Patent ID: 8822582
Filing Date: 2014-09-02
Classification: A61L,C08J

Abstract:
1. A high-capacity superabsorbent polymer composition comprising a superabsorbent polymer comprising: a) from about 55% to about 99.9% by weight of polymerizable unsaturated acid group containing monomer, based on the superabsorbent polymer; and b) from about 0.001% to about 5% by weight of internal crosslinking agent based on the polymerizable unsaturated acid group containing monomer; wherein the superabsorbent polymer has a degree of neutralization of greater than about 25%; wherein elements a) and b) are polymerized and prepared into superabsorbent polymer particles and further comprising the following surface additives to form surface treated superabsorbent polymer particles treated with i) from about 0.01 to about 2% by weight of an inorganic metal compound, wherein said inorganic metal compound is selected from calcium phosphate, aluminum phosphate, or iron phosphate, based on the dry superabsorbent polymer composition, and ii) from about 0.01% to about 0.5% by weight of cationic polymer based on the superabsorbent polymer composition and iii) from about 0.01% to about 0.5% of a thermoplastic polymer that is selected from polyolefin, polyethylene, linear low density polyethylene, ethylene acrylic acid copolymer, styrene copolymers, ethylene alkyl methacrylate copolymer, polypropylene, maleated polypropylene, ethylene vinyl acetate copolymer, polyamide, polyester, blends thereof, or copolymers thereof wherein the superabsorbent polymer composition exhibits a free swell gel bed permeability of from 10 Darcy to about 47 Darcy as measured by the Free Swell Gel Bed Permeability Test.