US4671986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite packing film
Assignee: Moplefan SpA
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Filing: 1984-09-18
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Granted: 1987-06-09
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Expires: 2004-09-18
Abstract
Abstract Composite film for packing comprising an inner supporting layer of a polyolefinic film coated, on one or both faces hereof, with a polyolefin containing free carboxylic acid along the polymeric chain and with a vinyl polymer or with a polyamide.
Inventors
- 👤 Luciano Clementini
- 👤 Pierpaolo Camprincoli
- 👤 Enzo Marcaccioli
- 👤 Alfredo Gemmi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:07
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/516; B32B2307/518; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
62 words
A composite packing film consisting of an inner supporting layer of a polyolefinic film coated, on at least one face thereof, with a layer of an olefinic (co)polymer grafted with an unsaturated acid and containing free carboxylic groups along the polymeric chain and with an external coating of a polymer selected from the group consisting of a vinyl polymer and a polyamide.
Claim 2
Dependent Claim
62 words
A composite packing film consisting of an inner supporting layer of a polyolefinic film coated, on at least one face thereof, with a layer of an olefinic (co)polymer grafted with an unsaturated acid and containing free carboxylic groups along the polymeric chain and with an external coating of a polymer selected from the group consisting of a vinyl polymer and a polyamide.
Claim 3
Dependent Claim
18 words
A composite film as claimed in claim 1, in which the inner supporting film is a bi-stretched film.
Claim 4
Dependent Claim
18 words
A composite film as claimed in claim 1, in which the inner supporting film is a mono-stretched film.
Claim 5
Dependent Claim
18 words
A composite film as claimed in claim 1, in which the inner supporting film is a non-stretched film.
Claim 6
Dependent Claim
29 words
A composite film as claimed in claim 1, in which the polyolefinic film is made of polypropylene consisting essentially of isotactic macromolecules and obtained by stereospecific polymerization of propylene.
Claim 7
Dependent Claim
17 words
A composite film as claimed in claim 5, in which polypropylene is employed in admixture with polyethylene.
Claim 8
Dependent Claim
33 words
A composite film as claimed in claim 5, in which polypropylene is employed in admixture with a crystalline propylene/ethylene copolymer having a predominant propylene content, of both the random and the block type.
Claim 9
Dependent Claim
29 words
A composite film as claimed in claim 1, in which the unsaturated acid is selected from acrylic acid, methacrylic acid, maleic acid, fumaric acid, crotonic acid and itaconic acid.
Claim 10
Dependent Claim
32 words
A composite film as claimed in claim 1, in which the thickness of the coating with the olefinic (co)polymer containing free carboxylic groups along the chain is from 10 to 100 microns.
Claim 11
Dependent Claim
32 words
A composite film as claimed in claim 1, in which the vinyl polymer is selected from polyethylene, crystalline propylene/ethylene copolymers having a predominant propylene content, ethylene/unsaturated ester copolymers, and ethylene/unsaturated alcohol copolymers.
Claim 12
Dependent Claim
18 words
A composite film as claimed in claim 11, in which the ethylene/unsaturated ester copolymers are ethylene/vinyl acetate copolymers.
Claim 13
Dependent Claim
18 words
A composite film as claimed in claim 11, in which the ethylene/unsaturated alcohol copolymers are ethylene/vinyl alcohol copolymers.
Claim 14
Dependent Claim
24 words
A composite film as claimed in claim 1, in which the polyamide is selected from nylon 6,6; nylon 6; nylon 4 and nylon 6,10.
Claim 15
Dependent Claim
25 words
A composite film as claimed in claim 1, in which the thickness of the coating with a vinyl polymer is from 10 to 100 microns.
Claim 16
Dependent Claim
24 words
A composite film as claimed in claim 1, in which the thickness of the coating with a polyamide is from 10 to 100 microns.
Claim 17
Dependent Claim
51 words
A composite film as claimed in claim 1, in which both faces of the inner supporting layer of a polyolefinic film are coated with an olefinic (co)polymer containing free carboxylic groups along the polymeric chain and with a polymer selected from the group consisting of a vinyl polymer and a polyamide.
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) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |