Patent ID: 7893134
Filing Date: 2011-02-22
Classification: A61L,B29B,C08F,Y10T

Abstract:
1. An absorbent polymer obtainable by a process for producing an absorbent polymer comprising the steps of: a first mixing event, wherein a plurality of absorbent polymer particles are mixed with a liquid in a mixer; and a second mixing event, wherein the liquid is distributed within the polymer particles; wherein the polymer particles in the first mixing event are mixed with a first mixing speed, and the polymer particles in the second mixing event are stirred with a lower speed than in the first mixing event; and wherein the first mixing event is a continuous mixing process wherein in the first mixing event the polymer particles are back-mixed in such a way that a flow of the new polymer particles entering in the mixer is overlaid by a flow of polymer particles already present in the mixer and opposed to this flow wherein the ratio of the opposed flow to the flow of newly entering polymer particles averages about 5 to about 50% by wt.