Laminate structure for biocompatible barrier packaging

A flexible laminate structure comprising an alternating stack of layers of different types of polymer A and polymer B having the sequence -A-[B-A-]n with n from 4 to 36, a layer thickness of layers A and B of less than 3 μm, wherein A and B are thermoplastic polymers based at least partly on renewable sources, the thermoplastic polymer A is a polyamide, a nucleated polyamide, a blend of a polyamide with an ethylene vinyl alcohol copolymer, a poly(alkylene carbonate), a poly(alkylene succinate), a polyketone, an ionomer, a copolymer of an bio-olefin with a carboxylic acid or ester or ionomer or mixture thereof, a maleic anhydride grafted polyolefin or bio-olefin carboxylic acid or ester copolymer or ionomer, a blend of a maleic anhydride grafted bio-polyolefin or bio-olefin carboxylic acid or ester copolymer or ionomer with a non grafted bio-polyolefin or bio-olefin carboxylic acid or ester copolymer or ionomer, the thermoplastic polymer B is an ethylene vinyl alcohol copolymer, a polyketone, a polyvinyl alcohol, polyalkylene carbonate, poly(1,3-glycerol carbonate), poly(1,3-glycerol carbonate) mixed with polytetramethylene succinate, or a mixture of polyamide with ethylene vinyl alcohol copolymer or polyketone or polyvinyl alcohol copolymer or polyalkylene carbonate and the thermoplastic polymer B has functional barrier properties against transmission of oxygen, nitrogen, carbon dioxide, organic vapors and moisture, wherein the structure has a water vapor transmission rate of less than 5 g H2O per m2 in 24 hours at 23° C. and 85 Vol.-% relative humidity (DIN 53122) and an oxygen transmission rate of less than 10 cm3 O2 per m2 in 24 hours at 23° C. and 50 Vol.-% relative humidity (ASTM D 3985).