Biaxially stretched polyethylene film
US5306549A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1991 |
| Grant date | Apr 26, 1994 |
| Priority date | — |
| Expiry date | Mar 27, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a biaxially stretched film whose main component is a linear low density polyethylene showing, in measurement of a melting point by a differential scanning calorimeter, a main peak temperature (Tma) within the range of 118.degree..+-.5.degree. C. in a melting curve obtained when after a temperature of the polyethylene is kept at 190.degree. C. for 30 minutes, the temperature is dropped down to 20.degree. C. at a cooling rate of 100.degree. C./minute and subsequently raised at a heating rate of 10.degree. C./minute (hereinafter referred to as "melting curve after rapidly cooling") and showing a temperature difference between Tma and Tmb of at least 3.degree. C. wherein Tmb is a main peak temperature in a melting curve obtained when after the temperature of the polyethylene is kept at 190.degree. C. for 30 minutes, the temperature is dropped down to 20.degree. C. at a cooling rate of 10.degree. C./minute and subsequently raised at a heating rate of 10.degree. C./minute (hereinafter referred to as "melting curve after gradually cooling") (hereinafter referred to as "lowered melting point polyethylene in rapidly cooling"). Since this film is excellent in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.