EP0545650A1
Expired / Lapsed
EP
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Polymeric films
Assignee: Treofan Germany GmbH and Co KG
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Filing: 1992-11-30
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Granted: —
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Expires: 2012-11-30
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 Paul Foulkes
- 👤 David Williamson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 12:13
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: 12
Claim 1
Independent Claim
64 words
A biaxially oriented polymeric film comprising a core layer of voided polymeric polypropylene homopolymer with a layer of 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 polymeric layer thereon.
Claim 2
Dependent Claim
24 words
A film according to claim 1, wherein the said at least one non-voided polymeric layer on the core layer comprises a single polymeric layer.
Claim 3
Dependent Claim
32 words
A film according to claim 1 or claim 2, wherein the said at least one non-voided polymeric layer comprises a layer of a polypropylene homopolymer and/or a high or low density polyethylene.
Claim 4
Dependent Claim
46 words
A film according to any of the preceding claims, wherein the at least one non-voided polymeric layer on the core layer comprises a further layer of non-voided polypropylene homopolymer on the core layer and a layer of a heat sealable polymer on the said further layer.
Claim 5
Dependent Claim
34 words
A film according to claim 4, wherein the said further layer of non-voided polypropylene homopolymer is of substantially the same polymer as the non-voided polypropylene homopolymer on the other surface of the core layer.
Claim 6
Dependent Claim
16 words
A film according to any of the preceding claims, wherein the core layer includes a pigment.
Claim 7
Dependent Claim
19 words
A film according to any of the preceding claims, wherein a layer on the core layer includes a pigment.
Claim 8
Dependent Claim
18 words
A film according to claim 7, wherein at least one outer layer of the film includes a pigment.
Claim 9
Dependent Claim
41 words
A film according to any of the preceding claims, 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 10
Dependent Claim
26 words
A film according to any of the preceding claims, wherein at least one outer surface of the film has been treated to increase its surface energy.
Claim 11
Dependent Claim
23 words
A film according to any of the preceding claims, wherein at least one outer surface thereof has had a metal coating applied thereto.
Claim 12
Dependent Claim
24 words
A film according to any of the preceding claims, wherein at least one outer surface thereof has a layer of an acrylic polymer thereon.
References Cited (Backward Citations)
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