Biaxially oriented film

Inventors: Jingbo Wang (Linz, AT); Friedrich Berger (Linz, AT); Juulia Hirvonen (Porvoo, FI); Arnaud Alabrune (Courbevoie, FR); Elisabeth Potter (Linz, AT); Tuan Anh Tran (Linz, AT)

Assignee: BOREALIS AG

C08J5/18 C08J2323/08

View Patent ↗

Loading inventors, assignments & file history…

Monitor This Case

Get email alerts when status or documents change.

Order Certified Copies

Most orders are placed with the USPTO same day — all within 24 business hours.

Order via The Patent Place →

Pre-filled with this patent's details

Quick Facts

Patent No.: US 12698371
App. No.: 18/693,849
Granted: Aug 4, 2026
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

The invention provides a biaxially oriented film comprising a multimodal high density polyethylene (HDPE), wherein the multimodal HDPE has a density determined according to ISO 1183 in the range of 952 to 968 kg/m 3 and an MFR2 of 0.3 to 3.0 g/10) min when measured at 190° C. with a load of 2.16 kg according to ISO 1133, and wherein the multimodal HDPE comprises at least two fractions: (C) 30 to 70 wt % relative to the total weight of the multimodal HDPE, of a lower molecular weight fraction being a polyethylene with a density in the range of 955 to 980 kg/m 3 and an MFR2 of 100 to 2000 g/10 min when measured at 190° C. with a load of 2.16 kg according to ISO 1133; and (D) 30 to 70 wt % relative to the total weight of the multimodal HDPE, of a higher molecular weight fraction being a polyethylene with a density in the range of 925 to 970 kg/m 3 and an MFR2 of 0.0001 to 1.0 g/10 min when measured at 190° C. with a load of 2.16 kg according to ISO 1133.

Claims (22)

1 . A biaxially oriented film comprising a multimodal high density polyethylene (HDPE), wherein the multimodal HDPE has a density determined according to ISO 1183 in the range of 952 to 968 kg/m 3 and an MFR 2 of 0.3 to 3.0 g/10 min when measured at 190° C. with a load of 2.16 kg according to ISO 1133, and wherein the multimodal HDPE comprises at least two fractions:

(A) 30 to 70 wt %, relative to the total weight of the multimodal HDPE, of a lower molecular weight fraction being a polyethylene with a density in the range of 955 to 980 kg/m 3 and an MFR 2 of 100 to 2000 g/10 min when measured at 190° C. with a load of 2.16 kg according to ISO 1133; and

(B) 30 to 70 wt %, relative to the total weight of the multimodal HDPE, of a higher molecular weight fraction being a polyethylene with a density in the range of 925 to 970 kg/m 3 and an MFR 2 of 0.0001 to 1.0 g/10 min when measured at 190° C. with a load of 2.16 kg according to ISO 1133;

and wherein said biaxially oriented film is a monolayer film.

2 . The biaxially oriented film as claimed in claim 1 , wherein fraction (A) is present in an amount of 35 to 50 wt %, relative to the total weight of the multimodal HDPE.

3 . The biaxially oriented film as claimed in claim 1 , wherein fraction (B) is present in an amount of 50 to 65 wt %, relative to the total weight of the multimodal HDPE.

4 . The biaxially oriented film as claimed in claim 1 , wherein the multimodal HDPE is bimodal and consists of fractions (A) and (B).

5 . The biaxially oriented film as claimed in claim 1 , wherein the lower molecular weight fraction (A) is an ethylene homopolymer.

6 . The biaxially oriented film as claimed in claim 1 , wherein the higher molecular weight fraction (B) is an ethylene copolymer with at least one alpha-olefin comonomer.

7 . The biaxially oriented film as claimed in claim 1 , wherein said film further comprises 1 to 30 wt %, relative to the total weight of the film, of an HDPE with a density in the range of 955 to 985 kg/m 3 and an MFR 2 of 5 to 100 g/10 min when measured at 190° C. with a load of 2.16 kg according to ISO 1133, and which is different to the multimodal HDPE.

8 . The biaxially oriented film as claimed in claim 1 , wherein said film has a tensile modulus (TM), determined according to ISO 527-3 on 20 μm films in the machine direction (MD) of at least 1000 MPa to 4000 MPa.

9 . The biaxially oriented film as claimed in claim 1 , wherein said film has a haze measured according to ASTM D1003 of 0.5 to 9.0%.

10 . The biaxially oriented film as claimed in claim 1 , wherein said film has a TM/Haze ratio of >115 to 2000.

11 . A laminated film structure comprising the biaxially oriented film as defined in claim 1 laminated to a substrate.

12 . The laminated film structure as claimed in claim 11 wherein the structure consists of polyethylene polymers only.

13 . A method of use of a multimodal HDPE having a density in the range of 952 to 968 kg/m 3 determined according to ISO 1183 and an MFR 2 of 0.3 to 3.0 g/10 min when measured at 190° C. with a load of 2.16 kg according to ISO 1133, and wherein the multimodal HDPE comprises at least two fractions:

A. 30 to 70 wt %, relative to the total weight of the multimodal HDPE, of a lower molecular weight fraction being a polyethylene with a density in the range of 955 to 980 kg/m 3 and an MFR 2 of 100 to 2000 g/10 min when measured at 190° C. with a load of 2.16 kg according to ISO 1133; and

B. 30 to 70 wt %, relative to the total weight of the multimodal HDPE, of a higher molecular weight fraction being a polyethylene with a density in the range of 925 to 970 kg/m 3 and an MFR 2 of 0.0001 to 1.0 g/10 min when measured at 190° C. with a load of 2.16 kg according to ISO 1133;

wherein the method comprises using the multimodal HDPE in the production of the biaxially oriented film as claimed claim 1 , wherein said biaxially oriented film is a monolayer film.

14 . The biaxially oriented film as claimed in claim 1 , wherein fraction (A) is present in an amount of 40 to 50 wt %, relative to the total weight of the multimodal HDPE.

15 . The biaxially oriented film as claimed in claim 1 , wherein fraction (B) is present in an amount of 50 to 60 wt %, relative to the total weight of the multimodal HDPE.

16 . The biaxially oriented film as claimed in claim 6 , wherein the at least one alpha-olefin comonomer comprises butene.