Patent ID: 8691127

Claim:
A process for the production of a composite component via multicomponent injection molding, where the composite component comprises a main body composed of a thermoplastic A) and an external layer composed of a foamed thermoplastic B), said process comprising providing the main body in a first process step a) via injection molding of the thermoplastic A) and subsequent hardening of the thermoplastic A) in an injection mold, and injecting an external layer on to the main body in a second process step b) which follows directly, via injection molding of a mixture comprising the thermoplastic B) and a chemical blowing agent at an injection molding temperature in the range from 180° C. to 200° C., and subsequently hardening the mixture in the same injection mold, with an extended cavity, and foaming the external layer on to the main body in a further process step d) via introduction of heat at a foaming temperature in the range from 180° C. to 200° C., and solidifying the composite component via cooling in a final process step e), wherein the thermoplastic B) comprises at least one polyamide whose modulus of elasticity derived from the tensile test (tensile modulus) E t is from 1 MPa to 250 MPa, as determined by DIN EN ISO 527 of April 1996, in the entire temperature range from 70° C. to 180° C., and wherein the chemical blowing agent comprises one or more substances present in non-polymerized form, and wherein the thermoplastic B) is a polyamide copolymer which comprises, as monomer units, caprolactam, hexamethylenediamine, adipic acid, and bis(4-aminocyclohexyl)methane.