Process for polymerization of vinyl chloride
AssigneeSolvay (Societe Anonyme)
InventorVincent Bodart
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Abstract
The dialkyl peroxydicarbonates with short alkyl chains, preferably diethyl and diisopropyl peroxydicarbonates, are used for the aqueous suspension polymerization of vinyl chloride, in the form of a solution in a dialkyl alkanedicarboxylate which is liquid and insoluble in water. The preferred solvents are hexanedicarboxylates (adipates) derived from adipic acid and from C6-C10 alkanols. The peroxydicarbonate concentration of the said solutions is generally 15-40% by weight. The process according to the invention produces vinyl chloride polymers of improved quality resulting in shaped articles exhibiting markedly fewer fisheyes.
Claims7
A process for aqueous suspension polymerization of vinyl chloride, optionally in a mixture with comonomers, said process employing at least one dialkyl peroxydicarbonate in which the alkyl radicals contain 2 or 3 carbon atoms, wherein the dialkyl peroxydicarbonate is provided in the form of a solution consisting essentially of the dialkyl peroxydicarbonate in a dialkyl alkanedicarboxylate which is liquid and insoluble in water.
Dependencies are inferred from the claim text.