| 摘要 |
PROBLEM TO BE SOLVED: To provide an intermediate product which is excellent in balance of a yield improving effect and a filterability improving effect and provides an additive for paper making and a method of producing an additive for paper making.SOLUTION: An acrylamide polymer contained in an intermediate product of an additive for paper making has an intrinsic viscosity of 12.5-28 dl/g and an anion conversion degree of 0.05 meq/g or smaller. In a polymerization step for preparation of the acrylamide polymer contained in the intermediate product, no crosslinking agent is added. A method of producing an additive for paper making includes a step of subjecting the intermediate product of the additive for paper making to a Hofmann degradation reaction. |
