Patent ID: 6743391
Filing Date: 2004-06-01
Classification: A61L,Y10T

Abstract:
A method for making a delayed absorption, particulate superabsorbent polymer, said method comprising:(a) preparing a particulate superabsorbent polymer, and (b) subjecting the particulate superabsorbent of step (a) to a thermal profile having a first part and a second part, wherein the first part comprises heating the superabsorbent polymer with an increasing temperature from a beginning temperature to a final increased temperature and the second part comprises maintaining heating of the superabsorbent polymer at a constant temperature that is at least about 5Â° C. higher than the final increased temperature of the first part, and wherein the temperatures and the times for heating of each of the first part and the second part are sufficient to achieve a delayed absorption, particulate superabsorbent polymer having a free water absorption property of absorbing less than about 3 grams of aqueous saline per gram of superabsorbent polymer in about 6 seconds, for a full particle size distribution ranging from about 40 micrometers to about 890 micrometers.