Process for preparing high-molecular weight acrylamide polymer
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsTakashi Abe, Hiroshi Itoh, Manabu Tsuruta, Shoko Oyanagi, Kenichi Nakamura
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Abstract
A process for preparing an acrylamide polymer is herein disclosed which comprises the step of initiating polymerization in the presence of an oxidation-reduction system polymerization initiator comprising two or more kinds of oxidizing agents and a reducing agent. According to this process, the polymerization rate can be remarkably increased without bringing about a decrease in the molecular weight of the polymer, and hence, restriction on manufacturing facilities and apparatuses can be relieved and productivity can be remarkably enhanced, which permits a decrease in manufacturing cost.
Claims16
A process for preparing a high-molecular weight acrylamide polymer in a short period of time which comprises the step of polymerizing (meth)acrylamide or copolymerizing (meth)acrylamide and one or more unsaturated monomers copolymerizable with (meth)acrylamide in the presence of an oxidation-reduction system polymerization initiator comprising a reducing agent and two or more kinds of oxidizing agents selected from the group consisting of persulfates, hydrogen peroxide, metal peroxides, hydroperoxides, dialkyl peroxides, diacyl peroxides, ketone peroxides, dialkylperoxy dicarbonates, peracids and peracid esters, without decreasing molecular weight of the polymer.
A process for producing a flocculent which comprises a powdery high-molecular weight acrylamide polymer, said process comprising preparing the high-molecular weight acrylamide polymer in the presence of an oxidation-reduction system polymerization initiator comprising a reducing agent and two or more kinds of oxidizing agents selected from the group consisting of persulfates, hydrogen peroxide, metal peroxides, hydroperoxides, dialkyl peroxides, diacyl peroxides, ketone peroxides, dialkylperoxy dicarbonates, peracids and peracid esters, and shredding, drying, and then grinding said polymer.
Dependencies are inferred from the claim text.