 20 wt.%, preferably from 5 to 15 wt.%, ie) from 5 to 30 wt.%, in particular from 10 to 30 wt.% and / or if) from 0 to 10 wt.% in relation to the total mixture of 100 wt.% in relation to the iii. mixture, in particular premix.

[0099] In an alternative, it is further preferred if a composition A and / or a composition B each independently comprise ib), ic) and id) and optionally selected from ia), ie) and if) and iii. a mixture, in particular a premix, comprising ie) and optionally selected from ia), ib), ic), id) and if).

[0100] Furthermore, the desired properties can be obtained if the proportion of polysiloxanes with a high content of terminal ethylene groups is low compared to the polysiloxanes with a low content of these groups; surprisingly, the lower the proportion, the higher the toughness. Therefore, it is preferred that the proportion of polysiloxanes with a terminal ethylene group content of 0.08 to 0.2 mmol / g is low compared to polysiloxanes with a terminal ethylene group content of 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g, as this increases the tensile strength and / or the toughness (tensile strength).

[0101] A preferred ratio in the mixture of a) polydisiloxanes containing terminal ethylene groups with 0.08 to 0.2 mmol / g to the sum of 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g and 0.02 to 0.08 mmol / g terminal ethylene groups, is 0 to 20 to 1 to 20 by weight, particularly 1 to 5 to 1 to 20, preferably 0 to 5 to 1 to 20. Alternatively, a preferred ratio in the mixture of b) is 0.08 to 0.2 mmol / g terminal ethylene groups to the sum of 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g and 0.02 to 0.08 mmol / g. KDP12312WO containing terminal ethylene groups, March 17, 2026

[0102] Polydisiloxanes in a weight ratio of 0.75 : 5 to 1 to 20, preferably, particularly preferably, of 0.75 : 6 to 1 to 15, particularly preferably of 1 to 10.

[0103] A preferred ratio in the 2K composition in i. of ic) to ib) is from 1 : 0.1 to 1 : 3 and / or of ic) to id) from 2 : 1 to 1 :2, preferably from 1 : 1 with + / - 25%.

[0104] According to an alternative embodiment, a preferred composition comprises: addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of 20 to 80 wt.%, in particular 20 to 70 wt.%, linear polydialkylsiloxanes containing terminal ethylene groups, optionally ia) having a number-average molecular weight of 2500 to 9950 Mn and a mass-average molecular weight of 3000 to 14925 Mw, wherein the polydispersity (D) is of 1.2 to 1.5, in particular 0.2 to 0.8 mmol / g, in particular 0.2 to 0.5 mmol / g, and / or i.b) Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 10,000 to 25,000 Mn and a mass-average molecular weight of 12,000 to 37,500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular from 0.08 to 0.20 mmol / g, in particular from 0.1 to 0.15 mmol / g, and / or ic) Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66,000 to 112,500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular from 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g terminal ethylene groups, and / or i.d) Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 40,000 to 54,500 Mn and / or a mass-average molecular weight of 48,000 to 82,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, especially 0.04 to 0.05 mmol / g of terminal ethylene groups, and / or ie) Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 25,500 to 39,500 Mn and / or a mass-average molecular weight of 30,000 to 60,000 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.05 to 0.08 mmol / g terminal ethylene groups, and / or i.f) Optionally containing linear polydialkylsiloxanes with terminal ethylene groups, having a number-average molecular weight of 75,000 to 100,000 Mn and / or a mass-average molecular weight of 90,000 to 150,000 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular from 0.02 to 0.03 mmol / g, in particular from 0.023 to 0.027 mmol / g of terminal ethylene groups, in particular with respect to the total composition of 100 wt.% of the composition, in particular composition A and / or B. KDP12312WO 17 March 2026.

[0105] A mixture of the aforementioned polydisiloxanes is particularly preferred, preferably polysiloxanes ib, ic), id) and optionally selected from ia), ie) and if), wherein the content in weight percent refers to a total composition of 100 wt.% of the composition, in particular as a mixture of A and B, or of compositions A or composition B.

[0106] According to another alternative embodiment, it is preferred if a composition A comprises

[0107] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of,

[0108] - Linear polydialkylsiloxanes containing 0.1 to 45 wt.%, in particular 0.1 to 35 wt.%, preferably 0.5 to 15 wt.%, terminal ethylene groups, with a number-average molecular weight of 10,000 to 25,000 Mn and a mass-average molecular weight of 12,000 to 37,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.08 to 0.20 mmol / g, in particular 0.1 to 0.15 mmol / g terminal ethylene groups, and / or

[0109] - Linear polydialkylsiloxanes containing 5 to 35 wt.%, in particular 5 to 15 wt.%, terminal ethylene groups, with a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66,000 to 112,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with terminal ethylene groups of 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g, and / or

[0110] - Linear polydialkylsiloxanes containing 1 to 20 wt.%, in particular 5 to 15 wt.%, terminal ethylene groups, with a number-average molecular weight of 40,000 to 54,500 Mn and / or a mass-average molecular weight of 48,000 to 82,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups, in relation to a total composition of 100 wt.% of composition A, and / or

[0111] a composition B comprising

[0112] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of

[0113] - Linear polydialkylsiloxanes containing terminal ethylene groups, in particular 0 to 5 wt%, alternatively preferably up to 20 wt%, with a number-average molecular weight of 10,000 to 25,000 Mn and a mass-average molecular weight of 12,000 to 37,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.08 to 0.20 mmol / g, in particular 0.1 to 0.15 mmol / g of terminal ethylene groups, KDP12312WO 17 March 2026

[0114] - Linear polydialkylsiloxanes containing 5 to 35 wt.%, in particular 5 to 15 wt.%, terminal ethylene groups, with a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66,000 to 112,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with a terminal ethylene group of 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g, and / or optionally - linear polydialkylsiloxanes containing 0 to 20 wt.%, in particular 1 to 20 wt.%, in particular 5 to 15 wt.%, terminal ethylene groups, with a number-average molecular weight of 40,000 to 54,500 Mn and / or a mass-average molecular weight of 66,000 to 112,500 Mw Molecular weight of 48000 to 82500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups, in relation to a total composition of 100 wt.% of composition B.

[0115] Likewise, in an alternative embodiment, it may be preferred if the composition comprises as

[0116] Composition A, which includes

[0117] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of

[0118] - Linear polydialkylsiloxanes containing 0.1 to 10 wt% terminal ethylene groups, with a number-average molecular weight of 10000 to 25000 Mn and a mass-average molecular weight of 12000 to 37500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.08 to 0.20 mmol / g, in particular 0.1 to 0.15 mmol / g terminal ethylene groups,

[0119] - Linear polydialkylsiloxanes containing 5 to 35 wt.%, in particular 5 to 15 wt.%, terminal ethylene groups, with a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66,000 to 112,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g of terminal ethylene groups, and / or - Linear polydialkylsiloxanes containing 1 to 20 wt.%, in particular 5 to 15 wt.%, terminal ethylene groups, with a number-average molecular weight of 40,000 to 54,500 Mn and / or a mass-average molecular weight of 48,000 up to 82500 MW, wherein the polydispersity (D) is from 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups

[0120] with regard to a total composition of 100 wt.% of composition A and / or

[0121] the composition B includes

[0122] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of KDP12312WO 17 March 2026

[0123] - Linear polydialkylsiloxanes containing 0 to 20 wt.%, in particular 0.1 to 5 wt.%, terminal ethylene groups, with a number-average molecular weight of 10000 to 25000 Mn and a mass-average molecular weight of 12000 to 37500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.08 to 0.20 mmol / g, in particular 0.1 to 0.15 mmol / g of terminal ethylene groups,

[0124] - Linear polydialkylsiloxanes containing 5 to 35 wt.%, in particular 5 to 15 wt.%, terminal ethylene groups, with a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66,000 to 112,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with terminal ethylene groups of 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g, and / or - Linear polydialkylsiloxanes containing 1 to 20 wt.%, in particular 5 to 15 wt.%, terminal ethylene groups, with a number-average molecular weight of 40,000 to 54,500 Mn and / or a mass-average molecular weight of 48,000 to 82500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups,

[0125] with regard to a total composition of 100 wt.% of composition B.

[0126] Preferably, in an alternative, the proportion of linear polydialkylsiloxanes containing terminal ethylene groups with a number-average molecular weight of 10000 to 25000 Mn and a mass-average molecular weight of 12000 to 37500 Mw is, wherein the polydispersity (D) is from 1.2 to 1.5, in particular with 0.08 to 0.20 mmol / g, in particular 0.1 to 0.15 mmol / g terminal ethylene groups of 0.01 to 5 wt.% in composition B (base), wherein the proportion of the iii. mixture, in particular of 30 to 65 wt.%, in composition A (catalyst) with a total composition of 100 wt.% is preferably particularly high.

[0127] Another alternative might be preferable if

[0128] the composition A includes

[0129] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of

[0130] - Linear polydialkylsiloxanes containing 1 to 15 wt.%, in particular 2 to 15 wt.%, terminal ethylene groups, with a number-average molecular weight of 10000 to 25000 Mn and a mass-average molecular weight of 12000 to 37500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.08 to 0.20 mmol / g, in particular 0.1 to 0.15 mmol / g terminal ethylene groups, KDP12312WO 17 March 2026

[0131] - Linear polydialkylsiloxanes containing 5 to 15 wt% terminal ethylene groups, with a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66,000 to 112,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with terminal ethylene groups of 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g, and

[0132] - Linear polydialkylsiloxanes containing 5 to 15 wt% terminal ethylene groups, with a number-average molecular weight of 40,000 to 54,500 Mn and / or a mass-average molecular weight of 48,000 to 82,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups,

[0133] with regard to a total composition of 100 wt.% of composition A, and / or

[0134] the composition B includes

[0135] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of

[0136] - Linear polydialkylsiloxanes containing 0 to 20 wt.%, in particular 0 to 10 wt.%, particularly preferably 0 to 3 wt.%, preferably 0 to 1 wt.%, containing terminal ethylene groups, with a number-average molecular weight of 10000 to 25000 Mn and a mass-average molecular weight of 12000 to 37500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.08 to 0.20 mmol / g, in particular 0.1 to 0.15 mmol / g of terminal ethylene groups,

[0137] - Linear polydialkylsiloxanes containing 5 to 15 wt% terminal ethylene groups, with a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66,000 to 112,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with terminal ethylene groups of 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g, and

[0138] - Linear polydialkylsiloxanes containing 1 to 15 wt% terminal ethylene groups, with a number-average molecular weight of 40,000 to 54,500 Mn and / or a mass-average molecular weight of 48,000 to 82,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups,

[0139] with regard to a total composition of 100 wt.% of composition B.

[0140] Furthermore, it is preferred if, in addition to the aforementioned compositions and the specified levels of i., the level of iii. of the mixture, in particular KDP12312WO 17 March 2026, is also specified.

[0141] The premix or compound is present in a higher proportion in composition A than in composition B. Preferably, the content of iii. of the mixture, particularly the premix, in composition A and / or B is 15 to 65 wt.%. Particularly preferred is a content of iii. of the mixture in composition B of 15 to 30 wt.% and in composition A of 20 to 65 wt.%, preferably 30 to 65 wt.% in composition A, the content always referring to 100 wt.% of the respective composition A or B. Furthermore, it is preferred that the weight ratio of iii. of the mixture in composition A to iii. of the mixture, particularly the premix, in composition B is 1:1 to 1:2.5, preferably 1:1.5 to 1:2. Particularly high values ​​for tensile strength or toughness are achieved for a ratio of 1:1.5 to 1:2.5.

[0142] Component v. is preferably a polysiloxane containing Si-H groups with a Si-H group content of 0.5 to 8.0 mmol / g, particularly 1.3 to 7.0 mmol / g, preferably with a Si-H group content of 1 to 6 mmol / g, more preferably with 1.2 to 6 mmol / g, alternatively preferably with a Si-H group content of 1.1 to 2.5 mmol / g. Polysiloxanes containing Si-H groups with a content of 1.4 ± 0.5 mmol / g are particularly preferred.

[0143] According to a further preferred alternative, it is preferred if the composition comprises, as ii. an inorganic filler in composition A and / or B, a hydrophobized cristobalite, in particular if the surface of the cristobalite has a partial to complete covering with alkyl groups. This means that virtually no hydroxyl groups are present on the surface. It is particularly preferred that the cristobalite is present in particulate form; in the starting material, it is preferably in powder form. Furthermore, it is preferred that the cristobalite has a particle size of less than or equal to 100 micrometers, preferably less than 10 micrometers. It is also preferred that, at the same time, D0 is up to 1 micrometer, D0 is up to 2.5 micrometers, and D90 is up to 6 micrometers. The particle size can be determined by volume averaging using a Mastersizer 2000.The particle size of the cristobalite is most preferably 3.5 micrometers, particularly a mean particle size of 2.5 micrometers. It is further preferred that 90 wt.% of the cristobalite has a particle size distribution of 1 micrometer to 10 micrometers, particularly that 90 wt.% has a particle size below 10 micrometers. It is also preferred that the cristobalite is hydrophobized with silane trimethyl and / or silane dimethyl vinyl, preferably with silane trimethyl. The cristobalite used is free of iron impurities. KDP12312WO March 17, 2026.

[0144] According to a further alternative, it is preferred if the composition, composition A and / or composition B as iii. mixture, in particular premix, comprises a mixture containing at least two linear polysiloxanes containing terminal ethylene groups, in particular polydialkylsiloxanes with alkyl of 1 to 4 C atoms, comprising at least two polydimethylsiloxanes having terminal vinyl groups, preferably these polysiloxanes having 0.02 to 0.10 mmol / g of terminal ethylene groups, in particular 0.02 to 0.08 mmol / g, preferably around 0.05 mmol / g with plus / minus 5%. It is further preferred that the linear polydialkylsiloxanes containing terminal ethylene groups have a number-average molecular weight of 25500 to 3950 Mn and / or a mass-average molecular weight of 30000 to 60000 Mw, in particular wherein the polydispersity (D) is from 1.2 to 1.5 and optionally comprising polysiloxanes selected from ia), ib), ic), i.e) and / or if), where optionally at least two of the polysiloxanes from ia), ib), ic), ie) and / or if) are selected.

[0145] Alternatively, the iii. mixture, in particular the premix, may comprise polysiloxanes having at least two terminal vinyl groups, including polysiloxanes comprising ib) or ic) or id). In a further alternative, the iii. mixture, in particular the premix, may comprise polysiloxanes having at least two terminal vinyl groups, including id) and ia), or id) and ib), or id) and ic), or id) and ie), or id) and if), or mixtures comprising at least two of the polysiloxanes selected from ia), ib), ic), id), ie), and / or if). In a further alternative, the iii. mixture, in particular the premix, may comprise two, three, or a plurality of the aforementioned polysiloxanes. In a further alternative, the iii. mixture, in particular the premix, may comprise polysiloxanes having at least two terminal vinyl groups, including polysiloxanes comprising ia) or ib) or ic) or id) or ie) or if).

[0146] Alternatively, the composition may, in particular, comprise composition A and / or B, preferably as a 2K composition,

[0147] a composition A, which includes

[0148] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of linear polydialkylsiloxanes containing 20 to 60 wt.% terminal ethylene groups, in particular comprising ib) and / or ic) and / or id) and optionally ia), ie) and / or if), and

[0149] iii. 2 to 70 wt.%, in particular 5 to 40 wt.%, particularly preferably 10 to 45 wt.% ie) linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 25500 to 39500 Mn and / or a mass-average KDP12312WO 17 March 2026

[0150] Molecular weight of 30000 to 60000 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular with 0.05 to 0.08 mmol / g terminal ethylene groups,

[0151] from the mixture, in particular premix, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and an inorganic filler whose surface has hydrocarbon groups,

[0152] with regard to a total composition of 100 wt% of composition A, and a composition B comprising

[0153] i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of 20 to 45 wt.%, in particular 20 to 35 wt.%, linear polydialkylsiloxanes containing terminal ethylene groups, in particular comprising ib) and / or ic) and / or id) and optionally ia), ie) and / or if),

[0154] iii. 2 to 70 wt.%, in particular 5 to 40 wt.%, particularly preferably 10 to 30 wt.% ie) linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 25500 to 39500 Mn and / or a mass-average molecular weight of 30000 to 60000 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.05 to 0.08 mmol / g terminal ethylene groups, from the mixture, in particular premixture, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and an inorganic filler, the surface area of ​​which is related to a total composition of 100 wt.% of composition B.

[0155] It is further preferred that the iii. mixture, in particular the premix or the compound, comprises 60 to 80 wt.%, in particular 65 to 75 wt.%, addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and 20 to 40 wt.%, in particular 25 to 35 wt.%, inorganic fillers whose surface has hydrocarbon groups, wherein the total composition of the iii. mixture is 100 wt.%. Preferably, the surface of the inorganic filler in the iii. mixture has hydrocarbon groups originating from silandialkylalkyl groups with alkyl of 1 to 8 carbon atoms and vinyl groups.

[0156] According to a further particularly preferred embodiment, a composition comprising composition A and B or the 2K composition, in particular as separate composition A and composition B, can include

[0157] A composition A comprises i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of 0.1 to 25 wt.%, in particular 0.1 to 10 wt.%, containing terminal ethylene groups, comprising ib) and optionally ic) and / or id) and / or optionally ia), KDP12312WO 17 March 2026

[0158] ie) and / or if), with respect to an overall composition of 100 wt.% of composition A, and

[0159] A composition B comprises i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of 0 to 20 wt.%, in particular 0 to 9 wt.%, linear polydialkylsiloxanes containing terminal ethylene groups comprising ib) and optionally ic) and / or id) and / or optionally ia), ie) and / or if), in relation to a total composition of 100 wt.% of composition B.

[0160] Preferably, metal oxides, semimetal oxides, or mixtures thereof are used as fillers; silicon dioxide, especially silicic acid, is particularly preferred, particularly pyrogenic silicic acid, especially a filler whose surface has been hydrophobized with silanetrimethyl and / or silandimethylvinyl groups and / or mixtures thereof. It is especially preferred if the surface of the pyrogenic silicic acid is essentially free of hydroxyl groups, such as Si-OH. The inorganic filler particularly preferably comprises aggregates of agglomerates of pyrogenic silicic acid hydrophobized with silanetrimethyl and / or silandialkyl groups, especially with silandimethylvinyl groups. The aggregates are approximately 1 to 250 micrometers in size and can decompose into aggregates under shear stress. The particle size of the aggregates can be analyzed using scanning electron microscopy (SEM).The surface area of ​​the pyrogenic silica is preferably greater than or equal to 90% of the surface area, particularly the outer surface area. It is especially preferred that it be almost 100% hydrophobic. The surface area of ​​the fillers is preferably between 120 and 190 m². 2 / g. Corresponding hydrophobized pyrogenic silicas are commercially available. In particular, the hydrophobized silica in one alternative of the iii mixture or compound exhibits a maximum of approximately 2 silanol groups per nm. 2 , particularly on the outer surface, more preferably about one silanol group per 1 nm 2 , preferably about 0.5 silanol groups per 1 nm 2 Determining the number of silanol groups per nm 2 This is done using IR spectroscopy, absorption of hydroxy groups. Alternatively, the surface area can be determined using the BET method known to those skilled in the art and / or the carbon content of the fillers can be determined by CHN analysis.

[0161] Also part of the invention is a composition comprising composition A and / or B, each independently comprising at least one opacifying agent, in particular a barium salt and / or titanium dioxide, in particular 0.5 to 7.5 wt.% titanium dioxide, preferably crystalline titanium dioxide, particularly preferably anatase. GanzKDP12312WO March 17, 2026

[0162] Particularly preferred is crystalline, hydrophilic titanium dioxide. Suitable barium salts include barium sulfate and / or barium phosphate.

[0163] Furthermore, the composition and / or composition B comprises, preferably, 10 to 20 wt.% polysiloxanes containing at least two Si-H groups, wherein the Si-H group content is preferably from 0.5 to 10 mmol / g, more preferably from 0.01 to 8 mmol / g, particularly preferably from 1 to 6 mmol / g, and more preferably from 1 to 2.5 mmol / g. Mn can preferably be from 200 to 4000 and Mw from 240 to 6000, wherein the polydispersity is preferably from 1.2 to 1.5.

[0164] According to a further alternative, a composition is preferred which comprises a. composition A comprising addition-crosslinkable organofunctional polysiloxanes, wherein composition A comprises

[0165] i. Linear polysiloxanes containing at least two terminal ethylene groups and adding 15 to 60 wt% crosslinking by weight,

[0166] ii. 5 to 45 wt.% filler comprising cristobalite, in particular 15 to 35 wt.%, preferably 20 to 35 wt.%,

[0167] iii. 2 to 70 wt.%, in particular 5 to 70 wt.%, particularly preferably 10 to 70 wt.% mixture, in particular premix, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and an inorganic filler whose surface has hydrocarbon groups, and iv. 0 to 15 wt.% additive(s), pigment(s) and / or dye(s), in particular 0.01 to 10 wt.%, and

[0168] v. 0 to 3 wt.%, in particular 0.001 to 0.5 wt.%, comprising a hydrosilylation catalyst, and the

[0169] vi. 0 to 10 wt.% opacifying agent, in particular titanium dioxide,

[0170] wherein the total composition A comprises 100 wt.%, and

[0171] b. the composition B comprises

[0172] i. 10 to 50 wt.%, in particular 10 to 45 wt.% addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups,

[0173] ii. 5 to 45 wt.% filler comprising cristobalite, in particular 15 to 35 wt.%, preferably 20 to 35 wt.%,

[0174] iii. 2 to 70 wt.%, in particular 5 to 70 wt.%, particularly preferably 10 to 70 wt.% mixture, in particular premix, comprising addition-curing linear polysiloxanes containing at least two terminal ethylene groups and an inorganic filler, the surface of which has at least hydrocarbon groups, as well as KDP12312WO 17 March 2026

[0175] iv. 0 to 15 wt.% additives, pigment(s) and / or dye(s), in particular from 0.01 to 10 wt.%,

[0176] v. 0.5 to 30 wt.%, in particular 2 to 30 wt.%, polysiloxanes containing at least two Si-H groups and

[0177] vi. 0 to 10 wt.% opacifying agent, in particular titanium dioxide,

[0178] where the total composition B comprises 100 wt.%.

[0179] Particularly preferred is a composition comprising a curable or cured mixture of compositions A and / or B in a ratio of 1 to 1 to 1 to 5 to 5 to 1.

[0180] Particularly preferred are 2K compositions, composition A and composition B, each independently comprising mixture, in particular premix, iii. with 2 to 70 wt.%, in particular 5 to 65 wt.%, particularly preferably 10 to 65 wt.%, preferably 15 to 55 wt.% in relation to 100 wt.% of the respective applicable composition, comprising 2K composition, composition A and / or B, wherein the iii mixture preferably comprises ie) and optionally ia) to if) or mixtures thereof.

[0181] The compositions preferably comprise 0.01 to 10 wt.%, preferably 0.1 to 5 wt.% at least one additive(s), pigment(s) and / or dye(s) in a total composition B and / or A of 100 wt.% or a composition of 100 wt.%, preferably a mixed and optionally curable or cured composition of 100 wt.% in the total composition.

[0182] Furthermore, a composition comprising is preferred.

[0183] in particular a mixture of a. composition A and b. composition B,

[0184] comprehensive

[0185] Linear polysiloxanes containing at least two terminal ethylene groups and exhibiting addition crosslinking properties of 15 to 60 wt%,

[0186] A filler comprising 5 to 45 wt.% cristobalite, in particular 5 to 35 wt.%, and a mixture, in particular a premix, comprising addition-curing linear polysiloxanes containing at least two terminal ethylene groups and an inorganic filler whose surface has hydrocarbon groups, preferably the content of addition-curing linear polysiloxanes containing at least two terminal ethylene groups is 50 to 80 wt.%, KDP12312WO 17 March 2026

[0187] in particular of 60 to 80 wt.% and the proportion of filler in the mixture of 20 to 50 wt.%, in particular of 20 to 40 wt.%, wherein this mixture as a total mixture has 100 wt.%, as well as

[0188] 0 to 15 wt.% additives and / or colorants, and

[0189] 0 to 3 wt.%, in particular 0.01 to 0.5 wt.%, comprising a hydrosilylation catalyst, and the

[0190] 0 to 10 wt.% opacifying agent, in particular titanium dioxide,

[0191] 4 to 30 wt.%, in particular 5 to 20 wt.%, preferably 5 to 15 wt.%, polysiloxanes containing at least two Si-H groups, in particular wherein the composition as a total composition is 100 wt.%.

[0192] According to another alternative, a composition comprising a. a composition A, is preferred.

[0193] This includes addition-crosslinkable organofunctional polysiloxanes comprehensively

[0194] i. 15 to 60 wt.%, in particular 15 to 35, or 15 to 25 wt.%, addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of

[0195] - Linear polydialkylsiloxanes containing 1 to 15 wt% terminal ethylene groups, with a number-average molecular weight of 10,000 to 25,000 Mn and a mass-average molecular weight of 12,000 to 37,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.08 to 0.20 mmol / g, in particular with 0.1 to 0.15 mmol / g terminal ethylene groups; linear polydialkylsiloxanes containing 5 to 15 wt% terminal ethylene groups, with a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66,000 to 112,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g of terminal ethylene groups, and / or 5 to 15 wt.Linear polydialkylsiloxanes containing -% terminal ethylene groups, with a number-average molecular weight of 40000 to 54500 Mn and / or a mass-average molecular weight of 48000 to 82500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups, based on the total composition of 100 wt.% of composition A.

[0196] ii. 5 to 45 wt.% filler comprising cristobalite, in particular 10 to 35 wt.%, iii. 10 to 70 wt.% mixture, in particular premix, comprising addition-curing linear KDP12312WO containing at least two terminal ethylene groups 17 March 2026

[0197] Polysiloxanes and inorganic filler whose surface has hydrocarbon groups, as well as

[0198] iv. 0 to 15 wt.% additive(s), pigment(s) and / or dye(s), and

[0199] comprising 0 to 3 wt.% a hydrosilylation catalyst, and the

[0200] vi. 0 to 10 wt.% opacifying agent, in particular titanium dioxide, wherein the total composition A comprises 100 wt.%,

[0201] and the

[0202] b. Composition B comprises

[0203] i. 10 to 40 wt.% addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of

[0204] - Linear polydialkylsiloxanes containing terminal ethylene groups, preferably 0.01 to 5 wt.% or 0 to 3 wt.%, preferably 0 to 1 wt.%, alternatively 0.1 to 1 wt.%, containing terminal ethylene groups, with a number-average molecular weight of 10,000 to 25,000 Mn and a mass-average molecular weight of 12,000 to 37,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, particularly with 0.08 to 0.20 mmol / g, particularly 0.1 to 0.15 mmol / g, containing terminal ethylene groups, and / or linear polydialkylsiloxanes containing terminal ethylene groups, preferably 8 to 15 wt.%, containing terminal ethylene groups, with a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66000 to 112500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular with terminal ethylene groups of 0.018 to 0.055 mmol / g, preferably from 0.03 to 0.04 mmol / g, and / or 1 to 15 wt.Linear polydialkylsiloxanes containing -% terminal ethylene groups, with a number-average molecular weight of 40000 to 54500 Mn and / or a mass-average molecular weight of 48000 to 82500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups, based on the total composition of 100 wt.% of composition B.

[0205] ii. 5 to 45 wt.% filler comprising cristobalite, in particular 10 to 35 wt.%, iii. 10 to 70 wt.%, in particular 10 to 30 wt.%, mixture, in particular premix, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and inorganic filler, the surface of which has at least hydrocarbon groups, as well as

[0206] iv. 0 to 15 wt% additive(s), pigment(s) and / or dye(s).

[0207] v. 4 to 30 wt.%, in particular 5 to 20 wt.%, preferably 5 to

[0208] 15 wt% polysiloxanes containing at least two Si-H groups and KDP12312WO 17 March 2026

[0209] vi. 0 to 10 wt.% opacifying agent, in particular titanium dioxide, wherein the total composition B comprises 100 wt.%.

[0210] Composition, preferably a curable composition, in particular a dental composition, comprising

[0211] - Linear polydialkylsiloxanes containing 1 to 30 wt.%, in particular 0.5 to 20 wt.%, terminal ethylene groups, with a number-average molecular weight of 10000 to 25000 Mn and a mass-average molecular weight of 12000 to 37500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.08 to 0.20 mmol / g, in particular 0.1 to 0.15 mmol / g terminal ethylene groups, and / or

[0212] - Linear polydialkylsiloxanes containing 5 to 35 wt.%, in particular 5 to 15 wt.%, terminal ethylene groups, with a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66,000 to 112,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with terminal ethylene groups of 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g, and / or

[0213] - Linear polydialkylsiloxanes containing 0 to 20 wt.%, in particular 0.001 to 5 wt.%, terminal ethylene groups, with a number-average molecular weight of 40000 to 54500 Mn and / or a mass-average molecular weight of 48000 to 82500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups, wherein the content of these addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups is 15 to 60 wt.%,

[0214] - 5 to 45 wt.% filler comprising cristobalite, in particular 15 to 35 wt.%, preferably 20 to 35 wt.%,

[0215] - 2 to 75 wt.%, in particular 10 to 70 wt.% mixture, in particular premix, iii. comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and inorganic filler, the surface of which has hydrocarbon groups, as well as

[0216] - 0 to 15 wt% at least one additive(s), pigment(s) and / or dye(s), and

[0217] - 0 to 3 wt.%, in particular 0.001 to 0.5 wt.% comprising a hydrosilylation catalyst, and

[0218] - 0 to 10 wt% opacifying agent, in particular titanium dioxide,

[0219] - Polysiloxanes containing 2 to 30 wt% at least two Si-H groups, in particular wherein the composition as a total composition is 100 wt%, KDP12312WO 17 March 2026

[0220] in particular as a mixture of a. composition A and b. composition B, advantageously in a mass ratio of 5:1 to 1:5, preferably 1:1 with optional + / - 25%.

[0221] Particularly preferably, the molar ratio in the composition comprising composition A and B of SiH / Vinyl is 2 to 10, preferably 2.5 to 7, most preferably 2.5 to 5.0.

[0222] Also related to the invention is a polymerized composition obtainable by mixing composition A and composition B, wherein composition A and composition B are mixed in a weight ratio of 5:1 to 1:5, in particular 2:1 to 1:2, and most preferably 1:1, particularly with a ratio of + / - 15%, wherein the polymerized composition preferably has a Shore A hardness (10 min) of 30 to 50 or greater and / or a tensile strength of 2 N / mm² or greater. 2), especially greater than or equal to 3 (N / mm²) 2 ), particularly preferably greater than or equal to 3.5 (N / mm²) 2 ), especially preferably greater than or equal to 4 (N / mm²) 2 ), and / or in particular with a tensile energy greater than or equal to 300 (Nmm), preferably greater than or equal to 500, particularly preferably greater than or equal to 600, or greater than or equal to 700 or greater than or equal to 800, and / or a tensile strength (N / mm²) 2 ) of greater than or equal to 3.0, preferably greater than or equal to 3.5, in particular greater than or equal to 6, especially preferably greater than or equal to 7, greater than or equal to 8, further preferably greater than or equal to 8.5.

[0223] 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 or SiH groups may also be called polyhydrogen siloxanes synonymously.

[0224] Preferred hydrosilylation catalysts include hydrosilylation catalysts containing platinum, rhodium and / or palladium.

[0225] The compositions according to the invention correspond to a type 3 or type 2 impression material; however, 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. KDP12312WO March 17, 2026

[0226] 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 carbon atoms, preferably alkyl with 1 to 4 carbon atoms, and particularly preferably methyl groups. According to an alternative, the addition-crosslinking polyethers may additionally comprise polyethers containing ethylene groups, in particular polyethers containing terminal ethylene groups, and preferably polyethers containing alkenyl groups.

