Thermoplastic polyurethane from recycled raw materials

A process for producing a component, the process comprising:

• obtaining a thermoplastic polyurethane by a process comprising:
• (a) reacting a thermoplastic polyurethane (TPU-1) or a polyurethane mixture comprising TPU-1 with a compound (V1) having two hydroxyl groups to obtain a mixture (G-a) comprising a thermoplastic polyurethane (TPU-2), wherein an average molecular weight of TPU-2 is less than an average molecular weight of TPU-1;
• and
• (b) reacting G-a with a mixture (G-b) comprising an isocyanate composition (ZI) comprising a diisocyanate and optionally a polyol composition (ZP) comprising a polyol (P2) to obtain a thermoplastic polyurethane (TPU-target),
• wherein a proportion of ZI and ZP is matched to a hard segment content of TPU-1, V1 and a hard segment content of TPU-target, and
• a proportion of ZI, ZP and V1 is matched to the hard segment content of TPU-1 via formula (1):
• HSCG-c=(HSCTPU-target−wTPU-1*HSCTPU-1)/(1−wTPU-1) (1),
• where
• HSCG-c=a hard segment content of a mixture (G-c), wherein G-c=G-b+V1,
• HSCTPU-target=a hard segment content of the obtained TPU-target,
• wTPU-1=a mass fraction of TPU-1, based on a total mass of TPU-1 and G-c, and
• HSCTPU-1=the hard segment content of TPU-1;
• and
• processing said thermoplastic polyurethane thereby obtaining said component;
• wherein said component is an extruded, injection molded or pressed article, a foam, a cable sheathing, a hose, a profile, a drive belt, a fiber, a nonwoven, a film, a molding, a sole, a sporting good, a shoe, a plug, a housing, or a damping element.