DE19517338A1 - Composite plastics product for electronic screening and mfg. process - Google Patents

Abstract

A composite plastic product (10) comprises a first part (12) of a coatable plastic and a second part (18) of a non-coatable plastic which is formed around the first part (12) and leaves exposed areas of the latter (12) which are coated in a metallic layer (30).A component specifically for EMI and RFI screening is claimed in which the exposed area of the first part (12) is covered with an electrically conductive metallic layer (30). A component is claimed in which the first part (12) has an opening (32) from a first face through to a second face and a second part (18) covers the first part leaving one face exposed. A section of the second part extends through the opening (32) and projects beyond the exposed face to form a support (22). The metallic layer (30) covers the exposed face around the support (22). Decorative composite products with selectively coated areas are claimed in which the first part is a non-coatable material and the second part a coatable material partially embedded in the first part. The uncovered areas of the second part are coated in a metallic layer. A process for selective coating of the composite product is claimed in which the product is subjected to a coating soln. which adheres only to the exposed areas of the second part comprising a coatable polymer.

Description

The present invention relates generally to molding processes for the production of composite products consisting of two or several plastic materials are molded. In the narrower This invention is concerned with a method by which is a plastic molded product so manufactured can that certain areas of the product without use can be coated by covering materials, e.g. B. for Formation of a metal layer on the product to the to allow electromagnetic shielding of the product lichen.

From the prior art it is known that electronic Ge advise generating a magnetic flux, which if not the function of other electronic components is restricted can adversely affect a phenomenon that generally mean electromagnetic interference (EMI) becomes. It follows that electronic devices such. B. Laptops, typically have an outer jacket, which from an electromagnetic shielding material, e.g. B. one  Layer consists of copper, nickel, zinc or aluminum, which be the electromagnetic flow generated inside limits, as well as interference from electronic devices prevented outside the casing. The above Solution is generally also for shielding radio frequency signals by radio equipment, e.g. B. amplifiers, detectors and others Instruments are generated, applicable. If they are not such signals cause a Radio Frequency Interference (RFI), which is undesirable in addition to the necessary signals from other radio frequency devices occurs.

A well-known process for the production of jackets with a complete shielding layer consists of the To form a casing from a galvanizable plastic, to electrolessly coat the inner surface of the casing and the outer surface of the casing with a smooth coat Mistake. A disadvantage of this method, however, is that such lacquered outsides the strong physical bean saying that such mobile electronic devices are out are not enduring. The paint is used more and more, resulting in a negative overall appearance of the Jacket and the device leads. Another method be it says, the sheath made from a weatherproof art to shape fabric material and a shield on the inside surface of the casing by applying a conductive paint to create a layer. Another method exists inside, a casing made of soft, impact-resistant plastic to shape, to mold a structured material and this structured material then with a conductive coat of paint Mistake. However, the latter two methods have the disadvantage that conductive paints a relatively poor Shielding effect show which in different applications with that of conventional shielding materials like copper and nickel is not comparable.  

Various other methods for solving the above. Problem are contained in Hart's U.S. Patent 5,164,542, which discloses the Use layers of woven polyethylene fiber that with a layer of magnetically shielding material are described, whereby everything in a molding process is bonded to a foam core material. Another ver driving is described in U.S. Patent 5,170,009 to Kadokura ben, with different layers on a non-metallic Base material to be bonded. The successive Layers include a copper-plated layer, which is called serves first shielding layer, a copper oxide layer and Outer layer made of conductive plastic, which is galvanically applied the copper oxide layer is applied. As can be seen are the requirements that both procedures make in order to subsequent layers for an electromagnetic Ab to form shielding, from the procedural point of view un Cheap.

Accordingly, there is a need for a method of manufacturing provision of a product which is selectively linked to a metallic layer, e.g. B. an EMI / RFI shielding layer for a casing that acts as a housing for an electronic front direction or an electronic device is suitable can be. In particular, there is a need for a method an electromagnetic shield on the inner surface the sheathing and at the same time a more durable and resisting more stable layer on the outer surface of the casing forms. Preferably such a shroud should only be one need a small number of process steps to manufacture the minimizing the cost of materials and materials for the sheathing ren, while also adding functional and aesthetic should offer advantages that the sheathing to the one set for mobile devices of the electronic industry as well various other branches of industry which arise from such a Process can benefit, makes it particularly suitable.  

According to the invention, a product and a method for Manufacture of such a product created with wel chem it is possible to use part of the product, however not the whole product, with a metallic coating to coat material. The product is therefore known draws that it consists of a plastic composite body, d. that is, the product is made up of at least two parts different polymers exist, is formed. A first one Part is made of a coatable plastic material and a second part is not coated from one ed plastic material in such a way over the first part shaped that a portion of the first part through the second Part remains open throughout. In the end it covers a metal layer essentially the entire open area of the first Part. The first part is preferably harder and stiffer than the second part, so the first part is the structural Stiffness of the product secures while the second part forms a permanent and impact-resistant outer protective layer. By molding the plastic composite product that it has the shape of a casing, the metal layer as an electrically conductive layer on the corresponding Inner surface of the casing to be arranged by the first part is formed, with an EMI / RFI shield on made of plastic molded composite product. Dude natively, the metal layer can serve decorative purposes where on a surface of the plastic molded Ver federal product is limited, e.g. B. to form a decorative part for an automobile body.

According to the manufacture of plastic molded composite product as a sheath for an elec tronic device additional advantages. For example, a or several openings are formed in the first part, so that in the process step of molding the first part in the second part is the material from which the second part is molded is protruding through the openings so that there are a number of shock-absorbing pedestals that forms over the metal layer  protrude on the first part. Such pedestals can before partially used as shock-absorbing spacers which a printed circuit board is stored and from the metal layer can be spaced.

In view of the above, professionals will recognize that the present invention a new method for selek tive coating of the molded plastic product contains. The process essentially comprises the steps for the production of the plastic molded product in the way that the first part is inserted into the second part is bet that a portion of the first part of the second Part remains uncovered. A particularly suitable method for Production of the molded plastic product is a two-stage molding process, in which first the first part is molded and then the first part with the second part is molded. According to the procedure, the second part is made a non-coatable polymer and the first part molded a layerable polymer so that the exposed Section of the first part of a coatable exposed Surface formed from the plastic molded product. The entire plastic molded product is then converted into one Given coating solution in which there is a metal layer in sections on the coatable surface, the formed by the exposed area on the first part is separating. Because the second part does not consist of one layered material, the metal layer forms not out on the second part, so that the second part would During the coating step as a mask for the first part serves. In this way, through the coating step on the surface of plastic molded products a coating with a predetermined surface shape forms.

From the foregoing it can be seen that an essential pre part of the present invention is that a Plastic molded product with a selective coating  tion can be produced on its surface. A sol che possibility is particularly in the manufacture of order sheaths for electronic devices desired, which a Must have EMI / RFI shielding. especially the EMI / RFI shielding can easily be done through a coating procedures are formed in which a suitable Metal on a coatable plastic, which the has structural structure of the casing, precipitates.

At the same time, the invention enables the coated Surface by a non-coatable plastic, which covers part of the coatable plastic, be is restricted, so that the size and shape of the coated Surface slightly by appropriate overmolding with the second Part can be formed.

In addition, there is an essential advantage of this invention in that the manufacture of a selectively coated Plastic composite product with additional advantages leads that are not known from the prior art. The fact that z. B. the first part from a stiffer, be layerable material and the second part from a ge more supple, non-coatable material, can be a selective arrangement of the more supple material advantageous bump on the surface of the product show damping properties.

Selectively coated plastic products can be invented also for a number of other purposes be put. For example, in addition to making an order Jacket for electronic devices, the present invention also for the production of permanent decorative products, e.g. B. of molded parts for automobile bodies, which advantageously has a selectively coated surface can use a composite part.

