WO2018220083A1

WO2018220083A1 - Compound

Info

Publication number: WO2018220083A1
Application number: PCT/EP2018/064298
Authority: WO
Inventors: Bjoern OTTO; Jan Erik FÖRSTER
Original assignee: Albis Plastic Gmbh
Priority date: 2017-06-01
Filing date: 2018-05-30
Publication date: 2018-12-06
Also published as: DE102017209357A1

Abstract

The invention relates to a compound and the use thereof, wherein the compound comprises at least one matrix material selected from the group formed by polymer blends, homopolymers, copolymers, elastomers and thermosetting polymers, and at least one filling material filling material embedded in the matrix material after the processing of the compound, and wherein the compound is characterised in that the filling material has a core and a first casing material at least partially encasing the core, wherein a portion of the filling material in the compound is at least one portion enabling formation via percolation, and wherein an electrical conductivity as a first property, as well as at least one second property of a plastic produced from the compound is influencing the filling material.

Description

compound

The present invention relates to a compound in the unprocessed state with in many respects increased functionality, in particular also the conductivity. It has long been an objective of compound development to change the properties of the plastics produced later from these by the addition of additives and to adapt them to the respective intended use of the plastic, with one additive each having a specific one

Property of the later plastic specifically changed. For the later technical application of the compounds are such additives of great interest, which after processing of

Compounds electrically and thermally conductive plastics

Polymer blends result.

Friction on bodies causes charging. Plastics that have a sufficiently low surface resistance ensure that, on the one hand, the amount of charging voltage is minimized and, on the other, that the electrostatic charge can be reduced again. The Ableitwiderstand, or the Abklingverhalten, of bodies made of such plastics ensures that electrostatic charges drain against the ground reference potential and thus can not cause unacceptably high charges that otherwise

Voltage breakdown - even in the form of sparks - lead. These short-term high electrical currents can damage electrical components in equipment right through to fire and electrical equipment

Danger of explosion in appropriate environment. Protection against such electrostatic discharges is provided by plastics which are static-dissipative and which have surface resistances in the range between 100 kQ according to DIN EN 61340-5-1 and 100 GQ, ie between 1 E5 and 1 E1 1 Ohms. Even higher surface resistances are present in insulators that are no longer suitable for ESD protection. However, there is a transition range up to about -5 ohms, in which the compound is actually too high

Has surface resistances, made of it body, however, show a decay behavior, so charge on one way or another flow away from the body or the charge only slightly by friction. The assessment and assessment of such measurement results requires experience and should therefore always be both the

Capture surface resistances as well as the decay behavior.

As technical applications of such static dissipative compounds come in particular technical equipment manufacturing and

Processing of plastic films, paper, textiles and glass as well as production machines for electrically insulating

Endless products, equipment for handling insulating bulk materials, protective clothing for workers working in ESD areas

People, antistatic work surfaces, floor coverings, conductive covers or even components in the automotive sector.

To influence the electrical conductivity of the later,

processed compounds, it is previously known from the prior art to add individual additives to the compound, each of which specifically changes a certain property of the later plastic. For example, the setting of the electrical

Conductivity with regard to the electrostatic Abieitfähigkeit of

Plastic over adding intrinsically conductive polymers such

For example, polyaniline, polypyrrole, polythiophene, iodine doped

Polyacetylene, polyethylene oxide, block-copolymerized fatty acid esters with a polyamide / polyether block amide matrix but also via the addition of high molecular weight polar molecules with a molecular weight <3000 g / mol, by adding natural and synthetic graphite or carbon black, metals such as silver powder or by adding carbon / steel fibers. Graphite or conductive carbon black is used particularly frequently for high electrical conductivity and thus for static dissipative plastics. Additionally or alternatively, it is also known to achieve lower surface resistances by the application of an antistatic agent on the surface compared to unmodified plastics.

A shield against electromagnetic radiation has been achieved by the addition of steel fibers. An adjustment of the thermal conductivity was made by a high proportion of carbon black in the compound.

So far, additives such as minerals, glass and carbon fibers have been added to mechanical reinforcement of plastics, with carbon fibers also increasing the electrical conductivity of the processed compound component.

An antimicrobial effect is enhanced by the addition of powders containing silver ions.

Finally, an increased scratch resistance has hitherto been achieved by the addition of platelet-shaped minerals or by siloxanes-modified polyesters.

