US2005282951A1PendingUtilityA1
Precipitated silica
Est. expiryOct 7, 2013(expired)· nominal 20-yr term from priority
C01P 2004/50C01P 2006/12C01P 2006/19C01B 33/193Y10T428/2982C01P 2006/14C01P 2004/61C01P 2004/62C08K 3/36B60C 1/0016
55
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Claims
Abstract
A precipitated silica with the following physicochemical properties: BET surface area 35 m 2 /g to 350 m 2 /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) (V 2 = NaOH consumption) Average aggregate size 250 nm to 1500 nm CTAB surface area 30 m 2 /g to 350 m 2 /g DBP value 150 ml/100 g to 300 ml/100 g V 2 /V 1 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.
Claims
exact text as granted — not AI-modified1 - 6 . (canceled)
7 . A rubber composition comprising a rubber compound and a precipitated silica having the following physico-chemical properties:
BET surface area:
35 m 2 /g to 350 m 2 /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, ml of NaOH
3 ml/(1.5 g) to 9.5 ml/(1.5 g);
consumed in raising pH to 9:
average aggregate size:
250 nm to 1500 nm;
CTAB surface area:
30 m 2 /g to 350 m 2 /g;
DBP volume:
150 ml/100 g to 300 ml/100 g;
V 2 /V 1 by Hg porosimetry:
0.19 to 0.46; and
DBP/CTAB:
1.2 to 3.5.
8 . The rubber composition of claim 7 , wherein the DBP/CTAB ratio ranges from 1.2 to 2.4.
9 . The rubber composition of claim 7 , wherein said DBP/CTAB ratio is 1.545 to 3.5.
10 . The rubber composition of claim 7 , wherein said V 2 /V 1 by Hg porosimetry ranges from 0.19 to 0.43.
11 . The rubber composition of claim 10 , wherein said V 2 /V 1 by Hg porosimetry ranges from 0.19 to 0.32.
12 . The rubber composition of claim 11 , wherein said V 2 /V 1 by Hg porosimetry ranges from 0.19 to 0.28.
13 . The rubber composition of claim 12 , wherein said V 2 /V 1 by Hg porosimetry ranges from 0.19 to 0.20.
14 . The rubber composition of claim 7 , wherein the precipitated silica is modified with at least one organosilane.
15 . The rubber composition of claim 7 , further comprising at least one filler selected from the group consisting of carbon black, clay, siliceous chalk, commercial silica, and combinations thereof.
16 . The rubber composition of claim 7 , wherein the rubber compound is selected from the group consisting of a natural rubber, butadiene rubber, isoprene rubber, butadiene/styrene rubber, butadiene/acrylonitrile rubber, butyl rubber, terpolymer, and combinations thereof.
17 . The rubber composition of claim 7 , wherein the rubber composition is used in a tire, conveyor belt, seal, V-belt, tube, or shoe sole.
18 . A tire comprising a rubber compound and a precipitated silica having the following physico-chemical properties:
BET surface area:
35 m 2 /g to 350 m 2 /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, ml of NaOH
3 ml/(1.5 g) to 9.5 ml/(1.5 g);
consumed in raising pH to 9:
average aggregate size:
250 nm to 1500 nm;
CTAB surface area:
30 m 2 /g to 350 m 2 /g;
DBP volume:
150 ml/100 g to 300 ml/100 g;
V 2 /V 1 by Hg porosimetry:
0.19 to 0.46; and
DBP/CTAB:
1.2 to 3.5.
19 . The tire of claim 14 , wherein the DBP/CTAB ratio ranges from 1.2 to 2.4.
20 . The tire of claim 14 , wherein said DBP/CTAB ratio is 1.545 to 3.5.
21 . The tire of claim 18 , wherein said V 2 /V 1 by Hg porosimetry ranges from 0.19 to 0.43.
22 . The tire of claim 21 , wherein said V 2 /V 1 by Hg porosimetry ranges from 0.19 to 0.32.
23 . The tire of claim 22 , wherein said V 2 /V 1 by Hg porosimetry ranges from 0.19 to 0.28.
24 . The tire of claim 23 , wherein said V 2 /V 1 by Hg porosimetry ranges from 0.19 to 0.20.
25 . The tire of claim 18 , wherein the precipitated silica is modified with at least one organosilane.
26 . The tire of claim 18 , wherein the tire further comprises at least one filler selected from the group consisting of carbon black, clay, siliceous chalk, commercial silica, and combinations thereof.
27 . The tire of claim 18 , wherein the rubber compound is selected from the group consisting of a natural rubber, butadiene rubber, isoprene rubber, butadiene/styrene rubber, butadiene/acrylonitrile rubber, butyl rubber, terpolymer, and combinations thereof.
28 . A precipitated silica having the following physico-chemical properties:
BET surface area:
35 m 2 /g to 350 m 2 /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, ml of NaOH
3 ml/(1.5 g) to 9.5 ml/(1.5 g);
consumed in raising pH to 9:
average aggregate size:
250 nm to 1500 nm;
CTAB surface area:
30 m 2 /g to 350 m 2 /g;
DBP volume:
150 ml/100 g to 300 ml/100 g;
V 2 /V 1 by Hg porosimetry:
0.19 to 0.43; and
DBP/CTAB:
1.2 to 3.5.
29 . The precipitated silica of claim 28 , wherein the DBP/CTAB ratio ranges from 1.2 to 2.4.
30 . The precipitated silica of claim 28 , wherein said DBP/CTAB ratio ranges from 1.545 to 3.5.
31 . The precipitated silica of claim 28 , wherein said V 2 /V 1 by Hg porosimetry ranges from 0.19 to 0.32.
32 . The precipitated silica of claim 31 , wherein said V 2 /V 1 by Hg porosimetry ranges from 0.19 to 0.28.
33 . The precipitated silica of claim 32 , wherein said V 2 /V 1 by Hg porosimetry ranges from 0.19 to 0.20.
34 . The precipitated silica of claim 28 , wherein said BET surface area ranges from 35 m 2 /g to 150 m 2 /g.
35 . The precipitated silica of claim 34 , wherein said BET surface area ranges from 100 m 2 /g to 150 m 2 /g.
36 . The precipitated silica of claim 28 , wherein said BET surface area ranges from 150 m 2 /g to 350 m 2 /g.
37 . The precipitated silica of claim 36 , wherein said BET surface area ranges from 150 m 2 /g to 200 m 2 /g.Join the waitlist — get patent alerts
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