US2007181036A1PendingUtilityA1

Precipitated silica used as reinforcing filler for elastomers

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Assignee: CHEVALLIER YVONICKPriority: May 26, 1997Filed: Apr 6, 2007Published: Aug 9, 2007
Est. expiryMay 26, 2017(expired)· nominal 20-yr term from priority
Inventors:Yvonick ChevallierPhilippe CochetPatrick Fourre
C08K 2201/002C01B 33/193C01P 2006/14C01P 2006/11C01P 2004/64C01P 2006/22C01P 2006/19C01P 2006/17B82Y 30/00C01P 2004/50C01P 2004/51C01P 2006/12C09C 1/30C01P 2004/32C01P 2004/61C08K 3/36C01P 2006/16C01P 2004/62C08K 7/26C08K 2201/006C08K 7/18Y10T428/2982C09C 1/28C08K 2201/003C08K 2201/005
62
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Claims

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 m 2 /g, a CTAB specific surface of between 180 and 240 m 2 /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 (V d1 ), made up of the pores with a diameter of less than 1 μm, of greater than 1.65 cm 3 /g, a fineness value (F.V.) of between 70 and 100 Å, and a content of fines (τ f ), after deagglomerability with ultrasound, of at least 50%.

Claims

exact text as granted — not AI-modified
1 - 26 . (canceled)  
     
     
         27 . A precipitated silica, having: 
 a BET specific surface of between 185 and 220 m 2 /g,    a CTAB specific surface of between 190 and 240 m 2 /g,    a pore distribution and pore volumes V1, and V2, such that the pore volume V2 made up of pores with a diameter of between 175 and 275 Å represents less than 50% of the pore volume V1 made up of pores with diameters of less than or equal to 400 Å,    a pore volume (V d1 ), made up of pores with a diameter of less than 1 μm, of at least 1.70 cm 3 /g,    a fineness value (F.V.) of between 80 and 100 Å, and    a content of fines (τ f ), after deagglomerability with ultrasound, of at least 50%.    
     
     
         28 . A silica according to  claim 27 , having a pore distribution such that the ratio V2/V1 is not more than 0.45.  
     
     
         29 . A silica according to  claim 27 , having a median diameter (φ50), after deagglomerability with ultrasound, of less than 8.5 μm.  
     
     
         30 . A silica according to  claim 29 , wherein the median diameter (φ50), is between 5 and 7 μm.  
     
     
         31 . A silica according to  claim 27 , having an ultrasound deagglomerability factor (F D ) of greater than 5.5 ml.  
     
     
         32 . A silica according to  claim 31 , wherein the ultrasound deagglomerability factor (F D ) is greater than 9 ml.  
     
     
         33 . A silica according to  claim 27 , having a pore volume (V3), made up of pores with a diameter of between 100 and 300 Å, of at least 0.82 cm 3 /g.  
     
     
         34 . A silica according to  claim 27 , having a total pore volume (TPV) of greater than 3.0 cm 3 /g.  
     
     
         35 . A silica according to  claim 34 , wherein the total pore volume (TPV) is of between 3.1 and 3.4 cm 3 /g.  
     
     
         36 . A silica according to  claim 27 , having a packed filling density (PFD) of greater than 0.28.  
     
     
         37 . A silica according to  claim 27 , having an oil absorption value DOP of between 230 and 330 ml/100 g.  
     
     
         38 . A silica according to  claim 27 , being in the form of substantially spherical beads with an average size of at least 80 μm.  
     
     
         39 . A silica according to  claim 27 , being in the form of powder with an average size of at least 15 μm.  
     
     
         40 . A silica according to  claim 27 , being in the form of granules at least 1 mm in size.  
     
     
         41 . A reinforcing filler for elastomers, comprising a silica as defined in  claim 27 .  
     
     
         42 . A silica according to  claim 27 , wherein the pore volume (V d1 ), is between 1.70 and 1.80 cm 3 /g.  
     
     
         43 . A silica according to  claim 30 , having a pore distribution such that the ratio V2/V1 is not more than 0.45.  
     
     
         44 . A silica according to  claim 30 , having an ultrasound deagglomerability factor (F D ) of greater than 5.5 ml.  
     
     
         45 . A silica according to  claim 30 , having a pore volume (V3), made up of pores with a diameter of between 100 and 300 Å, of at least 0.82 cm 3 /g.  
     
     
         46 . A silica according to  claim 30 , having a total pore volume (TPV) of greater than 3.0 cm 3 /g.  
     
     
         47 . A silica according to  claim 30 , being in the form of substantially spherical beads with an average size of at least 80 μm.  
     
     
         48 . A silica according to  claim 30 , being in the form of powder with an average size of at least 15 μm.  
     
     
         49 . A silica according to  claim 30 , being in the form of granules at least 1 mm in size.  
     
     
         50 . A reinforcing filler for elastomers, comprising a silica as defined in  claim 30 .  
     
     
         51 . A silica according to  claim 27 , having a BET specific surface of between 200 and 220 m 2 /g and a CTAB specific surface of between 190 and 205 m 2 /g

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