Patent ID: 8598405

Claim:
A method of solidifying a medical waste solution, which is a method of treating a medical waste solution containing blood or body fluid comprising placing a treating agent into a medical waste solution containing blood or body fluid in an effective amount to solidify the medical waste solution into a gel, wherein the treating agent is a particulate waste solution solidifying agent, said waste solution solidifying agent comprising, as an essential component, a water-absorbent resin having a crosslinked structure obtained by polymerizing a monomer containing acrylic acid and/or a salt thereof as a main component, and further comprising a non-volatile hydrophobic substance powder having a methanol index of 20 or more, wherein when placed in a 0.90 mass % aqueous sodium chloride solution at once, 20 to 95 mass % of the agent is floated, and 80 to 5 mass % of the agent is settled, provided that floating and settling are defined by the state at one minute after placement of 40 g of a particulate waste solution solidifying agent at once in a measuring cylinder having an effective volume of 1000 ml (inner diameter 66 mm) which has a vertical axial direction and contains 1000 ml of a 0.90 mass % aqueous sodium chloride solution at 25° C., and the hydrophobic substance being a powder where 90 to 100 mass % of the powder has a particle diameter of 200 μm or smaller, and the amount of the hydrophobic substance powder is 0.001 to 10 mass % relative to the total amount of the water-absorbent resin particles, and wherein Methanol Index: when 1 g of a hydrophobic substance is added to 50 ml of pure water at 25° C., in the case where the hydrophobic substance is a solid, a volume (ml) of methanol at 25° C. necessary for wetting, or in the case where the hydrophobic substance is a liquid, a volume (ml) of methanol at 25° C. necessary for dispersing and/or emulsifying the hydrophobic substance.