US4288477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Readily thermoweldable films of polyolefins coated with lacquers based on ketonic resins
Assignee: Moplefan SpA
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Filing: 1978-10-23
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Granted: 1981-09-08
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Expires: 1998-10-23
Abstract
Abstract Films consisting essentially of alpha-olefin polymers, such as normally solid polypropylene consisting essentially of recurring propylene units and having a substantial crystalline polypropylene content, and in particular isotactic polypropylene, are coated with a ketonic resin resulting from the polycondensation of aldehydes with ketones, which coating renders the films readily thermoweldable and/or impervious to gases, vapors and the like. The coated films are useful for the manufacture of containers, covers, small bags, vessels and in general for the manufacture of articles useful in the packaging industry.
Inventors
- 👤 Fosco Bordini
- 👤 Luigi Mauri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:53
CPC Classifications
C; C08; C08G; C08G6/00; C08G6/02; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C08J7/048; C08J7/052; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/10; C09D161/00; C09D161/02; C08J2323/00; C08J2323/02; C08J2461/00; C08J2461/02; C08L; C08L61/00; C08L61/02; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/31504; Y10T428/31855; Y10T428/31859; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928; Y10T428/31942
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
64 words
Bags and packaging articles formed of a heat-sealed film of normally solid polypropylene consisting essentially of recurring propylene units, having a substantial crystalline polypropylene content, said film being coated on at least one of its surfaces with a ketonic resin or with a mixture of a ketonic resin and at least one polymer selected from the group consisting of vinyl, acrylic and cellulose polymers.
Claim 2
Dependent Claim
64 words
Bags and packaging articles formed of a heat-sealed film of normally solid polypropylene consisting essentially of recurring propylene units, having a substantial crystalline polypropylene content, said film being coated on at least one of its surfaces with a ketonic resin or with a mixture of a ketonic resin and at least one polymer selected from the group consisting of vinyl, acrylic and cellulose polymers.
Claim 3
Dependent Claim
73 words
A process for making bags and packaging articles which comprises applying directly to at least one surface of a polyolefin film or to at least one surface of a polyolefin film pretreated with a primar, a coating consisting of (A) a ketonic resin, or (B) a mixture of a ketonic resin with at least one polymer selected from the group consisting of vinyl, acrylic and cellulose polymers, and thereafter heat-sealing the coated film.
Claim 4
Dependent Claim
73 words
A process for making bags and packaging articles which comprises applying directly to at least one surface of a polyolefin film or to at least one surface of a polyolefin film pretreated with a primar, a coating consisting of (A) a ketonic resin, or (B) a mixture of a ketonic resin with at least one polymer selected from the group consisting of vinyl, acrylic and cellulose polymers, and thereafter heat-sealing the coated film.
Claim 5
Dependent Claim
18 words
The process of claim 2, in which the polyolefin film coated is stretched in one or both directions.
Claim 6
Dependent Claim
25 words
The process of claim 2, in which the polyolefin film which is coated is a film of polypropylene consisting prevailingly of macromolecules having isotactic structure.
Claim 7
Dependent Claim
36 words
The process of claim 2, in which the polyolefin film which is coated is a film consisting of isotactic polypropylene made up of isotactic macromolecules having substantially the isotactic structure and being insoluble in boiling n-heptane.
Claim 8
Dependent Claim
18 words
The process of claim 2, in which the ketonic resin is a polycondensate of aldehydes with cyclic kentones.
Claim 9
Dependent Claim
24 words
The process of claim 2, in which the coating is a mixture (B) containing from 20% to 80% by weight of the ketonic resin.
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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |