Process for producing .alpha.,.beta.-unsaturated carboxylic acid polymer
OwnerTadashi Matui, Hidetaka Tobitainventors
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Abstract
A less colored .alpha., .beta.-unsaturated carboxylic acid polymer having a relatively small molecular weigth and a sharp molecular weight distribution is produced by supplying an .alpha.,.beta.-unsaturated carboxylic acid monomer and a hydrogensulfite from one side of a reaction column and simultaneously supplying an oxygen-containing gas concurrently with the monomer to the reaction column. The polymer obtained is preferably used as a dispersant and an antiscaling agent.
Claims10
A process for producing a polymer of at least one .alpha.,.beta.-unsaturated carboxylic acid or salt thereof wherein (a) at least one monomer comprising one or more .alpha.,.beta.-unsaturated carboxylic acids or salts thereof as essential components are polymerized or copolymerized with (b) at least one other hydrophilic monomer copolymerizable with (a),
- by supplying (a), (b) and a hydrogensulfite from one side of a reaction column and
- simultaneously supplying an oxygen-containing gas concurrently with (a) and (b) to said reaction column to form a film stream of (a) and (b) on the inner wall of said reaction column by means of the gas stream of said oxygen-containing gas to effect polymerization.
Dependencies are inferred from the claim text.