Page 373 - Handbook of Plastics Technologies

PLASTICS ADDITIVES

PLASTICS ADDITIVES 5.53

FIGURE 5.13 Peroxides.

They are catalyzed by redox systems consisting of reducing sugars, iron soaps, and phos-
phates.
5.10.1.6 Peracetic Acid (CH CO H). This is used mainly in epoxidizing olefins such as
3
3
soybean oil for vinyl stabilizers and in synthesis of aliphatic epoxy resins.
5.10.1.7 Peroxyketals. These are particularly popular for cure of BMC and SMC unsat-
urated polyesters.
5.10.1.8 Peroxydicarbonates. These are the least stable class, often too unstable for
shipment, in which case they must be synthesized where they are going to be used. They
have become the leading initiator for vinyl chloride polymerization.

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