If the skilled person wants to adjust several properties of the later plastic at the same time, he must add a variety of additives, but these are usually not present in any ratio to each other and are not arbitrarily combinable with each other. From DE 10 2015 207 814 A1 is an electrically conductive

Polymer composition comprising a matrix polymer and electrically conductive particles and a liquid salt, which together make up 65% by weight of the composition. The

The ratio of matrix polymer to particles is between 4: 1 and 1: 5, where the particles are silver-coated copper particles or silver-coated glass bubbles, silver-coated glass fibers or silver-coated nickel particles and the matrix polymer can be an SBS. From DE 10 2017 200 448 A1, a conductive Polymercomposit is known, in which a thermoplastic polymer and metal-coated carbon nanotubes ^(CNT's) are present in a proportion of 10 wt .-%. Copolymers are described which contain, in particular, polymers selected from the polyacrylates, carbonates, esters, amides, ABS and others.

From WO 2007/096479 A1 is a conductive thermoplastic

Composition is known, which has CNT ^'s in a percolation sufficient portion, wherein a dispersant in the form of a substituted aromatic compound is present in a proportion which leads to an electrical conductivity of more than 10-8 S / cm. The very specific dispersant should be able to bind to a polyanniline with non-covalent bonding according to this teaching.

The properties of a later compound depend significantly on the matrix, one and the same filler can lead to different properties of the later compound with different dies, these depend in particular on how the filler is distributed in the matrix, for example, homogeneous, near the surface, netwerkartig, or in clusters, its ability to embed in the respective matrix and other more. The amount of filler necessary to achieve a percolation is therefore difficult to determine and not immediately apparent.

The present invention therefore solves the problem of providing a compound that avoids these disadvantages. It further solves the task of specifying a use of this compound.

The material object is in a compound comprising at least one matrix selected from the group formed by polymer blends, homopolymers, copolymers, elastomers or thermosetting polymers and at least one, after processing of the compounds in the

Matrix filler embedded filler solved in that the filler has a core and a first, at least partially enveloping the core first shell material, wherein a proportion of the filler on the compound at least one perkolationsbildung empowering share and wherein the first shell material has an electrical conductivity as a first property and at least a second property of a plastic produced from the compound is influencing.

The compound of the invention has at least one filler, which consists of a core and at least one shell and in addition to the electrical conductivity and at least one further property of a plastic produced from the compounds according to the invention is influencing. As a result, a reduction in the number of fillers is achieved with great advantage, which must be used to achieve the desired properties of a produced from the compound plastic. This can be problems and

Reduce imperfections in terms of miscibilities and mixing proportions of different fillers and save costs. With great advantage can be achieved with the compound of the invention by order on components to be shielded layer thicknesses of 2 mm on these components, which is particularly important for a safe EM shielding. In addition to the described filler, the compound according to the invention can readily also contain further fillers which supplement 100% by weight with the claimed filler type and the matrix, but it is also according to the invention if only the claimed filler is contained and becomes attached to the matrix 100% by mass added. In particular, already filled matrix materials according to the invention, ie those which themselves contain fillers, for example glass fiber, carbon fiber, minerals, steel fibers, etc.

The multi-layered nature of the filler leads to an increase in the number of properties of the later plastic which can be influenced by it, one of which is always its electrical conductivity according to the invention. The filler content of the compound is so high that it has a

Perkolation allows, so a clustering and thus the formation of contiguous Fülllstoffgebieten at random

Occupy structures of the matrix, for example as a point or edge percolation. In point percolation, grid points of the matrix are occupied with a certain probability, in which

Edge Percolation, filler-occupied points of the matrix are interconnected. The groups (= clusters) of occupied fields within the structure of the matrix in the immediate vicinity will be larger, the greater the probability of occupying a field by the filler. The probability probably also depends on the respective chemical properties of matrix and filler, so probably not every matrix with each filler would lead to corresponding percolation. Percolation produces the properties of a compound made from the compound

Plastic object over its entire spatial extent influenced in the same way, so that there is a homogeneous in its properties object.

The second property influenced by the filler is selected from the properties: thermal conductivity, heat capacity, modulus of elasticity and related impact strength, scratch resistance,

antibacterial activity, color and melt volume rate of the compound. The proportion of the filler in the unprocessed state of the compound according to the invention is between 1 mass% and 49 mass%, in particular between 1 mass% and 35 mass%, more preferably between 1 mass% and 31 mass%, and most preferably and according to the invention between 1 mass% and 20 mass%. With these high levels of the effect of the invention is achieved particularly well. At the current price level, a proportion of between 1% by mass and 16% by mass is particularly economical and still realizes the advantages of the invention to a very satisfactory degree. With regard to the matrix substances mentioned according to the invention, the homopolymer matrix material is selected from styrene-based

Homopolymers such as GPPS (general-purpose polystyrene), HIPS (high-impact polystyrene) and the copolymer matrix material selected from the styrene-based copolymers SBC (styrene-butadiene copolymer), SMMA (styrene-methyl methacrylate); MABS

(Methyl methacrylate acrylonitrile butadiene styrene), MBS

(Methyl methacrylate butadiene styrene), AMSAN (alpha methylstyrene acrylonitrile), SAN (styrene acrylonitrile), ABS (acrylonitrile-butadiene styrene) and ASA

(Acrylic n itri istyrol acrylate).

With regard to the aforementioned matrix substances which are possible according to the invention, the polymer blend matrix material is selected from the styrene-based copolymers + PA mentioned in the preceding paragraph or from the styrene-based copolymers + polyester mentioned in the preceding paragraph, wherein the polyester is preferably a polycarbonate and the polymer blend is very particularly preferred a PC + ABS is.

The special radially multi-layered fillers used according to the invention are unquestionably also in each case in the components of the in the

Polymer blends used can be used alone, so that the matrix material according to the invention can also be readily a polycarbonate and thus more generally a polyester. It may also be a styrene-based copolymer, and more generally, it may also be a non-styrene-based copolymer.

In addition to these suitable matrix materials, it is particularly advantageous if the core of the filler is selected from the group formed by

Metals, in particular copper or aluminum, ceramics, in particular silicon oxide, also in the form of glass, or titanium oxide and carbon in nanotube structure. These core materials advantageously improve the electrical conductivity as the first property of a plastic, while at the same time allowing the influence of a second

Property of the plastic, for example its color,

Scratch resistance and more. The first shell material is selected according to the invention from the group formed by metals, in particular silver, ceramics, in particular a metal oxide, carbon, in particular in nanotube structure. This results in accordance with the invention a whole series of

Combinations for the filler structure, in particular metal-coated metals and metal-coated glass, with glass as metal oxide.

Especially in the case of carbon nanotubes, the core and the first shell are of the same chemical nature, the same applies to the

Combination of metallic core and metallic shell. However, a combination of chemically dissimilar materials of core and shell according to the invention, for example, a metallic core and a ceramic shell or vice versa. Likewise the combination of several inventive fillers in a compound.

It is further provided that the filler has at least one, the first envelope at least partially enveloping, second envelope, which is preferably carbon nanotube form. Especially with the latter, a three- or multi-layered construction is advantageous. As already explained, it is also according to the invention that the first shell material and the second shell material are differently formed in their chemical nature.

The filler according to the invention is fibrous, plate-shaped, spherical or gritty. These forms are sufficiently stable to survive the compounding process and compound processing process in a property-preserving manner, while being particularly well-suited for percolation.

The compound according to the invention may also contain an already filled matrix substance which, in particular with glass fibers,

Carbon fibers, steel fibers, minerals is filled. These therefore do not belong to the fillers according to the invention and their mass fraction. Such a compound is for the production of parts by Urformung from a plastic state, in particular for the production of compression molding, injection molding, injection molding, extrusion, Ziehform-, calendering and

Blow moldings ideally suited. embodiments

The following embodiments are in tables

summarized, the first two tables reference examples and inventive examples with a first base composition and the third and subsequent table examples of the invention with a second base composition. In particular, the fifth and subsequent table also contains examples according to the invention of second basic composition and in each case a combination of a plurality of fillers according to the invention.

Examples with First Base Composition The first basic composition consists of

Polycarbonate / acrylonitrile-butadiene-styrene (unfilled Bayblend T65 XF (about 65% by mass of polycarbonate, 35% by mass of acrylonitrile-butadiene styrene), eXtreme Flow Type, Covestro AG), hereinafter referred to as PC + ABS (weight 10,000 g) and an antioxidant (Irgafos 168 (phosphorous acid, tris (2,4-di-tert-butylphenyl) ester, CAS No. 31570-04-4, BASF SE) or Songnox 1680 PW (tris (2,4-di-tert-butyl) butylphenyl) phosphite, CAS No. 31570-04-4, Songwon International AG), hereinafter also referred to as antioxidant (weighed 10 g) and

- A white pigment of titanium dioxide (100 g weight). PC + ABS is a polymer blend known as

Plastic matrix for one or more fillers is used. The white pigment is used to whiten the PC + ABS and the antioxidant protects the PC + ABS from thermal damage. That also in the context of

PC + ABS used was in granular form.

For the production of all listed in the following tables

Compositions according to the prior art and after

Invention, the following steps were performed:

1. Weighing the base materials PC + ABS, antioxidant and white pigment of the first base composition so that, according to the above composition tables, granules of 101.10 g each could be used. Correspondingly modified ingredients and weights were used in the second base composition as listed in the third table. 2. Mix the granules from step 1 with a tray mixer (Diosana 229-057 type V50, number of mixing steps 1, mixing time 60 s / step, mixing speed 144 revolutions / min).

3. Extrude the granules from step 2 with a

Twin-screw extruder with co-rotating screw pair (Krupp Werner & Pfleiderer type ZSK 25, motor output around 20 kW, torque> 150 Nm, 1 1 housing elements, screw speed

450 revolutions / min, perforated plate with 4 holes as extrusion tool, throughput 30 kg / h, water bath length 300 cm).

4. metering the filler or fillers after plasticizing the

Granulate approaches during this step in a production zone of

Twin-screw extruder, wherein the filler or fillers before

To be dosed using a precision balance. 5. Injection molding of the extruded granules from steps 3 and 4 with an injection molding machine (Arburg Allrounder 270S 500-150)

Generation of test specimens with standardized test geometries for

Determination of the properties of the invention

Compound made of plastic.

The first table contains reference examples R1 to R5 with this first base composition, to which fillers known from the prior art have been added which increase the electrical conductivity of the PC + ABS. It is a block copolymerized

Polyamide / polyether block amide (Irgastat® P 22, BASF SE), hereinafter also referred to as fatty acid ester, a spherical natural graphite (Mechano-Cap 1 P1, H.C. Carbon GmbH) hereinafter also referred to as graphite and a Leitruß based on polystyrene

(LIFOCOLOR BLACK 3031 PS (Leitruß batch with 30 mass% polystyrene, Fa. LIFOCOLOR FARBEN GmbH & Co. KG) hereinafter also referred to as Leitrußbatch (30%).

The constituents of the reference examples to be added to the first base composition are indicated by their weight in [g], the proportion of the fillers is based on the total mass of the base composition (101 10 g) and mass of the additive and in [%] of these

Total mass indicated. The determined properties are also indicated.

Table 1: Reference examples with first base composition

R1 R2 R3 R4 R5

filler

Fatty acid ester 4333 - - - -

Graphite - 206.3 532.1 - -

Conductive blackbatch (30%) - - - 721, 4 2021

Proportion of filler 30.0 2.0 5.0 2.0 5.0

properties Surface resistance 1 E10 1 E12 1 E13 7E13 2E14

Electrical volume resistance 2E10 1 E13 1 E13 1 E12 5E1 1

decay

Thermal conductivity 0.2 0.2 0.3 0.2 0.2

Specific heat capacity 1, 6 1, 4 1, 3 0.9 1, 4

Shielding efficency electr. field

Shielding efficency magn. field

MVR 260/5 120 14.93 13.9 17.4 23.5

Density 1, 14 2,1 1, 16 1, 35 1, 14

Train modulus 1710 2480 2630 2370 2550

Notched toughness 30.7 19.7 13.1 63.4 13

Scratch resistance n.b. n.d. n.d. n.d. n.d. Antimicrobial Activity E. coli None n.b. n.d. n.d. n.d. antimicrobial activity S. aureus None n.b. n.d. n.d. n.d.

Appearance white gray dark gray black black

The remaining values of the respective decay behavior are supplemented.

The properties of the plastics listed in this and the following tables were determined in each case as follows:

- Surface resistance and electrical volume resistance

in accordance with DIN IEC 60093 VDE 0303/30 in ohms, whereby the measured values are determined by humidity, ambient temperature and by the

Contact pressure of the ohmmeter with the ring electrode on the sample plate influenced, whereby the humidity could not be regulated.

- decay behavior according to PV 3977 in s,

- thermal conductivity according to DIN EN ISO 22007-2 in W / (mK),

- specific heat capacity according to DIN EN ISO 1 1357-4 in J / (gK), - melt flowability (MVR 260 ° C / 5 kg) 1 133 min according to DIN EN ISO in cm ^3/10,

- the density according to DIN EN ISO 1 183 in g / cm ³ , - mechanical characteristics such as modulus of elasticity and tensile strength according to DIN EN ISO 527-1: Tensile modulus in N / mm ² ,

Notched impact strength according to DIN EN ISO 179 1 eA in kJ / m ² ,

- Scratch resistance according to DIN EN ISO 1518-1 qualitative, - antimicrobial activity according to ISO 22196 with Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) inm% and

- Color impression based on an optical assessment by a laboratory technician

Two further reference examples were prepared in which

Modification of the first basic composition in this no

White pigment, however, contained a metal fiber. These two

Reference Examples R6 to R8 are shown in Table 1 a below, wherein R6 and R7 each contained no white pigment: TABLE 1

R6 R7 R8

filler

Fatty acid ester - -

Graphite - -

Conductive blackbatch (30%) - -

Metal fiber 526.8 1766

Proportion of filler 3.75 11.25 0

properties

Surface resistance 1 E14 1 E14 1 E12

Spec. Surface resistance 1 E14 1 E14 1 E12

Surface resistance (gem.) 2.3E1 1 1.2E11 8.3E11

Electric volume resistance 1 E14 1 E14 1 E12

Cooldown -2.46 -0.83 -2.64

Thermal conductivity 0.2 0.3 0.2

Specific heat capacity 1, 4 1, 3 1, 2

1, 86- 4,22-

Shielding efficency electr. Field 1, 79 3.69

2.46- 2.47-

Shielding efficency magn. Field 4.34 0.76

MVR 260/5 14.9 9.29 18.81 Density 1, 16 1, 24 1, 13

Train modulus 2350 2780 2370

Notched toughness 19.8 12.1 51, 6

scratch resistance

antimicrobial activity E. coli

antimicrobial activity S. aureus

Appearance gray gray

The property values for the experiments carried out in this and the following tables are supplemented upon receipt.

The following Table 2 represents embodiments E1 to E6 of the invention with the first base composition. To this

The following compositions were added to at least one of the following fillers according to the invention: multiwalled carbon nanotubes (Plasticyl PC 1501, polycarbonate batch with 15 mass% Multiwall CNT NC7000 CAS No. 7782-42-5, Nanocyl SA), hereinafter MWCNT, and / or titanium heptaoxide (black titanium oxide, CAS No. 51745-87-0, KELA PIGMENT BLACK 35, from Chemikos Industrievertretungen), hereinafter black titanium oxide, and / or silver-coated

Copper particles (inter alia, eCONDUCT COPPER 421000, platelet-shaped D50 = 39.5 μm, 10% by mass of silver, from Eckart GmbH), hereinafter Ag-Cu-10. Table 2 Inventive examples with first base composition

Density 1, 15 1, 17 1, 175 1, 45 1, 18 1, 53

Pull modulus 2470 2850 2470 3070 2450 3750

Notched toughness 36.9 10.6 44.8 7.4 14.4 4.9

Scratch resistance n.b. n.d. Moderate Yes Moderate Yes Antimicrobial activity

n.d. n.d. n.d. n.d. -92.73 -99.92 E. coli

antimicrobial activity

n.d. n.d. n.d. n.d. -82.98 -99.94 S. aureus

Dunk Metallic Metallic

Appearance black black black

light gray light brown light brown

From the above tables it can be seen that the

Examples according to the invention all allow a high electrical conductivity of the plastic without the addition of graphite. It also shows that metallic filler examples increase scratch resistance and also exhibit antimicrobial activity. Accordingly, the addition of a filler according to the invention even leads to the improvement of three properties of the plastic produced from the compound. The dyeability is also increased wherever a light brown color sets. The example E5 represents an invention

particularly preferred embodiment, since it makes do with a very small and therefore inexpensive filler and yet shows all the advantages of the invention.

The following third table gives compounds of the invention with further fillers according to the invention, wherein a second

Base composition was used. This consists of

the previously described matrix material polycarbonate / acrylonitrile-butadiene-styrene (unfilled Bayblend T65 XF (about 65% by mass polycarbonate, 35% by mass acrylonitrile-butadiene styrene), eXtreme Flow Type, Covestro AG), hereinafter referred to as PC + ABS

(Weight 10,000 g) and the already described - Antioxidant as described above, hereinafter referred to again as antioxidant (weight 10 g).

The further fillers according to the invention which are added to this second base composition are indicated by their weight in [g], the proportion of the fillers being based on the total weight of the second

Base composition (10010 g) and stated in [%] of this weight. The properties determined in the same way as above are also indicated.

Such further fillers according to the invention were used: Coated metal fibers (Beki-Shield fibers, 75% by mass)

Steel fiber content, 25% by mass size, 5 mm cut length, 1 1 μηπ fiber diameter, Fa. Nanoverbundwerkstoffschicht Bekaert SA), hereinafter: metal fiber,

silver-coated aluminum particles (eCONDUCT ALUMINUM 201500, aluminum grit, D50 = 18 μm, 13.5% by weight of silver, Fa.

Eckart GmbH), hereinafter: Ag-AI-13.5,

silver-coated aluminum particles (eCONDUCT ALUMINUM 203000, aluminum powder, D50 = 23 μm, 29.0% by weight of silver, from Eckart GmbH), in the following: Ag-AI-29, silver-coated copper particles (eCONDUCT COPPER 421000, platelet-shaped, D50 = 39 , 5 μηπ, 10.0% by mass of silver, from Eckart GmbH), in the following: Ag-Cu-10,

silver-coated copper particles (eCONDUCT COPPER 122000, platelet-shaped, D50 = 10.5 μm, 20.0% by mass silver, from Eckart GmbH), in the following: Ag-Cu-20, silver-coated glass particles (eCONDUCT GLASS VP70308, precursor, approx. D50 = 35 μm, 20 to 25% by mass silver, from Eckart GmbH), in the following: Ag glass 20/25. The end of this page contains Table 3 which shows examples of the basic composition according to the invention.

TABLE 3 Inventive examples with second base composition

Also in this table, the compounds according to the invention are prepared when the application is filed, the experiments for determining their properties are not yet completely completed, the values are supplemented. The fillers of metal-coated metals and metal-coated metal oxides or semimetals, in particular glass, are known as

Color pigments from the paint industry also known for protective coatings.

Finally, the fourth table is on the next page

Compounds according to the invention with combinations of

Fillers according to the invention, which to the second

Base composition were added as described.

The properties of the plastics additionally listed in this table were determined in each case as follows:

- Shielding Efficiency according to ISO 7637 or IEC 1000-4 in dB. Table 4: Combinations of fillers according to the invention

Füllst.-fill. E17 E18 E19 E20 E21 E22 E23 E24 E25 E26 E27 E28 E29

883+

Ag-glass-20/25 + Ag-Cu-10

883

883+

Ag-Al-13.5 + Ag-Cu-10

883

612+ 811 +

Ag AI 13.5 MWCNT

1634 5410

612+ 811 +

Ag-Cu-20 + MWCNT

1634 5410

811 +

Ag-Cu-10 + MWCNT

5410

612.2+ 811.4+ 1306+ 1766 2094 2905

Metal fiber + MWCNT

1634 5410 1740 +5887 +1862 +6457

Share of filler 15,0 15,0 7,0 10,0 10,0 7,0 10,0 5,75 8,75 9,5 12,5 13,25 16,25

properties

Surface resistance 1E13 6E12 1E12 1667 47000 2E11 2E11 1.4E8 6000 7.5E6 1580 81000 160

Spec. Surface Resistor 1E13 4E12 1E12 1.5E7 4E6E6 3E11 4E10 1E9 12000 1.1 E7 950 45000 712

Oberflächewiderstnd. gem. 2.7E11 5.7E11 2.3E9 4000 23000 3.3E10 13000 2.0E10 13000 3,7E6 3700 500000 4300

Decay behavior -2.23 -2.55 -0.15 -0.18 -0.23 -0.62 -0.16 -0.29 -0.17 -0.36 -0.19 -0.20 0 , 07

Thermal conductivity 0.3 0.3 0.3 0.4 0.4 0.4 0.4 0.3 0.4 0.3 0.4 0.4 0.4

Specific heat capacity. 1.3 1.3 1.3 1.2 1.2 1.4 1.3 0.8 0.9 0.8 1.4 1.1 0.8

16.92 44.6 41.6 28.0 43.5 41.6 44.6 26.7 48.2

Shielding-Efficiency electr.