Accordingly, it is an object of the present invention a method of manufacturing a product develop with which a limited, predetermined Be rich in the product by introducing the appropriate Coat the product in a suitable coating solution and a selectively coated surface on the product can be formed.

It is another object of this invention that such Procedures for shaping which include size and Form of the product and the coated surface voices.

Yet another object of this invention is that such Products from a coatable plastic and a should not be coated plastic, the non-coatable plastic is the coatable plastic should at least partially overmold so that a coating surface is formed on the product.

Another object of the invention is that such Product can be easily molded and stiff and soft Areas as a result of selective shaping when stiff Plastic is molded into more supple plastic, forms.

Yet another object of this invention is that Process a molding step that allows the Er certificate for a number of applications places where the coated surface has a functio has a light and / or aesthetic purpose.

Another object of the invention is to provide a method for To develop a product in which a be limited, predetermined area of the product with a sprayed electrically conductive coating on the product becomes.  

Yet another object of the invention is a Process for the manufacture of a casing product to develop electronic devices, the product being a has first layer of plastic, and a second Layer of plastic over the first plastic layer is molded, and in which on the first plastic layer a metallic paint was sprayed, which is suitable is the EMI / RFI- emitted by the electronic device Shield signals.

Other objects and advantages of this invention are achieved by the following detailed description in connection with the Drawings clearly.

The drawings show:

Fig. 1 is a perspective view of an embodiment according to the Invention of a casing for an electronic device;

Fig. 2 is a plan view of the lower surface of the casing according to Fig. 1;

Fig. 3 is a partial sectional view as it results along section line 3-3 in Fig. 2;

Fig. 4 is a partial sectional view as it results along section line 4-4 in Fig. 2; and

Fig. 5 is a cross section through part of an automobile body according to another embodiment of the invention.

In Fig. 1 a part of the casing 10 is shown, which che one half of a casing of a (not Darge presented) electronic device, for. B. forms a laptop. A second, just such part, which is adapted so that it fits with the casing part 10 of FIG. 1, is required to obtain a complete casing for the electronic cal device. As shown, the casing part 10 comprises an inner surface 12 with an inner surface 12 a, which is formed by the central field 14 of the casing part 10 and by the inner surface 12 b of an edge 16 which is located on the circumference of the casing part 10 . The sheathing part 10 also includes an outer surface 18 , which che che by the lower outer surface 18 a of the central panel 14 and the outer surface 18 b of the edge 16 is formed. According to a preferred aspect of this invention, the inner surface 12 of the casing member 10 is made of relatively rigid plastic, while the outer surface 18 is made of a smoother, shockproof material, as will be described in more detail below. This structure is consistently described in the following explanation as a composite part, which means that two or more materials are combined to form a unitary body that has two distinct areas with different properties.

In Fig. 1 as well as in Fig. 2, a number of before jumps 20 , spacers 22 and foot portions 24 can be seen (the foot portions 24 are only hinted at in Fig. 1). With the projections 20 and (not shown) fastening parts, the sheathing part 10 can be connected to the matching other half and / or an electronic component or a printed circuit board (not shown). For this purpose, the projections 20 must be suitably stiff and firm so that the fastening part can be reliably connected to them. Therefore, the projections 20 are formed from the same rigid plastic from which the inner surface 12 of the sheathing part 10 is made. In contrast, the spacers 22 and the foot portions 24 must have a certain suppleness. The spacers 22 serve as shock absorbers, which help to protect an electronic component or a circuit board within the casing part 10 from shock and vibration. The foot parts 24 , which are shaped so that they protrude from the lower surface 18 a of the central field 14 , as shown in Fig. 2, the NEN, the lower surface 18 a of a surface on which the casing part 10th is set to distance. Dement speaking, the spacers 22 and the foot parts 24 are preferably formed from supple material, which forms the outer surface 18 of the casing part 10 .

Fig. 3 shows in a partial sectional view of the preferred construction of the sheath part 10. In particular, the sheathing part 10 is formed from an inner part 26 and an outer part 28 , the inner and outer parts 26 and 28 being nested, as shown. According to a preferred aspect of this invention, the inner part 26 is made of a rigid plastic and determines the structural shape of the casing part 10 , while the outer part 28 is made of a supple and shockproof plastic and forms the outer protective layer over the casing 10 . The rigid plastic for the inner part 26 is also chosen so that it can be coated by known autocatalytic and electrolytic technologies. In contrast, the supple plastic of the outer part 28 is specifically selected so that it is not coatable and preferably resistant to the etching and preparation of typical coating solutions. In addition, the supple plastic for the outer part is preferably resistant to environmental influences to which the sheathing part 10 is exposed in use, for. B. moisture, weak solvents and ultraviolet radiation.

Suitable rigid and flexible materials must also be selected for this invention according to the principle of mutual compatibility. For example, the shrinkage of the outer part 28 must be compatible with that of the inner part 26 during the course of the process in order to prevent warping of the sheathing part 10 . In addition, the rigid and the supple plastic must have expansion coefficients that are compatible with one another in order to prevent warping of the sheathing part 10 when it is exposed to extreme temperatures. Finally, the rigid and the supple plastic must also fit together in the respect that a suitable connection is established between them, which persists over the entire life of the sheathing part 10 .

On the basis of the aforementioned criteria, various plastics have been found which are essentially suitable for implementing this invention. For example, suitable supple, non-coatable plastics for the outer part 28 are such plastics as polypropylene, polyethylene, high-density polyethylene, polyphenylene sulfide, polyphenylene oxide, polyvinyl chloride, polystyrene and polyurethane. Suitable rigid, coatable plastics for the inner part 26 are polycarbonate, acrylonitrile butadiene styrene and modified PC / ABS materials. In practice, a particularly suitable material for the outer part 28 is a thermoplastic polyurethane with a hardness number 84 , which is available from the Dow Chemical Company under the name PELLETHANE, and a particularly suitable material for the inner part 26 is a PC / ABS plastic, which is available from General Electric Company under the designation C2950HF. The advantages of a material that has the properties of PELLETHANE include scratch resistance as well as shock and sound absorption, while also forming a non-slip outer surface for the casing 10 . The preferred PC / ABS plastic shows excellent coating properties as well as good mechanical properties and chemical resistance. While the above materials have proven to be suitable, it goes without saying that other materials can be used if they meet the above criteria.

In order to produce a composite structure of the casing part 10 according to the invention, a two-stage molding process is preferably used, in which the inner part 26 is first molded in a cavity formed from two mold halves. An upper half of the mold is then indexed to place a second upper mold half in position over the lower mold half, thereby making it possible to mold the outer part 28 over the inner part 26 . With this method, the outer part 28 overmoulds the inner part 26 and leaves an area of the inner part 26 open to form a layerable area on the casing part 10 . The two-stage molding process described above is known from the prior art and will therefore not be described in more detail below. However, the two-stage molding process according to the invention differs considerably from the prior art practice with regard to the achievable possibilities for a composite molded plastic, such as. B. the molded part 10 according to the invention. In particular, because the outer part 28 is made of a non-layerable plastic, the entire sheathing part 10 can be exposed to a coating solution in which a metal layer is only on the coatable area formed by the exposed portion of the inner part 26 , is deposited. Because the outer part 28 is made of non-coatable material, no metallic layer is deposited on the outer part 28 , so that the outer part 28 actually serves as a mask for the inner part during loading. Therefore, painting technologies with covers that were previously necessary for coating plastics are not required for the selective coating of the inner surface 12 of the casing 10 .

Thus, the molding method according to the invention directly determines the resulting coated area of the casing part 10 .