[0227] According to a further particularly preferred alternative, the compositions, in particular composition A and / or B, each independently comprise: iv. Additives include surfactants, in particular surfactants and / or wetting agents. Preferably, an additive comprises at least one surfactant comprising a polyether, polyether-functionalized siloxane oligomer, fatty alcohol and / or fluorosurfactant, or mixtures of the aforementioned surfactants. Preferably, the composition is free of fluorosurfactants.

[0228] 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 oligomers 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 SiH and / or ethylene groups.

[0229] Surfactants are typically added to addition-curing impression materials to increase their hydrophilicity and thus facilitate flow onto moist surfaces. In addition to classic non-ionic surfactants, the following are also used in dental KDP12312WO 17 March 2026

[0230] Impression materials also contain partially fluorinated and / or perfluorinated surfactants, sometimes in combination with classic surfactants.

[0231] The surfactant content in the composition, particularly in composition A and / or B, especially in composition B, 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.%, particularly in the composition comprising A and B, wherein the total composition of the curable or polymerizable or polymerized composition is 100 wt.%. It is particularly preferred that the surfactant is contained only in composition B.

[0232] It is preferred that composition A and / or B each independently 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.

[0233] Preferred polysiloxanes comprise polydialkylsiloxanes with alkyl, each independently with 1 to 16 carbon atoms, in particular methyl groups.

[0234] According to a preferred alternative, composition B as the base component and composition A as the catalyst granule are mixed in a weight ratio of 10:1 to 1:10, particularly in a ratio of 5:1 to 1:5, preferably from 2:1 to 1:2. In particular, if different ratios are used, the preferred content of the components in the overall composition is to be taken into account.

[0235] According to a further alternative, the invention relates to a kit comprising a 2K dispensing device comprising at least one cartridge with at least two chambers or two cartridges, each with one chamber, wherein i) composition A is present in one of the chambers of the two-chamber cartridge or a chamber of a first single-chamber cartridge and ii) composition B is present in another chamber of the two-chamber cartridge or another single-chamber cartridge. The kit may further comprise at least one detachable and attachable static mixer. The dispensing device may preferably be a syringe or PLT, each having two separate containers or two separate volumes for receiving each of the compositions, in particular with an integrated or attachable static mixer. KDP12312WO March 17, 2026

[0236] Preferably, the 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.

[0237] 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, preferably a polyethylene oxide-alkylene-functionalized heptamethyltrisiloxane, particularly preferably 3-(2-methoxyethoxy)propyl-methyl-bis(trimethylsilyoxy)silane.

[0238] 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.

[0239] Suitable hydrosilylation catalysts containing platinum, rhodium, or palladium are understood to be catalysts or their precatalysts containing platinum, rhodium, or palladium 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 (H₂PtCl₂ and divinyl disiloxanes such as (CH₂=CH)Me₂Si-O-SiMe₂(CH=CH₂)). Karstedt catalysts may contain dinuclear platinum complexes. Equally preferred hydrosilylation catalysts include [1,3-bis(cyclohexyl)imidazol-2-ylidene][1 , 3-di vi ny I- 1 , 1 ,3,3-tetramethyldisiloxane]platin(0)(ICy)Pt(vs)];

[0240] [1,3-Bis(2,6-diisopropylphenyl)imidazol-2-ylidene][1,3-divi ny I-1,1,3,3,-tetramethyldisiloxane]-platinum(O), (IPr)Pt(vs).

[0241] Alternatively, the polydimethylsiloxanes can have 1 to 10 mol% of the methyl groups in the siloxane backbone replaced by alkyl groups with O2 to C16, in particular O2 to O8, and / or KDP12312WO 17 March 2026

[0242] Phenyl groups may be substituted. Alternatively, allyl-terminated polydialkylsiloxanes or allyl-terminated polyether-functional polydialkylsiloxanes can be used.

[0243] 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 3000 g / mol to 150000 g / mol, preferably the number average Mw is in the range of 10000 g / mol to 125000 g / mol, and / or the Si-H group-containing polydialkylsiloxanes are, alternatively, 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 240 g / mol to 6000 g / mol, particularly Mw 1560 and 3900 g / mol, and preferably the number average Mn in the range of 200 g / mol to 4000 g / mol, especially Mn 1300 to 2600 g / mol.The determination of Mw and Mn can be carried out using gel permeation chromatography (SDB copolymer with eluent toluene).

[0244] 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 mPas, 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 mPas, in particular 20 to 50 mPas (DIN 53015 Höppler Kugel 3) and optionally 200 to 340 mPas (DIN 53015 Höppler Kugel 4). The viscosity is generally determined using (DIN 53015 Höppler), whereby for the polydialkylsiloxanes containing ethylene groups the viscosity is determined using rotational viscosity cone (4740mm) / plate BU-Q 30.027) U0.2 / U1: DIN 53015 Höppler Kugel 5 can be used.

[0245] Optional structural agents include, for example, rheology aids such as pyrogenic silica, layered silicates, castor oil derivatives, PU thickeners, organically modified bentonites, polyureas, waxes, or the like. Palladium-containing compositions can be added to the curable compositions as hydrogen scavengers. Inorganic fillers, such as organic particulate polymers, can include silicon dioxide, pyrogenic silica, precipitated silica, quartz, and kaolin, preferably hydrophobic. Further surfactants are also available. KDP12312WO 17 March 2026

[0246] Among others, fatty alcohols such as ethoxylated fatty alcohols, especially C11 to C14 alcohols, are considered.

[0247] For example, 2-hydroxy-4-methoxybenzophones can be used as stabilizers.

[0248] 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, in particular in medicine or also pathological 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, in particular in the semiconductor field.Particularly preferred is the respective non-medical use of the composition according to the invention or a composition as a product for use in the impression taking of human, veterinary or marine soft tissue, in the impression taking in the medical, dental and / or veterinary fields.

[0249] The compositions according to the invention are suitable as impression materials with high toughness, where high tear resistance is necessary, in particular dental impression materials comprising impression materials for sulcus impressions, precision impression materials, situation impression materials, bite registration materials, duplication materials (applicable for the duplication of master models, such as all-ceramic restorations, inlays, onlays, cantilevers, as well as modeling materials, such as those used for gingival reconstruction).

[0250] The following are exemplary embodiments intended to illustrate the invention without limiting it to specific examples.

[0251] Examples of implementation

[0252] The viscosity is determined according to DIN 53015:2019 Höppler.

[0253] The vinyl group content can be determined by FTIR spectroscopy using a calibration curve. KDP12312WO March 17, 2026

[0254] Composition B (base paste) and composition A (catalyst paste) were each produced separately in a planetary mixer and homogenized. Subsequently, the resulting compositions A and B were each filled separately into two-chamber cartridges. Using a static mixer, composition B (base paste) and composition A (catalyst paste) were mixed in a 1:1 weight ratio in the following examples. The catalyst pastes were adjusted for activity so that the mixed pastes had a working time of 2.5 to 3.5 minutes, tested according to DIN EN ISO 4823:2021.

[0255] Consistency DIN EN ISO 4823:2021

[0256] Determination of consistency by preparing a mixing disc according to DIN EN ISO 4823:2021, (7.2., 7.2.1 (equipment and materials), preparatory measures (7.2.2) sample preparation and test procedure (7.2.3): Equipment and materials: Two glass plates, as load plates approx. 60 mm x 60 mm, > 3 mm thick, and a base plate of at least the same dimensions or larger.

[0257] Dispensing device (inner diameter: 10 mm tube) for applying (0.5 ± 0.2) ml of impression material to the base plate. Polyethylene films: wrinkle-free, approx. 60 mm x 60 mm and 0.035 mm thick (one per specimen). Polyethylene film discs: approx. 10 mm diameter, 0.035 mm thick (two per specimen). Testing instrument for applying a force of (14.7 ± 0.1) N, length measurement accuracy 0.5 mm. Procedure according to this standard.

[0258] The measuring instrument takes two diametrical measurements, one across the larger disc diameter and one across the smaller disc diameter. The average of the two measurements is given as the diameter.

[0259] Shore hardness A: based on DIN EN ISO 4823:2021 Type A (7.10.1 ff) as the hardness of bite registration materials: Crease-free polyethylene film, approximately 50 mm x 30 mm, 0.035 mm thick (two films per specimen); glass, polymer, or metal plates, approximately 50 mm x 30 mm and at least 3 mm thick; metal spacers, (> 6) mm high, e.g., ring-shaped; water bath, (35 ± 2) °C; Shore durometer according to ISO 48-4:2018 (Type A); Preparation of the specimens:

[0260] At least 1 ml of mixed material is applied to a glass plate covered with polyethylene film and spacers on the latter. The assembly is covered with polyethylene film and pressed against a glass plate to prepare a specimen with flat and plane-parallel surfaces (> 6 mm) and a diameter of at least 5 cm. The assembly is immersed in a water bath at 35 ± 1 °C for 2.5 minutes to harden. The specimen is removed from the mold and brought to the temperature prescribed for testing (23 ± 2 °C). Test procedure: Tests 60 min after the start of mixing. KDP12312WO 17 March 2026

[0261] Perform according to ISO 48-4:2018; place the specimen on a hard, horizontal, flat surface. Hold the durometer (7.10.1.5) in a vertical position, ensuring the tip of the indenter is at least 9 mm from any edge of the specimen. Apply the indenter foot to the specimen as quickly and smoothly as possible, keeping the foot parallel to the specimen's surface. Apply just enough pressure to establish firm contact between the indenter foot and the specimen. Mass of type A durometer: 1 kg; read the scale of the display after 3 seconds; advantageous: durometer stand. Contrary to the standard, the hardness of the mixtures in Tables 1 to 4 was determined 10 minutes after the start of mixing.

[0262] Processing time according to DIN EN ISO 4823:2021

[0263] Sample preparation: Rigid ring shape, height (9 ± 0.1) mm, inner diameter (25.0 ± 0.2 or 40.0 ± 0.2 mm, cavity). Planar base plate approx. 50 mm x 50 mm, approx. 6 mm thick. Release agent: e.g., silicone grease; Inert material: e.g., wax, for fixing the ring shape to the base plate; Timing device;

[0264] Device (Chapter 7.3.1.6 of the standard): Test processing time: Allows the application of a load according to Table A using a load bar with a base (0.16 mm), fixable at a height of 10 mm above the base of the ring-shaped specimen. Weight(s) are used so that the base of the load bar can penetrate the ring-shaped specimen material. Preliminary test: 10 s after contact, the base of the load bar should be able to sink 4 mm into the specimen material (5 mm above the base of the cavity). Reading accuracy: 0.1 mm.

[0265] Table A: Load and dimensions for processing time testing

[0266] Type 2 Type 3

[0267] Mold diameter 25 25

[0268] [mm]

[0269]

[0270] Load [N]* 5.88 + / -0.1 2.45 + / -0.1

[0271] *Total load: Load bar including all components and weights 1, 2 etc.)

[0272] Processing time test: Ring shape (see Table A), base plate, foot, load bar of the test device (7.3.1.6) coated with a thin film of release agent and fixed centrally to the base plate with inert material. Procedure according to section 7.3.2.1: Place weight 1, then weight 2 (total load: Table A) with weight support, load bar, and components. Determine target position (reading a): Insert the retaining pin into the foot of the load bar, lower the load bar until the retaining pin rests on the base plate (distance: foot as test plate and base plate (5.0 ± 0.1 mm, target position, a)). Subsequently: Adjust starting position: Underside of the test plate (10 ± 0.1 mm) above the surface of the base plate. Place weight 2 to adjust the weight according to Table A. KDP12312WO March 17, 2026

[0273] Mixing a streak-free sample; transferring the samples into the cavity (7.3.2.2): bubble-free and flush with the ring mold; centering under the load bar; test procedure: unlocking the load bar 1 s before the start of the processing time specified in the instructions for use (in the case of mixtures 1 to 5; processing time 2 minutes 30 seconds); lowering the foot into the sample material in the cavity of the ring mold for 10 s. Reading the final position of the test plate as a reading. b. Sample material (paste) has an assumed processing time of 2.5 and 3.5 min: If the test plate has reached the target position (reading (ab) < 0.1 mm), the specimen has passed the test. Otherwise, the test has failed.

[0274] Tensile strength (toughness)

[0275] To determine the tensile strength (toughness, [N / mm²]) 2]) are compositions according to DIN EN ISO 4823:2021; types 1, 2 or 3 preferred, types 2 and 3 particularly preferred, type 3 most preferred. The determination of the tensile strength (Rm) [N / mm²] is also carried out within the scope of this specification. 2 ], Elongation at break (s-Fmax) [%] and / or the tensile energy (W) [Nmm],

[0276] In a force-displacement-strain diagram, which is recorded during tensile testing of materials, the elongation at break is derived from the relative strain until fracture in relation to the original dimension, and the tensile strength is derived from the maximum force until rupture. The energy absorbed by the material is proportional to the area under the force / strain curve and is called tensile energy. Relating this to the cross-sectional area of ​​the specimen yields the tensile strength (toughness).

[0277] A composition that produces a mixed disc with a diameter greater than 31 mm (Type 2), preferably greater than 36 mm (Type 3), is considered particularly advantageous for applications involving impressions of deeply prepared teeth in the sulcus or gingiva. A composition capable of forming a mixed disc larger than 36 mm and exhibiting high tensile strength after setting, thus preventing material from tearing during demolding, is considered especially beneficial. However, even such high tensile strength is insufficient in practice to prevent undercuts, undercuts, and tapered areas in the interdental spaces, which are sometimes filled and thus formed by the impression material in very thin layers during the impression process, from tearing and leaving set remnants of the composition in the interdental spaces or sulcus.Only a simultaneously high elongation at break of the set composition allows the material to expand or stretch sufficiently to slide over the undercuts and convex teeth during demolding / removal of the tray without tearing. KDP12312WO March 17, 2026.

[0278] Determining the tensile strength [N / mm²] 2The elongation at break [%] and the tensile energy [Nmm] are determined in accordance with DIN 53504:2017, in particular according to the following methods, whereby the values ​​are preferably obtained from at least five measurements that are averaged: Curing and measurement: 23 °C + / - 2 °C, 50% + / - 10% relative humidity, material, auxiliary materials and equipment are exposed to the climate for 10 h or more, Lo = 10 mm, steel mold for producing the test specimens in the form of standard bar S2, Zwick 1435 testing device (load cell 500 N, pull-off speed: 500 mm / min; software: tensile test) set up for tensile testing, long-stroke transducer: parallel-aligned corundum discs, polyester film with 0.06 mm thickness, automix system as standard without intraoral tip, otherwise specify. Sample preparation: Place a plate with foil on top, add a frame, fill with material, cover with foil, press at least 3 bar, for processing time according to the manufacturer's instructions. Measure 60 minutes after mixing; sensor contact pressure: max.Spring force (distance = 72 mm), set force to 0.

[0279] Tensile test with evaluation of the tensile strength, modulus of elasticity, elongation at break, and tensile energy of a molding material: Standard test conditions: The test is carried out under a constant ambient climate of 23° ± 2° C and 50% ± 10% relative humidity. The material to be tested, auxiliary materials, and equipment must be exposed to the described climate for at least 10 hours (curing and measurement take place at 23 ± 2° C; initial displacement length Lo during measurement is 10 mm). Testing equipment / auxiliary materials: Steel mold for producing a 150 x 100 x 2 mm elastomer plate, plus a cutting die for standard bar S2 (DIN 53504) or a steel mold for producing test specimens in the shape of standard bar S2 (Zwick 1435 set up for tensile strength), material to be tested, stopwatch, mixing block, spatula, film (polyester film i = 0.06 mm). Dosage: Mixing and dosing from the 50 ml 1:1 CD with attached mixer.Mixing time: Mixing time is the period from the start of mixing the components until a uniform mixture without color streaks and a consistent color is achieved. For materials mixed with static / dynamic mixers, the start of the mixing time is defined as the point at which the different components first come into contact. This example describes mixing and dosing from the 50 ml 1:1 CD with the mixer attached. Sample preparation: The lower plate is lined with foil, the frame is placed on the foil, and the mixed material is poured in with a slight excess. The material is covered with foil, the upper plate is placed on top, and the mold is screwed shut or pressed together. After curing, the plate / sample is demolded, and the samples are punched out with a die, if necessary. KDP12312WO March 17, 2026.

[0280] Test setup: Measuring cell 500 N (force range max. 50 N), pull-off speed 500 mm / min, initial stroke length Lo = 10 mm, input of the cross-sectional area of ​​the standard bar. Test procedure: The test is performed 1 hour after mixing begins. The specimens are clamped in the jaws so that they are centered on the displacement measuring sensors. The contact pressure of the sensors must be adjusted so that they do not slip during the test and simultaneously do not damage the specimen! If the settings are correct, the test can be carried out according to the tensile strength program. Result: Tensile strength [N / mm²] 2 Tensile strength as the average of at least 5 measurements; Tensile strength = force at break / initial cross-sectional area; quotient of the force FR measured at the moment of breakage and the initial cross-sectional area Ao of the specimen. Modulus of elasticity [N / mm²] 2The Young's modulus is calculated as the average of at least 5 measurements. It is the slope of the force / strain curve, determined as a secant at 20% and 50% strain. Elongation at break [%]:

[0281] Average of at least 5 measurements; Elongation at break = (LR - L0) / L0 x 100; Quotient of the change LR - LO measured at the moment of breakage, the measurement of the gauge length LR, and the initial gauge length Lo of the specimen. Tensile energy [Nmm]: Average of at least 5 measurements; Tensile energy is calculated as the area under the stress-strain curve; Tensile energy (area under the stress-strain curve) [Nmm], Toughness [N / mm²] 2 ]: W Fma x / Vol.

[0282] Table 1: Terms

[0283] iii) Mixture comprising ie) Mixture, in particular premixture, comprising di-vinyl and filler according to iii) terminated dimethylpolysiloxane (viscosity: 20,000 mPas, mixture, in particular vinyl content approx. 0.04 mmol / g) and inorganic filler premix according to iii) Mixture, in particular premixture

[0284] Di-vinyl-terminated dimethylpolysiloxane as polysiloxanes ib)

[0285] (Viscosity: 1000 mPas, vinyl content approx. 0.1 mmol / g)

[0286] Di-vinyl-terminated dimethylpolysiloxane 65,000 mPas, ic)

[0287] Vinyl content approx. 0.03 mmol / g

[0288] Di-vinyl-terminated dimethylpolysiloxane (viscosity: ie)

[0289] 10,000 mPas, vinyl content approx. 0.06 mmol / g)

[0290] Di-vinyl-terminated dimethylpolysiloxane (viscosity:

[0291] 10,000 mPas, vinyl content approx. 0.06); (contained at 70% in ie) from iii) mixture,

[0292] Mixture of dimethylpolysiloxane 10,000 mPas and especially premix

[0293] inorganic filler according to iii) mixture, in particular premix

[0294] Di-vinyl-terminated dimethylpolysiloxane (viscosity: ide)

[0295] 20,000 mPas, vinyl content approx. 0.04 mmol / g)

[0296] Polysiloxane containing at least 2 Si-H groups per molecule. Polysiloxane, Si-H content 1.4 mmol / g

[0297]

[0298] KDP12312WO March 17, 2026

[0299] Pigments, 20% in di-vinyl-terminated dimethylpolysiloxane pigment(s): Pigments (polysiloxane, viscosity: 1,000 mPas, vinyl content approx. 0.1 mmol / g)

[0300] Opaque agent: TiCh titanium dioxide anatase

[0301] Rheology additive: chemically modified castor oil. Via iii) mixture, in particular premix, added SiC>2 from iii) mixture, inorganic filler contained by iii) mixture: di-vinyl, in particular premix, terminated dimethylpolysiloxane 10,000 mPas and inorganic filler.

[0302] hydrophobic silica, BET 135 to 185 m 2 / g, 2 to 4% hydrophobic silica

[0303] Carbon content

[0304] Inorganic filler:

[0305] Cristobalite, medium grain size 2 - 5 pm

[0306] Cristobalite

[0307] Hydrogen-absorbing precious metal powder, such as H2 absorber

[0308] Palladium, on an inert substrate

[0309] Surfactant: Polyether-functionalized siloxane oligomer, hydrosilination catalyst: Platinum catalyst vinyl-siloxane complex; 4% platinum complex containing platinum catalyst complex, dissolved in di-vinyl-terminated dimethylpolysiloxane

[0310]

[0311] 4% Pt vinyl content 0.1 mmol / g

[0312] Table 2: Comparative example and examples according to the invention

[0313] Together, Together, Composition 1 not

[0314] setting 2 setting 3 according to the invention

[0315] Ingredients [%] Base Kat Base Kat Base Kat iii) Mixture,

[0316] especially 0.0 0.0 5.0 5.0 10.0 10.0 premix

[0317] ib) 17.5 40.2 16.1 35.4 12.6 31.9 ic) 11.5 10.0 11.5 10.0 11.5 10.0 ie) 0.0 0.0 0.0 0.0 0.0 0.0 ie) in iii) mixture,

[0318] especially 0.0 0.0 3.5 3.5 7.0 7.0 premix

[0319] id) 9.6 10.0 9.3 10.0 9.3 10.0 Si-H groups

[0320] 17.6 0.0 16.4 0.0 16.4 0.0 containing polysiloxane

[0321] Pigment(s) 1.0 0.0 1.2 0.0 1.2 0.0 Additive (Opacifying Agent):

[0322] 5.0 5.0 4.8 5.0 4.8 5.0 TiO2

[0323] Rheology additive 0.4 0.4 0.4 0.4 0.4 0.4

[0324]

[0325] KDP12312WO March 17, 2026

[0326] SiCh from iii) mixture,

[0327] especially 0.0 0.0 1.5 1.5 3.0 3.0 premix

[0328] Hydrophobic silica 0.0 0.0 0.0 0.0 0.0 0.0 Cristobalite 32.7 34.0 30.7 33.7 29.2 32.2 H2 absorber 0.2 0.0 0.2 0.0 0.2 0.0 Surfactant: 4.6 0.0 4.4 0.0 4.4 0.0 Platinum catalyst complex

[0329] 0.0 0.4 0.0 0.4 0.0 0.4

[0330]

[0331] 4% PtKDP12312WO March 17, 2026

[0332] Table 3: Comparative example and examples according to the invention

[0333] Composition 6; Together, Comparative example to composition 4, composition 5

[0334] 5 Ingredients Base Kat Base Kat Base Kat iii.) Mixture,

[0335] 15.0 15.0 20.0 20.0 0.0 0.0 especially premix

[0336] ib) 9.1 28.4 5.6 24.9 5.6 24.9 ic) 11.5 10.0 11.5 10.0 11.5 10.0 ie) 0.0 0.0 0.0 0.0 14.0 14.0 ie) in iii.) mixture

[0337] 10.5 10.5 14.0 14.0 0.0 0.0 especially premix

[0338] id) 9.3 10.0 9.3 10.0 9.3 10.0 containing Si-H groups

[0339] 16.4 0.0 16.4 0.0 16.4 0.0 Polysiloxane

[0340] Pigment(s) 1.2 0.0 1.2 0.0 1.2 0.0 Additive (Opacifying Agent):

[0341] 4.8 5.0 4.8 5.0 4.8 5.0 TiO2

[0342] Rheology additive 0.4 0.4 0.4 0.4 0.4 0.4 SiO2 from iii.) mixture,

[0343] 4.5 4.5 6.0 6.0 0.0 0.0 especially premix

[0344] Hydrophobic silica 0.0 0.0 0.0 0.0 6.0 6.0 Cristobalite 27.7 30.7 26.2 29.2 26.2 29.2 H2 absorber 0.2 0.0 0.2 0.0 0.2 0.0 Surfactant: 4.4 0.0 4.4 0.0 4.4 0.0 Platinum catalyst complex

[0345] 0.0 0.4 0.0 0.4 0.0 0.4

[0346]

[0347] 4% PtKDP12312WO March 17, 2026

[0348] Table 4: Comparative example and examples according to the invention

[0349] Composition 9; Together. Comparison example to composition 7 and composition 8.

[0350] 8 Ingredients Base Kat Base Kat Base Kat iii) Mixture, in particular

[0351] 25.0 25.0 22.4 38.3 0.0 0.0 Premix

[0352] ib) 2.1 21.4 3.9 12.1 3.9 12.1 ic) 11.5 10.0 11.5 10.0 11.5 10.0 ie) 0.0 0.0 0.0 0.0 15.7 26.8 ie) in iii) mixture,

[0353] 17.5 17.5 15.7 26.8 0.0 0.0 especially premix

[0354] id) 9.3 10.0 9.3 10.0 9.3 10.0 containing Si-H groups

[0355] 16.4 0.0 16.4 0.0 16.4 0.0 Polysiloxane

[0356] Pigment(s) 1.2 0.0 1.2 0.0 1.2 0.0 Additive (Opacifying Agent):

[0357] 4.8 5.0 4.8 5.0 4.8 5.0 TiO2

[0358] Rheology additive 0.4 0.4 0.4 0.4 0.4 0.4 SiO2 from iii) mixture,

[0359] 7.5 7.5 6.7 11.5 0.0 0.0 especially premix

[0360] Hydrophobic silica 0.0 0.0 0.0 0.0 6.7 11.5 Cristobalite 24.7 27.7 25.5 23.7 25.5 23.7 H2 absorber 0.2 0.0 0.2 0.0 0.2 0.0 Surfactant 4.4 0.0 4.4 0.0 4.4 0.0 Platinum catalyst complex

[0361] 0.0 0.4 0.0 0.4 0.0 0.4

[0362]

[0363] 4% PtKDP12312WO March 17, 2026

[0364] Table 5: Comparative example and examples according to the invention Composition Together12; Comparative setting 10 setting 11

[0365] Example of 11 ingredients: Base Kat Base Kat Base Kat iii.) Mixture,

[0366] 27.0 43.0 29.2 50.8 0.0 0.0 especially premix

[0367] ib) 0.7 8.9 0.0 2.5 0.0 2.5 ic) 11.5 10.0 11.5 10.0 11.5 10.0 ie) 0.0 0.0 0.0 0.0 20.4 35.6 ie) in iii.) mixture;

[0368] 18.9 30.1 20.4 35.6 0.0 0.0 especially premix

[0369] id) 9.3 10.0 9.3 10.0 9.3 10.0 containing Si-H groups

[0370] 16.4 0.0 16.4 0.0 16.4 0.0 Polysiloxane

[0371] Pigment(s) 1.2 0.0 1.2 0.0 1.2 0.0 Additive (Opacifying Agent):

[0372] 4.8 5.0 4.8 5.0 4.8 5.0 TiO2

[0373] Rheology additive 0.4 0.4 0.4 0.4 0.4 0.4 SiO2 from iii.) mixture;

[0374] 12.9 8.8 15.2 0.0 0.0 especially premix 8.1

[0375] Hydrophobic silica 0.0 0.0 0.0 0.0 8.8 15.2 Cristobalite 24.1 22.3 22.6 20.8 22.6 20.8 H2 absorber 0.2 0.0 0.2 0.0 0.2 0.0 Surfactant 4.4 0.0 4.4 0.0 4.4 0.0 Platinum catalyst complex

[0376] 0.0 0.4 0.0 0.4 0.0 0.4

[0377]

[0378] 4% PtKDP12312WO March 17, 2026

[0379] Table 6: Example according to the invention

[0380] Composition 13

[0381] Ingredients Base Cat

[0382] iii) Mixture; in particular

[0383] 39.2 60.8

[0384] premix

[0385] ib) 0.0 1.5

[0386] ic) 11.5 10.0

[0387] ie) 0.0 0.0

[0388] ie) in iii) mixture;

[0389] 27.4 42.6

[0390] especially premixing

[0391] id) 9.3 10.0

[0392] containing Si-H groups

[0393] 16.4 0.0

[0394] Polysiloxane

[0395] Pigment(s): Pigment orange 1.2 0.0

[0396] Additive (opticizing agent): TiCh 4.8 5.0

[0397] Rheology Additive 0.4 0.4

[0398] SiC>2 from iii) mixture;

[0399] 11.8 18.2

[0400] especially premixing

[0401] hydrophobic silica 0.0 0.0

[0402] Cristobalite 12.6 11.9

[0403] H2 Absorber 0.2 0.0

[0404] Surfactant: 4.4 0.0

[0405] Platinum catalyst complex

[0406] 0.0 0.4

[0407]

[0408] 4% Pt

[0409] Table 7.1: Summary of measured values ​​for the individual mixtures Composition 1 Total Total measured values

[0410] not according to the invention setting 2 setting 3 Added quantity of

[0411] SiC>2 (pyrogenic

[0412] silica) by the iii.) 0.0 1.5 3.0 mixture; in particular

[0413] Premix [wt.%]

[0414] Mixing disc according to DIN EN

[0415] 45 43 43 4823; 2021-06 [mm]

[0416] Processing time after

[0417] > 2.5 to < 3.5 min > 2.5 to < 3.5 min > 2.5 to < 3.5 min DIN 4823

[0418] Shore A hardness 10 min 34 38 39 Tensile strength [N / mm²] 2 ] 1.7 1.7 2.0

[0419]

[0420] Elongation at break [%] 209 193 200KDP12312WO March 17, 2026

[0421] Tear energy [N*mm] 155 155 181 Toughness [N / mm] 2 ] 1.9 1.9 2.3

[0422]

[0423] E-modulus [N / mm²] 2 ] 0.8 1.0 1.0

[0424] Table 7.2: Summary of measured values ​​for the individual mixtures Composition 6; Summary of measured values ​​Comparison example to composition 4 composition 5

[0425] 5 Added amount of

[0426] SiC>2 (pyrogenic

[0427] silica) by the iii.) 4.5 6.0 6.0 mixture; in particular

[0428] Premix [wt.%]

[0429] Mixing disc according to DIN EN

[0430] 42 41 41 4823; 2021-06 [mm]

[0431] Processing time according to DIN 4823: > 2.5 to < 3.5 min > 2.5 to < 3.5 min

[0432] Shore A hardness 10 min 39 39 30 Tensile strength [N / mm²] 2 ] 2.1 2.3 2.0 Elongation at break [%] 228 256 329 Tensile energy [N*mm] 228 282 299 Toughness [N / mm] 2 ] 2.9 3.5 3.7

[0433]

[0434] E-modulus [N / mm²] 2 ] 1.0 1.0 0.6

[0435] Table 7.3: Summary of measured values ​​for the individual mixtures Composition 9; Summary of measured values ​​Comparison example to composition 7 composition 8

[0436] 8 Added amount of

[0437] SiC>2 through the iii.)

[0438] 7.5 9.1065 9.1065 mixture; in particular

[0439] Premix [wt.%]

[0440] Mixing disc according to DIN EN

[0441] 38 38 37 SiO24823; 2021-06 [mm]

[0442] Processing time according to DIN

[0443] > 2.5 to < 3.5 min > 2.5 to < 3.5 min > 2.5 to < 3.5 min 4823

[0444] Shore A hardness 10 min 40 41 27 Tensile strength [N / mm²] 2 ]: 2.6 3.2 2.0 Elongation at break [%] 261 338 421 Tensile energy [N*mm] 318 520 386 Toughness [N / mm] 2 ]: 4.0 6.5 4.8

[0445]

[0446] E-modulus [N / mm²] 2 ]: 1.0 1.1 0.5KDP12312WO March 17, 2026

[0447] Table 7.4: Summary of measured values ​​for the individual mixtures

[0448] Composition 12; Measured values

[0449] Setting 10 Setting 11 Comparative example to 11 Added quantity of

[0450] SiO2 through the iii.)

[0451] 10.5 12 12 mixture, in particular

[0452] Premix [wt.%]

[0453] Mixing disc according to DIN EN

[0454] 38 37 35 4823; 2021-06 [mm]

[0455] Processing time according to DIN 4823: > 2.5 to < 3.5 min > 2.5 to < 3.5 min

[0456] Shore A hardness 10 min 39 39 24 Tensile strength [N / mm²] 2 ]: 3.45 3.82 2.35 Elongation at break [%] 353 410 547 Tensile energy [N*mm] 612 764 524 Toughness [N / mm] 2 ] 7.6 9.6 6.6

[0457]

[0458] E-modulus [N / mm²] 2 ] 1.0 0.1 0.4

[0459] Table 7.5: Summary of measured values ​​of the mixture

[0460] Measured values ​​Composition 13 Amount of SiÜ2 added by the iii.) mixture,

[0461] 15 especially premix [wt.%]

[0462] Mixed disc according to DIN EN 4823; 2021-06 [mm] 39 Processing time according to DIN 4823 [min] > 2.5 to < 3.5 min Shore A hardness 10 min 38 Tensile strength [N / mm] 2 ] 4.6 Elongation at break [%] 416 Breaking energy [N*mm] 833 Toughness [N / mm] 2 ]: 10.4

[0463]

[0464] E-modulus [N / mm²]2 ]: 0.9

[0465] The advantages of the invention can be clearly demonstrated in Figures 1 to 3 below, which illustrate the influence of the iii. mixture, in particular the premix, with respect to tensile strength and toughness at a comparatively constant modulus of elasticity and constant elongation at break, compared to pastes with the same content of hydrophobized silica in the overall composition without the use of the compound as iii.) the mixture, in particular the premix. Furthermore, this advantage can be achieved without a negative impact on hardness. This negative impact on hardness is evident in the comparison pastes. Moreover, the comparison pastes show a KDP12312WO March 17, 2026

[0466] Influence on the modulus of elasticity; the modulus of elasticity is comparatively significantly reduced, which indicates that the elastomer is significantly less stiff in the cured state.

[0467] Tables 7.1 to 7.5 and Figures 1 to 3 show the measured values ​​of the compositions with and without the use of iii.) mixture, which is added as a compound to the composition to adjust the content of hydrophobized silica as an inorganic filler whose surface is hydrophobized.

[0468] The toughness of the compositions according to the invention increases with increasing content of hydrophobized silica, while the Shore A hardness (10 min) remains almost constant for compositions containing a certain amount of mixture iii. In contrast, the Shore A hardness (10 min) for the comparison compositions with the same content of hydrophobized silica, which was not introduced into the composition via mixture iii, is below the value for a composition without silica (0 wt.%, Table 7.1 and Fig. 3).

[0469] Figures 1 and 2 show the values ​​for the tensile strength of compositions with the same content of hydrophobized silica (symbol: circle (filled area) iii.) mixture, in particular premix; circle (lines): without iiii. mixture, in particular premix, from which it can be seen that the tensile strength for the composition with iii. mixture, in particular premix, is significantly higher. The elongation at break is represented as a triangle (triangle, unfilled without iii. mixture, in particular premix, and with iii. mixture, in particular premix, as a triangle, filled).

[0470] The toughness (symbol: rhombus (filled area)) iii. mixture, in particular premix; rhombus (lines): without iiii. mixture, in particular premix) is also improved with a content of approximately 9 wt.% hydrophobized silica with iii. mixture, in particular premix, compared to the same amount of silica that was not added via a mixture (compound or premix).

[0471] The advantages of the mixture, in particular the premix, can be demonstrated especially with reference to the iii. mixtures, in particular premixes, with a filler content of approximately 6 wt.% from the iii. mixture in the total composition of 100 wt.%, i.e., a filler content specifically introduced by the iii. mixture, in particular the premix. Likewise, the advantage of the iii. mixture, in particular the premix, can be demonstrated particularly well from a total content of hydrophobized inorganic filler of greater than or equal to 8 wt.% in the composition, introduced by the iii. mixture, in particular KDP12312WO 17 March 2026.

[0472] Premixture, in which composition A and / or B or the mixed composition, in particular comprising A and / or B, are shown.

[0473] Character description:

[0474] The values ​​in the figures are taken from Tables 7.1 to 7.5.

[0475] Fig. 1: Elongation at break and modulus of elasticity (y-axes) versus content of hydrophobized silica in wt.% in the total composition with or without iii. mixture, in particular premix,

[0476] : Elongation at break [%] without iii. mixture (;

[0477]

[0478] E-modulus [N / mm²] 2 ] without iii. mixture;

[0479] : Elongation at break [%] with iii. mixture;

[0480]

[0481] E-modulus [N / mm²] 2 ] with iii. mixture)

[0482] Fig. 2: Tensile strength and toughness (y-axes) compared to the content of hydrophobized silica in the overall composition with or without iii. mixture, in particular premix,

[0483]

[0484] ( : Tensile strength [N / mm²] 2 ] without iii. mixture; w Toughness [N / mm] 2 ] without iii. mixture;

[0485] Tensile strength [N / mm²] 2 ] with iii. mixture; A : Toughness [N / mm ] 2 ] with iii. mixture).

[0486] Fig. 3: Shore A hardness (10 min) (y-axes) compared to the content of hydrophobized silica in the overall composition with or without iii. mixture, in particular premix,

[0487] o Shore A hardness without iii. mixture; ♦ : Shore A hardness with iii. mixture)

Claims

KDP12312WO March 17, 2026 Patent claims 1. A 2K composition, which exists as two separate compositions A and B, for the production of a curable composition, wherein a. Composition A comprises addition-crosslinkable organofunctional polysiloxanes comprising i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, ii. inorganic filler comprising cristobalite, iii. Mixture, in particular premixture, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and an inorganic filler whose surface has at least partially covalently bonded hydrocarbon groups, as well as iv. optional additives, pigments and / or dyes, and v. optionally comprising a hydrosilylation catalyst, and the b. Composition B comprises i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, ii. inorganic filler comprising cristobalite, iii. Mixture, in particular premixture, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and an inorganic filler whose surface has at least partially covalently bonded hydrocarbon groups, as well as iv. optional additives, pigments and / or dyes. v. polysiloxanes containing at least two Si-H groups.

2. Composition according to claim 1, characterized in that the i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, a mixture of linear polydialkylsiloxanes containing terminal ethylene groups, comprising linear polydialkylsiloxanes containing terminal ethylene groups, in particular vinyl-terminated dimethylpolysiloxanes with 25 to 2500 siloxane units, preferably unbranched dimethylpolysiloxanes, preferably linear polydialkylsiloxanes containing terminal ethylene groups, optionally ia) with a number-average molecular weight of 2500 to 9950 Mn and a mass-average molecular weight of 3000 to 14925 Mw, wherein the polydispersity (D) is from 1.2 to 1.

5. KDP12312WO 17 March 2026 is, in particular, 0.2 to 0.8 mmol / g, in particular 0.2 to 0.5 mmol / g, and / or ib) Linear polydialkylsiloxanes containing terminal ethylene groups, having a number-average molecular weight of 10,000 to 25,000 Mn and a mass-average molecular weight of 12,000 to 37,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular 0.08 to 0.20 mmol / g, in particular 0.1 to 0.15 mmol / g, and / or ic) linear polydialkylsiloxanes containing terminal ethylene groups, having a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66,000 to 112,500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular having terminal ethylene groups of 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g, and / or id) Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 40,000 to 54,500 Mn and / or a mass-average molecular weight of 48,000 to 82,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups, and / or ie) Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 25,500 to 39,500 Mn and / or a mass-average molecular weight of 30,000 to 60,000 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.05 to 0.08 mmol / g terminal ethylene groups, and / or if) optionally containing terminal ethylene groups linear polydialkylsiloxanes with a number-average molecular weight of 75000 to 100000 Mn and / or a mass-average molecular weight of 90000 to 150000 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular with 0.02 to 0.03 mmol / g, in particular with 0.023 to 0.027 mmol / g terminal ethylene groups.

3. Composition according to claim 1 or 2, characterized in that the i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups comprise a mixture of Linear polydialkylsiloxanes containing 25 to 80 wt% terminal ethylene groups, with a number-average molecular weight of 10,000 to 25,000 Mn and a mass-average molecular weight of 12,000 to 37,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular 0.08 to 0.20 mmol / g, in particular 0.1 to 0.15 mmol / g, and / or KDP12312WO 17 March 2026 Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 55,000 to 75,000 Mn and a mass-average molecular weight of 66,000 to 112,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with terminal ethylene groups of 0.018 to 0.055 mmol / g, preferably 0.03 to 0.04 mmol / g, and / or Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 40,000 to 54,500 Mn and / or a mass-average molecular weight of 48,000 to 82,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups, and optionally with a number-average molecular weight of 2500 to 9950 Mn and a mass-average molecular weight of 3000 to 14925 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular from 0.2 to 0.8 mmol / g, in particular from 0.3 to 0.6 mmol / g, and optionally Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 25,500 to 39,500 Mn and / or a mass-average molecular weight of 30,000 to 60,000 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.05 to 0.08 mmol / g terminal ethylene groups, and / or optionally Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 75,000 to 100,000 Mn and / or a mass-average molecular weight of 90,000 to 150,000 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular with 0.02 to 0.03 mmol / g, in particular with 0.023 to 0.027 mmol / g terminal ethylene groups, with regard to a total composition of 100 wt% of composition A and / or B.

4. Composition according to one of claims 1 to 3, characterized in that the iii. mixture, in particular premixture, comprises addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and an inorganic filler, the surface of which has at least partially covalently bonded hydrocarbon groups, wherein the linear polydialkylsiloxanes containing at least two terminal ethylene groups a) selected from ia) with a number-mean molecular weight of 2500 to 9950 Mn and a mass-mean molecular weight KDP12312WO 17 March 2026 from 3000 to 14925 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular with 0.2 to 0.8 mmol / g, in particular 0.3 of 0.6 mmol / g, and / or ib) linear polydialkylsiloxanes containing terminal ethylene groups with a number-average molecular weight of 10000 to 25000 Mn and a mass-average molecular weight of 12000 to 37500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular with 0.08 to 0.20 mmol / g, in particular 0.1 of 0.15 mmol / g, and / or ic) linear polydialkylsiloxanes containing terminal ethylene groups with a number-average molecular weight of 55000 to 75000 Mn and a mass-average molecular weight of 66000 to 112500 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular from 0.018 to 0.055 mmol / g, preferably from 0.03 to 0.04 mmol / g terminal ethylene groups, and / or id) Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 40,000 to 54,500 Mn and / or a mass-average molecular weight of 48,000 to 82,500 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.02 to 0.08 mmol / g, in particular 0.04 to 0.05 mmol / g terminal ethylene groups, and / or ie) Linear polydialkylsiloxanes containing terminal ethylene groups, with a number-average molecular weight of 25,500 to 39,500 Mn and / or a mass-average molecular weight of 30,000 to 60,000 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.05 to 0.08 mmol / g terminal ethylene groups, and / or if) optionally containing terminal ethylene groups linear polydialkylsiloxanes with a number-average molecular weight of 75000 to 100000 Mn and / or a mass-average molecular weight of 90000 to 150000 Mw, wherein the polydispersity (D) is from 1.2 to 1.5, in particular with 0.02 to 0.03 mmol / g, in particular with 0.023 to 0.027 mmol / g terminal ethylene groups, or b) comprise polysiloxanes ie) and optionally a mixture comprising ia), ib), ic), id) and / or if).

