Multilayer packaging film

A multilayer packaging film comprising at least one layer A and one layer B and having an A/B/A arrangement of said layers where layer A comprises:

• i. 95-100% by weight of the sum of components i.-ii. of a biodegradable aliphatic aromatic polyester with a melt strength of 0.007 N-0.04 N and:
• Mn
• ≥
• 40000
• Mw
• /
• q
• ≤
• 9
• ⁢
• 0
• ⁢
• 0
• ⁢
• 0
• ⁢
• 0
• ,
• where Mn and Mw are the number average molecular weight and the weight average molecular weight respectively, and “q” is the percentage by weight of polyester oligomer having a molecular weight by GPC≤10000;
• where the melt strength is measured according to ISO 16790:2005 at 180° C. and γ=103.7s−1 using a capillary of 1 mm diameter and L/D=30 at a constant acceleration of 6 mm/sec2 and a stretching length of 110 mm;
• “Mn” and “Mw” are measured by gel permeation chromatography (GPC);
• and
• ii. 0-5% by weight of the sum of components i.-ii. of an antifog agent selected from the esters of a polyfunctional alcohol preferably from the condensation products of a polyfunctional alcohol with a fatty acid, provided that said ester is not a stearate;
• and where layer B comprises:
• iii. 60-90% by weight, with respect to the sum of components iii.-v., of at least one polyester comprising:
• a. a dicarboxylic component containing with respect to the total dicarboxylic component:
• a1) 30-60% in moles of units derived from at least one aromatic dicarboxylic acid;
• a2) 70-40% in moles of units derived from at least one saturated aliphatic dicarboxylic acid;
• (a3) in moles of units derived from at least one unsaturated aliphatic dicarboxylic acid;
• b. a diol component comprising with respect to the total diol component
• b1) 95-100% in moles of units derived from at least one saturated aliphatic diol;
• b2) 0-5% in moles of units derived from at least one unsaturated aliphatic diol;
• iv. 10-40% by weight, with respect to the sum of components iii.-v., of one or more polyhydroxyalkanoates;
• and
• v. 0-1% by weight, with respect to the sum of the components iii.-v., of at least one cross-linking agent and/or chain extender;
• further characterised in that the content of component iv. in the multilayer film is between 1.6 and 11% by weight with respect to components i.-v.