Patent ID: 8318835
Filing Date: 2012-11-27
Classification: B29B,B29C,B29K,Y02W

Abstract:
1. A process for manufacturing a composite material suitable to be used for the manufacture of automotive covering parts, the process comprising the steps of: (i) choosing and mixing a first natural fiber and a second natural fiber or lignocellulosic residue different from the said first natural fiber, wherein the total weight of natural fibers or lignocellulosic residue, when present, in relation to the total weight of the composite material is comprised between 10 and 60%; (ii) making the length of the natural fibers and lignocellulosic residue when present uniform; (iii) treating the surface of the natural fibers and of the lignocellulosic residues, when present, with a treatment agent; (iv) drying the natural fibers and the lignocellulosic residue, when present, wherein the humidity does not exceed about 1,000 ppm of water; (v) adding about 30 to 90% in weight of a recycled thermoplastic polymer and about 1 to 70% in weight of a virgin thermoplastic polymer, in relation to the total weight of the composite; (vi) premixing the natural fibers, the lignocellulosic residue when present and the polymer; (vii) extruding and granulating the composite material; and (viii) injection molding the composite material for the conformation of parts wherein in step (v) it is also added a polypropylene copolymer with medium ethylene content in about 0.01% to about 20% in weight in relation to the total weight of the composite.