C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/1349, 402/25
C08F 20/38 (2006.01) C08F 8/36 (2006.01) C08F 20/32 (2006.01) C08F 251/00 (2006.01)
Patent
CA 1107443
ABSTRACT OF THE DISCLOSURE The known methods for modifying polymers by intro- ducing sulfonate or sulfonic acid groups in the polymer chains have not resulted in products having satisfying characteristics. According to one known method a sulfonate monomer is used at the polymerization stage and according to another a polymer, e.g. polystyrene, is treated with a strong sulfonating agent e.g., sulfurtrioxide; this invention provides a two steps proc- ess for the preparation of polymers, which will contain an easily controllable amount of sulfonate groups. In the first step a copolymerization or a graft copolymerization is carried out using a controlled amount of an epoxy group containing monomer, the monomer being an ester of 2,3-epoxy propyl alcohol and acrylic acid. In the second step, the epoxy groups of the polymer prepared in the first step are, via a ring opening re- action, partially or fully sulfonated by means of sulfite ions in aqueous solution in the presence of a quarternary ammonium salt as catalyst; the polymers may be employed as thickening agents, surface coating materials. impregnating agents and bin- ders, they may also be useful as antistatic agents ion exchange resins and catalysts.
264141
Paul Swaraj
Ranby Bengt
Paul Swaraj
Ranby Bengt
Swabey Ogilvy Renault
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