Abstract: An adhesion promoter composition foregoes the use of toxic heavy metals and also features a relatively large add-on window for an adhesion functioning in the assembly. The adhesion promoter composition is an aqueous solution comprising (a) ¼-3 parts by weight of a polymer selected from the maleic acid/polyacrylic acid copolymer, modified polyacrylic acid, or polyacrylic acid groups; (b) 1 part by weight of a phosphate component; and optionally (c) 1/10 to 5/10 parts by weight of a metal-containing component selected from the Zn, Ca, Mg and/or Al group.

Abstract: The invention relates to a method for producing composite webs or composite sheets, consisting of at least a first lower cover layer (1) of metal, a second upper cover layer (2) of metal, and a core layer (3) of plastic, which is arranged between the cover layers (1, 2) and is integrally bonded thereto, wherein a first metal strip (4) for the lower cover layer (1), a second metal strip (5) for the upper cover layer (2), and a plastic web (6) for the core layer (3) are brought together and are integrally bonded to each other by the application of pressure and/or heat.