Method for producing particulate water absorbent, and particulate water absorbent

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United States of America Patent

PATENT NO 12201962
APP PUB NO 20210387163A1
SERIAL NO

17289495

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Provided is a method for producing a particulate water-absorbing agent that can reduce a re-wet amount of an absorbent body when applied to the absorbent body. The method for producing the particulate water-absorbing agent according to an aspect of the present invention includes the step of surface-crosslinking a water-absorbing resin powder with use of a surface-crosslinking agent, wherein the water-absorbing resin powder has a specific surface area index, expressed by formula (1) below, of not less than 1.5, and the surface-crosslinking agent has an apparent Hansen solubility parameter of 22.5 MPa1/2 to 28.5 MPa1/2:

description='In-line Formulae' end='lead'(specific surface area index)=(specific surface area of water-absorbing resin powder)/(108×D502)  (1),description='In-line Formulae' end='tail'

    where:in formula (1), the unit of the specific surface area index is [1/kg], the unit of the specific surface area is [m2/kg], D50 denotes a mass average particle diameter, and the unit of D50 is [m].

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Patent Owner(s)

  • NIPPON SHOKUBAI CO LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Wada, Takaaki Himeji, JP 22 51

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