Superabsorbent polymer having a capacity increase

A particulate superabsorbent polymer composition comprising a superabsorbent polymer comprising:

• a) at least one monomer selected from an ethylenically unsaturated carboxylic acid, ethylenically unsaturated carboxylic acid anhydride, salts or derivatives thereof based on the superabsorbent polymer;
• b) from about 0.001% by weight to about 5% by weight of a first internal crosslinking agent and second internal crosslinking agent, based on the monomer of a) wherein the first internal crosslinking agent comprises a silane compound comprising at least one vinyl group or allyl group and at least one Si—O bond wherein the vinyl group or allyl group is directly attached to a silicon atom;
• and
• c) a salt forming cation wherein the superabsorbent polymer has a degree of neutralization of greater than about 25%;
• wherein elements a), b) and c) are polymerized into a crosslinked hydrogel, which is then prepared into superabsorbent polymer particles;
• and the particulate superabsorbent polymer composition further comprises a surface coating comprising ethylene carbonate, aluminum sulfate and maleated polypropylene, wherein said particulate superabsorbent polymer composition has a Centrifuge Retention Capacity of from 25 g/g to about 55 g/g as set forth herein in the Centrifuge Retention Capacity Test and having a Vortex time of from about 20 to about 180 sec.

A particulate superabsorbent polymer composition comprising a superabsorbent polymer comprising:

• a) at least one monomer selected from an ethylenically unsaturated carboxylic acid, ethylenically unsaturated carboxylic acid anhydride, salts or derivatives thereof based on the superabsorbent polymer;
• b) from about 0.001% by weight to about 5% by weight of a first internal crosslinking agent and second internal crosslinking agent, based on the monomer of a) wherein the first internal crosslinking agent comprises a silane compound comprising at least one vinyl group or allyl group and at least one Si—O bond wherein the vinyl group or allyl group is directly attached to a silicon atom;
• and
• c) a salt forming cation wherein the superabsorbent polymer has a degree of neutralization of greater than about 25%;
• wherein elements a), b) and c) are polymerized into a crosslinked hydrogel, which is then prepared into superabsorbent polymer particles;
• and the particulate superabsorbent polymer composition further comprises a surface coating comprising ethylene carbonate, aluminum sulfate and maleated polypropylene, wherein said particulate superabsorbent polymer composition has a Centrifuge Retention Capacity of from 25 g/g to about 55 g/g as set forth herein in the Centrifuge Retention Capacity Test and having a Vortex time of from about 20 to about 180 sec.