Precipitated silica

Details Precipitated silica Precipitated silica

C - Chemistry, Metallurgy

01

B

C01B 33/193 (2006.01) C08K 3/36 (2006.01) C08K 9/04 (2006.01)

Patent

CA 2150368

Novel silicas in the form of powder and spherical beads or granules. The silicas are characterized by having a specific CTAB surface of 100-140 m?2¿/g, a small median diameter, following disaggregation by ultrasound means, and, optionally, a porous distribution so that the porous volume occupied by the pores whose diameter is 175-275 .ANG. is less than 55 % of the porous volume occupied by the pores having diameters of 400 .ANG. or less. The invention also concerns a method for the preparation of said silicas and their use as reinforcing fillers for elastomers.

L'invention concerne de nouvelles silices se présentant sous forme de poudre, de billes sensiblement sphériques ou de granulés, ces silices étant caractérisées en ce qu'elles présentent une surface spécifique CTAB comprise entre 100 et 140 m2/g, un diamètre médian, après désagglomération aux ultra- sons, faible et, éventuellement, une distribution poreuse telle que le volume poreux constitué par les pores dont le diamètre est compris entre 175 et 275 .ANG. représente moins de 55 % du volume poreux constitué par les pores de diamètres inférieurs ou égaux à 400 .ANG.. Elle concerne également un procédé de préparation desdites silices et aussi leur utilisation comme charges renforçantes pour élastomères.

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