AGGREGATED SILICA MATTING AGENT WITH IMPROVED EFFICIENCY

摘要

The invention relates to an aggregated silica gel which has been produced fromsilica gel particles having a particle size of 1 to 20µ, a surface of 200 to 1000 m2/g and a specific pore volume of 0.4 to 2.5ml/g and a binding agent selected from synthetic or naturalphyllosilicate, pyrogenic silicon dioxide and organic polymers soluble inwater or dispersible in water. Aggregation takes place byspray--drying a suspension having 1 to 25 % solids. The product is suitable asa matting agent for coatings, as an antiblocking agent for polymerfilms and as a beer clarifying agent.