4.95 17.6 18.0 9.32 21.0 14.3 24.0 14.5 26.0

2,51- 2,46- 2,45- 2,34-2,22- 2,43- 2,31- 2,39- 2,44-

Shielding-Efficiency magnt.

1.29 2.37 1.96 1.38 3.81 1.62 4.52 1.29 5.53

MVR 260/5 23.55 22.83 21.37 0.51 0.59 7.84 0.44 6.16 0.40 3.98 0.23 3.38 0.30

Density 1.27 1.27 1.19 1.22 1.22 1.18 1.19 1.18 1.21 1.22 1.24 1.25 1.28

Pull modulus 3440 2850 2800 3070 3080 2610 2970 2870 3190 2810 3390 3020 3490

Notched toughness 6.6 7.4 12.1 5.5 6.0 11.9 7.0 16.0 9.5 11.5 7.2 9.2 5.2

scratch resistance

Antimik. Activity E. coli

Antimik. Activity of S. aureus

Metallic, Metallic Deep Low Low Low Low Low Low Low

Appearance gray gold Cu black black black black black black black black black black black light gray

Particularly in the case of the filler combinations with MWCNT, a particularly high surface resistance and thus improved conductivity are evident, and at the same time these are partly dyeable and have a metallic luster. They are also antimicrobial effective and have a good scratch resistance.

The results of further experiments with compounds according to the invention are shown in the following Table 5, in which the filler content was between 10 and 20 mass percent. Here, too, shows a particularly high

Surface resistance and thus improved conductivity with simultaneous colorability and metallic gloss.

Claims

PATENT CLAIMS Compound comprising at least one matrix selected from the group formed by polymer blends, copolymers, homopolymers, elastomers and thermoset polymers and at least one filler embedded in the matrix fabric after processing the compound, said copolymer matrix being selected from styrene-based copolymers SBC, SMMA; MABS, MBS, AMSAN, SAN, ABS and ASA and / or the homopolymer matrix material is selected from the styrene-based homopolymers GPPS, HIPS d ad u rc hge ngezeichnet that the filler has a core and a first, the core at least partially enveloping first Has a filler, wherein a proportion of the filler in the compound is at least one suitable for Perkolationsbildung part and wherein the proportion of the filler in the unprocessed state of the

Compounds between 1 mass% and 20 mass%, wherein the core of the filler is selected from the group formed by metals, ceramics, carbon nanotube structure and wherein the first shell material is selected from the group formed by metals, ceramics, carbon and in which the filler is an electrical conductivity as a first property and additionally influencing at least one second property of a plastic produced from the compound.

Compound according to claim 1, characterized in that the second property is chosen from the properties:

Thermal conductivity, heat capacity, modulus and thus

related impact strength, density, scratch resistance, antibacterial activity, color and melt volume flow rate.

Compound according to claim 1 or 2, d ad u rc h

in that the polymer blend matrix material is selected from the styrene-based copolymers + PA mentioned in claim 1 or from the styrene-based copolymers + polyester mentioned in claim 1, wherein the polyester is preferably a polycarbonate and the polymer blend is very particularly preferably a PC + ABS ,

Compound according to one of the preceding claims, characterized in that the core of the filler is selected from the group formed by copper or aluminum, silica or titanium oxide.

Compound according to one of the preceding claims, characterized in that the first shell material is selected from the group formed by silver, a metal oxide, carbon nanotube structure.

Compound according to one of the preceding claims, characterized in that the core and the first shell material are of the same chemical nature, in particular in each case carbon nanotubes.

Compound according to one of the preceding claims, characterized in that the filler at least one, the first Envelope has at least partially enveloping second envelope, which is preferably carbon nanotube form.

8. Compound according to one of the preceding claims, characterized in that the first envelope and the second envelope are formed differently in their chemical nature.

9. Compound according to one of the preceding claims, characterized in that the filler is fibrous, plate-shaped, spherical or gritty.

10. Compound according to one of the preceding claims, characterized

characterized in that the matrix material itself is filled, in particular with glass fibers, carbon fibers, steel fibers, minerals.

11. Use of the compound according to any one of claims 1 to 10 for the production of parts by Urformung of plastic

Condition, in particular Pressform-, injection molding, transfer molding, extrusion, Ziehform-, calendering and blow molding.