Production of chlorinated ethylene polymers

  • Inventors:
  • Assignees: Allied Chem
  • Publication Date: July 20, 1966
  • Publication Number: GB-1036360-A


Ethylene polymers or chlorinated ethylene polymers are chlorinated in the form of a slurry in an aqueous medium by a process which comprises contacting the polymer with elemental chlorine at a temperature of at least 10 DEG C. wherein (1) at least a part of the contacting is effected at 10 DEG to 130 DEG C. for a time sufficient to increase the chlorine content of the polymer by at least 4 weight per cent based on the ethylene polymer in the starting polymer, while the elemental chlorine is mixed with elemental oxygen in amount of at least 0.05 weight per cent but which does not average more than 20 weight per cent based on the chlorine; (2) if any contacting takes place at 10 DEG to 130 DEG C. under (1) such contacting takes place before the contacting under the conditions specified under (1) and the amount of elemental oxygen if any is less than 0.05 weight per cent; and (3) if any contacting takes place at a temperature above 130 DEG C. the amount of elemental oxygen, if any, mixed with the elemental chlorine is such that the amount of oxygen which reacts with the polymer during such contacting is not more than 0.1 weight per cent based on the weight of chlorine which reacts during such contacting. The polymer may be a homopolymer or copolymer of ethylene. Processes are described and exemplified in which polyethylene is chlorinated in a single stage in the presence of oxygen, in two stages to the second of which oxygen is added, and in three stages of which the second is effected at a temperature above 130 DEG C. and oxygen is added either to the third stage or to both the first and third stages.




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