Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Reexamination Certificate
2006-12-19
2006-12-19
Solola, Taofiq (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
C560S222000
Reexamination Certificate
active
07151190
ABSTRACT:
The invention concerns a method for making aqueous solutions of unsaturated quaternary ammonium salts of formula (I) by reacting, in the presence of water, N,N-dimethylaminoethyl acrylate with a quaternizing agent of formula (II): R—Cl, said method is characterized in that it consists in: (a) in a closed reactor containing 5 60 wt. % of N,N-dimethylaminoethyl acrylate required for the reaction and which has been pressurized with air or depleted air at 0.5 to 3 bars, carrying out the reaction by continuously introducing, at a temperature ranging between 35 to 65° C., the quaternizing agent (II), and water, and finally the remaining N,N-dimethylaminoethyl acrylate, until the desired concentration of salt (I) in the water is reached, the water being introduced only when 0–20 wt. % of the amount required for the quaternizing agent (II) reaction has been added; the introduction of the remaining N,N-dimethylaminoethyl acrylate starting only when 20–80 wt. % required for the quaternizing agent (II) reaction has been added; and the pressure at the end of the reaction capable of reaching 9 bars; then (b) in depressurizing while maintaining the oxygen content constant by simultaneous introduction of air and, after returning to atmospheric pressure, eliminating the residual quaternizing agent. In formule (I) and (II). R=methyl or benzyl.
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patent: 5912383 (1999-06-01), Riondel et al.
patent: 5919974 (1999-07-01), Riondel
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Esch Marc
Herbst Gilles
Riondel Alain
Arkema France (formerly Atofina)
Millen White Zelano & Branigan P.C.
Solola Taofiq
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