US4957790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oriented polymeric films
Assignee: Cryovac LLC
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Filing: 1987-12-21
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Granted: 1990-09-18
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Expires: 2007-12-21
Abstract
Abstract Described is the presence of both a pro-rad linking agent and irradiation such as electron beam irradiation, in the manufacturing process for making an oriented, i.e. heat-shrinkable, polymeric film. The presence of both results in an amount of cross-linking that is effective to accomplish an increased orientation rate during manufacturing.
Inventors
- 👤 Thomas C. Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:29
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/16; B29; B29C; B29C61/00; B29C61/003; B32B27/06; B32B27/08; B32B27/18; B32B27/30; B32B27/304; B32B27/306; B32B27/32; C; C08; C08J; C08J5/00; C08J5/18; C08J7/00; C08J7/12; C08J7/16; C08J7/18; B29C71/00; B29C71/04; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2439/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1352; Y10T428/1379; Y10T428/31504; Y10T428/31855; Y10T428/31909
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
44 words
A multilayer heat-shrinkable (oriented) film comprising at least one layer of cross-linkable polymer, said layer (1) (originally) containing a pro-rad agent and (2) being irradiated, both being to an extent sufficient to provide an amount of cross-linking effective to accomplish an increased orientation rate.
Claim 2
Dependent Claim
44 words
A multilayer heat-shrinkable (oriented) film comprising at least one layer of cross-linkable polymer, said layer (1) (originally) containing a pro-rad agent and (2) being irradiated, both being to an extent sufficient to provide an amount of cross-linking effective to accomplish an increased orientation rate.
Claim 3
Dependent Claim
23 words
The film of claim 1 wherein said pro-rad agent is (originally) present in an amount from about 0.001 to about 5.0% by weight.
Claim 4
Dependent Claim
15 words
The film of claim 1 wherein said pro-rad agent is a compound having poly-functional moities.
Claim 5
Dependent Claim
27 words
The film of claim 3 wherein said pro-rad is triallyl cyanurate, triallyl isocyanurate, glutaraldehyde, ethylene glycol dimethacrylate, diallyl maleate, dipropargyl maleate, dipropargyl monoallyl cyanurate, or pentaerythritol tetramethacrylate.
Claim 6
Dependent Claim
20 words
The film of claim 1 wherein the irradiation is in a dosage from about 0.5 MR to about 20 MR.
Claim 7
Dependent Claim
12 words
The film of claim 1 wherein the cross-linkable polymer is a polyolefin.
Claim 8
Dependent Claim
22 words
The film of claim 6 wherein the polyolefin is HDPE, LDPE, MDPE, LLDPE, VLDPE, EVA, EAA, EMA, EBA, EEA, or mixtures thereof.
Claim 9
Dependent Claim
10 words
The film of claim 1 further including a barrier layer.
Claim 10
Dependent Claim
20 words
A bag formed from the film of claim 1, said bag having end seal(s), side seal(s), or a combination thereof.
Claim 11
Dependent Claim
23 words
The bag of claim 9 wherein said pro-rad agent is originally present in an amount from about 0.001 to about 5.0% by weight.
Claim 12
Dependent Claim
15 words
The bag of claim 9 wherein said pro-rad agent is a compound having poly-functional moieties.
Claim 13
Dependent Claim
27 words
The bag of claim 11 wherein said pro-rad is triallyl cyanurate, triallyl isocyanurate, glutaraldehyde, ethylene glycol dimethacrylate, diallyl maleate, dipropargyl maleate, dipropargyl monoallyl cyanurate, or pentaerythritol tetramethacrylate.
Claim 14
Dependent Claim
20 words
The bag of claim 9 wherein the irradiation is in a dosage from about 0.5 MR to about 20 MR.
Claim 15
Dependent Claim
9 words
The bag of claim 9 including a barrier layer.
Claim 16
Dependent Claim
46 words
A multilayer heat-shrinkable (oriented) film comprising at least one layer of cross-linkable polymer, said layer (1) originally containing from about 0.001 to about 5.0% by weight of pro-rad agent and (2) being subjected to irradiative cross-linking at a dosage from about 0.5 to about 20 MR.
Claim 17
Dependent Claim
46 words
A multilayer heat-shrinkable (oriented) film comprising at least one layer of cross-linkable polymer, said layer (1) originally containing from about 0.001 to about 5.0% by weight of pro-rad agent and (2) being subjected to irradiative cross-linking at a dosage from about 0.5 to about 20 MR.
Claim 18
Dependent Claim
9 words
The film of claim 15 including a barrier layer.
Claim 19
Dependent Claim
20 words
The film of claim 1 wherein the irradiation is in a dosage from about 1 MR to about 8 MR.
Claim 20
Dependent Claim
20 words
The process of claim 9 wherein the irradiation is in a dosage from about 1 MR to about 8 MR.
Claim 21
Dependent Claim
20 words
The bag of claim 9 wherein the irradiation is in a dosage from about 1 MR to about 8 MR.
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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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |