Patent ID: 6946505

Claim:
A cement dispersant, comprising a water-soluble polymer (P) as a main component and displaying an area proportion in the range of 13 to 60% wherein the area proportion is defined by a measurement process including the following steps (1) to (9) of: (1) measuring a weight-average molecular weight of the water-soluble polymer (P) by gel permeation chromatography (GPC); (2) detecting a height (H) of the top peak of the resultant GPC chart; (3) representing a value of a weight-average molecular weight indicating a height (½H) of ½ of the height of the top peak on the higher molecular weight side of the top peak by M A ; (4) measuring an area (A 0 ) of a higher molecular weight side portion than the weight-average molecular weight M A of the resultant GPC chart; (5) representing a value of a weight-average molecular weight indicating a height (½H) of ½ of the height of the top peak on the lower molecular weight side of the top peak by M g ; (6) measuring an area (B 0 ) of a lower molecular weight side portion than the weight-average molecular weight M B of the resultant GPC chart; (7) defining an area ratio A of the higher molecular weight side portion as A=A 0 ×100)/(A 0 +B 0 ); (8) defining an area ratio B of the lower molecular weight side portion as B=B 0 ×100)/(A 0 +B 0 ); and (9) defining a value (A−B), given by subtracting the area ratio B of the lower molecular weight side portion from the area ratio A of the higher molecular weight side portion, as the area proportion (%).