| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for stably obtaining polymer fine particles even if an excessive amount of emulsifier is not used in a reversed phase suspension polymerization of an aqueous N-vinylcarboxylic acid amide solution. <P>SOLUTION: In the manufacturing method for N-vinylcarboxylic acid amide based polymer, a monomer aqueous solution containing N-vinylcarboxylic acid amide represented by the formula: CH<SB POS="POST">2</SB>=CHNHCOR (wherein R represents a hydrogen atom or a 1-6C alkyl group) is added dropwise into a dispersion medium containing a hydrocarbon based solvent and an emulsifier, and the suspension polymerization is performed in a water-in-oil system. 70 mass% or more of a dispersing agent of a predetermined use amount is successively added into the dispersion medium simultaneously with addition of the monomer aqueous solution. <P>COPYRIGHT: (C)2012,JPO&INPIT |
