Patent US4870122A successfully refreshed from Google Patents.
US4870122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
HdPE films with imbalanced biaxial orientation
Assignee: Mobil Oil AS
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Filing: 1987-09-28
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Granted: 1989-09-26
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Expires: 2007-09-28
Abstract
Abstract High density polyethylene (HDPE) films, preferably containing blends of HDPE resins or microcrystalline wax, are oriented up to about two times in the machine direction and six times or more in the transverse direction to give films having good dead-fold and water vapor transmission characteristics making them highly suited for packaging, particularly for dry foods when coated with or coextruded with a heat sealable layer, e.g. Surlyn.
Inventors
- 👤 Pang-Chia Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:33
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B29; B29C; B29C55/00; B29C55/02; B29C55/023; B29C55/026; B29C55/10; B29C55/12; B29C55/14; B29C55/143; B32B27/06; B32B27/08; B32B27/30; B32B27/306; C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2995/00; B29K2995/0037; B29K2995/0065; B32B2270/00; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/04; B32B2323/043; B32B2439/00; B32B2439/70; C08J2323/00; C08J2323/02; C08J2323/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
A biaxially oriented high density polyethylene film comprising at least 50 weight percent of a high density polyethylene (HDPE) having a density of 0.96 or higher which is oriented in the solid state to a degree of from about 1.25:1 to about 2:1 in the machine direction, and to a degree of from about 6:1 to about 12:1 in the transverse direction.
Claim 2
Dependent Claim
62 words
A biaxially oriented high density polyethylene film comprising at least 50 weight percent of a high density polyethylene (HDPE) having a density of 0.96 or higher which is oriented in the solid state to a degree of from about 1.25:1 to about 2:1 in the machine direction, and to a degree of from about 6:1 to about 12:1 in the transverse direction.
Claim 3
Dependent Claim
26 words
The film of claim 1 in which the degree of transverse direction orientation is at least 4 times greater than the degree of machine direction orientation.
Claim 4
Dependent Claim
49 words
The film of claim 1 comprising a major proportion of a first HDPE having a density of 0.96 or higher and a melt index from about 0.6 to 1.2 and a second HDPE having a density of 0.96 or higher and a different melt index than said first HDPE.
Claim 5
Dependent Claim
84 words
The film of claim 1 comprising 50 to 98 weight percent of a first HDPE having a density of 0.96 or higher and a melt index of greater than 0.5 to 2.0; 1 to 25 weight of a second HDPE having a density of 0.96 or higher and a melt index of 0.1 to about 0.5; and 1 to 25 weight percent of a third HDPE having a density of 0.96 or higher and a melt index of greater than 2.0 to about 8.
Claim 6
Dependent Claim
34 words
The film of claim 4 in which said first HDPE comprises at least about 84 weight percent and said second and third HDPE resins each comprises 3 to 8 weight percent of said film.
Claim 7
Dependent Claim
15 words
The film of claim 1 containing up to about 10 weight percent of microcrystalline wax.
References Cited (Backward Citations)
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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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |