Thermally conductive injection-moulding material

Abstract

The invention relates to thermally conductive injection-moulding material (1) which is able to be processed in an injection-moulding process, comprising a matrix (2.1) of at least one thermoplastic elastomer, wherein the matrix (2.1) contains thermally conductive particles (2.2).

Description

[0001] Thermally conductive injection molding material

[0002] The invention relates to a thermally conductive injection molding material comprising a matrix of at least one thermoplastic material, wherein the matrix contains thermally conductive particles.

[0003] Corresponding thermally conductive injection molding materials are generally characterized by a thermoplastic matrix containing thermally conductive particles and are basically known from the prior art in various embodiments.

[0004] Corresponding thermally conductive injection molding materials are typically available as granules that can be processed in an injection molding process. Processing of corresponding injection molding materials typically involves melting the respective injection molding material, thus converting the respective injection molding material into a molten mass, and injecting the molten mass into a molding cavity of an injection mold.

[0005] A component or component assembly may already be present in the molding cavity of the injection mold, onto which the molten mass is injected, at least in part, or overmolded, at least in part, with the molten mass. The purpose of overmolded or overmolded molding may, in particular, be to dissipate heat generated during operation of the component or component assembly via the injection molding material. This can be particularly the case with electrical or electronic components or component assemblies.

[0006] Known thermally conductive injection molding materials require improvement or further development, particularly with regard to their thermal properties, in particular their thermal conductivity, which is typically (only) approximately 0.1 W / mK.

[0007] In addition, there is a need for improvement or further development of known thermally conductive injection molding materials with regard to the ability to adapt to as many different, possibly complex, geometries as possible of a respective component or a respective component arrangement in order to ensure the best possible thermal contact between the component or the component arrangement and the injection molding material or the thermally conductive plastic body formed therefrom and thus the best possible dissipation of thermal energy through the injection molding material or the thermally conductive plastic body formed thereby.

[0008] Based on this, the present invention is based on the object of providing an improved thermally conductive injection molding material. The invention is achieved in particular by a thermally conductive injection molding material according to independent claim 1. The dependent claims relate to possible embodiments of the thermally conductive injection molding material according to independent claim 1.

[0009] A first aspect of the invention relates to a thermally conductive injection molding material (hereinafter, the term "injection molding material" is used alone). The term "injection molding material" indicates the property of the injection molding material to be processed in an injection molding process. The processability of the injection molding material in an injection molding process implies, in particular, that the injection molding material can be converted into a molten mass (melt) by heating, which can be injected into a shaping cavity of an injection mold. The injection molding material, at least before it has been processed in an injection molding process, is typically in the form of granules, which is why the injection molding material can also be referred to or considered as injection molding granules.

[0010] The injection molding material is thermally conductive and therefore has thermally conductive properties which, as will be seen below, result in particular from a proportion of thermally conductive particles distributed in a thermoplastic matrix.

[0011] The injection molding material therefore has a thermoplastic matrix. The special feature of the matrix of the injection molding material is that it is not made of a conventional thermoplastic, but of a thermoplastic elastomer, or TPE for short. The injection molding material therefore has a matrix made of a thermoplastic elastomer. Thermoplastic elastomers have different properties than conventional thermoplastics due to their chemical-physical structure, i.e. in particular the presence of physical crosslinking points. In particular, thermoplastic elastomers are characterized by a lower hardness and thus a higher softness compared to conventional thermoplastics due to their chemical-physical structure. This forms the basis for the injection molding material's ability to adapt to a wide variety of, possibly complex,To adapt to the geometries and / or unevenness of a component or component arrangement, onto which the (molten) injection molding material is injected, at least in sections, during an injection molding process, or which is at least partially overmolded by the (molten) injection molding material during an injection molding process. Due to the properties of the thermoplastic elastomer forming the matrix, the injection molding material thus provides the best possible thermal contact between the component or component arrangement and the injection molding material, or the thermally conductive plastic body formed therefrom after cooling and solidification, and thus to ensure the best possible dissipation of thermal energy through the injection molding material, or the thermally conductive plastic body formed thereby. In order to increase the thermal conductivity of the injection molding material,The matrix contains thermally conductive particles. The proportion of thermally conductive particles in the matrix is ​​so high that they significantly influence and essentially define the thermal conductivity of the injection molding material. Specifically, the injection molding material can have a thermal conductivity of at least 0.5 W / mK, in particular of at least 0.6 W / mK, further in particular of at least 0.7 W / mK, further in particular of at least 0.8 W / mK, further in particular of at least 0.9 W / mK, further in particular of at least 1.0 W / mK, further in particular of at least 1.1 W / mK, further in particular of at least 1.2 W / mK, further in particular of at least 1.3 W / mK, further in particular of at least 1.4 W / mK, further in particular of at least 1.5 W / mK, further in particular of at least 1.6 W / mK, further in particular of at least 1.7 W / mK, further in particular of at least 1.8 W / mK, further in particular of at least 1.9 W / mK,further in particular of at least 2.0 W / mK, further in particular of at least 2.1 W / mK, further in particular of at least 2.2 W / mK, further in particular of at least 2.3 W / mK, further in particular of at least 2.4 W / mK, further in particular of at least 2.5 W / mK, further in particular of at least 2.6 W / mK, further in particular of at least 2.7 W / mK, further in particular of at least 2.8 W / mK, further in particular of at least 2.9 W / mK, further in particular of at least 3.0 W / mK. The aforementioned values ​​can also define respective upper and lower limits of intervals. The proportion of thermally conductive particles in the matrix can therefore be selected to be high enough to ensure the above-listed thermal conductivities of the injection molding material. In addition, other parameters of the thermally conductive particles which influence the thermal conductivity of the injection molding material, such as e.g. B. Type, form, distribution etc., should be chosen sothat the thermal conductivities of the injection molding material listed above are met. The thermal conductivity of the injection molding material can be measured, for example, according to ASTM D5470, ASTM D7896-19, or ASTM E1225-20.

[0012] The combination of properties resulting from the composition of the injection molding material, namely softness and conformability and comparatively high thermal conductivity, results in an improved injection molding material.

[0013] The injection molding material can therefore be used in particular to form thermally conductive plastic bodies which are intended to dissipate thermal energy (heat) generated during operation of a component or component arrangement - this can be the case in particular with electrical or electronic components or component arrangements. Corresponding thermally conductive plastic bodies can be produced by injecting the (molten) injection molding material at least partially onto a respective component or component arrangement during an injection molding process, or by injecting the (molten) injection molding material at least partially around a respective component or component arrangement during an injection molding process. In all cases, at least one surface of a respective component or component arrangement isa respective component arrangement is covered with the injection molding material, so that after cooling and solidification, a thermally conductive bond is formed between the component or the component arrangement and the thermally conductive plastic body formed by cooling or solidification of the injection molding material.

[0014] In a preferred embodiment, the matrix is ​​formed by a thermoplastic elastomer based on a styrene polymer or a styrene copolymer. Corresponding thermoplastic elastomers based on a styrene polymer or a styrene copolymer exhibit a particularly high degree of adaptability and softness, which, as described, has a positive effect on the property profile of the injection-molding material.

[0015] In a particularly advantageous embodiment, the matrix is ​​formed by a thermoplastic elastomer based on a styrene-butadiene-styrene copolymer. Corresponding thermoplastic elastomers based on a styrene-butadiene-styrene copolymer (SBS) exhibit a particularly high degree of adaptability and softness, which, as described, has a positive effect on the property profile of the injection-molding material.

[0016] In a preferred embodiment, the matrix is ​​formed from styrene-ethylene-butylene-styrene, SEBS. Tests using SEBS as the matrix have shown particularly good adaptability and softness, which, as described, has a positive effect on the property profile of the injection molding material. SEBS is also characterized by a continuous service temperature in a range between -40 °C and 120 °C, so that there is no risk of the injection molding material or a thermally conductive plastic body formed from it softening in an undesirable manner at the usual operating temperatures of electrical or electronic components or component assemblies and thus possibly even becoming detached from the component or component arrangement. The possibility of dissipating thermal energy from a component or component arrangement that generates thermal energy during operationThe use of SEBS as the matrix of the injection molding material ensures the stability of a corresponding component arrangement over a wide temperature range. Further advantageous properties of SEBS are its mechanical stability and weather resistance, which makes the use of corresponding thermally conductive plastic bodies conceivable in various weather conditions.

[0017] The hardness or softness of the injection molding material or of a thermally conductive plastic body formed from it can, in all embodiments, be in a range between 10 and 80 Shore A, in particular between 15 and 70 Shore A, furthermore in particular between 15 and 60 Shore A, furthermore in particular between 15 and 50 Shore A, furthermore in particular between 15 and 40 Shore A, furthermore in particular between 15 and 30 Shore A. The hardness of the injection molding material or of a thermally conductive plastic body formed from it can be adjusted in particular by the type, proportion, and distribution of respective thermally conductive particles. The Shore A hardness can, for example, be measured according to the ASTM D 2240 standard. The thermally conductive particles can, in particular, be metal particles and / or metal oxide particles. The matrix of the injection molding material can therefore contain metal particles and / or metal oxide particles.Thus, the injection molding material may contain thermally conductive particles formed by or comprising metal and / or metal oxide particles.

[0018] In a suitable embodiment, the thermally conductive particles are aluminum particles, aluminum oxide (Al2O3) particles, aluminum hydroxide (Al(OH)3) particles, or mixtures of at least two of the aforementioned. The matrix of the injection-molding material may thus contain aluminum particles and / or aluminum oxide particles and / or aluminum hydroxide particles, or mixtures of at least two of the aforementioned. Consequently, the injection-molding material may contain thermally conductive particles that are or comprise aluminum particles, aluminum oxide particles, aluminum hydroxide particles, or mixtures of at least two of the aforementioned. The aluminum particles, aluminum oxide (Al(OH)3) particles, or aluminum hydroxide (Al(OH)3) particles may, for example, have a round or spherical geometry or basic shape. Alternatively or additionally, platelet-like or platelet-shaped geometries or basic shapes are conceivable.

[0019] In an alternative or additional embodiment, the thermally conductive particles can be titanium particles, titanium oxide (TiO, TiO2 or Ti2O3) particles, titanium hydroxide particles, or mixtures of at least two of the aforementioned. Accordingly, the matrix of the injection-molding material can contain titanium particles and / or titanium oxide particles and / or titanium hydroxide particles, or mixtures of at least two of the aforementioned. Consequently, the injection-molding material can contain thermally conductive particles that are or comprise titanium particles, titanium oxide particles, titanium hydroxide particles, or mixtures of at least two of the aforementioned. The titanium particles, titanium oxide (TiO, TiO2 or Ti2O3) particles, titanium hydroxide particles can, for example, have a round or spherical geometry or basic shape. Alternatively or additionally, platelet-like or platelet-shaped geometries or basic shapes are fundamentally conceivable.

[0020] In an alternative or additional embodiment, the thermally conductive particles can be zirconium particles, zirconium oxide (ZrO2) particles, zirconium hydroxide (Zr(OH)4) particles, or mixtures of at least two of the aforementioned. The matrix of the injection-molding material can thus contain zirconium particles and / or zirconium oxide particles and / or zirconium hydroxide particles, or mixtures of at least two of the aforementioned. Consequently, the injection-molding material can contain thermally conductive particles that are or comprise zirconium particles, zirconium oxide particles, zirconium hydroxide particles, or mixtures of at least two of the aforementioned. The zirconium particles, zirconium oxide (ZrO2) particles, zirconium hydroxide (Zr(OH)4) particles can, for example, have a round or spherical geometry or basic shape. Alternatively or additionally, platelet-like or platelet-shaped geometries or basic shapes are fundamentally conceivable.In an alternative or additional embodiment, the thermally conductive particles can be magnesium particles, magnesium oxide (MgO) particles, magnesium hydroxide (Mg(OH)2) particles, or mixtures of at least two of the aforementioned. Accordingly, the matrix of the injection-molding material can contain magnesium particles and / or magnesium oxide particles and / or magnesium hydroxide particles, or mixtures of at least two of the aforementioned. Thus, the injection-molding material can contain thermally conductive particles that are or comprise magnesium particles, magnesium oxide particles, magnesium hydroxide particles, or mixtures of at least two of the aforementioned. The magnesium particles, magnesium oxide (MgO) particles, or magnesium hydroxide (Mg(OH)2) particles can, for example, have a round or spherical geometry or basic shape. Alternatively or additionally, platelet-like or platelet-shaped geometries or basic shapes are conceivable.

[0021] In an alternative or additional embodiment, the thermally conductive particles can be iron particles, iron oxide (Fe2O3 or FesO^ particles), iron hydroxide (Fe(OH)3) particles, or mixtures of at least two of the aforementioned. The matrix of the injection molding material can therefore contain iron particles and / or iron oxide particles and / or iron hydroxide particles or mixtures of at least two of the aforementioned. The injection molding material can therefore contain thermally conductive particles that are or comprise iron particles, iron oxide particles, iron hydroxide particles, or mixtures of at least two of the aforementioned. Ferrites or ferritic compounds are therefore also particularly suitable. The iron particles, iron oxide (Fe2O3 or FesO^ particles), iron hydroxide (Fe(OH)3) particles can, for example, have a round or spherical geometry or basic shape. In principle, platelet-like or-shaped geometries or basic shapes.

[0022] In an alternative or additional embodiment, the thermally conductive particles can be nitride-based particles, i.e., boron nitride particles. Nitride-based particles, in particular boron nitride particles, can thus be contained in the matrix of the injection-molding material. Thus, the injection-molding material can be thermally conductive. The nitride-based particles, in particular the boron nitride particles, can, for example, have a round or spherical geometry or basic shape. Alternatively or additionally, platelet-like or platelet-shaped geometries or basic shapes are conceivable.

[0023] In an alternative or additional embodiment, the thermally conductive particles may be carbon-based particles, such as graphite and / or carbon black.

[0024] At least two of the above-described embodiments of thermally conductive particles can be mixed with one another. For all embodiments, the thermally conductive particles can have spherical geometries or basic shapes, i.e., spherical or ball-shaped geometries or basic shapes, or round or roundish geometries or basic shapes, or non-spherical geometries or basic shapes, such as, for example, platelet-like or platelet-shaped geometries or basic shapes. The geometry or basic shape of the thermally conductive particles and the resulting arrangement or orientation options within the matrix can influence the thermal conductivity of the injection molding material, so that the geometry or basic shape of the thermally conductive particles can be selected with regard to the desired thermal conductivity of the injection molding material.

[0025] The weight proportion of the thermally conductive particles in the matrix can - in principle independent of their chemical composition and their geometry or basic shape

[0026] - in a range between 5 and 95 wt.%. In particular, the weight

[0027] Proportion of thermally conductive particles in the matrix in a range above 5 wt.%, more particularly above 10 wt.%, more particularly above 15 wt.%, more particularly above 20 wt.%, more particularly above 25 wt.%, more particularly above 30 wt.%, more particularly above 35 wt.%, more particularly above 40 wt.%, more particularly above 45 wt.%, more particularly above 50 wt.%, more particularly above 55 wt.%, more particularly above 60 wt.%, more particularly above 65 wt.%, more particularly above 70 wt.%, more particularly above 75 wt.%, more particularly above 80 wt.%, more particularly above 85 wt.%, more particularly above 90 wt.%. The aforementioned values ​​can also define respective upper and lower limits of intervals.Investigations have shown that with a weight fraction of thermally conductive particles in the matrix in a range between 60 and 80 wt.%, in particular between 70 and 80 wt.%, both the desired thermal conductivity of the injection molding material and the desired processability of the injection molding material in an injection molding process can be achieved. Therefore, a preferred fraction of thermally conductive particles in the matrix can be approximately 75 wt.%. In particular, despite the comparatively high fraction of thermally conductive particles, sufficient flowability of the molten or plasticized injection molding material is achieved, allowing overmolding of a component.

[0028] The size of the thermally conductive particles can, in particular depending on the chemical composition, be in a range between 1 and 300 pm, in particular between 3 and 300 pm, furthermore in particular between 5 and 300 pm, furthermore in particular between 10 and 300 pm, furthermore in particular between 15 and 300 pm, furthermore in particular between 20 and 300 pm, furthermore in particular between 25 and 300 pm. The upper limit can also be 275 pm, 250 pm, 225 pm or 200 pm instead of 300 pm. It is therefore also conceivable for the size of the thermally conductive particles to be between 75 and 250 pm, furthermore in particular between 100 and 225 pm, furthermore in particular between 125 and 200 pm. For (pure) aluminum-based thermally conductive particles, the particle size can be in a range between 3 and 50 pm, especially between 3 and 30 pm. For aluminum oxide-based thermally conductive particles, the particle size can be, for example,in a range between 1 and 20 pm, in particular between 1 and 10 pm. For thermally conductive particles based on aluminum hydroxide, the particle size can, for example, be in a range between 1 and 150 pm, in particular between 1 and 100 pm. For thermally conductive particles based on other elements, such as boron or nitride (compounds), the particle size can, in particular, be in a range between 100 and 250 pm, in particular between 100 and 200 pm.

[0029] Boron- or nitride-based particles, in particular boron nitride particles, can, if present, have, for example, a platelet-like or platelet-shaped geometry or basic shape in all embodiments. Alternatively or additionally, round or rounded geometries or basic shapes are conceivable.

[0030] In all embodiments, the particle size can advantageously be selected so that the thermally conductive particles can be arranged in a kind of thermally conductive network within the matrix. The same applies to the weight fraction of the thermally conductive particles in the matrix.

[0031] The matrix of the injection-molding material can contain only one type of thermally conductive particles. However, it is also conceivable for the matrix of the injection-molding material to contain a first and at least one second type of thermally conductive particles. By mixing thermally conductive particles that differ in at least one chemical and / or physical parameter, it is possible to specifically influence the property profile of the injection-molding material, i.e., in particular, its thermal properties, and furthermore, in particular, its thermal conductivity.

[0032] In a conceivable embodiment, the matrix of the injection molding material may contain two different types of thermally conductive particles, thus containing thermally conductive particles of a first and a second type.

[0033] The weight fraction of the thermally conductive particles of the first type is in a range between 5 and 75 wt.%, and the weight fraction of the thermally conductive particles of the second type is in a range between 5 and 75 wt.%, whereby the sum of the fractions does not exceed 100 wt.%. In particular, the sum of the fractions of the thermally conductive particles of the first type and of the at least one second type is in a range between 50 and 80 wt.%, more particularly in a range between 60 and 75 wt.%.

[0034] The thermally conductive particles of the first and second types can each have a round or spherical geometry or basic shape, or a platelet-like or platelet-shaped geometry or basic shape. The thermally conductive particles of the first type can have a geometry or basic shape that corresponds to or differs from the geometry of the thermally conductive particles of the second types. Thus, the thermally conductive particles of the first and second types can each have a round or spherical geometry or basic shape, or a platelet-like or platelet-shaped geometry or basic shape. Alternatively, the thermally conductive particles of the first type can have a round or spherical geometry or basic shape, and the thermally conductive particles of the second type can have a platelet-like or platelet-shaped geometry or basic shape, or vice versa.The above applies in principle to all specific embodiments of the injection molding material and thus independently of the chemical composition of the thermally conductive particles of the first and second type.

[0035] In a specific exemplary embodiment, the thermally conductive particles of the first type can be aluminum oxide particles, in particular with a round or spherical geometry or basic shape, and the thermally conductive particles of the second type can be nitride particles, in particular boron nitride particles, in particular with a platelet-like or platelet-shaped geometry or basic shape. Corresponding nitride particles, in particular boron nitride particles, which are characterized by a comparatively high thermal conductivity and a low electrical conductivity, can not only influence the thermal conductivity of the injection molding material but also the mechanical properties of the injection molding material or of a thermally conductive plastic body formed therefrom. As mentioned, the weight fraction of the thermally conductive particles of the first type can be in a range between 5 and 75 wt.-% and the weight fraction of the thermally conductive particles of the second type is in a range between 5 and 75 wt.%, whereby the sum of the fractions does not exceed 100 wt.%. In particular, the sum of the fractions of the thermally conductive particles of the first and the at least one second type is in a range between 50 and 80 wt.%, more particularly in a range between 60 and 75 wt.%.

[0036] In addition to the melting temperature of the matrix – which is typically around 170°C for SEBS, at least – the melt volume flow rate of the injection molding material in a molten state is a significant factor for processability in an injection molding process. In a molten state, the injection molding material can have a melt volume flow rate in a range between 4 and 20 g / 10 min (at 190°C or 230°C / 2.16 kg), in particular between 5 and 15 g / 10 min (at 190°C or 230°C / 2.16 kg), further in particular between 5 and 10 g / 10 min (at 190°C or 230°C / 2.16 kg), further in particular between 5 and 7.5 g / 10 min (at 190°C or 230°C / 2.16 kg). In a specific embodiment, the injection molding material can have a melt volume flow rate of approximately 6 g / 10 min.The comparatively high melt volume flow rate enables reliable overmolding of components, even with complex geometries, and prevents fragile components or sections from being damaged during the overmolding process. The comparatively high melt volume flow rate of the injection molding material also enables good filling of the cavity of the respective injection mold and reduces the formation of flash and air inclusions. The melt volume flow rate can be measured, for example, according to DIN EN ISO 1133.

[0037] An important property for various applications or areas of use of the injection molding material or a thermally conductive plastic body formed from it – this applies particularly to electrical or electronic applications or areas of use – can be its flammability. The injection molding material can exhibit a flammability rating of Class v0 according to UL-94. The injection molding material can therefore achieve a very high rating, which provides a significant safety advantage, especially in high-temperature applications.

[0038] For various applications or areas of use of the injection molding material or a thermally conductive plastic body formed from it – this applies in particular to electrical or electronic applications or areas of use, such as rechargeable or battery applications – a specific relative temperature index, or RTI for short, is also required. The injection molding material can therefore have a relative temperature index, or RTI, of at least 80°C, in particular at least 90°C, and more particularly at least 100°C. The RTI can be determined, for example, according to UL Standard 746B.

[0039] For various applications or fields of use of the injection molding material or of a thermally conductive plastic body formed from it - this again applies in particular to electrical or electronic applications or fields of use - a particularly (low) electrical conductivity, and therefore a particular electrical resistance, is required. The injection molding material can therefore have a comparatively low electrical conductivity. The dielectric strength of the injection molding material can be at least 2.0 kV / mm, in particular at least 2.5 kV / mm, further in particular at least 3.0 kV / mm, further in particular at least 3.5 kV / mm, further in particular at least 4.0 kV / mm, further in particular at least 4.5 kV / mm, further in particular at least 5.0 kV / mm.Likewise conceivable are embodiments of the injection molding material with a dielectric strength of at least 6.0 kV / mm, in particular at least 7.0 kV / mm, further in particular at least 8.0 kV / mm, further in particular at least 9.0 kV / mm, further in particular at least 10.0 kV / mm, further in particular 11.0 kV / mm, further in particular at least 12.0 kV / mm, further in particular at least 13.0 kV / mm, further in particular at least 14.0 kV / mm, further in particular at least 15.0 kV / mm. The aforementioned values ​​can all also be regarded as upper or lower limits of an interval. The injection molding material can therefore generally and in particular be electrically insulating up to at least 2 kV. The electrical dielectric strength can, for example, be measured according to the ASTM D 149 standard.

[0040] The thermally conductive particles can have a particle size in a range between 15 and 380 pm. The particle size can vary, in particular, depending on the chemical composition of the respective thermally conductive particles. For example, aluminum-based particles with a particle size in a range between 10 and 45 pm, in particular between 15 and 35 pm, and aluminum hydroxide-based particles with a particle size in a range between 90 and 120 pm, in particular between 100 and 110 pm, have proven useful. The aforementioned values ​​apply in particular to a mixture of aluminum-based particles and aluminum hydroxide-based particles, where the former particles can be round or rounded and the latter particles can be platelet-like or platelet-shaped, or vice versa.

[0041] Aluminum-based particles with a particle size in the range between 3 and 15 pm, in particular between 3 and 10 pm, and boron nitride-based particles with a particle size in the range between 220 and 380 pm, in particular between 240 and 360 pm, have also proven suitable. The above values ​​apply in particular to a mixture of aluminum-based particles and boron nitride-based particles, where the former particles can be platelet-like or plate-shaped and the latter particles can be round or rounded, or vice versa.

[0042] The composition of the injection molding material according to a first specific embodiment can be as follows: The matrix consisting of SEBS contains approximately 30 wt.% aluminum particles with a round or spherical basic shape and approximately 45 wt.% aluminum hydroxide particles with a platelet-like or platelet-shaped basic shape. The matrix consisting of SEBS therefore makes up approximately 25 wt.% of the injection molding material. The aluminum particles can be obtained, for example, from Benda-Lutz GmbH. The aluminum hydroxide particles can be obtained, for example, from Nabaltec AG. This embodiment can also be realized with aluminum particles with a platelet-like or platelet-shaped basic shape and with aluminum hydroxide particles with a round or spherical basic shape.

[0043] The composition of the injection molding material according to a second specific embodiment can be as follows: The matrix consisting of SEBS contains approximately 30 wt.% aluminum oxide particles with a platelet-like or spherical basic shape and approximately 30 wt.% boron nitride particles with a round or spherical basic shape. The matrix consisting of SEBS therefore makes up approximately 25 wt.% of the injection molding material. The aluminum oxide particles can be obtained, for example, from Almatis GmbH, Bassermann, Huber Advanced Materials, Showa Denko, or Silbelco. The boron nitride particles can be obtained, for example, from 3M, Saint Gobain, Henze, Momentive, or Kennametal. This embodiment can also be realized with aluminum oxide particles with a round or spherical basic shape and with boron nitride particles with a platelet-like or spherical basic shape.

[0044] A second aspect of the invention relates to a method for processing an injection molding material according to the first aspect of the invention. The method comprises, in particular, the steps of melting or plasticizing the injection molding material and injecting the melted or plasticized thermally conductive injection molding material into a molding cavity of an injection mold. The method can in principle be carried out with any injection molding machine, which typically has a plasticizing unit, e.g. formed by or comprising a cylinder, for plasticizing the injection molding material and / or an injection unit, e.g. formed by or comprising a screw movably mounted within a corresponding cylinder, for injecting the plasticized injection molding material into a molding cavity of an injection mold.The method can therefore be implemented as an injection molding process in which the injection molding material is melted or plasticized and injected into a molding cavity of an injection mold.

[0045] A third aspect of the invention relates to a method for producing a component arrangement which is provided at least in sections with a thermally conductive layer formed by at least one thermally conductive plastic body 5 formed by cooling or solidifying the injection-molding material. The method comprises, in particular, the following steps: providing at least one component which generates thermal energy (heat) in at least one operating state, in particular at least one electrical or electronic component which generates heat in at least one operating state, and at least in sections over-molding the at least one component which generates heat in at least one operating state with a molten or plasticized injection-molding material according to the first aspect of the invention to form the component arrangement. The over-molding of the at least one component with the molten orplasticized injection molding material can be carried out within the framework of an injection molding process in which the injection molding material is melted or plasticized and injected into a shaping cavity of an injection molding tool in which the at least one component is arranged or held in order to be able to be overmolded at least in sections with the melted or plasticized injection molding material.

[0046] A fourth aspect of the invention relates to a component assembly that is or will be manufactured according to a method according to the third aspect of the invention. The component assembly typically consists of at least one component, e.g., an electrical and / or electronic component, and the thermally conductive plastic body that covers said component at least in sections and is formed by cooling or solidifying the injection-molding material.

[0047] The geometry of the thermally conductive plastic body is therefore at least partially modeled on the geometry of the component, so that the thermally conductive plastic body rests flatly on the surface of the component, at least in sections, which leads to good heat transfer from the component to the thermally conductive plastic body.

[0048] Specifically, the component arrangement can be an electrical or electronic control system, in particular an electrical or electronic rechargeable battery or battery control system, for a rechargeable battery or battery of a rechargeable battery-operated tool, such as a screwdriver. The component overmolded at least in sections with the injection-molding material can be a circuit board, in particular a control board, equipped with one or more electrical and / or electronic components.

[0049] In all embodiments, the geometry of the plastic body can have one or more cooling structures, such as cooling fins, and / or one or more stiffening structures, such as stiffening ribs, which can be formed in one piece or integrally with the plastic body during the injection molding process by appropriately shaping the cavity of the respective injection mold.

[0050] By injecting a corresponding thermally conductive plastic body made of the injection-moulding material onto a corresponding component - the same would generally apply to other types of attachment or fastening - the operating temperature of the respective component or the corresponding component arrangement can be reduced, which can significantly extend the service life of the component or the component arrangement.

[0051] All statements in connection with the injection molding material according to the first aspect of the invention apply analogously to the method according to the second aspect of the invention, the method according to the third aspect of the invention and to the component arrangement according to the fourth aspect of the invention and vice versa.

[0052] The invention is explained again below with reference to the exemplary embodiments shown in the figures.

[0053] Fig. 1a, 1b a schematic representation of an injection molding material according to an embodiment;

[0054] Fig. 2 is a flowchart illustrating the steps of a method according to an embodiment; and

[0055] Fig. 3 shows a component arrangement according to an embodiment.

[0056] Figs. 1a and 1b show a schematic representation of a thermally conductive injection molding material 1 (Fig. 1a) and an enlarged granule of such an injection molding material (Fig. 1b). The injection molding material 1 can be processed in an injection molding process, which in particular implies that the injection molding material 1 can be converted by heating into a molten mass (melt) that can be injected into a shaping cavity of an injection mold. The injection molding material 1, at least before it has been processed in an injection molding process, is typically in the form of granules, which is why the injection molding material 1 can also be referred to or considered as injection molding granules. The individual grains of the granules are indicated in Fig. 1 by reference numeral 2.

[0057] The injection molding material 1 is thermally conductive and therefore has thermally conductive properties which, as will become apparent below, result in particular from a proportion of thermally conductive particles 2.2 distributed in a thermoplastic matrix 2.1, as indicated in the enlarged view according to Fig. 1 b.

[0058] The injection molding material 1 therefore has a thermoplastic matrix 2.1 made of a thermoplastic elastomer, TPE for short. Due to its chemical-physical structure, i.e. in particular the presence of physical crosslinking points, the matrix 2.1 of the injection molding material 1 therefore has different properties compared to matrices made of conventional thermoplastics, such as a lower hardness and thus a higher softness, which forms the basis for the injection molding material 1 having the ability to adapt to as many different, possibly complex, geometries and / or irregularities as possible of a component 3 of a component arrangement 4, onto which(s) the (molten) injection molding material 1 is injected at least in sections during an injection molding process or which(s) is(are) at least partially encapsulated by the (molten) injection molding material 1 during an injection molding process.Due to the properties of the thermoplastic elastomer forming the matrix 2.1, the injection molding material 1 therefore offers the best possible thermal contact between the component 3 or the component arrangement 4 and the injection molding material 1 or the thermally conductive plastic body 5 formed therefrom after cooling and solidification, and thus ensures the best possible dissipation of thermal energy through the injection molding material 1 or the thermally conductive plastic body 5 formed thereby.

[0059] In order to increase the thermal conductivity of the injection molding material 1, the matrix 2.1 contains thermally conductive particles 2.2. The proportion of thermally conductive particles 2.2 in the matrix is ​​so high that they have a significant effect on the thermal conductivity of the injection molding material 1 or substantially define it. Specifically, the injection molding material 1 can have a thermal conductivity of at least 1.5 W / mK, in particular of at least 2.0 W / mK. The proportion of thermally conductive particles 2.2 in the matrix 2.1 can therefore be selected to be high enough to ensure the above-mentioned thermal conductivities of the injection molding material 1. In addition, other parameters of the thermally conductive particles 2.2 that influence the thermal conductivity of the injection molding material 1, such as type, shape, distribution, etc., can be selected to ensure the above-mentioned thermal conductivities of the injection molding material 1.The thermal conductivity of the injection molding material 1 can be measured, for example, according to the ASTM D5470, ASTM D7896-19, or ASTM E1225-20 standard. The combination of properties resulting from the composition of the injection molding material 1, namely softness or conformability and comparatively high thermal conductivity, results in an improved injection molding material 1.

[0060] The injection molding material 1 can therefore be used in particular to form thermally conductive plastic bodies 5 (cf. Fig. 3), which are intended to dissipate thermal energy (heat) generated during operation of a component 3 or a component arrangement 4 - this can be the case in particular with electrical or electronic components 3 or component arrangements 4. Corresponding thermally conductive plastic bodies 5 can be produced by injecting the (molten) injection molding material 1 at least partially onto a respective component 3 or a respective component arrangement 4 during an injection molding process, or by overmolding a respective component 3 or a respective component arrangement 4 at least partially with the (molten) injection molding material 1 during an injection molding process.In all cases, within the scope of a corresponding injection molding process, at least one surface of a respective component 3 or a respective component arrangement 4 is covered or overlapped with the injection molding material 1, so that after cooling and solidification, a thermally conductive bond is formed between the component 3 or the component arrangement 4 and the thermally conductive plastic body 5 formed by cooling or solidification of the injection molding material 1.

[0061] The matrix 2.1 of the injection-molding material 1 can be formed by a thermoplastic elastomer based on a styrene polymer or a styrene copolymer. In the exemplary embodiment, the matrix 2.1 of the injection-molding material 1 is formed by a thermoplastic elastomer based on a styrene-butadiene-styrene copolymer; specifically, the matrix 2.1 of the injection-molding material 1 is formed by styrene-ethylene-butylene-styrene, SEBS. SEBS is also characterized by a continuous service temperature in a range between -40°C and 120°C, so there is no risk of the injection-molding material 1 or a thermally conductive plastic body 5 formed from it undesirably softening at the usual operating temperatures of electrical or electronic components or component assemblies 4 and thus possibly even detaching from the component 3 or component assembly 4.The possibility of dissipating thermal energy from a component 3 or a corresponding component arrangement 4 that generates thermal energy during operation is thus ensured over a wide temperature range by using SEBS as the matrix 2.1 of the injection-molding material 1. Further advantageous properties of SEBS are its mechanical stability and weather resistance, which makes the use of corresponding thermally conductive plastic bodies 5 formed from the injection-molding material 1 conceivable in various weather conditions.

[0062] The hardness or softness of the injection molding material 1 or of a thermally conductive plastic body 5 formed therefrom can be in a range between 10 and 80 Shore A, in particular between 15 and 70 Shore A, further in particular between 15 and 60 Shore A, further in particular between 15 and 50 Shore A, further in particular between 15 and 40 Shore A, further in particular between 15 and 30 Shore A. The hardness of the injection molding material 1 or of a thermally conductive plastic body 5 formed therefrom can be adjusted in particular by the type, proportion, and distribution of respective thermally conductive particles 2.2. The Shore A hardness can be measured, for example, according to the ASTM D 2240 standard.

[0063] The thermally conductive particles 2.2 can, in particular, be metal particles and / or metal oxide particles. The matrix 2.1 of the injection-molding material 1 can therefore contain metal particles and / or metal oxide particles. Thus, the injection-molding material 1 can contain thermally conductive particles that are formed by or comprise metal and / or metal oxide particles.

[0064] The thermally conductive particles 2.2 can, in particular, be aluminum particles, aluminum oxide particles, or aluminum hydroxide particles, or mixtures of at least two of the aforementioned. The matrix of the injection-molding material 1 can thus contain aluminum particles and / or aluminum oxide particles and / or aluminum hydroxide particles, or mixtures of at least two of the aforementioned. Thus, the injection-molding material 1 can contain thermally conductive particles that are or comprise aluminum particles, aluminum oxide particles, aluminum hydroxide particles, or mixtures of at least two of the aforementioned.

[0065] The thermally conductive particles 2.2 can have spherical geometries or basic shapes, i.e., e.g., spherical or ball-shaped geometries or basic shapes, or non-spherical geometries or basic shapes, such as, e.g., platelet-like or plate-shaped geometries or basic shapes. The geometry or basic shape of the thermally conductive particles 2.2 and the resulting arrangement or orientation options within the matrix 2.1 can influence the thermal conductivity of the injection-molding material 1, so that the selection of the geometry or basic shape of the thermally conductive particles 2.2 can be made with regard to a desired thermal conductivity of the injection-molding material 1.

[0066] The weight fraction of the thermally conductive particles in the matrix can - fundamentally independent of their chemical composition and their geometry or basic shape - be in a range between 5 and 95 wt.%. The weight fraction of the thermally conductive particles 2.2 in the matrix 2.1 is expediently in a range between 60 and 80 wt.%, in particular between 70 and 80 wt.%, which ensures both the desired thermal conductivity of the injection molding material 1 and the desired processability of the injection molding material 1 in an injection molding process. In particular, despite the comparatively high proportion of thermally conductive particles 2.2, sufficient flowability of the molten or plasticized injection molding material 1 is provided, so that overmolding of a component 3 is possible.

[0067] The size of the thermally conductive particles 2.2 can be in a range between 25 and 300 pm, in particular between 50 and 275 pm, further in particular between 75 and 250 pm, further in particular between 100 and 225 pm, further in particular between 125 and 200 pm. For aluminum-based thermally conductive particles 2.2, the particle size can be in a range between 50 and 100 pm, for thermally conductive particles 2.2 based on other elements, such as boron or nitride (compounds), the particle size can be in a range between 100 and 200 pm.

[0068] The matrix 2.1 of the injection-molding material 1 can, in principle, contain only one type of thermally conductive particles 2.2. However, it is also conceivable for the matrix 2.1 of the injection-molding material 2 to contain a first and at least one second type of thermally conductive particles 2.2. By mixing thermally conductive particles 2.2 that differ in at least one chemical and / or physical parameter, it is possible to specifically influence the property profile of the injection-molding material 1, ie, in particular, its thermal properties, furthermore, in particular, its thermal conductivity.

[0069] In particular, the matrix 2.1 of the injection-molding material 1 can contain two different types of thermally conductive particles 2.2, thus containing thermally conductive particles 2.2 of a first and a second type. The weight fraction of the thermally conductive particles 2.2 of the first type can be in a range between 5 and 75 wt.%, and the weight fraction of the thermally conductive particles of the second type can be in a range between 5 and 75 wt.%, whereby the sum of the fractions does not exceed 100 wt.%. In particular, the sum of the fractions of the thermally conductive particles of the first and the at least one second type can be in a range between 50 and 80 wt.%, more particularly in a range between 60 and 75 wt.%.

[0070] The thermally conductive particles 2.2 of the first type can be aluminum oxide particles, and the thermally conductive particles 2.2 of the second type can be nitride particles, in particular boron nitride particles. Corresponding nitride particles, in particular boron nitride particles, which are characterized by comparatively high thermal conductivity and low electrical conductivity, can influence not only the thermal conductivity of the injection-molding material 1 but also the mechanical properties of the injection-molding material 1 or a thermally conductive plastic body 5 formed therefrom. As mentioned, the weight fraction of the thermally conductive particles 2.2 of the first type can be in a range between 5 and 75 wt.%, and the weight fraction of the thermally conductive particles of the second type can be in a range between 5 and 75 wt.%, whereby the sum of the fractions does not exceed 100 wt.%.In particular, the sum of the proportions of the thermally conductive particles 2.2 of the first and of the at least one second type is in a range between 50 and 80 wt.%, more particularly in a range between 60 and 75 wt.%.

[0071] For processability in an injection molding process, in addition to the melting temperature of the matrix

[0072] 2.1 – this is typically around 170°C for SEBS – the melt volume flow rate of the injection molding material 1 in a molten state is a significant factor. The injection molding material 1 can have a melt volume flow rate in a range between 4 and 20 g / 10 min (at 190°C / 2.16 kg or 230°C / 2.16 kg) in a molten state. The comparatively high melt volume flow rate enables reliable overmolding of components 3, even with complex geometries, and prevents fragile components or sections from being damaged during overmolding. The comparatively high melt volume flow rate of the injection molding material 1 also enables good filling of the cavity of a respective injection mold and reduces the formation of flash and air inclusions. The melt volume flow rate can be measured, for example, according to DIN EN ISO 1133.

[0073] An important property for various applications or fields of use of the injection molding material 1 or a thermally conductive plastic body 5 formed from it – this applies particularly to electrical or electronic applications or fields of use – is its flammability. The injection molding material 1 can exhibit a flammability rating of Class v0 according to UL-94. The injection molding material 1 can therefore achieve a very high classification, which provides a significant safety advantage, especially in high-temperature applications.

[0074] For various applications or fields of use of the injection-molding material 1 or a thermally conductive plastic body 5 formed therefrom—this applies in particular to electrical or electronic applications or fields of use, such as rechargeable or battery applications—a special relative temperature index, or RTI for short, is also required. The injection-molding material 1 can therefore have a relative temperature index, or RTI, of at least 80°C, in particular at least 90°C, and more particularly at least 100°C.

[0075] For various applications or fields of use of the injection molding material 1 or a thermally conductive plastic body 5 formed therefrom—this applies in particular to electrical or electronic applications or fields of use—a particularly (low) electrical conductivity, and thus a particular electrical resistance, is required. The injection molding material 1 can therefore have a comparatively low electrical conductivity. The dielectric strength of the injection molding material 1 can be at least 3.0 kV / mm. The injection molding material 1 can therefore be electrically insulating up to at least 3.0 kV. The dielectric strength can be measured, for example, according to the ASTM D 149 standard.

[0076] The composition of the injection molding material 1 according to a first specific embodiment can be as follows: The matrix 2.1 consisting of SEBS contains approximately 30 wt.% aluminum particles with a round or spherical basic shape and approximately 45 wt.% aluminum hydroxide particles with a platelet-like or platelet-shaped basic shape. The matrix 2.1 consisting of SEBS therefore makes up approximately 25 wt.% of the injection molding material 1. The aluminum particles can be obtained, for example, from Benda-Lutz GmbH. The aluminum hydroxide particles can be obtained, for example, from Nabaltec AG. This embodiment can also be realized with aluminum particles with a platelet-like or platelet-shaped basic shape and with aluminum hydroxide particles with a round or spherical basic shape.

[0077] The composition of the injection molding material 1 according to a second specific embodiment can be as follows: The matrix 2.1 consisting of SEBS contains approximately 30 wt.% aluminum oxide particles with a platelet-like or spherical basic shape and approximately 30 wt.% boron nitride particles with a round or spherical basic shape. The matrix 2.1 consisting of SEBS therefore makes up approximately 25 wt.% of the injection molding material 1. The aluminum oxide particles can be obtained, for example, from Almatis GmbH, Bassermann, Huber Advanced Materials, Showa Denko, or Silbelco. The boron nitride particles can be obtained, for example, from 3M, Saint Gobain, Henze, Momentive, or Kennametal. This embodiment can also be realized with aluminum oxide particles with a round or spherical basic shape and with boron nitride particles with a platelet-like or spherical basic shape.

[0078] Alternative embodiments can alternatively or additionally comprise at least one of the following particle types as thermally conductive particles 2.2: thermally titanium particles, titanium oxide (TiO, TiO2 or Ti2O3) particles, titanium hydroxide) particles or mixtures of at least two of the aforementioned; zirconium particles, zirconium oxide (ZrO2) particles, zirconium hydroxide (Zr(OH)4) particles or mixtures of at least two of the aforementioned; magnesium particles, magnesium oxide (MgO) particles, magnesium hydroxide (Mg(OH)2) particles or mixtures of at least two of the aforementioned; iron particles, iron oxide (Fe2O3 or FeO^) particles, iron hydroxide (Fe(OH)3) particles or mixtures of at least two of the aforementioned; carbon-based particles, such as graphite and / or carbon black.

[0079] Fig. 2 shows a flowchart of the steps of a method for processing an injection molding material 1 according to an exemplary embodiment. The method comprises, in particular, step S1: melting or plasticizing the injection molding material 1, and step S2: injecting the melted or plasticized thermally conductive injection molding material 1 into a shaping cavity of an injection mold. The method can in principle be carried out using any injection molding machine, which typically has a plasticizing unit, e.g. formed by or comprising a cylinder, for plasticizing the injection molding material 1 and / or an injection unit, e.g. formed by or comprising a screw movably mounted within a corresponding cylinder, for injecting the plasticized injection molding material 1 into a shaping cavity of an injection mold.The method can thus be implemented as an injection molding process in which the injection molding material 1 is melted or plasticized and injected into a molding cavity of an injection mold. The method can be further developed by arranging a component 3, which is to be overmolded at least partially with the injection molding material 1, within the molding cavity of the injection mold. In this respect, a method for producing a component arrangement provided at least partially with a thermally conductive layer formed by a thermally conductive plastic body 5 can be implemented.

[0080] The method comprises in particular the following steps: providing at least one component 3 which generates thermal energy (heat) in at least one operating state, in particular at least one electrical or electronic component which generates heat in at least one operating state, and at least sectionally encapsulating the at least one component 3 which generates heat in at least one operating state with a molten or plasticized injection molding material 1 to form the component arrangement 4. The encapsulation of the at least one component 3 with the molten or plasticized injection molding material 1 can therefore be carried out within the framework of an injection molding process in which the injection molding material 1 is melted or plasticized and injected into a shaping cavity of an injection mold in which the at least one component 3 is arranged or held in order to at least sectionally be encapsulated with the molten orplasticized injection molding material 1.