The result described above is shown in FIG. 3, in which the inner surface 12 of the casing part 10 , which is composed of the inner surfaces 12 a and 12 b of the middle field 14 and the edge 16 , is shown as it is with a metallic layer 30 is coated. As a sheathing part 10 for electronic devices or devices, the metallic layer 30 serves as an EMI / RFI shielding. Known coating metals such as copper or nickel, as are known from the prior art, are suitable as metallic layer 30 for this purpose. However, any known material that serves as EMI / RFI shielding can be used. Because the metallic layer 30 is applied to the laminatable plastic of the inner part 26 , a pretreatment of the inner part 26 is necessary in order to produce a reliable bond between the metallic layer 30 and the inner part 26 . As is known from plastic coating, the inner member 26 is preferably exposed to a caustic acid, which can be any of a number of known acids used in the pre-treatment of plastics for coating. As is known, the acid is preferably in a bath in which the sheathing part 10 is immersed. The duration of the acid treatment and the bath temperature can vary over a wide range, which depends on the concentration of the acid in the bath and on the plastics used for the inner and outer parts 26 and 28 . The acid concentration, the duration and the temperature are chosen so that the surface of the inner part 26 is effectively etched and roughened to make it suitable for the coating. However, it is important that the acid does not attack the outer surfaces 18 a and 18 b of the outer part 28 .

On the acid etching a known neutralization process follows in order to remove the acid from the surfaces of the casing part 10 . The deposition of the metallic coating 30 can then be completed by an autocatalytic coating method known from the prior art. Such methods are suitable for the deposition of copper and nickel as well as combinations of both, as are widely used as EMI / RFI shielding materials. It is important that the outer part 28 serves as a mask for the inner part 26 during the coating process, so that only the open surfaces of the inner part 26 are coated. Accordingly, the coated surfaces, ie the coated area of the covering part 10 , are determined by the molding process with which the inner and outer parts 26 and 28 are produced.

Those skilled in the art will recognize that a decorative or functional coating, e.g. B. a chrome coating, can be used as a metallic coating 30 before preferably. The deposition of such a metallic coating 30 generally requires the autocatalytic deposition of a suitable thin metal layer on the acid-etched inner portion 26 and thereafter the electrolytic deposition of chromium on the thin metal layer. A known catalyst, e.g. B. palladium is mostly used to accelerate the electrolytic separation of chromium from the surface of the inner part 26 by absorption on the roughened surfaces of the inner part. Again, the surfaces formed by the outer part 28 effectively serve as a mask for the inner part 26 , so that during electrodeposition, the chromium is only on the surfaces of the inner part 26 that are left free by the outer part 28 . settles. Suitable electrolytic processes, which are usually used for the deposition of a thin layer of chromium on the sheathing part 10 by conducting an electric current through an aqueous solution of a salt containing chromium ions, are known to those skilled in the art and are therefore not to be described in detail.

A further advantageous aspect of this invention is shown in FIG. 4, which shows a sectional view of one of the spacers 22 and the foot parts 24 from FIGS. 1 and 2. Fig. 4 shows in detail how these parts can be integrally molded. In order to provide the spacer 22 , an opening 32 is formed in the inner part 26 during the first phase of the two-stage Formvor described above, so that part of the flexible plastic material of the outer part 28 can flow through the opening 32 to the spacer 22 form during the second phase. As can be seen, the spacer 22 projects beyond the metallic coating 30 , and can therefore be used for spacing between the metallic coating 30 and a printed circuit board or an electronic construction element, which are supported by the spacer 22 . Thus, the spacer 22 is used not only for vibration isolation of the plate or the electronic component tes before impacts on the sheathing part 10 , but it also creates an electrical insulation of the plate or the component by preventing contact with the metallic coating 30th

The options shown in FIG. 4 can also be used to create various other features on the casing part 10 . So z. B. a molded hinge on the sheathing part 10 from the supple plastic as an attachment to the outer part 28 . In addition, pressure-sensitive switches can be molded into a cavity in the inner part 26 so that they are functional through the smooth outer part 28 . If the thickness of the outer part 18 is sufficiently small, fluorescent tubes can be integrally molded, which are visible through the outer part in the switched-on state, but are completely invisible in the switched-off state. It is clear to those skilled in the art that in addition to the examples shown, there are numerous other possible embodiments of the composite products shaped according to the invention.

