Water-absorbent resin particles
AssigneeSumitomo Seika Chemicals Co., Ltd.
InventorShiho OKAZAWA
Life of this patent
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Abstract
Water-absorbent resin particles having a gel brightness L* of 8 to 60 measured by a method including the following steps (A), (B), and (C) in this order are disclosed. (A) 0.1 g of water-absorbent resin particles are uniformly scattered in a colorless and transparent round cell for a color-difference meter having an inner diameter of 30 mm. (B) 5.0 g of ion-exchanged water is added to the round cell to cause the water-absorbent resin particles to absorb water. (C) a brightness L* of an obtained gel is measured on a black background after five minutes from the addition of the ion-exchanged water.
Claims8
Water-absorbent resin particles having a gel brightness L* of 8 to 60 measured by a method including the following steps (A), (B), and (C) in this order,
- (A) uniformly scattering 0.1 g of water-absorbent resin particles in a colorless and transparent round cell for a color-difference meter, the round cell having an inner diameter of 30 mm,
- (B) adding 5.0 g of ion-exchanged water to the round cell to cause the water-absorbent resin particles to absorb water, and
- (C) measuring a brightness L* of an obtained gel on a black background after five minutes from the addition of the ion-exchanged water.
A method for producing water-absorbent resin particles, the method comprising
- selecting water-absorbent resin particles having a gel brightness L* measured of 8 to 60 by a method including the following steps (A), (B), and (C) in this order,
- (A) uniformly scattering 0.1 g of water-absorbent resin particles in a colorless and transparent round cell for a color-difference meter, the round cell having an inner diameter of 30 mm,
- (B) adding 5.0 g of ion-exchanged water to the round cell to cause the water-absorbent resin particles to absorb water, and
- (C) measuring a brightness L* of an obtained gel on a black background after five minutes from the addition of the ion-exchanged water.
A method for improving an absorption amount of an absorber containing water-absorbent resin particles, the method comprising
- adjusting a gel brightness L* of the water-absorbent resin particles measured by a method including the following steps (A), (B), and (C) in this order,
- (A) uniformly scattering 0.1 g of water-absorbent resin particles in a colorless and transparent round cell for a color-difference meter, the round cell having an inner diameter of 30 mm,
- (B) adding 5.0 g of ion-exchanged water to the round cell to cause the water-absorbent resin particles to absorb water, and
- (C) measuring a brightness L* of an obtained gel on a black background after five minutes from the addition of the ion-exchanged water.
Dependencies are inferred from the claim text.