Verfahren zur Herstellung Wasserabsorbierender Harzpartikel, Wasserabsorbierende Harzpartikel, Absorber und Saugfähiger Artikel

Details

Veröffentlichungs-Nr.

EP4737507

Anmeldetag

20. Juni 2024

Veröffentlichung

2. Januar 2025

Rechtsraum

EP

IPC

C08J3/12, A61F13/15, A61F13/53

Abstract

There is provided a novel method for producing water-absorbent resin particles having gel stability against artificial urine containing iron, long-term gel stability against artificial urine, and yellowing resistance. A method for producing water-absorbent resin particles, comprising the steps of polymerizing a water-soluble ethylenically unsaturated monomer to obtain polymer particles; and subjecting the polymer particles to surface-crosslinking, wherein before and/or after the step of surface-crosslinking, a phosphonic acid-based chelating agent is added to the polymer particles having a water content of 5% by mass or more and 100% by mass or less, and wherein an amount of the phosphonic acid-based chelating agent added is 0.055 parts by mass or more and 0.6 parts by mass or less per 100 parts by mass of the water-soluble ethylenically unsaturated monomer.

Anmelder

Firma

Sumitomo Seika Chemicals Co., Ltd.

Land

🇯🇵 Japan