DA 3303 E hostanox P-EPQ 09.07 RZ

Conclusion
Hostanox ® * P-EPQ ® has to be considered
as the additive of choice in
applications of polypropylene where
superior stabilization is required.
Particularly in clarified or nucleated
polypropylene, the use of Hostanox
P-EPQ safeguards excellent melt and
color stability during processing of
the resin.
6
Experimental
Third-generation polypropylene random
copolymer was melt compounded
with the respective additive formulations.
The following base stabilization
(BS) was used: 0.1 % calcium
stearate plus 0.05 % AO-2. Processing
stabilizers (PS) were applied at 0.1 %
and nucleating agents (NA) at a level
of 0.25 %.
Preparation of the Samples
Additives were dry blended with the
polymer and pre-extruded at 210 °C.
Multiple extrusions were carried out
on a single screw laboratory extruder
(compression ratio 1:3, L:D = 25, 50
rpm). The strand was chilled in water
and pelletized. These samples were
used for MFR characterization, reprocessing
and for injection molding
into 100 x 100 x 1 mm3 plaques on
an Arburg Allrounder 221-75-350 at
245 °C.