Aggregated silica matting agent with improved efficiency

Details Aggregated silica matting agent with improved efficiency Aggregated silica matting agent with improved efficiency

C - Chemistry, Metallurgy

09

C

C09C 1/28 (2006.01) C08K 9/08 (2006.01) C09D 7/00 (2006.01) C09D 7/12 (2006.01) C12H 1/044 (2006.01) C12H 1/048 (2006.01) C12H 1/056 (2006.01)

Patent

CA 2219120

The invention relates to an aggregated silica gel which has been produced from silica gel particles having a particle size of 1 to 20 µ, a surface of 200 to 1000 m2/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.

L'invention concerne un gel de silice agrégée, produit à partir de particules de gel de silice présentant une dimension comprise entre 1 et 20 mu , une surface de l'ordre de 200 à 1000 m</g et un volume de pore spécifique se situant entre 0,4 et 2,5 ml/g, ainsi qu'un agent de fixation choisi parmi un phyllosilicate synthétique ou naturel, du dioxyde de silicium pyrogéné et des polymères organiques solubles dans l'eau ou se dispersant dans celle-ci. On effectue cette agrégation en séchant par pulvérisation une suspension comprenant 1 à 25 % de solides. Ce produit est approprié en tant qu'agent de matité destiné à des revêtements, en tant qu'agent antiadhérent destiné à des feuilles minces polymères, ainsi qu'en tant qu'agent de clarification de la bière.

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