A multilayer polymer film with 3 to 10 layers, characterized in that - a first layer consists of 80 to 99.5 % by weight of polyester and 0.5 to 20 % by weight of additives, based on the total weight of the first layer and comprises pores; - a second layer is bonded to a first surface of the first layer and consists of 50 to 90 % by weight of polyester and 10 to 50 % by weight of additives comprising 1 to 30 % by weight of a first additive selected from chalc, talc, mica, wollastonite, calcium carbonate, bentonite, kaolin, clay, titanium oxide and mixtures thereof, based on the total weight of the second layer; - the polyester of the first and second layer independently from each other are selected from polyethylene terephthalate and polyesters which consist of (i) 80 to 100 mol-% of a diacid residue component selected from terephthalic acid, naphthalene dicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, isophthalic acid and mixtures thereof and (ii) 80 to 100 mol-% of a diol residue component selected from diols containing 2 to 10 carbon atoms, in particular ethylene glycol, and mixtures thereof and 0 to 20 mol-% of a modifying diol selected from 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 1,4-cyclohexanedimethanol, 2,2,4-trimethyl-1,3-pentanediol, propylene glycol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, based on 100 mol-% diacid residues and, respectively 100 mol-% diol residues; - the multilayer polymer film comprises a third layer bonded to a second surface of the first layer opposite to the second layer, the third layer consisting of 90 to 99.5 % by weight of polyester and 0.5 to 10 % by weight of additives, based on the total weight of the third layer and the third layer does not comprise a foaming agent and anorganic particles. - a first layer consists of 80 to 99.5 % by weight of polyester and 0.5 to 20 % by weight of additives, based on the total weight of the first layer and comprises pores; - a second layer is bonded to a first surface of the first layer and consists of 50 to 90 % by weight of polyester and 10 to 50 % by weight of additives comprising 1 to 30 % by weight of a first additive selected from chalc, talc, mica, wollastonite, calcium carbonate, bentonite, kaolin, clay, titanium oxide and mixtures thereof, based on the total weight of the second layer; - the polyester of the first and second layer independently from each other are selected from polyethylene terephthalate and polyesters which consist of (i) 80 to 100 mol-% of a diacid residue component selected from terephthalic acid, naphthalene dicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, isophthalic acid and mixtures thereof and (ii) 80 to 100 mol-% of a diol residue component selected from diols containing 2 to 10 carbon atoms, in particular ethylene glycol, and mixtures thereof and 0 to 20 mol-% of a modifying diol selected from 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 1,4-cyclohexanedimethanol, 2,2,4-trimethyl-1,3-pentanediol, propylene glycol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, based on 100 mol-% diacid residues and, respectively 100 mol-% diol residues; - the multilayer polymer film comprises a third layer bonded to a second surface of the first layer opposite to the second layer, the third layer consisting of 90 to 99.5 % by weight of polyester and 0.5 to 10 % by weight of additives, based on the total weight of the third layer and the third layer does not comprise a foaming agent and anorganic particles.