Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2006-07-04
2006-07-04
Boykin, Terressa (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
C073S040700, C528S176000, C528S219000, C528S198000
Reexamination Certificate
active
07071284
ABSTRACT:
An improvement in the continuous two-phase interfacial condensation process for preparing polycarbonate is disclosed. In the process that entails at least one diphenol, phosgene, at least one chain terminator, and optionally branching agents and is carried out in the presence of a catalyst the improvement comprising maintaining the concentration of the catalyst at a level of at least 0.012 mol per mol of diphenol.
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patent: 4558118 (1985-12-01), Sikdar
patent: 5235026 (1993-08-01), Wulff et al.
patent: 6613868 (2003-09-01), Kauth et al.
patent: 2002/0151672 (2002-10-01), Kauth et al.
patent: 1118146 (1968-06-01), None
patent: 42 27 372 (1993-04-01), None
Heuser Jürgen
Kauth Hermann
Kords Christian
Bayer Aktiengesellschaft
Boykin Terressa
Gil Joseph C.
Preis Aron
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