Patent US4820589A successfully refreshed from Google Patents.
US4820589A
Expired / Lapsed
US
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Cling/no cling-slip stretch wrap film
Assignee: Pactiv LLC
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Filing: 1988-06-01
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Granted: 1989-04-11
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Expires: 2008-06-01
Abstract
Abstract A stretch wrap film having one-sided cling of a thermoplastic A/B layer film structure wherein layer A in its stretched condition has a comparatively high cling force to layer B and layer B has at least substantially no cling force to a layer of itself and has a slide property when layer B is in contact with a layer of itself with relative motion therebetween and the surface of layer B presents sufficient area of an organic polymer which of its very nature causes the no cling force and the slide property.
Inventors
- 👤 David V. Dobreski
- 👤 Robert J. Metz
- 👤 James Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:33
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B7/00; B32B7/02; B32B7/022; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
116 words
In a stretch wrap film having one-sided cling comprising a thermoplastic A/B layer film structure where, with the surfaces of A/B in their stretched condition, the A surface has a comparatively high cling force to the surface of B and the surface of B has no cling force to itself and has a slide property when the surface of B is in contact with itself with relative motion therebetween, the improvement comprising wherein the surface of B presents at least a sufficient area of another thermoplastic organic polymer of a member selected from the group consisting of a polyamide and a polyfluoro-olefin which of its very nature causes said no cling force and said slide property.
Claim 2
Dependent Claim
116 words
In a stretch wrap film having one-sided cling comprising a thermoplastic A/B layer film structure where, with the surfaces of A/B in their stretched condition, the A surface has a comparatively high cling force to the surface of B and the surface of B has no cling force to itself and has a slide property when the surface of B is in contact with itself with relative motion therebetween, the improvement comprising wherein the surface of B presents at least a sufficient area of another thermoplastic organic polymer of a member selected from the group consisting of a polyamide and a polyfluoro-olefin which of its very nature causes said no cling force and said slide property.
Claim 3
Dependent Claim
13 words
The film of claim 1 wherein said another organic polymer is a polyamide.
Claim 4
Dependent Claim
21 words
The film of claim 2 wherein said polyamide is present in said B layer in from 0.1% to 100% by weight.
Claim 5
Dependent Claim
11 words
The film of claim 2 wherein said polyamide is a nylon.
Claim 6
Dependent Claim
15 words
The film of claim 4 wherein said layer A and layer B comprise a polyolefin.
Claim 7
Dependent Claim
11 words
The film of claim 5 wherein said polyolefin is generically polyethylene.
Claim 8
Dependent Claim
21 words
The film of claim 6 wherein said polyethylene is a copolymer of ethylene and a C 4 -C 10 alpha olefin.
Claim 9
Dependent Claim
13 words
The film of claim 1 wherein said another organic polymer is a polyfluoro-olefin.
Claim 10
Dependent Claim
21 words
The film of claim 8 wherein said polyfluoro-olefin is present in said B layer in from 0.1% to 100% by weight.
Claim 11
Dependent Claim
15 words
The film of claim 8 wherein said layer A and layer B comprise a polyolefin.
Claim 12
Dependent Claim
11 words
The film of claim 10 wherein said polyolefin is generically polyethylene.
Claim 13
Dependent Claim
21 words
The film of claim 11 wherein said polyethylene is a copolymer of ethylene and a C 4 -C 10 alpha olefin.
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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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |