Porous, powdery polypropylene
AssigneeAkzo N.V.
InventorsWalter Fickel, Gerhard Ries
Life of this patent
Estimating the term…
Abstract
Porous, powdery polypropylene is disclosed, obtained by providing a hot solution of polypropylene in pentaerythrol ester as solvent, slowly cooling said solution down to approximately room temperature to provide a solidified mass with or without affecting mechanical size reduction of said solidified mass, and extracting said solidified mass with an extractant in which pentaerythrol is soluble, with or without subsequently removing said solvent to a high degree.
Claims12
Porous, powdery polypropylene having an apparent density of 0.1 to 0.3 g/cm.sup.3, a particle size of 5-700 .mu.m, and an external porosity of 70-85% obtained by providing a hot solution of polypropylene in pentaerythrol ester as solvent, slowly cooling said solution down to approximately room temperature to provide a solidified mass with or without affecting mechanical size reduction of said solidified mass, and extracting said solidified mass with an extractant in which pentaeryhtrol is soluble, with or without subsequently removing said solvent to a high degree.
Dependencies are inferred from the claim text.