US5318834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric films
Assignee: Treofan Germany GmbH and Co KG
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Filing: 1992-12-02
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Granted: 1994-06-07
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Expires: 2012-12-02
Abstract
Abstract Biaxially oriented polymeric films consisting of a core layer of voided polypropylene with a layer of non-voided polypropylene homopolymer on one surface and a layer of a heat sealable polymer on the non-voided layer, the other surface of the core layer having at least one non-voided polymeric layer thereon. Such films have shown good puncture resistance combined with good gloss for the heat sealable polymer layer on the non-voided homopolymer layer.
Inventors
- 👤 Jonathan P. Foulkes
- 👤 David Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:19
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/16; B32B27/18; B32B27/20; B32B27/30; B32B27/308; B32B3/00; B32B3/26; B32B2250/00; B32B2250/05; B32B2250/24; B32B2250/242; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/718; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2323/10; B32B2439/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249956; Y10T428/249958; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/31909
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
A biaxially oriented polymeric film comprising a core voided polymeric polypropylene homopolymer with a layer of pigmented substantially non-voided polypropylene homopolymer thereon and a layer of a heat sealable polymer on the layer of non-voided polypropylene homopolymer so that the film is heat sealable, the other surface of the voided polymeric polypropylene homopolymer core layer having at least one non-voided; non pigmented polymeric layer thereon; said non-voided layers being of sufficient thickness to impart puncture resistance to the film.
Claim 2
Dependent Claim
79 words
A biaxially oriented polymeric film comprising a core voided polymeric polypropylene homopolymer with a layer of pigmented substantially non-voided polypropylene homopolymer thereon and a layer of a heat sealable polymer on the layer of non-voided polypropylene homopolymer so that the film is heat sealable, the other surface of the voided polymeric polypropylene homopolymer core layer having at least one non-voided; non pigmented polymeric layer thereon; said non-voided layers being of sufficient thickness to impart puncture resistance to the film.
Claim 3
Dependent Claim
26 words
A film according to claim 1, wherein the said at least one non-voided non pigmented polymeric layer on the core layer comprises a single polymeric layer.
Claim 4
Dependent Claim
31 words
A film according to claim 1, wherein the said at least one non-voided non pigmented polymeric layer comprises a layer of a polypropylene homopolymer and a high or low density polyethylene.
Claim 5
Dependent Claim
47 words
A film according to claim 1, wherein the at least one non-voided non pigmented polymeric layer on the core layer comprises a further layer of non-voided non pigmented polypropylene homopolymer on the core layer and a layer of a heat sealable polymer on the said further layer.
Claim 6
Dependent Claim
37 words
A film according to claim 4, wherein the said further layer of non-voided non pigmented polypropylene homopolymer is of substantially the same polymer as the non-voided pigmented polypropylene homopolymer on the other surface of the core layer.
Claim 7
Dependent Claim
13 words
A film according to claim 1, wherein the core layer includes a pigment.
Claim 8
Dependent Claim
38 words
A film according to claim 1, wherein the film includes a heat sealable layer of a propylene/ethylene copolymer containing not more than 10 percent by weight of units derived from ethylene, or a layer of a propylene homopolymer.
Claim 9
Dependent Claim
23 words
A film according to claim 1, wherein at least one outer surface of the film has been treated to increase its surface energy.
Claim 10
Dependent Claim
20 words
A film according to claim 1, wherein at least one outer surface thereof has had a metal coating applied thereto.
Claim 11
Dependent Claim
21 words
A film according to claim 1, wherein at least one outer surface thereof has a layer of an acrylic polymer thereon.
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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) | 1997-06-06 | 1997-12-06 | 1998-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-06 | 2001-12-06 | 2002-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-06 | 2005-12-06 | 2006-06-07 | $7700.00 | Window Closed / Lapsed |