Water-absorbing resin particles
Water-absorbing resin particles have a repulsion rate of 5% or more according to the formula (h 3 −h 2 )/h 1 ×100(%) when a cylinder with an inner diameter of 25.4 mm, which has a mesh-like bottom onto which 0.2 g of the water-absorbing resin particles are sprinkled, is placed in a container having ion exchange water in an amount of 30 times a mass of the water-absorbing resin particles, where h 1 represents a free swelling height (mm) of the water-absorbing resin particles after 1 minute from initiation of water absorption, h 2 represents a height (mm) of the water-absorbing resin particles after a load of 1.3×10 3 Pa is applied to the water-absorbing resin particles for 1 minute after 1 minute from initiation of the water absorption, and h 3 represents a height (mm) of the water-absorbing resin particles after 1 minute from release of the load applied when measuring h 2 .
1. Water-absorbing resin particles having a repulsion rate of 5% or more represented by Formula (1):
( h 3 −h 2 )/ h 1 ×100(%) (1)
wherein in Formula (1), when a cylinder with an inner diameter of 25.4 mm, which has a mesh-like bottom onto which 0.2 g of the water-absorbing resin particles are sprinkled, is placed in a container having ion exchange water in an amount of 30 times a mass of the water-absorbing resin particles such that the water-absorbing resin particles absorb the ion exchange water, h 1 represents a free swelling height (mm) of the water-absorbing resin particles after 1 minute from initiation of the water absorption, h 2 represents a height (mm) of the water-absorbing resin particles after a load of 1.3×10 3 Pa is applied to the water-absorbing resin particles for 1 minute after 1 minute from initiation of the water absorption, and h 3 represents a height (mm) of the water-absorbing resin particles after 1 minute from release of the load applied when measuring h 2 .
2. The water-absorbing resin particles according to claim 1 , wherein an absorption rate of physiological saline by a vortex method is 10 seconds or less.
3. The water-absorbing resin particles according to claim 1 , wherein a retention capacity of physiological saline is 15 to 39 g/g.
4. The water-absorbing resin particles according to claim 1 , wherein an absorption rate of physiological saline by a vortex method is 7 seconds or less.