Binder mixture, comprising with respect to the sum of components i.-vi.: i. 5-45% by weight of at least one polyester comprising: a) a dicarboxylic component comprising, with respect to the total dicarboxylic component: a1) 0-80% in moles of units deriving from at least aromatic dicarboxylic acid, a2) 20-100% in moles of units deriving from at least one saturated aliphatic dicarboxylic acid, and a3) 0-5% in moles of units deriving from at least one unsaturated aliphatic dicarboxylic acid; and b) a diol component comprising, with respect to the total for the diol component: b1) 95-100% in moles of units deriving from at least one saturated aliphatic diol, and b2) 0-5 % in moles of units deriving from at least one unsaturated aliphatic diol; ii. 0-6% by weight of at least one dihydroxyl compound having the formula C n H 2n 2 in which "n" is from 2 to 14; iii. 10-55% by weight of at least one cross-linking and/or chain extender agent comprising at least one compound having two and/or multiple functional groups comprising isocyanate, peroxide, carbodiimide, oxazoline, epoxy, anhydride and divinylether groups and mixtures thereof wherein said agent iii. comprises at least 25% by weight of at least one compound having two and/or multiple functional groups including isocyanate groups; iv. 2-45% by weight of at least one compound containing silicon selected from (3- glycidyloxypropyl)trimethoxysilane, (3-isocyanatopropyl) triethoxysilane and organosilanes having at least one sulfur atom; v. 0-60% by weight of at least one thermoplastic polyolefin having a melting point ≤140°C; and vi. 0-40%) by weight of water. i. 5-45% by weight of at least one polyester comprising: a) a dicarboxylic component comprising, with respect to the total dicarboxylic component: a1) 0-80% in moles of units deriving from at least aromatic dicarboxylic acid, a2) 20-100% in moles of units deriving from at least one saturated aliphatic dicarboxylic acid, and a3) 0-5% in moles of units deriving from at least one unsaturated aliphatic dicarboxylic acid; and b) a diol component comprising, with respect to the total for the diol component: b1) 95-100% in moles of units deriving from at least one saturated aliphatic diol, and b2) 0-5 % in moles of units deriving from at least one unsaturated aliphatic diol; a) a dicarboxylic component comprising, with respect to the total dicarboxylic component: a1) 0-80% in moles of units deriving from at least aromatic dicarboxylic acid, a2) 20-100% in moles of units deriving from at least one saturated aliphatic dicarboxylic acid, and a3) 0-5% in moles of units deriving from at least one unsaturated aliphatic dicarboxylic acid; and a1) 0-80% in moles of units deriving from at least aromatic dicarboxylic acid, a2) 20-100% in moles of units deriving from at least one saturated aliphatic dicarboxylic acid, and a3) 0-5% in moles of units deriving from at least one unsaturated aliphatic dicarboxylic acid; and b) a diol component comprising, with respect to the total for the diol component: b1) 95-100% in moles of units deriving from at least one saturated aliphatic diol, and b2) 0-5 % in moles of units deriving from at least one unsaturated aliphatic diol; b1) 95-100% in moles of units deriving from at least one saturated aliphatic diol, and b2) 0-5 % in moles of units deriving from at least one unsaturated aliphatic diol; ii. 0-6% by weight of at least one dihydroxyl compound having the formula C n H 2n 2 in which "n" is from 2 to 14; iii. 10-55% by weight of at least one cross-linking and/or chain extender agent comprising at least one compound having two and/or multiple functional groups comprising isocyanate, peroxide, carbodiimide, oxazoline, epoxy, anhydride and divinylether groups and mixtures thereof wherein said agent iii. comprises at least 25% by weight of at least one compound having two and/or multiple functional groups including isocyanate groups; iv. 2-45% by weight of at least one compound containing silicon selected from (3- glycidyloxypropyl)trimethoxysilane, (3-isocyanatopropyl) triethoxysilane and organosilanes having at least one sulfur atom; v. 0-60% by weight of at least one thermoplastic polyolefin having a melting point ≤140°C; and vi. 0-40%) by weight of water.