Novel method for preparing precipitated silica, novel...

C - Chemistry – Metallurgy – 01 – B

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C01B 33/193 (2006.01) C08K 3/36 (2006.01) C09C 1/30 (2006.01)

Patent

CA 2191486

A novel method for preparing precipitated silica having a good dispersibility and highly satisfactory reinforcing properties is disclosed. Novel precipitated silicas in the form of a powder, substantially spherical beads or granules are also disclosed. Said silicas are characterised in that they have a CTAB specific surface area of 140-200 m?2¿/g, a BET specific surface area of 140-200 m?2¿/g, a DOP oil absorption of less than 300 ml/100 g, a mean diameter after ultrasonic disintegration of less than 3 µm, an ultrasonic disintegration factor of more than 10 ml, and an aluminium content of at least 0.35 wt %. Furthermore, the use of said silicas as reinforcing fillers for elastomers is disclosed.

L'invention concerne un nouveau procédé de préparation de silice précipitée ayant une excellente aptitude à la dispersion et des propriétés renforçantes très satisfaisantes. Elle est également relative à de nouvelles silices précipitées se présentant sous forme de poudre, de billes sensiblement sphériques ou de granulés, ces silices étant caractérisées par le fait qu'elles possèdent une surface spécifique CTAB comprise entre 140 et 200 m2/g, une surface spécifique BET comprise entre 140 et 200 m2/g, une prise d'huile DOP inférieure à 300 ml/100 g, un diamètre médian, après désagglomération aux ultrasons, inférieur à 3 µm, un facteur de désagglomération aux ultrasons supérieur à 10 ml et une teneur en aluminium d'au moins 0,35 % en poids. L'invention concerne aussi l'utilisation desdites silices comme charges renforçantes pour élastomères.

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