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US 12,605,917 B2Granted
Multilayer sheet comprising a foamed layer suitable for food packaging
AssigneeBorealis AG
InventorsAntti Tynys, Yi An Lin
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Abstract
The present invention relates to a multilayer sheet comprising at least two layers (A) and (B) in adherent contact with each other, wherein layer (A) is a foamed sheet comprising a high melt strength polypropylene composition and layer (B) is a coated non-foamed layer, which comprises a polypropylene composition, a process for producing said multilayer sheet, an article comprising said multilayer sheet and the use of said multilayer sheet for the production of an article with improved water vapor transmission and oxygen transmission properties.
Claims12
A multilayer sheet consisting of two layers (A) and (B), wherein:
- layer (A) is a foamed sheet having a density of from 100 to 300 kg/m3, and comprises a high melt strength polypropylene composition comprising from 85.0 to 100 wt % of a high melt strength propylene polymer with long chain branches, based on the total weight amount of the high melt strength polypropylene composition;
- layer (B) is a coated non-foamed layer, which consists of a polypropylene composition comprising from 85.0 to 100 wt % of a linear propylene polymer, based on the total weight amount of the polypropylene composition, wherein the linear polymer of propylene is the only polymeric component in the polypropylene composition, and wherein the polypropylene composition has a melt flow rate MFR2 of 20.0 to 30.0 g/10 min, determined according to ISO 1133;
- wherein layers (A) and (B) are in adherent contact with each other,
- the linear propylene polymer is a linear propylene homopolymer, and the linear polymer of propylene is in the form of a single polymer.
1 more element
Dependencies are inferred from the claim text.