Water-absorbent resin particles having a degree of gel association of 15 or more are disclosed.

Water-absorbent resin particles 10a, in which a rate of an amount of change in a water retention amount of physiological saline when irradiation with an ultraviolet ray is performed for 3 hours with respect to a water retention amount of physiological saline before irradiation with an ultraviolet ray is more than 0% and 30% or less.

Water-absorbent resin particles having a feeding retention rate of 10% or more are disclosed, the feeding retention rate being represented by the following formula using a feeding rate through a dry powder measured by a method including the steps (A), (B), and (C) in this order, and a feeding rate through a swollen gel measured by a method including the steps (A), (B), (D), and (E) in this order.

Feeding retention rate (%)=(feeding rate through swollen gel/feeding rate through dry powder)×100

Water-absorbent resin particles 10a, in which a gel flow rate measured by the following procedures having (1) to (3) is 10 to 70 g/min: (1) mixing 1 part by mass of the water-absorbent resin particles and 199 parts by mass of water to obtain a gel, (2) accommodating the gel in a funnel in a state where a circular lower end opening with a diameter of 8 mm in the funnel is closed, and (3) measuring an outflow amount of the gel per unit time after a lapse of 3 minutes from opening of the lower end opening as the gel flow rate.

An absorber 10 containing water-absorbent resin particles 10a, in which a rate of an amount of change in a water retention amount of physiological saline of the water-absorbent resin particles 10a when the water-absorbent resin particles 10a are irradiated with an ultraviolet ray for 3 hours with respect to a water retention amount of the water-absorbent resin particles 10a of physiological saline before irradiation with an ultraviolet ray is more than 0% and 30% or less.

The present invention relates to a super absorbent polymer. The super absorbent polymer contains polymer particles formed of large pores in a certain amount or more, and thus can exhibit large surface area and excellent initial absorption capacity. Therefore, when the super absorbent polymer is used, it can provide a sanitary material such as a diaper or a sanitary napkin which can quickly absorb body fluids and impart a dry and soft touch feeling.

Disclosed are water-absorbent resin particles having a gel outflow test force measured by the following method of 5 to 14 N. The measuring method for gel outflow test force includes: producing a swollen gel by allowing the water-absorbent resin particles to absorb 29 times as amount of physiological saline as the water-absorbent resin particles under stirring; evenly putting 20 g of the swollen gel in a cylinder with an inner diameter of 5 cm and having a hole with a diameter of 5 mm at a bottom part, compressing the swollen gel in the cylinder at a rate of 10 mm/min with a jig with a diameter of 4.9 cm, thereby recording a test force at a time point when a part of the swollen gel flows out from the hole at the bottom part of the cylinder, as the gel outflow test force.

Water-absorbent resin particles 10a having a gel surface elasticity measured by the following (1) to (5) is 0.35 to 2.00 N: (1) preparing a gel of the water-absorbent resin particles, (2) bringing a jig into contact with the gel, (3) performing an operation of pressing the jig into the gel and thereafter pulling the jig back to obtain a maximum value and a minimum value of loads applied to the jig during the operation, (4) repeating twice an operation of pressing the jig into the gel and thereafter pulling the jig back to obtain a maximum value and a minimum value of loads applied to the jig during each of operations, and (5) obtaining an average value of maximum values obtained in (3) and (4) and an average value of minimum values obtained in (3) and (4) to obtain a difference between these values as the gel surface elasticity.

Disclosed is an absorbent article 100 including an absorber 10 containing water-absorbent resin particles 10a, in which the water-absorbent resin particles 10a have a maximum gel resistance measured by procedures (1) to (3) of 0.3 to 1.5 N, and a water absorption amount for physiological saline under a load of 4.14 kPa of 12 mL/g or more.

The present disclosure relates to a super absorbent polymer composition. More specifically, the present disclosure relates to a super absorbent polymer composition prepared such that agglomeration between polymer particles is suppressed by including an additive having a specific structure, and thus an additional pulverizing process is not required after drying.