TRANSLUCENT MULTI-LAYER BODY WITH THERMAL OR PRESSURE-SENSITIVE DECORATIVE LAYER

Description

[0001] The present invention relates to a multilayer body comprising a carrier layer made of a thermoplastic polycarbonate molding compound and a thermo- or pressure-sensitive decorative layer, a lighting or display unit comprising the multilayer body and a light source, a method for producing the multilayer body and the use of a thermoplastic polycarbonate molding compound as the carrier layer of such a multilayer body.

[0002] Decorative ambient lighting elements and backlit functional / display elements are increasingly used in automotive interiors and bodywork applications. A market trend involves activating the lighting or display of functions only when needed, for example, to create a day / night differentiation in the appearance of such elements, or to intensify the perception of space in the automotive interior through such dynamic ambient lighting, or to enable the display of information as required and appropriate to the situation.

[0003] These lighting or functional elements include, for example, fully or partially illuminated trim strips, decorative panels, trim panels, steering wheel covers, consoles, handles or instrument panel carriers, or control elements with which various functions of the vehicle can be operated, such as start / stop buttons as well as controls for the vehicle lighting or climate control, or display elements with which information can be displayed when required.

[0004] Such components or building elements are generally manufactured from technical thermoplastics, as these allow for a high degree of component individuality and functional integration in large-scale forming processes that are simple and cost-effective to implement, especially injection molding.

[0005] For components with a decorative function, there is often a desire to apply a decorative layer to the visible surface. The aim is to adapt its appearance, feel, and / or resistance to environmental influences—such as light, UV, or heat resistance, chemical resistance, or scratch resistance—to the technical requirements of such components or to meet customer demands for a high-quality and distinctive aesthetic. This can be achieved, for example, and preferably, using an in-mold decoration (IMD) process in injection molding. In this process, the decorative layer is introduced into the injection mold and subsequently back-injected with a thermoplastic molding compound. Surfaces with the appearance of a natural material (such as wood, stone, or leather) or a textile are particularly in demand in this context—especially in the luxury vehicle sector.Such components can be manufactured by using layers of stone, animal skin products, textile fabrics containing or consisting of synthetic fibers, materials of plant origin or containing components of plant origin, such as wood, cork, silk, natural fiber textiles or paper, or laminates containing one or more of the aforementioned materials in an IMD process.

[0006] If these layers are sufficiently thin, they can be illuminated with good luminous efficacy by light in the visible wavelength range (from 380 to 780 nm) from a light source, such as an LED. This allows for a day / night differentiation of the surface appearance in multilayer components, provided the base layer made of thermoplastic molding compound also exhibits sufficient light transmission in the visible wavelength range. In day mode, these components have the appearance of the decorative layer, i.e., for example, the natural material or textile. In night mode, the components illuminated by a light source can be used as a diffuse lighting element to create exceptional ambient lighting scenarios.If the decorative layer is partially coated on the back with a layer that is opaque to light and / or the decorative layer itself is opaque to light, but is provided with openings in the form of, for example, shapes, lines, signs or symbols in certain areas, such components also allow the representation of patterns or information or the selective illumination of special functional elements or functional areas in the multilayer component as required.

[0007] However, such decorative layers made of the materials described above, especially when they are so thin that they are translucent, are often thermosensitive, i.e., sensitive to temperature and / or pressure. If excessively high temperatures or pressures are used in the IMD process during the production of the multilayer component, this often leads to a high number of component rejects due to thermal burns on the decorative layer. These burns can manifest, for example, as color changes, which are visible at least on the side of the multilayer body facing the thermoplastic and when viewed through light, particularly in the area of ​​the gate points.

[0008] Or, rejection occurs due to deformations of the decorative layer, which can lead to local bond delamination, blistering or orange peel formation in the decorative layer, and / or due to mechanical damage to the decorative layer, which, especially in brittle materials such as stone, can lead to cracks, chips or, in the worst case, to the complete destruction (bursting, splitting, shattering) of the decorative layer.

[0009] Multi-layer components with a thermo- or pressure-sensitive decorative layer, as well as methods for their production, are generally known.

[0010] DE 102018127648 (B3) discloses a method for manufacturing a molded part, in particular a decorative part and / or trim part designed as a molded part for a vehicle interior with high-quality visual decor and appealing feel, wherein the molded part comprises a wood veneer designed as a decorative layer and a substrate. The method according to the invention comprises back-injection of a wood veneer intended to form the decorative layer with a substrate material, in particular with a plastic, preferably an ABS (acrylonitrile butadiene styrene copolymer) plastic, to form the substrate.

[0011] EP 2301736 A1 discloses a multilayer plastic composite component, in particular for use as a decorative application or trim panel in the automotive sector, and a method for its manufacture comprising back injection, preferably at low pressure, of a decorative layer of, for example, a wood veneer, a laminate, a textile or paper substrate.

[0012] DE 19910241A1 discloses a display unit, particularly for a vehicle, with a display front equipped with characters having a transparent section and a substantially opaque section enclosed by the transparent section, and which has a light source arranged behind the display front for illumination by means of transmitted light, wherein the substantially transparent section is formed by a perforation in the display front and the substantially opaque section is arranged on a transparent substrate. The display front is made of an opaque material, such as wood, fabrics, textiles, veneers or even a thin film.

[0013] WO 2017009152A1 discloses a plastic molded body coated with wood veneer, comprising a base body made of fiber-reinforced plastic and a wood veneer which forms or covers at least one surface area of ​​the plastic molded body, and a method for producing such a plastic molded body, wherein the base body made of fiber-reinforced plastic is heated to a temperature which is preferably 10°C to 50°C higher than a melting point or glass transition temperature of the plastic matrix of the base body, thereby thermally bonding at least one area of ​​the base body with the wood veneer.

[0014] DE 102008028608A1 discloses a method for manufacturing a component with a surface decoration, in which the surface decoration, having a stone decoration, is formed on a plastic substrate by back-injecting, back-pressing, or back-blown the stone decoration with a plastic material such as acrylonitrile butadiene styrene terpolymer (ABS), polycarbonate (PC), blends of polycarbonate and acrylonitrile butadiene styrene terpolymer (PC / ABS), polymethyl methacrylate (PMMA), polystyrene (PS), or polyurethane (PUR). A preferred embodiment of the invention provides for a design that is at least partially light-transparent in the area of ​​the stone decoration.

[0015] DE 19909869C2 discloses a method for manufacturing a cladding part in which a thin decorative layer is applied to a carrier element by means of an adhesive material, wherein the thin decorative layer consists of an organic and / or crystalline material that is prone to breakage in thin layers, in particular natural stone.

[0016] WO 2021063718 A1 discloses an LED lighting unit comprising a multilayer body and an LED light source, wherein the multilayer body consists of the following layers in this order: a1) a support layer of a thermoplastic composition, a2) a natural stone layer, a3) a transparent layer of a thermoplastic composition. Polycarbonate-based compositions are disclosed as suitable thermoplastic compositions for forming layers a1) and / or a3).

[0017] EP 1144177B1 discloses a method for producing a composite molded part in which a flexible outer material, in particular a decorative material such as fabric, leather, foil or the like, is back-injected with plastic at the lowest possible pressure within a cavity formed between a die plate and a mold core. Care must be taken during back-injection to ensure that the often delicate outer materials are not damaged.

[0018] For an appealing visual impression of the multilayer body when backlit, it is also desirable that the plastic substrate diffuses the light from a point light source, such as an LED, to some extent, thus creating a diffuse illumination pattern of the backlit component. Otherwise, the light source would be visible to the viewer and / or the desired visual effect when the light source is switched on would be limited to a small area of ​​the multilayer body. In some cases, particularly with thin-walled, large-area, and / or geometrically complex components, gate points for the injection molding process are unavoidably located in the visible area of ​​the multilayer body on the side of the plastic substrate facing away from the side of the multilayer body that is covered with the decorative layer.Insufficient light diffusivity of the plastic substrate, when the multilayer body is illuminated from the visible side, leads to these casting marks becoming visible in an undesirable way, thus detracting from the high-quality appearance of the lighting fixture. To achieve the desired diffuse light impression from a surface of the multilayer body illuminated by a point light source, the substrate layer must exhibit both the highest possible transmission of the incident visible light and the highest possible light diffusivity due to light scattering, i.e., the largest possible half-value angle of the light cone resulting from a point light source passing through the substrate layer.The larger this half-value angle, the more spatially homogeneous the perceived illumination intensity of the light emanating from a point light source after passing through the substrate layer. Consequently, gate marks or other visual defects resulting from the injection molding process on the side of the plastic substrate facing away from the viewing side become less noticeable when backlit on the visible side of the illuminated multilayer body. With large light diffusivity half-value angles of the substrate layer, even larger areas can be illuminated by point light sources with largely homogeneous light intensity. Generally, the transmission and light diffusivity (half-value angle) of a material cannot be adjusted independently and are usually inversely proportional to each other.Optimizing light diffusivity through material modification, for example by changing its composition, usually results in decreasing transmission. Both parameters are particularly dependent on the thickness of the material layer being illuminated, with increasing layer thickness leading to a decrease in transmission and an increase in the light diffusivity of a translucent material.

[0019] Such components or assemblies for interior and exterior automotive applications are subject to further application-related requirements, such as high material ductility, high heat resistance, and dimensional stability, especially at low temperatures. Thermoplastics suitable for such applications, and therefore established in these fields, such as polycarbonate, acrylonitrile butadiene styrene terpolymers (ABS), and blends of these two thermoplastics, either exhibit excessively high melt viscosity, thus requiring high melting temperatures and / or high injection pressures in the injection molding process, particularly when producing complex, large-area, and / or thin substrate layers. This leads to the problems described above (high reject rates in the production process) when using thermo- and / or pressure-sensitive decorative layers. Alternatively, the thermoplastics may exhibit insufficient mechanical properties and / or light diffusivity.This applies in particular to transparent polycarbonate or polycarbonate compounds containing scattering additives. Furthermore, ABS plastics, ABS / PC or PC / ABS blends currently used in such applications, which can generally be processed at lower melt temperatures or injection pressures due to their lower melt viscosity compared to polycarbonate and generally exhibit high light diffusivity, have insufficient light transmission. This means that their use in the production of multilayer components results in insufficient light output on the visible side of the component when backlit.

[0020] It was therefore desirable to provide a diffusely translucent multilayer body with improved light yield and an improved aesthetic appearance in both the non-translucent and / or translucent states, comprising a base carrier made of a thermoplastically processable material and a thermo- and / or pressure-sensitive decorative layer selected from the group consisting of stone product, animal hide product, textile fabric containing synthetic fibers, material of plant origin or containing components of plant origin, or laminate containing one or more of the aforementioned materials.The thermoplastic material should meet the general application-related requirements of the automotive industry for materials used to manufacture components for interior and exterior applications. It should also be processable at low melting temperatures and injection pressures using an IMD process, thereby improving the quality of the multilayer components and reducing reject rates in the production process. Furthermore, it was desirable to provide a process for manufacturing such a multilayer component in which the decorative layer is applied to the thermoplastic molding compound substrate using an IMD process.

[0021] For this, it was necessary that the substrate material exhibit, on the one hand, a combination of improved transmission for light in the visible wavelength range and high light diffusivity (i.e., a large half-value angle), and on the other hand, good thermoplastic processing behavior (i.e., low melt viscosity or high melt flowability), and, in addition, high material ductility, especially at low temperatures, as well as high heat resistance.

[0022] Surprisingly, it was found that a multilayer body, comprising (I) a carrier layer of a thermoplastic molding compound comprising A) at least one representative selected from the group consisting of aromatic polycarbonate and aromatic polyester carbonate, B) rubber-modified vinyl(co)polymer of B.1) 80 to 95 wt.%, based on the rubber-modified vinyl(co)polymer B, structural units derived from at least one vinyl monomer, and B.2) 5 to 20 wt.%, based on the rubber-modified vinyl(co)polymer B, one or more rubber-elastic graft bases with glass transition temperatures < -50°C, determined by differential scanning calorimetry according to DIN EN 61006 in the 1994 version at a heating rate of 10 K / min with determination of the glass transition temperature as the midpoint temperature, comprising at least 50 wt.%, based on B.2, of structural units derived from 1,3-butadiene, wherein the rubber-modified Vinyl(co)polymer B (i) a dispersed phase consisting of (i.1) rubber particles grafted with vinyl(co)polymer from structural units according to B.1 and (i.2) vinyl(co)polymer also from structural units according to B.1 enclosed in the rubber particles as a separate dispersed phase and (ii) a rubber-free vinyl(co)polymer matrix consisting of structural units according to B.1, not bound to and not enclosed in the rubber particles, wherein the dispersed phase according to (i) has a mean diameter D50 measured by ultracentrifugation of 0.7 to 2.0 µm, C) optionally at least one further component selected from polymer additives and polymeric blend partners, wherein the thermoplastic molding compound contains less than 2 wt.% of rubber-based graft polymers other than component B) and wherein the thermoplastic molding compound has a rubber content of at least 1.5 wt.-%, and (II) a layer of a material selected from the group consisting of stone product, animal hide product, textile fabric containing synthetic fibers, material of vegetable origin or containing components of vegetable origin or laminate containing one or more of the aforementioned materials, . wherein the layer (II) has a transmittance of at least 25%, preferably at least 40%, and most preferably at least 50% in at least partial areas at its actual thickness at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum measured in accordance with the specifications in DIN / ISO 13468-2 in the 2006 version, or wherein the layer (II) has a transmittance of less than 25% over the entire wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum measured in accordance with the specifications in DIN / ISO 13468-2 in the 2006 version, and wherein the layer (II) has at least one recess in the form of at least one symbol, pattern, hole, line, or character, or wherein the recesses are point-shaped.which are arranged in the form of at least one symbol, pattern, hole, line or sign, and which solve the aforementioned task.

[0023] In the event that the layer (II) has a transmittance of at least 25%, preferably at least 40%, and most preferably at least 50% in at least partial areas at its actual thickness at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum measured in accordance with the specifications in DIN / ISO 13468-2 in the 2006 version, the layer may optionally have at least one recess in the form of at least one symbol, pattern, hole, line, or character, or it may be point-shaped recesses arranged in the form of at least one symbol, pattern, hole, line, or character.

[0024] In a preferred embodiment, the thermoplastic molding compound of the support layer (I) contains 30 to 85 wt.%, more preferably 50 to 82 wt.%, even more preferably 58 to 82 wt.%, most preferably 65 to 75 wt.% of component A, 14 to 69 wt.%, more preferably 17 to 49 wt.%, even more preferably 17 to 41 wt.%, most preferably 24 to 34 wt.% of component B, 0.05 to 20 wt.%, more preferably 0.1 to 10 wt.%, even more preferably 0.2 to 5 wt.%, most preferably 0.3 to 2 wt.% of component C.

[0025] In a preferred embodiment, the molding compound of the carrier layer (I) contains less than 1 wt.%, more preferably less than 0.5 wt.%, and even more preferably less than 0.2 wt.% of rubber-based graft polymers other than component B). Most preferably, the molding compound contains no rubber-based graft polymers other than component B.

[0026] In a preferred embodiment, the molding compound of the carrier layer (I) has a rubber content in the range of 1.5 to 6 wt.%, more preferably in the range of 1.8 to 5 wt.%, even more preferably in the range of 1.9 to 4.1 wt.%, most preferably in the range of 2.5 to 3.5 wt.%.

[0027] The aforementioned preferred areas of components A and B, as well as component C, can be combined in any way desired.

[0028] In a preferred embodiment, the carrier layer (I) consists of a thermoplastic molding compound which comprises at least 80 wt.%, more preferably at least 95 wt.%, more preferably at least 99 wt.% and most preferably 100 wt.% of components A, B and C.

[0029] The carrier layer (I) is also referred to as the plastic carrier or carrier within the scope of the present invention.

[0030] The multilayer body is suitable for illumination by a light source with visible light (from 380 to 780 nm), i.e., the multilayer body is translucent. The light source is arranged such that the light first strikes the substrate material (I) and then passes through layer (II) or, particularly whenever layer (II) is opaque or insufficiently transparent to visible light, through openings formed in layer (II). Preferably, the light source is an LED.

[0031] Translucent means that when the light source is switched on, the visual impression on the side facing away from the light source, i.e., the visible side of the component or element in its installed state, changes.

[0032] In a preferred embodiment, the multilayer body has a transmittance of at least 10%, more preferably at least 25%, more preferably at least 40%, and most preferably at least 45%, at least in partial areas at its actual thickness at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum, which is measured according to the specifications in DIN / ISO 13468-2 in the 2006 version.

[0033] Another aspect of the invention is the use of a molding compound as described above as a carrier layer (I) in a multilayer body as described above.

[0034] Another object of the invention is a lighting or display unit comprising a multilayer body as described above and a light source which emits light with at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the light source is arranged such that the carrier layer (I) of the multilayer body is irradiated by the light emitted by the light source.

[0035] Another object of the invention is a method for producing a translucent multilayer body, comprising the steps a) Production of a layer from a material selected from the group consisting of stone, animal hide product, textile fabric containing synthetic fibers, material of plant origin or containing components of plant origin, or laminate containing one or more of the aforementioned materials, wherein the layer has, at least in partial areas, a transmittance of at least 25%, preferably at least 40%, and most preferably at least 50% at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum measured in accordance with the specifications in DIN / ISO 13468-2 in the 2006 version, or wherein the layer has a transmittance of less than 25% over the entire wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum.which is measured according to the specifications in DIN / ISO 13468-2 in the 2006 version, and wherein layer (II) has at least one recess in the form of at least one symbol, pattern, hole, line or character, or consists of point-shaped recesses arranged in the form of at least one symbol, pattern, hole, line or character, b) optionally thermoforming the layer produced in step a), c) back-injection of the layer with a thermoplastic molding compound as described above. Composition of the carrier layer (I) Component A

[0036] Aromatic polycarbonates and / or aromatic polyester carbonates suitable according to the invention, as described in component A, are known from the literature or can be produced using methods known from the literature (for the production of aromatic polycarbonates, see, for example, Schnell, "Chemistry and Physics of Polycarbonates", Interscience Publishers, 1964, as well as DE-AS 1 495 626, DE-A 2 232 877, DE-A 2 703 376, DE-A 2 714 544, DE-A 3 000 610, DE-A 3 832 396; for the production of aromatic polyester carbonates, see, for example, DE-A 3 007 934). Aromatic polycarbonates are produced, for example, by...by reacting diphenols with carbonic acid halides, preferably phosgene, and / or with aromatic dicarboxylic acid dihalides, preferably benzene dicarboxylic acid dihalides, according to the interface method, optionally using chain terminators, for example monophenols, and optionally using trifunctional or more than trifunctional branchers, for example triphenols or tetraphenols. Likewise, production via a melt polymerization process by reacting diphenols with, for example, diphenyl carbonate is possible.

[0037] Diphenols for the production of aromatic polycarbonates and / or aromatic polyester carbonates are preferably those of formula (I) where A a single bond, C 1 to C 5 alkylenes, C 2 to C 5 alkylidenes, C 5 to C 6 cycloalkylidenes, -O-, -SO-, -CO-, -S-, -SO 2-, C 6 to C 12 arylenes, to which further aromatic rings, optionally containing heteroatoms, may be fused, or a residue of formula (II) or (III) B each C 1 to C 12 -alkyl, preferably methyl, halogen, preferably chlorine and / or bromine x each independently of each other 0, 1 or 2, p 1 or 0, and R 5< and R 6< for each X 1< individually selectable, independently of each other hydrogen or C 1 to C 6 -alkyl, preferably hydrogen, methyl or ethyl, X1 carbon and m an integer from 4 to 7, preferably 4 or 5, with the proviso that at least one atom X 1< , R 5< and R 6< are simultaneously alkyl.

[0038] Preferred diphenols are hydroquinone, resorcinol, dihydroxydiphenols, bis-(hydroxyphenyl)-C 1 -C 5 -alkanes, bis-(hydroxyphenyl)-C 5 -C 6 -cycloalkanes, bis-(hydroxyphenyl) ethers, bis-(hydroxyphenyl) sulfoxides, bis-(hydroxyphenyl) ketones, bis-(hydroxyphenyl) sulfones and α,α-bis-(hydroxyphenyl)-diisopropyl benzenes as well as their nuclear-brominated and / or nuclear-chlorinated derivatives.

[0039] Particularly preferred diphenols are 4,4'-dihydroxydiphenyl, bisphenol A, 2,4-bis(4-hydroxyphenyl)-2-methylbutane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl sulfone, and their di- and tetrabrominated or chlorinated derivatives, such as 2,2-bis(3-chloro-4-hydroxyphenyl)propane, 2,2-bis-(3,5-dichloro-4-hydroxyphenyl)propane, or 2,2-bis-(3,5-dibromo-4-hydroxyphenyl)propane. 2,2-bis-(4-hydroxyphenyl)propane (bisphenol A) is particularly preferred.

[0040] The diphenols can be used individually or in any mixture. The diphenols are known from the literature or can be obtained through methods known from the literature.

[0041] Suitable chain termination compounds for the production of thermoplastic aromatic polycarbonates include, for example, phenol, p-chlorophenol, p-tert-butylphenol or 2,4,6-tribromophenol, but also long-chain alkylphenols, such as 4-[2-(2,4,4-trimethylpentyl)]-phenol, 4-(1,3-tetramethylbutyl)-phenol according to DE-A 2 842 005 or monoalkylphenol or dialkylphenols with a total of 8 to 20 carbon atoms in the alkyl substituents, such as 3,5-di-tert-butylphenol, p-iso-octylphenol, p-tert-octylphenol, p-dodecylphenol and 2-(3,5-dimethylheptyl)-phenol and 4-(3,5-dimethylheptyl)-phenol. The amount of chain terminators to be used is generally between 0.5 mol% and 10 mol%, based on the total moles of the diphenols used.

[0042] The thermoplastic aromatic polycarbonates have mean molecular weights (average weight Mw) of preferably 20,000 to 40,000 g / mol, more preferably 24,000 to 32,000 g / mol, and particularly preferably 26,000 to 30,000 g / mol, measured by gel permeation chromatography (GPC) calibrated against bisphenol A polycarbonate standards using dichloromethane as the eluent. Calibration was performed using linear polycarbonates (from bisphenol A and phosgene) of known molar mass distribution from PSS Polymer Standards Service GmbH, Germany, and according to method 2301-0257502-09D (from 2009 in German) of Currenta GmbH & Co. OHG, Leverkusen. The eluent is dichloromethane. The columns are made of cross-linked styrene-divinylbenzene resins. The analytical columns have a diameter of 7.5 mm and a length of 300 mm. Column material particle size: 3 µm to 20 µm. Solution concentration: 0.2 wt%. Flow rate: 1.0 ml / min. Solution temperature: 30°C.Use of UV and / or RI detection.

[0043] The preferred areas result in a particularly advantageous balance of mechanical and rheological properties in the compositions according to the invention.

[0044] The thermoplastic aromatic polycarbonates can be branched in a known manner, preferably by the incorporation of 0.05 to 2.0 mol%, based on the total amount of diphenols used, of trifunctional or more than trifunctional compounds, for example, those with three or more phenolic groups. Linear polycarbonates, more preferably based on bisphenol A, are preferred.

[0045] Both homopolycarbonates and copolycarbonates are suitable. For the production of copolycarbonates according to the invention, component A, 1 to 25 wt.%, preferably 2.5 to 25 wt.%, based on the total amount of diphenols to be used, of polydiorganosiloxanes with hydroxyaryloxy end groups can also be used. These are known (US 3,419,634) and can be produced according to methods known in the literature. Polydiorganosiloxane-containing copolycarbonates are also suitable; the production of polydiorganosiloxane-containing copolycarbonates is described, for example, in DE-A 3,334,782.

[0046] Aromatic dicarboxylic acid dihalides for the production of aromatic polyester carbonates are preferably the diacid dichlorides of isophthalic acid, terephthalic acid, diphenyl ether-4,4'-dicarboxylic acid and naphthalene-2,6-dicarboxylic acid.

[0047] Particularly preferred are mixtures of the diacid dichlorides of isophthalic acid and terephthalic acid in a ratio between 1:20 and 20:1.

[0048] In the production of polyester carbonates, a carbonic acid halide, preferably phosgene, is additionally used as a bifunctional acid derivative.

[0049] In addition to the monophenols already mentioned, other suitable chain terminators for the production of aromatic polyester carbonates include their chlorocarbonate esters, the acid chlorides of aromatic monocarboxylic acids, which may optionally be substituted by C 1 to C 22 alkyl groups or by halogen atoms, and aliphatic C 2 to C 22 monocarboxylic acid chlorides.

[0050] The amount of chain terminators is 0.1 to 10 mol% in each case, based on moles of diphenol in the case of phenolic chain terminators and on moles of dicarboxylic acid dichloride in the case of monocarboxylic acid chloride chain terminators.

[0051] In the production of aromatic polyester carbonates, one or more aromatic hydroxycarboxylic acids can also be used.

[0052] The aromatic polyester carbonates can be either linear or branched in a known manner (see DE-A 2 940 024 and DE-A 3 007 934), with linear polyester carbonates being preferred.

[0053] Branching agents can include, for example, tri- or multi-functional carboxylic acid chlorides, such as trimesic acid trichloride, cyanuric acid trichloride, 3,3'-,4,4'-benzophenone tetracarboxylic acid tetrachloride, 1,4,5,8-napthalin tetracarboxylic acid tetrachloride, or pyromellitic acid tetrachloride, in amounts of 0.01 to 1.0 mol% (based on the dicarboxylic acid dichlorides used), or tri- or multi-functional phenols, such as phloroglucinol, 4,6-dimethyl-2,4,6-tri-(4-hydroxyphenyl)hept-2-ene, 4,6-dimethyl-2,4-6-tri-(4-hydroxyphenyl)heptane, 1,3,5-tri-(4-hydroxyphenyl)benzene, 1,1,1-tri-(4-hydroxyphenyl)ethane, tri-(4-hydroxyphenyl)phenylmethane, 2,2-bis[4,4-bis(4-hydroxyphenyl)cyclohexyl]propane, 2,4-bis(4-hydroxyphenylisopropyl)phenol, tetra(4-hydroxyphenyl)methane, 2,6-bis(2-hydroxy-5-methylbenzyl)-4-methylphenol, 2-(4-Hydroxyphenyl)-2-(2,4-dihydroxyphenyl)-propane, tetra-(4-[4-hydroxyphenyl-isopropyl]-phenoxy)-methane, 1,4-bis[4,4'-dihydroxytriphenyl)-methyl]-benzene, in amounts of 0.01 to 1,0 mol% based on the diphenols used. Phenolic branching agents can be introduced with the diphenols; acid chloride branching agents can be introduced together with the acid dichlorides.

[0054] In thermoplastic aromatic polyester carbonates, the proportion of carbonate structural units can vary as desired. Preferably, the proportion of carbonate groups is up to 100 mol%, particularly up to 80 mol%, and most preferably up to 50 mol%, based on the sum of ester and carbonate groups. Both the ester and carbonate components of the aromatic polyester carbonates can be present in block form or statistically distributed within the polycondensate.

[0055] The thermoplastic aromatic polycarbonates and polyester carbonates can be used alone or in any mixture.

[0056] Preferably, linear polycarbonate based exclusively on bisphenol A is used as component A. Component B

[0057] Component B consists of rubber-modified vinyl(co)polymers made from B.1) 80 to 95 wt.%, preferably 83 to 93 wt.%, further preferably 85 to 92 wt.%, based on the rubber-modified vinyl(co)polymer B, structural units derived from at least one vinyl monomer and B.2) 5 to 20 wt.%, preferably 7 to 17 wt.%, further preferably 8 to 15 wt.%, based on the rubber-modified vinyl(co)polymer B, of one or more rubber-elastic graft bases with glass transition temperatures Tg < -50°C, preferably < -60°C, particularly preferably < -70°C, containing at least 50 wt.%, preferably at least 70 wt.%, particularly preferably 100 wt.%, based on B.2, of structural units derived from 1,3-butadiene, wherein the rubber-modified vinyl(co)polymer B (i) is a dispersed phase consisting of (i.1) with vinyl(co)polymer from structural units according to B.1 grafted rubber particles and (i.2) vinyl(co)polymer also consisting of structural units according to B.1, enclosed in the rubber particles as a separate dispersed phase and (ii) a rubber-free vinyl(co)polymer matrix consisting of structural units according to B.1, which is not bound to and not enclosed in the rubber particles. and wherein the dispersed phase according to (i) has a mean diameter D50 measured by ultracentrifugation of 0.7 to 2.0 µm, preferably of 0.7 to 1.5 µm, in particular of 0.7 to 1.2.

[0058] Unless otherwise expressly described in the present invention, the glass transition temperature Tg is determined for all components by means of differential scanning calorimetry (DSC) according to DIN EN 61006 (version of 1994) at a heating rate of 10 K / min with determination of Tg as the midpoint temperature (tangent method).

[0059] The rubber-modified vinyl(co)polymers according to component B exhibit a melt flow rate (MVR), measured according to ISO 1133 (version of 2012) at 220°C with a ram load of 10 kg, preferably 2 to 20 ml / 10 min, particularly preferably 3 to 15 ml / 10 min, and especially 4 to 8 ml / 10 min. If mixtures of several rubber-modified vinyl(co)polymers are used as component B, the preferred MVR ranges apply to the mean value of the MVR of the individual components, weighted over the mass fractions of the components in the mixture.

[0060] Such rubber-modified vinyl(co)polymers B are produced, for example, by radical polymerization, preferably by bulk polymerization, from B.1 80 to 95 wt.%, preferably 83 to 93 wt.%, particularly preferably 85 to 92 wt.%, based on the rubber-modified vinyl (co)polymer B, at least one vinyl monomer in the presence of B. 2 5 to 20 wt.%, preferably 7 to 17 wt.%, particularly preferably 8 to 15 wt.%, based on the rubber-modified vinyl(co)polymer B, of one or more rubber-elastic graft bases with glass transition temperatures < -50°C, preferably < -60°C, particularly preferably < -70°C, containing at least 50 wt.%, preferably at least 70 wt.%, particularly preferably 100 wt.% based on B.2, of structural units derived from 1,3-butadiene.

[0061] In the bulk polymerization process preferably used to produce the rubber-modified vinyl(co)polymer B, both the polymerization of the vinyl monomers according to B.1 and the grafting of the resulting vinyl(co)polymer onto the rubber-elastic graft base according to B.2 take place. Furthermore, in this reaction process, a dispersed phase (i) consisting of is formed by self-organization (phase separation). (i.1) rubber particles grafted with vinyl(co)polymer from structural units according to B.1 and (i.2) vinyl(co)polymer also from structural units according to B.1 enclosed in the rubber particles as a separated dispersed phase, wherein this rubber-containing phase (i) is dispersed in a rubber-free vinyl(co)polymer matrix (ii) consisting of structural units according to B.1 which is not bound to or enclosed in the rubber particles.

