Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2003-04-18
2008-03-04
Boykin, Terressa (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
C502S150000, C502S164000, C502S168000, C502S208000, C502S209000, C528S198000, C562S045000
Reexamination Certificate
active
07339021
ABSTRACT:
The present invention relates to a method for preparing polycarbonate resin, and more particularly to a method for effectively preparing polycarbonate resin having a large molecular weight in a short time under a melt polymerization condition using a catalyst system comprising phosphoranylidene ammonium salts, which is stable and maintains superior reactivity during melt polymerization and solid state polymerization.
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PCT International Search Report; PCT/KR03/00799; Dated: Oct. 1, 2002.
PCT International Preliminary Examination Report; PCT/KR2003/000799; Dated: Oct. 1, 2002.
Hong Mi-Jeung
Kim Jong-Hun
Park Eun-Duck
Woo Boo-Gon
Boykin Terressa
Lerner David Littenberg Krumholz & Mentlik LLP
LG Chem Ltd.
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