Reduction of reactor fouling and improvement in the thermal stability of pvc using nitrites

摘要

Discloses preventing, inhibiting or reducing undesirable polymer build-up on reactor surfaces in touch with the reaction mixture during polymerization of vinyl monomer by introducing a nitrite into contact with the reactor surfaces prior to formation of resinous thermoplastic polymer. Shortstopping of free radical vinyl halide polymerization using nitrites both alone and in combination with phenolic anti-oxidants is also disclosed.