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O
H
HN
O
O
NH
H
O
Tinuvin 770
O
H
H
3
C
N
O
O
N
CH
3
H
O
Tinuvin 765
N
N
N
N
NN
NH
H
x
Chimassorb 119
HALS can be very effective. One explanation of their effectiveness is that
the hindered amine oxidizes to form a nitroxyl radical, which can react with
a polymer radical to form an alkoxy amine. The alkoxy amine can terminate
peroxy radicals and in the process regenerate the nitroxyl radical.
N
O
Nitroxyl radical
R
ROOR
Radical
ROO
N
O
Peroxy radical
R
Alkoxy amine
9.4 ANTISTATIC AGENTS
Antistatic agents are added to aid in the prevention of static build up and
sparking in the processing and usage of final parts. This can be critical to
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