Process for manufacturing a polymer composition comprising: a) Preparing a hydrotalcite intercalated with active molecules, having the formula [M 1-x M x 2] x+ [A n- x/n] x ·mS wherein: M = Mg, Zn, Cu, Mn, Co, Fe, Ni; M = Al, Mn, Fe, Co, Ni, Cr, Ga; x = 0.2-0.4; A n- is the intercalated anion of the active molecule with charge n-; m = number of molecules of co-intercalated solvent; S = co-intercalated solvent said hydrotalcite intercalated with active molecules being prepared by reacting in a single step a solution of salts of the metals M and M with a solution containing the anion A n- of the active molecule A, at a temperature between 10 and 60 °C and at a pressure between 90 and 110 KPa, and by adjusting the pH of the solution to ≥ 7 to cause precipitation of the intercalated hydrotalcite thus formed, said single reaction step being followed by the steps of collecting the precipitated intercalated hydrotalcite, washing it with water and drying it until it contains less than 5% wt. of liquid; b) Dispersing said hydrotalcite that contains less than 5% wt. of liquid and is intercalated with active molecules in a polymer matrix that contains less than 5% wt. of water; characterized in that: - said hydrotalcite intercalated with active molecules has a Powder X-Ray Diffraction (PXRD) pattern in which the reflection peaks at 2θ degrees lower than 12° 2θ have a width measured at half-height of the peak of ≥2° 2θ; and - said polymer composition is prepared by dispersing said hydrotalcite that contains less than 5% wt. of liquid in said polymer matrix that contains less than 5% wt. of water; and - said active molecule is selected from the group consisting of antimicrobial, antioxidants, antimycotics; and - said active molecule is present in a quantity between 1-50% by weight with respect to the hydrotalcite. a) Preparing a hydrotalcite intercalated with active molecules, having the formula [M 1-x M x 2] x+ [A n- x/n] x ·mS wherein: M = Mg, Zn, Cu, Mn, Co, Fe, Ni; M = Al, Mn, Fe, Co, Ni, Cr, Ga; x = 0.2-0.4; A n- is the intercalated anion of the active molecule with charge n-; m = number of molecules of co-intercalated solvent; S = co-intercalated solvent said hydrotalcite intercalated with active molecules being prepared by reacting in a single step a solution of salts of the metals M and M with a solution containing the anion A n- of the active molecule A, at a temperature between 10 and 60 °C and at a pressure between 90 and 110 KPa, and by adjusting the pH of the solution to ≥ 7 to cause precipitation of the intercalated hydrotalcite thus formed, said single reaction step being followed by the steps of collecting the precipitated intercalated hydrotalcite, washing it with water and drying it until it contains less than 5% wt. of liquid; M = Mg, Zn, Cu, Mn, Co, Fe, Ni; M = Al, Mn, Fe, Co, Ni, Cr, Ga; x = 0.2-0.4; A n- is the intercalated anion of the active molecule with charge n-; m = number of molecules of co-intercalated solvent; S = co-intercalated solvent said hydrotalcite intercalated with active molecules being prepared by reacting in a single step a solution of salts of the metals M and M with a solution containing the anion A n- of the active molecule A, at a temperature between 10 and 60 °C and at a pressure between 90 and 110 KPa, and by adjusting the pH of the solution to ≥ 7 to cause precipitation of the intercalated hydrotalcite thus formed, said single reaction step being followed by the steps of collecting the precipitated intercalated hydrotalcite, washing it with water and drying it until it contains less than 5% wt. of liquid; b) Dispersing said hydrotalcite that contains less than 5% wt. of liquid and is intercalated with active molecules in a polymer matrix that contains less than 5% wt. of water; - said hydrotalcite intercalated with active molecules has a Powder X-Ray Diffraction (PXRD) pattern in which the reflection peaks at 2θ degrees lower than 12° 2θ have a width measured at half-height of the peak of ≥2° 2θ; and - said polymer composition is prepared by dispersing said hydrotalcite that contains less than 5% wt. of liquid in said polymer matrix that contains less than 5% wt. of water; and - said active molecule is selected from the group consisting of antimicrobial, antioxidants, antimycotics; and - said active molecule is present in a quantity between 1-50% by weight with respect to the hydrotalcite.