Nippon Shokubai Co., Ltd.

Hidekazu Kozuki

Kazuhiro Okamura

Atsuro Yoneda

Takahiro Tsumori

Noboru Sakamoto

Kaori Nakatani

Hideo Wakami

The present invention provides an N-vinyl lactam polymer that is less likely to be colored (yellowing) even at high temperatures to maintain its color tone. The present invention provides an N-vinyl lactam polymer comprising a structural unit derived from an N-vinyl lactam monomer, the N-vinyl lactam polymer including a structural unit that has at least one of a hypophosphorous group and a group of hypophosphorous acid metal salt at a main chain terminal.

N-vinyl lactam polymer and method for producing same

To provide a continuous production method for producing a water-soluble polymer with a narrow molecular weight distribution with high efficiency. A continuous production method of a water-soluble polymer, comprising the steps of: circulating a circulation liquid containing a monomer having a polymerizable unsaturated bond through a reaction apparatus: having a tank and a circulation line comprising a piping circulating outside the tank, and thereby producing a water-soluble polymer continuously; and discharging part of the circulation liquid from a discharge line, wherein the circulation line is provided with a cooling device at least at one position.

Continuous production method of water-soluble polymer and water-soluble polymer

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Suita, Japan

Hidekazu Kozuki