| 摘要 |
PROBLEM TO BE SOLVED: To obtain a vinylpyrrolidone-based polymer capable of controlling inhibition of an N-vinylpyrrolidone polymerization reaction by a by-product of N-vinylpyrrolidone subjected to nucleus methylation andγ-butyrolactone, having a fixed molecular weight, a slight remaining monomer, for example, capable of exhibiting excellent performances in the case of forming a water absorbing resin by crosslinking. SOLUTION: In this method for producing a vinylpyrrolidone-based polymer by polymerizing an N-vinylpyrrolidone-containing polymerizable monomer component, N-vinylpyrrolidone having <=500 ppmγ-butyrolactone content is used as the N-vinylpyrrolidone and/or N-vinylpyrrolidone obtained without using acetylene as a raw material is used as the N-vinylpyrrolidone.
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