Linear low density polyethylene cast film
US4780264A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1987 |
| Grant date | Oct 25, 1988 |
| Priority date | — |
| Expiry date | May 22, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/0063
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The draw resonance problems encountered when extrusion casting or extrusion coating linear low density polyethylene, LLDPE, are substantially alleviated by a polymer designed to have an I.sub.2 value in the range of about 0.1 to about 25, and an I.sub.10 /I.sub.2 ratio of not more than 8.3, preferably lower than 8.3. Line speeds approaching and even surpassing those attained with LDPE are made possible. This invention can even be used in conjunction with known prior methods for alleviating draw resonance problems with LLDPE and obtain the benefits of the combination. The I.sub.2 is measured in accordance with ASTM D-1238-190/2.16 and the I.sub.10 is measured in accordance with ASTM D-1238-190/10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.