Patent ID: 11969928
Assignee: VISKASE COMPANIES, INC.
Field: Surface technology, coating (Chemistry)
Classification: CPC B  A  C  G | IPC A  B  C  G

Claim 0:
1. A detectable thermoplastic food packaging film comprising detectable particles incorporated therein in homogeneous distribution,
wherein the detectable particles are permanently magnetic and comprise a hydrophobic surface-modification being at least one of protective against oxygen and protective against oxidation,
wherein the surface-modification of the detectable particles is bonded to the surfaces of the detectable particles,
wherein the detectable particles comprise a weight-related specific saturation magnetization of at least 50 Am2/kg iron (Fe),
wherein the detectable particles comprise absolute particle sizes in the range of from 0.01 to 1,000 micrometers, and
wherein the surface-modification of the detectable particles comprises inorganic, organic or inorganic-organic polymers selected from the group consisting of polysiloxanes, polyacrylates, polymethacrylates, polyacrylamides, starch-based polymers, cellulose-based polymers, polysaccharides, polyaminosaccharides and biopolymers as well as mixtures and combinations thereof;

wherein the detectable thermoplastic food packaging film is a multilayer film comprising:
as a core layer, a plastic film comprising all the detectable particles; and
to opposing sides of the core layer, at least one other plastic film co-extruded with the core layer, each of the at least one other plastic film providing one of outer layers of the multilayer film, each of the at least one other plastic film comprising a plastic material different than that of the core layer;

wherein the plastic film of the core layer comprises a polyethylene resin; and
wherein the plastic material of the at least one other plastic film providing the outer layers comprises a polyamide resin.