US 9,517,289 B2Granted

Water-absorbing agent and method for producing the same

AssigneeNippon Shokubai Co., Ltd.

InventorsShigeru Sakamoto, Hiroyuki Ikeuchi, Sayaka Machida

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Abstract

The present invention provides a water-absorbing agent that includes water-absorbent resin particles as essential components and is suitable for a sanitary material. A water-absorbing agent of the present invention includes water-absorbent resin particles obtained by polymerizing an unsaturated monomer having an acid group. The water-absorbing agent has centrifuge retention capacity (CRC) of 5 to 20 g/g and includes: a compound with a structure unit derived from polyalkyleneglycol other than the unsaturated monomer; and a multivalent metal salt, and accordingly the water-absorbing agent has high saline flow conductivity (SFC) in a range of the above centrifuge retention capacity (CRC).

Claims5

Dependent claims

A water-absorbing agent, comprising water-absorbent resin particles obtained by polymerizing an acid group-containing unsaturated monomer,

the water-absorbing agent having Centrifuge Retention Capacity (CRC) ranging from 5 to 20 g/g, and including (i) a compound that includes a constitutional unit derived from polyalkyleneglycol and that is other than an unsaturated monomer, said compound having a weight-average molecular weight ranging from 1000 to 6000 and (ii) polyvalent metal salt, and
the compound including no radical polymerizable group, and being free without forming a chemical bond with the water-absorbent resin particles or being separable from the water-absorbent resin particles and without forming an internal crosslinked structure in the water-absorbent resin particles,
the compound included in the water-absorbing agent falling within a range of 0.05 to 5 mass % with respect to the water-absorbing agent.

Dependencies are inferred from the claim text.

Facts

Application: 12/680,740Filed 26 Nov 2008
Priority: JP 2007-32122712 Dec 2007
Published: US 2010/0240823 A123 Sep 2010
Granted: 13 Dec 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

A61L 15/60
Use of materials characterised by their function or physical properties: liquid-swellable gel-forming materials, e.g. super-absorbents
C08G 65/3322
Containing carboxyl groups, or halides, or esters thereof: acyclic
C08J 3/12
Processes of treating or compounding macromolecular substances: powdering or granulating
C08L 71/02
Compositions of polyethers obtained by reactions forming an ether link in the main chain ; Compositions of derivatives of such polymers:…

Family

US 2010/0240823 A1Pre-grant publication · published 23 Sep 2010
US 9,517,289 B2This patent

From the US filing history. Foreign family members aren’t listed.

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