Heat-shrinkable packaging films with improved sealing properties and articles made thereof
US7147930B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2003 |
| Grant date | Dec 12, 2006 |
| Priority date | — |
| Expiry date | Jun 19, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31928
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A coextruded heat-shrinkable, biaxially-oriented multilayered packaging film comprising a first layer, a second polymer layer, a third polymer layer, and a fourth polymer layer wherein the first polymer layer comprises a first ethylene/α-olefin copolymer preferably, an ethylene/α-olefin copolymer having an α-olefin comprising 4–8 pendant carbon atoms, a melting point of less than 105° C., a molecular weight distribution Mw/Mn of from 1–2.7, a melt index of from 6.5–34 g/10 min. at 190° C., and is present in the first layer is an amount of from 50–100%, based on the total weight of said first layer. The second layer comprises a second ethylene/α-olefin copolymer having a melt index of from 0.85–6.0 g/10 min. Preferably, A is the cumulative total weight percentage of the first ethylene/α-olefin copolymer in all layers of the film and B is the cumulative total weight percentage of the second ethylene/α-olefin copolymer in all layers of the film, such that the relative amounts A and B satisfy the relationship 2A/B≦1. The invention includes a package comprising the coextruded heat-shrinkable, biaxially-oriented multilayered packaging film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.