Method for producing fillers having improved bulk material stability and pourability
AssigneeAlbemarle Corporation
InventorsRene Herbiet, Mario Neuenhaus
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Abstract
Disclosed is a method for producing surface-modified fillers by spray-drying an aqueous suspension of a filler that consists of fine particles, whereby 0.1 to 50 wt. % (calculated as dry substance), preferably 0.3 up to less than 1 wt %, of an aqueous dispersion of a thermoplastic polymer or copolymer or a caoutchouc are added. Said fillers have improved bulk material stability and improved pourability. The inventive fillers are particularly suitable as flame-retardant fillers for synthetic materials or rubber, in a cable insulation for instance.
Claims15
Process for the preparation of surface modified fillers with improved bulk density stability, improved free-flowability and an average agglomerate size from 1 to 500 μm, characterized in that an aqueous suspension of filler with a primary particle size in the d50-value of not more than 15 μm with addition of 0.1 to 50 wt.-% (calculated as dry substance) of an aqueous polymer dispersion is spray-dried, which aqueous polymer dispersion consists of at least one thermoplastic polymer or copolymer and/or one rubber and optionally at least one self-crosslinking polymer or copolymer, dispersing agent and water.
Dependencies are inferred from the claim text.