US4719147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupled packaging sheets impermeable to gases and vapors and based on polyolefinic films
Assignee: Moplefan SpA
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Filing: 1986-08-19
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Granted: 1988-01-12
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Expires: 2006-08-19
Abstract
Abstract There are disclosed coupled packaging sheets which are impermeable to gases and vapors and consist of two polyolefinic films coupled together, at least one being an oriented polypropylene film and at least one of the two films being coated with a lacquer which acts as a barrier to gases and vapors, and which is metallized on the face in contact with the other film. The present invention provides coupled sheets or films based on films of olefinic polymers, showing improved characteristics of impermeability to gases and vapors and which are particularly suited for the manufacture of containers, envelopes, bags, vessels and, in general, manufactured articles intended prevailingly for the packaging industry.
Inventors
- 👤 Luigi Mauri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:27
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B37/00; B32B37/14; B32B37/15; B32B37/153; B32B7/00; B32B7/04; B32B7/12; B32B37/12; B32B37/1207; B32B2037/1215; B32B38/00; B32B38/0012; B32B2038/0028; B32B2255/00; B32B2255/26; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2323/00; B32B2323/10; B32B2439/00; B32B2439/70; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
106 words
Coupled packaging films which are impermeable to gases and vapors and consist of two olefinic polymer films, at least one of which is an oriented film, coupled to each other, with or without the interposition of an adhesive, at least one of said films being coated with a lacquer acting as a barrier for gases and vapors and metallized on the face thereof in contact with the other of said films, the lacquer being selected from the group consisting of vinylidene copolymers having a content in vinylidene units greater than 75% by weight and polymeric mixtures containing polyvinyl alcohol of medium to high degree of hydrolysis.
Claim 2
Dependent Claim
106 words
Coupled packaging films which are impermeable to gases and vapors and consist of two olefinic polymer films, at least one of which is an oriented film, coupled to each other, with or without the interposition of an adhesive, at least one of said films being coated with a lacquer acting as a barrier for gases and vapors and metallized on the face thereof in contact with the other of said films, the lacquer being selected from the group consisting of vinylidene copolymers having a content in vinylidene units greater than 75% by weight and polymeric mixtures containing polyvinyl alcohol of medium to high degree of hydrolysis.
Claim 3
Dependent Claim
35 words
Coupled films according to claim 1, characterized in that the oriented film is obtained by extrusion and stretching of polypropylene consisting prevailingly of isotactic macro-molecules and having a melt index comprised between 0.5 and 5.
Claim 4
Dependent Claim
72 words
Coupled films according to claim 1, characterized in that they consist of two olefinic polymer films coupled to each other, one of said films being an oriented film of polypropylene and the other film being a non-oriented film obtained by the extrusion of polypropylene, polyethylene, crystalline propylene-ethylene copolymers with a prevailing content in propylene, mixtures of polyethylene and polypropylene with each other or mixtures of said homopolymers with other polymers or copolymers.
Claim 5
Dependent Claim
29 words
Coupled fixtures according to claim 3, characterized in that a non-oriented film is used and obtained by extrusion of a crystalline random propylene-ethylene copolymer with a prevailing propylene content.
Claim 6
Dependent Claim
29 words
Coupled films according to claim 1, characterized in that a non-oriented film is used and obtained by extrusion of a crystalline block propylene-ethylene copolymer with a prevailing propylene content.
Claim 7
Dependent Claim
44 words
Coupled films according to claim 3, characterized in that a non-oriented film is used and obtained by extrusion of a mixture selected from the group consisting of mixtures of polypropylene or polyethylene with ethylene-propylene copolymers and mixtures of said homopolymers with ethylene-vinyl acetate copolymers.
Claim 8
Dependent Claim
33 words
Coupled films according to claim 1, characterized in that the lacquer acting as barrier to gases and vapors consists of vinylidene copolymers having a content in vinylidene units greater than 75% by weight.
Claim 9
Dependent Claim
25 words
Coupled films according to claim 7, characterized in that the vinylidene copolymer is selected from the group consisting of vinylidene chloride/acrylonitrile copolymers and vinylidene/methylmethacrylate copolymers.
Claim 10
Dependent Claim
32 words
Coupled films according to claim 1, characterized in that the lacquer acting as barrier to gases and vapors consists of a polymeric mixture containing polyvinyl-alcohol of medium or high degree of hydrolysis.
Claim 11
Dependent Claim
27 words
Coupled films according to claim 9, characterized in that the lacquer acting as barrier to gases and vapors is a polymeric mixture comprising polyvinyl-alcohol and a polyalkyleneimine.
Claim 12
Dependent Claim
16 words
Coupled films according to claim 10, in which the polyalkyleneimine of the polymeric mixture is polyethyleneimine.
Claim 13
Dependent Claim
16 words
Coupled films according to claim 10, in which the polyalkyleneimine of the polymeric mixture is polypropyleneimine.
Claim 14
Dependent Claim
37 words
Coupled films according to claim 1, characterized in that the lacquer is applied on the oriented film after pretreatment of said film by continuous, non-perforating electrical discharges, by an oxidizing flame or by a chemical oxidizing system.
Claim 15
Dependent Claim
22 words
Coupled films according to claim 1, characterized in that the thickness of the lacquer coating is comprised between 1 and 20 micron.
Claim 16
Dependent Claim
33 words
Coupled films according to claim 1, characterized in that the metallization is carried out with aluminum, under vacuum and for a thickness corresponding to a superficial resistivity comprised between 1 and 5 Ohm.
Claim 17
Dependent Claim
16 words
Coupled films according to claim 1, characterized in that the metallized film is printed with inks.
Claim 18
Dependent Claim
33 words
Coupled films according to claim 1, characterized in that the two films are coupled together by means of an adhesive selected from the group of synthetic adhesive consisting of thermoplastic resins and hot-melts.
Claim 19
Dependent Claim
20 words
Coupled films according to claim 1, characterized in that the two films are coupled together by means of extrusion coating.
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) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |