Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1975-07-09
1977-02-15
Garvin, Patrick P.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
526 91, 526184, 526213, 526216, 526227, 526232, C08F 434, C08F 438
Patent
active
040081753
ABSTRACT:
Ethylenically unsaturated material susceptible to free-radical polymerization, e.g., vinyl chloride and unsaturated polyesters, is polymerized, e.g., in an aqueous medium with an alkaline buffering reagent and an initiator system comprising an acid anhydride, e.g., isobutyric anhydride, and a peroxygen compound selected from an organic peroxy acid (peracid), e.g., peracetic acid, and hydrogen peroxide. Optionally, a further organic free-radical type initiator, e.g., lauroyl peroxide, a dialkyl peroxydicarbonate or azobisisobutyronitrile, is used in combination with the acid anhydride and peroxygen compound.
Preferably, the anhydride and peroxygen compound are introduced separately into the polymerization medium. It is believed that at least a portion of the anhydride combines with the peroxygen compound to form the corresponding diacyl peroxide.
REFERENCES:
patent: 3312678 (1967-04-01), Crano
patent: 3312679 (1967-04-01), Crano
patent: 3763128 (1973-10-01), Lewis et al.
patent: 3775341 (1973-11-01), Barter
patent: 3787527 (1974-01-01), Meyer et al.
Garvin Patrick P.
PPG Industries Inc.
Stein Irwin M.
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