Sunday, November 23, 2008

US Patent 7452592 - Biopolymer nanoparticle oxygen barrier

This patent from Innovia Films teaches food packaging serving as an oxygen barrier which can be made cheaper and more ecologically efficient via the use of biopolymer nanoparticles. Claim 1 reads:

1. A substantially planar self-supporting sheet comprising on at least one side thereof a substantially continuous adherent coating thereon to create a barrier to oxygen, the coating comprising biopolymer nanoparticles in an amount of at least 20% by dry weight of the coating, forming a substantially continuous phase on the sheet, said biopolymer nanoparticles obtained from a mechanical thermoplastic process comprising a cross-linking step using a cross-linking agent.