Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1997-12-09
2000-03-14
Dawson, Robert
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
525462, 525469, 528200, C08G 6400
Patent
active
060374373
ABSTRACT:
A method for producing an aromatic polycarbonate which comprises subjecting to a transesterification polymerization reaction at least one polymerizable material selected from a molten monomer mixture of an aromatic dihydroxy compound and a diaryl carbonate, and a molten prepolymer obtained from the monomer mixture, wherein the transesterification reaction is performed in one or more polymerizers which is or are connected through a pipeline system toward an outlet for a final aromatic polycarbonate product, wherein the pipeline system comprises one or more pipes through which a molten aromatic polycarbonate having a number average molecular weight increased by the transesterification polymerization reaction is passed while contacting an inner wall of the pipe or pipes, and wherein a molten aromatic polycarbonate having a number average molecular weight of less than 2,500 is passed through the pipe or pipes at a velocity of 0.05 m/sec. or more and a molten aromatic polycarbonate having a number average molecular weight of 2,500 or more is passed through the pipe or pipes at a velocity of 0.005 m/sec. or more. By the method of the present invention, a high quality aromatic polycarbonate which is not only highly colorless but also has a low foreign matter content can be produced by using an ordinary pipeline system comprising the pipe or pipes made of an ordinary material.
REFERENCES:
patent: 5519106 (1996-05-01), Nukui et al.
Hasegawa Kazumi
Komiya Kyosuke
Asahi Kasei Kogyo Kabushiki Kaisha
Aylward D.
Dawson Robert
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