Aqueous-liquid-absorbing agent and its production process
First Claim
1. An aqueous-liquid-absorbing agent containing water-absorbent resin particles as essential components, wherein the water-absorbent resin particles are obtained by a process including the step of polymerizing a water-soluble ethylenically unsaturated monomer having a carboxyl group, have a crosslinked structure in their inside, and are surface-crosslinked,the aqueous-liquid-absorbing agent being characterized by exhibiting a water absorption capacity (CRC) of 5 to 25 g/g and a saline flow conductivity (SFC) of not less than 1216 cm3·
- s·
10−
7/g.
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Accused Products
Abstract
The present invention provides an aqueous-liquid-absorbing agent which comprises water-absorbent resin particles as essential components and is suitable for uses in sanitary materials. The aqueous-liquid-absorbing agent according to the present invention is an aqueous-liquid-absorbing agent comprising water-absorbent resin particles as essential components, wherein the water-absorbent resin particles are obtained by a process including the step of polymerizing a water-soluble ethylenically unsaturated monomer having a carboxyl group, and have a crosslinked structure in their inside, the aqueous-liquid-absorbing agent exhibiting a water absorption capacity (CRC) of 5 to 25 g/g and a saline flow conductivity (SFC) of not less than 1216 cm3·s·10−7/g.
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Citations
13 Claims
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1. An aqueous-liquid-absorbing agent containing water-absorbent resin particles as essential components, wherein the water-absorbent resin particles are obtained by a process including the step of polymerizing a water-soluble ethylenically unsaturated monomer having a carboxyl group, have a crosslinked structure in their inside, and are surface-crosslinked,
the aqueous-liquid-absorbing agent being characterized by exhibiting a water absorption capacity (CRC) of 5 to 25 g/g and a saline flow conductivity (SFC) of not less than 1216 cm3· - s·
10−
7/g. - View Dependent Claims (2, 3, 4, 5, 6)
- s·
-
7. A process for production of an aqueous-liquid-absorbing agent exhibiting a water absorption capacity (CRC) of 5 to 25 g/g and a saline flow conductivity (SFC) of not less than 1216 cm3·
- s·
10−
7/g,the process comprising the steps of; (a) polymerizing a water-soluble ethylenically unsaturated monomer having a carboxyl group in an aqueous monomer solution including the water-soluble ethylenically unsaturated monomer having a carboxyl group, in the presence of an internal-crosslinking agent having at least four functional groups each capable of forming a covalent bond with a carboxyl group to thereby obtain a hydropolymer; (b) drying the hydropolymer obtained in the step (a) at a temperature of not less than 150°
C. to thereby obtain water-absorbent resin particles; and(c) surface-crosslinking the water-absorbent resin particles obtained in the step (b), wherein the amount (Y) (mol %) of the internal-crosslinking agent as used, relative to the water-soluble ethylenically unsaturated monomer having a carboxyl group, is expressed by the following equation (1);
Y≧
0.06/{2−
(2.35X/100)}
(1)where X is neutralization degree (mol %) of a carboxyl group in the water-absorbent resin particles and is in the range of 45 to 85 mol %. - View Dependent Claims (8, 9, 10, 11, 12, 13)
- s·
Specification