US 11,833,789 B2
Biodegradable and compostable film with an increased barrier effect to aeriform fluids
Sergio Messina, Rome (IT)
Assigned to 3 MP HOLDING S.R.L., Rome (IT)
Appl. No. 17/622,113
Filed by 3 MP HOLDING S.r.l., Rome (IT)
PCT Filed Sep. 6, 2019, PCT No. PCT/IT2019/000069
§ 371(c)(1), (2) Date Dec. 22, 2021,
PCT Pub. No. WO2021/024280, PCT Pub. Date Feb. 11, 2021.
Claims priority of application No. 102019000014403 (IT), filed on Aug. 8, 2019.
Prior Publication US 2022/0363040 A1, Nov. 17, 2022
Int. Cl. B32B 27/08 (2006.01); B32B 7/027 (2019.01); B32B 7/12 (2006.01); B32B 27/20 (2006.01); B32B 27/36 (2006.01); B65D 65/40 (2006.01); B65D 65/46 (2006.01)
CPC B32B 27/08 (2013.01) [B32B 7/027 (2019.01); B32B 7/12 (2013.01); B32B 27/20 (2013.01); B32B 27/36 (2013.01); B65D 65/40 (2013.01); B65D 65/466 (2013.01); B32B 2250/244 (2013.01); B32B 2255/10 (2013.01); B32B 2255/20 (2013.01); B32B 2255/205 (2013.01); B32B 2264/104 (2013.01); B32B 2307/30 (2013.01); B32B 2307/7163 (2013.01); B32B 2307/72 (2013.01); B32B 2307/732 (2013.01); B32B 2307/75 (2013.01); B32B 2439/70 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A base structure, which substantially is permeable to light radiation, for making a biodegradable and compostable film as set out by Standard EN 13432 of the European Committee for Standardization, for packaging perishable goods, said base structure comprising:
a first layer consisting of:
a first biodegradable and compostable product as set out by Standard EN 13432 of the European Committee for Standardization,
said first product being a thermoplastic material:
being processable by blowing extrusion,
comprising polyester,
having a density determined according to test ASTM D792 at 23° C., equal to 1.22 g/cm3
and
having a melt mass flow index determined according to Standard ISO 1133-1, equal to 3.5 g/10 min at 190° C. and for 2.16 kg,
said first product being present in said first layer in a quantity which is not less than 83.5% in weight;
a first biodegradable and compostable additive as set out by Standard EN 13432 of the European Committee for Standardization,
said first additive comprising 67% calcium carbonate in weight and 33% compostable resin in weight as set out by Standard EN 13432 of the European Committee for Standardization,
said first additive having a density of 1.9 g/cm3,
said first additive being present in said first layer in a quantity between 5% in weight and 15% in weight;
a second biodegradable and compostable additive as set out by Standard EN 13432 of the European Committee for Standardization,
said second additive having:
a melting temperature determined according to test ASTM D3418, equal to 118° C. and
a density determined according to test ASTM D792 at 23° C., equal to 1.18 g/cm3, said second additive being present in said first layer in a quantity between 0.5% in weight and 1.5% in weight,
said first layer having a thickness between 4 μm and 20 μm;
a second layer consisting of:
said first product in a quantity between 40% in weight and 60% in weight;
a second biodegradable and compostable product as set out by Standard EN 13432 of the European Committee for Standardization,
said second product being a thermoplastic material:
being processable by blowing extrusion,
comprising polyester,
having a density determined according to test ASTM D792 at 23° C., equal to 1.23 g/cm3
and
having a melt mass flow index determined according to ASTM D1238, equal to 4 g/10 min at 190° C. and for 2.16 kg,
said second product being present in said second layer in a quantity between 40% in weight and 60% in weight,
said second layer overlapping said first layer and having a thickness which substantially is equal to the one of said first layer;
a third layer consisting of:
said first product in a quantity which is not less than 98.5% in weight;
said second additive in a quantity between 0.5% in weight and 1.5% in weight,
said third layer overlapping said second layer so that the second layer is interposed between said first and third layers,
said third layer having a thickness which substantially is equal to the one of said first layer.