Process for preparing branched polycarbonate

Details Process for preparing branched polycarbonate Process for preparing branched polycarbonate

2006-06-06

2006-06-06

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C524S262000, C524S492000, C525S066000, C525S067000, C525S146000, C525S147000, C528S193000, C528S198000

Reexamination Certificate

active

07057005

ABSTRACT:
The present invention is a process for producing branched polycarbonate providing for optimum utilization of the branching agent. It was surprisingly found that adding at least a portion of the coupling catalyst to the polymerization at a point during the oligomerization in the reaction results in a higher degree of branching and improved rheological properties.

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Marks, M.J; Munjal, S; Namhata, S.; Scott, D.C.; Bosscher, F.; De Letter, J.A.; Klumperman, B; “Randomly Branched Bisphenol A Polycarbonates. I. Molecular Weight Distribution Modeling, Interfacial Synthesis, and Characterization” Journal of Polymer Science: Part A, Polymer Chemistry, vol. 38, 560-570 (2000).

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