US4409356A
Expired / Lapsed
US
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Organosilicic elastomers reinforced with improved precipitated silica particulates
Assignee: Rhone Poulenc Industries SA
•
Filing: 1980-12-19
•
Granted: 1983-10-11
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Expires: 2000-12-19
Abstract
Abstract Mechanically/thermally improved, filler reinforced organosilicic elastomers, e.g., organopolysiloxanes, are comprised of a reinforcing amount of precipitated silica particulates having the properties: -(i) BET surface area 190 to 340 m2/g -(ii) CTAB surface area 180 to 280 m2/g - -(iii) <IMAGE> 0.9 to 1.2 - -(iv) Residual sodium content <500 ppm -(v) pH 3.5 to 6.0 -(vi) Specific volume Vo >4.2 -(vii) Amount of particles of <0.05% - a size as will not pass - through a 45 mu mesh sieve -
Inventors
- 👤 Robert Lagarde
- 👤 Georges Vrisakis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:11
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; C01P2006/82; C01P2006/90
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
81 words
A filler reinforced organosilicic polymeric composition of matter, the reinforcing filler therefor comprising a reinforcing amount of precipitated silica 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
<0.05%
a size as will not pass
through a 45μ mesh sieve
______________________________________
Claim 2
Dependent Claim
81 words
A filler reinforced organosilicic polymeric composition of matter, the reinforcing filler therefor comprising a reinforcing amount of precipitated silica 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
<0.05%
a size as will not pass
through a 45μ mesh sieve
______________________________________
Claim 3
Dependent Claim
74 words
The composition of matter as defined by claim 1, said precipitated silica 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 to 5.5
(vi) Specific volume V.sub.o
>4.2
(vii) Amount of particles of
<0.05%
a size as will not pass
through a 45μ mesh sieve
______________________________________
Claim 4
Dependent Claim
23 words
The composition of matter as defined by claims 1 or 2, comprising from 5 to 50% by weight of said precipitated silica particulates.
Claim 5
Dependent Claim
15 words
The composition of matter as defined by claim 3, said organosilicic polymer being an organopolysiloxane.
Claim 6
Dependent Claim
164 words
The composition of matter as defined by claim 4, said organopolysiloxane comprising siloxane recurring units having the structural formula: ##EQU3## or such units (I) in combination with siloxane recurring units having the structural formula: ##EQU4## wherein R is an alkyl or haloalkyl radical having from 1 to 5 carbon atoms and containing from 1 to 6 chlorine and/or fluorine atoms, a cycloalkyl or halocycloalkyl radical having from 3 to 8 carbon atoms and containing from 1 to 4 chlorine and/or fluorine atoms, an aryl, alkylaryl or haloaryl radical having from 6 to 8 carbon atoms and containing from 1 to 4 chlorine and/or fluorine atoms, and a cyanoalkyl radical having from 3 to 4 carbon atoms; Z is a hydrogen atom, an alkenyl group, a hydroxyl group, a hydrolyzable atom or hydrolyzable group; n is an integer of 0, 1, 2 or 3; x is an integer of 0, 1, 2 or 3; and y is an integer less than or equal to 2.
Claim 7
Dependent Claim
27 words
The composition of matter as defined by claim 5, said organopolysiloxane being heat vulcanizable in the presence of a peroxide catalyst, and being devoid of hydrolyzable functions.
Claim 8
Dependent Claim
29 words
The composition of matter as defined by claim 5, said organopolysiloxane comprising vinylsilyl and hydrogenosilyl radicals, being vulcanizable by cross-linking between such radicals, and being devoid of hydrolyzable functions.
Claim 9
Dependent Claim
36 words
The composition of matter as defined by claim 5, comprising a maximum of 15% by weight of siloxane recurring units of the formula (II) wherein Z is a hydrolyzable atom or group and being moisture curable.
Claim 10
Dependent Claim
32 words
The composition of matter as defined by claim 5, said organopolysiloxane being cold vulcanizable and comprising siloxane recurring units of both formula (I) and (II), and wherein x is at least one.
Claim 11
Dependent Claim
18 words
The composition of matter as defined by claim 9, Z being hydroxyl, and further comprising a cross-linking agent.
Claim 12
Dependent Claim
17 words
The composition of matter as defined by claim 5, said precipitated silica particulates having been surface hydrophobicized.
Claim 13
Dependent Claim
26 words
The composition of matter as defined by claim 1, further comprising at least one additional filler material, plasticizer, thermal stabilizer, thixotropic agent, pigment, or corrosion inhibitor.
Claim 14
Dependent Claim
12 words
The composition of matter as defined by claim 1, in unvulcanized state.
Claim 15
Dependent Claim
12 words
The composition of matter as defined by claim 1, in vulcanized state.
Claim 16
Dependent Claim
15 words
A shaped article comprising the composition of matter as defined by claims 13 or 14.
References Cited (Backward Citations)
US3862081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |