POLYMER-BASED SUBSTRATE AND METHOD FOR PRODUCING THE SAME

Abstract

A polymer-based substrate is proposed, which in particular is electrostatically coatable, wherein the substrate comprises a substrate base body made using a polymeric material and a coating applied to a surface region of the substrate base body, wherein the polymeric material comprises a first polymer, wherein the coating comprises a matrix polymer and an additive which is dispersed in the matrix polymer and reduces the surface resistance of the coating, said additive having a proportion that is selected such that the specific surface resistance of the coating is about 10.sup.10 Ohm or less, and wherein the matrix polymer is selected such that it is compatible with the first polymer.

Claims

1. A polymer-based substrate, comprising a substrate base body made using a polymeric material and a coating applied to a surface region of the substrate base body, wherein the polymeric material comprises a first polymer, wherein the coating comprises a matrix polymer and an additive which is dispersed in the matrix polymer and reduces the surface resistance of the coating, said additive having a proportion that is selected such that the specific surface resistance of the coating is about 10.sup.10 Ohm or less, and wherein the matrix polymer is selected such that it is compatible with the first polymer.

2. The substrate in accordance with claim 1, wherein the specific surface resistance of the layer with a reduced specific surface resistance is about 10.sup.9 Ohm or less.

3. The substrate in accordance with claim 1, wherein the matrix polymer is selected such that it is molecularly or microscopically mixable with the first polymer.

4. The substrate in accordance with claim 1, wherein the first polymer and the matrix polymer are soluble or swellable in the same solvent.

5. The substrate in accordance with claim 1, wherein the first polymer and the matrix polymer are selected from the polymer groups polyamide, polyester, polyether, polyketone, polyvinyl, poly-olefin and copolymers and functionalized polymers thereof.

6. The substrate in accordance with claim 1, wherein the first polymer and/or the matrix polymer is/are selected from the polymer group of polyamides.

7. The substrate in accordance with claim 1, wherein the first polymer in the polymeric material is present as a blend with a second polymer.

8. The substrate in accordance with claim 1, wherein the polymeric material comprises reinforcing substances.

9. The substrate in accordance with claim 1, wherein the additive for reducing the surface resistance of the coating is selected from the carbon-based components conductive soot, carbon nanotubes (CNT), carbon fibers, carbon layered materials, electrically conductive organic compounds, conductive polymers, electrically conductive ceramic, metal powders and metal fibers.

10. The substrate in accordance with claim 1, wherein the coating has an average thickness of about 100 m or less.

11. The substrate in accordance with claim 1, wherein the coating is configured as a continuous or large-area coating.

12. The substrate in accordance with claim 1, wherein the coating is selectively applied to one or a plurality of predetermined surface region(s) of the substrate body which is/are provided for a subsequent electrostatic coating, or which extends/extend substantially in parallel to a surface region of the substrate which is provided for an electrostatic coating.

13. The substrate in accordance with claim 1, wherein the substrate is configured as a heat-insulating profile, for the production of window, door, roof, or facade elements.

14. The substrate in accordance with claim 1, wherein the substrate is designed as a moulded part for an application outdoors.

15. The substrate in accordance with claim 1, wherein the matrix polymer has a temperature stability of about 200 C. or more.

16. The substrate in accordance with claim 1, wherein the coating is UV-stable.

17. The substrate in accordance with claim 1, wherein the substrate has a powder lacquer layer.

18. The substrate in accordance with claim 17, wherein the lacquer layer on the coating in the lacquered region has a lacquer coverage rate of about 90% or more.

19. A method for producing an electrostatically lacquerable, polymer-based substrate, wherein the method comprises: providing a substrate base body made using a polymeric material, wherein the polymeric material comprises a first polymer, providing a coating composition, comprising a solvent, a matrix polymer dissolved in the solvent, and an additive reducing the electrical resistance, wherein the solvent is selected such that the first polymer is soluble or swellable in the solvent, wherein the matrix polymer is compatible with the first polymer, and wherein the additive is dispersed in the coating composition, applying the coating composition to a surface region of the sub-strate base body while forming a surface layer, and removing the solvent from the surface layer.

20. The method in accordance with claim 19, wherein the solvent is selected such that the first polymer has a solubility of about 10% by weight or more.

21. The method in accordance with claim 19, wherein the solvent is selected such that the first polymer is swellable in the solvent.

22. The method in accordance with claim 19, wherein the solvent is selected from volatile solvents and has a boiling point or decomposition point of about 210 C. or less.

23. The method in accordance with claim 19, wherein the first polymer is selected from polyamide, polyester, polyether, polyketone, polyolefin, polyvinyl, and copolymers and functionalized polymers thereof; wherein the matrix polymer is selected from polyamide, polyester, polyether, polyketone, polyolefin, and polyvinyl; wherein the solvent comprises an organic liquid, selected from an aromatic hydrocarbon and/or carboxylated hydrocarbons, or a mineral acid and mixtures thereof and/or aqueous solutions thereof; and wherein the electrical resistance-reducing additive is substantially uniformly distributed in the matrix polymer.

24. The method in accordance with claim 19, wherein a surface region of the substrate is electrostatically powder lacquered with a lacquer powder after the application of the coating, wherein the powder lacquer is baked at a temperature of about 170 C. or more.

25. The method in accordance with claim 24, wherein the lacquer layer on the coating in the lacquered region has a lacquer coverage rate of about 90% or more.

26. The substrate in accordance with claim 4, wherein the solvent is a pure substance or a mixture of a plurality of pure substances, wherein the pure substance or the pure substances are selected from the organic liquids, aromatic hydrocarbons, esters, ethers, ketones, carboxylated hydrocarbons or inorganic acids.

27. The substrate in accordance with claim 6, wherein a) the first polymer is a polyamide 66, a polyamide 6, or a partially aromatic polyamide, and/or b) the matrix polymer is a polyamide 6, a polyamide 66, a polyamide 610, or a polyamide 410.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0137] In the drawings:

[0138] FIGS. 1A to 1D show a schematic depiction of the production of a substrate in accordance with the invention with a surface coating;

[0139] FIGS. 2A to 2D show two embodiments of a substrate in accordance with the invention before and after a powder lacquering;

[0140] FIGS. 3A to 3F show a plurality of embodiments of substrates in accordance with the invention;

[0141] FIGS. 4A to 4D show further embodiments of substrates in accordance with the invention;

[0142] FIGS. 5A and 5B show the test result of a powder lacquered substrate in accordance with the invention by means of cross-cut lines in different magnifications;

[0143] FIGS. 6A and 6B show a powder lacquered substrate with insufficient lacquer coverage;

[0144] FIGS. 7A and 7B show a substrate powder lacquered in accordance with the invention with full lacquer coverage; and

[0145] FIG. 8 shows lacquer coverage in direct comparison of a substrate coated in accordance with the invention and an uncoated substrate.

DETAILED DESCRIPTION OF THE DRAWINGS

[0146] FIGS. 1A to 1D shows a substrate base body 10 in the form of a so-called offset insulating profile in cross section perpendicular to the longitudinal direction thereof.

[0147] The cross section has on both sides of a planar middle section 12 offset regions 14, 16, the free rims of which are configured as so-called roll-in projections 18, 20. The roll-in projections can be guided into corresponding recesses of metal profiles and be connected to the metal profile in a shear-resistant manner by means of a so-called roll-in process.

[0148] The substrate base body 10 is typically made of a polymeric material, for example based on polyamide as the first polymer.

[0149] FIG. 1B shows schematically the process of applying a coating in accordance with the present invention for producing a surface with a specific surface resistance of 10.sup.10 Ohm or less.

[0150] The process of applying the coating is implemented here with spray technique, symbolized by a spray 24 which is applied in the direction of the arrow a to the surface of the insulating profile 10 located on top (viewing side 28) in FIGS. 1A to 1D.

[0151] The surface layer may be applied, for example, as a dispersion of conductive soot in a solution of polyamide 6 (PA6) in methane acid.

[0152] It can be seen in FIG. 1C that a surface layer 26 extending over the middle section 12 and into the offset regions 14, 16 has formed on the substrate body (insulating profile) 10, which surface layer 26 is subjected to a drying in the step symbolized in FIG. 1C, in which solvent components of the sprayed-on coating mass (see arrows b) are removed.

[0153] In FIG. 1D, the finished substrate 30 in accordance with the invention is then formed, in which the substrate base body 10 is provided with a coating 32 that has a specific surface resistance of about 10.sup.10 Ohm or less.

[0154] This substrate shape shown in FIGS. 1A to 1D provides an example of a simple profile geometry without hollow chambers, undercuts or the like, though it is explicitly noted that the model of FIGS. 1A to 1D is useable on many further, among other things highly complex profiles or moulded parts with three-dimensional structures.

[0155] In FIGS. 2A to 2D, two polymer-based substrates in accordance with the invention are depicted in FIGS. 2A and 2C, which subsequently are electrostatically coated with a powder lacquer layer (shown in FIGS. 2B and 2D). Here, too, the cross section is seen in each case perpendicularly to the longitudinal direction of the composite profiles.

[0156] In FIG. 2A, a portion of a metal-plastic profile 40 is shown which is formed from a polymer-based substrate 42 and respective metal profiles 44, 46 attached to the rims thereof. The polymer-based substrate 42 is again configured as an insulating profile with roll-in projections 48, 50 moulded offset on both sides, which are inserted into respective complementarily formed roll-in grooves 52, 54 of the metal profiles 44, 46.

[0157] The substrate 42 (insulating profile) in accordance with the invention has on its upper surface which is accessible here from the outside, in accordance with the invention, a coating 56 which extends, analogously to FIG. 1D, over the surface region of the insulating profile 42 located on top in FIG. 2A, namely up to the roll-in projections 48 and 50 of the insulating profile 42.

[0158] When rolling the roll-in profiles 48, 50 into the roll-in grooves 52, 54 of the metal parts 44, 46, a conductive contact with the coating 56 is produced, such that an electrostatic powder coating of a particularly high quality can be applied here.

[0159] The situation after the powder lacquering of the dry substrates is depicted in FIG. 2B, in which a powder lacquer layer 60 extends from the face side of the metal profile 44 over the surface of the coating 56 of the insulating profile 42 up to the face side of the second metal profile 46.

[0160] The electrostatically applied lacquer layer 60 is in particular very uniform and free of bubbles and has a high lacquer coverage rate.

[0161] FIG. 2C shows the section of a composite profile 70 with a polymer-based insulating profile 72 that is gripped on both sides by metal profiles 74, 76 by means of a roll-in connection. Roll-in projections 78, 80 of the insulating profile (substrate) 72 are hereby inserted into corresponding roll-in grooves 82, 84 of the metal profiles 74 and 76, respectively.

[0162] In contrast to the depiction of FIG. 2A, in this embodiment a coating 86, applied to the substrate base body 73 in accordance with the invention, with a reduced specific surface resistance is placed not on the viewing side but rather on the rear side. The coating 86 in turn is in electrically conductive contact with the metal profiles 74, 76 by the coating 86 extending up to the roll-in projections and thus coming into contact with the metal profiles 74 and 76, respectively, in the roll-in grooves 82, 84.

[0163] A powder lacquer layer 90 is again applied here on the viewing side. Said layer extends again from the face side of the first metal profile 74 over to the insulating profile 72 to the face side of the second metal profile 76. By means of the coating 86 with a reduced specific surface resistance of 10.sup.10 Ohm or less, applied in accordance with the invention to the substrate base body, the prerequisite is again met so that a continuous, flawless lacquer layer 90, which abuts directly against the substrate base body 73 in the region between the metal profiles 74, 76, can be applied to the viewing side of the composite profile 72.

[0164] FIGS. 3A to 3F shows with its examples in sub-figures 3A to 3F different substrates in accordance with the invention (each in a cross section perpendicular to the longitudinal direction) which have different configurations of coatings applied in accordance with the invention on the respective substrate base body 100, which has the shape of an offset insulating profile.

[0165] The substrate base body 100 has, in addition to a middle planar section 102, laterally adjoining offset regions 104, 106, which are then each adjoined by so-called roll-in projections 108 and 110, respectively.

[0166] The substrate base body 100 of FIG. 3A is provided with a coating 112 which wraps completely around in the circumferential direction and which extends not only on both sides of the middle section 102, but also around the offset regions 104, 106 and the roll-in projections 108 and 110.

[0167] In FIG. 3B again the substrate base body 100 is shown, in which the coating 114 to be applied in accordance with the invention extends only on one side of the middle section 102 and into the adjoining offset regions 104, 106 (in each case also only on one side). Thus in FIG. 3B there is a coating on the substrate base body 100, similar to what was described in connection with FIG. 1D.

[0168] In FIG. 3C, a coating 116 is applied to the base body 100 in the middle section 102 on one side, said coating 116 extending on both sides of the planar middle section 102 partially into the offset regions 104, 106 (also only on one side). The further surface regions of the offset sections 104, 106 and the roll-in projections 108, 110 remain coating-free.

[0169] In a further variant, shown in FIG. 3D is the selective application of a coating, wherein the coating has been divided here into four parallel strips or webs 118a, 118b, 118c, 118d, which all extend on the upper surface of the middle section 102 of the substrate base body 100.

[0170] Another variant of the selective coating of the substrate base body 100 is shown in FIG. 3E, a coating 120 applied in accordance with the invention extending here approximately over half of the one surface of the middle section 102 and over the offset region 106 (on one side).

[0171] In the sixth example of FIGS. 3A to 3F, a substrate in accordance with the invention is shown in FIG. 3F, in which the substrate base body 100 is provided with a coating 122 that extends both on a surface of the middle section 102, over the entire offset regions 104, 106 (on one side), and into the regions of the roll-in projections 108, 110.

[0172] In each of the embodiments of FIGS. 3A, 3B, 3E, and 3F, it is possible to bring the coating 112, 114, 120 and 122, respectively, applied in accordance with the invention into contact with the metal profiles when rolling in the roll-in projections 108, 110, such that they may act in a dissipative manner during the electrostatic powder coating.

[0173] In the other embodiments of FIGS. 3C and 3D, there is no such dissipative contacting of the metal profiles, such that a capacitive effect comes into play here. Moreover, in FIG. 3D there may be an electrically conductive connection of the separate webs (not shown).

[0174] In FIGS. 4A to 4D, further embodiments are shown, which is meant to illustrate by way of example the possibility of selectively applying a coating in accordance with the invention to a substrate base body.

[0175] In FIG. 4A, a base body 150 is shown with a planar middle section 152, laterally adjoining offset regions 154, 156, and roll-in projections 158, 160 moulded thereon. On the top surface of the middle section 152, a coating in accordance with the invention is selectively applied in the form of the letters ABC and the numbers 123, a circle, a dot, and the symbol , which are together referred to with the reference numeral 162.

[0176] The lettering ABC 123 .circle-solid. serves only as an example of any labeling that could be applied in this way to the surface of the middle section 152, optionally also on other surface regions of a substrate base body 150, by means of the coating in accordance with the invention. Typically, e.g., suitable printer systems, stamps, or stencils are used for this purpose.

[0177] In FIG. 4B, a coating with a plurality of strips 164a, 164b, 164c, 164d is applied to the base body 150, wherein the strip-shaped coatings 164a, 164b, 164c, 164d extend on the side located on top in the figure from the roll-in projection 158 over the offset region 154, the planar middle region 152 into the offset region 156 and the roll-in projection 160.

[0178] Here, too, there is the possibility of electrical dissipation via metal profiles (not shown) in the rolled-in state of the substrate base body 150 in an electrostatic powder lacquering.

[0179] In FIGS. 4A to 4D the coating is again limited to the top region of the middle section 152 of the substrate base body 150, wherein arbitrarily arranged round to oval, island-shaped surface regions, are shown here with the reference numeral 166, which may stand for any other small-scale patterns. Within the island-shaped surface regions, the coating works by means of a capacitive mechanism.

[0180] Finally, in FIG. 4D, the coating is again applied in a web- or strip-shaped manner, wherein a first strip patterns 168a extends on the surface of the middle section 152 in the longitudinal direction of the substrate base body 150, while a further element 168b extends perpendicularly to the longitudinal strips of the pattern 168a from the roll in projection 158 over the offset region 154, the middle section 152, the offset region 156 to the roll in projection 160.

[0181] Because the coating region 168b extends transversely over all strip-shaped sections of the pattern 168a, a dissipating function can again be ensured when the base body 150 is present with metal profiles in the roll-in composite.

[0182] In FIGS. 5A to 5B a light-microscopic image of a profile equipped in accordance with the invention is shown, which was subsequently powder lacquered according to Example 6 described in the following.

[0183] The cross-cut test was performed on this sample. FIGS. 5A and 5B show the result at different magnifications (FIG. 5A: 30, FIG. 5B: 100). There is a cross-cut value of 0, i.e., clear cuts without the light powder lacquer chipping off of the dark surface of the substrate base body; the lacquer adhesion is thus considered to be perfect.

[0184] Shown in the illustrations of FIGS. 6A to 6B are light-microscopic images of the lacquering result after powder lacquering a profile in accordance with Example 3 described in the following (FIG. 6A). The image was taken at 50 magnification. FIG. 6B shows a black and white variant of FIG. 6A, which was obtained by means of a digital image conversion and serves as the basis for a determination of the lacquer coverage rate. A lacquer coverage rate of about 56% can be determined on the basis of FIG. 6B.

[0185] FIGS. 7A to 7B shows a light-microscopic image of the lacquering result after the powder lacquering of a profile in accordance with Example 6 (FIG. 7A). The image was taken at 50 magnification. FIG. 7B shows a black and white variant of the depiction in FIG. 7A, which was obtained by means of a digital image conversion and serves as the basis for a determination of the lacquer coverage rate. A lacquer coverage rate of about 100% is determined for FIG. 7B. The lacquer coverage is thus perfect.

[0186] FIG. 8 shows a photographic image of a plastic-aluminum composite profile 200 with a first and a second metal profile 202, 204, which are connected to each other by way of a substrate 206 that is configured as an insulating profile, directly after the application of a white lacquer powder (electrostatic powdering), but before the lacquer baking process.

[0187] In the left region 208 of the substrate 206, before the powder application the substrate base body was equipped in accordance with the invention with a coating according to Example 7 described in the following, as is shown roughly in the case of the insulating profile of FIG. 3C. In the right region 210 of the substrate 206, the substrate base body was not equipped with a coating in accordance with the invention and thus corresponds to the subsequently described reference sample from Example 7.

[0188] The powder application to the present composite sample took place in one operation on the dried composite profile. There are very considerable differences in the lacquer coverage rate, which in the region 208 is nearly 100% and in the region 210 lacquer deposition is hardly visible to the naked eye.

EXAMPLES

[0189] In the following examples the specific surface resistance was determined on substrate base bodies (reference examples 1 to 3) and on substrates in accordance with the invention (examples 4 to 6) after storage in a standard climate and after an additional drying.

[0190] In each case extruded insulating profiles were used as substrate base bodies, the measurement of the specific surface resistance was performed on the so-called viewing side 28 of the section 12 of the substrate base body 10 and on the surface of the coating 32, respectively.

Example 1 (Reference)

[0191] In this example a solid, extruded insulating profile 10 with a planar middle section similar to the one in FIG. 1A is used, wherein the insulating profile is made of a polymeric material (polymer blend of PA66 and PPE with similar weight proportions) and with a content of glass fibers (GF) of 10% by weight. PA66 is used here as a first polymer and forms the continuous phase in the blend with PPE, while PPE is discontinuously dispersed in microscopically fine droplets.

[0192] A planar test piece is then milled from the profile, which is suitable for the measurement of the specific surface resistance.

[0193] The measured values for the specific surface resistance, measured under various conditions, are displayed in Table 1.

Example 2 (Reference)

[0194] In this example, again a solid, extruded insulating profile 10 with a planar middle section 10 similar to the one depicted in FIG. 1A is used, wherein the insulating profile is made of the polymeric material TECATHERM LO from the company Ensinger GmbH. This is a polymer blend of PA66 and PPE (with similar weight proportions) with a content of glass fibers (GF) of 20% by weight. PA66 is used here as a first polymer and forms the continuous phase in the blend with PPE, while PPE is discontinuously dispersed in m-sized droplets.

[0195] A planar test piece is then milled from the profile, which is suitable for measuring the specific surface resistance.

[0196] The measured values for the specific surface resistance, measured under various conditions, are displayed in Table 1. Due to the higher proportion of glass fibers, it results in a slightly higher specific surface resistance in comparison to the measured values of Example 1.

Example 3 (Reference)

[0197] In this example, again a solid, extruded insulating profile 10 with a planar middle section similar to the one depicted in FIG. 1A is used, wherein the insulating profile insulbar REG is made of the polymeric material TECATHERM 66 GF from the company Ensinger GmbH. In this case, PA66 is the first polymer and is reinforced by a content of glass fibers (GF) of 25% by weight. A planar test piece is then milled from the profile, which is suitable for the measurement of the specific surface resistance.

[0198] The measured values for the specific surface resistance, measured under various conditions, are displayed in Table 1. Due to the different composition (no PPE fraction) of the polymeric material, in particular the thereby higher proportion of (moisture-absorbing) PA66, there is a further reduced specific surface resistance in comparison to the measured values in Examples 1 and 2.

[0199] The lacquer coverage rate of the dried and powder lacquered profile is only about 56% and is thus obviously insufficient. The lacquering tests were performed with a white powder lacquer of the type SA816G Interpon D1036 (manufacturer: Akzo Nobel Powder Coatings GmbH). For this purpose, the powder lacquer was applied to the pre-dried substrate using a commercially available powder gun for electrostatic powder coating and was baked in an oven at 200 C. for 20 minutes.

Example 4

[0200] In this example again an insulating profile 10, as described in (reference) Example 1, is used as a substrate base body.

[0201] In contrast to Example 1, the insulating profile 10 has now been provided, in accordance with the invention, with a coating 32, as can be seen in FIG. 1D.

[0202] A coating composition containing conductive soot was produced as the coating mass for producing the coating 32. For this purpose, a commercially available conductive soot concentrate of the type Hubron NBB310 (manufacturer: Hubron International, Great Britain) in concentrated methane acid (concentration >98%, Carl Roth GmbH+Co. KG) with a solids content of 50 g/l was introduced, dispersed, and applied to the surface of the substrate base body by means of spray coating. The conductive soot concentrate Hubron NBB310 is, according to the manufacturer's information, conductive soot in a matrix polymer of PA6 with small amounts of an unspecified ethylene terpolymer as a modifier.

[0203] The PA6 mass with conductive soot was dissolved under heavy stirring upon introduction into the methane acid and was subsequently further dispersed using a rotor-stator mixer (Ultra-Turrax of the company IKA) to finely distribute the conductive soot in the PA6 methane acid solution. This coating composition is used in a timely manner in order to avoid degradation or sedimentation.

[0204] Alternatively, of course other dispersion techniques can be used like, for example, grinding in ball mills, wet mills, colloid mills, or by means of high-pressure homogenizers, rolling mills and ultrasonic homogenizers. This process can finally be supplemented by pressing through fine nozzles, decanting, filtering, or otherwise fractioning one or more times in order to remove poorly dispersed coarse fractions of the conductive soot.

[0205] The spraying of the coating composition onto the substrate base body is carried out by means of a pressurized air-operated lacquer spray gun with a flat jet nozzle (nozzle diameter 1.5 mm), wherein the substrate base body is continuously moved through the fine mist, such that a thin but deep black and opaque application is obtained without large amounts of the liquid coating composition accumulating.

[0206] The drying is carried out by airing the substrates at room temperature with good ventilation, this being completed in a time of about 0.5 to 1 minute and the substrates then being hand-dry and matte black.

[0207] The average layer thickness of the coating 32 was about 1 m to about 5 m.

[0208] The measured values for the specific surface resistance of the coating 32, measured under different conditions, are displayed in Table 1. In comparison to the measured values of Examples 1 to 3, there is a significantly reduced specific surface resistance due to the proportion of additive (conductive soot). The effect of the drying process on the measured specific surface resistance is lower (as a percentage) here than in the reference examples 1 to 3.

Example 5

[0209] In this example again an insulating profile 10, described as described in Example 2, is used as a substrate base body.

[0210] In contrast to Example 2, the insulating profile 10 has now been provided, in accordance with the invention, with a coating 32, as can be seen in FIG. 1D.

[0211] The coating 32 way produced from a composition in accordance with Example 4.

[0212] The spraying of the coating composition onto the substrate and the drying takes place analogously to Example 4.

[0213] The average layer thickness of the coating 32 was about 1 m to about 5 m.

[0214] The measured values for the specific surface resistance of the coating 32, measured under different conditions, are displayed in Table 1. In comparison to the measured values of Examples 1 to 3, there is a significantly reduced specific surface resistance due to the proportion of additive (conductive soot). The effect of the drying process on the measured specific surface resistance is lower (as a percentage) here, too, than in the reference Examples 1 to 3.

Example 6

[0215] In this example again an insulating profile 10, described as described in Example 3, is used as a substrate base body.

[0216] In contrast to Example 3, the insulating profile 10 has now been provided, in accordance with the invention, with a coating 32, as can be seen in FIG. 1D.

[0217] The coating 32 was obtained from a coating composition in accordance with the description in Example 4.

[0218] The spraying of the coating composition onto the substrate and the drying again take place analogously to Example 4.

[0219] The average layer thickness of the coating 32 was about 1 m to about 5 m.

[0220] The measured values for the specific surface resistance of the coating 32, measured under different conditions, are displayed in Table 1. The effect of the drying process on the measured specific surface resistance is lower (as a percentage) here than in the reference Examples 1 to 3.

[0221] The lacquer coverage rate of the dried and powder lacquered profile is about 100% and is thus perfect. The lacquering tests were performed analogously to Example 3 and again with a white powder lacquer of the type SA816G Interpon D1036 (manufacturer: Akzo Nobel Powder Coatings GmbH). For this purpose, the powder lacquer was applied to the pre-dried substrate using a commercially available powder gun for electrostatic powder coating and was baked in an oven at 200 C. for 20 minutes.

[0222] Examples 1 to 6 hereby clearly show that the specific surface resistance can already be significantly reduced by applying a thin coating in according to the invention and thus can result in electrical conductivity of the surface. An adaptation of the surface resistance, if desired, is easily possible by adapting the formulation, for example by changing the proportion of the conductive additive.

Example 7

[0223] An insulating profile 30, produced in accordance with the invention, with the coating 32 was processed to a metal-plastic profile (analogously to FIG. 2A) and subsequently electrostatically lacquered with a white powder lacquer together with an untreated insulating profile (without a coating) as a reference example.

[0224] A bone-shaped in insulating profile of the type insulbar L018 from the company Ensinger GmbH, which was coated in accordance with the invention with a dispersion of Hubron NBB310 in methane acid (solids content 50 g/L), serves here as a base.

[0225] The production of the coating composition and the implementation of the spraying of the coating composition correspond to the description in Example 4. The average layer thickness of the coating 32 was about 1 m to 5 m.

[0226] To be able to compare the positive effects on the substrate in accordance with the invention directly with the untreated substrate base body, for test purposes rectangular regions of the substrate base bodies were covered and as a result were not provided with the coating in segments. One thus obtains test samples in the form of substrates (insulating profiles) which have a direct sequence of regions or segments that take well and take poorly to being coated (see FIG. 8).

[0227] The lacquering tests were performed with a white powder lacquer of the type SA816G Interpon D1036 (manufacturer: Akzo Nobel Powder Coatings GmbH). The powder lacquer was applied to the pre-dried substrates (<0.1% by weight residual moisture) using a commercially available powder gun for electrostatic powder coating and was baked in an oven at 200 C. for 20 minutes.

[0228] While no continuously covering lacquer layer could be formed on the reference example, i.e., the profile segment 210 without a coating in accordance with the invention (lacquer coverage not visible to the naked eye, thus completely inadequate), the powder lacquering of the substrate 206 in accordance with the invention in the region 208 resulted in a visually appealing, continuous, uniform white lacquer layer with very good lacquer adhesion to the coating 32 in accordance with the invention.

[0229] The lacquer adhesion to the substrate in the region 208 was tested using a cross-cut test (DIN EN ISO 2409), the result of which is shown in FIGS. 5A and 5B. The determined cross-cut value in this case was 0, which is the best possible result. The lacquering result using a substrate in accordance with the invention is thus judged to be excellent.

Example 8

[0230] In order to evaluate the possible change in the mechanical properties of the substrates 30 due to contact with a good solvent for the first polymerin this case methane acidmechanical test were performed on uncoated substrate base bodies 10 of the type insulbar REG in accordance with Example 3 and on substrates coated in accordance with the invention according to Example 6each without a powder lacquering having been performed.

[0231] Mechanical tests were hereby performed in the form of tensile tests, each with a set of n=10 test pieces; these were milled from the insulating profiles used. For evaluating the parameters E-modulus, transversal and longitudinal tensile strength (in relation to the longitudinal direction of the profiles) and the elongation at break, in each case the arithmetic mean was established.

[0232] For Example 8a, an untreated substrate base body 10 of the type insulbar REG as described in Example 7 is used as a reference. Example 8b corresponds to the substrate coated in accordance with the invention (insulating profile 30 with the coating 32) in Example 6. The results are summarized in Table 2 and show that the application of a coating 32 does not significantly influence the observed mechanical parameters of the substrate base body.

TABLE-US-00001 TABLE 1 realized layer thicknesses of the coatings in Examples 4 to 6 are on average about 1 m to about 5 m. Specific surface re- Specific sistance surface (storage resistance in a after Conduc- Material standard drying Ex- First Matrix tive substrate climate) (160 C./ ample polymer polymer additive base body Coating [] 6 h) [] 1 PA66 without without blend of PA66 with uncoatedreference 5.69E+13 6.63E+14 PPE and 10% GF 2 PA66 without without blend of PA66 with uncoatedreference 1.49E+14 7.20E+14 PPE and 20% GF 3 PA66 without Without PA66 25% GF uncoatedreference 4.50E+13 2.73E+14 4 PA66 PA6 conductive blend of PA66 with spray coating with disper- 7.79E+05 1.13E+06 soot PPE and 10% GF sion of conductive soot- PA6 compound in formic acid (solids content 50 g/L) 5 PA66 PA6 conductive blend of PA66 with spray coating with disper- 5.12E+05 7.73E+05 soot PPE and 20% GF sion of conductive soot- PA6 compound in formic acid (solids content 50 g/L) 6 PA66 PA6 conductive PA66 25% GF spray coating with disper- 1.7E+05 2.02E+05 soot sion of conductive soot- PA6 compound in formic acid (solids content 50 g/L)

TABLE-US-00002 TABLE 2 change in selected mechanical properties of substrate base bodies after the application of a coating in accordance with the invention Elon- gation Tensile Tensile Residual Substrate E- at strength, strength, moisture Ex- base modulus break longitudinal transversal [% by ample body Coating [relative] [relative] [relative] [relative] weight 8a-ref. insulbar REG without 100.0% 100.0% 100.0% 100.0% 0.3 8b insulbar REG with 100.5% 102.4% 100.1% 99.3% 0.3