Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2005-12-09
2010-06-01
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
C528S198000, C528S405000, C558S266000
Reexamination Certificate
active
07728099
ABSTRACT:
The present invention relates to a process for preparation of polycarbonates with weight-average molar mass MW≧230,000 g/mol and with ≦2% by weight content of cyclic compounds, including the following steps:(a) reaction of at least one oxirane with carbon dioxide in the presence of a metal-polycarboxylic acid compound in an aprotic, non-water-miscible solvent at a temperature of from 40 to 120° C. and at a pressure of from 1 to 100 bar, where the molar ratio of monomer to metal-polycarboxylic acid compound is ≧75,(b) addition of an aqueous solution of an inorganic acid to the reaction mixture once the reaction has ended,(c) removal of the aqueous phase,(d) if appropriate, washing of the remaining organic phase with water, and(e) devolatilization and drying of the resultant slurry of the polycarbonate in the aprotic, non-water-miscible solvent,and to the polycarbonate prepared via the process, and also to the use of the polycarbonate.
REFERENCES:
patent: 3585168 (1971-06-01), Inoe
patent: 4943677 (1990-07-01), Rokicki
patent: 5026767 (1991-06-01), Inoue et al.
patent: 6211286 (2001-04-01), Schafheutle et al.
patent: 6617467 (2003-09-01), Muller et al.
patent: 2006/0135743 (2006-06-01), Park et al.
patent: WO 03/029325 (2003-04-01), None
International Search Report No. PCT/EP02/10406, dated Mar. 3, 2006, 4 pages.
Soga et al., Alternating Copolymerization of CO, and Propylene Oxide with the Catalysts Prepared from Zn(OH)2 and Various Dicarboxylic Acids, Polymer Journal, vol. 13, No. 4 pp. 407-410, 1981.
International Preliminary Report on Patentability, Chapter II, for International Application No. PCT/EP2005/013228 issued Sep. 7, 2007, 5 pages.
BASF SE
Boykin Terressa M
Connolly Bove & Lodge & Hutz LLP
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