Process for preparing vinylpyrrolidone polymer
AssigneeDai-Ichi Kogyo Seiyaku Co., Ltd.
InventorsAkira Kitada, Keiichi Fujise, Itsuko Hamaguchi
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Abstract
A vinylpyrrolidone polymer which is little colored, gives off a bad smell little, and contains extremely little impurities is provided. The polymerization is performed by adding a water-soluble organic peroxide and a sulfite to a vinylpyrrolidone aqueous solution.
Claims13
A process for preparing a vinylpyrrolidone polymer, wherein a water-soluble organic peroxide and a sulfite are added to a vinylpyrrolidone aqueous solution to polymerize vinylpyrrolidone, and to obtain a vinylpyrrolidone polymer, and the mole ratio of the water-solution organic peroxide and the sulfite is 1:1 to 1:10.
A vinylpyrrolidone polymer containing small amounts of vinylpyrrolidone, which is obtained by adding a water-soluble organic peroxide and a sulfite to a vinylpyrrolidone aqueous solution to polymerize vinylpyrrolidone, wherein the mole ratio of the water-soluble organic peroxide and the sulfite is 1:1 to 1:10.
Dependencies are inferred from the claim text.