Claims
- 1. A thermoplastic film comprising a core layer and at least one printing skin layer, wherein said core layer comprises an orientation-enhancing polymer, a polypropylene homopolymer, at least one beta crystal nucleator of polypropylene and optionally a water absorption additive.
- 2. The thermoplastic film of claim 1, wherein said orientation-enhancing polymer comprises an (isotactic propylene)-ethylene heterophasic copolymer and at least one polymer selected from the group consisting of:
an impact polypropylene polymer; an impact polypropylene copolymer; an α-olefin-(isotactic propylene) rubber; a metallocene isotactic polypropylene; an isotactic polypropylene grafted with elastomer; a maleated-isotactic polypropylene; a blend of an isotactic polypropylene and a syndiotactic polypropylene; a blend of an isotactic polypropylene and an atactic polypropylene; a blend of an isotactic polypropylene and an acrylic elastomer; a blend of an isotactic polypropylene and an alkenic elastomer; a blend of an isotactic polypropylene, a polyethylene, and an ethylene-propylene rubber; a blend of an isotactic polypropylene and a polyisobutylene; a blend of an isotactic polypropylene and a styrenic elastomer; a blend of an isotactic polypropylene and a metallocene isotactic polypropylene copolymer; and a blend of an isotactic polypropylene and an isotactic propylene copolymer.
- 3. The thermoplastic film of claim 1, wherein said printing skin layer comprises an impact polypropylene copolymer and a beta crystal nucleator of polypropylene.
- 4. The thermoplastic film of claim 1, wherein said printing skin layer comprises a polypropylene homopolymer, an orientation-enhancing polymer, a beta crystal nucleator of polypropylene, and a water absorption additive.
- 5. The thermoplastic film of claim 4, wherein said water absorption additive of the printing skin layer is at least one selected from the group consisting of CaCO3, BaCO3, clay, talc, silica, and a hygroscopic polymer.
- 6. The thermoplastic film of claim 5, wherein said water absorption additive is a hygroscopic polymer selected from the group consisting of polyethylene oxide, nonylphenol polyethylene glycol ether, polyvinyl alcohol, atactic salts of polyacrylic acid, syndiotactic salts of polyacrylic acid, and methacrylic acid copolymer and its salts.
- 7. The thermoplastic film of claim 1, wherein said printing skin layer has thickness of 1.25 μm or greater.
- 8. The thermoplastic film of claim 1, wherein said printing skin layer has thickness of 3.75 μm or greater.
- 9. The thermoplastic film of claim 1, further comprising an intermediate layer, located between the core layer and said printing skin layer.
- 10. The thermoplastic film of claim 9, wherein said intermediate layer has a thickness greater than 2.5 μm and comprises a polypropylene homopolymer, an orientation-enhancing polymer, a beta crystal nucleator of polypropylene and a water absorption additive.
- 11. The thermoplastic film of claim 10, wherein the total weight percentage of the water absorption additives of said the intermediate layer is greater than the total weight percentage of the water absorption additives of the printing skin layer.
- 12. The thermoplastic film of claim 9, wherein said intermediate layer has thickness greater than the thickness of said printing skin layer.
- 13. The thermoplastic film of claim 1, wherein said polypropylene homopolymer is an isotactic polypropylene.
- 14. The thermoplastic film of claim 13, wherein said isotactic polypropylene has m-pentad greater than 85% by NMR spectroscopy measurement.
- 15. The thermoplastic film of claim 1, wherein said printing skin layer surface is treated with corona, flame, or plasma.
- 16. The thermoplastic film of claim 15, further comprising an ink-jet print on said printing skin layer.
- 17. The thermoplastic film of claim 1, wherein said printing skin layer is an inkjet printable surface, water-based ink printable surface, solvent-based ink printable surface, UV-curable ink printable surface.
- 18. The thermoplastic film of claim 1, further comprising an outer skin layer comprising a water based pressure sensitive adhesive located on the side of said film opposite to said printing skin layer.
- 19. The thermoplastic film of claim 1, further comprising a cold glue layer located on the side of said film opposite to said printing skin layer.
- 20. The thermoplastic film of claim 1, wherein said beta crystal nucleator of polypropylene comprises a mixture of an organic dibasic acid and an oxide, a hydroxide, or an acid salt of a Group II metal.
- 21. The thermoplastic film of claim 1, further comprising an outer skin layer which has a composition which is the same as the core layer.
- 22. The thermoplastic film of claim 13, wherein said isotactic polypropylene comprises a mixture of at least two polypropylene polymers having different m-pentads by NMR spectroscopy measurement.
- 23. The thermoplastic film of claim l, wherein said core layers contains at least one water absorption additive selected from the group consisting of CaCO3, BaCO3, clay, talc, silica, and a hygroscopic polymer.
Parent Case Info
[0001] This Application is a “continuation-in-part” application of application Ser. No.: 10/135,321, filed Apr. 30, 2002.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
10135321 |
May 2002 |
US |
Child |
10278241 |
Oct 2002 |
US |