Absorbent polymeric foam for shoe insoles
AssigneeEvonik Operations GmbH
InventorsSteffen Fischer, Diedrich Schmidt, Scott Smith, Xinyuan Yang
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Abstract
The present invention relates to a polymeric foam, and a process for making the polymeric foam comprising the steps of a) providing a monomeric solution consisting of a polymerizable, ethylenically unsaturated monomer containing one or more acid groups, water and one or more crosslinkers having more than one polymerizable group per molecule; b) introducing a blowing agent to the monomer solution; c) treating the monomer solution with an ultrasonic treatment; d) introducing one or more initiation agents to the monomer solution; and e) polymerizing the monomer solution.
Claims7
A process for making a polymeric foam comprising the steps of a) providing a monomeric solution consisting of an acrylic acid, it salt or solutions thereof, water and one or more crosslinkers having more than one polymerizable group per molecule;
- b) introducing a blowing agent to the monomer solution;
- c) treating the monomer solution with an ultrasonic treatment in a duration of less than 1 minute, and adding the energy to be transmitted into the monomer solution between 0.01 and 3 kJ/kg monomer solution;
- d) introducing one or more initiation agents to the monomer solution;
- e) polymerizing the monomer solution;
- f) polymerizing the monomer solution into a polymeric foam sheet;
- and g) cutting or forming the polymeric foam sheet into a shoe sole insert shape, or comminuting the polymeric foam sheet into particles.
Dependencies are inferred from the claim text.