FIELD: chemistry.
SUBSTANCE: invention relates to coated film, not less than 100 mcm thick, containing in fact biodegradable substrate, which contains biodegradable coating on the surface, with weight of coating being not more than 12 g/m2, where coated film is characterised by rate of water vapour penetration, tropical conditions, 38°C, 90% RH, lower than 20 g/m2/day and/or where coated film has welding strength higher than 300 g/25 mm with welding at 135°C with half-second exposure time at pressure 0.7031 kg/cm2. Method of obtaining claimed film by method of pouring from melt and product are also described.
EFFECT: good sealing properties and increased properties of welding of certified biodegradable coated film.
15 cl, 10 tbl, 3 ex
