Metal-polypropylene-metal laminate and method of making a shaped sheet article of such a laminate

摘要

A metal-polypropylene-metal laminate, in which the metal sheets are steel or aluminum is provided which is suitable for cold-forming followed by heat treatment at at least 135 DEG C., e.g. for use in vehicle bodywork. To achieve this, the polypropylene of the core of the laminate has a yield stress at the heat treatment temperature of not less than 2 MPa, and has shape stability such that in a standard shape stability test at the heat treatment temperature it changes shape by not more than 0.5 DEG . A bonding agent between the polypropylene core and the metal sheets is suitably one having a thermosetting component and a polypropylene thermoplastic component.