Fig. 5 shows a composite product which can be manufactured according to another embodiment of the invention. Fig. 5 is a cross section through a body part 110 for an automobile, which has a base body 112 , a be layerable body 114 and an adhesive tape 116 for attaching the body part 110 to a body field of the car mobile. As shown, the coatable body 114 is formed as an integral but separate part of the body part 110 in the same manner as the inner part 26 as an integral but separate part from the outer part 28 of the casing part 10 according to FIGS. 1 to 4. According to In this embodiment, the base body 112 is molded from a flexible, non-coatable plastic material described above, while the coatable body 114 is molded from a rigid, coatable plastic described above. Like the casing part 10 , the body part 110 benefits from the composite structure, in which the arrangement of the coatable body 114 on and / or in the base body 112 forms a coatable area which can be coated by one of the above-mentioned coating processes. A hard chrome coating 118 is preferred for the body part 110 for aesthetic or functional reasons. The non-coatable material of the base body 112 in turn serves as a mask, which is used to keep limited sections in the area of the coatable body 114 free.

An additional advantage of the body part 110 , which was produced in accordance with the invention, is its property to be significantly more flexible than known chrome-plated plastic products from the prior art, which results from the fact that it consists predominantly of the flexible base body 112 . Alternatively, the coatable body per 114 need not be limited to the area of the base body 112 , but can to a large extent be embedded within the base body 112 if additional rigidity of the body part 110 is necessary. This possibility provides another important aspect of the structural shaping of the body part 110 . In particular, the coatable body 114 can be used to form one or more rigid areas on the body portion 110 that protect the chrome coating 118 from excessive bends that would likely destroy the chrome coating 118 . Therefore, the more flexible regions of the body part 110 are formed by the base body 112 , which differ from the more rigid regions which are formed by the body 114 .

From the foregoing it can be seen that this invention is a Molding process involves forming a composite Allows product whose coating capabilities un indirectly determined by the molding process. In consequently, an important aspect of this invention is the Use of at least two moldable plastics, from one stiff and coatable and the other supple and is not coatable. By appropriate modification of the Molding process and / or a change in the process flow selective coating ability is achieved. These selective coating ability is particularly by the selectively embedding a coatable material in reached a non-coatable material, so that non-coated material as a mask for the coating capable material in the subsequent coating process serves. Experts will recognize that the type of coating tion by the molding process according to the invention not be is restricted, and both a shield and a de corative coating applied to the molded product can be. In addition, decorative varnished Er testimonials from the invention benefit because the color does not adhere to most non-coatable plastics, and the method according to the invention thus enables the on application of protective coatings to products thereof have to stay free.  

Another advantage is that the different mechanical properties of the two or more moldable plastics make it possible to also selectively determine the deformability characteristics of a molded composite product. This is particularly evident in the spacer parts 22 shown in FIGS. 1 and 4, as well as in the body part 110 shown in FIG. 5. Such possibilities are also in numerous other applications, he wishes, for. B. for truck bumpers, as well as for decorating car bumpers, flexible grilles and hubcaps.

In addition to the inventive features mentioned above, which refer to the coatable plastics, it is still possible to use the soft plastic outside and and then shape the rigid plastic inside conduct one electrically onto the inner surface of the inner layer apply the coat of paint, which acts as an EMI / RFI protective layer works. Every average specialist knows that sprayed on dashes, e.g. B. copper and silver coatings, as EMI / RFI Shielding can be used, but not so are as effective as those described above technology, however, is the sprayed EMI / RFI shield effective enough for some areas of application not the effectiveness of the coated EMI / RFI shielding need.

