Biaxially-oriented polyethylene multilayer film with a matte surface
AssigneeDow Global Technologies LLC
InventorsGang Wang, Xiaobing Yun, Jianping Pan, Jingyi Xu
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Abstract
A biaxially-oriented polyethylene (BOPE) multilayer film comprises a skin layer with a matte surface and a core, the skin layer with a matte surface comprising, in weight percent (wt %) based upon the weight of the skin layer: (1) from 20 to 80 wt % of an ethylene-based polymer, and (2) from 80 to 20 wt % of a propylene-based polymer; each of the ethylene-based polymer and the propylene-based polymer having a storage modulus, with a difference between the storage modulus of the ethylene-based polymer and the propylene-based polymer of greater than 40 megaPascals (MPa) at 110° C., and greater than 18 MPa at 120° C.
Claims18
A biaxially-oriented polyethylene (BOPE) multilayer film comprising a skin layer with a matte surface and a core, the core comprising one or more layers, the film characterized by the following:
- (A) the skin layer with a matte surface comprising, in weight percent (wt %) based upon the weight of the skin layer:
- (1) from 20 to 80 wt % of an ethylene-based polymer, the ethylene-based polymer in the skin layer is an ethylene/C4-C8 α-olefin copolymer with a density from 0.910 g/cc to 0.930 g/cc, and
- (2) from 80 to 20 wt % of a propylene-based polymer;
- each of the ethylene-based polymer and the propylene-based polymer having a storage modulus, with a difference between the storage modulus of the ethylene-based polymer and the propylene-based polymer of greater than 40 MPa at 110° C., and greater than 18 MPa at 120° C.;
- (B) the matte surface of the skin layer has a gloss of less than 50% as measured by ASTM D2457 at an angle of 45°;
- (C) the core comprising at least 50 wt % of an ethylene-based polymer based on the weight of all of the core layers;
- (D) the film having a thickness, and the core comprising at least 50% of the film thickness;
- and
- (E) the film is oriented in the machine direction at a draw ratio from 2:1 to 6:1, and in the cross direction from 2:1 to 11:1.
Dependencies are inferred from the claim text.