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US 2006/0188678 A1Published application
Multi-layer polyethylene films
OwnerStefan Ohlsson, Bart Lauwersinventors
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Abstract
An improved multi-layer film and packaging, including heavy duty sacks made therefrom having improved properties that permit processing on high speed bagging/Form Fill-Seal equipment are disclosed. The multi-layer films of the invention include a mLLDPE-containing skin layer and a core layer that includes both HDPE and mLLDPE.
Claims57
A multi-layer film comprising:
- (a) a first layer comprising at least about 80 wt % of a first mLLDPE having a density of from 0.910 g/cm3 to 0.930 g/cm3 based on the total weight of the first layer;
- (b) a second layer comprising
- (1) from about 60 wt % to about 90 wt % of a HDPE, having a density ranging from about 0.940 g/cm3 to about 0.965 g/cm3 and a melt index ranging from at least about 0.1 g/10 min to about 1.0 g/10 min,
- (2) from about 40 wt % to about 10 wt % of a second mLLDPE, having a density ranging from about 0.910 g/cm3 to about 0.930 g/cm3 and a melt index ranging from about 0.2 g/10 min to about 3.5 g/10 min, and
- (3) optionally, from about 0 wt % to about 10 wt % LDPE,
- wherein the wt % of the HDPE, the LDPE and the second mLLDPE is based on the total weight of the HDPE, the LDPE and the mLLDPE in the second layer;
- and
- (c) a third layer comprising at least about 80 wt % of a third mLLDPE having a density of from 0.910 g/cm3 to 0.930 g/cm3 based on the total weight of the third layer,
- wherein the first mLLDPE, the second mLLDPE and the third mLLDPE may be the same or different, and wherein the second layer is located between the first and the third layers.
6 more elements
A heavy duty sack comprising a multi-layer film comprising:
- (a) a first layer comprising at least about 80 wt % of a first mLLDPE having a density of from 0.910 g/cm3 to 0.930 g/cm3 based on the total weight of the first layer;
- (b) a second layer comprising
- (1) from about 60 wt % to about 90 wt % of a HDPE, having a density ranging from about 0.940 g/cm3 to about 0.965 g/cm3 and a melt index ranging from at least about 0.1 g/10 min to about 1.0 g/10 min,
- (2) from about 40 wt % to about 10 wt % of a second mLLDPE, having a density ranging from about 0.910 g/cm3 to about 0.930 g/cm3 and a melt index ranging from about 0.2 g/10 min to about 3.5 g/10 min, and
- (3) optionally, from about 0 wt % to about 10 wt % LDPE,
- wherein the wt % of the HDPE, the LDPE and the second mLLDPE is based on the total weight of the HDPE, the LDPE and the mLLDPE in the second layer;
- and
- (c) a third layer comprising at least about 80 wt % of a third mLLDPE having a density of from 0.910 g/cm3 to 0.930 g/cm3 based on the total weight of the third layer,
- wherein the first mLLDPE, the second mLLDPE and the third mLLDPE may be the same or different, wherein the second layer is located between the first and third layers, and wherein at least one of the first or third layers forms a seal during production of the heavy duty sack.
6 more elements
A method of making a multi-layer film comprising coextruding:
- (a) a first layer comprising at least about 80 wt % of a first mLLDPE having a density of from 0.910 g/cm3 to 0.930 g/cm3 based on the total weight of the first layer;
- (b) a second layer comprising
- (1) from about 60 wt % to about 90 wt % of a HDPE, having a density ranging from about 0.940 g/cm3 to about 0.965 g/cm3 and a melt index ranging from at least about 0.1 g/10 min to about 1.0 g/10 min,
- (2) from about 40 wt % to about 10 wt % of a second mLLDPE, having a density ranging from about 0.910 g/cm3 to about 0.930 g/cm3 and a melt index ranging from about 0.2 g/10 min to about 3.5 g/10 min, and
- (3) optionally, from about 0 wt % to about 10 wt % LDPE, wherein the wt % of the HDPE, the LDPE and the second mLLDPE is based on the total weight of the HDPE, the LDPE and the mLLDPE in the second layer;
- and
- (c) a third layer comprising at least about 80 wt % of a third mLLDPE having a density of from 0.910 g/cm3 to 0.930 g/cm3 based on the total weight of the third layer, to form the multi-layer film in which the second layer is located between the first and third layers.
4 more elements
A multi-layer film comprising:
- (a) a skin layer comprising at least about 80 wt % of a first mLLDPE having a density of from 0.910 g/cm3 to 0.930 g/cm3 based on the total weight of the skin layer;
- and
- (b) a second layer comprising
- (1) from about 60 wt % to about 90 wt % of a HDPE, having a density ranging from about 0.940 g/cm3 to about 0.965 g/cm3 and a melt index ranging from at least about 0.1 g/10 min to about 1.0 g/10 min,
- (2) from about 40 wt % to about 10 wt % of a second mLLDPE, having a density ranging from about 0.910 g/cm3 to about 0.930 g/cm3 and a melt index ranging from about 0.2 g/10 min to about 3.5 g/10 min, and
- (3) optionally, from about 0 wt % to about 10 wt % LDPE,
- wherein the wt % of the HDPE, the LDPE and the second mLLDPE is based on the total weight of the HDPE, the LDPE and the mLLDPE in the second layer;
- wherein the first mLLDPE and the second mLLDPE may be the same or different.
5 more elements
A packaging material comprising a multi-layer film comprising:
- (a) a first layer comprising at least about 80 wt % of a first mLLDPE having a density of from 0.910 g/cm3 to 0.930 g/cm3 based on the total weight of the first layer;
- (b) a second layer comprising
- (1) from about 60 wt % to about 90 wt % of a HDPE, having a density ranging from about 0.940 g/cm3 to about 0.965 g/cm3 and a melt index ranging from at least about 0.1 g/10 min to about 1.0 g/10 min,
- (2) from about 40 wt % to about 10 wt % of a second mLLDPE, having a density ranging from about 0.910 g/cm3 to about 0.930 g/cm3 and a melt index ranging from about 0.2 g/10 min to about 3.5 g/10 min, and
- (3) optionally, from about 0 wt % to about 10 wt % LDPE, wherein the wt % of the HDPE, the LDPE and the second mLLDPE is based on the total weight of the HDPE, the LDPE and the mLLDPE in the second layer;
- and
- (c) a third layer comprising at least about 80 wt % of a third mLLDPE having a density of from 0.910 g/cm3 to 0.930 g/cm3 based on the total weight of the third layer, wherein the first mLLDPE, the second mLLDPE and the third mLLDPE may be the same or different, wherein the second layer is located between the first and third layers, and wherein at least one of the first or third layers forms a seal during production of the packaging material.
4 more elements
A filled package comprising
- (1) a multi-layer film comprising:
- (a) a first layer comprising at least about 80 wt % of a first mLLDPE having a density of from 0.910 g/cm3 to 0.930 g/cm based on the total weight of the first layer;
- (b) a second layer comprising
- (i) from about 60 wt % to about 90 wt % of a HDPE, having a density ranging from about 0.940 g/cm3 to about 0.965 g/cm3 and a melt index ranging from at least about 0.1 g/10 min to about 1.0 g/10 min,
- (ii) from about 40 wt % to about 10 wt % of a second mLLDPE, having a density ranging from about 0.910 g/cm3 to about 0.930 g/cm3 and a melt index ranging from about 0.2 g/10 min to about 3.5 g/10 min, and
- (iii) optionally, from about 0 wt % to about 10 wt % LDPE, wherein the wt % of the HDPE, the LDPE and the second mLLDPE is based on the total weight of the HDPE, the LDPE and the mLLDPE in the second layer;
- and
- (c) a third layer comprising at least about 80 wt % of a third mLLDPE having a density of from 0.910 g/cm3 to 0.930 g/cm3 based on the total weight of the third layer, wherein the first mLLDPE, the second mLLDPE and the third mLLDPE may be the same or different, wherein the second layer is located between the first and third layers, and wherein at least one of the first or third layers forms a seal during production of the package;
- and
- (2) a filling material encapsulated within the package.
7 more elements
Dependencies are inferred from the claim text.