Process for making an acrylic monomer having one or more...

Details Process for making an acrylic monomer having one or more... Process for making an acrylic monomer having one or more...

2008-03-19

2010-12-28

Cain, Edward J (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S311000, C526S312000

Reexamination Certificate

active

07858722

ABSTRACT:
A method for making a monomer having an ethylenically unsaturated group and two or more quaternary ammonium groups per molecule, comprising:(a) reacting an excess of a monomeric reactant having at least one ethylenically unsaturated group and at least one tertiary amino group per molecule with a halohydroxyalkyl(trialkyl)quaternary ammonium salt, in an aqueous medium,(b) monitoring the pH of the aqueous medium from at least as early as the time when all reactants have been added to aqueous medium until completion of the reaction, and(c) adjusting the pH of the aqueous medium to and maintaining the pH of the aqueous medium at a value greater than or equal to 9, from the time, after all reactants have been added to aqueous medium, that the reaction mixture exhibits an apparent pH minimum until completion of the reaction.

REFERENCES:
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patent: 4973637 (1990-11-01), Morgan et al.
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patent: 6596261 (2003-07-01), Adjei et al.
patent: 2003/0223951 (2003-12-01), Geary et al.
Voeffray et al. 193 L-Carnitine. Novel Synthesis and Determination of the Optical Purity, 1987, Helvetica Chimica Acta, vol., pp. 2058-2064, especially p. 2060, Scheme 2, compound 5 to compound 8.

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