NOVELTY - Thermoplastic composition comprises a mixture of at least two polymers. The first polymer comprising a grafted polyamide polymer having polyolefin backbone containing a residue of at least one unsaturated monomer (X) and many polyamide grafts attached to polyolefin backbone by residue of (X) comprising a function capable of reacting in a condensation reaction with a polyamide. The second polymer comprises a copolymer of ethylene and non reactive or non functional monomer. The polyamide grafts of first polymer have glass transition temperature and melting temperature of less than or equal to 160 degrees C.    USE - The thermoplastic composition is useful: in a thermoplastic film; and in encapsulating layer of photovoltaic module (all claimed).    ADVANTAGE - The thermoplastic composition: exhibits excellent creep resistance at 100 degrees C or more, good optical properties, good durability properties under moisture, heat and UV, good electrical properties, low moisture uptake and excellent barrier properties; retains mechanical and thermomechanical properties; and exhibits improved degradation over time (electrical resitivity drop).    DETAILED DESCRIPTION - Thermoplastic composition comprises a mixture of at least two polymers. The first polymer is present at 10-70 wt.% of the composition and comprises a grafted polyamide polymer having polyolefin backbone containing a residue of at least one unsaturated monomer (X) and many polyamide grafts, where the polyamide grafts are attached to the polyolefin backbone by residue of (X) comprising a function capable of reacting in a condensation reaction with a polyamide having at least one amino-terminal and/or at least one terminal carboxylic acid, the residue of (X) is fixed to the backbone by grafting or copolymerization and the polyamide grafts are present at 10-60 wt.%, preferably 15-55 wt.% of the grafted polyamide polymer. The second polymer is present at 10-90 wt.% of the composition and comprises a copolymer of ethylene and non reactive or non functional monomer, with flexural elastic modulus of 250 MPa at 230 degrees C and crystalline melting point of 60-120 degrees C. The polyamide grafts of first polymer have glass transition temperature and melting temperature of less than or equal to 160 degrees C. The polyamide grafts in first polymer are present at 3-15 wt.%, preferably 5-12.5 wt.% of the thermoplastic composition. An INDEPENDENT CLAIM is also included for a thermoplastic film of photovoltaic module comprising at least two layers one of which forms the encapsulant layer and/or protective back layer, where the encapsulating layer comprises the thermoplastic composition.