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The Asaflex™ i series - New high-performance clear styrenic copolymers
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December
12, 2001
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The
Asaflex™ i series - New high-performance clear styrenic copolymers
High thermal stability, strong gelling resistance
Scheduled for early market introduction
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Asaflex™
i – Salient features
- Dramatically reduces gelling and
“fish-eye” formation under processing,
based on an advanced copolymeric molecular structure
that brings high thermal stability without additional
antioxidants.
- Matches or excels the established
standards of other Asaflex™ clear styrenic copolymers
for high performance, quality, and function.
Asaflex™
i – Inherent advantages
- Greater freedom from fish-eye formation,
lower haze, higher transparency.
- Higher-yield, higher-quality printing
characteristics, through reduced disruption and marring
of printing by fish-eye effects.
- Higher fabrication process efficiency,
with lower time and cost requirements for cleaning,
purging, and restarting,
through reduced gel formation in cylinder and flow
lines.
- Capability for higher extrusion speeds,
and corresponding reduction in process cost and time
requirements.
- Capability for significant reductions
in resin burn, in injection dies, extruder nozzles,
and hot runners.
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| Asaflex™
i – gelling resistance test |
The susceptibility of a resin to gel
formation generally increases with its thermal history.
This susceptibility was investigated
in the following gelling resistance test, by extrusion
of test sheets from an Asaflex™ i trial grade
and a standard Asaflex™ resin
at an elevated process temperature, and examination
of the plates for hazing at increasing extrusion times.
The extruded Asaflex™ i trial grade sheets show
no increase in hazing, and thus no significant gelation
increase,
throughout the five-hour period of test extrusion
at 250°C.
Test results
No perceptible increase in Asaflex™ i hazing
or gelation at any time during the five hours of extrusion
at 250°C.
Test conditions
| Formulations:
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Asaflex™ i trial
grade or standard Asaflex™ 825/polystyrene
at mixing ratio of 30/70,
the ratio of highest susceptibility to cross-linking
and thus to gel formation. |
| Extrusion
temp.: |
250°C (20°C
above the recommended maximum of 230°C for
standard Asaflex™.) |
| Samples: |
Extruded sheets of
0.2 mm thickness, taken periodically throughout
the test period. |
| Evaluation:
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Observation for increase
in internal hazing, expressed as percent increase
from initial level,
after treatment with paraffin oil for smooth surface. |
Please note that all data and values are given as
typical results obtained with the indicated test methods
for purposes of basic reference only and not as any
product specification or warranty of any nature, and
are subject to change without notice.
For further information on these Asahi Kasei products,
please contact
us.
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