Multi-layer material for packaging

The invention concerns the development of a new class of multi-layer materials for packaging of products that require to be kept in conditions of humidity and gas concentration (in particular oxygen) controlled and constant.

Title of the patent Method of manufacturing a multi-layer material
Thematic area Chemistry and biotechnology
Ownership Alma Mater Studiorum - Università di Bologna
Inventors Vittorio Colombo, Matteo Gherardi, Maria Grazia De Angelis, Marco Giacinti Baschetti, Romolo Laurita, Matteo Minelli
Protection Italy
Licensing status Available for licensing agreement
Keywords Multilayered material, bio-renewable, compostable, oxygen, water, barrier
Filed on Jul 15, 2013

The need to replace the conventional polymeric materials, of petrochemical origin, with biodegradable polymers, compostable and / or from natural sources and bio-renewable is deeply considered, especially in consumer applications such as those related to the packaging. Among biodegradable materials with excellent oxygen barrier properties are the materials based on cellulose fibrils in nanometric dimension.

The invention has as its object the development of a material, starting from renewable raw materials, for food packaging (and not) of products that require a barrier to water and oxygen, such as those subject to the oxidative action. The invention can be exploited for the development of packaging film barrier which preserves the organoleptic and chemical-physical content. Were coupled poly lactic acid (PLA) which gives a good moisture barrier and the micro fibrous cellulose (initially in the form of gel), which provides oxygen barrier: such materials are normally incompatible because the PLA is hydrophobic , while the gel is hydrophilic cellulose.

The multilayer system proposed is able to confer a substantial barrier to both water vapor is oxygen, without the use of coupling agents or adhesives that allow the adhesion of the different layers. The final system is composed only of materials from renewable sources and environmentally friendly.