[0062] In contrast to the other vinyl(co)polymer components in component B, the rubber-free vinyl(co)polymer (ii) can be dissolved by suitable solvents such as acetone.

[0063] The size of the dispersed phase (i) in the rubber-modified vinyl(co)polymers B produced in this way is controlled by the reaction conditions such as temperature and the resulting viscosity of the polymer as well as shear by, for example, stirring.

[0064] The mean particle size D50 is the diameter above and below which 50 wt.% of the particles lie. Unless expressly described otherwise in the present invention, it is determined for all components by ultracentrifuge measurement (W. Scholtan, H. Lange, Kolloid, Z. and Z. Polymere 250 (1972), 782-796).

[0065] The monomers B.1 are preferably mixtures consisting of B.1.1 60 to 85 parts by weight, particularly preferably 65 to 80 parts by weight, further preferably 70 to 78 parts by weight, in each case based on the sum of B.1.1 and B.1.2, styrene and B.1.2 15 to 40 parts by weight, particularly preferably 20 to 35 parts by weight, further preferably 22 to 30 parts by weight, in each case based on the sum of B.1.1 and B.1.2, acrylonitrile and optionally B.1.3 0-10 parts by weight, preferably 0-7 parts by weight, further preferably 0-5 parts by weight of methyl methacrylate or n-butyl acrylate, each based on 100 parts by weight as the sum of B.1.1 and B.1.2.

[0066] In a further preferred embodiment, the monomers B.1 are a mixture of 22 to 26 parts by weight of acrylonitrile and 74 to 78 parts by weight of styrene, which may optionally contain up to 10 parts by weight, and particularly preferably up to 5 parts by weight, of n-butyl acrylate or methyl methacrylate, wherein the sum of the parts by weight of styrene and acrylonitrile equals 100 parts by weight.

[0067] Particularly preferred is B.1 free of B.1.3, wherein the preferred ranges mentioned above apply to B.1.1 and B.1.2.

[0068] Preferred graft bases B.2 are diene rubbers containing butadiene, or mixtures of diene rubbers containing butadiene or copolymers of diene rubbers containing butadiene or their mixtures with other copolymerizable monomers (e.g. according to B.1.1 and B.1.2).

[0069] Particularly preferred as graft base B.2 is pure polybutadiene rubber. In a further preferred embodiment, B.2 is styrene-butadiene block copolymer rubber.

[0070] Component B preferably has a polybutadiene content of 5 to 18 wt.%, more preferably of 7 to 15 wt.%, and in particular of 8 to 13 wt.%.

[0071] Particularly preferred rubber-modified vinyl(co)polymers according to component B are bulk ABS polymers such as those described, for example, in DE-OS 2 035 390 (=US-PS 3 644 574) or in DE-OS 2 248 242 (=GB-PS 1 409 275) or in Ullmanns, Encyclopedia of Technical Chemistry, Vol. 19 (1980), p. 280 ff.

[0072] The vinyl(co)polymer (ii), which is not chemically bound to the rubber base(s) B.2 and not encapsulated in the rubber particles, can be formed during the polymerization of the graft polymers B, as previously described. It is also possible that a portion of this vinyl(co)polymer (ii), which is not chemically bound to the rubber base(s) B.2 and not encapsulated in the rubber particles, is formed during the mass polymerization process of the rubber-modified vinyl(co)polymer according to component B, and that another portion is polymerized separately and added to component B as a component of component B. The proportion of the vinyl(co)polymer (ii), regardless of its origin, measured as the acetone-soluble fraction, is preferably at least 50 wt.%, more preferably at least 60 wt.%, and further preferably at least 70 wt.% in component B, based on the total amount of component B.

[0073] This vinyl(co)polymer (ii) has a weight-average molecular weight M w of 70 to 250 kg / mol, preferably of 130 to 200 kg / mol, in particular of 150 to 180 kg / mol in the rubber-modified vinyl(co)polymers according to component B.

[0074] The weight-averaged molecular weight M w of the vinyl(co)polymer (ii) in component B is measured in accordance with the present invention by gel permeation chromatography (GPC) in tetrahydrofuran against polystyrene as a standard.

[0075] Component B is preferably free of alkali, alkaline earth, ammonium or phosphonium salts of saturated fatty acids with 8 to 22 carbon atoms, resin acids, alkyl and alkylarylsulfonic acids and fatty alcohol sulfates.

[0076] Component B preferably contains less than 100 ppm, particularly preferably less than 50 ppm, and most preferably less than 20 ppm ions of alkali metals and alkaline earth metals.

[0077] Suitable rubber-modified vinyl(co)polymers as component B include, for example, Magnum™< 3404, Magnum™< 3504 and Magnum™< 3904 from Trinseo SA (Luxembourg). Component C

[0078] Component C may optionally contain one or more representatives selected from the group consisting of polymer additives and polymer blend partners.

[0079] The polymer additives or polymer blend partners are preferably selected from the group consisting of lubricants and demolding agents, stabilizers, colorants, compatibility enhancers, further impact modifiers different from component B, further polymeric components different from components A and B (for example, functional blend partners or graft polymers with core-shell structure produced by emulsion polymerization process) as well as fillers and reinforcing agents.

[0080] In a preferred embodiment, component C contains no fillers or reinforcing agents. More preferably, it contains no pigments. More preferably, it contains no polymeric blending partners. More preferably, it contains no polymeric components. In a particularly preferred embodiment, it contains neither fillers nor reinforcing agents, pigments, nor polymeric blending partners. Most preferably, it contains neither fillers nor reinforcing agents, pigments, nor polymeric components.

[0081] In a preferred embodiment, at least one polymer additive selected from the group consisting of lubricants, demolding agents and stabilizers is used as component C.

[0082] In a preferred embodiment, at least one representative selected from the group consisting of sterically hindered phenols, organic phosphites, and organic or inorganic Brønsted acids is used as a stabilizer.

[0083] In a preferred embodiment, fatty acid esters, particularly fatty acid esters of pentaerythritol or glycerol, are used as lubricating and demolding agents.

[0084] In a particularly preferred embodiment, component C is at least one polymer additive selected from the group consisting of C8-C22 fatty acid esters of pentaerythritol, C8-C22 fatty acid esters of glycerol, tris(2,4-di-tert-butylphenyl) phosphite, 2,6-di-tert-butyl-4-(octadecanoxycarbonylethyl)phenol, tetrakis(2,4-di-tert-butylphenyl)-4,4-biphenyl diphosphonite, bis(2,4-di-tert-butylphenyl)-pentaerythritol diphosphite and triethylene glycol bis[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate].

[0085] In another embodiment, component C does not contain rubber-modified vinyl(co)polymer produced by emulsion polymerization. Production of the molding compounds for the carrier layer

[0086] Thermoplastic molding compounds are produced from the components A, B and C according to the invention.

[0087] The thermoplastic molding compounds according to the invention can be produced, for example, by mixing the respective components of the compositions in a known manner and melt-compounding and melt-extruding them at temperatures preferably 200°C to 320°C, particularly preferably 240°C to 300°C, and most preferably 260°C to 290°C in conventional units such as internal kneaders, extruders and twin-screw extruders.

[0088] Within the scope of this application, this process is generally referred to as compounding. The term molding compound is therefore understood to be the product obtained when the components of the composition are melt-compounded and melt-extruded.

[0089] The mixing of the individual components of the compositions can be carried out in a known manner, both successively and simultaneously, at approximately 20°C (room temperature) as well as at higher temperatures. This means, for example, that some of the components can be metered via the main feed of an extruder, while the remaining components can be added later in the compounding process via a side extruder. Decorative layer (II)

[0090] The multilayer body contains as layer (II) a layer of stone product, animal hide product, textile fabric containing synthetic fibers, material of plant origin or containing components of plant origin, or laminate containing one or more of the aforementioned materials. wherein the layer (II) has a transmittance of at least 25%, preferably at least 40%, and most preferably at least 50% in at least partial areas at its actual thickness at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum measured in accordance with the specifications in DIN / ISO 13468-2 in the 2006 version, or wherein the layer (II) has a transmittance of less than 25% over the entire wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum measured in accordance with the specifications in DIN / ISO 13468-2 in the 2006 version, and wherein the layer (II) has at least one recess in the form of at least one symbol, pattern, hole, line, or character, or wherein the recesses are point-shaped.which are arranged in the form of at least one symbol, pattern, hole, line, or sign.

[0091] When the multilayer body is illuminated with light from the support side, the shapes represented by the recesses become visible on the visible side of the multilayer body in this embodiment.

[0092] The material used in layer (II) is temperature-sensitive and / or pressure-sensitive. Therefore, it is advantageous to use the lowest possible temperatures or pressures when manufacturing the multilayer bodies by back-injecting layer (II) with the material of the carrier layer (I).

[0093] Materials of plant origin are preferably natural wood, wood veneer, cork, paper, cellulose products or textiles made from natural fibers such as silk, cotton, flax or hemp.

[0094] Materials containing components of plant origin as previously described, which are suitable for producing the decorative layer according to the present invention, contain these components of plant origin in a proportion of preferably at least 20 wt.%, more preferably at least 50 wt.%, more preferably at least 70 wt.%.

[0095] Brittle materials are prone to breakage in thin layers and are therefore sensitive to pressure. This applies, for example, to stone products such as natural stone or other stone-like materials. Within the scope of the present invention, all types of natural stone and stone-like materials are generally referred to as stone or stone product, and the corresponding layer is referred to as stone layer.

[0096] The rock layer is a layer of metamorphic or sedimentary rock. It consists of several relatively discrete layers that can be peeled off as thin sheets from the natural rock material. Suitable rock materials include, for example, shaly claystones or clay shales, limestone, sandstone, mudstone, clay shale, quartzite, phyllite, mica schist, chlorite schist, gneiss, talc schist, blue schist or gluacophane schist, variegated schist, prasinite, epidote amphibolite, amphibolite, embrechite, agmatite, calcareous schist, mylonite, argillite, migmatite, marble, serpentinite, eclogite, schist, fruit schist, or granulite. The rock layer preferably comprises variegated schist, mica schist, limestone, sandstone, or marble; more preferably, it consists of one of these rocks. Basically, the layer of stone can be composed of different stone elements and, for example, represent a mosaic of one or more types of stone.Preferably, however, the stone layer consists of one type of stone and is made in one piece.

[0097] The stone-like materials used are composite materials containing at least 50 wt.%, preferably at least 70 wt.%, more preferably at least 80 wt.%, and most preferably at least 90 wt.% mineral components or components of mineral origin, and up to 50 wt.%, preferably up to 30 wt.%, more preferably up to 20 wt.%, and particularly up to 10 wt.%, polymeric binders and / or other additive components. Such composite materials are produced by compounding or, preferably, by pressing intimate mixtures of optionally processed rock flour, for example, aluminum hydroxide (derived from bauxite) or quartz flour, and the polymeric binders and / or other additive components, preferably at high pressures and / or temperatures. They are frequently marketed under the name engineered stone, for example, under the trade names Dekton®, Corian®, Himacs®, or Silestone®.

[0098] For the purposes of this invention, stone-like materials also include ceramics and mineral glasses.

[0099] The thickness of the stone layer is ≤ 2 mm, preferably ≤ 1 mm, more preferably ≤ 0.5 mm, particularly preferably ≤ 0.3 mm, wherein this is a thickness averaged over the area of ​​the stone layer.

[0100] Leather is a prime example of a suitable animal hide product. It can be smooth or suede leather, for example, from cattle, calves, goats, or sheep. The leather can be produced using various tanning processes and can also undergo surface treatments. These methods are well-known to experts.

[0101] Wood laminate is defined as a thin sheet consisting of at least one layer of wood, which is separated from a log by peeling, slicing, or sawing (DIN 4079). Another possibility is the gluing of sawn timber lamellae into a block, which is then sliced.

[0102] Preferred wood veneers have a thickness in the range of 0.1 to 0.5 mm. Very thin veneers are prone to cracking, so processing requires particular care.

[0103] Preferably, the wood veneer comprises at least one layer of any wood species. Particularly preferred is a wood veneer from the following wood groups: maple, birch, tulipwood, cherry, ash, alder, beech, walnut, oak, sycamore, and mahogany.

[0104] The wood layer can be left natural or stained. The staining can be applied to the entire surface or only partially. The wood layer can create both visual and tactile effects.

[0105] In a preferred embodiment, layer (II) is a layer of material selected from the group consisting of animal hide products, textile fabrics containing synthetic fibers, material of plant origin or containing components of plant origin, or laminates containing one or more of the aforementioned materials; more preferably, a layer of material selected from the group consisting of textile fabrics containing synthetic fibers, material of plant origin or containing components of plant origin, or laminates containing one or more of the aforementioned materials; particularly preferably, a layer of material of plant origin or a laminate containing a material of plant origin; most preferably, a layer of natural wood, in particular a natural wood laminate.

[0106] Furthermore, layer (II) on the side facing away from the substrate layer can be treated by pickling, milling, impregnation, varnishing, applying colorants, or other techniques to alter the surface appearance or feel. These steps can be carried out on the finished multilayer body or on layer (II) before bonding it to the substrate material.

[0107] Alternatively, in a first specific embodiment, a decorative layer (II) that is only partially translucent can also be realized by using a layer of stone product, animal hide product, textile fabric containing synthetic fibers, material of plant origin or containing components of plant origin, or laminate containing one or more of the aforementioned materials, which, in its actual thickness, has a transmittance of at least 25%, more preferably at least 40%, and most preferably at least 50% at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum, which is measured according to the specifications in DIN / ISO 13468-2 in the 2006 version, on its side facing away from the visible side of the multilayer component, i.e.The side facing the carrier (I) made of thermoplastic material is coated, for example, with an opaque layer, such as a lacquer, and is printed, wherein this opaque layer has at least one recess (preferably in shapes as described above). In this first specific embodiment, during the production of the multilayer body according to the invention, the layer (II) thus produced is back-injected with the thermoplastic molding compound on the side provided with the opaque layer, so that the appearance of the stone product, animal hide product, textile fabric containing synthetic fibers, material of plant origin or containing components of plant origin, or laminate containing one or more of the aforementioned materials is retained on the visible side of the multilayer body.

[0108] Starting from the visible side, the multilayer body in this first special embodiment therefore contains in this order the decorative layer (II), the opaque layer (for example a lacquer) with at least one recess and the carrier layer (I).

[0109] In a second special embodiment, the decorative layer (II) (which has a transmittance of at least 25%, more preferably at least 40% and most preferably at least 50% at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum, which is measured in accordance with the specifications in DIN / ISO 13468-2 in the 2006 version)) is first overmolded with the carrier material to form the carrier layer (I) and then the carrier layer (I) is coated on the side facing away from the decorative layer (II) with an opaque layer, for example a varnish, for example printed, wherein this opaque layer has at least one recess.

[0110] Starting from the visible side, in this second special embodiment the multilayer body therefore contains in this order the decorative layer (II), the carrier layer (I) and the opaque layer (for example a lacquer) with at least one recess.

[0111] Layer (II) can be coated with a coating material on the side facing away from the substrate, i.e., the visible side. A coating is typically intended to provide mechanical protection against abrasion and scratching and / or protection against weathering, i.e., rain, temperature, and UV radiation. A specific surface texture or appearance can also be achieved with a coating.

[0112] Suitable coatings include, for example, thermally curing coating systems based on a polysiloxane lacquer, which can be either single-layer or multi-layer (with a primer layer that merely promotes adhesion between the substrate and the polysiloxane topcoat).

[0113] UV-curing coating systems, e.g. based on acrylate, urethane acrylate or acrylosilane, which may contain fillers to improve scratch resistance, can also be used. Production of the multilayer bodies

[0114] The multilayer bodies are preferably manufactured using the in-mold decoration (IMD) process. The IMD process is a special injection molding technique in which, prior to the injection of the molten plastic, optionally three-dimensionally pre-formed layers of the decorative layer (II) material are inserted into the injection mold. The process itself is well-known to those skilled in the art and is widely used.

[0115] The inserts are usually formed films, sheets, or other layers. Mechanical or non-contact thermoforming can be used for the forming process. For example, deep drawing is used. Other methods include vacuum thermoforming, pressing, or blow molding. For tighter positional tolerances, the well-known High Pressure Forming (HPF) process is used, as described, for example, in EP 2 197 656 B1. The films are generally trimmed after forming. Common methods such as punching, milling, blade cutting, laser cutting, and waterjet cutting can be used for this purpose.

[0116] In simplified terms, the following steps are carried out in the preferred method to produce the multilayer bodies according to the invention: a) Production of a layer from a material selected from the group consisting of stone, animal hide product, textile fabric containing synthetic fibers, material of plant origin or containing components of plant origin, or laminate containing one or more of the aforementioned materials, wherein the layer (II) has, at least in partial areas, a transmittance of at least 25%, preferably at least 40%, and most preferably at least 50% at least at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum measured in accordance with the specifications in DIN / ISO 13468-2 in the 2006 version, or wherein the layer (II) has a transmittance of less than 25% over the entire wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum.which is measured according to the specifications in DIN / ISO 13468-2 in the 2006 version, and wherein layer (II) has at least one recess in the form of at least one symbol, pattern, hole, line or character, or consists of point-shaped recesses arranged in the form of at least one symbol, pattern, hole, line or character, b) optionally thermoforming the layer produced in step a), c) back-injection of the layer with a thermoplastic molding compound as described above.

[0117] It is also possible for the three-dimensional deformation of the layer and the back injection molding to take place in a single injection mold. Such a simplified method is disclosed, for example, in WO 2014 / 044694 A1.

[0118] It is also possible that, after back-injection of the decorative layer (II) with the carrier material, a further layer of a thermoplastic material, preferably a transparent material, is applied in an overmolding process, so that this further layer seamlessly surrounds the surface of the component obtained after back-injection. The overmolding process is known to those skilled in the art and is described, for example, in publications WO 2012 / 069590 A1, EP2402140 A1 and DE 102007011338 A1. The carrier layer (I) preferably has a thickness of 0.5 to 5 mm, more preferably of 1.5 to 3.5 mm, and more preferably of 1.7 to 3.0 mm. This statement is to be understood as meaning that the carrier layer (I) has a thickness in these areas at every point of its extent, wherein carrier layer thicknesses of a maximum of 3.0 mm, more preferably a maximum of 2.5 mm, and particularly preferably a maximum of 2.2 mm are preferably used in the areas to be illuminated.The layer does not necessarily have the same thickness across the entire surface, but can also have different thicknesses, for example due to the formation of reinforcing ribs, the shape of the component, fastening structures, etc.

[0119] Further embodiments of the present invention are described below: 1. Multilayer body comprising (I) a carrier layer of a thermoplastic molding compound containing A) at least one representative selected from the group consisting of aromatic polycarbonate and aromatic polyester carbonate, B) rubber-modified vinyl(co)polymer of B.1) 80 to 95 wt.%, based on the rubber-modified vinyl(co)polymer B, structural units derived from at least one vinyl monomer, and B.2) 5 to 20 wt.%, based on the rubber-modified vinyl(co)polymer B, one or more rubber-elastic graft bases with glass transition temperatures < -50°C, determined by differential scanning calorimetry according to DIN EN 61006 in the 1994 version at a heating rate of 10 K / min with determination of the glass transition temperature as the midpoint temperature, containing at least 50 wt.%, based on B.2, of structural units derived from 1,3-butadiene,wherein the rubber-modified vinyl(co)polymer B (i) comprises a dispersed phase consisting of (i.1) rubber particles grafted with vinyl(co)polymer from structural units according to B.1 and (i.2) vinyl(co)polymer also from structural units according to B.1 enclosed in the rubber particles as a separate dispersed phase and (ii) a rubber-free vinyl(co)polymer matrix consisting of structural units according to B.1, not bound to or enclosed in the rubber particles, wherein the dispersed phase according to (i) has a mean diameter D50 measured by ultracentrifugation of 0.7 to 2.0 µm, c) optionally at least one further component selected from polymer additives and polymeric blend partners, wherein the thermoplastic molding compound contains less than 2 wt% of rubber-based graft polymers other than component B) and wherein the thermoplastic molding compound has a rubber content of at least 1,5 wt.%, and (II) a layer of a material selected from the group consisting of stone product, animal hide product, textile fabric containing synthetic fibers, material of plant origin or containing components of plant origin, or laminate containing one or more of the aforementioned materials, wherein the layer (II) has a transmittance of at least 25% at least in partial areas at its actual thickness there at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum which is measured in accordance with the specifications in DIN / ISO 13468-2 in the 2006 version, or wherein the layer (II) has a transmittance of less than 25% over the entire wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum,which is measured according to the specifications in DIN / ISO 13468-2 in the 2006 version, and wherein layer (II) has at least one recess in the form of at least one symbol, pattern, hole, line, or character, or consists of point-shaped recesses arranged in the form of at least one symbol, pattern, hole, line, or character. 2. Multilayer body according to embodiment 1, wherein the material of vegetable origin is natural wood, wood veneer, cork, paper, a cellulose product, or a textile fabric made of natural fibers. 3. Multilayer body according to embodiment 1 or 2, wherein the animal hide product is leather. 4. Multilayer body according to any of the preceding embodiments, wherein layer (II) comprises natural wood or a laminate containing natural wood. 5. Multilayer body according to any of the preceding embodiments,wherein the layer (II) has a transmittance of at least 40%, preferably at least 50%, at least in partial regions at its actual thickness at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum, which is measured according to the specifications in DIN / ISO 13468-2 in the 2006 version. 6. Multilayer body according to one of the preceding embodiments, wherein the thickness of the support layer is in the range of 0.5 to 5 mm. 7. Multilayer body according to one of the preceding embodiments, wherein the support layer contains 30 to 85 wt.% of component A, 14 to 69 wt.% of component B, and 0.05 to 20 wt.% of component C. 8. Multilayer body according to one of the preceding embodiments, wherein the support layer contains 50 to 82 wt.% of component A, 17 to 49 wt.% of component B, and 0.1 to 10 wt.% of component C. 9. Multilayer body according to any of the preceding embodiments, wherein the support layer contains 58 to 82 wt.% of component A, 17 to 41 wt.% of component B, and 0.2 to 5 wt.% of component C. 10. Multilayer body according to any of the preceding embodiments, wherein the support layer contains 65 to 75 wt.% of component A, 24 to 34 wt.% of component B, and 0.3 to 2 wt.% of component C. 11. Multilayer body according to any of the preceding embodiments, wherein the support layer contains less than 1 wt.% of rubber-based graft polymers other than component B. 12. Multilayer body according to any of the preceding embodiments, wherein the support layer contains less than 0.5 wt.% of rubber-based graft polymers other than component B. 13. Multilayer body according to any of the preceding embodiments, wherein the support layer contains no rubber-based graft polymers other than component B.14. Multilayer body according to any of the preceding embodiments, wherein the support layer has a rubber content in the range of 1.5 to 6 wt.%. 15. Multilayer body according to any of the preceding embodiments, wherein the support layer has a rubber content in the range of 1.8 to 5 wt.%. 16. Multilayer body according to any of the preceding embodiments, wherein the support layer has a rubber content of 1.9 to 4.1 wt.%. 17. Multilayer body according to any of the preceding embodiments, wherein the support layer has a rubber content in the range of 2.5 to 3.5 wt.%. 18. Multilayer body according to any of the preceding embodiments, wherein component A of the support layer is an aromatic polycarbonate based exclusively on bisphenol A. 19. Multilayer body according to any of the preceding embodiments,wherein component B of the support layer is produced by a bulk polymerization process. 20. Multilayer body according to any of the preceding embodiments, wherein component B) contains less than a total of 20 ppm alkali metal and alkaline earth metal ions. 21. Multilayer body according to any of the preceding embodiments, wherein the support layer consists of components A, B, and C. 22. Use of a thermoplastic molding compound comprising A) at least one member selected from the group consisting of aromatic polycarbonate and aromatic polyester carbonate, B) rubber-modified vinyl(co)polymer consisting of B.1) 80 to 95 wt.%, based on the rubber-modified vinyl(co)polymer B, structural units derived from at least one vinyl monomer, and B.2) 5 to 20 wt.%, based on the rubber-modified vinyl(co)polymer B, one or more rubber-elastic graft bases with glass transition temperatures < -50°C.Determined by differential scanning calorimetry according to DIN EN 61006 in the 1994 version at a heating rate of 10 K / min with determination of the glass transition temperature as the midpoint temperature, containing at least 50 wt.%, based on B.2, of structural units derived from 1,3-butadiene, wherein the rubber-modified vinyl(co)polymer B (i) comprises a dispersed phase consisting of (i.1) rubber particles grafted with vinyl(co)polymer from structural units according to B.1 and (i.2) vinyl(co)polymer also from structural units according to B.1 enclosed in the rubber particles as a separated dispersed phase and (ii) a rubber-free vinyl(co)polymer matrix consisting of structural units according to B.1, not bound to or enclosed in the rubber particles, wherein the dispersed phase according to (i) has a mean diameter D50 measured by ultracentrifugation of has a thickness of 0.7 to 2.0 µm,C) optionally at least one further component selected from polymer additives and polymer blend partners, wherein the thermoplastic molding compound contains less than 2 wt% of rubber-based graft polymers other than component B) and wherein the thermoplastic molding compound has a rubber content of at least 1.5 wt%, as a carrier layer in a multilayer body, wherein the multilayer body comprises the following components: (I) the carrier layer, (II) a layer of a material selected from the group consisting of stone product, animal hide product, textile fabric containing synthetic fibers, material of plant origin or containing components of plant origin, or laminate containing one or more of the aforementioned materials.wherein the layer (II) has a transmittance of at least 25% in at least partial areas at its actual thickness at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum measured in accordance with the specifications in DIN / ISO 13468-2 in the 2006 version, or wherein the layer (II) has a transmittance of less than 25% over the entire wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum measured in accordance with the specifications in DIN / ISO 13468-2 in the 2006 version, and wherein the layer (II) has at least one cutout in the form of at least one symbol, a pattern, a hole, a line or a character, or wherein the cutouts are point-shaped and in the form of at least one symbol, a pattern, a hole,23. Method for producing a multilayer body, comprising the steps a) producing a layer (II) from a material selected from the group consisting of stone, animal hide product, textile fabric containing synthetic fibers, material of vegetable origin or containing components of vegetable origin, or laminate containing one or more of the aforementioned materials, wherein the layer (II) has, at least in partial areas, a transmittance of at least 25% in its actual thickness there at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum which is measured in accordance with the specifications in DIN / ISO 13468-2 in the 2006 version, or wherein the layer (II) has a transmittance of less than 25% over the entire wavelength range of the spectrum from 380 to 780 nm,wherein the transmittance is determined from the transmittance spectrum, which is measured according to the specifications in DIN / ISO 13468-2 in the 2006 version, and wherein the layer (II) has at least one recess in the form of at least one symbol, pattern, hole, line or character, or consists of point-shaped recesses arranged in the form of at least one symbol, pattern, hole, line or character, b) optionally thermoforming the layer produced in step a), c) back-injection of the layer with a thermoplastic molding compound containing A) at least one representative selected from the group consisting of aromatic polycarbonate and aromatic polyester carbonate, B) rubber-modified vinyl (co)polymer of B.1) 80 to 95 wt.%, based on the rubber-modified vinyl (co)polymer B, structural units derived from at least one vinyl monomer and B.2) 5 to 20 wt.%,Based on the rubber-modified vinyl(co)polymer B, one or more rubber-elastic graft bases with glass transition temperatures < -50°C, determined by differential scanning calorimetry according to DIN EN 61006 in the 1994 version at a heating rate of 10 K / min with determination of the glass transition temperature as the midpoint temperature, containing at least 50 wt.%, based on B.2, of structural units derived from 1,3-butadiene, wherein the rubber-modified vinyl(co)polymer B (i) is a dispersed phase consisting of (i.1) rubber particles grafted with vinyl(co)polymer from structural units according to B.1 and (i.2) vinyl(co)polymer also from structural units according to B.1 enclosed in the rubber particles as a separated dispersed phase and (ii) a component not bound to or enclosed in the rubber particles rubber-free vinyl(co)polymer matrix consisting of structural units according to B.1 contains,wherein the dispersed phase according to (i) has a mean diameter D50 measured by ultracentrifugation of 0.7 to 2.0 µm, c) optionally at least one further component selected from polymer additives and polymeric blend partners, wherein the thermoplastic molding compound contains less than 2 wt.% of rubber-based graft polymers other than component B) and wherein the thermoplastic molding compound has a rubber content of at least 1.5 wt.%. 24. Illumination or display unit comprising a) a multilayer body according to any one of embodiments 1 to 21, b) a light source emitting light with at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the light source b) is arranged such that the support layer (I) of the multilayer body a) is irradiated by the light emitted by the light source b). 25. Illumination or display unit according to embodiment 24.where the light source b) is an LED light source. Examples Component A-1:

[0120] Linear polycarbonate based on bisphenol-A with a weight-averaged molecular weight MW of 24,000 g / mol (determined by GPC at room temperature in methylene chloride against a BPA-PC standard). Component A-2:

[0121] Linear polycarbonate based on bisphenol-A with a weight-averaged molecular weight MW of 28,000 g / mol (determined by GPC at room temperature in methylene chloride against a BPA-PC standard). Component B-1 :

[0122] Acrylonitrile(A)-butadiene(B)-styrene(S) polymer, produced by bulk polymerization, comprising a dispersed phase of rubber particles grafted with styrene-acrylonitrile copolymer based on a polybutadiene rubber as the graft base, containing styrene-acrylonitrile copolymer as a separated dispersed phase, and a styrene-acrylonitrile copolymer matrix that is not chemically bonded to or embedded within the rubber particles. Component B-1 has an A:B:S ratio of 23:10:67 wt% and a gel content, determined as the fraction insoluble in acetone, of 20 wt%. The acetone-soluble fraction of component B-1 has a weight-average molecular weight Mw (measured by GPC in tetrahydrofuran as solvent with polystyrene as standard) of 165 kg / mol. The mean particle size of the dispersed phase D50, measured by ultracentrifugation, is 0.85 µm.The melt flow rate (MVR) of component B-1, measured according to ISO 1133 (version of 2012) at 220°C with a stamp load of 10 kg, is 6.7 ml / 10 min. Component B-2:

[0123] Acrylonitrile(A)-butadiene(B)-styrene(S)-n-butylacrylate(BA) polymer, produced by bulk polymerization, comprising a dispersed phase of rubber particles grafted with styrene-acrylonitrile-n-butylacrylate terpolymer based on polybutadiene rubber as the graft base, containing styrene-acrylonitrile-n-butylacrylate terpolymer as a separated dispersed phase, and a styrene-acrylonitrile copolymer matrix not chemically bonded to or contained within the rubber particles. Component B-2 has an A:B:S:BA ratio of 22.5:10:63:4.5 wt% and a gel content, determined as the acetone-insoluble fraction, of 19 wt%. The acetone-soluble fraction of component B-2 has a weight-averaged molecular weight M w (measured by GPC in tetrahydrofuran as solvent with polystyrene as standard) of 115 kg / mol.The mean particle size of the dispersed phase D50, measured by ultracentrifugation, is 0.50 µm. The melt flow rate (MFR) of component C-1, measured according to ISO 1133 (2012 version) at 220°C with a stamping load of 10 kg, is 28 g / 10 min. Component B-3

[0124] Acrylonitrile butadiene styrene graft polymer with a core-shell structure, produced by emulsion polymerization of 43 wt% (based on the ABS polymer) of a mixture of 27 wt% acrylonitrile and 73 wt% styrene in the presence of 57 wt% (based on the ABS polymer) of a particle-crosslinked polybutadiene rubber as a graft base. This polybutadiene rubber graft base exhibits a bimodal particle size distribution with maxima at 0.28 µm and 0.40 µm and a mean particle size D50, measured by ultracentrifugation, of 0.35 µm.

[0125] Component B-3 does not contain styrene-acrylonitrile copolymer encapsulated in the rubber particles. Component B-4

[0126] Acrylonitrile butadiene styrene graft polymer with a core-shell structure, produced by emulsion polymerization of 42 wt% (based on the ABS polymer) of a mixture of 26 wt% acrylonitrile and 74 wt% styrene in the presence of 58 wt% (based on the ABS polymer) of an agglomerated particulate polybutadiene rubber as a graft base. This polybutadiene rubber graft base exhibits a significantly broader and monomodal particle size distribution compared to the graft base used in component B-3. However, the mean particle size D50, measured by ultracentrifugation, is in a similar range to component B-3 at 0.38 µm.

[0127] Component B-4 does not contain styrene-acrylonitrile copolymer encapsulated in the rubber particles. Component B-5

[0128] Styrene-acrylonitrile copolymer, produced by mass polymerization, with an acrylonitrile content of 23 wt.% and with a weight-averaged molecular weight M w of 100,000 Da measured by GPC at room temperature in tetrahydrofuran with polystyrene as standard. Component C1:

[0129] Pentaerythritol tetrastearate Component C-2:

[0130] Irganox™< B900 (BASF, Ludwigshafen, Germany) mixture of 80 wt% Tris(2,4-di-tert-butyl-phenyl)-phospit (Irgafos™< 168) and 20 wt% 2,6-Di-tert-butyl-4-(octadecanoxycarbonylethyl)phenol (Irganox™< 1076) Component C3:

[0131] Irganox™< 1076 (BASF, Ludwigshafen, Germany) 2,6-Di-tert-butyl-4-(octadecanoxycarbonylethyl)phenol Production and testing of the molding compounds according to the invention

[0132] The molding compounds were produced on a twin-shaft extruder ZSK25 from Coperion, Werner & Pfleiderer (Stuttgart, Germany) at a melt temperature of 260°C and under a vacuum of 100 mbar (absolute).

[0133] The test specimens were produced on an Arburg 270 E injection molding machine at a melt temperature of 260°C and a tool temperature of 80°C.

[0134] The melt viscosity was determined at a temperature of 260°C and a shear rate of 1000 s -1< according to ISO 11443 (version of 2014).

[0135] The IZOD impact strength was determined at temperatures ranging from -50°C to 23°C on test specimens measuring 80 mm x 10 mm x 4 mm according to ISO 180 / 1A (2013 version). From measurements at different temperatures, the tough-brittle transition temperature was determined as the temperature at which 50% of the specimens in the test exhibit brittle fracture and 50% tough fracture.

[0136] To assess material ductility under multiaxial loading at low temperatures, a puncture test according to ISO 6603-2 (2002 version) was performed at -20°C on ten specimens each, measuring 60 mm x 60 mm x 2 mm. The percentage of brittle fractures serves as a measure of material ductility under multiaxial loading. A brittle fracture is defined as a fracture failure in which parts of the specimen splinter and break away during the puncture test and / or the specimens exhibit unstable crack propagation, causing the specimen to completely break into two pieces along such a crack during the test.

[0137] The modulus of elasticity E and the elongation at break were determined on shoulder bars of dimensions 170 mm x 10 mm x 4 mm at 23°C according to ISO 527 (version of 1996) with a strain rate of 1 mm / min (modulus of elasticity) and 5 mm / min (elongation at break).

[0138] The softening temperature Vicat B / 120 is determined as a measure of heat resistance on test bars of dimensions of 80 mm x 10 mm x 4 mm according to ISO 180 / 1A (version of 2014).

[0139] The total transmittance was determined according to ISO 13468-2 (version of 2006) (light source: D65, observer: 10°) on test specimens with dimensions of 60 mm x 40 mm x 2 mm (i.e., with a material thickness of 2 mm) as a measure of the translucency.

[0140] The half-value angle (HPA) of light intensity was used as a measure of light diffusivity. Larger half-value angles indicate greater light scattering. To determine the half-value angle, the intensity of the light after illuminating a test specimen with dimensions of 60 mm x 40 mm x 2 mm (i.e., with a material thickness of 2 mm) is measured as a function of the polar angle relative to the incident light beam in the range of 0° to 90°. The obtained values ​​are normalized to the intensity value measured at an angle of 0°, so that the normalized intensity varies between 0 and 1 as a function of the polar angle θ, with I(0°) = 1. The half-value angle (HPA) is defined as the angle at which the normalized intensity has decreased to 0.5, i.e., I(HPA) = 0.5. With this definition, the theoretically maximum possible half-value angle is 60°. Table 1: Compositions and their properties component 1 V2 V3 V4 V5 V6 7 8 V9 10 11 12 V13 A-1 80 80 80 80 80 80 60 70 90 A-2 60 70 80 90 B-1 20 40 30 10 40 30 20 10 B-2 20 B-3 5 2,5 B-4 5 2,5 B-5 15 17,5 15 17,5 C-1 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,5 C-2 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 C-3 0,2 0,2 0,2 0,2 0,2 0,2 0,2 0,2 0,2 0,2 0,2 0,2 0,2 Calculated size Rubber content in the composition [wt%] 2,0 2,0 2,8 1,4 2,9 1,4 4,0 3,0 1,0 4,0 3,0 2,0 1,0 Characteristics Transmission [%] 52 46 46 51 44 49 47 49 60 46 48 52 58 Half-value angle [°] 50 24 3 2 34 2 57 55 2 56 55 50 2 Melt viscosity [Pas] 248 200 228 213 228 225 174 202 312 204 230 293 454 Impact strength at -30°C [kJ / m²< ] 21 16 15 10 15 9 20 24 13 43 43 27 13 Viscous-brittle transition temperature [°C] 0 10 15 >23 15 >23 -15 -25 >23 -45 -35 -25 >23 Puncture test [% brittle fracture] 70 100 100 100 70 70 90 50 20 0 0 80 80 E-module 2325 2426 2432 2529 2410 2524 2289 2307 2341 2273 2310 2348 2356 Elongation at break 60 101 54 57 59 52 62 59 53 53 85 94 86 Vicat B120 135 134 135 134 135 134 124 131 138 123 131 136 138

[0141] The data in Table 1 show that the molding compounds according to the invention, which contain component B-1 according to the invention as component B and whose polybutadiene rubber content is within the range specified by the invention, exhibit a surprisingly advantageous combination of high light transmission and high light diffusivity (scattering power). Furthermore, the molding compounds according to the invention show an advantageous combination of improved melt flowability (reduced melt viscosity) and good mechanical properties, in particular good material toughness even at low temperatures. In contrast, the molding compounds not according to the invention, which contain the non-inventive emulsion ABS components B-3 or B-4 or a non-inventive bulk ABS component B-2 as component B, do not fulfill this technical objective of the invention.The same applies to the molding compounds made from compositions V9 and V13, which, with regard to their polybutadiene rubber content, are outside the scope of the invention. Production and evaluation of multilayer bodies Multilayer body 1 (comparison)

[0142] For the production of the carrier (I), Makrolon®< Ai type from Covestro Deutschland AG (Leverkusen, Germany) was used. This is an aromatic polycarbonate based on bisphenol A with a MVR of 19 cm³ / (10 min), determined at 300 °C and a 1.2 kg injection mold load according to DIN ISO 1133:2012-03, containing UV absorber and demolding agent. Before injection molding, the Makrolon®< was dried for 4 hours at 120 °C in dry air.

[0143] The decorative layer (II) consisted of wood veneers from Microwood ®< (Liedekerke, Belgium) with a thickness of approximately 0.1 mm, which were pre-cut to the shape of the multi-layer body according to Figure 1The parts were cut to size and additionally provided with three holes at each end to allow the veneers to be attached to holding pins and secured in the injection mold. The multi-layer body measures 400 mm x 120 mm x 4 mm. The circular area in the left part of the multi-layer body according to Figure 1 This is the gate area of ​​the injection-molded carrier layer (I). A spot gate with hot runner was used.

[0144] The two-layer, multi-layer bodies were then produced on an injection molding machine of type KM GX400 from the company KraussMaffei Group GmbH (Munich, Germany) using wood veneer as a decorative layer (II) and a carrier (I) made of the aforementioned Makrolon ®<.

[0145] In the first step, a wood veneer was placed onto the holding pin in the first half of a steel mold. After closing the mold, transparent Makrolon®, melted at 300 °C, was injected into the mold onto the wood veneer at a maximum specific injection pressure of approximately 1500 bar. The mold wall temperature was 90 °C on both the ejector side and the opposite injection side. The injection time was 4 seconds. After a holding pressure of 15 seconds (specific holding pressure: 700 bar) and a cooling time of 40 seconds, the mold was opened and the molded part removed. These injection molding conditions were optimized to ensure the mold was completely filled during injection molding, resulting in the best possible appearance of the manufactured multi-layered part. Multilayer body 2 (Example according to the invention)

[0146] For the production of the carrier (I), the molding compound was selected according to the composition of Example 11 in Table 1. Before injection molding, the granules of the PC / ABS molding compound according to the invention were dried for 4 hours at 105 °C in dry air.

[0147] In contrast to the comparison example (production of multilayer body 1), after closing the mold, the PC / ABS molding compound, melted at 270 °C, was injected into the mold onto the wood veneer at a maximum specific injection pressure of approximately 1350 bar. The mold wall temperature was 80 °C on both the ejector side and the opposite injection side. The injection time was again 4 seconds. After a holding pressure of 15 seconds (specific holding pressure: 600 bar) and a cooling time of 40 seconds, the mold was opened and the molded part removed. The injection molding conditions described above were also optimized in this example to ensure that the mold was completely filled during injection molding and that the resulting multilayer body had the best possible appearance.

[0148] The wood veneer of multilayer body 1 (comparative example) showed a blister-like detachment (radius approx. 1 cm) from the substrate in the area of ​​the point sprue, caused by deformation of the wood veneer due to the locally increased thermal load. This undesirable effect did not occur in multilayer body 2 (example according to the invention).

[0149] Both multilayer bodies 1 and 2 proved to be diffusely translucent with high luminous efficacy when illuminated with a smartphone LED. However, while a homogeneous, uniformly diffuse transillumination pattern was observed in the multilayer body 2 according to the invention, the sprue area was disturbingly and undesirably visible when transilluminated on the visible side of multilayer body 1 (comparison).

Claims

1. Multilayer article comprising (I) a carrier layer composed of a thermoplastic moulding compound containing A) at least one representative selected from the group consisting of aromatic polycarbonate and aromatic polyester carbonate, B) rubber-modified vinyl (co)polymer composed of B.1) 80% to 95% by weight, based on the rubber-modified vinyl (co)polymer B, of structural units derived from at least one vinyl monomer and B.2) 5% to 20% by weight, based on the rubber-modified vinyl (co)polymer B, of one or more elastomeric graft substrates having glass transition temperatures < -50°C determined by differential scanning calorimetry according to DIN EN 61006, 1994 version, at a heating rate of 10 K / min with determination of the glass transition temperature as a midpoint temperature and containing at least 50% by weight based on B.2 of structural units derived from 1,3-butadiene, wherein the rubber-modified vinyl (co)polymer B contains (i) a disperse phase consisting of (i.1) rubber particles grafted with vinyl (co)polymer composed of structural units of B.1 and (i.2) vinyl (co)polymer likewise composed of structural units of B.1 enclosed in the rubber particles as a separate disperse phase and (ii) a rubber-free vinyl (co)polymer matrix consisting of structural units of B.1 which is not bonded to the rubber particles and is not enclosed in these rubber particles, wherein the disperse phase of (i) has a median diameter D50 measured by ultracentrifugation of 0.7 to 2.0 µm, C) optionally at least one further component selected from polymer additives and polymeric blend partners, wherein the thermoplastic moulding compound contains less than 2% by weight of rubber-based graft polymers distinct from component B) and wherein the thermoplastic moulding compound has a rubber content of at least 1.5% by weight, and (II) a layer of a material selected from the group consisting of stone product, animal hide product, textile fabric containing synthetic fibres, material of vegetable origin or containing constituents of vegetable origin or laminate containing one or more of the recited materials, wherein the layer (II) at least in subregions at its actual local thickness at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm has a transmittance of at least 25%, wherein the transmittance is determined from the transmission spectrum measured according to the specifications in DIN / ISO 13468-2, 2006 version, or wherein the layer (II) has a transmittance of less than 25% in the entire wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum measured according to the specifications in DIN / ISO 13468-2, 2006 version, and wherein the layer (II) comprises at least one cutout in the shape of at least one symbol, one pattern, one hole, one line or one character or comprises punctate cutouts arranged in the shape of at least one symbol, one pattern, one hole, one line or one character.

2. Multilayer article according to Claim 1, wherein the material of vegetable origin is a natural wood, cork, paper, cellulose product or textile fabric made of natural fibres.

3. Multilayer article according to Claim 1 or 2, wherein the animal hide product is a leather.

4. Multilayer article according to any of the preceding claims, wherein layer (II) comprises a natural wood or a laminate containing a natural wood.

5. Multilayer article according to any of the preceding claims, wherein the thickness of the carrier layer is in the range from 0.5 to 5 mm.

6. Multilayer article according to any of the preceding claims, wherein the carrier layer contains 30% to 85% by weight of component A, 14% to 69% by weight of component B, and 0.05% to 20% by weight of component C.

7. Multilayer article according to any of the preceding claims, wherein component B) contains less than a sum total of 20 ppm of ions of alkali metals and alkaline earth metals.

8. Multilayer article according to any of the preceding claims, wherein the carrier layer is free from rubber-based graft polymers distinct from component B).

9. Multilayer article according to any of the preceding claims, wherein the carrier layer has a rubber content of 2.5% to 3.5% by weight.

10. Multilayer article according to any of the preceding claims, wherein component B) of the carrier layer is produced by a bulk polymerization process.

11. Multilayer article according to any of the preceding claims, wherein the carrier layer consists of the components A, B and C.

12. Use of a thermoplastic moulding compound containing A) at least one representative selected from the group consisting of aromatic polycarbonate and aromatic polyester carbonate, B) rubber-modified vinyl (co)polymer composed of B.1) 80% to 95% by weight, based on the rubber-modified vinyl (co)polymer B, of structural units derived from at least one vinyl monomer and B.2) 5% to 20% by weight, based on the rubber-modified vinyl (co)polymer B, of one or more elastomeric graft substrates having glass transition temperatures < -50°C determined by differential scanning calorimetry according to DIN EN 61006, 1994 version, at a heating rate of 10 K / min with determination of the glass transition temperature as a midpoint temperature and containing at least 50% by weight based on B.2 of structural units derived from 1,3-butadiene, wherein the rubber-modified vinyl (co)polymer B contains (i) a disperse phase consisting of (i.1) rubber particles grafted with vinyl (co)polymer composed of structural units of B.1 and (i.2) vinyl (co)polymer likewise composed of structural units of B.1 enclosed in the rubber particles as a separate disperse phase and (ii) a rubber-free vinyl (co)polymer matrix consisting of structural units of B.1 which is not bonded to the rubber particles and is not enclosed in these rubber particles, wherein the disperse phase of (i) has a median diameter D50 measured by ultracentrifugation of 0.7 to 2.0 µm, C) optionally at least one further component selected from polymer additives and polymeric blend partners wherein the thermoplastic moulding compound contains less than 2% by weight of rubber-based graft polymers distinct from component B) and wherein the thermoplastic moulding compound has a rubber content of at least 1.5% by weight, as a carrier layer in a multilayer article, wherein the multilayer article comprises the following components: (I) the carrier layer, (II) a layer of a material selected from the group consisting of stone product, animal hide product, textile fabric containing synthetic fibres, material of vegetable origin or containing constituents of vegetable origin or laminate containing one or more of the recited materials, wherein the layer (II) at least in subregions at its actual local thickness at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm has a transmittance of at least 25%, wherein the transmittance is determined from the transmission spectrum measured according to the specifications in DIN / ISO 13468-2, 2006 version, or wherein the layer (II) has a transmittance of less than 25% in the entire wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum measured according to the specifications in DIN / ISO 13468-2, 2006 version, and wherein the layer (II) comprises at least one cutout in the shape of at least one symbol, one pattern, one hole, one line or one character or comprises punctate cutouts arranged in the shape of at least one symbol, one pattern, one hole, one line or one character.

13. Process for producing a multilayer article comprising the steps of a) producing a layer of a material selected from the group consisting of stone, animal hide product, textile fabric containing synthetic fibres, material of vegetable origin or containing constituents of vegetable origin or laminate containing one or more of the recited materials, wherein the layer at least in subregions at its actual local thickness at at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm has a transmittance of at least 25%, wherein the transmittance is determined from the transmission spectrum measured according to the specifications in DIN / ISO 13468-2, 2006 version, or wherein the layer has a transmittance of less than 25% in the entire wavelength range of the spectrum from 380 to 780 nm, wherein the transmittance is determined from the transmission spectrum measured according to the specifications in DIN / ISO 13468-2, 2006 version, and wherein the layer (II) comprises at least one cutout in the shape of at least one symbol, one pattern, one hole, one line or one character or comprises punctate cutouts arranged in the shape of at least one symbol, one pattern, one hole, one line or one character, b) optionally thermoforming the layer produced in step a), c) subjecting the layer to film-insert moulding with a thermoplastic moulding compound containing A) at least one representative selected from the group consisting of aromatic polycarbonate and aromatic polyester carbonate, B) rubber-modified vinyl (co)polymer composed of B.1) 80% to 95% by weight, based on the rubber-modified vinyl (co)polymer B, of structural units derived from at least one vinyl monomer and B.2) 5% to 20% by weight, based on the rubber-modified vinyl (co)polymer B, of one or more elastomeric graft substrates having glass transition temperatures < -50°C determined by differential scanning calorimetry according to DIN EN 61006, 1994 version, at a heating rate of 10 K / min with determination of the glass transition temperature as a midpoint temperature and containing at least 50% by weight based on B.2 of structural units derived from 1,3-butadiene, wherein the rubber-modified vinyl (co)polymer B contains (i) a disperse phase consisting of (i.1) rubber particles grafted with vinyl (co)polymer composed of structural units of B.1 and (i.2) vinyl (co)polymer likewise composed of structural units of B.1 enclosed in the rubber particles as a separate disperse phase and (ii) a rubber-free vinyl (co)polymer matrix consisting of structural units of B.1 which is not bonded to the rubber particles and is not enclosed in these rubber particles, wherein the disperse phase of (i) has a median diameter D50 measured by ultracentrifugation of 0.7 to 2.0 µm, C) optionally at least one further component selected from polymer additives and polymeric blend partners, wherein the thermoplastic moulding compound contains less than 2% by weight of rubber-based graft polymers distinct from component B) and wherein the thermoplastic moulding compound has a rubber content of at least 1.5% by weight.

14. Lighting or display unit comprising a) a multilayer article according to any of Claims 1 to 11 and b) a light source emitting light having at least one wavelength in the wavelength range of the spectrum from 380 to 780 nm, wherein the light source b) is arranged such that the carrier layer (I) of the multilayer article a) is trans illuminated by the light emitted by the light source b).

15. Lighting or display unit according to Claim 14, wherein the light source b) is an LED light source.