Organopolysiloxane composition with filler

Abstract

The present invention relates to a composition comprising a first polyorganosiloxane functionalized with a relatively high concentration of DH groups; a second polyorganosiloxane functionalized with an OH group or an ethylenically unsaturated group; a foaming agent; a filler; and a hydrosilylation catalyst. The compositions of the present invention are useful in the preparation of low density high filler content foams that can be used as thermal barriers.

Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to an organopolysiloxane composition having a relatively high filler content. The composition can be used as a precursor for a low density, high filler content foam for thermal barrier applications.

[0002] Polyorganosiloxane foams such as polydimethylsiloxane (PDMS) foams provide lower density and higher compressibility than the corresponding rigid materials. Filled PDMS foams can provide additional beneficial effects such as flame retardancy, targeted (high or low) thermal conductivity, and more robust mechanical properties. Filled foams can be used as thermal barriers for rechargeable batteries such as lithium ion batteries (LiBs), which are commonly used in various applications including electric vehicles (EVs). Although LiBs have desirable properties of high energy density and cycle stability, safety concerns currently limit their usefulness. First, failures of LiB batteries can be triggered by manufacturing defects, internal short circuits, overheating, overcharging, or mechanical shock; second, heat generated from a failed battery can spread, leading to thermal runaway in adjacent batteries. The rapid pressure buildup caused by these thermal events increases the risk of fire and explosion.

[0003] Thermal events can be mitigated by placing a thermal barrier between the batteries in a battery module, which provides thermal insulation and flame retardancy. Commonly used thermal barriers such as aerogels, ceramic fibers, and mica sheets provide such properties; however, aerogels and ceramic fibers have poor mechanical resilience, while mica sheets are incompressible. On the other hand, although silicone foamed foams provide sufficient compressibility and are thus suitable for low energy density and medium energy density batteries, their thermal insulation is insufficient to prevent thermal events for very high energy density battery packs. Adding filler particles to the foam will overcome this defect; however, the presence of the available levels of filler unfavorably increases the density of the foam.

[0004] Therefore, in the field of thermal barriers, it would be advantageous to find a low density insulating barrier having desired thermal properties, flame retardancy, and other mechanical properties such as high modulus and greater mechanical strength. SUMMARY OF THE INVENTION

[0005] In one aspect, the present invention addresses the needs in the art by providing a composition comprising:

[0006] a) 2 wt% to 50 wt% of a first polyorganosiloxane having a degree of polymerization in the range of 5 to 200 and a D H concentration in the range of 60 mol% to 100 mol%;

[0007] b) from 10 wt% to 90 wt% of a second polyorganosiloxane functionalized with at least two groups selected from the group consisting of ethylenically unsaturated groups, OH groups, or combinations thereof; and the second polyorganosiloxane has a degree of polymerization in the range of 50 to 2000;

[0008] wherein the concentrations of the first polyorganosiloxane and the second polyorganosiloxane are based on the weights of the first polyorganosiloxane and the second polyorganosiloxane;

[0009] c) from 0.1 wt% to 20 wt% of a blowing agent, based on the concentrations of the first polyorganosiloxane, the second polyorganosiloxane, and the blowing agent, the blowing agent being a C1-C8 alcohol, a C1-

[0010] C8 diol, benzyl alcohol, HO-(CH2CHRO) z -H, a polyorganosiloxane functionalized with at least one OH group and having a degree of polymerization in the range of 1 to 15, or water; where R is H, methyl, or ethyl, and z is from 2 to 5;

[0011] d) from 30 wt% to 50 wt% of one or more fillers, based on the weight of the composition, wherein the one or more fillers are selected from the group consisting of metals, metal oxides, metal hydroxides, metal acetates, metal carbides, metal oxycarbides, metal carbonates and bicarbonates, metal hydroxycarbonates, metal sulfates, metal chlorides, metal nitrides, metal nitrates, metal silicides, metal silicates; and

[0012] e) a catalytic amount of a catalyst that promotes the reaction between the first polyorganosiloxane and the second polyorganosiloxane; and the reaction between the first polyorganosiloxane and the blowing agent;

[0013] wherein the molar / molar ratio of the D H groups in the first polyorganosiloxane to the ethylenically unsaturated groups and / or OH groups of the second polyorganosiloxane is in the range of 1.7:1 to 20:1.

[0014] The present invention addresses the needs in the art by providing a method for preparing polyorganosiloxane foams having a relatively low density and a relatively high filler content. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a diagram of a battery module containing a polyorganosiloxane foam material. DETAILED DESCRIPTION

[0016] In one aspect, the present invention is a composition comprising:

[0017] a) 2% to 50% by weight of a first polyorganosiloxane having a degree of polymerization in the range of 5 to 200 and a D concentration in the range of 60 mol% to 100 mol%; H Concentration;

[0018] b) 10% to 90% by weight of a second polyorganosiloxane functionalized with at least two groups selected from the group consisting of ethylenically unsaturated groups, OH groups, or combinations thereof; and the second polyorganosiloxane having a degree of polymerization in the range of 50 to 2000;

[0019] wherein the concentrations of the first polyorganosiloxane and the second polyorganosiloxane are based on the weights of the first polyorganosiloxane and the second polyorganosiloxane;

[0020] c) 0.1% to 20% by weight, based on the concentrations of the first polyorganosiloxane, the second polyorganosiloxane, and the blowing agent, of a blowing agent selected from the group consisting of C1-C8 alcohols, C1-C8 diols, benzyl alcohol, HO-(CH2CHRO)-H, a polyorganosiloxane functionalized with at least one OH group and having a degree of polymerization in the range of 1 to 15, or water; where R is H, methyl, or ethyl, and z is from 2 to 5; z -H, a polyorganosiloxane functionalized with at least one OH group and having a degree of polymerization in the range of 1 to 15, or water; where R is H, methyl, or ethyl, and z is from 2 to 5;

[0021] d) 30% to 50% by weight, based on the weight of the composition, of one or more fillers selected from the group consisting of metals, metal oxides, metal hydroxides, metal acetates, metal carbides, metal oxycarbides, metal carbonates and bicarbonates, metal hydroxycarbonates, metal sulfates, metal chlorides, metal nitrides, metal nitrates, metal silicides, and metal silicates; and

[0022] e) a catalytic amount of a catalyst that promotes the reaction between the first polyorganosiloxane and the second polyorganosiloxane; and the reaction between the first polyorganosiloxane and the blowing agent;

[0023] wherein the molar / molar ratio of the D groups in the first polyorganosiloxane to the ethylenically unsaturated groups and / or OH groups of the second polyorganosiloxane is in the range of 1.7:1 to 20:1. H groups and the ethylenically unsaturated groups and / or OH groups of the second polyorganosiloxane is in the range of 1.7:1 to 20:1.

[0024] The first polyorganosiloxane is represented by Structure I:

[0025]

[0026] where m is from 0 to 80, and n is from 5 to 200 or to 100, provided that the ratio of m:n is in the range of 0:100 to 40:60, preferably to 36:64. Thus, D HThe concentration ranges from 60 mol% or 64 mol% to 100 mol%. It should be understood that the first polyorganosiloxane can be a weighted average D H One or more polyorganosiloxanes having a concentration in the range of 60 mol% or 64 mol% to 100 mol%. It should also be understood that D and D H groups are distributed in a random, block or alternating manner.

[0027] The second polyorganosiloxane is at least one polyorganosiloxane functionalized with one or more OH groups or one or more ethylenically unsaturated groups or a combination of OH and ethylenically unsaturated groups. Preferably, the degree of polymerization of the second polyorganosiloxane ranges from 100 to 1000.

[0028] The second polyorganosiloxane may also contain a polyorganosiloxane resin functionalized with one or more OH groups or one or more ethylenically unsaturated groups or a combination of OH and ethylenically unsaturated groups. The polyorganosiloxane resin contains SiO 3 / 2 units or SiO 4 / 2 units or both, as shown:

[0029]

[0030] where R o is methyl, ethyl or phenyl, and the dashed line represents the point of attachment to other groups. Examples of preferred second polyorganosiloxanes include divinyl polydimethylsiloxane, vinyl-substituted polyorganosiloxane resin and dihydroxy polydimethylsiloxane resin and combinations thereof. The catalyst is preferably a platinum-based catalyst such as chloroplatinic acid and is used in a catalytic amount, typically in the range of 0.5 ppm to 200 ppm of Pt based on the weight of the composition.

