Brittle polymeric film and tamper evident labels made therefrom
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 10, 2013
Grant Date -
Aug 26, 2010
app pub date -
Feb 23, 2010
filing date -
Dec 12, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A process for the production of a polymeric film comprising a copolyester having an acid component and a diol component, said acid component comprising a dicarboxylic acid and a sulfomonomer containing a sulfonate group attached to the aromatic nucleus of an aromatic dicarboxylic acid, said process comprising the steps of: (i) melt-extruding a layer of said copolyester; (ii) stretching the extrudate in at least one direction; (iii) heat-setting the film by raising the temperature of the stretched film to a temperature T1 in a first heating zone such that (TM−T1 is in the range of from 5 to 30° C., and then raising the temperature of the film to a temperature T2 in a second heating zone such that (TM−T2 is in the range of from 0 to 10° C., wherein TM is the peak melting temperature of the polymeric film; wherein T2 is greater than T1; and wherein the times which a transverse section of the film spends in the first and second heating zones are defined by t1 and t2, respectively, such that the ratio of t1 to t2 is at least 2:1; and a polymeric film obtainable thereby having an ultimate tensile strength at destruction in the range of 2 to 15 kgf/mm2 in the machine direction and 2.5 to 17 kgf/mm2 in the transverse direction.
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