NOVEL COMB COPOLYMER AND PROCESS FOR THE PREPARATION THEREOF
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United States of America Patent
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app pub date -
May 29, 2013
filing date -
Jun 15, 2012
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Abstract
A comb polymer of which the backbone is 2-acrylamido-2-methylpropanesulfonic acid, onto which poly(N-alkylacrylamide) or poly(N,N-dialkylacrylamide) lateral segments are grafted; process for the preparation thereof comprising: a step (a) of reacting a compound of formula (II) with a compound of formula (III), in a (tert-butanol)-water mixture, so as to obtain a poly(N-alkylacrylamide) or poly(N,N-dialkylacrylamide) telomere of formula (I); a step (c) of reacting, in tert-butanol, the telomer of formula (I) obtained in step (a), with an acid chloride of formula (IV) so as to obtain a solution of the macromonomer of formula (V); a step (e) of copolymerising, in tert-butanol, the macromonomer of formula (V) resulting from step (c), with the ammonium salt of 2-acrylamido-2-methylpropanesulfonic acid and, if desired, a step (f) of purifying the comb polymer obtained in step (e).
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