SORTING SHRINK FILM Russian patent published in 2022 - IPC B32B27/08 B32B27/32 B29C48/08 B29C48/18 

FIELD: low density polyethylene.

SUBSTANCE: invention relates to a multilayer sorting shrink film comprising at least the following layers: A) a layer comprising the following components: a1) a multimodal ethylene polymer with at least two different comonomers selected from alpha-olefins having from 4 to 10 carbon atoms, wherein the multimodal ethylene polymer has a density of 910 to 935 kg/m³ and a ratio Mw/Mn of a weight average molecular weight Mw to a number average molecular weight Mn of 2 to 8; a2) a multimodal terpolymer of ethylene and two alpha-olefin comonomers, where the multimodal terpolymer has a density of 930 to 950 kg/m³ and Mw/Mn of 10 to 20, and a3) low density polyethylene LDPE; B) a layer comprising at least the following components: b1) recycled LDPE and b2) a multimodal ethylene terpolymer and two alpha-olefin comonomers, where the multimodal terpolymer has a density of 930 to 950 kg/m³ and Mw/Mn of 10 to 20. The invention also discloses a process for making a film according to the present invention and an application for secondary packaging.

EFFECT: invention provides creation of a multi-layer heat-shrinkable sorting film that allows the use of a large amount of recycled LDPE with low or no holes formation, has very good mechanical properties without increasing the film thickness, good optical properties of the surface layer, shrinkage properties and a good balance between holding force and cold properties shrinkage.

16 cl, 1 tbl