Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Reexamination Certificate
2011-08-09
2011-08-09
Puttlitz, Karl J (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
C570S252000, C570S253000, C570S254000
Reexamination Certificate
active
07994373
ABSTRACT:
High assay, reaction-derived decabromodiphenylethane product is prepared by feeding (i) diphenylethane or (ii) partially brominated diphenylethane having an average bromine number less than about two, or (iii) both of (i) and (ii), into the liquid confines of a reaction mixture. Such reaction mixture is (a) formed from components comprised of excess liquid bromine and aluminum-based Lewis acid bromination catalyst, and (b) maintained at one or more elevated reaction temperatures of from about 45°-90° C., and at least when elevated pressure is needed to keep a liquid state in the reaction mixture at the temperature(s) used, the reaction mixture is at such an elevated pressure, whereby ar-bromination occurs. The feeding is conducted at a rate slow enough to form high assay reaction-derived decabromodiphenylethane product, which is an effective flame retardant.
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Yang, Ze-hui, et al., “Technological Progress in Catalytic Synthesis of Decabromodiphenyl Ether by Brominating Diphenyl Oxide with Bromine Chloride”, Fine Chemicals, vol. 19, Jan. 2002, pp. 42-44, abstract only translated.
Albemarle Corporation, XP002458574, Saytex 8010 Flame Retardant, Brochure, 2001, 2 pages.
Hussain Saadat
Mack Arthur G.
Albemarie Corporation
Kliebert Jeremy J.
Puttlitz Karl J
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