Polyolefin laminate cling films
US5175049A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1989 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Apr 27, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A wrap-packaging film having differential cling is provided by a film laminate, said film laminate comprising at least two layers, PA1 at least one of which layers is an outer reverse layer comprising a linear very low density ethylene copolymer (LVLDPE) having a critical density of less than about 0.915 g/cc which contains a tackifier in an amount sufficient to impart thereto an effective level of cling properties, PA1 at least one of which layers comprises an obverse layer of an olefin polymer or copolymer, such as a linear low density ethylene copolymer (LLDPE) which has a critical density of not less than 0.916 g/cc which has little or no cling, PA1 and wherein the difference in density between the reverse layer and the obverse layer is at least about 0.004 g/cc, PA1 the said differential cling properties being manifested in the higher level of cling of the LVLDPE reverse layer as compared to that of the obverse layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.