Patent EA-000881-B1 (EA)
Title: Process for the polymerization of vinyl chloride in aqueous suspension using solution of dialkyl peroxydicarbonates and process for producing a solution of dialkyl peroxydicarbonates
Inventor: BODART VINCENT
IPC: C08F4/28
Filed: 1997-01-10
Abstract: 1. A process for the polymerization of vinyl chloride in aqueous suspension using dialkyl peroxydicarbomates, alkyl radicals of which contain 2 or 3 carbon atoms, characterized in that dialkyl peroxydicarbonateis used in the firm of a solution comprising substantially of dialkyl peroxydicarbonate and in a water insoluble liquid dialkyl alkanedicarboxylate. 2. A process for the polymerization as claimed in claim 1, characterized in that said process is carried out in the presence of comonomer(s) in amount not exceeding 50 molar % from the mixture of all monomers. 3. A process for the polymerization as claimed in claim 1, characterized in that dialkyl alcanedicarboxylate is selected from liquid esters which are derivatives of alkanedicarboxylate acids comprising from 4 to 10 carbon atoms, and alkanols comprising from 2 to 12 carbon atoms. 4. A process for the polymerization as claimed in claim 1, characterized in that dialkyl alcanedicarboxylate is selected from hexanedicarbonates, which are derivatives of adipicacid and alkanols comprising from 6 to 10 carbon atoms. 5. A process for the polymerization as claimed in claim 1, characterized in that the concentration of dialkyl peroxydicarbonate in the solution is 15-40 % by weight. 6. A process for the polymerization as claimed in claims 1 to 5, characterized in that diehyl or diisopropyl peroxydicarbonate in the form of o solution in hexanedicarboxylate, which is a derivative of adipic acid and alkanol comprising from 6 to 10 carbon atoms. 7. A process for producing a solution of dialkyl peroxydicarbonate, alkyl radicals of which comprise 2 or 3 carbon atoms, characterized in that at the first step dialkyl peroxydicarbonateis produced, alkyl radicals of which comprise 2 or 3 carbon atoms by introducing into the reaction an aqueous medium an appropriate amountof halogenoformiate alkyl and inorganic peroxyde in the presence of an inrganic salt added in an amount sufficient to increase the density of the aqueous reaction medium, and at the second step the produced dialkyl peroxydicarbonate is separated by extraction by means of water in soluble solvent, thus producing asolution of dialkyl peroxydicarbonate in said solvent. 8. A process for producing a solution of dialkyl peroxydicarbonate as claimed in claim 7, characterized in that inorganic salt is used in an amount sufficient ti raise the density of the aqueous reaction medium to the value equal, at least, to 1,05. 9. A process for producing a solution of dialkyl peroxydicarbonate as claimed in claims 8 and 9, characterized in that said inorganic salt is sodium chloride. 10. A process for producing a solution of dialkyl peroxydicarbonate as claimed in claim 8, characterized in that said water insoluble solvent is selected from a plurality of water insoluble organic compounds, for example, from a plurality of plasticizers traditionally used for producing of polyvinylchloride. 11. A process for producing a solution of dialkyl peroxydicarbonate as claimed in claim 8, characterized in that said water insoluble solvent is selected from a plurality of dialkyl alkanedicarboxylates, which are derivatives of alkanedicarboxylic acid comprising from 4 to 8 carbon atoms, and alkanols comprising from 6 to 10 carbon atoms. 12. A process for producing a solution of dialkyl peroxydicarbonate as claimed in claim 8, characterized in that said water insoluble solvent is selected from a plurality of hexanedicarboxylates, which are derivatives of adipic aid and alkanol comprising from 6 to 10 carbon atoms. 13. A process for producing a solution of dialkyl peroxydicarbonate as claimed in claims 7 to 12, characterized in that at the second step water insoluble organic compounds are used as a water insoluble compound, for example, from a plurality of plasticizers used for polyvinylchloride.