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Title:
METHOD FOR PRODUCING WATER-ABSORBING RESIN PARTICLES
Document Type and Number:
WIPO Patent Application WO/2020/213298
Kind Code:
A1
Abstract:
Provided is a method for efficiently producing recycled water-absorbing resin particles from, as a raw material, discarded water-absorbing resin particles derived from used sanitary supplies, etc., the recycled water-absorbing resin particles having decreased little in absorption property and having various excellent properties. The method for producing water-absorbing resin particles of the present invention comprises a polymerization step (I) in which an aqueous gel containing a crosslinked polymer (A) of a water-soluble vinyl monomer (a1) is obtained, a gel reduction step (II) in which the aqueous gel is reduced into particles to obtain aqueous-gel particles, a step (Va) in which resin particles including the crosslinked polymer (A) and obtained from the aqueous-gel particles are mixed with a surface-crosslinking agent (d), and a reaction step (Vb) in which the surface-crosslinking agent (d) is reacted, wherein a product (B) of decomposition of water-absorbing resin particles including a crosslinked polymer (A') of a water-soluble vinyl monomer (a1') is added in at least one step selected from among the step (I), the step (II), and one or more steps to be performed after the step (II) but before the reaction step (Vb) for surface crosslinking with the surface-crosslinking agent (d).

Inventors:
MORITA EIJI (JP)
MIYAJIMA TORU (JP)
SUZUKI KAZUMITSU (JP)
Application Number:
PCT/JP2020/010234
Publication Date:
October 22, 2020
Filing Date:
March 10, 2020
Export Citation:
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Assignee:
SANYO CHEMICAL IND LTD (JP)
International Classes:
C08J3/12; C08F20/06; C08J11/10
Domestic Patent References:
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"Modern Superabsorbent Polymer Technology", 1 January 1998, article BUCHHOLZ FREDRIC L., ANDREW T. GRAHAM: "Modern Superabsorbent Polymer Technology- Passage", pages: 69 - 73,119,143,144, XP093097529
Attorney, Agent or Firm:
FURUTANI, Shinya (JP)
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