Patent US3805792A successfully refreshed from Google Patents.
US4518654A
Expired / Lapsed
US
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One-sided cling stretch wrap
Assignee: Tyco Plastics Services AG
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Filing: 1983-12-23
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Granted: 1985-05-21
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Expires: 2003-12-23
Abstract
Abstract A stretch wrap film having one sided cling comprising a thermoplastic A/B film structure wherein layer A in 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.
Inventors
- 👤 George N. Eichbauer
- 👤 Beth A. LeBlanc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:02
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B7/00; B32B7/02; B32B7/022; B32B27/18; B32B27/32; B32B27/322; B32B2307/00; B32B2307/70; B32B2307/718; B32B2323/00; B32B2323/04; B32B2323/046; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31924; Y10T428/31928
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
65 words
A stretch wrap film having one-sided cling comprising a transparent thermoplastic A/B 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.
Claim 2
Dependent Claim
65 words
A stretch wrap film having one-sided cling comprising a transparent thermoplastic A/B 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.
Claim 3
Dependent Claim
66 words
The film of claim 1 wherein layer A contains a cling additive dispersed therein, said cling additive being of a character and in an amount sufficient to maintain film A, in its stretched condition, in cling-contact with layer B, and wherein layer B contains an anti-cling additive of a character and an amount sufficient prevent at least any substantial cling force to a layer of itself.
Claim 4
Dependent Claim
12 words
The film of claim 2 wherein layers A and B are polyolefins.
Claim 5
Dependent Claim
13 words
The film of claim 3 wherein layers A and B are generically polyethylene.
Claim 6
Dependent Claim
48 words
The film of claim 4 wherein layer A comprises a linear low density polyethylene, said linear low density polyethylene consisting essentially of ethylene co-polymerized with a minor amount of at least one alpha-olefin having 4 to 10 carbon atoms and wherein layer B is a low density polyethylene.
Claim 7
Dependent Claim
54 words
The film of claim 5 wherein said linear low density polyethylene has a density of from about 0.905 to about 0.940 gm/c.c. and a melt index of about 1-6 and said low density polyethylene has a density of about 0.905 to about 0.940 gm/c.c. and a melt index of between about 1 and 7.
Claim 8
Dependent Claim
40 words
The film of claim 6 wherein said linear low density polyethylene has been formed by copolymerization of ethylene with from about 1-10% by weight of a member selected from the group consisting of butene-1;3-methyl-butene-1;3-methyl-pentene-1;4-methyl-pentene-1; 3-methyl-hexene-1; octene-1; decene-1 and mixtures thereof.
Claim 9
Dependent Claim
28 words
The film of claim 7 wherein said cling additive is a member selected from the group consisting of an amorphorous polypropylene, polyisobutylene, ethylene vinyl acetate, and a polyterpene.
Claim 10
Dependent Claim
25 words
The film of claim 7 wherein said anti-cling additive is a member selected from the group consisting of a highly subdivided silica and a silicate.
Claim 11
Dependent Claim
24 words
The film of claim 7 wherein said cling additive is a polyisobutylene and said anti-cling additive is a highly subdivided synthetic sodium aluminum silicate.
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) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |