Stretched multilayer polypropylene film
US4584239A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1985 |
| Grant date | Apr 22, 1986 |
| Priority date | — |
| Expiry date | Jul 11, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2826
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A stretched multilayer polypropylene film is described, comprising a stretched crystalline polypropylene layer and a layer of a composition (Composition B) laminated on at least one side of said polypropylene layer, wherein the composition B comprises a homo- or copolymer composed mainly of ethylene, propylene or butene-1 and having a melting point of 150.degree. C. or less, and a vinylcycloalkane polymer in an amount of 0.05 wt ppm to 10 wt % calculated as a vinylcycloalkane unit. This multilayer film is greatly improved in optical properties such as excellent see-through properties without deteriorating its good heat sealability. Thus it is very useful for wrapping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.