Method for producing acrylamide polymers
AssigneesKyoritsu Yuki Co., Ltd., Mitsubishi Chemical Industries Limited
InventorsKatsutoshi Tanaka, Kazuo Ikeda
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Abstract
Concentrated aqueous solution of acrylamide or mixture of acrylamide and other vinyl monomer is polymerized in the presence of catalyst, and the polymerization solution is to be boiled by heat of polymerization in the course of polymerization. Obtained hydrous gels of acrylamide polymers are porous, water soluble and are easily dehydrated by conventional dehydration techniques.
Claims5
A method for producing water soluble acrylamide polymers which comprises polymerizing an aqueous solution of acrylamide or mixture of acrylamide and up to 50 mol % based on the total monomer of copolymerizable vinyl monomer in a concentration of 30 to 70% by weight in the presence of polymerization initiator, wherein the heat of polymerization itself causes the polymerization mixture to boil for a brief period during the course of polymerization and wherein said polymerization is initiated at about room temperature, boiling commences from 5 to 20 minutes after initiation and lasts for from 1 to 5 minutes, and the distance from the bottom of the polymerization vessel to the surface of the reaction mixture does not exceed about 500 mm.
Dependencies are inferred from the claim text.