The process of making a part that is a spray painting of electrically conductive material is in essentially the same as that described above, with the off assumed that a coating is not carried out. Instead of to produce them in the two-stage molding process is based on the Surface of the hard plastic layer of the product conductive layer sprayed on to shield the EMI / RFI produce. It may be necessary to use the soft outer layer of the Mask product to prevent electrical conductive spray paint sticks to it.  

The advantage of spraying a conductive coating on the rigid material of the two-stage shaped according to the invention Product is that the sprayed conductive Coating requires a less expensive process than applying an electrically conductive coating. The by spraying the layer onto the rigid layer of the The molded product in the two-stage process has the Disadvantage that the sprayed coating as a shield against EMI / RFI signals is not as effective as that in Be coating process applied electrically conductive Be layering. It is also possible to use the stiff and the Arrange soft layer so that the rigid plastic Outer layer and the soft plastic bil the inner layer det, and that the electrically conductive material on the outside layer is sprayed on to give an aesthetic appearance target, which also guarantees EMI / RFI shielding.

While the present invention is based primarily on an electronic casing and a body part for an automobile, it goes without saying that the teaching of the invention also on other malleable Er is applicable, which is a metallic coating for EMI / RFI shielding, to increase the resistance against wear or erosion or for decorative purposes need. Accordingly, the scope of protection of the Erfin only limited by the following claims.

Claims (35)

1. Plastic-molded composite product ( 10 ; 110 ), characterized by a first part ( 12 ; 112 ), which consists of a coatable polymer, a second part ( 14 ; 114 ) in over the first part ( 12 ; 112 ) is shaped such that a region of the first part remains uncovered by the second, the second part ( 14 ; 114 ) being made of a non-coatable polymer, and a metallic layer ( 30 ) covering essentially the entire region of the first part . 2. A composite product according to claim 1, characterized in that the metallic layer ( 30 ) is an electrically conductive layer which has an EMI / RFI shielding on the region of the first part ( 12 ; 112 ) of the composite product ( 10 ; 110 ). 3. A composite product according to claim 1, characterized in that the metallic layer ( 30 ) is a decorative metallic layer, which is limited by the second part ( 14 ; 114 ) of the plastic molded composite product. 4. A composite product according to claim 1, characterized net that the first part has at least one opening points through which at least a portion of the second part extends to a shock absorbing To form a base, which over the metallic layer protrudes. 5. A composite product according to claim 1, characterized net that the metallic layer is an autocatalytic applied layer.   6. A composite product according to claim 1, characterized net that the metallic layer is an electrolytic applied layer. 7. A composite product according to claim 1, characterized net that the metallic layer is sprayed on Layer is. 8. A composite product according to claim 1, characterized net that the first part is harder and stiffer than that second part is. 9. A composite product according to claim 1, characterized net that the coatable polymer is an impact resistant thermoplastic from the group of poly carbonates, acrylonitrile butadiene styrenes or PC / ABS materials is. 10. Plastic molded composite EMI / RFI shielding characterized by a first part, which consists of a be layered polymer is molded, a second part that is shaped over the first part in such a way that a Area of the first part uncovered by the second remains, the second part from a not be layerable polymer exists, as well as an electrical conductive metallic layer covering the area of the The first part covered an EMI / RFI shield for the plastic molded EMI / RFI shielding part form. 11. Compound EMI / RFI shielding according to claim 10, characterized characterized in that the first part at least one public tion, through which at least one Ab cut of the second part extends to a to form shock-absorbing base, which over the metallic layer protrudes.   12. Composite EMI / RFI shielding according to claim 10, characterized characterized in that the metallic layer is an auto is a catalytically applied layer. 13. Compound EMI / RFI shielding according to claim 10, characterized characterized in that the metallic layer is an elec is trolytically applied layer. 14. Compound EMI / RFI shielding according to claim 10, characterized characterized in that the metallic layer is a sprayed layer is. 15. Compound EMI / RFI shielding according to claim 10, characterized characterized in that the first part is harder and stiffer than the second part is. 16. Composite EMI shielding according to claim 9, characterized ge indicates that the coatable polymer is an impact solid thermoplastic from the group of Polycarbonates, acrylonitrile butadiene styrenes or PC / ABS materials is. 17. Composite product molded from plastic, marked net by a first part, which consists of a coatable Polymer, a second part with an opening, which from a first surface of the first part leads a second surface of the first part, a two part which is shaped over the first part in such a way that through an area of the first surface of the first part the second part remains uncovered and the second part consists of a non-coatable polymer, so that the first part is harder and stiffer than the second Part, a metallic layer that essentially the entire area of the first surface of the first parts be covers, and a section of the second part, the protrudes through the opening to a shock absorbing  To form a base, which over the metallic layer protrudes on the first surface of the first part. 18. A composite product according to claim 17, characterized net that the metallic layer lei an electrically layer is to put an EMI / RFI shield on the Form composite product. 19. A composite product according to claim 17, characterized net that the coatable polymer is an impact resistant thermoplastic from the group of poly carbonates, acrylonitrile butadiene styrenes or PC / ABS materials is. 20. A composite product according to claim 17, characterized net that the composite product is a casing for a forms electronic device. 21. A composite product according to claim 20, characterized net that a section of the second part is a distance piece for a circuit board that is in the electro African device is included. 22. Selectively coated composite product marked through a first part that consists of a non-coated ed polymer, a second part, which is partially is embedded in the first part in such a way that an area of the second part of the first part unbe remains covers, the second part from a be layerable polymer and the area of the two part of a selectable be layered composite product, as well as a metallic layer covering the area of the second part so covered that it has a coated section forms the selectively coated composite product.   23. A selectively coated composite product according to claim 22, characterized in that the metallic layer is an electrically conductive layer and an EMI / RFI Shielding on the selectively coated composite product forms. 24. A selectively coated composite product according to claim 22, characterized in that the metallic layer is a decorative metallic layer that is characterized by the first part of the selectively coated composite product it is limited. 25. A selectively coated composite product according to claim 22, characterized in that the second part mind least has an opening, and that a portion of the first part through this at least one opening extends so that he bil a shock-absorbing base det, which protrudes beyond the metallic layer. 26. A selectively coated composite product according to claim 22, characterized in that the metallic layer is an autocatalytically applied layer. 27. A selectively coated composite product according to claim 22, characterized in that the metallic layer is an electrolytically applied layer. 28. A selectively coated composite product according to claim 22, characterized in that the metallic layer is a sprayed-on layer. 29. A selectively coated composite product according to claim 22, characterized in that the second part harder and is stiffer than the first part. 30. A selectively coated composite product according to claim 22, characterized in that the coatable poly  always an impact-resistant thermoplastic the group of polycarbonates, acrylonitrile butadiene Styrene or the PC / ABS materials is. 31. A selectively coated composite product according to claim 22, characterized in that the coatable Surface of relatively stiff areas of the selectively coated ten composite product forms that the first part right relatively smooth areas of the selectively coated Composite product includes, and that the metallic Layer is limited to the coatable area, so that they have minimal influence on the bendability of the first part. 32. Method for the selective coating of a composite product molded from plastic, characterized in that it comprises the following method steps:
Forming the plastic product, consisting of a first part and a second part, which is embedded in the first part so that an area of the second part remains uncovered by the first part, and the first part from a non-coatable polymer and the second part are formed from a coatable polymer, the area of the second part forming a coatable surface of the plastic product, exposing the plastic product to a coating solution, and selectively applying a metallic coating to the coatable surface through the area of the second Part is formed without immediately forming a metallic layer on the first part and thus to form a coated surface on the product molded from plastic. 33. The method according to claim 32, characterized in that the step of depositing an electrolytic process.   34. The method according to claim 32, characterized in that the process of depositing an autocatalyti process. 35. The method according to claim 32, characterized in that the shaping is a two-step shaping process, at which the second part first and the first part about second part is molded.