Uniaxially shrinkable biaxially oriented polypropylene film with HDPE skin
US6322883A · kind A · utility
45Cited by
41References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1997 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Feb 26, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A uniaxially heat-shrinkable, biaxially oriented, multilayer film having a polypropylene containing core layer and at least one high density polyethylene containing skin layer adjacent the core layer. The core layer contains isotactic polypropylene and a modifier which reduces the crystallization or crystallinity of the polypropylene by increasing chain imperfections or reducing isotacticity of the polypropylene resin. Examples of materials which are useful as modifiers include atactic polypropylene, syndiotactic polypropylene, ethylene-propylene-butene-1 terpolymer, polybutene-1, and linear low density polyethylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.