MATTING AGENT BASED ON AGGREGATED SILICA

摘要

The invention relates to an aggregated silica gel which has been produced from silica gel particles having a particle size of 1 to 20 mu , a surface of 200 to 1000 m<2>/g and a specific pore volume of 0.4 to 2.5 ml/g and a binding agent selected from synthetic or natural phyllosilicate, pyrogenic silicon dioxide and organic polymers soluble in water or dispersible in water. Aggregation takes place by spray-drying a suspension having 1 to 25 % solids. The product is suitable as a matting agent for coatings, as an antiblocking agent for polymer films and as a beer clarifying agent.