| abstract |
PROBLEM TO BE SOLVED: To provide a water-soluble resin having a high molecular weight, a narrow molecular weight distribution, and low generation of a low molecular weight product. SOLUTION: This is a water-soluble resin containing one or more vinyl monomers (a) which become water-soluble and / or water-soluble by hydrolysis as a main component, and satisfy the following requirements or the following. When the peak top molecular weight of the molecular weight measurement chart by the GPC method of (A) is M, the content of a low molecular weight substance of M × 0.2 or less and a high molecular weight substance of M × 2.0 or more is G 2% or less and 5% on PC chart area The thread length / intrinsic viscosity is 4 or less |