[0031] The molar / molar ratio of the D H groups in the first polyorganosiloxane to the hydroxyl and / or ethylenically unsaturated groups in the second polyorganosiloxane ranges from 1.7:1 or 1.9:1 or 3:1 or 5:1 to 20:1 or to 15:1 or to 10:1. Preferably, the second polyorganosiloxane contains ethylenically unsaturated groups, more preferably two vinyl groups.

[0032] The blowing agent reacts with the Si-H groups in the presence of the Pt catalyst to generate H2 gas. Thus, the blowing agent can be a C1-C8-alcohol, a C1-C8-diol, benzyl alcohol or HO-(CH2CHRO) z -H, where R is H, methyl or ethyl, and z is from 2 to 5; or the blowing agent can be water. Examples of blowing agents include benzyl alcohol, ethanol, propanol and 1,4-butanediol.

[0033] The filler is a metal, metal oxide, metal hydroxide, metal acetate, metal carbide, metal carbon oxide, metal carbonate and bicarbonate, metal hydroxycarbonate, metal sulfate, metal chloride, metal nitride, metal nitrate, metal silicide, metal silicate, and their hydrates, and mixtures thereof. The filler is in particulate form and typically has an average volume particle size in the range of 0.1 μm or 0.5 μm or 1 μm to 1000 μm or to 500 μm or to 200 μm or to 100 μm or to 50 μm, as determined using a dynamic light scattering analyzer such as a Beckman Coulter LS130 particle size analyzer.

[0034] Examples of suitable fillers include aluminum hydroxide, hydromagnesite, epsomite, nesquihonite, boehmite, dolomite, magnesium hydroxide, silica, silica flour, alumina, calcium sulfate, copper acetate, magnesium chloride, sodium sulfate, aluminosilicate, boron nitride, aluminum nitride, mica, wollastonite, calcium silicate, basalt, clay (including calcined clay), zeolite, hollow fillers (such as hollow glass spheres and hollow ceramics), expanded perlite, calcium carbonate, cerium oxide, iron oxide, titanium oxide, zinc oxide, and glass fiber, and hydrates of these fillers.

[0035] It may be desirable to use a combination of fillers at a high loading to achieve desired properties such as improved fire resistance and mechanical strength at high temperatures. A particularly desirable filler combination is aluminum hydroxide and wollastonite. Based on the weight of the composition, the concentration of the filler is in the range of 30 wt%, preferably 35 wt% to 50 wt%, preferably to 45 wt%.

[0036] The composition is advantageously prepared as a two - part system. More specifically, the Pt catalyst is separated from the first polyorganosiloxane to prevent premature reaction of the first polyorganosiloxane with the second polyorganosiloxane and the blowing agent. In a preferred method of preparing the composition of the present invention, a first portion of the second polyorganosiloxane, the Pt catalyst, and the blowing agent are mixed in a first chamber. Then, with further mixing, a first portion of the filler is added to the contents of the first chamber. In a second container, the first polyorganosiloxane is mixed with a second portion of the second polyorganosiloxane, and then a second portion of the filler is added and further mixed. Advantageously, the filler is included in each chamber to enhance the mixing of the two parts. The two parts are each dispensed through a dispenser, which is typically a dual - component cartridge equipped with a static mixer, and then dispensed onto the desired substrate or target area. After the first polyorganosiloxane contacts the second polyorganosiloxane and the blowing agent, the reaction caused by the release of hydrogen and the accompanying foaming begins. The foam advantageously cures at an elevated temperature, preferably at least 80 °C or at least 100 °C, and preferably up to 200 °C or up to 150 °C.

[0037] The resulting foam contains the remainder of the blowing agent and the remainder of the second polyorganosiloxane. The remainder of the blowing agent is the reaction product of the Si-H groups from the first polyorganosiloxane with one or more OH groups of the blowing agent:

[0038]

[0039] wherein R-Si-H is the first organopolysiloxane, R'-OH is the blowing agent, and O-R' is the remainder of the blowing agent.

[0040] Similarly, the remainder of the second polyorganosiloxane is the reaction product of the Si-H groups from the first polyorganosiloxane with the OH and / or ethylenically unsaturated groups of the second polyorganosiloxane. When the second polyorganosiloxane contains two ethylenically unsaturated groups, the remainder results from the following reaction:

[0041]

[0042] wherein =-R”-Si is the second polyorganosiloxane, and CH2CH2-R” is the remainder of the second polyorganosiloxane.

[0043] Surprisingly, the foam produced from the composition of the present invention has a high filler loading (30 wt% to 50 wt%) and a foam density in the range of 0.20 g / cm 3 or 0.25 g / cm 3 to 0.60 g / cm 3 or to 0.52 g / cm 3 or to 0.40 g / cm 3 Thus, in another aspect, the present invention is a polyorganosiloxane foam that is dispersed with 30 wt% to 50 wt% of filler particles based on the weight of the foam and the filler particles, wherein the foam is further characterized by containing: i) structural units of Si-H groups and a blowing agent; and ii) structural units of Si-H groups and OH groups and / or ethylenically unsaturated groups, wherein the ratio of i:ii is in the range of 1.7:1 to 20:1 or to 15:1.

[0044] The foam can be used as a barrier material for battery module applications. In another aspect, the present invention is a battery module that includes a housing accommodating an array of battery cells separated in space and the composition of the present invention in contact with adjacent battery cells.

[0045] Figure 1This represents an embodiment of the present invention. The battery module includes a housing (20) that houses an array of battery cells (30 and 30a) separated in accommodation space and a barrier material (40) that contacts adjacent battery cells, thereby creating an insulating barrier between the battery cells (30 and 30a). In this embodiment, the barrier material is positioned between adjacent battery cells (30 and 30a); in another embodiment, the barrier material covers the battery cells. The battery module may also include an end plate (50) at the inner edge of the housing, which directly contacts the battery cells (not shown) or indirectly contacts the battery cells (30a) through the barrier material (40). The barrier material can be inserted into the space between adjacent battery cells and the space between the cells and the end plate; alternatively, a foam precursor can be applied to the cells and into the space between the battery cells, and then cured to form the barrier material. Examples of suitable battery cell designs include cylindrical, pouch, and prismatic cells.

[0046] Example

[0047] In the following examples, pbw refers to parts by weight. All components were mixed at 2000 rpm using a Flacktex Speed Mixer.

[0048] Comparative Intermediate Example 1 - Preparation of a 2 - part composition without filler

[0049] The first component (Part A) was prepared by mixing the following substances, blended at 64:36 w / w, for 30 seconds: 1) dimethylvinylsilanyloxy-terminated polydimethylsiloxane, having a viscosity of ∼1,900 mPa·s and 0.22 wt% vinyl groups; and 2) ViMe2SiO 1 / 2 / (CH3)3Si - O 1 / 2 / SiO 4 / 2 resin, ViMe2SiO 1 / 2 :(CH3)3Si - O 1 / 2 :SiO 4 / 2 structural unit ratio of 5:40:55, M n is 5000 and M w is 21,400 (polymer - resin blend, 78.11 pbw); and b) dimethylvinylsilanyloxy-terminated polydimethylsiloxane with a viscosity of 40,000 mPa·s (Polymer 1, 13.63 pbw). A complex of Pt(0) and divinyltetramethyldisiloxane (1.13 pbw, 0.62 pbw Pt), 1,4 - butanediol (3.14 pbw), and benzyl alcohol (4 pbw) were added to the mixture and mixing was continued for an additional 30 seconds.

[0050] The second component (Part B) was prepared by mixing a polymer-resin blend (64.36 pbw) and Polymer 1 (11.23 pbw) for 30 seconds. MD H 79.31 The linear organohydrogenpolysiloxane of MD 3.2 D H 5.8 M (Polymer 2, 17.95 pbw) and the polydimethylorganohydrogensiloxane of MD

[0051] Comparative Intermediate Example 2 - Preparation of a filler-containing composition with a Si-H:vinyl ratio of 6.23:1 and a D H mole % of 31.8% 2 - part composition

[0052] M (Polymer 3, 6.46 pbw) were added to the mixture, and mixing was continued for an additional 30 seconds.

