| Target
characteristic |
Basic technical data |
Keys to attainment
with Asahi Kasei Chemicals elastomer or Asaflex™ as modifier
|
| Impact strength |
Impact strength of extruded sheets from Asaflex™ blends
Low-temp. impact strength of sheets from Asaflex™/SC blends |
Virtually
every modifier imparts increased impact strength; optimum selection
depends on desired degree of increase, and on target product
stiffness, transparency, moldability, and other properties.
Modifier quantity requirement varies with grade.
Two or more modifiers in combination may further heighten performance
and quality. |
Folding endurance
Hinge properties |
Folding properties of extruded Asaflex™/GPPS blends
Asaflex™ hinge properties |
Blend in Asaflex™
or Tufprene™ to obtain folding endurance with GPPS and
other polymers ordinarily susceptible to fracture under folding.
Utilize superior hinge properties of Asaflex™ for transparent
cases, components, parts. |
Tensile strength
Elongation |
Tensile strength and elongation - typical
intrinsic test values
Elongation of extruded sheets from Asaflex™/GPPS blends |
Modifier's tensile
strength and strain test values are influenced by the structure
of its companion polymers in the product; use modifier’s
intrinsic test value as basic predictor of performance enhancement
in target product.
Blend in Asaflex™ or Tufprene™ to obtain elongation
with GPPS and other polymers ordinarily lacking elongation.
|
Flowability
Processing conditions |
Intrinsic melt flow rate
- typical ranges
Asaflex™ process conditions sampler |
The flowability
of the modifier is largely dependent on its MW, MW distribution,
styrene content, and polybutadiene-segment hydrogenation, and
on the phase-separation morphology which is characteristic of
the target product melt and the molding temperature.
Asaflex™ is often used in neat form and is amenable to
injection, T-die extrusion, blow, and other fabricating processes.
Appropriate temperatures vary with the process, as shown in
the Asaflex™
process conditions sampler, and care is necessary
to avoid gelation. |
Polystyrenes
(PS)
Polyolefins (PO) |
Impact strength
- baseline comparison |
Modifiers available
with compatibilities specifically appropriate for PS- and for
PO- based formulations, and also for PS/PO compatibilization.
Modifier selection based on morphology (modifier
dispersion) in the PS or PO blend. |
| Transparency |
Transparency of Asaflex™/PS and PP/Tuftec™ blends
Transparency of extruded sheets from Asaflex™ blends
Refractive index of Asaflex™ and other clear polymers
Specific gravity of Asaflex™/clear polymer blends |
Asaflex™
blends and PP/Tuftec™ blends provide outstanding transparency
together with specific combinations of softness or hardness
and other product characteristics.
Transparency of Asaflex™/PS blends varies with the Asaflex™
content and the Asaflex™ grade. Select the optimum grade
for desired results.
To obtain transparent blends of Asaflex™ and other clear
polymers, select component polymers with very closely matching
refractive indices.
Asaflex™ is lower in density than other clear polymers,
and thus facilitates weight reduction. |
