US4883698A
Expired / Lapsed
US
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Multilayer film containing a biaxially oriented polypropylene film
Assignee: Hoechst AG
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Filing: 1988-01-11
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Granted: 1989-11-28
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Expires: 2008-01-11
Abstract
Abstract For packaging purposes, metallized multilayer films containing a biaxially oriented polypropylene film as a base layer should have high scratch resistance, good heat-sealing properties, such as low heat-sealing temperature, attractive visual properties, such as high metallic luster, excellent metallizability of the base layer or of a covering layer, and also good processing properties during metallization, printing, slitting, and during processing on fast-running packaging machines. This requirement profile is fulfilled by a multilayer film of asymmetric structure containing a biaxially oriented base layer 4 composed of polypropylene, a heat-sealing layer 3 which contains an additive combination composed of pigment in platelet form and siloxane and which is optionally modified by an addition of polypropylene and a hydrocarbon resin, and of a corona-treated polypropylene covering layer 2 which is not capable of being heat-sealed. A corona-treated, heat-sealable copolymer may also be used as the covering layer 2, instead of a covering layer 2 composed of non-heat-sealable polypropylene. The covering layer 2 can also be omitted; in that case the surface of the base layer 4 is metallized. Tubular bags, jackets, containers of various shape for packaging foodstuffs, including the vacuum packaging of foodstuffs, are manufactured from this multilayer film.
Inventors
- 👤 Lothar Bothe
- 👤 Guenther Crass
- 👤 Siegfried Janocha
- 👤 Gunter Schloegl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:05
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B15/00; B32B15/04; B32B15/08; B32B27/06; B32B27/08; C; C08; C08F; C08F2/00; C08F2/04; C08F2/06; C08F2/08; G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; B32B2255/00; B32B2255/10; B32B2255/20; B32B2255/205; B32B2311/00; B32B2311/24; B32B2323/00; B32B2323/10; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/1359; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
136 words
A multilayer film comprising: a biaxially oriented polypropylene film as a base layer; a first surface layer comprising a metal layer deposited by metallization on a surface which is free from organic additives, such as lubricants or antistatic agents, and which has been exposed to a corona discharge before the metallization, wherein said surface is a surface of said base layer or a surface of an intermediate layer; and a second surface layer comprising a heat-sealing layer containing an additive combination comprising an inorganic pigment and a polydiorganosiloxane, wherein said heat sealing layer is applied on the surface of said base layer opposite said first surface layer and comprises an ethylene, ethylene/propylene, ethylene/butylene propylene/butylene or ethylene/propylene/butylene polymeric material or a mixture of said polymeric materials, and wherein said inorganic pigment comprises aluminum silicate in platelet form.
Claim 2
Dependent Claim
136 words
A multilayer film comprising: a biaxially oriented polypropylene film as a base layer; a first surface layer comprising a metal layer deposited by metallization on a surface which is free from organic additives, such as lubricants or antistatic agents, and which has been exposed to a corona discharge before the metallization, wherein said surface is a surface of said base layer or a surface of an intermediate layer; and a second surface layer comprising a heat-sealing layer containing an additive combination comprising an inorganic pigment and a polydiorganosiloxane, wherein said heat sealing layer is applied on the surface of said base layer opposite said first surface layer and comprises an ethylene, ethylene/propylene, ethylene/butylene propylene/butylene or ethylene/propylene/butylene polymeric material or a mixture of said polymeric materials, and wherein said inorganic pigment comprises aluminum silicate in platelet form.
Claim 3
Dependent Claim
18 words
A multilayer film as claimed in claim 1, wherein the siloxane in the heat-sealing layer comprises a polydialkylsiloxane.
Claim 4
Dependent Claim
21 words
A multilayer film as claimed in claim 1, wherein the heat-sealing layer further comprises a polypropylene homopolymer and/or a hydrocarbon resin.
Claim 5
Dependent Claim
60 words
A multilayer film as claimed in claim 1, wherein the heat-sealing layer is comprised of an olefin resin mixture comprising an ethylene/propylene/butylene terpolymer and a propylene/butylene copolymer, having a content of from about 0.1 to 7 % by weight of ethylene, from about 53 to 89% by weight of propylene and from about 10 to 40% by weight of butylene.
Claim 6
Dependent Claim
24 words
A multilayer film as claimed in claim 1, wherein the heat-sealing layer has a heat-sealing temperature of less than or equal to 100° C.
Claim 7
Dependent Claim
38 words
A multilayer film as claimed in claim 1, wherein the siloxane comprises a dimethylpolysiloxane having a viscosity of from about 1,000 to 50,000 mm 2 /sec at 25 C in the concentration of 0.2 to 0.8% by weight.
Claim 8
Dependent Claim
41 words
A multilayer film as claimed in claim 1, comprising said intermediate layer between said base layer and said metal layer, said intermediate layer containing from about 0.1 to 0.7% by weight of an inorganic pigment and comprising a non-heat-sealable corona-treated polypropylene.
Claim 9
Dependent Claim
19 words
A multilayer film as claimed in claim 1, having a film thickness of from about 10 to 35 μm.
Claim 10
Dependent Claim
19 words
A multilayer film as claimed in claim 1, having a film thickness of from about 10 to 30 μm.
Claim 11
Dependent Claim
22 words
A multilayer film as claimed in claim 1, wherein the thickness of the heat-sealing layer is from about 0.1 to 1.5 μm.
Claim 12
Dependent Claim
22 words
A multilayer film as claimed in claim 10, wherein the thickness of the heat-sealing layer is from about 0.3 to 1 μm.
Claim 13
Dependent Claim
22 words
A multilayer film as claimed in claim 7, wherein the thickness of the intermediate layer is from about 0.1 to 1.5 μm.
Claim 14
Dependent Claim
22 words
A multilayer film as claimed in claim 12, wherein the thickness of the intermediate layer is from about 0.3 to 1 μm.
Claim 15
Dependent Claim
32 words
A multilayer film as claimed in claim 1, wherein the metal layer is comprised of aluminum wherein the specific surface resistance of the metal layer is from about 1 to 5 Ω·cm.
Claim 16
Dependent Claim
21 words
A multilayer film as claimed in claim 1, wherein the metal layer is applied to a layer that is not heat-sealable.
Claim 17
Dependent Claim
14 words
A multilayer film as claimed in claim 1, consisting essentially of the recited layers.
Claim 18
Dependent Claim
17 words
A package comprising at least one wall made of the multilayer film as defined by claim 1.
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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) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |