Abstract: Precipitated silicas and wax-coated precipitated silicas, their preparation, and their use as matting agents in inks and paints, the precipitated silicas characterized by: BET 350-550 m2/g DBP number 320-400 g/100 g d50 5-15 ?m, and tamped density 20-90 g/l.

Abstract: Precipitated silica or silicates, obtainable by acid precipitation of aqueous silicate solutions while maintaining a constant alkali number of at least 1.

Abstract: Highly efficient matting agents based on precipitated silicas and wax-coated precipitated silicas, their preparation, and their use in inks and paints.

Abstract: Highly efficient matting agents based on precipitated silicas and wax-coated precipitated silicas, their preparation, and their use in inks and paints.

Abstract: A precipitated silica characterized by BET 350-550 m2/g DBP number 350-400 g/100 g d50 5-15 ?m, and tamped density 20 to less than 70 g/l.

Abstract: A precipitated silica with the following physiochemical properties: BET surface area 35 m2/g to 350 m2/g BET/CTAB surface area ratio 0.8 to 1.1 Pore volume, PV 1.6 ml/g to 3.4 ml/g Silanol group density (V2 = NaOH 3 ml/(1.5 g) to 9.5 ml/(1.5 g) consumption) Average aggregate size 250 nm to 1500 nm CTAB surface area 30 m2/g to 350 m2/g DBP value 150 ml/100 g to 300 ml/100 g V2/V1 by Hg porosimetry 0.19 to 0.46 DBP/CTAB 1.2 to 3.5 is produced by reacting alkali silicate with mineral acids at temperatures of 60° C. to 95° C. while maintaining a pH of 7.5 to 10.5 and continuously stirring, continuing the reaction to a solids concentration in the precipitation suspension of 90 g/l to 120 g/l, adjusting the pH value to a value of less than or equal to 5, filtering out, washing, drying and optionally grinding or granulating the precipitated silica. The precipitated silica is used as a filler in vulcanizable rubber compounds and vulcanizates.

Abstract: A precipitated silica having the following physico-chemical characteristics: pH (5% in water) (ISO 787-9) 3–8 BET surface area (DIN 66131) (m2/g) 400–600 DBP absorption value (DIN 53601, (g/100 g) 380–420 in relation to dried substance) Tapped density (ISO 787-11) (g/l) 100–200 ALPINE sieve residue > 63? (ISO 8130-1) (%) 0.1–40.

Abstract: Precipitated silica or silicates, obtainable by acid precipitation of aqueous silicate solutions while maintaining a constant alkali number of at least 1.

Abstract: Rubber compositions comprising a precipitated silica with the following physico-chemical properties: BET surface area ??35 to 350 m2/g BET/CTAB surface area ratio ?0.8 to 1.1 Pore volume, PV ?1.6 to 3.4 ml/g Silanol group density ??6 to 20 ml/(5 g) Average aggregate size ?250 to 1500 nm CTAB surface area ??30 to 350 m2/g DBP value ?150 to 300 ml/100 g V2/V1 by Hg porosimetry 0.19 to 0.46 DBP/CTAB ?1.2 to 3.5.

Abstract: A precipitated silica with the following physicochemical properties: BET surface area 35 m2/g to 350 m2/g BET/CTAB surface area ratio 0.8 to 1.1 Pore volume, PV 1.6 ml/g to 3.4 ml/g Silanol group density 3 ml/(1.5 g) to 9.5 ml/(1.5 g) (V2 = NaOH consumption) Average aggregate size 250 nm to 1500 nm CTAB surface area 30 m2/g to 350 m2/g DBP value 150 ml/100 g to 300 ml/100 g V2/V1 by Hg porosimetry 0.19 to 0.46 DBP/CTAB 1.2 to 3.5 is produced by reacting alkali silicate with mineral acids at temperatures of 60° C. to 95° C. while maintaining a pH of 7.5 to 10.5 and continuously stirring, continuing the reaction to a solids concentration in the precipitation suspension of 90 g/l to 120 g/l, adjusting the pH value to a value of less than or equal to 5, filtering out, washing, drying and optionally grinding or granulating the precipitated silica. The precipitated silica is used as a filler in vulcanizable rubber compounds and vulcanizates.

Abstract: A precipitated silica with the following physicochemical properties: BET surface area 35 m2/g to 350 m2/g BET/CTAB surface area ratio 0.8 to 1.1 Pore volume, PV 1.6 ml/g to 3.4 ml/g Silanol group density 3 ml/(1.5 g) to 9.5 ml/(1.5 g) (V2 = NaOH consumption) Average aggregate size 250 nm to 1500 nm CTAB surface area 30 m2/g to 350 m2/g DBP value 150 ml/100 g to 300 ml/100 g V2/V1 by Hg porosimetry 0.19 to 0.46 DBP/CTAB 1.2 to 3.5 is produced by reacting alkali silicate with mineral acids at temperatures of 60° C. to 95° C. while maintaining a pH of 7.5 to 10.5 and continuously stirring, continuing the reaction to a solids concentration in the precipitation suspension of 90 g/l to 120 g/l, adjusting the pH value to a value of less than or equal to 5, filtering out, washing, drying and optionally grinding or granulating the precipitated silica. The precipitated silica is used as a filler in vulcanizable rubber compounds and vulcanizates.

Abstract: Precipitated silica or silicates, obtainable by acid precipitation of aqueous silicate solutions while maintaining a constant alkali number of at least 1.

Abstract: Highly efficient matting agents based on precipitated silicas and wax-coated precipitated silicas, their preparation, and their use in inks and paints.

Abstract: Precipitated silica or silicates, obtainable by acid precipitation of aqueous silicate solutions while maintaining a constant alkali number of at least 1.

Abstract: Rubber compositions comprising a precipitated silica with the following physicochemical properties: 1 BET surface area   35 to 350 m2/g BET/CTAB surface area ratio  0.8 to 1.1 Pore volume, PV  1.6 to 3.4 ml/g Silanol group density (V2 =   6 to 20 ml NaOH consumption) Average aggregate size  250 to 1500 nm CTAB surface area   30 to 350 m2/g DBP value  150 to 300 ml/100 g V2/V1 by Hg porosimetry 0.19 to 0.46 DBP/CTAB  1.2 to 3.5.

Abstract: A precipitated silica having the following physico-chemical characteristics: 1 pH (5% in water) (ISO 787-9) 3-8 BET surface area (DIN 66131) (m2/g) 400-600 DBP absorption value (DIN 53601, (g/100 g) 380-420 in relation to dried substance) Tapped density (ISO 787-11) (g/l) 100-200 ALPINE sieve residue > 63&mgr; (ISO 8130-1) (%) 0.

Abstract: A precipitated silica which contains an active substance with a characteristic, delayed release of active substance is prepared by adding the active substance during preparation of the precipitated silica. The precipitated silica containing the active substance may be added to oral hygiene agents such as toothpastes, topical fluoride preparations, dental materials or medicinal chewing gums.

Abstract: A precipitated silica with the following physicochemical properties:______________________________________ BET surface area 35 to 350 m.sup.2 /g BET/CTAB surface area ratio 0.8 to 1.1 Pore volume, PV 1.6 to 3.4 ml/g Silanol group density (V2 = 6 to 20 ml NaOH consumption) Average aggregate size 250 to 1500 nm CTAB surface area 30 to 350 m.sup.2 /g DBP value 150 to 300 ml/100 g V.sub.2 /V.sub.1 by Hg porosimetry 0.19 to 0.46 DBP/CTAB 1.2 to 2.4. ______________________________________is produced by reacting alkali silicate with mineral acids at temperatures of 60 to 95.degree. C. while maintaining a pH of 7.5 to 10.5 and continuously stirring, continuing the reaction to a solids concentration in the precipitation suspension of 90 to 120 g/l, adjusting the pH value to a value of less than or equal to 5, filtering out, washing, drying and optionally grinding or granulating the precipitated silica. The precipitated silica is used as a filler in vulcanizable rubber compounds and vulcanizates.

Abstract: Precipitated silica with a sodium sulphate content of 4 to 18 wt. %, particularly with the physical-chemical data:______________________________________ Sodium sulphate content: 4-14 wt. % BET surface area (DIN 66131): 100-190 m.sup.2 /g DBP absorption (anhydrous) 208-250 g/100 g (DIN 53601, ASTM D 2414): 3.0-6.5 wt. % (DIN ISO 787/II) Oversize with >63 .mu.m .ltoreq. 10.0 wt. % ALPINE air-jet sieve >150 .mu.m .ltoreq. 0.1 wt. % >250 .mu.m .ltoreq. 0.01 wt. % ______________________________________It is prepared by introducing hot water into a precipitation vessel, with stirring, adding water glass, then heating the mixture and maintaining the temperature throughout the remainder of the precipitation period. Water glass and sulphuric acid are added simultaneously during this process. The precipitated silica is then separated from the suspension and the filter cake containing sodium sulphate is dried in a spray drier and ground.

Abstract: Precipitated silicas, characterized in that they have a CTAB surface area (in accordance with ASTM D 3765-92) of 200 to 400 m.sup.2 /g, a DBP index (in accordance with ASTM D 2414) between 230 and 380 ml/100 g as powder and 180-250 g/100 g as granulate, a silanol group density (V.sub.2 -NaOH consumption) of 20 to 30 ml and the following macropore size distribution which is typical of the surface area range involved, determined by means of Hg porosimetry (DIN 66 133) for specific pore size intervals (incremental mode of application):______________________________________ CTAB surface CTAB surface CTAB surface area range: area range: area range: 200-250 m.sup.2 /g 250-300 m.sup.2 /g 300-400 m.sup.2 /g Pore size interval ?nm! Hg consumption in ml/g of silica ______________________________________ 10-20 0.27-0.49 0.35-0.50 0.32-0.42 20-30 0.22-0.32 0.15-0.30 0.17-0.22 30-40 0.15-0.21 0.12-0.17 0.12-0.15 40-50 0.11-0.16 0.09-0.12 0.08-0.11 50-60 0.08-0.12 0.06-0.10 0.06-0.