Method for Producing Water-Absorbing Polymer Particles with High Swelling Rate and High Centrifuge Retention Capacity with Simultaneously High Permeability of the Swollen Gel Bed
US-2015376318-A1 · Dec 31, 2015 · US
Methods for producing water-absorbent foamed polymer particles
US9574019B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9574019-B2 |
| Application number | US-201013509951-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 22, 2010 |
| Priority date | Nov 23, 2009 |
| Publication date | Feb 21, 2017 |
| Grant date | Feb 21, 2017 |
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- Title
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Abstract
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A process for preparing water-absorbing polymer particles, comprising polymerization of a foamed monomer solution or suspension, drying, grinding and classification.
First claim
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The invention claimed is: 1. A process for producing water-absorbing polymer particles by polymerizing a foamed aqueous monomer solution or suspension comprising a) at least one ethylenically unsaturated monomer which bears an acid group and has been neutralized to an extent of 25 to 95 mol %, b) at least one crosslinker, c) at least one initiator, and d) at least one surfactant, the monomer solution or suspension being polymerized to a polymeric foam and predried to a water content of 5 to 30%, by weight, which comprises subsequently grinding the predried polymeric foam, drying the resulting water-absorbing polymer particles, and classifying the resulting water-absorbing polymer particles. 2. The process according to claim 1 , wherein at least 50 mol % of the neutralized monomer a) are neutralized by means of an inorganic base. 3. The process according to claim 2 , wherein the inorganic base is potassium carbonate, sodium carbonate, or sodium hydroxide. 4. The process according to claim 1 , wherein the ground polymeric foam is classified to a particle size in the range from 100 to 1 000 μm. 5. The process according to claim 1 , wherein the monomer solution or suspension comprises at least 1% by weight of the crosslinker b), based on the unneutralized monomer a). 6. The process according to claim 1 , wherein the monomer a) is acrylic acid to an extent of at least 50 mol %. 7. The method of claim 1 wherein the polymeric foam is predried to a water content of 8 to 25%, by weight. 8. The method of claim 1 wherein the polymeric foam is predried to a water content of 10 to 20%, by weight.
Assignees
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Classifications
Making expandable particles · CPC title
Hydrogen, oxygen, CO2, nitrogen or noble gases · CPC title
Porous materials, e.g. foams or sponges · CPC title
Extrusion of the foamable blend · CPC title
Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title
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- What does patent US9574019B2 cover?
- A process for preparing water-absorbing polymer particles, comprising polymerization of a foamed monomer solution or suspension, drying, grinding and classification.
- Who is the assignee on this patent?
- Lopez Villanueva Francisco Javier, Linsenbühler Markus, Weismantel Matthias, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification C08F2/10. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Feb 21 2017 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).