Multilayer Films and Methods of Making the Same
AssigneeExxonMobil Chemical Patents Inc.
InventorsAchiel J. M. Van Loon, Danny Van Hoyweghen
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Abstract
Disclosed are multilayer films with high toughness performance, where the films have an elastic ethylene copolymer in the core layer.
Claims25
A multilayer film comprising a first layer, a second layer, and a third layer between the first layer and the second layer, wherein the third layer comprises 100 wt % of a first ethylene copolymer, based on total weight of polymer in the third layer;
- wherein the multilayer film has at least one of the following properties:
- (i) a tear resistance of at least about 6% higher in the Machine Direction (MD);
- (ii) a tear resistance of at least about 12% higher in the Transverse Direction (TD);
- and (iii) a dart impact of at least about 12% higher, compared to that of a film free of the first ethylene copolymer, but is otherwise identical in terms of film structure, layers' compositions and the film's overall thickness.
A method for making a multilayer film, comprising the steps of:
- (a) preparing a first layer and a second layer;
- (b) preparing a third layer between the first layer and the second layer, the third layer comprising 100 wt % of a first ethylene copolymer, based on total weight of polymer in the third layer;
- and
- (c) forming a film comprising the layers in steps (a) and (b),
- wherein the multilayer film has at least one of the following properties:
- (i) a tear resistance of at least about 6% higher in the MD;
- (ii) a tear resistance of at least about 12% higher in the TD;
- and (iii) a dart impact of at least about 12% higher, compared to that of a film free of the first ethylene copolymer, but is otherwise identical in terms of film structure, layers' compositions and the film's overall thickness.
A multilayer film comprising a plurality of layers, the plurality of layers comprising a first ethylene copolymer layer comprising 100 wt % of a first ethylene copolymer, based on total weight of polymer in the third layer;
- wherein the multilayer film has at least one of the following properties:
- (i) a tear resistance of at least about 25% higher in each of a Machine Direction (MD) and a Transverse Direction (TD);
- and (ii) a dart impact of at least about 25% higher, compared to that of a film free of the first ethylene copolymer, but is otherwise identical in terms of film structure, layer compositions and overall film thickness.
Dependencies are inferred from the claim text.