US4367256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cling-wrap polyethylene film
Assignee: Glad Products Co
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Filing: 1981-05-15
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Granted: 1983-01-04
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Expires: 2001-05-15
Abstract
Abstract A cling wrap plastic film comprising a mixture of high pressure-low density polyethylene (HPLDPE) and low pressure-low density polyethylene (LPLDPE), in which the LPLDPE is between about 5 and about 16 weight % of the LPLDPE plus HPLDPE total weight.
Inventors
- 👤 Edward N. Biel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:50
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/18; B32B27/322; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; B32B2250/00; B32B2250/03; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; C08L2207/00; C08L2207/06; C08L2207/07; C08L23/08; C08L23/0807; C08L23/0815; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
132 words
A cling wrap plastic film comprising: a mixture of high pressure-low density polyethylene (HPLDPE), low pressure-low density polyethylene (LPLDPE), and a cling agent in amount between about 0.5 and about 2.5 wt.% of said film, wherein said HPLDPE has melt index between about 0.5 and about 7.0 gms/10 minutes and density less than about 0.932 gms/cm 3 , said LPLDPE has melt index between between about 0.5 and 4.0 gms/10 minutes and density less than about 0.932 gms/cm 3 , said LPLDPE is between about 5 and about 16 wt.% of the LPLDPE plus HPLDPE total weight for single layer films but between about 5 and about 13 wt.% of the LPLDPE plus HPLDPE total weight for multiple layer films, and the film thickness is between about 0.3 and about 1.5 mils.
Claim 2
Dependent Claim
132 words
A cling wrap plastic film comprising: a mixture of high pressure-low density polyethylene (HPLDPE), low pressure-low density polyethylene (LPLDPE), and a cling agent in amount between about 0.5 and about 2.5 wt.% of said film, wherein said HPLDPE has melt index between about 0.5 and about 7.0 gms/10 minutes and density less than about 0.932 gms/cm 3 , said LPLDPE has melt index between between about 0.5 and 4.0 gms/10 minutes and density less than about 0.932 gms/cm 3 , said LPLDPE is between about 5 and about 16 wt.% of the LPLDPE plus HPLDPE total weight for single layer films but between about 5 and about 13 wt.% of the LPLDPE plus HPLDPE total weight for multiple layer films, and the film thickness is between about 0.3 and about 1.5 mils.
Claim 3
Dependent Claim
31 words
A cling wrap plastic film according to claim 1, in which said film is a single layer and said LPLDPE and said HPLDPE are substantially uniformly distributed through the entire film.
Claim 4
Dependent Claim
38 words
A cling wrap plastic film according to claim 1, in which said film is in the form of multiple layers, and said LPLDPE and said HPLDPE are substantially uniformly distributed through at least one layer of said film.
Claim 5
Dependent Claim
48 words
A cling wrap plastic film according to claim 1, in which said film is in the form of three layers, said LPLDPE and said HPLDPE are substantially uniformly distributed through only the middle layer of said film, and the polyethylene content of the outer layers is only HPLDPE.
Claim 6
Dependent Claim
54 words
A cling wrap plastic film according to claim 4, in which the polyethylene in the outer layers is only HPLDPE, the middle layer LPLDPE comprises between about 15 and about 39 wt.% of the LPLDPE plus HPLDPE total weight in said middle layer, and each of the three layers has about the same thickness.
Claim 7
Dependent Claim
30 words
A cling wrap plastic film according to claim 5, in which said middle layer LPLDPE comprises about 35 wt.% of the LPLDPE plus HPLDPE total weight in said middle layer.
Claim 8
Dependent Claim
36 words
A cling wrap plastic film according to claim 1, in which said film is in the form of three layers, and said LPLDPE and said HPLDPE are substantially uniformly distributed through each layer of said film.
Claim 9
Dependent Claim
35 words
A cling wrap plastic film according to claim 1, in which said film is a single layer and said LPLDPE is between about 10 and about 15 wt.% of the LPLDPE plus HPLDPE total weight.
Claim 10
Dependent Claim
37 words
A cling wrap plastic film according to claim 1, in which said film is in the form of three layers and said LPLDPE is between about 5 and 9 wt.% of the LPLDPE plus HPLDPE total weight.
Claim 11
Dependent Claim
30 words
A cling wrap plastic film according to claim 1, in which said cling agent is a glycerol oleate and comprises between about 0.5 and about 1.5 wt.% of said film.
Claim 12
Dependent Claim
17 words
A cling wrap plastic film according to claim 10, in which said cling agent is glycerol mono-oleate.
Claim 13
Dependent Claim
17 words
A cling wrap plastic film according to claim 10, in which said cling agent is glycerol di-oleate.
Claim 14
Dependent Claim
29 words
A cling wrap plastic film according to claim 1, in which said HPLDPE has melt index of about 2.5 gms/10 minutes and density of about 0.927 gms/cm 3 .
Claim 15
Dependent Claim
29 words
A cling wrap plastic film according to claim 1, in which said LPLDPE has melt index of about 1.0 gms/10 minutes and density of about 0.918 gms/cm 3 .
Claim 16
Dependent Claim
48 words
A cling wrap plastic film according to claim 1, in which said HPLDPE has melt index of about 2.5 gms/10 minutes and density of about 0.927 gms/cm 3 , and said LPLDPE has melt index of about 1.0 gms/10 minutes and density of about 0.918 gms/cm 3 .
Claim 17
Dependent Claim
20 words
A cling wrap plastic film according to claim 1, in which said LPLDPE is a copolymer of ethylene and butene-1.
Claim 18
Dependent Claim
24 words
A cling wrap plastic film according to claim 1, in which said LPLDPE is a terpolymer comprising ethylene, hexene-1, and either propylene or butene-1.
Claim 19
Dependent Claim
22 words
A cling wrap plastic film according to claim 1, in which the film thickness is between about 0.4 and about 0.6 mils.
Claim 20
Dependent Claim
33 words
A cling wrap plastic film according to claim 1, in which the density of said HPLDPE and the density of said LPLDPE are both between about 0.910 and about 0.932 gms/cm 3 .
Claim 21
Dependent Claim
26 words
A cling wrap plastic film according to claim 1, in which the density of said LPLDPE is between about 0.917 and about 0.920 gms/cm 3 .
Claim 22
Dependent Claim
26 words
A cling wrap plastic film according to claim 1, in which the density of said HPLDPE is between about 0.926 and about 0.929 gms/cm 3 .
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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) | 1986-01-03 | 1986-07-05 | 1987-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-03 | 1990-07-05 | 1991-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-03 | 1994-07-05 | 1995-01-04 | $7700.00 | Window Closed / Lapsed |