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Wire-wetting fall polymonization process for the production of polycarbonates

  • US 5,589,564 A
  • Filed: 02/01/1996
  • Issued: 12/31/1996
  • Est. Priority Date: 07/23/1993
  • Status: Expired due to Term
First Claim
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1. A method for producing an aromatic polycarbonate, which comprises:

  • feeding, to a feeding zone having a foraminous plate, at least one polymerizing material selected from the group consisting of;

    a molten monomer mixture of an aromatic dihydroxy compound and a diaryl carbonate, anda molten prepolymer obtained by a process comprising reacting an aromatic dihydroxy compound with a diaryl carbonate,said foraminous plate having at least one hole, said feeding zone communicating, through said at least one hole, with a polymerization zone comprising a wire-wetting fall polymerization reaction zone, said wire-wetting fall polymerization reaction zone having at least one wire in correspondence with said at least one hole, said at least one wire being securely held at one end thereof in an upper end portion of said wire-wetting fall polymerization reaction zone and extending downwardly through said wire-wetting fall polymerization reaction zone, so that said polymerizing material fed to the feeding zone is enabled to pass downwardly through said foraminous plate and fall along and in contact with said at least one wire toward the other end of said at least one wire, andallowing said polymerizing material to pass downwardly through said foraminous plate and fall along and in contact with said at least one wire through a wire-wetting fall polymerization reaction zone, to effect a wire-wetting fall polymerization of said polymerizing material,thereby obtaining a polymer at a bottom of said polymerization zone comprising said wire-wetting fall polymerization reaction zone.

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