Patent ID: 11891569
Assignee: MITSUBISHI CHEMICAL CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 0:
1. A diverting agent, comprising:
powdery polyvinyl alcohol-based resins having an average particle diameter of 800 to 2000 μm, wherein:
when 1 g of the polyvinyl alcohol-based resin is immersed in 100 g of water at 23° C. for an hour, the residual rate of the polyvinyl alcohol-based resin is 50 mass % or more, and
when 1 g of the polyvinyl alcohol-based resin is immersed in 100 g of water at 40° C. for seven days, the residual rate of the polyvinyl alcohol-based resin is 10 mass % or less.