DE1659038C3 - - Google Patents

Description

The invention relates to a multilayer component with a carrier layer at least 2 mm thick made of thermoplastic material and at least one with this over an adhesion-promoting layer connected thin layer of metal.

Components of this type are known in many variations. Their metal layers exist, for example made of aluminum or alloyed steels, their plastic layers, for example, made of vinyl chloride polymers, Polyester resins, ethylene-vinyl acetate copolymers, polyamides, acrylic ester polymers or Styrene polymers.

Such components have a number of advantages over conventional components, but are relatively sensitive to weather conditions, corrosion or loosening of the individual Effect layers of each other. For some purposes, they often also have an inadequate Flexural rigidity.

From British patent specification 991 568 it is known Ethylene copolymers containing acrylic acid and an acrylic acid ester in polymerized form as hot melt adhesives or as a modifier for waxes. Ethylene terpolymers are preferred into consideration, the ester component of which is derived from a primary alcohol. As it turned out has, however, the weather resistance of these ethylene terpolymers still leaves something to be desired.

There are also Verbundfoiien known, with a layer of polyethylene and one with this over a Adhesion-promoting layer connected thin layer of metal. The adhesion promoting agents used there Layers are not enough to create components with high rigidity, weather resistance and strength to manufacture.

The object of the invention is to provide a multilayer component of the type described at the outset, the layers of which are more firmly connected to one another, so that the component can also be exposed to higher loads and has a correspondingly high rigidity. The multilayer component should have a good surface quality ι,.; Ό 5 be weather-resistant. The association is also intended to preserve the application of greater external forces. According to the invention, the object is achieved in the component described at the outset. λ>:> the adhesion-promoting layer is an Athylencopolymeri .-. u ίο, the 60 to 90 parts by weight of ethylene, 0.5 to 3 parts by weight of acrylic acid and 0.5 to 20 parts by weight of tert-buty! esters of acrylic acid - where c ^: ": sum of the parts by weight is 100 in each case - : v, contains polymer-bound form and the support layer consists of low-density polyethylene.

The multilayer component can go be modified that on the thin metal layer another metal layer is located and imH the same liability agency for their connection ao material is used as for the connection <L_t first metal layer with the carrier layer.

Through the use of the special ethylene copolymer, which contains acrylic acid and tert-butyl acrylate in polymerized form, and low-density polyethylene components are obtained that have good rigidity and are weather-resistant, as well as good ones Have surface properties.

There is no protection here for the copolymer used to produce the components desired.

In the following description, the order of the layers is given with ordinal numbers for clarity marked.

The proposed component is z. D. composed of (1) a 0.01 to 0.5 mm thick first, outer layer made of a corrosion-resistant metal, (2) a 0.02 to 0.5 mm thick second, inner layer made of the ethylene copolymer, (3) a 0.3 to 4 mm thick third, inner layer made of a dimensionally stable metal, (4) ciner / S & 1 to 1 mm thick fourth, inner layer made of the ethylene copolymer. (5) a 2 to 20 mm thick fifth, inner layer made of low-density polyethylene, (6) a 0.02 to 1 mm thick sixth, inner layer made of the ethylene copolymer, (7) a 0.1 to 4 mm thick seventh, outer or - if there are eighth and ninth layers - inner layers made of a dimensionally stable metal, and - if necessary - (8) a 0.02 to 0.5 mm thick eighth inner layer made of the ethylene copolymer and (9) a 0, 01 to 0.5 mm thick, ninth, outer layer made of a corrosion-resistant metal.

The layers (1) and - if given - (9) can for example consist of copper, aluminum or brass foils or foils made from stainless steels.

The ethylene copolymer of layers (2), (4), (6) and - if given - (8) expediently has the following characteristics: density 0.9 to 1.1 g / cm ³ , crystalline content below 60%, Shore hardness C 30 to 90. In the case of the elements, the composition of the ethylene copolymers of the individual layers can be identical to or different from one another. They are advantageously used in the form of foils. Since they act like a hot melt adhesive, they must be in a plastic to viscous state during processing - that is, during the manufacture of the elements. The associated temperatures - and thus the working

] 659

temperatures - are 80 to 250 C, especially 130 to 220C.

The layers (3) and (7) can consist of aluminum or sheet steel, for example.

The components can be produced by conventional methods. An appropriate procedure exists z. B. in that one in a plate press a metal foil - intended for layer (1) - einiegt, on it a Foil made from the ethylene copolymer - intended for layer (2) -, then a metal sheet - intended for Layer (3), on it a film made of the ethylene copolymer - intended for layer (4) - and on it the for layer (5) certain plastic, after which pressed at elevated temperature and pressure will. First a five-layer shark stuff is used obtained from layers (1), (2), (3), (4) and (5). On this - expediently still hot - semi-finished product can e.g. B. a film made of the ethylene copolymer - intended for layer (6) - can be placed and then either the sheet metal intended for layer (7) or a semi-finished product from the layers (9), (8) and (7), it being possible for this semifinished product to be produced in a manner analogous to that of the first-mentioned semifinished product and should also be hot. The whole thing can then be placed in a press frame be pressed at elevated temperature to form an intimate bond.

The components are suitable, for example, for prefabricated house construction, ship and wagon construction as well as Partition walls in building construction.

The ethylene copolymer used in the following example contains 88.3 parts by weight of ethylene, 3.5 Parts by weight of acrylic acid and 8.2 parts by weight of the tert-butyl ester of acrylic acid are copolymerized.

Example·

In a platen press, (1) a 0.1 mm thick alloy sheet is placed one after the other Steel, (2) a 0.2 mm thick film of the ethylene copolymer, (3) a 2.2 mm thick sheet of iron, (4)

is an Äfram thick film of the ethylene copolymer and (5) a 5 mm thick plate made of polyethylene (density 0.918 g / cm ³ ), whereupon the whole thing at 190 ⁰ C for 5 minutes at a pressure of 0.2 kp / cm ² to one intimate bond is pressed. A three mm thick sheet of iron [intended for layer (7)] is placed on the semi-finished product obtained in this way - still in the same heat - and covered on its underside with a 0.15 mm thick film made of the ethylene copolymer [intended for layer (6)]. is coated, whereupon again at 190 ⁰ C over

3 minutes at a pressure of 0.24 kp / cm ^{2 is} pressed to the finished component, which is removed from the press ^{at 60 0 C.}

Claims (2)

Patent claims: 1. Multi-layer component with a thermoplastic carrier layer at least 2 mm thick Plastic and at least one connected to this via an adhesion-promoting layer thin layer of metal, thereby characterized that the hafi-mediating Layer is an ethylene copolymer containing 60 to 90 parts by weight of ethylene, 0.5 to 20 parts by weight Acrylic acid and 0.5 to 20 parts by weight of the tert-butyl ester of acrylic acid - with the Surrnpe of Parts by weight is 100 in each case - contains in polymer-bound form and aie carrier layer is made of low density polyethylene. 2. Multi-layer component according to claim 1, characterized in that on the thin Metal layer there is another metal layer and that the same adhesion-promoting layer is used for their connection Material is used as for the connection of the first metal layer with the Carrier layer.