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US5527601A
Expired / Lapsed
US
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Biaxially oriented polypropylene film
Assignee: Treofan Germany GmbH and Co KG
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Filing: 1994-02-07
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Granted: 1996-06-18
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Expires: 2014-02-07
Abstract
Abstract Biaxially oriented polypropylene films having a core layer of voided polypropylene homopolymer with a layer of non-voided polypropylene homopolymer on one surface thereof and an outer, printable layer on the non-voided layer, the core layer and/or the said non-voided layer including titanium dioxide. Such films can be used to produce labels, for example with densities in the range 0.55 to 0.80 despite the presence of the titanium dioxide.
Inventors
- 👤 Allan J. Crighton
- 👤 Helen A. Biddiscombe
- 👤 Didier Jupont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:16
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/32; B29; B29K; B29K2995/00; B29K2995/0018; B29K2995/0025; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/40; B32B2307/408; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/10; B32B2519/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/25; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A biaxially oriented polypropylene film comprising a core layer of voided polypropylene homopolymer; said core layer having first and second surfaces with a layer of non-voided polypropylene homopolymer on said first surface thereof and an outer, printable layer on the non-voided layer, and a polymeric layer on said second surface of said core layer, said polymeric layer having a mat surface; the core layer and/or the said non-voided layer including titanium dioxide as a component thereof and said voided polypropylene homopolymer containing chalk as a voiding agent.
Claim 2
Dependent Claim
87 words
A biaxially oriented polypropylene film comprising a core layer of voided polypropylene homopolymer; said core layer having first and second surfaces with a layer of non-voided polypropylene homopolymer on said first surface thereof and an outer, printable layer on the non-voided layer, and a polymeric layer on said second surface of said core layer, said polymeric layer having a mat surface; the core layer and/or the said non-voided layer including titanium dioxide as a component thereof and said voided polypropylene homopolymer containing chalk as a voiding agent.
Claim 3
Dependent Claim
24 words
A film according to claim 1, wherein the core layer contains titanium dioxide and the said non-voided layer is substantially free of titanium dioxide.
Claim 4
Dependent Claim
24 words
A film according to claim 1, wherein the said non-voided layer contains titanium dioxide and the core layer is substantially free of titanium dioxide.
Claim 5
Dependent Claim
41 words
A film according to claim 1, wherein each layer which includes titanium dioxide as a component thereof contains titanium dioxide in an amount which is up to 20 weight percent based upon the weight of the layer containing said titanium dioxide.
Claim 6
Dependent Claim
31 words
A film according to claim 4, wherein the titanium dioxide is present in an amount of from 3 to 15 percent by weight of the layers in which it is present.
Claim 7
Dependent Claim
22 words
A film according to claim 1, wherein said further polymeric layer comprises a blend of incompatible polymers which effects said matt surface.
Claim 8
Dependent Claim
48 words
A film according to claim 1, wherein the said further polymer layer has a heat seal threshold which is sufficiently low so that said film can be heat sealed to an article formed in an injection molding process without the use of hot melt adhesive or a lacquer.
Claim 9
Dependent Claim
21 words
A film according to claim 1, wherein at least one outer surface has been treated to increase the surface energy thereof.
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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) | 1999-06-18 | 1999-12-18 | 2000-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-18 | 2003-12-18 | 2004-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-18 | 2007-12-18 | 2008-06-18 | $7700.00 | Window Closed / Lapsed |