Method for processing polyethylene having a molecular weight of at least 400,000 by heating at an elevated pressure
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 13, 2002
Grant Date -
N/A
app pub date -
Oct 27, 1999
filing date -
Feb 17, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for processing ultra-high molecular weight polyethylene (UHMWPE) of at least 400,000 by heating under an elevated pressure, followed by cooling, wherein UHMWPE having a lamellar thickness <12 nm and a melting temperature at atmospheric pressure >141.degree. C. is used, by carrying out the heating under an elevated pressure via a transient hexagonal phase, which phase is represented by the hatched area in the Figure, which lies below the equilibrium line of the phase transition orthorhombic phase--liquid phase, which area is enclosed by points (P.sub.1, T.sub.1 '), (P.sub.2, T.sub.1 '), (P.sub.2, T.sub.2) and (P.sub.1, T.sub.1 ), wherein T.sub.1 and T.sub.2 represent the equilibrium temperatures associated with pressures P.sub.1 and P.sub.2 respectively, followed by heating to melting and cooling to ambient temperature.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully