Abstract: The invention relates to a novel process for the preparation of precipitated silica which can be used as a reinforcing filler for elastomers. The invention also relates to novel precipitated silicas in the form of powder, granules or, preferably, substantially spherical beads, these silicas being characterized in that they have a BET specific surface of between 185 and 250 m2/g, a CTAB specific surface of between 180 and 240 m2/g, and a pore distribution such that the pore volume V2 made up of the pores with a diameter of between 175 and 275 ? represents less than 50% of the pore volume V1 made up of the pores with diameters of less than or equal to 400 ?, a pore volume (Vd1), made up of the pores with a diameter of less than 1 ?m, of greater than 1.65 cm3/g, a fineness value (F.V.) of between 70 and 100 ?, and a content of fines (?f), after deagglomerability with ultrasound, of at least 50%.

Abstract: The instant invention relates to elastomeric compositions especially useful for manufacturing articles for tires which comprise: (1) at least one butadienic elastomer E, containing a functionalized butadienic elastomer prepared in solution, and modified by a polyfunctional alkoxy silane coupling agent; and (2) a specific precipitated silica having high dispersibility properties and containing aluminum, as at least one reinforcing filler in said butadienic elastomer.

Abstract: The invention relates to a novel process for the preparation of precipitated silica which can be used as a reinforcing filler for elastomers. The invention also relates to novel precipitated silicas in the form of powder, granules or, preferably, substantially spherical beads, these silicas being characterized in that they have a BET specific surface of between 185 and 250 m2/g, a CTAB specific surface of between 180 and 240 m2/g, and a pore distribution such that the pore volume V2 made up of the pores with a diameter of between 175 and 275 ? represents less than 50% of the pore volume V1 made up of the pores with diameters of less than or equal to 400 ?, a pore volume (Vd1), made up of the pores with a diameter of less than 1 ?m, of greater than 1.65 cm3/g, a fineness value (F.V.) of between 70 and 100 ?, and a content of fines (?f), after deagglomerability with ultrasound, of at least 50%.

Abstract: The instant invention relates to elastomeric compositions especially useful for manufacturing articles for tires which comprise: (1) at least one butadienic elastomer E, containing a functionalized butadienic elastomer prepared in solution, and modified by a polyfunctional alkoxy silane coupling agent; and (2) a specific precipitated silica having high dispersibility properties and containing aluminium, as at least one reinforcing filler in said butadienic elastomer.

Abstract: The invention relates to a novel process for the preparation of precipitated silica which can be used as a reinforcing filler for elastomers. The invention also relates to novel precipitated silicas in the form of powder, granules or, preferably, substantially spherical beads, these silicas being characterized in that they have a BET specific surface of between 185 and 250 m2/g, a CTAB specific surface of between 180 and 240 m2/g, and a pore distribution such that the pore volume V2 made up of the pores with a diameter of between 175 and 275 ? represents less than 50% of the pore volume V1 made up of the pores with diameters of less than or equal to 400 ?, a pore volume (Vd1), made up of the pores with a diameter of less than 1 ?m, of greater than 1.65 cm3/g, a fineness value (F.V.) of between 70 and 100 ?, and a content of fines (?f), after deagglomerability with ultrasound, of at least 50%.

Abstract: The invention relates to a novel process for the preparation of precipitated silica which can be used as a reinforcing filler for elastomers. The invention also relates to novel precipitated silicas in the form of powder, granules or, preferably, substantially spherical beads, these silicas being characterized in that they have a BET specific surface of between 185 and 250 m2/g, a CTAB specific surface of between 180 and 240 m2/g, and a pore distribution such that the pore volume V2 made up of the pores with a diameter of between 175 and 275 ? represents less than 50% of the pore volume V1 made up of the pores with diameters of less than or equal to 400 ?, a pore volume (Vd1), made up of the pores with a diameter of less than 1 ?m, of greater than 1.65 cm3/g, a fineness value (F.V.) of between 70 and 100 ?, and a content of fines (?f), after deagglomerability with ultrasound, of at least 50%.

Abstract: The invention relates to a new process for the preparation of precipitated silica which has an excellent dispersibility and very satisfactory reinforcing properties. It also relates to new precipitated silicas which are in the form of powder, of substantially spherical beads or of granules, these silicas being characterized by the fact that they have a CTAB specific surface of between 140 and 200 m2/g, a BET specific surface of between 140 and 200 m2/g, a DOP oil uptake lower than 300 ml/100 g, a median diameter, after disintegration with ultrasound, smaller than 3 &mgr;m, an ultrasonic disintegration factor higher than 10 ml and an aluminum content of at least 0.35% by weight. The invention also relates to the use of the said silicas as reinforcing fillers for elastomers.

Abstract: The invention relates to a novel process for the preparation of precipitated silica which can be used as a reinforcing filler for elastomers. The invention also relates to novel precipitated silicas in the form of powder, granules or, preferably, substantially spherical beads, these silicas being characterized in that they have a BET specific surface of between 185 and 250 m2/g,a CTAB specific surface of between 180 and 240 m2/g,and a pore distribution such that the pore volume V2 made up of the pores with a diameter of between 175 and 275 Å represents less than 50% of the pore volume V1 made up of the pores with diameters of less than or equal to 400 Å, a pore volume (Vd1), made up of the pores with a diameter of less than 1 &mgr;m, of greater than 1.65 cm3/g, a fineness value (F.V.) of between 70 and 100 Å, and a content of fines (&tgr;f), after deagglomerability with ultrasound, of at least 50%.

Abstract: The invention relates to a new process for the preparation of precipitated silica which has an excellent dispersibility and very satisfactory reinforcing properties. It also relates to new precipitated silicas which are in the form of powder, of substantially spherical beads or of granules, these silicas being characterized by the fact that they have a CTAB specific surface of between 140 and 200 m2/g, a BET specific surface of between 140 and 200 m2/g, a DOP oil uptake lower than 300 ml/100 g, a median diameter, after disintegration with ultrasound, smaller than 3 &mgr;m, an ultrasonic disintegration factor higher than 10 ml and an aluminum content of at least 0.35% by weight. The invention also relates to the use of the said silicas as reinforcing fillers for elastomers.

Abstract: The invention relates to a novel process for the preparation of precipitated silica which can be used as a reinforcing filler for elastomers. The invention also relates to novel precipitated silicas in the form of powder, granules or, preferably, substantially spherical beads, these silicas being characterized in that they have a BET specific surface of between 185 and 250 m2/g, a CTAB specific surface of between 180 and 240 m2/g, and a pore distribution such that the pore volume V2 made up of the pores with a diameter of between 175 and 275 Å represents less than 50% of the pore volume V1 made up of the pores with diameters of less than or equal to 400 Å, a pore volume (Vd1), made up of the pores with a diameter of less than 1 &mgr;m, of greater than 1.65 cm3/g, a fineness value (F.V.) of between 70 and 100 Å, and a content of fines (&tgr;f), after deagglomerability with ultrasound, of at least 50%.

Abstract: The invention relates to a new process for the preparation of precipitated silica which has a very good dispersibility and very satisfactory reinforcing properties. It also relates to new precipitated silicas which are in the form of powder, of substantially spherical beads or of granules, these silicas being characterized by the fact that they have a CTAB specific surface of between 100 and 240 m2/g, a DOP oil uptake lower than 300 ml/100 g, a pore distribution such that the pore volume consisting of the pores whose diameter is between 175 and 275 Å represents less than 50% of the pore volume consisting of the pores of diameters which are smaller than or equal to 400 Å, a median diameter, after disintegration with ultrasound, smaller than 5 &mgr;m and an aluminum content of at least 0.35% by weight. The invention also relates to the use of the said silicas as reinforcing fillers for elastomers.

Abstract: The invention relates to a new process for the preparation of precipitated silica which has a very good dispersibility and very satisfactory reinforcing properties. It also relates to new precipitated silicas which are in the form of powder, of substantially spherical beads or of granules, these silicas being characterized by the fact that they have a CTAB specific surface of between 100 and 240 m.sup.2 /g, a DOP oil uptake lower than 300 ml/100 g, a pore distribution such that the pore volume consisting of the pores whose diameter is between 175 and 275 .ANG. represents less than 50% of the pore volume consisting of the pores of diameters which are smaller than or equal to 400 .ANG., a median diameter, after disintegration with ultrasound, smaller than 5 .mu.m and an aluminium content of at least 0.35% by weight. The invention also relates to the use of the said silicas as reinforcing fillers for elastomers.

Abstract: The invention relates to a new process for the preparation of precipitated silica which has an excellent dispersibility and very satisfactory reinforcing properties. It also relates to new precipitated silicas which are in the form of powder, of substantially spherical beads or of granules, these silicas being characterized by the fact that they have a CTAB specific surface of between 140 and 200 m.sup.2 /g, a BET specific surface of between 140 and 200 m.sup.2 /g, a DOP oil uptake lower than 300 ml/100 g, a median diameter, after disintegration with ultrasound, smaller than 3 .mu.m, an ultrasonic disintegration factor higher than 10 ml and an aluminium content of at least 0.35% by weight. The invention also relates to the use of the said silicas as reinforcing fillers for elastomers.