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US 2025/0375757 A1Published application
Superabsorbent polymer and method of making the same
AssigneeFormosa Plastics Corporation
InventorsYan-Syun CIOU, Feng-Yi CHEN, Zhong-Yi CHEN
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Abstract
The present invention relates to a superabsorbent polymer and a method of making the same. The superabsorbent polymer includes a cross-linking core structure and a shell layer. The shell layer encloses the cross-linking core structure completely, and the shell layer includes microcrystalline cellulose. The superabsorbent polymer has not only good absorption properties but also excellent absorption rate as well as permeability, and can be applied to thinner hygiene products.
Claims15
A superabsorbent polymer, comprising:
- a cross-linking core structure, obtained by subjecting an aqueous solution of acid group-containing monomers, a crosslinking agent, and a polymerization initiator to a free radical polymerization step;
- and
- a shell layer, enclosing the cross-linking core structure, wherein the shell layer is formed by performing a surface-treating step on the cross-linking core structure with a surface-treating agent, the surface-treating agent comprising microcrystalline cellulose, and based on the cross-linking core structure as 100 weight percent, a usage amount of the microcrystalline cellulose is 0.1 weight percent to 5.0 weight percent.
A method of making a superabsorbent polymer, comprising:
- performing a free radical polymerization step on a superabsorbent polymer composition, so as to form a cross-linking core structure, wherein the superabsorbent polymer composition comprises:
- a aqueous solution of acid group-containing monomers;
- a crosslinking agent;
- and
- a polymerization initiator, comprising a thermal decomposition initiator and/or a redox initiator;
- and
- performing a surface-treating step on the cross-linking core structure with a surface-treating agent, so as to form a shell layer on the cross-linking core structure, wherein the shell layer encloses the cross-linking core structure completely, the surface-treating agent comprises microcrystalline cellulose, and based on the cross-linking core structure of the superabsorbent polymer is 100 weight percent, an usage amount of the microcrystalline cellulose is 0.1 weight percent to 5.0 weight percent, thereby obtaining the superabsorbent polymer.
4 more elements
Dependencies are inferred from the claim text.