C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/301
C08F 222/02 (2006.01)
Patent
CA 1277088
ABSTRACT OF THE INVENTION Very small amounts of certain metal ions promote copolymerization of aliphatic dicarboxylic acids with .alpha., .beta.-ethylenically unsaturated monomers in an aqueous solution system maintained at a given pH range, whereby the amount of unreacted dicarboxylic acid monomer is significantly reduced while control of molecular weight of the resulting copolymers is maintained. The invention relates to the production of aqueous solutions or dispersions of copolymers of aliphatic dicarboxylic acids, which dispersions have a very low residual content of unpolymerized dicarboxylic acid monomer. Such copolymers are useful as antisealants, dispersants, detergent additivec, deflocculants and fluid retention aids for water-based drilling fluids used in oil drilling operations.
529162
Gowling Lafleur Henderson Llp
National Starch And Chemical Investment Holding Corporation
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