[0053] The first component (Part A) was prepared by mixing a polymer-resin blend (46.06 pbw), Polymer 1 (8.04 pbw), and Micral 855 aluminum hydroxide (10.8 pbw) for 30 seconds. Then a complex of Pt(0) and divinyltetramethyldisiloxane (0.66 wt%, 0.62 wt% Pt), 1,4-butanediol (1.85 pbw), and benzyl alcohol (2.36 pbw) were added to the mixture, and mixing was continued for 30 seconds. Imerys Nyad G wollastonite (30.23 pbw) was added to the mixture, and mixing was continued for an additional 30 seconds.

[0053] Part B was prepared by mixing a polymer resin blend (20.11 pbw), Polymer 1 (3.51 pbw), and Hymod M855 aluminum hydroxide (10.41 pbw) for 30 seconds, then adding Polymer 3 (2.02 pbw) and the linear organohydrogenpolysiloxane of MD 8.7 D H 3.7 M (Polymer 4, 33.72 pbw). Mixing was continued for 30 seconds, after which Imerys Nyad G wollastonite (30.23 pbw) was added to the mixture, and mixing was continued for an additional 30 seconds.

[0054] Comparative Intermediate Example 3 - Preparation of a filler-containing composition with a Si-H:vinyl ratio of 1.48:1 and D H at 21.5% 2 - part composition 。

[0055] The first component (Part A) was prepared by mixing a polymer-resin blend (18.75 pbw) and dimethylvinylsilanyloxy-terminated polydimethylsiloxane with a viscosity of ~2,200 mPa·s (Polymer 5, 50.9 pbw) for 30 seconds. A complex of Pt(0) and divinyltetramethyldisiloxane (0.64 pbw, 0.62 pbw Pt) and benzyl alcohol (7.72 pbw) were added to the mixture. The contents were mixed for 30 seconds, after which Imerys Nyad G wollastonite (14.39 pbw) and Minusil 5 silica (5 μm, 7.6 pbw) were added to the mixture and mixing was continued for an additional 30 seconds.

[0056] Part B was prepared by mixing a polymer resin blend (18.75 pbw) and Polymer 5 (47.58 pbw) for 30 seconds. Polymer 4 (6.68 pbw) and MD 60 D H 7M linear organohydrogenpolysiloxane (Polymer 6, 5 pbw) were added to the mixture and the contents were mixed at 2000 rpm for 30 seconds. Then, Imerys Nyad G wollastonite (14.39 pbw) and Minusil 5 silica (5 μm, 7.6 pbw) were added to the mixture and mixing was continued for an additional 30 seconds.

[0057] Intermediate Example 1 - Preparation of a filler-containing material with an Si-H:vinyl ratio of 1.94:1 and a D H of 90.6% for 2 Part composition

[0058] The first component (Part A) was prepared by mixing a polymer-resin blend (45.53 pbw), Polymer 1 (7.94 pbw) and Micral 855 aluminum hydroxide (10.68 pbw) for 30 seconds. Then a complex of Pt(0) and divinyltetramethyldisiloxane (0.66 pbw, 0.62 pbw Pt), 1,4-butanediol (1.82 pbw) and benzyl alcohol (2.33 pbw) were added to the mixture and mixing was continued for 30 seconds. Imerys Nyad G wollastonite (31.03 pbw) was added to the mixture and mixing was continued for an additional 30 seconds.

[0059] The second composition (Part B) was prepared by mixing a polymer resin blend (48.27 pbw), Polymer 1 (3.91 pbw) and Hymod M855 aluminum hydroxide (11.59 pbw) for 30 seconds. Then Polymer 2 (2.93 pbw) and Polymer 3 (2.25 pbw) were added to the mixture and the contents were mixed for 30 seconds. Imerys Nyad G wollastonite (31.03 pbw) was added to the mixture and mixing was continued for an additional 30 seconds.

[0060] Table 1 is a summary of the Part A and Part B formulations, in pbw. PRB refers to the polymer-resin blend; P1-P6 refer to polymers 1-6; BDO refers to 1,4-butanediol; BzOH refers to benzyl alcohol; Pt refers to the Pt(0) complex; F1 refers to the Micral 855 ATH filler; F2 refers to the Hymod M855-SP filler; F3 refers to the Nyad G wollastonite filler; F4 refers to the Minusil 5 silica.

[0061] Table 1 - Part A and Part B formulations

[0062]

[0063] Table 2 shows additional Part A and Part B formulations used to prepare the compositions of the present invention. F5 refers to Mica WG-325 Muscovite mica.

[0064] Table 2 - Part A and Part B formulations (continued)

[0065]

[0066] Manufacture of foam sheet

[0067] All foam sheets were manufactured using the following procedure. Part A and Part B were mixed completely for 15 seconds. The mixture was then poured between two matte polyester film sheets. The initial (pre-foam) thickness was controlled to 0.045” using a roller. The sample was then transferred to an oven set at 120 °C. After 2 minutes, the release sheets were removed and the sample was cured continuously at 120 °C. The foam density was calculated based on the average thickness and weight of two foam samples with a diameter of 1 inch (2.54 cm).

[0068] Table 3 shows the calculated D H mole % (D H % = D H m / (D H m + D n )), the D when the blends of Part A and Part B are mixed H ratio of the D H groups to vinyl groups (D 3 : vinyl), the filler concentration (filler %), the foam density in g / cm

[0069] Table 3-D H mol% and D H : Vinyl ratio

[0070] Example number <![CDATA[D H %]]> <![CDATA[D H : vinyl]]> Filler % Density Foam C1 90.6 6.13 0 0.15 NU C2 31.8 6.23 40.83 1.04 U C3 21.5 1.48 21.99 1.03 U Example 1 84.6 1.94 42.17 0.52 U Example 2 96.4 14.93 42.33 0.39 U Example 3 100 6.61 45.07 0.31 U Example 4 64.4 10.00 41.81 0.48 U Example 5 90.6 6.13 44.34 0.27 U Example 6 90.6 6.13 44.34 0.49 U

[0071] Table 3 shows that by adjusting the D H : vinyl ratio and the D H concentration, foams having a density < 0.6 g / cm 3 and a filler concentration greater than 30% can be obtained from the polyorganosiloxane composition. The data also show that low density high filler concentration foams can be achieved with a variety of filler materials. It was also surprisingly found that the foam without filler (C1) was non-uniform, resulting in poor thickness control and poor compressibility.

[0072] A relatively high ratio of Si-H groups to vinyl groups or SiOH groups, combined with a relatively high concentration of Si-H groups in the first polyorganosiloxane, results in a higher H2 gas yield and thus provides greater expansion, thereby reducing the foam density, along with a reduced crosslink density. Surprisingly, despite the higher H2 gas production, the high concentration of filler helps to produce a uniform foam.

Claims

1. A composition, the composition comprising: a) 2% to 50% by weight of a first polyorganosiloxane having a degree of polymerization in the range of 5 to 200 and a D H concentration in the range of 60 mol% to 100 mol%; b) 10% to 90% by weight of a second polyorganosiloxane functionalized with at least two groups, the at least two groups being ethylenically unsaturated groups or OH groups or a combination thereof; and the second polyorganosiloxane having a degree of polymerization in the range of 50 to 2000; wherein the concentrations of the first polyorganosiloxane and the second polyorganosiloxane are based on the weights of the first polyorganosiloxane and the second polyorganosiloxane; c) 0.1% to 20% by weight of the blowing agent, based on the concentrations of the first polyorganosiloxane, the second polyorganosiloxane and the blowing agent, the blowing agent being a C1-C8-alcohol, a C1-C8-diol, benzyl alcohol, HO-(CH2CHRO) z -H, a polyorganosiloxane functionalized with at least one OH group and having a degree of polymerization in the range of 1 to 15, or water; wherein R is H, methyl or ethyl, and z is 2 to 5; d) 30% to 50% by weight of one or more fillers, based on the weight of the composition, wherein the one or more fillers are selected from the group consisting of: metals, metal oxides, metal hydroxides, metal acetates, metal carbides, metal oxycarbides, metal carbonates and bicarbonates, metal hydroxycarbonates, metal sulfates, metal chlorides, metal nitrides, metal nitrates, metal silicides, metal silicates; and e) a catalytic amount of a catalyst that promotes the reaction between the first polyorganosiloxane and the second polyorganosiloxane; and the reaction between the first polyorganosiloxane and the blowing agent; wherein the molar / molar ratio of the D H groups in the first polyorganosiloxane to the ethylenically unsaturated groups and / or OH groups of the second polyorganosiloxane is in the range of 1.7:1 to 20:

1.

2. The composition according to claim 1, wherein the first polyorganosiloxane has a degree of polymerization in the range of 5 to 100 and a D H concentration in the range of 64 mol% to 100 mol%; and the molar / molar ratio of the D H groups in the first polyorganosiloxane to the ethylenically unsaturated groups and / or OH groups in the second polyorganosiloxane is in the range of 1.7:1 to 15:

1.

3. The composition according to claim 2, wherein the second polyorganosiloxane is one or more polyorganosiloxanes functionalized with two ethylenically unsaturated groups.

4. The composition according to claim 3, wherein the ethylenically unsaturated group is a vinyl group; wherein the blowing agent is a C1-C8-alcohol, a C1-C8-diol or benzyl alcohol or a combination thereof; and wherein the filler is one or more fillers selected from the group consisting of: aluminum hydroxide, hydromagnesite, epsomite, nesquehonite, boehmite, dolomite, magnesium hydroxide, silica, quartz powder, alumina, calcium sulfate, copper acetate, magnesium chloride, sodium sulfate, aluminosilicate, boron nitride, aluminum nitride, mica, wollastonite, calcium silicate, basalt, clay, zeolite, hollow glass spheres, hollow ceramics, expanded perlite, calcium carbonate, cerium oxide, iron oxide, titanium oxide, zinc oxide and glass fiber; and the catalyst is a platinum catalyst.

5. The composition according to claim 4, wherein the second polyorganosiloxane further comprises a vinyl-substituted polyorganosiloxane resin.

6. The composition according to claim 5, wherein based on the total weight of the composition and the filler, the concentration of the filler is in the range of 35 wt% to 55 wt%; the blowing agent is benzyl alcohol or 1,4-butanediol or a combination thereof; and the filler is a combination of wollastonite and aluminum hydroxide.

7. The composition according to claim 3, wherein the D H groups in the first polyorganosiloxane and the ethylenically unsaturated groups in the second polyorganosiloxane have a molar / molar ratio in the range of 3:1 to 10:1; the blowing agent is benzyl alcohol or 1,4-butanediol or a combination thereof; and the filler is a combination of wollastonite and aluminum hydroxide; wherein the second polyorganosiloxane comprises divinylpolymethylsiloxane and divinylpolymethylsiloxane resin.

8. The composition according to claim 6, wherein the D H groups in the first polyorganosiloxane and the ethylenically unsaturated groups in the second polyorganosiloxane have a molar / molar ratio in the range of 3:1 to 10:1; the blowing agent is benzyl alcohol or 1,4-butanediol; and the filler is a combination of wollastonite and aluminum hydroxide.

9. The composition according to claim 2, wherein the second polyorganosiloxane is functionalized with one ethylenically unsaturated group and one OH group or with two OH groups.

10. The composition according to claim 1, wherein components a), b), c) and d) react to form a foam having a density in the range of 0.20 g / cm 3 to 0.60 g / cm 3 range.

11. The composition according to claim 10, wherein the foam has a density in the range of 0.25 g / cm 3 to 0.52 g / cm 3 and a filler concentration in the range of 35 wt% to 55 wt% based on the weight of the foam and the filler.

12. A battery module, the battery module comprising a housing that houses an array of battery cells separated in accommodation space and the composition according to any one of claims 1 to 8 that contacts adjacent battery cells.

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