12: PARTIALLY AROMATIC POLY(AMIDE)S 291
Viscometer at 30
◦
C. Additional independent research
agreed that a copper stabilizer can effectively improve
the long-term thermal stability of the formulation.
However, the production of mold vent-clogging
byproducts is also significantly increased, leading to
rapid clogging of vents [54]. Actually, formulations
without a copper stabilizer do not show rapid clog-
ging. In order to suppress the formation of mold vent-
clogging byproducts, high molecular, i.e., low volatile,
hindered phenols and secondary aryl amines must
be added besides copper stabilizers. Such formula-
tions exhibit, in addition to thermal stability, improved
injection molding characteristics.
12.4.3 Lubricants
During final processing in melt forming ...