Coextruded film for chub packages
US5679422A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1995 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Jan 25, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31928
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A coextruded multilayer polymeric film for use as a chub film having a core layer of an oxygen barrier material and layers disposed on either side of the core layer comprising a blend of an ethylene alpha-olefin copolymer formed from a polymerization reaction in the presence of a single site catalyst and a tie or adhesive, or alternatively a blend of a tie or adhesive and an ethylene acid copolymer, including a neutralized ethylene acid copolymer such as an ionomer. The film also comprises outer sealant layers comprising a blend of an ethylene alpha-olefin copolymer formed from a polymerization reaction in the presence of a single site catalyst and optionally a compound selected from the group consisting of LLDPE, having a density of between about 0.910 g/cc to about 0.940 g/cc, and an ethylene acid copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.