Multilayered film
US5169728A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1991 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Feb 28, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The multilayered film has a base layer (A) and at least one surface layer (B). The film-forming component of base layer (A) is at least one copolymer of A1) ethylene and A2) acrylic or methacrylic acid or an ionomer thereof in the absence of substantial amounts of other polymers. The film-forming component of base layer (B) is at least one copolymer of ethylene and up to about 25 weight percent of at least one alpha-olefin having from 3 to 12 carbon atoms, the copolymer having a density of about 0.880 to about 0.935 g/cm.sup.3, in the absence of substantial amounts of other polymers. The weight of the base layer (A) is from 25 to 75 percent by the total weight of (A) and (B). The overall thickness of the multilayered film is from about 5 to about 40 micrometers. The multilayered film is useful for wrapping food.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.