Claims
- 1. A nonoriented film comprising:
highly crystalline homopolymer polypropylene with a melt flow greater than 30 g/10 minutes, a nucleating agent, and polypropylene.
- 2. The film as recited in claim 1, wherein the amount of the highly crystalline polypropylene and the amount of nucleating agent are sufficient to enable the film to have requisite memory, modulus, and tearability, such that the film is able to hold a shape and to be easily torn, and wherein the requisite memory, modulus and tearability are achieved without orienting the film.
- 3. The film as recited in claim 1, wherein the amount of the highly crystalline polypropylene and the amount of the nucleating agent are sufficient to enable the film to break at an elongation of less than about 350% as measured by ASTM D 882 and to enable the film to have a secant modulus of greater than about 200,000 psi as measured in one direction by ASTM D 882, and wherein the film achieves the secant modulus of greater than about 200,000 psi and the ability to break at an elongation of less than 350% without orienting the film.
- 4. The film as recited in claim 1, wherein the amount of the highly crystalline polypropylene is at least 15% by weight of the film.
- 5. The film as recited in claim 1, wherein the amount of the highly crystalline polypropylene is in a range from about 30% to about 90% by weight of the film.
- 6. The film as recited in claim 1, wherein the amount of the highly crystalline polypropylene is in a range from about 40% to about 50% by weight of the film.
- 7. The film as recited in claim 1, wherein the highly crystalline polypropylene has a melt flow from about 30 g/10 minutes to about 50 g/10 minutes.
- 8. The film as recited in claim 1, wherein the highly crystalline polypropylene has a melt flow of about 40 g/10 minutes.
- 9. The film as recited in claim 1, wherein the amount of the nucleating agent is less than about 5% by weight of the film.
- 10. The film as recited in claim 1, wherein the polypropylene is homopolymer polypropylene with a melt flow of about 8 to about 20 g/10 minutes.
- 11. The film as recited in claim 1, wherein the film breaks at an elongation of less than about 350% as measured by ASTM D 882.
- 12. The film as recited in claim 1, wherein the film breaks at an elongation of less than about 100% as measured by ASTM D 882.
- 13. A nonoriented film comprising:
a core layer containing highly crystalline homopolymer polypropylene, polypropylene and a nucleating agent, wherein the highly crystalline homopolymer polypropylene has a melt flow of at least 20 g/10 minutes and two skin layers containing polypropylene and highly crystalline homopolymer polypropylene having a melt flow of at least 20 g/10 minutes
- 14. The film as recited in claim 13, wherein the amount of the highly homopolymer crystalline polypropylene is at least about 15% by weight of the film.
- 15. The film as recited in claim 13, wherein the amount of the nucleating agent ranges from about 0.1% to about 2% by weight of the film.
- 16. The film as recited in claim 13, wherein at least one of the skin layers further contains highly homopolymer crystalline polypropylene with a melt flow of at least 20 g/10 minutes.
- 17. The film as recited in claim 13, wherein the core layer contains a colorant.
- 18. A package comprising:
a film that has been shaped to hold a product;
wherein the film is formed from highly crystalline polypropylene with a melt flow of at least 20 g/10 minutes, a nucleating agent, and polypropylene, wherein the film has not been oriented before being shaped into the package, and wherein the package may be easily torn open and has sufficient memory and stiffness to retain a shape around the product contained in the package.
- 19. The film as recited in claim 18, wherein the amount of the highly crystalline polypropylene is at least 15% by weight of the film.
- 20. The film as recited in claim 18, wherein the amount of the highly crystalline polypropylene ranges from about 30% to about 90% by weight of the film.
- 21. The film as recited in claim 18, wherein the film breaks at an elongation of less than about 100% as measured by ASTM D 882.
- 22. The film as recited in claim 18, wherein the film has a thickness ranging from about 0.4 mil to about 2 mil.
- 23. The film as recited in claim 18, wherein the film has a thickness ranging from about 1 mil to about 2 mil.
RELATED APPLICATIONS
[0001] This utility patent application claims priority to U.S. Provisional Patent Application Serial No. 60/284,544 filed Apr. 17, 2001 entitled Non-Oriented, High Modulus Packaging Film with Excellent Tearability. Serial No. 60/284,544 is hereby incorporated by reference.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60284544 |
Apr 2001 |
US |