5. Composition according to any one of claims 1 to 4, characterized in that - the composition A comprises i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of Linear polydialkylsiloxanes containing 20 to 60 wt% terminal ethylene groups, in particular comprising ib) and / or ic) and / or id) and optionally ia) and / or if), and KDP12312WO 17 March 2026 iii. 2 to 70 wt.%, in particular 5 to 40 wt.%, particularly preferably 10 to 45 wt.%, in particular ie) linear polydialkylsiloxanes containing terminal ethylene groups, having a number-average molecular weight of 25500 to 39500 Mn and / or a mass-average molecular weight of 30000 to 60000 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.05 to 0.08 mmol / g terminal ethylene groups, from the mixture, in particular premix, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and an inorganic filler whose surface has hydrocarbon groups, in relation to a total composition of 100 wt.% of composition A, and - composition B includes i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of Linear polydialkylsiloxanes containing 20 to 45 wt.%, in particular 20 to 35 wt.%, terminal ethylene groups, in particular comprising ib) and / or ic) and / or id) and optionally ia) and / or if), iii. Linear polydialkylsiloxanes containing 2 to 70 wt.%, in particular 5 to 40 wt.%, particularly preferably 10 to 30 wt.%, in particular ie) containing terminal ethylene groups, with a number-average molecular weight of 25500 to 39500 Mn and / or a mass-average molecular weight of 30000 to 60000 Mw, wherein the polydispersity (D) is 1.2 to 1.5, in particular with 0.05 to 0.08 mmol / g terminal ethylene groups, from the mixture, in particular premix, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and an inorganic filler whose surface has hydrocarbon groups, in relation to a total composition of 100 wt.% of composition B.

6. Composition according to any one of claims 1 to 5, characterized in that - the composition A comprises i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of linear polydialkylsiloxanes containing 0.1 to 25 wt.% terminal ethylene groups comprising ib) and optional ic) and / or id) and / or optional ia), ie) and / or if), relating to a total composition of 100 wt% of composition A, and KDP12312WO 17 March 2026 - composition B includes i. addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture of linear polydialkylsiloxanes containing terminal ethylene groups, comprising ib) and 0 to 20 wt.%, in particular 0 to 9 wt.%, including terminal ethylene groups optional ic) and / or id) and / or optional ia), ie) and / or if), with respect to a total composition of 100 wt.% of the Composition B.

7. Composition according to one of claims 1 to 6, characterized in that the cristobalite is hydrophobized, in particular the surface has partially to completely alkyl groups.

8. Composition according to one of claims 1 to 5, characterized in that the iii. mixture, in particular premixture, comprises at least two linear polysiloxanes containing terminal ethylene groups and at least two polydimethylsiloxanes having terminal inyl groups.

9. Composition according to one of claims 1 to 7, characterized in that the iii. mixture, in particular premix, comprises 50 to 80 wt.% addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and 20 to 50 wt.% inorganic fillers whose surface has covalently bonded hydrocarbon groups, wherein the total composition of the mixture is 100 wt.%.

10. Composition according to one of claims 1 to 9, characterized in that the surface of the inorganic filler in the iii. mixture, in particular premix, has hydrocarbon groups which originate from silandialkylalkyl groups with alkyl of 1 to 8 C atoms and vinyl groups.

11. Composition according to any one of claims 1 to 9, characterized in that the iii. mixture, in particular premix, comprises as an inorganic filler silicon dioxide, in particular silica, preferably pyrogenic silica, particularly preferably pyrogenic silica whose surface is hydrophobized with silandimethylvinyl groups, silanetrimethyl groups and / or mixtures of silandimethylvinyl groups and / or silanetrimethyl groups. KDP12312WO March 17, 2026 12. Composition according to any one of claims 1 to 11, characterized in that the composition comprises A and / or B. vi. Opaque agent, in particular barium salt and / or titanium dioxide, in particular 0.5 to 7.5 wt% titanium dioxide, preferably crystalline titanium dioxide.

13. Composition according to one of claims 1 to 12, characterized in that the iv. additives comprise surfactants, in particular surfactants and / or wetting agents.

14. Composition according to any one of claims 1 to 13, characterized in that a. the composition A comprises addition-crosslinkable, organofunctional polysiloxanes comprising i. Linear polysiloxanes containing at least two terminal ethylene groups and adding 15 to 60 wt.% crosslinking by addition, ii. comprising 5 to 45 wt.% filler cristobalite, iii. 2 to 70 wt.% mixture, in particular premix, comprising addition-curing agents of at least two linear polysiloxanes containing terminal ethylene groups and an inorganic filler whose surface has hydrocarbon groups, as well as iv. 0 to 15 wt.% at least one additive(s), pigment(s) and / or dye(s), v. 0 to 3 wt.% comprising a hydrosilylation catalyst, and vi. 0 to 10 wt.% opacifying agent, in particular titanium dioxide, wherein the total composition A comprises 100 wt.%, and b. the composition B comprises i. Linear polysiloxanes containing at least two terminal ethylene groups and adding 10 to 40 wt.% crosslinking by addition, ii. comprising 5 to 45 wt.% filler cristobalite, iii. 2 to 70 wt.% mixture, in particular premix, comprising addition-curing agents of at least two linear polysiloxanes containing terminal ethylene groups and an inorganic filler whose surface has at least hydrocarbon groups, as well as iv. 0 to 15 wt.% at least one additive(s), pigment(s) and / or dye(s), v. 0.5 to 30 wt.% at least two polysiloxanes containing Si-H groups and vi. 0 to 10 wt.% opacifying agent, in particular titanium dioxide, where the total composition B comprises 100 wt.%. KDP12312WO 17 March 2026 15. Composition according to any one of claims 1 to 14, characterized in that a. Composition A comprises addition-crosslinkable organofunctional polysiloxanes comprising i. 15 to 60 wt.% addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture comprising polysiloxanes ib), ic) and id) and optionally comprising polysiloxanes ia), ie) and / or if). ii. comprising 5 to 45 wt.% filler cristobalite, iii. 10 to 70 wt.% mixture, in particular premix, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, in particular including polysiloxanes (ie), and inorganic filler whose surface has hydrocarbon groups, as well as iv. 0 to 15 wt.% at least one additive(s), pigment(s) and / or dye(s), v. 0 to 3 wt.% comprising a hydrosilylation catalyst, and vi. 0 to 10 wt.% opacifying agent, in particular titanium dioxide, where the total composition A comprises 100 wt.%, b. Composition B comprises addition-crosslinkable organofunctional polysiloxanes comprising i. 10 to 450 wt.% addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups, comprising a mixture comprising polysiloxanes ib), ic) and id) and optionally comprising polysiloxanes ia), ie) and / or if). ii. comprising 5 to 45 wt.% filler cristobalite, iii. 10 to 70 wt.% mixture, in particular premix, comprising at least two addition-curing agents linear polysiloxanes containing terminal ethylene groups, in particular comprising polysiloxanes ie), and an inorganic filler whose surface has at least hydrocarbon groups, as well as iv. 0 to 15 wt.% at least one additive(s), pigment(s) and / or dye(s), v. 4 to 30 wt.% polysiloxanes containing at least two Si-H groups and vi. 0 to 10 wt.% opacifying agent, in particular titanium dioxide, where the total composition B comprises 100 wt.%.

16. Composition, in particular dental composition, comprising KDP12312WO 17 March 2026 - Linear polysiloxanes containing at least two terminal ethylene groups and offering 15 to 60 wt% addition crosslinking properties, - comprising 5 to 45 wt.% filler cristobalite, -2 to 75 wt.%, in particular 10 to 70 wt.% mixture, in particular premix, comprising addition-crosslinking linear polysiloxanes containing at least two terminal ethylene groups and an inorganic filler whose surface has hydrocarbon groups, as well as -0 to 15 wt% at least one additive(s), pigment(s) and / or dye(s), and -0 to 3 wt%, in particular 0.001 to 0.5 wt% comprising a hydrosilylation catalyst, and -0 to 10 wt% opacifying agent, in particular titanium dioxide, - Polysiloxanes containing at least two Si-H groups in 0.5 to 30 wt.%, in particular wherein the composition as a total composition is 100 wt.% as a mixture of a. composition A and b. composition B according to any one of claims 1 to 15.

17. Composition according to one of claims 1 to 16, characterized in that the additive comprises at least one surfactant comprising a polyether, polyether-functionalized siloxane oligomer, fatty alcohol and / or fluorinated surfactant or mixtures of the aforementioned surfactants.

18. Composition according to one of claims 1 to 17, characterized in that the addition-crosslinking polysiloxanes containing at least two terminal ethylene groups have an ethylene group content of 0.02 mmol / g to 1 mmol / g ethylene groups, in particular vinyl groups.

19. Composition according to any one of claims 1 to 18, characterized in that the polysiloxanes containing Si-H groups have a Si-H group content of 1 to 8.0 mmol / g, preferably a Si-H group content of 1.0 to 6 mmol / g.

20. Composition according to any one of claims 1 to 19, characterized in that the molar ratio of Si-H groups of the polysiloxanes to ethylene groups of the polysiloxanes in the composition is 8 : 1 to 1 : 1, in particular 4 : 1 to 2 : 1, optionally comprising a hydrosilylation catalyst.

21. Polymerized composition obtainable by mixing composition A and composition B according to any one of claims 1 to 20, KDP12312WO 17 March 2026 characterized by the fact that The composition A and composition B are mixed in a weight ratio of 5 : 1 to 1 : 5, in particular of 2 : 1 to 1 : 2, particularly preferably of 1 : 1, especially with + / - 15 %, wherein the polymerized composition preferably has a Shore A hardness (10 min) of greater than or equal to 30 to 50, and / or a tensile strength of greater than or equal to 2 [N / mm²]. 2 ] and / or in particular with a tensile energy of greater than or equal to 300 [Nmm], preferably greater than or equal to 500, particularly preferably greater than or equal to 600, or greater than or equal to 700 or greater than or equal to 800, and / or a tensile strength of greater than or equal to 3.0 [N / mm] 2 ] exhibits, preferably greater than or equal to 3.5 [N / mm²] 2 ].

22. Kit comprising a 2K dispensing device comprising at least one cartridge with two chambers or two cartridges with one chamber each, wherein in one chamber of the cartridge with two chambers or a cartridge with one chamber each the i) composition A according to one of claims 1 to 21 is present and in another chamber of the cartridge with two chambers or another cartridge with one chamber each the ii) composition B according to one of claims 1 to 21 is present.

23. Use of a composition according to any one of claims 1 to 21 or of a kit according to claim 22 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), oral impressions, podiatry, 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, in particular in Semiconductor sector.

Images