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US 10,300,458 B2Granted
Water-absorbable resin powder, and method for determining elastic modulus of water-absorbable resin powder
AssigneeNippon Shokubai Co., Ltd.
InventorsKazushi Torii, Ryosuke Fujikawa
Life of this patent
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Abstract
To provide water-absorbing resin powder particularly useful for a sanitary article, water-absorbing resin powder containing a polyacrylic acid (salt)-based water-absorbing resin as a main component is surface-crosslinked, and satisfies (1) to (3) below: (1) a proportion of a water absorbent resin powder having a particle size of not less than 150 μm and less than 850 μm is not less than 90 weight %; (2) a water absorption time according to a vortex method is not more than 42 seconds; and (3) an elastic modulus index (600-500) is not less than 5500.
Claims10
Water absorbent resin powder comprising:
- a polyacrylic acid (salt)-based water-absorbing resin as a main component,
- said water absorbent resin powder being surface-crosslinked and satisfying (1) to (3) below:
- (1) a proportion of the water absorbent resin powder having a particle size of not less than 150 μm and less than 850 μm is not less than 90 weight %;
- (2) a water absorption time according to a vortex method is not more than 42 seconds;
- and
- (3) an elastic modulus index (600-500) is not less than 5500.
3 more elements
Dependencies are inferred from the claim text.