Process for the suspension polymerisation of vinyl chloride

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 407/00 (2006.01) C07C 409/34 (2006.01) C07C 409/38 (2006.01) C08F 4/34 (2006.01) C08F 14/06 (2006.01)

Patent

CA 2244154

The peroxydicarbonates of dialkyl with short alkyl chains, preferably of diethyl and diisopropyl, are implemented for the polymerisation in aqueous suspension of vinyl chloride in the form of a solution in a water insoluble liquid dialkyl alkanedicarboxylate. The preferred solvents are hexanedicarboxylates (adipates) derived from adipic acid in C6-C10 alcanols. The concentration of peroxydicarbonate in said solutions is generally 15-40 % by weight. The process of the invention produces vinyl chloride polymers having an improved quality to fabricate shaped articles having substantally less fish-eyes. The invention also relates to a process for producing in two phases a solution of dialkyl peroxydicarbonates with short alkyl chains particularly appropriate for the aqueous suspension polymerisation of vinyl chloride. According to said process, an inorganic salt is implemented in the step of production of peroxydicarbonate (first step) and the latter is then separated by extraction by means of a water insoluble solvent (second step).

Les peroxydicarbonates de dialkyle à courtes chaînes alkyles, de préférence de diéthyle et de diisopropyle, sont mis en oeuvre à la polymérisation en suspension aqueuse du chlorure de vinyle sous la forme d'une solution dans un alkanedicarboxylate de dialkyle liquide et insoluble dans l'eau. Les solvants préférés sont les hexanedicarboxylates (adipates) dérivés d'acide adipique et d'alcanols en C6 à C10. La concentration en peroxydicarbonate desdites solutions s'élève généralement à 15-40 % en poids. Le procédé scion l'invention produit des polymères du chlorure de vinyle de qualité améliorée conduisant à des articles façonnés présentant nettement moins d'oeils-de-poisson. L'invention concerne également un procédé pour la fabrication en deux étapes d'une solution de peroxydicarbonates de dialkyle à courtes chaînes alkyles particulièrement adaptée à la polymérisation en suspension aqueuse du chlorure de vinyle. Selon ce procédé, on met en oeuvre un sel inorganique à l'étape de fabrication du peroxydicarbonate (première étape) et on sépare celui-ci ensuite par extraction au moyen d'un solvant insoluble dans l'eau (deuxième étape).

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