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US4495027A
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US
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Method of making an oriented multilayer heat sealable packaging film
Assignee: Mobil Oil AS
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Filing: 1984-02-03
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Granted: 1985-01-22
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Expires: 2004-02-03
Abstract
Abstract An oriented multilayer heat sealable film structure comprising a polyolefin film substrate, a layer of a random copolymer of ethylene and propylene, a primer layer on said copolymer layer and a layer of heat sealable vinylidene chloride polymer on said primer layer. The method of preparing said structure includes aging said structure at a temperature and for a time resulting in increased heat seal strength.
Inventors
- 👤 John R. Wagner, Jr.
- 👤 Carl C. Hein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:57
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/043; C08J7/052; C08J2323/00; C08J2323/02; C08J2427/00; C08J2427/02; C08J2427/04; C08J2427/08; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
The method for producing a heat sealable multiply film structure comprising: coextruding a substrate layer comprising homopolymer polypropylene with a layer consisting essentially of a random copolymer of ethylene and propylene on at least one side of said polypropylene layer, said copolymer containing from about 0.5 to about 6% by weight of ethylene and about 94 to about 99.5% by weight of propylene: biaxially orienting the coextrudate; applying a primer coating to the surface of at least one random copolymer layer; applying a heat sealable layer on said primer coating, said heat sealable layer comprising a vinylidene chloride copolymer containing at least 50% by weight of vinylidene chloride; and aging the structure for a time and at a temperature sufficient to yield a heat seal strength between facing heat sealed layers greater than that obtained in the absence of said aging.
Claim 2
Independent Claim
141 words
The method for producing a heat sealable multiply film structure comprising: coextruding a substrate layer comprising homopolymer polypropylene with a layer consisting essentially of a random copolymer of ethylene and propylene on at least one side of said polypropylene layer, said copolymer containing from about 0.5 to about 6% by weight of ethylene and about 94 to about 99.5% by weight of propylene: biaxially orienting the coextrudate; applying a primer coating to the surface of at least one random copolymer layer; applying a heat sealable layer on said primer coating, said heat sealable layer comprising a vinylidene chloride copolymer containing at least 50% by weight of vinylidene chloride; and aging the structure for a time and at a temperature sufficient to yield a heat seal strength between facing heat sealed layers greater than that obtained in the absence of said aging.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein said aging is for a period of time of from about 24 hours to about 21 days at a temperature of about 32° F. to about 150° F.
Claim 4
Independent Claim
147 words
The method for producing a heat sealable multiply film structure comprising: machine direction orienting a substrate layer comprising homopolymer polypropylene; applying to at least one side of said polypropylene layer a layer consisting essentially of a random copolymer of ethylene and propylene containing from about 0.5 to about 6% by weight of ethylene and about 94 to about 99.5% by weight of propylene; transverse direction orienting the polypropylene layer having the applied copolymer layer; applying a primer coating to the surface of at least one random copolymer layer; applying a heat sealable layer on said primer coating; said heat sealable layer comprising a vinylidene chloride copolymer containing at least 50% by weight of chloride; and aging the structure for a time and at a temperature sufficient to yield a heat seal strength between facing heat sealed layers greater than that obtained in the absence of said aging.
Claim 5
Independent Claim
147 words
The method for producing a heat sealable multiply film structure comprising: machine direction orienting a substrate layer comprising homopolymer polypropylene; applying to at least one side of said polypropylene layer a layer consisting essentially of a random copolymer of ethylene and propylene containing from about 0.5 to about 6% by weight of ethylene and about 94 to about 99.5% by weight of propylene; transverse direction orienting the polypropylene layer having the applied copolymer layer; applying a primer coating to the surface of at least one random copolymer layer; applying a heat sealable layer on said primer coating; said heat sealable layer comprising a vinylidene chloride copolymer containing at least 50% by weight of chloride; and aging the structure for a time and at a temperature sufficient to yield a heat seal strength between facing heat sealed layers greater than that obtained in the absence of said aging.
Claim 6
Dependent Claim
34 words
The method of claim 3 wherein said aging is for a period of time of from about 24 hours to about 21 days at a temperature of about 32° F. to about 150° F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |