Heat shrinkable polypropylene laminate film
US5620803A · kind A · utility
22Cited by
3References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 29, 1996 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | May 29, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31931
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The heat shrinkable polypropylene film having an isotactic polypropylene layer as surface layers and a layer mainly composed of a syndiotactic polypropylene as an intermediate layer, having a shrinkage of not less than 25% at 100.degree. C. in the machine and transverse directions and being stretched at least two times in the machine and transverse directions, respectively. The film has a good packaging machine applicability and excellent propagation tear resistance, low temperature shrinkability and heat resistance, and is suitably used as a shrink packaging material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.