Patent US5096630A successfully refreshed from Google Patents.
US5096630A
Expired / Lapsed
US
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Process for the production of a metallizable multiply film
Assignee: Hoechst AG
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Filing: 1990-08-29
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Granted: 1992-03-17
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Expires: 2010-08-29
Abstract
Abstract A process for producing a metallizable, sealable, biaxially stretch-oriented multi-ply film includes the steps of: providing melts of a predominantly polypropylene base layer, and first and second polyolefinic facing layers; co-extruding the melts through a flat film die, wherein the first and second polyolefinic facing layers are co-extruded on either side of the base layer; solidifying the co-extruded film by cooling; longitudinally stretching the co-extruded film at a temperature from about 120° to 130° C. in a ratio of from about 5 to 7:1; transversely stretching the co-extruded film at a temperature from about 160° to 170° C. in a ratio of from about 8 to 10:1; and corona-treating one facing layer of the co-extruded film which is metallizable. Each of the melts contains a calcium carbonate neutralizing agent 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%, and also a phenolic stabilizer against thermal degradation which has a molecular weight of more than about 1,000 g/mol, and wherein one polyolefinic facing layer contains an anti-blocking agent.
Inventors
- 👤 Lothar Bothe
- 👤 Gunter Schloegl
- 👤 Guenther Crass
- 👤 Thomas Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:58
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; 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: 12
Claim 1
Independent Claim
251 words
A process for producing a metallizable, sealable, biaxially stretch-oriented multi-ply film which comprises the steps of (a) providing melts of i) a base layer comprised predominantly of polypropylene, ii) a first polyolefinic facing layer and iii) a second polyolefinic facing layer; employing in each of said melts 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%, and a stabilizer against thermal degradation comprising a phenolic stabilizer having a molecular weight of more than about 1,000 g/mol, wherein one polyolefinic facing layer contains an anti-blocking agent, and wherein one polyolefinic facing layer is metallizable, (b) co-extruding said melts through a flat film die, wherein said first polyolefinic facing layer is co-extruded on a first side of said base layer and said second polyolefinic facing layer is co-extruded on a second side of said base layer; (c) solidifying said co-extruded film by cooling; (d) longitudinally stretching said co-extruded film at a temperature from about 120° to 130° C. in a ratio of from about 5 to 7:1; (e) transversely stretching said co-extruded film at a temperature from about 160° to 170° C. in a ratio of from about 8 to 10:1; and (f) corona-treating said metallizable facing layer of said co-extruded film, (g) whereby the neutralizing agent reduces corrosion of processing equipment during stretching.
Claim 2
Dependent Claim
251 words
A process for producing a metallizable, sealable, biaxially stretch-oriented multi-ply film which comprises the steps of (a) providing melts of i) a base layer comprised predominantly of polypropylene, ii) a first polyolefinic facing layer and iii) a second polyolefinic facing layer; employing in each of said melts 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%, and a stabilizer against thermal degradation comprising a phenolic stabilizer having a molecular weight of more than about 1,000 g/mol, wherein one polyolefinic facing layer contains an anti-blocking agent, and wherein one polyolefinic facing layer is metallizable, (b) co-extruding said melts through a flat film die, wherein said first polyolefinic facing layer is co-extruded on a first side of said base layer and said second polyolefinic facing layer is co-extruded on a second side of said base layer; (c) solidifying said co-extruded film by cooling; (d) longitudinally stretching said co-extruded film at a temperature from about 120° to 130° C. in a ratio of from about 5 to 7:1; (e) transversely stretching said co-extruded film at a temperature from about 160° to 170° C. in a ratio of from about 8 to 10:1; and (f) corona-treating said metallizable facing layer of said co-extruded film, (g) whereby the neutralizing agent reduces corrosion of processing equipment during stretching.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1, wherein said corona treatment is carried out using an alternating current of about 10,000 V and 10,000 Hz.
Claim 4
Dependent Claim
26 words
A process as claimed in claim 1, wherein the polyolefinic facing layer formed from one of said melts provided in steps (a)(ii) and (a)(iii) is non-heat-sealable.
Claim 5
Dependent Claim
28 words
A process as claimed in claim 3, wherein said polyolefinic facing layer formed from said melt provided in step (a)(ii) or (a)(iii) further comprises a saturated hydrocarbon resin.
Claim 6
Dependent Claim
38 words
A process as claimed in claim 4, wherein said saturated 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 7
Dependent Claim
31 words
A process as claimed in claim 5, wherein said anti-blocking agent, said stabilizer, said saturated hydrocarbon resin and said calcium carbonate are incorporated in said melt by means of a masterbatch.
Claim 8
Dependent Claim
26 words
A process as claimed in claim 1 including depositing a metal layer on at least one surface of said film by electroplating, sputtering or vacuum deposition.
Claim 9
Dependent Claim
28 words
A process as claimed in claim 7, wherein said metal layer is comprised a metal selected from the group consisting of aluminum, zinc, gold, silver and alloys thereof.
Claim 10
Dependent Claim
16 words
A process as claimed in claim 8, wherein said metal is aluminum or an aluminum alloy.
Claim 11
Dependent Claim
20 words
A process as claimed in claim 7, wherein said metal layer has a thickness from about 20 to 600 nm.
Claim 12
Dependent Claim
16 words
A process as claimed in claim 10, wherein said thickness is about 25 to 100 nm.
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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) | 1995-03-17 | 1995-09-16 | 1996-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-17 | 1999-09-16 | 2000-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-17 | 2003-09-16 | 2004-03-17 | $7700.00 | Window Closed / Lapsed |