Wire-wetting fall polymonization process for the production of polycarbonates
First Claim
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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Accused Products
Abstract
A method for producing an aromatic polycarbonate comprises feeding to a feeding zone (having a foraminous plate) at least one polymerizing material selected from the group consisting of a) a molten monomer mixture of an aromatic dihydroxy compound and a diaryl carbonate, and b) a molten prepolymer obtained by a process comprising reacting an aromatic dihydroxy compound with a diaryl carbonate, and allowing the polymerizing material to pass downwardly through the foraminous plate and fall along and in contact with a wire through a wire-wetting fall polymerization reaction zone, thereby effecting polymerization of the polymerizing material during the wire-wetting fall thereof. Colorless and high quality aromatic polycarbonates are thus stably produced at a high polymerization rate for a prolonged period of time, using an apparatus which has excellent sealing properties under high vacuum and maintenance of which is easy.
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Citations
16 Claims
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1. A method for producing an aromatic polycarbonate, which comprises:
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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, and a 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, and allowing 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification