US5604043A
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US
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Heat shrinkable films containing single site catalyzed copolymers having long chain branching
Assignee: Cryovac LLC
•
Filing: 1993-09-20
•
Granted: 1997-02-18
•
Expires: 2013-09-20
Abstract
Abstract The present invention is directed to a heat-shrinkable, thermoplastic film or bag which contains at least one homogeneous ethylene alpha-olefin copolymer with long chain branching. Oriented films made in accordance with the present invention exhibit improved processability as well as improved physical properties such as resistance.
Inventors
- 👤 Kelly R. Ahlgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:28
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/308; C; C08; C08J; C08J5/00; C08J5/18; B32B2307/00; B32B2307/70; B32B2307/72; B32B2307/732; B32B2307/734; B32B2307/736; B32B2439/00; B32B2439/70; C08F; C08F210/00; C08F210/16; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/3192
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
53 words
A heat shrinkable multilayer film comprising at least one inner core layer comprising a homogeneous single site catalyzed copolymer of ethylene and an alpha-olefin having from four to ten carbon atoms and having at least some long chain branching said copolymer having a density of from about 0.89 g/cc to about 0.91 g/cc.
Claim 2
Dependent Claim
53 words
A heat shrinkable multilayer film comprising at least one inner core layer comprising a homogeneous single site catalyzed copolymer of ethylene and an alpha-olefin having from four to ten carbon atoms and having at least some long chain branching said copolymer having a density of from about 0.89 g/cc to about 0.91 g/cc.
Claim 3
Dependent Claim
19 words
The heat shrinkable film of claim 1 wherein said alpha-olefin having from four to ten carbon atoms is octene.
Claim 4
Dependent Claim
20 words
The heat shrinkable film of claim 1 wherein said homogeneous branched copolymer is blended with another thermoplastic homopolymer or copolymer.
Claim 5
Dependent Claim
52 words
The heat shrinkable film of claim 3 wherein said other thermoplastic homopolymer or copolymer is a copolymer of ethylene and a second comonomer selected from the group consisting of vinyl acetate, alkyl acrylate, carbon monoxide, butadiene, styrene, acrylic acid, methacrylic acid, a metal neutralized salt of an acrylic acid, and an alpha-olefin.
Claim 6
Dependent Claim
55 words
A heat shrinkable multilayer film comprising at least two core layers, each of said core layers comprising a homogeneous single site catalyzed copolymer of ethylene and an alpha-olefin having from four to ten carbon atoms and having at least some long chain branching said copolymer having a density of from about 0.89 to about 0.91.
Claim 7
Dependent Claim
55 words
A heat shrinkable multilayer film comprising at least two core layers, each of said core layers comprising a homogeneous single site catalyzed copolymer of ethylene and an alpha-olefin having from four to ten carbon atoms and having at least some long chain branching said copolymer having a density of from about 0.89 to about 0.91.
Claim 8
Dependent Claim
34 words
The heat shrinkable film set forth in claim 5 wherein the homogeneous branched copolymer of one of said two core layers is identical to the homogeneous branched copolymer of the other of said layers.
Claim 9
Dependent Claim
21 words
The heat shrinkable film set forth in claim 5 wherein the alpha-olefin having from four to ten carbon atoms is octene.
Claim 10
Dependent Claim
20 words
The heat shrinkable film of claim 5 wherein said homogeneous branched copolymer is blended with another thermoplastic homopolymer or copolymer.
Claim 11
Dependent Claim
52 words
The heat shrinkable film of claim 5 wherein said other thermoplastic homopolymer or copolymer is a copolymer of ethylene and a second comonomer selected from the group consisting of vinyl acetate, alkyl acrylate, carbon monoxide, butadiene, styrene, acrylic acid, methacrylic acid, a metal neutralized salt of an acrylic acid, and an alpha-olefin.
Claim 12
Dependent Claim
24 words
The heat shrinkable film of claim 5 wherein the homogeneous branched copolymer has a density of from about 0.90 g/cc to about 0.91 g/cc.
Claim 13
Dependent Claim
52 words
A heat shrinkable multilayer film comprising the general structure: seal/core/barrier/core/abuse wherein each of the core layers comprises the same homogeneous long chain branched single-site catalyzed copolymer of ethylene and an alpha-olefin having from four to ten carbon atoms, said copolymer having a density of from about 0.89 g/cc to about 0.91 g/cc.
Claim 14
Dependent Claim
52 words
A heat shrinkable multilayer film comprising the general structure: seal/core/barrier/core/abuse wherein each of the core layers comprises the same homogeneous long chain branched single-site catalyzed copolymer of ethylene and an alpha-olefin having from four to ten carbon atoms, said copolymer having a density of from about 0.89 g/cc to about 0.91 g/cc.
Claim 15
Dependent Claim
19 words
The heat shrinkable film of claim 11 wherein said alpha-olefin having from four to ten carbon atoms is octene.
Claim 16
Dependent Claim
20 words
The heat shrinkable film of claim 11 wherein said homogeneous branched copolymer is blended with another thermoplastic homopolymer or copolymer.
Claim 17
Dependent Claim
52 words
The heat shrinkable film of claim 13 wherein said other thermoplastic homopolymer or copolymer is a copolymer of ethylene and a second comonomer selected from the group consisting of vinyl acetate, alkyl acrylate, carbon monoxide, butadiene, styrene, acrylic acid, methacrylic acid, a metal neutralized salt of an acrylic acid, and an alpha-olefin.
Claim 18
Dependent Claim
24 words
The heat shrinkable film of claim 11 wherein the homogeneous branched copolymer has a density of from about 0.90 g/cc to about 0.91 g/cc.
Claim 19
Dependent Claim
16 words
The heat shrinkable film of claim 11 wherein the barrier layer comprises a vinylidene chloride copolymer.
Claim 20
Dependent Claim
17 words
The heat shrinkable film of claim 16 wherein the barrier layer comprises a vinylidene chloride-methyl acrylate copolymer.
Claim 21
Dependent Claim
45 words
The heat shrinkable film of claim 111 wherein the seal layer comprises a copolymer of ethylene and a comonomer selected from the group consisting of vinyl acetate, alkyl acrylate, acrylic acid, methacrylic acid, a metal neutralized salt of an acrylic acid, and an alpha olefin.
Claim 22
Dependent Claim
18 words
The heat shrinkable film set forth in claim 11 further including additional internal layers to promote interlayer adhesion.
Claim 23
Dependent Claim
90 words
A heat shrinkable multilayer film comprising: a) a seal layer; b) a first core layer comprising a homogeneous, long chain branched ethylene alpha-olefin copolymer having a density of from about 0.89 g/cc to about 0.91 g/cc; c) a barrier layer; d) a second core layer comprising a homogeneous, long chain branched ethylene alpha-olefin copolymer having a density of from about 0.891 g/cc to about 0.91 g/cc; and e) an abuse layer; wherein the homogeneous, branched ethylene alpha-olefin of the first core layer differs from that of the second core layer.
Claim 24
Dependent Claim
90 words
A heat shrinkable multilayer film comprising: a) a seal layer; b) a first core layer comprising a homogeneous, long chain branched ethylene alpha-olefin copolymer having a density of from about 0.89 g/cc to about 0.91 g/cc; c) a barrier layer; d) a second core layer comprising a homogeneous, long chain branched ethylene alpha-olefin copolymer having a density of from about 0.891 g/cc to about 0.91 g/cc; and e) an abuse layer; wherein the homogeneous, branched ethylene alpha-olefin of the first core layer differs from that of the second core layer.
Claim 25
Dependent Claim
15 words
The heat shrinkable film claim 20 further including additional internal layers to promote interlayer adhesion.
Claim 26
Dependent Claim
91 words
A multilayer heat shrinkable film comprising: a) a sealing layer comprising a homogeneous, single site catalyzed copolymer of ethylene and a alpha-olefin with four to ten carbon atoms, said copolymer having long chain branching and a density of from about 0.89 g/cc to about 0.91 g/cc; b) a barrier layer; and c) an abuse layer comprising a homogeneous single site catalyzed copolymer of ethylene and a alpha-olefin with four to ten carbon atoms, said copolymer having long chain branching and a density of from about 0.89 g/cc to about 0.91 g/cc.
Claim 27
Dependent Claim
91 words
A multilayer heat shrinkable film comprising: a) a sealing layer comprising a homogeneous, single site catalyzed copolymer of ethylene and a alpha-olefin with four to ten carbon atoms, said copolymer having long chain branching and a density of from about 0.89 g/cc to about 0.91 g/cc; b) a barrier layer; and c) an abuse layer comprising a homogeneous single site catalyzed copolymer of ethylene and a alpha-olefin with four to ten carbon atoms, said copolymer having long chain branching and a density of from about 0.89 g/cc to about 0.91 g/cc.
Claim 28
Dependent Claim
65 words
A heat shrinkable multi-layer film comprising the general structure: seal/core/barrier/core/abuse wherein each of the two core layers comprises the same homogeneous copolymer of ethylene and octene having an I 10 /I 2 greater than or equal to 5.63 and a Mw/Mn, less than or equal to (I 10 /I 2 )-4.63, said copolymer having a density of from about 0.89 g/cc to about 0.91 g/cc.
Claim 29
Dependent Claim
65 words
A heat shrinkable multi-layer film comprising the general structure: seal/core/barrier/core/abuse wherein each of the two core layers comprises the same homogeneous copolymer of ethylene and octene having an I 10 /I 2 greater than or equal to 5.63 and a Mw/Mn, less than or equal to (I 10 /I 2 )-4.63, said copolymer having a density of from about 0.89 g/cc to about 0.91 g/cc.
Claim 30
Dependent Claim
29 words
The heat shrinkable film of claim 23 wherein at least one of said core layers further includes another thermoplastic homopolymer or copolymer blended with the homogenous ethylene octene polymer.
Claim 31
Dependent Claim
53 words
The heat shrinkable film of claim 24 wherein said other thermoplastic homopolymer or copolymer is a copolymer of ethylene and a second comonomer selected from the group consisting of vinyl acetate, alkyl acrylate, carbon monoxide, butadiene, styrene, acrylic acid, methylacyrlic acid, a metal neutralized salt of an acrylic acid and an alpha olefin.
Claim 32
Dependent Claim
16 words
The heat shrinkable film of claim 25 further including additional internal layers to promote interlayer adhesion.
Claim 33
Dependent Claim
30 words
A heat shrinkable multilayer film as set forth in claim 26 wherein the homogenous ethylene octene copolymer of said first core layer differs from that of said second core layer.
Claim 34
Dependent Claim
116 words
The heat shrinkable multilayer film comprising: a) a sealing layer; b) a first core layer comprising a homogeneous ethylene octene copolymer having an I 10 /I 2 greater than or equal to 5.63 and an Mw/Mn less than or equal to (I 10 /I 2 )-4.63 and having a density of from about 0.89 g/cc to about 0.91 g/cc; c) a barrier layer; d) a second core layer comprising a homogenous ethylene octene copolymer having an I 10 /I 2 greater than or equal to 5.63 and an Mw/Mn less than or equal to (I 10 /I 2 )-4.63 and having a density of from about 0.89 g/cc to about 0.91 g/cc; e) an abuse layer.
Claim 35
Dependent Claim
116 words
The heat shrinkable multilayer film comprising: a) a sealing layer; b) a first core layer comprising a homogeneous ethylene octene copolymer having an I 10 /I 2 greater than or equal to 5.63 and an Mw/Mn less than or equal to (I 10 /I 2 )-4.63 and having a density of from about 0.89 g/cc to about 0.91 g/cc; c) a barrier layer; d) a second core layer comprising a homogenous ethylene octene copolymer having an I 10 /I 2 greater than or equal to 5.63 and an Mw/Mn less than or equal to (I 10 /I 2 )-4.63 and having a density of from about 0.89 g/cc to about 0.91 g/cc; e) an abuse layer.
Claim 36
Dependent Claim
18 words
The heat shrinkable film set forth in claim 28 further including additional internal layers to promote interlayer adhesion.
Claim 37
Dependent Claim
34 words
The heat shrinkable film set forth in claim 28 wherein the homogenous ethylene octene copolymer of at least one of said first and second core layers is blended with another thermoplastic homopolymer or copolymer.
Claim 38
Dependent Claim
55 words
The heat shrinkable film set forth in claim 30 wherein said other thermoplastic homopolymer or copolymer is a copolymer of ethylene and a second comonomer selected from the group consisting of vinyl acetate, alkyl acrylate, carbon monoxide, butadiene, styrene, acrylic acid, methacrylic acid, a metal neutralized salt of an acrylic acid and an alpha olefin.
Claim 39
Dependent Claim
50 words
A heat shrinkable multi-layer film comprising the general structure: seal/core/abuse wherein the core layer comprises a homogeneous long chain branched single site catalyzed copolymer of ethylene and an alpha-olefin having from four to ten carbon atoms, said copolymer having a density of from about 0.89 g/cc to about 0.91 g/cc.
Claim 40
Dependent Claim
50 words
A heat shrinkable multi-layer film comprising the general structure: seal/core/abuse wherein the core layer comprises a homogeneous long chain branched single site catalyzed copolymer of ethylene and an alpha-olefin having from four to ten carbon atoms, said copolymer having a density of from about 0.89 g/cc to about 0.91 g/cc.
Claim 41
Dependent Claim
52 words
The heat shrinkable film of claim 32 further including a second core layer, said core layer comprising a homogeneous long chain branched single site catalyzed copolymer of ethylene and an alpha-olefin having from four to ten carbon atoms, said copolymer having a density of from about 0.89 g/cc to about 0.91 g/cc.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-18 | 2000-08-19 | 2001-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-18 | 2004-08-19 | 2005-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-18 | 2008-08-19 | 2009-02-18 | $7700.00 | Window Closed / Lapsed |