C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
117/201, 400/906
C08F 8/12 (2006.01) D06M 15/233 (2006.01) D06M 15/31 (2006.01)
Patent
CA 1309208
Process for the preparation of water-soluble copolymers, and the use thereof as sizing agents A b s t r a c t Process for the preparation of aqueous solutions of hydrolysed styrene/acrylonitrile copolymers, the carboxyl groups of which are entirely or partly present as NH4 and/or alkali metal salt, characterized in that a) 40-90% by weight of acrylonitrile, b) 10-60% by weight of styrene and c) 0-20% by weight of further monomer which can be hydro- lysed by alkali are subjected to suspension or emulsion polymerization, the aqueous dispersion or emulsion is subsequently hydro- lysed at 90-220°C in the presence of alkali metals and/ or alkaline earth metals, and, if appropriate, the co- polymer solution is treated with hydrogen peroxide wherein a part of the styrene may be replaced by a further monomer which cannot be hydrolysed by alkali.
539284
Hoppe Lutz
Huhn Helmut
Karstens Werner
Reinhardt Eugen
Fetherstonhaugh & Co.
Hoppe Lutz
Huhn Helmut
Karstens Werner
Reinhardt Eugen
LandOfFree
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