Hermetically heat-sealable, pressure-reclosable packaging article containing substantially spherical homogeneous polyolefin
US6737130B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 2002 |
| Grant date | May 18, 2004 |
| Priority date | — |
| Expiry date | Mar 25, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31938
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A multilayer film has a hermetically heat-sealable, pressure-reclosable, outer heat seal layer which contains a blend of a substantially spherical homogeneous polyolefin (i.e., SSH polyolefin) with a different thermoplastic polymer. The SSH polyolefin is present in an amount of from about 20 to 80 weight percent, and the different thermoplastic polymer is present in the layer in an amount of from about 80 to 20 weight percent, based on total layer weight. The SSH polyolefin has at least 60 side chain branches per 1000 carbon atoms, and has a melt index of from about 1 to 10. The invention also includes a process for making the multilayer film. Also disclosed is a roll of film comprising a disposable outer layer which is directly and peelably adhered to a first surface of second layer comprising the SSH polyolefin, a packaging article comprising an inside layer comprising the SSH polyolefin. The invention also includes a process for making a sealed article in which the multilayer film is heat sealed to itself or another article by heating the seal layer to a temperature of at least 50° C. Finally, the invention includes a hermetically heat sealable, pressure reclosable multilaye…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.