Patent ID: 9109059
Filing Date: 2015-08-18
Classification: C08F,Y10T

Abstract:
1. A process for preparing a superabsorbent polymer network, the process comprising: providing a mixture comprising a first monomer, a second monomer, a first crosslinker, a second crosslinker, and an initiator in a solvent at 70 to 100° C., to yield crosslinked copolymers formed of the first monomer, the second monomer, and the first crosslinker; and raising the temperature of the mixture to 100 to 150° C., to induce crosslinking between the copolymers and the second crosslinker, thereby yielding the superabsorbent polymer network, wherein the first monomer, 8 to 23 mole %, is itaconic acid, fumaric acid, itaconamic acid, maleic acid, methyl maleic acid, or a combination thereof; the second monomer, 75 to 92 mole %, is acrylic acid, 2-hydroxyethyl methacrylate, methacrylic acid, acrylamide, methacrylamide, acryloxypropionic acid, or a combination thereof; the first crosslinker, 0.1 to 1 mole %, is N,N′-methylene bisacrylamide, N,N′-ethylenebisacrylamide, 1,3-propylene bisacrylamide, ethylene diacrylate, di(ethylene glycol) diacrylate, tri(ethylene glycol) diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, or a combination thereof; and the second crosslinker, 0.2 to 1.5%, is ethylene glycol, diethylene glycol, triethylene glycol, propanediol, butanediol, pentanediol, hexanediol, methylenediamine, ethylenediamine, trimethylenediamine, or a combination thereof.