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 2191487

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 100-240 m?2¿/g, a DOP oil absorption of less than 300 ml/100g, a pore distribution such that the pore volume consisting of pores with a diameter of 175-275 .ANG. is less than 50 % of the pore volume consisting of pores with a diameter of at most 400 .ANG., a mean diameter after ultrasonic disintegration of less than 5 µm, 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 très bonne 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 100 et 240 m2/g, une prise d'huile DOP inférieure à 300 ml/100 g, une distribution poreuse telle que le volume poreux constitué par les pores dont le diamètre est compris entre 175 et 275 .ANG. représente au moins de 50 % du volume poreux constitué par les pores de diamètres inférieurs ou égaux à 400 .ANG., un diamètre médian, après désagglomération aux ultra-sons, inférieur à 5 µm 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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