Process for producing a metal-plastic hybrid component

1. A process for producing a hybrid component comprising metal and plastic, the process comprising:

pretreating a metal surface by applying at least one conversion layer;

applying at least one layer of an adhesion promoter composition; and

bonding the metal to the plastic,

wherein the adhesion promoter composition comprises at least one copolyamide-based hotmelt adhesive and does not comprise a functionalized polyolefin, and

the hybrid component has a bond strength in a range of from 6.2 to 16.0 MPa.

2. The process of claim 1 , wherein the copolyamide-based hotmelt adhesive comprises a copolyamide, at least one epoxy component, and at least one blocked polyisocyanate.

3. The process of claim 1 , wherein the plastic has been reinforced.

4. The process of claim 3 , wherein the plastic has been reinforced by fibers.

5. The process of claim 1 , wherein a converting agent is used to produce the conversion layer.

6. The process of claim 5 , wherein the converting agent comprises halides.

7. The process of claim 6 , wherein the converting agent comprises fluorides.

8. The process of claim 5 , wherein the converting agent comprises halide salts, complex halides or mixtures thereof.

9. The process of claim 1 , wherein in the bonding, the plastic is applied to the coated metal by injection moulding, pressing, laminating, in-mould coating or (co)extrusion.

10. The process of claim 1 , wherein the conversion layer is obtained by a process comprising treating the metal surface with a plasma jet produced by using an operating gas and/or a flame jet produced by using a combustion gas, wherein at least one precursor material is introduced into the operating gas and/or the plasma jet or into the combustion gas and/or the flame jet such that the precursor material is reacted in the plasma jet or flame jet to form a reaction product and that the reaction product is deposited on the metal surface and/or on at least one layer disposed on the metal surface to coat the metal surface and/or the at least one layer.

11. The process of claim 1 , wherein the metal comprises an iron-containing alloy.

12. The process of claim 1 , wherein the metal comprises steel.

13. The process of claim 1 , wherein the plastic comprises at least one selected from the group consisting of a polybutylene terephthalate, a polyolefin, a polycarbonate, a polyurethane, an aliphatic or semiaromatic polyamide, acrylonitrile-butadiene-styrene, and polymethylmethacrylate.

14. The process of claim 1 , wherein the at least one copolyamide-based hotmelt adhesive in the adhesion promoter composition comprises a copolyamide, an epoxy component, and a blocked polyisocyanate.