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US 11,958,925 B2Granted
Process for preparation of superabsorbent polymer
AssigneeUpl Ltd
InventorsPrashant Vasant Kini, Vilas Manikant Mukadam, Janardan Ramnihor Tiwari
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Abstract
The present invention relates to a process for preparation of superabsorbent polymer with high fluid absorptivity. The present invention also relates to a composition comprising said superabsorbent polymer and their use for absorbing aqueous fluids, for example in the agricultural industry.
Claims7
A method for producing a superabsorbent polymer comprising:
- a) graft polymerizing a monomer on a polysaccharide surface in the presence of a redox catalytic system to form a copolymer;
- and,
- b) neutralizing the copolymer to obtain a granulated superabsorbent polymer;
- wherein said redox catalyst system comprises cerium (+4) salts with at least one selected from the group consisting of:
- ceric ammonium nitrate;
- ammonium persulfate;
- sodium persulfate;
- potassium persulfate;
- ferrous peroxide;
- ferrous ammonium sulfate-hydrogen peroxide;
- L-ascorbic acid, and potassium permanganate-ascorbic acid;
- wherein said monomer is at least one selected from the group of:
- acrylamide;
- methacrylamide;
- 2-acrylamido-2-methylpropanesulfonic acid;
- methacrylic acid;
- vinyl sulfonic acid;
- ethyl acrylate;
- and, potassium acrylate, and
- wherein said graft polymerization is carried out at room temperature.
17 more elements
A method of increasing water absorption capacity of a superabsorbent polymer, comprising:
- producing the superabsorbent polymer by graft polymerizing a monomer onto a starch in the presence a redox catalytic system at room temperature.
Dependencies are inferred from the claim text.