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US4704425A
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Novel precipitated silica particulates
Assignee: Rhone Poulenc Industries SA
•
Filing: 1984-11-20
•
Granted: 1987-11-03
•
Expires: 2004-11-20
Abstract
Abstract Improved precipitated silica particulates, well adapted as a pigment or reinforcing filler for curable organosilic polymers and other elastomers, have the properties: ______________________________________ (i) BET surface area 190 to 340 m 2 /g (ii) CTAB surface area 180 to 280 m 2 /g (iii) ##STR1## 0.9 to 1.2 (iv) Residual sodium content < 500 ppm (v) pH 3.5 to 6.0 (vi) Specific volume V o ≧ 4.2 (vii) Amount of particles of a < 0.05%. size as will not pass through a 45μ mesh sieve ______________________________________
Inventors
- 👤 Robert Lagarde
- 👤 Jean Machurat
- 👤 Jean-Claude Morawski
- 👤 Georges Vrisakis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:25
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/12; C01P2006/80; C01P2006/90
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
73 words
Precipitated silica particulates which are generally non-microporous, said particulates having the properties: ______________________________________
(i) BET surface area 190 to 340 m.sup.2 /g
(ii) CTAB surface area 180 to 280 m.sup.2 /g
(iii)
##STR4## 0.9 to 1.2
(iv) Residual sodium content
< 500 ppm
(v) pH 3.5 to 6.0
(vi) Specific volume V.sub.o ≧ 4.2
(vii) Amount of particles of a
< 0.05%.
size as will not pass
through a 45μ mesh sieve
______________________________________
Claim 2
Dependent Claim
73 words
Precipitated silica particulates which are generally non-microporous, said particulates having the properties: ______________________________________
(i) BET surface area 190 to 340 m.sup.2 /g
(ii) CTAB surface area 180 to 280 m.sup.2 /g
(iii)
##STR4## 0.9 to 1.2
(iv) Residual sodium content
< 500 ppm
(v) pH 3.5 to 6.0
(vi) Specific volume V.sub.o ≧ 4.2
(vii) Amount of particles of a
< 0.05%.
size as will not pass
through a 45μ mesh sieve
______________________________________
Claim 3
Dependent Claim
70 words
The precipitated silica particulates as defined by claim 1, said particulates having the properties: ______________________________________
(i) BET surface area 200 to 250 m.sup.2 /g
(ii) CTAB surface area 190 to 240 m.sup.2 /g
(iii)
##STR5## 0.9 to 1.2
(iv) Residual sodium content
<500 ppm
(v) pH 4.5-5.5
(vi) Specific volume V.sub.o
≧4.2
(vii) Amount of particles of a
<0.05%
size as will not pass
through a 45μ mesh sieve.
______________________________________
Claim 4
Dependent Claim
15 words
The precipitated silica particulates as defined by claim 1, said particulates having been surface hydrophobicitized.
Claim 5
Dependent Claim
15 words
The precipitated silica particulates as defined by claim 2, said particulates having been surface hydrophicitized.
Claim 6
Dependent Claim
54 words
Precipitated silica particulates which are generally non-microporous, said particulates having the properties: ______________________________________
(i) BET surface area 190 to 340 m.sup.2 /g
(ii) CTAB surface area 180 to 280 m.sup.2 /g
(iii)
##STR6## 0.9 to 1.2
(iv) Residual sodium content
<500 ppm
(v) pH 3.5 to 6.0
(vi) Specific volume V.sub.o ≧ 4.2.
______________________________________
Claim 7
Dependent Claim
54 words
Precipitated silica particulates which are generally non-microporous, said particulates having the properties: ______________________________________
(i) BET surface area 190 to 340 m.sup.2 /g
(ii) CTAB surface area 180 to 280 m.sup.2 /g
(iii)
##STR6## 0.9 to 1.2
(iv) Residual sodium content
<500 ppm
(v) pH 3.5 to 6.0
(vi) Specific volume V.sub.o ≧ 4.2.
______________________________________
Claim 8
Dependent Claim
53 words
The precipitated silica particulates as defined by claim 1, said particulates having the properties: ______________________________________
(i) BET surface area 200 to 250 m.sup.2 /g
(ii) CTAB surface area 190 to 240 m.sup.2 /g
(iii)
##STR7## 0.9 to 1.2
(iv) Residual sodium content
<500 ppm
(v) pH 4.5-5.5
(vi) Specific volume v.sub.o
≧4.2.
______________________________________
Claim 9
Dependent Claim
55 words
Flash-dried precipitated silica particulates which are generally non-microporous, said particulates having the properties: ______________________________________
(i) BET surface area 190 to 340 m.sup.2 /g
(ii) CTAB surface area 180 to 280 m.sup.2 /g
(iii)
##STR8## 0.9 to 1.2
(iv) Residual sodium content
<500 ppm
(v) pH 3.5 to 6.0
(vi) Specific volume V.sub.o ≧ 4.2.
______________________________________
Claim 10
Dependent Claim
55 words
Flash-dried precipitated silica particulates which are generally non-microporous, said particulates having the properties: ______________________________________
(i) BET surface area 190 to 340 m.sup.2 /g
(ii) CTAB surface area 180 to 280 m.sup.2 /g
(iii)
##STR8## 0.9 to 1.2
(iv) Residual sodium content
<500 ppm
(v) pH 3.5 to 6.0
(vi) Specific volume V.sub.o ≧ 4.2.
______________________________________
Claim 11
Dependent Claim
53 words
The precipitated silica particulates as defined by claim 5, said particulates having the properties: ______________________________________
(i) BET surface area 200 to 250 m.sup.2 /g
(ii) CTAB surface area 190 to 240 m.sup.2 /g
(iii)
##STR9## 0.9 to 1.2
(iv) Residual sodium content
<500 ppm
(v) pH 4.5-5.5
(vi) Specific volume V.sub.o
≧4.2.
______________________________________
Claim 12
Dependent Claim
31 words
In a filled, reinforced non-organosilicic elastomeric composition of matter, the improvement which comprises as the reinforcing filler therefor, a reinforcing amount of the precipitated silica particulates as defined by claim 5.
Claim 13
Dependent Claim
14 words
The elastomeric composition of claim 9, wherein the elastomeric composition comprises a styrene-butadiene copolymer.
Claim 14
Dependent Claim
31 words
In a filled, reinforced non-organosilicic elastomeric composition of matter, the improvement which comprises, as the reinforcing filler therefor, a reinforcing amount of the precipitated silica particulates as defined by claim 6.
Claim 15
Dependent Claim
14 words
The elastomeric composition of claim 10 wherein the elastomeric composition comprises a styrene-butadiene copolymer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |