Matting agent based on aggregated silica

US6103004A · kind A · utility

Assignee

• Grace GmbH · DE

Inventors

• Peter Belligoi · Worms, DE
• Rex J. Field · Arcola, US
• Georg Luers · Westhofen, DE
• Rita Schneider · Worms, DE

Key dates

• Filing date: Apr 6, 1998
• Grant date: Aug 15, 2000
• Expiry date: Apr 6, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C12H1/0408
• WIPO field: Food chemistry
• WIPO sector: Chemistry

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.