US 2020/0269557 A1 · ACTIVE POLYSTYRENE FILM

Abstract

The present invention belongs to the field of active polymer materials. Specifically, it relates to an active polystyrene film that has antimicrobial or antioxidant activity and the method of production of said film. It also refers to wrappers, packages and slice separators (interleavers) that comprise said film.

Claims34

Dependent claims

A polystyrene film for applications in contact with food products, said film including at least one layer comprising:

60-75% (w/wt) polystyrene crystal (PS);
10-35% (w/wt) ethylene copolymer with polar monomers (EMP) with a comonomer content of 15-40% w/wEMP;
an active substance selected from the group consisting of an antioxidant agent and an antimicrobial agent;
0.5%-2% (w/wt) migration agent (MA);
and,
0-15% (w/wt) emulsifying agent (EA) with an HLB greater than 8, being 3-15% when the active substance is an antimicrobial agent,
wherein a PS/(EMP+EA) ratio is between 1.2 and 7.5.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/759,395Filed 24 Oct 2018

Priority

ES P20173126127 Oct 2017

Published

27 Aug 2020

Term ends

Not estimatedThe source records don’t support an estimate.

Classification25 codes

B32B 27/16
Layered products comprising a layer of synthetic resin: specially treated, e.g. irradiated
B32B 27/302
Comprising vinyl polymers; comprising acrylic polymers: comprising aromatic vinyl polymers, e.g. styrenic polymers
B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/18
Layered products comprising a layer of synthetic resin: characterised by the use of special additives

Abstract

Claims34

Dependent claims

A polystyrene film for applications in contact with food products, said film including at least one layer comprising:

60-75% (w/wt) polystyrene crystal (PS);
10-35% (w/wt) ethylene copolymer with polar monomers (EMP) with a comonomer content of 15-40% w/wEMP;
an active substance selected from the group consisting of an antioxidant agent and an antimicrobial agent;
0.5%-2% (w/wt) migration agent (MA);
and,
0-15% (w/wt) emulsifying agent (EA) with an HLB greater than 8, being 3-15% when the active substance is an antimicrobial agent,
wherein a PS/(EMP+EA) ratio is between 1.2 and 7.5.

4 more elements

Dependencies are inferred from the claim text.

Active polystyrene film

Life of this patent

Abstract

Claims34

Active polystyrene film

Life of this patent

Abstract

Claims34