Fluid-Absorbent Article
US-2017281423-A1 · Oct 5, 2017 · US
Process for producing superabsorbents
US12083496B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12083496-B2 |
| Application number | US-201917046033-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 9, 2019 |
| Priority date | Apr 20, 2018 |
| Publication date | Sep 10, 2024 |
| Grant date | Sep 10, 2024 |
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- Title
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Abstract
Official abstract text for this publication.
The invention relates to a process for producing long-term color stable superabsorbent polymer particles, comprising polymerization of a monomer solution, wherein the monomer solution comprises at least 0.01% by weight of 1-hydroxyethane-1,1-diphosphonic acid or a salt thereof and at least 0.01% by weight of 2-hydroxy-2-sulfonatoacetic acid or a salt thereof.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for producing long-term color stable superabsorbent polymer particles, comprising polymerizing a monomer solution comprising a) partly neutralized acrylic acid, b) at least one crosslinker, c) at least one initiator, d) 0.1 to 0.6% by weight of 1-hydroxyethane-1,1-diphosphonic acid or a salt thereof based on the acrylic acid prior to neutralization, and e) 0.05 to 0.5% by weight of 2-hydroxy-2-sulfonatoacetic acid or a salt thereof based on the acrylic acid prior to neutralization, drying the resulting polymer gel, optionally grinding and classifying the resulting dried polymer gel, and optionally thermally post-crosslinking and cooling the resulting polymer particles. 2. The process according to claim 1 , wherein a degree of neutralization of the partly neutralized acrylic acid is from 50 to 85 mol %. 3. The process according to claim 1 , wherein the superabsorbent polymer particles are thermally post-crosslinked. 4. The process according to claim 1 wherein the resulting polymer particles have a Hunter 60 value (HC60) after 28 days of aging at 60° C. and a relative humidity of 86% of at least 47. 5. The process according to claim 1 wherein the resulting polymer particles have a Hunter 60 value (HC60) after 28 days of aging at 60° C. and a relative humidity of 86% of at least 55.
Assignees
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Classifications
leading to a crosslinking, either explicitly or inherently · CPC title
as molar percentages · CPC title
Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title
Chemical treatments not covered by groups B01J20/3007 - B01J20/3078 · CPC title
Milling, crushing or grinding · CPC title
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- What does patent US12083496B2 cover?
- The invention relates to a process for producing long-term color stable superabsorbent polymer particles, comprising polymerization of a monomer solution, wherein the monomer solution comprises at least 0.01% by weight of 1-hydroxyethane-1,1-diphosphonic acid or a salt thereof and at least 0.01% by weight of 2-hydroxy-2-sulfonatoacetic acid or a salt thereof.
- Who is the assignee on this patent?
- Basf Se
- What technology area does this patent fall under?
- Primary CPC classification B01J20/267. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Sep 10 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).