Matting agent based on aggregated silica
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United States of America Patent
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Aug 15, 2000
Grant Date -
N/A
app pub date -
Apr 6, 1998
filing date -
Apr 26, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.sup.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.
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