Binder for injection moulding composition

A binder for an injection molding composition, said binder consisting of, in percentage by weight and for a total of 100%:

• 35% to 60% of a component (a), or polymer base, consisting of a polymer or a mixture of polymers, each said polymer being non-amphiphilic and having a weight-average molar mass of greater than or equal to 5,000 g/mol,
• 30% to 55% of a component (b), or wax, consisting of a polymer or a mixture of polymers, each said polymer being non-amphiphilic and having a weight-average molar mass of less than or equal to 5,000 g/mol, and
• less than 10% of an amphiphilic component (c), or surfactant, and
• less than 10% of other components (d),
• the polymer base comprising 2% to 15% of a styrene-ethylene-butylene-styrene copolymer (SEBS), in percentage by weight based on the weight of the binder, the content by weight of styrene in the SEBS being greater than 15% in percentage by weight based on the weight of said SEBS, a weight-average molar mass of said SEBS being greater than 100,000 g/mol.