Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1993-05-24
1994-04-05
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528125, 528126, 528171, 528174, 528196, 528198, 528202, C08G 6424
Patent
active
053006240
ABSTRACT:
A method is provided for making flame retardant polycarbonates by phosgenating a mixture of bisphenols having up to about 50 mole % of tetrahalobisphenols, such as tetrabromobisphenols. There is employed a mixture of a phase transfer catalyst and a tertiary organic amine to provide high molecular weight copolymer without excessive phosgene usage.
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Article-Chemosphre, vol. 20, Nos. 10-12, pp. 1921-1928 (1990) Tetrabromobisphenol A (TBBA), its Derivatives and their Flame Retarded (FR) Polymers--Content of Polybrominated Dibenzo-p-Dioxins (PBDD) and Dibenzofurans (PBDF)--PBDD/F Formation under Processing and Smouldering (Worst Case) Conditions, J. Thies et al.
Article--Popular Plastics, Mar. 1983, (3 pages) Copolycarbbonates of Bisphenol-A and Tetra-halobisphenols-A: Synthesis and Characterization: Part III, KK Sharma et al.
Article--Polymer Bulletin 25, Jun. (1991) pp. 583-590, HPLC Analysis of Tetrabromobisphenol-A Polycarbonate Oligomers, Its Applications in Interfacial Phosgenation Reaction, Jen-Tau Gu and Chun-Shan Wang.
Article--Industrial & Engineering Chemistry, vol. 51, No. 2--Feb. 1959--pp. 157-160 Linear Aromatic Polyesters of Carbonic Acid, H. Schnell.
Boden Eugene P.
Phelps Peter D.
Anderson Harold D.
General Electric Company
Pittman William H.
Teoli William A.
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