Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2005-05-10
2005-05-10
Shameem, Golam M M (Department: 1626)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
C528S198000, C558S274000
Reexamination Certificate
active
06891015
ABSTRACT:
High yields of ester-substituted diary carbonates such as bis-methyl salicyl carbonate were obtained by the condensation of ester-substituted phenols with phosgene in the presence of a phase transfer catalyst (PTC) and optionally a tertiary amine catalyst in a solvent free reaction system comprising an aqueous phase held at a pH of 8.3 or higher. The optimized conditions of the present invention use an excess of ester-substituted phenol relative to phosgene and high conversion of phosgene to ester-substituted diaryl carbonate is observed. The product ester-substituted diaryl carbonate may be conveniently isolated as a solid by filtration or as a liquid in which the excess ester-substituted phenols serves as solvent. The method represents an attractive route for the manufacture of bis methyl salicyl carbonate and ester-substituted diaryl carbonates generally. The ester-substituted diaryl carbonates are useful for the preparation and modification of polycarbonates.
REFERENCES:
patent: 4323668 (1982-04-01), Brunelle
patent: 5696222 (1997-12-01), Kaneko et al.
patent: 6300459 (2001-10-01), Kaneko et al.
patent: 6410777 (2002-06-01), Kaneko et al.
patent: 6420512 (2002-07-01), McCloskey et al.
patent: 6469192 (2002-10-01), Burnell et al.
patent: 2159883 (1972-06-01), None
patent: 58129 (1991-02-01), None
patent: 980861 (2000-02-01), None
patent: 11302228 (1999-11-01), None
Copending U.S. Appl. No. 09/682,724 (8CL-6013), filed Oct. 10, 2001, Karlik et al., entitled “Method for End-Capping Polycarbonate Resin and Composition for Use in Same”.
Copending U.S. Appl. No. 09/682,723 (8CL-7394), filed Oct. 10, 2001, Whitney et al., entitled “Method for End-Capping Polycarbonate Resins and Compositions for Use in Same”.
Copending U.S. Appl. No. 10/167,903 (RD-29290-3), filed Jun. 12, 2002, McCloskey et al., entitled “Extrusion Method for Making Polycarbonate”.
Copending U.S. Appl. No. 09/911,505 (RD-29157), filed Jul. 24, 2001, McCloskey et al., entitled “Method of Polycarbonate Preparation by Solid State Polymerization”.
Copending U.S. Appl. No. 09/911,443 (RD-28473), filed Jul. 24, 2001, McCloskey et al., entitled “Method of Polycarbonate Preparation”.
Copending U.S. Appl. No. 10/118,634 (122013), filed Apr. 10, 2002, Smigelski et al., entitled “Method of Preparing Polyestercarbonates”.
Copending U.S. Appl. No. 10/167,901 (124621), filed Jun. 12, 2002, McCloskey et al., entitled “Method for Making an Aromatic Polycarbonate”.
Burnell Timothy Brydon
Cella James Anthony
Kailasam Ganesh
McCloskey Patrick Joseph
Caruso Andrew J.
General Electric Company
Patnode Patrick K.
Shameem Golam M M
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