US5026592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opaque multilayered film having an inherent resistance to delamination
Assignee: Hoechst AG
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Filing: 1988-12-22
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Granted: 1991-06-25
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Expires: 2008-12-22
Abstract
Abstract Disclosed is an opaque, biaxially stretch-oriented, polyolefinic multilayered film comprising an opaque core layer and two transparent top layers. The core layer contains a mixture of 1) about 45 to 90% by weight of a thermoplastic polymer comprising propylene, 2) about 5 to 25% by weight of an inert, particulate filler, and 3) about 5 to 30% by weight of a hydrocarbon resin being compatible with the thermoplastic polymer and having a softening point in the range from about 100° to 160° C., the percentages being each time related to the total weight of the mixture. The top layers are free from admixtures comprising particulate filler and resin. The film possesses high resistance to delamination.
Inventors
- 👤 Siegfried Janocha
- 👤 Gunter Schloegl
- 👤 Guenther Crass
- 👤 Lothar Bothe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:25
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/32; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/40; B32B2307/41; B32B2307/412; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/10; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/24876; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24992; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/29; Y10T428/2982; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
99 words
A coextruded, biaxially stretch-oriented, opaque polyolefinic multilayered film comprising: a) a first transparent top layer; b) an opaque core layer comprising a mixture of 1) about 45 to 90% by weight of a thermoplastic polymer comprising propylene, 2) about 5 to 25% by weight of an inert, particulate filler, and 3) about 5 to 30% by weight of a hydrocarbon resin which is compatible with the thermoplastic polymer and has a softening point between about 100° to 160° C., and c) a second transparent top layer, the percentages being each time related to the total weight of the mixture.
Claim 2
Dependent Claim
99 words
A coextruded, biaxially stretch-oriented, opaque polyolefinic multilayered film comprising: a) a first transparent top layer; b) an opaque core layer comprising a mixture of 1) about 45 to 90% by weight of a thermoplastic polymer comprising propylene, 2) about 5 to 25% by weight of an inert, particulate filler, and 3) about 5 to 30% by weight of a hydrocarbon resin which is compatible with the thermoplastic polymer and has a softening point between about 100° to 160° C., and c) a second transparent top layer, the percentages being each time related to the total weight of the mixture.
Claim 3
Dependent Claim
14 words
A film as claimed in claim 1, wherein said polymer is a propylene homopolymer.
Claim 4
Dependent Claim
26 words
A film as claimed in claim 1, wherein said polymer is a copolymer or terpolymer comprising propylene and ethylene or (C 4 -C 8 ) alpha-olefins.
Claim 5
Dependent Claim
34 words
A film as claimed in claim 1, wherein said core layer further comprises from about 0.2 to 0.8% by weight, based on the weight of the mixture, of a stabilizer comprising a phosphite compound.
Claim 6
Dependent Claim
31 words
A film as claimed in claim 4, wherein said phosphite compound has the general formula I ##STR2## wherein R 1 and R 2 denote a nonylphenyl radical or a 2,4-di-tert-butylphenyl radical.
Claim 7
Dependent Claim
31 words
A film as claimed in claim 4, wherein said phosphite compound has the general formula I ##STR3## wherein R 1 denotes a phenyl radical, and R 2 denotes an n-decyl radical.
Claim 8
Dependent Claim
21 words
A film as claimed in claim 1, wherein said filler comprises from about 5 to 15% by weight of said mixture.
Claim 9
Dependent Claim
38 words
A film as claimed in claim 7, wherein said filler has an average particle size of about 0.2 to 4 μm, a particle geometry value of less than 8 and a degree of whiteness of at least 90%.
Claim 10
Dependent Claim
18 words
A film as claimed in claim 1, wherein at least one of said transparent top layers is heat-sealable.
Claim 11
Dependent Claim
19 words
A film as claimed in claim 1, wherein at least one of said transparent top layers is not heat-sealable.
Claim 12
Dependent Claim
17 words
A film as claimed in claim 10, wherein said transparent top layer comprises an isotactic propylene homopolymer.
Claim 13
Dependent Claim
33 words
A film as claimed in claim 1, wherein at least one of the surfaces of said film is provided with a layer comprising a cold-sealable layer, a metal layer or a paper layer.
Claim 14
Dependent Claim
35 words
A film as claimed in claim 1, wherein said transparent top layers have a thickness of about 0.1 to 5 μm, whereby the total thickness of said film is between about of 20 to 120μm.
Claim 15
Dependent Claim
20 words
A film as claimed in claim 13, wherein said transparent top layers have a thickness of 0.5 to 3 μm.
Claim 16
Dependent Claim
21 words
A film as claimed in claim 1, wherein said filler comprises calcium carbonate, titanium dioxide, silicon dioxide or an aluminum silicate.
Claim 17
Dependent Claim
16 words
A film as claims in claim, 1, wherein said filler comprises a polyester or a polyamide.
Claim 18
Dependent Claim
21 words
A film as claimed in claim 1, wherein the density of said core layer does not exceed 0.8 g/cm 3 .
Claim 19
Dependent Claim
21 words
A film as claimed in claim 17, wherein the density of said core layer does not exceed 0.65 g/cm 3 .
Claim 20
Dependent Claim
21 words
A film as claimed in claim 1, wherein the resistance to delamination of said core layer is at least 1.8N/15 mm.
Claim 21
Dependent Claim
21 words
A film as claimed in claim 19, wherein the resistance to delamination of said core layer is at least 2N/15 mm.
Claim 22
Dependent Claim
83 words
A film as claimed in claim 1, wherein said first transparent top layer has a thickness of about 0.1 to 2 μm and comprises a propylene copolymer or terpolymer, a mixture of two or more propylene copolymers or terpolymers, or polyethylene, with a maximum propylene content of 95.5% by weight, and wherein said second transparent layer has a thickness of about 1.5 to 5 μm and comprises a propylene homopolymer or a propylene/ethylene copolymer, with a minimum propylene content of 96.5% by weight.
Claim 23
Dependent Claim
19 words
An adhesive tape comprising an adhesive layer and a base film comprising a film as claimed in claim 1.
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) | 1994-06-24 | 1994-12-24 | 1995-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-24 | 1998-12-24 | 1999-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-24 | 2002-12-24 | 2003-06-25 | $7700.00 | Window Closed / Lapsed |