US5026610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric films
Assignee: Akzo Nobel Films Holding Ltd
•
Filing: 1988-10-04
•
Granted: 1991-06-25
•
Expires: 2008-10-04
Abstract
Abstract The invention concerns polymeric films which can be used for twist wrap, for example for confectionery. Films of the invention have a layer of a blend of high density polyethylene with a polyethylene of lower density, a layer of high density polyethylene being provided on each surface of the blend. In general films of the invention will be produced by coextrusion and then uniaxially stretched in the machine direction. It has been possible to cut such films satisfactorily in a direction transverse to the direction of stretch using an oscillating cutter blade of the type used to cut films of reconstituted cellulose.
Inventors
- 👤 John Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:43
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B38/00; B32B38/0012; B32B2038/0028; B32B2250/00; B32B2250/24; B32B2270/00; B32B2323/00; B32B2323/04; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
A twist warp polymeric film comprising a layer of a blend of high density polyethylene with a polyethylene of lower density than high density polyethylene, and a layer of high density polyethylene on each surface of the layer of the blend, wherein the weight ratio of high density polyethylene to polyethylene of lower density than high density polyethylene in said blend is from 20:80 to 80:20.
Claim 2
Dependent Claim
66 words
A twist warp polymeric film comprising a layer of a blend of high density polyethylene with a polyethylene of lower density than high density polyethylene, and a layer of high density polyethylene on each surface of the layer of the blend, wherein the weight ratio of high density polyethylene to polyethylene of lower density than high density polyethylene in said blend is from 20:80 to 80:20.
Claim 3
Dependent Claim
36 words
A film according to claim 1, wherein the polyethylene of lower density than high density polyethylene is a member selected from the group consisting of a lower density polyethylene, a medium density polyethylene and mixtures thereof.
Claim 4
Dependent Claim
15 words
A film according to claim 1, wherein the weight ratio is from 40:60 to 60:40.
Claim 5
Dependent Claim
13 words
A film according to claim 3, wherein the weight ratio is about 50:50.
Claim 6
Dependent Claim
22 words
A film according to claim 1, wherein the high density polyethylene has a density of from 0.94 to 0.97 g/cm 3 .
Claim 7
Dependent Claim
35 words
A film according to claim 1, wherein the high density polyethylene has a melt flow index of not greater than 4 under ASTM 1238/73 at 190° C. and a pressure of 2.16 Kg/cm 2 .
Claim 8
Dependent Claim
27 words
A film according to claim 1, wherein the polyethylene of lower density than high density polyethylene has a density of from 0.90 to 0.935 g/cm 3 .
Claim 9
Dependent Claim
18 words
A film according to claim 7, wherein the said density is from 0.915 to 0.925 g/cm 3 .
Claim 10
Dependent Claim
16 words
A film according to claim 1, wherein the respective layers are of substantially the same thickness.
References Cited (Backward Citations)
DE2029127A1
Cited
GB1316640A
Cited
FR2154624A1
Cited
GB1368634A
Cited
US3936565A
Cited
US4151318A
Cited
US4199638A
Cited
US4303710A
Cited
US4346834A
Cited
EP0095299A2
Cited
JPS6431251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-24 | 1994-12-24 | 1995-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-24 | 1998-12-24 | 1999-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-24 | 2002-12-24 | 2003-06-25 | $7700.00 | Window Closed / Lapsed |