US5158836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oriented film of high clarity and gloss
Assignee: Cryovac LLC
•
Filing: 1991-02-21
•
Granted: 1992-10-27
•
Expires: 2011-02-21
Abstract
Abstract Polymeric, oriented films can be made by the use of a combination of a hot blown process and a blown bubble process. Styrene butadiene copolymer (SBC) forms two outer layers of the preferred embodiment, with a core layer of very low density polyethylene (VLDPE) or blends thereof, and intermediate polymeric adhesive layers such as ethylene vinyl acetate copolymer (EVA) bonding the core layer to the outer layers. A monoaxially or biaxially oriented film is produced with excellent optics.
Inventors
- 👤 Henry G. Schirmer
- 👤 Stephen F. Compton
- 👤 Martin Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:16
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/31928
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
46 words
A biaxially oriented multilayer film comprising: (a) a core layer comprising a very low density polyethylene; (b) two outer layers each comprising a styrene butadiene copolymer; and (c) two intermediate layers each bonding the core layer to a respective outer layer, and comprising a polymeric adhesive.
Claim 2
Dependent Claim
46 words
A biaxially oriented multilayer film comprising: (a) a core layer comprising a very low density polyethylene; (b) two outer layers each comprising a styrene butadiene copolymer; and (c) two intermediate layers each bonding the core layer to a respective outer layer, and comprising a polymeric adhesive.
Claim 3
Dependent Claim
26 words
The film of claim 1 wherein the two outer layers each include between about 0.1% and 6% by weight of each outer layer, of a plasticizer.
Claim 4
Dependent Claim
20 words
The film of claim 1 wherein the two outer layers each have a thickness of less than about 0.04 mils.
Claim 5
Dependent Claim
21 words
The film of claim 1 wherein the two outer layers each comprise less than about 4% of the total film thickness.
Claim 6
Dependent Claim
29 words
The film of claim 1 wherein the very low density polyethylene has a melt index before blending of no more than about 10 grams/10 minutes (ASTM D1238) (Condition 190/21.601).
Claim 7
Dependent Claim
31 words
The film of claim 1 wherein the very low density polyethylene has a flow rate ratio (I 21 /I 2 .1) before blending of at least about 40 (ASTM D 1238).
Claim 8
Dependent Claim
10 words
The film of claim 1 wherein the film is cross-linked.
Claim 9
Dependent Claim
48 words
A polymeric film oriented in primarily one direction comprises: (a) a core layer comprising a very low density polyethylene; (b) two outer layers each comprising styrene butadiene copolymer; and (c) two intermediate layers each bonding the core layer to a respective outer layer, and comprising a polymeric adhesive.
Claim 10
Dependent Claim
48 words
A polymeric film oriented in primarily one direction comprises: (a) a core layer comprising a very low density polyethylene; (b) two outer layers each comprising styrene butadiene copolymer; and (c) two intermediate layers each bonding the core layer to a respective outer layer, and comprising a polymeric adhesive.
Claim 11
Dependent Claim
29 words
The film of claim 8 wherein the very low density polyethylene has a melt index before blending of no more than about 10 grams/10 minutes (ASTM D1238) (Condition 190/21.601).
Claim 12
Dependent Claim
31 words
The film of claim 8 wherein the very low density polyethylene has a flow rate ratio (I 21 /I 2 .1) before blending of at least about 40 (ASTM D 1238).
Claim 13
Dependent Claim
10 words
The film of claim 8 wherein the film is cross-linked.
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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) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |