Introduction
Active food packaging technology encompasses systems that incorporate active substances into the polymeric matrix.
The embedded components exhibit antimicrobial, antifungal, antioxidant properties and are able to absorb or reduce oxygen, carbon dioxide or ethylene, thereby enhancing the quality and safety of food products.[1]
The utilization of two-dimensional materials, such as graphene, has facilitated the advent of novel avenues for the advancement of active packaging (AP). The integration of these materials with polymers has the potential to enhance the barrier, thermal, and mechanical properties of packaging.[2,3]
The objective of this paper is to provide a comprehensive overview of patented two-dimensional materials in the field of active packaging.
Methods
Patent searches were carried out using Espacenet, a database provided by the European Patent Office using a combination of keywords in the title/abstract/claims search fields with Boolean and proximity operators and classification codes.
Results
China is the country with the highest number of patent applications filed for 2D-materials in AP technology, followed by the United States, and Japan. A significant number of applicants opted to utilize the PCT procedure, which permits the postponement of entry into the national phases.
The number of patent applications filed has increased significantly from 2016 to 2022.
Graphene and graphene oxide are the most frequently claimed compounds in patents, followed by layered double hydroxides and hexagonal boron nitride.
Other two-dimensional materials, such as transition metal dichalcogenides, reduced graphene oxide, MXenes and graphitic carbon nitrides (g-C3N4), have been the subject of fewer patent applications.
Conclusions
China, the USA and Japan are the countries with the highest number of filings. In terms of the materials most frequently claimed in patent applications, carbon allotropes are the most prevalent.
