| 摘要 |
Polymerisable compositions comprise at least one monomer containing a > C = C < group and redox catalyst systems comprising potassium permanganate and an aliphatic mono-, di-, or tricarboxylic acid containing 2 to 10 carbon atoms and having at least one hydroxyl or amino group substituted in the a -position, or a water-soluble alkali metal or ammonium salt thereof. Specified monomers are acrylic and a -substituted acrylic acids, esters, amides and nitriles, vinyl and vinylidene halides, methyl vinyl ketone, vinyl carboxylates, methylene malonic esters, itaconic acid and esters, ethylene a ,b -dicarboxylic acids, anhydrides or esters, vinyl aromatic hydrocarbons, N-vinylimides, vinyl furane, vinyl pyridines and vinyl imidazoles. Many suitable acids are listed and examples describe polymerising compositions comprising (1) acrylonitrile, vinyl acetate and citric acid, (2) acrylonitrile and tartaric acid, (3) acrylonitrile and lactic acid, (4) acrylonitrile, vinyl acetate and glycine, and (5) acrylonitrile, vinyl acetate and glycolic acid. Polymerisation may be effected in solution or in aqueous emulsion or dispersion, preferably at pH 1 to 6, in batch, semi-continuous or continuous processes. The monomers and catalyst components may be added intermittently or continuously. The products may be used in the preparation of fibres and filaments, coating and moulding compositions and lacquers.
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