Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having a nitrogen atom directly bonded to the...
Reexamination Certificate
2007-05-03
2010-02-23
Boykin, Terressa M (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having a nitrogen atom directly bonded to the...
C264S176100, C264S219000, C528S196000, C528S198000, C528S271000, C528S274000, C568S724000, C568S751000, C568S810000
Reexamination Certificate
active
07666977
ABSTRACT:
Disclosed herein is a process to prepare a poly(carbonate-co-urea) copolymer comprising reacting in the melt: (a) a dihydroxy reaction component comprising a dihydroxy compound, (b) a diaryl carbonate reaction component comprising a diaryl carbonate, (c) a urea reaction component comprising a urea compound in the presence of (d) a transesterification catalyst during at least part of the reaction and removing a phenolic byproduct to produce a poly(carbonate-co-urea) copolymer, wherein the urea and dihydroxy compounds are reacted in a molar ratio: (total moles of urea compound)/((total moles of urea compound)+(total moles of dihydroxy compound)) of less than or equal to 0.5.
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Kamps Jan Henk
Kung Edward
Lens Jan-Pleun
Boykin Terressa M
SABIC Innovative Plastics IP B.V.
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