US4197150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coextruded heat sealable laminar thermoplastic films
Assignee: Mobil Oil AS
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Filing: 1978-10-26
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Granted: 1980-04-08
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Expires: 1998-10-26
Abstract
Abstract Laminar thermoplastic films are provided which exhibit improved heat seal strengths as well as heat seal temperature ranges. The laminates comprise a predominantly propylene-based polymer substrate or core, the propylene core layer being coated with continuous skins, the skins being fabricated from ethylene based resin with a density of less than 0.939.
Inventors
- 👤 Peter Breidt, Jr.
- 👤 Thomas W. Higgins
- 👤 A. Michael Nahmias
- 👤 Milton L. Weiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:35
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A method for the production of oriented laminar thermoplastic heat sealable film which comprises the coextrusion of a multilayer laminate base film, said base film comprising a relatively thick core and at least one relatively thin coating layer on a surface of said core, said core layer having a higher melting temperature than said coating layer; quenching said base film; preheating said base film; and stretching said base film in the machine direction utilizing a series of draw rollers and a stretching temperature within the range of about 200° F. up to about 240° F., said core comprising a member selected from the group consisting of (1) ethylene/propylene copolymers; (2) blends of ethylene/propylene copolymer with an aliphatic diene copolymer; and (3) blends of polypropylene with an alipathic diene copolymer.
Claim 2
Independent Claim
129 words
A method for the production of oriented laminar thermoplastic heat sealable film which comprises the coextrusion of a multilayer laminate base film, said base film comprising a relatively thick core and at least one relatively thin coating layer on a surface of said core, said core layer having a higher melting temperature than said coating layer; quenching said base film; preheating said base film; and stretching said base film in the machine direction utilizing a series of draw rollers and a stretching temperature within the range of about 200° F. up to about 240° F., said core comprising a member selected from the group consisting of (1) ethylene/propylene copolymers; (2) blends of ethylene/propylene copolymer with an aliphatic diene copolymer; and (3) blends of polypropylene with an alipathic diene copolymer.
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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) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |