Broad sealing multi-layered opp films which yield hermetic seals
US5049436A · kind A · utility
22Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1990 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Jun 11, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A multilayer film is hermetically heat sealable over a broad temperature range. In one embodiment, a heat sealable layer is provided to a polypropylene core layer. The heat sealable layer comprises an ethylene-propylene copolymer and/or an ethylene-propylene-butene terpolymer with an inorganic antiblock agent having a particle size of at least 0.8 micron and at least about 1000 ppm of a fatty acid amide, the layer having a thickness of at least about 10-25% of the total film thickness. A metal-receiving layer may be provided to a surface of the core layer opposite the heat-sealable layer and the film may be metallized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.