US4975315A
Expired / Lapsed
US
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Metallizable multi-ply film
Assignee: Hoechst AG
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Filing: 1988-03-15
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Granted: 1990-12-04
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Expires: 2008-03-15
Abstract
Abstract A metallizable, sealable, biaxially stretch-oriented multi-ply film comprises a base layer essentially of polypropylene, a first polyolefinic facing layer and a second polyolefinic facing layer. All of the layers contain a neutralizing agent and a stabilizer against thermal degradation. The neutralizing agent is a calcium carbonate having an absolute particle size of less than 10.0 μm, a mean particle size of less than 0.1 μm, a specific surface area of more than 40 m 2 /g and a whiteness of more than 90% and, the stabilizer comprises a phenolic stabilizer having a molecular weight of more than 1,000 g/mol. One polyolefinic facing layer contains an anti-blocking agent. In addition, a process for producing the metallizable multi-ply film is described, and its use as a packaging material is indicated.
Inventors
- 👤 Lothar Bothe
- 👤 Gunter Schloegl
- 👤 Guenther Crass
- 👤 Thomas Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:04
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B27/20; B32B27/06; B32B27/08; B32B15/00; B32B15/04; B32B15/08; B32B15/085; B32B15/20; B32B27/16; B32B27/32; B32B38/00; B32B38/0008; B32B7/00; B32B7/04; B32B7/12; B32B38/0012; B32B2038/0028; B32B2255/00; B32B2255/20; B32B2255/205; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/518; B32B2309/00; B32B2309/02; B32B2310/00; B32B2310/14; B32B2311/00; B32B2311/24; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/25; Y10T428/31504; Y10T428/31507; Y10T428/31678; Y10T428/31692; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
144 words
A metallizable, sealable, biaxially stretch-oriented multi-ply film, consisting essentially of a base layer comprised predominantly of propylene; a first polyolefinic facing layer on a first side of said base layer; a second polyolefinic facing layer on a second side of said base layer; each of said layers containing a neutralizing agent, comprising a calcium carbonate having an absolute particle size of less than about 10 μm, a mean particle size of less than about 0.1 μm, a specific surface area of more than about 40 m 2 /g and a whiteness of more than about 90%, in a quantity of from about 0.01% to 0.2% by weight, relative to the weight of the layer, and a stabilizer against thermal degradation comprising a phenolic stabilizer having a molecular weight of more than about 1000 g/mol; and wherein one polyolefinic facing layer contains an anti-blocking agent.
Claim 2
Dependent Claim
144 words
A metallizable, sealable, biaxially stretch-oriented multi-ply film, consisting essentially of a base layer comprised predominantly of propylene; a first polyolefinic facing layer on a first side of said base layer; a second polyolefinic facing layer on a second side of said base layer; each of said layers containing a neutralizing agent, comprising a calcium carbonate having an absolute particle size of less than about 10 μm, a mean particle size of less than about 0.1 μm, a specific surface area of more than about 40 m 2 /g and a whiteness of more than about 90%, in a quantity of from about 0.01% to 0.2% by weight, relative to the weight of the layer, and a stabilizer against thermal degradation comprising a phenolic stabilizer having a molecular weight of more than about 1000 g/mol; and wherein one polyolefinic facing layer contains an anti-blocking agent.
Claim 3
Dependent Claim
16 words
A film as claimed in claim 1, wherein at least one polyolefinic facing layer is heat-sealable.
Claim 4
Dependent Claim
16 words
A film as claimed in claim 2, wherein the heat-sealable facing layer contains an anti-blocking agent.
Claim 5
Dependent Claim
14 words
A film as claimed in claim 1, wherein one polyolefinic facing layer is non-heat-sealable.
Claim 6
Dependent Claim
15 words
A film as claimed in claim 4, wherein the non-sealable facing layer has been corona-treated.
Claim 7
Dependent Claim
17 words
A film as claimed in claim 4, wherein the non-sealable facing layer contains a saturated hydrocarbon resin.
Claim 8
Dependent Claim
37 words
A film as claimed in claim 6, wherein the hydrocarbon resin comprises a hydrogenated cyclopentadiene resin which is present in a quantity from about 2% to 12% by weight, relative to the weight of the facing layer.
Claim 9
Dependent Claim
32 words
A film as claimed in claim 2, wherein the sealable layer contains the anti-blocking agent in a quantity from about 0.1% to 0.7% by weight, relative to the weight of this layer.
Claim 10
Dependent Claim
16 words
A film as claimed in claim 8, wherein the anti-blocking agent contains silica or aluminum silicate.
Claim 11
Dependent Claim
30 words
A film as claimed in claim 1, which has an overall thickness from about 10 to 40 μm, the facing layers each being from about 0.2 to 0.7 μm thick.
Claim 12
Dependent Claim
24 words
A film as claimed in claim 5, further comprising a metal layer metallized or laminated to the outside of the non-sealable, surface-treated facing layer.
Claim 13
Dependent Claim
17 words
A film as claimed in claim 11, wherein the metal layer comprises aluminum applied by vacuum vapor-deposition.
Claim 14
Dependent Claim
15 words
A film as claimed in claim 11, wherein the metal layer comprises an aluminum foil.
Claim 15
Dependent Claim
25 words
A film as claimed in claim 11, wherein the metal layer is bonded to the non-sealable, surface-treated layer by means of a solvent-free, two-component adhesive.
Claim 16
Dependent Claim
22 words
A film comprising a film as claimed in claim 11, further comprising a protective coating on the outside of the metal layer.
Claim 17
Dependent Claim
16 words
A film as claimed in claim 15, wherein the protective coating comprises a polyolefinic protective coating.
Claim 18
Dependent Claim
23 words
A film as claimed in claim 16, wherein the protective coating comprises a polyethylene film or a polypropylene film or a polyester film.
Claim 19
Dependent Claim
31 words
A film as claimed in claim 15, which is doubled on itself via its sealable facing layer or is bonded via this facing layer to a single-ply or two-ply polypropylene film.
Claim 20
Dependent Claim
20 words
A packaging film, especially in a film composite or paper composite, comprising a multi-ply film as defined by claim 1.
References Cited (Backward Citations)
US3343663A
Cited
US3914521A
Cited
US4303708A
Cited
US4424256A
Cited
US4666772A
Cited
US4604322A
Cited
EP0216343A2
Cited
US4692837A
Cited
EP0263963A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |