Method for producing chloride by suspension polymerization

Abstract

Abstract A DIALKYL PEROXYDICARBONATE WHOSE ALKYL RADICAL HAS 1-8 CARBON ATOMS, AN ACETYL CYCLOHEXYL SULFONYL PEROXIDE OR A MIXTURE THEREOF IS ADDED TO VINYL CHLORIDE OR A MIXTURE OF VINYL MONOMERS HAVING VINYL CHLORIDE AS ITS MAIN COMPONENT, 0.001-0.5% BY WEIGHT, BASED ON THE WEIGHT OF THE MONOMERS(S), OF THE DIALKYL PEROXYDICARBONATE, ACETYLCYCLOHEXYL SULFONYL PEROXIDE OR MIXTURE THEREOF IS ADDED. THE RESULTANT MIXTURE IS MAINTAINED AT A TEMPERATURE NOT EXCEEDING 35*C. FOR 0.5 TO 2 HOURS. THE PH IS ADJUSTED TO 8-11. THE RESULTANT MIXTURE IS HEATED AT 4070*C. IN THE PRESENCE OF A POLYMERIZATION INITIATOR TO SUBSTANIALLY COMPLETE THE POLYMERIZATION. THE INITIATOR IS SELECTED FROM THE GROUP CONSISTING OF AZOBIS-2,4-DIMETHYLVALERONITRILE, AZOBISMETHOXYVALERONITRILE, AZOBISTRIMETHYLVALERONITRILE, TER-BUTYLPEROXYPIVALATE AND MIXTURES THEREOF. THE METHOD SUBSTANTIALLY PREVENTS POLYMER SCALE DEPOSITION ON THE INTERIOR WALLS OF THE POLYMERIZATION VESSEL. THE POLYMERIZATION INDUCTION PERIOD IS ELIMINATED. THE POLYVINYL CHLORIDE PRODUCED HAS LITTLE COLOR AND HAS SUPERIOR THERMAL STABILITY.

Inventors

• 👤 Shunichi Koyanagi
• 👤 Hajime Kitamura
• 👤 Kinya Ogawa
• 👤 Shigenobu Tajima

Bibliographic Details