Process for preparing high-purity vinylpyrrolidone polymer
AssigneeDai-Ichi Kogyo Seiyaku Co., Ltd.
InventorsAkira Kitada, Keiichi Fujise, Itsuko Hamaguchi
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Abstract
A process for preparing a high purity vinylpyrrolidone polymer which dissolves clearly in an organic solvent can be provided. The process for preparing a high purity vinylpyrrolidone polymer, wherein vinylpyrrolidone is polymerized by using a redox initiator comprising an organic peroxide and a sulfite, and thereafter the product is contacted with an anion exchange resin to be purified.
Claims8
A process for preparing a high purity vinylpyrrolidone polymer, which is characterized in polymerizing vinylpyrrolidone by using a redox initiator comprising an organic peroxide and a sulfite, and thereafter contacting the product with an anion exchange resin.
A high purity vinylpyrrolidone polymer containing a small amount of sulfate ion and sulfite ion, which is obtained by polymerizing vinylpyrrolidone using a redox initiator which contains an organic peroxide and a sulfite, and thereafter contacting the product with an anion exchange resin.
Dependencies are inferred from the claim text.