Plastics and Polymers
 
PQ’s ADVERA® 401P specialty zeolite works as an excellent co-stabilizer for PVC applications.  ADVERA® zeolite functions as a co-stabilizer in mixed-metal and tin stabilization systems to significantly improve their performance.  ADVERA® zeolite slows thermal decomposition and discoloration in both flexible and rigid PVC.  In addition to improved performance, ADVERA® 401P zeolite reduces the cost of the stabilization systems. 
How It Works

Fabrication of PVC products requires the addition of thermal stabilizers.  Milling or other processing of unstabilized PVC at elevated temperatures rapidly results in degradation; e.g. discoloration, formation of hydrogen chloride, and irreversible adhesion to equipment surfaces.
 
PVC discoloration is caused by the formation of conjugated double bonds in the PVC polymer chains as a result of the elimination of hydrogen chloride.  The HCl formed during this reaction further catalyzes the decomposition of the PVC.  ADVERA® 401P zeolite scavenges the HCl to reduce this acid concentration so as to decrease PVC discoloration and slow PVC decomposition.  

In stabilization systems based on zinc stearate, the stearic acid groups attach to the PVC polymer chains to stop further formation of the conjugated double bonds.  In that reaction, zinc chloride is formed, which catalyzes PVC decomposition.  Removal of the zinc chloride results in greater stability.  ADVERA® 401P zeolite is very effective as a zinc chloride or tin chloride scavenger.

Applications
Stabilizers for Plastics and Polymers
Health, Safety &
Environment
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