[0081] A component arrangement 4 produced in this way, shown in a schematic diagram in Fig. 3, typically consists of at least one component 3, i.e. an electrical and / or electronic component, and the thermally conductive plastic body 5 which covers said component at least in sections and is formed by cooling or solidifying the injection-molding material 1. In the exemplary embodiment, the component 3 comprises, for example, a circuit board 3.1 on which electrical or electronic components 3.2 are arranged or formed.

[0082] It is clear that the geometry of the plastic body 5 is at least partially modeled on the geometry of the component 3, so that the plastic body 5 rests flatly on the surface of the component 3, at least in part, which leads to good heat transfer from the component 3 to the plastic body 5. It is clear that the thermally conductive plastic body 5 covers the component 3, i.e., the circuit board 3.1 and the components 3.2, so that these are at least partially, possibly completely, embedded in the injection-molding material 1.

[0083] Specifically, the component arrangement 4 can be an electrical or electronic control system, in particular an electrical or electronic rechargeable battery or battery control system, for a rechargeable battery or battery of a rechargeable battery-operated tool, such as a screwing tool. The component 3, which is at least partially overmolded with the injection-molding material 1, can be a circuit board 3.1 or control board equipped with one or more electrical and / or electronic components.

[0084] The geometry of the thermally conductive plastic body 5 can, although not shown, have one or more cooling structures, such as cooling fins, and / or one or more stiffening structures, such as stiffening ribs, which can be formed in one piece or integrally with the thermally conductive plastic body 5 during the injection molding process by appropriately shaping the cavity of the respective injection mold.

[0085] By injecting - the same would apply in principle to other types of attachment or fastening - a corresponding thermally conductive plastic body 5 made of the injection-molding material 1 onto a corresponding component 3, the operating temperature of the respective component 3 or the corresponding component arrangement 4 can be reduced, which can considerably extend the service life of the component 3 or the component arrangement 4.

Claims

PATENTED SPEAKS 1. Thermally conductive injection molding material (1) which can be processed in an injection molding process, comprising a matrix (2.1) made of at least one thermoplastic elastomer, wherein the matrix (2.1) contains thermally conductive particles (2.2).

2. Thermally conductive injection molding material according to claim 1, wherein the matrix (2.1) is formed by a thermoplastic elastomer based on a styrene polymer or a styrene copolymer.

3. Thermally conductive injection molding material according to claim 1 or 2, wherein the matrix (2.1) is formed by a thermoplastic elastomer based on a styrene-butadiene-styrene copolymer, SBS.

4. Thermally conductive injection molding material according to one of the preceding claims, wherein the matrix (2.1) is formed by styrene-ethylene-butylene-styrene, SEBS.

5. Thermally conductive injection molding material according to one of the preceding claims, wherein the thermally conductive particles (2.2) are or comprise metal particles and / or metal oxide particles.

6. Thermally conductive injection molding material according to one of the preceding claims, wherein the thermally conductive particles (2.2) are or comprise aluminum particles, aluminum oxide particles, aluminum hydroxide particles.

7. Thermally conductive injection molding material according to one of the preceding claims, wherein the weight fraction of the thermally conductive particles (2.2) in the matrix (2.1) is in a range between 5 and 75 wt.%.

8. Thermally conductive injection molding material according to one of the preceding claims, wherein the matrix (2.1) contains a first and at least one second type of thermally conductive particles (2.2) which differ in their chemical composition.

9. Thermally conductive injection molding material according to claim 8, wherein the weight proportion of the thermally conductive particles (2.2) of the first type is in a range between 5 and 75 wt.% and the weight proportion of the thermally conductive particles of the second type is in a range between 5 and 75 wt.%, the sum of the proportions not exceeding 100 wt.%.

10. Thermally conductive injection molding material according to one of the preceding claims, wherein the thermally conductive particles of the first type are aluminum oxide particles and the thermally conductive particles of the second type are nitride particles, in particular boron nitride particles.

11. Thermally conductive injection molding material according to one of the preceding claims, wherein it has a thermal conductivity in a range between 0.5 and 2.5 W / mK.

12. Thermally conductive injection molding material according to one of the preceding claims, wherein it has a melt volume flow rate of 6 g / 10 min in a molten state.

13. Thermally conductive injection molding material according to one of the preceding claims, wherein it has a burning behavior of class v0 according to UL-94.

14. Thermally conductive injection molding material according to one of the preceding claims, wherein it has a hardness in a range between 10 and 80 Shore A, in particular between 15 and 50 Shore A, further in particular between 15 and 30 Shore A.

15. Thermally conductive injection molding material according to one of the preceding claims, wherein it has a relative temperature index, RTI, of at least 80°C, in particular at least 90°C, further in particular at least 100°C.

16. Thermally conductive injection molding material according to one of the preceding claims, wherein it has electrically insulating properties.

17. A method for processing a thermally conductive injection molding material (1) according to one of the preceding claims, comprising the steps of: melting the thermally conductive injection molding material (1) and injecting the melted thermally conductive injection molding material (1) into a molding cavity of an injection mold.

18. A method for producing a component arrangement (4) provided at least in sections with a thermally conductive layer, comprising the following steps: - Providing at least one component (3) generating heat in at least one operating state, in particular at least one electrical or electronic component (3) generating heat in at least one operating state, - at least partially overmolding the at least one component (3) generating heat in at least one operating state with a molten thermally conductive injection molding material (1) according to one of claims 1 to 16 to form the component arrangement (4).

19. Component arrangement (4) manufactured according to a method according to claim 18.

20. Component arrangement (4) according to claim 19, wherein the component arrangement (4) consists of the at least one component (3), which is an electrical and / or electronic component, and the thermally conductive plastic body covering said component at least in sections and formed by cooling or solidification of the injection molding material (1).

21. Component arrangement according to claim 20, wherein the geometry of the thermally conductive plastic body is at least partially modeled on the geometry of the at least one component (3), so that the thermally conductive plastic body rests at least partially flat on the surface of the at least one component (3).

22. Component arrangement according to claim 20 or 21, wherein the component arrangement (4) is an electrical or electronic control system, in particular an electrical or electronic rechargeable battery or battery control system, for a rechargeable battery or a battery of a rechargeable battery or battery-operated tool, such as a screwing tool.

23. Component arrangement according to one of claims 19 to 22, wherein the at least one component (3) is a circuit board, in particular a control board, equipped with one or more electrical and / or electronic components.

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