Tackified polyethylene layers in stretch/cling films
US5114763A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1990 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Dec 28, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A thermoplastic film is provided which is especially suited for use in stretch/cling applications such as, for example, the bundling, packaging and unitizing of foods and other goods. The film comprises a cling layer comprising a polyethylene, preferably low density polyethylene (LLDPE) and a compatible tackifier. The LLDPE has a density of from about 0.87 to about 0.92 g/cc, a melt index of from about 1 to about 30 dg/min and a ratio of weight average molecular weight to number average molecular weight (M.sub.w /M.sub.n) less than about 6. The blend has a glass transition temperature of about 0.degree. C. or less. The film may be a one-sided cling film having a polyolefin slip layer opposite the cling layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.