Three layer film having a core layer of low pressure, low density polyethylene
US4364981A · kind A · utility
46Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1981 |
| Grant date | Dec 21, 1982 |
| Priority date | — |
| Expiry date | Jun 3, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A flexible co-extruded three layer film comprising outer layers of high pressure, low density polyethylene and a core layer of low pressure, low density polyethylene. The film is produced by a blown film tubular extrusion process at conventional rates and temperature and yet is free of melt fracture even though the low pressure, low density polyethylene would otherwise exhibit melt fracture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.