Patent ID: 11898090
Assignee: MITSUBISHI CHEMICAL CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 1:
2. The diverting agent according to claim 1,
wherein when 24 g of the diverting agent is added to 400 mL of a 0.60 mass % aqueous solution of guar gum and dispersed at 23° C. for 60 minutes to obtain a dispersion liquid having a diverting agent concentration of 6 mass %, the dispersion liquid is subjected to pressure dehydration at pressure of 0.4 MPa using a pressure dehydration device including a drainage portion having a slit having a width of 2 mm, an cumulative dehydration amount y with respect to a square root x of a time is obtained, and a regression line represented by the following formula (A) is calculated by a least-squares method from a scatter diagram plotted on a graph in which the square root x of the time is plotted on a horizontal axis and the cumulative dehydration amount y is plotted on a vertical axis, a water permeability coefficient represented by the slope a of the following formula (A) is in a range of 0.0 to 4.0,

y=ax+b  (A)

in the formula (A), y is a cumulative dehydration amount (gram), x is the square root of the time (minutes) elapsed from start of pressurization, a and b are the slope and an intercept of the regression line, and 0<x≤2.