US4671987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printable composite stretch wrap film
Assignee: El Paso Products Co
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Filing: 1986-04-07
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Granted: 1987-06-09
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Expires: 2006-04-07
Abstract
Abstract Printable high strength, thin stretch wrap composite films exhibiting excellent self-adherence without heat sealing are comprised of at least two layers, wherein one outside layer is comprised of a tackified ethylene-vinyl acetate copolymer and the other outside layer of a very low density polyethylene copolymer having a density below 0.915. Optionally, a third inside layer of liner low density polyethylene is present in the composite film.
Inventors
- 👤 II Jack E. Knott
- 👤 Kenneth W. Obitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:48
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B2307/00; B32B2307/40; B32B2307/406; B32B2307/70; B32B2307/73; B32B2307/75; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/31801; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
72 words
A printable composite stretch-wrapp film comprising (A) a first layer of a blend of (1) an ethylene-vinyl acetate copolymer (EVA) containing from about 2 to about 25 wt % of polymerized vinyl acetate groups and (2) a tackifier; and (B) a second layer free of tackifier and comprised of at least about 50 wt % of a linear, nonpolar, very low density polyethylene (VLDPE) having a specific gravity of below 0.915 gms/cc.
Claim 2
Dependent Claim
72 words
A printable composite stretch-wrapp film comprising (A) a first layer of a blend of (1) an ethylene-vinyl acetate copolymer (EVA) containing from about 2 to about 25 wt % of polymerized vinyl acetate groups and (2) a tackifier; and (B) a second layer free of tackifier and comprised of at least about 50 wt % of a linear, nonpolar, very low density polyethylene (VLDPE) having a specific gravity of below 0.915 gms/cc.
Claim 3
Dependent Claim
16 words
The film of claim 1 further comprising an intermediate layer of linear low density polyethylene (LLDPE).
Claim 4
Dependent Claim
29 words
The film of claim 1 wherein the tackifier is selected from the group consisting of sorbitan monooleate, glycerol monooleate, low molecular weight polyisobutylene, amorphous polypropylene, polyterpenes and microcrystalline wax.
Claim 5
Dependent Claim
24 words
The film of claim 1 wherein the tackifier is present in blend (A) in amounts ranging from about 0.5 to about 6.0 wt %.
Claim 6
Dependent Claim
21 words
The film of claim 1 wherein the EVA contains between about 4 and about 16 wt % polymerized vinyl acetate groups.
Claim 7
Dependent Claim
19 words
The film of claim 1 wherein the VLDPE has a density ranging from about 0.90 and to below 0.915.
Claim 8
Dependent Claim
42 words
The film of claim 1 wherein the VLDPE of (B) is blended with from 0 to about 50 wt % of an ethylene polymer selected from the group connisting of polyethylene homopolymer, ethylenevinyl acetate copolymer, linear low density polyethylene and mixtures thereof.
Claim 9
Dependent Claim
18 words
The film of claim 2 wherein the LLDPE has a density ranging from about 0.916 to about 0.928.
Claim 10
Dependent Claim
17 words
The film of claim 1 having a total thickness ranging from about 0.2 to about 2 mil.
Claim 11
Dependent Claim
17 words
The film of claim 1 having a total thickness ranging from about 0.3 to about 1.5 mil.
Claim 12
Dependent Claim
17 words
The film of claim 1, wherein the thickness of each layer is at least about 0.1 mil.
Claim 13
Dependent Claim
16 words
The film of claim 1 wherein the LLDPE resin is a copolymer of ethylene and octene-1.
Claim 14
Dependent Claim
10 words
The film of claim 1 wherein the tackifier is polyisobutylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |