Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2008-06-24
2008-06-24
Boykin, Terressa M (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
C502S162000, C502S164000, C502S167000, C502S208000, C502S213000, C528S196000
Reexamination Certificate
active
07390868
ABSTRACT:
Provided are a catalyst for producing polycarbonate comprising a reaction product obtained by reacting (a) a catalyst carrier containing nitrogen or phosphorus with (b) a palladium compound and (c) a metal compound having a redox catalytic ability and a production process for polycarbonate, comprising a first step in which an aromatic dihydroxy compound and monovalent phenol are reacted with carbon monoxide and oxygen to produce a polycarbonate prepolymer and a second step in which the above polycarbonate prepolymer is subjected to solid state polymerization to produce polycarbonate, wherein the above catalyst is used in the first step described above. The catalyst of the present invention is readily separated from polycarbonate and can repeatedly be used, and the above catalyst makes it possible to efficiently produce polycarbonate of a high quality without using harmful chlorine gas and phosgene and halogenated organic solvents such as dichloromethane and chloroform which are considered to exert an adverse effect on the environment.
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Okamoto Masaya
Sugiyama Jun-ichi
Ueda Mitsuru
Boykin Terressa M
Idemitsu Kosan Co. Ltd.
National Institute of Advanced Industrial Science and Technology
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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