Patent US2995602A successfully refreshed from Google Patents.
Patent US5089554A successfully refreshed from Google Patents.
US5089554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica reinforced elastomers
Assignee: Rhone Poulenc Chimie de Base SA
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Filing: 1989-06-13
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Granted: 1992-02-18
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Expires: 2009-06-13
Abstract
Abstract Mechanically improved elastomeric shaped articles include reinforcing amounts of a particulate silica filler material, said silica filler material comprising at least one precipitated silica having (i) a CTAB surface area of from 20 to 200 m2/g, (ii) a mean projected area of aggregates of greater than about 10,000 nm2, and (iii) an inter-aggregate volume of at least 1 cm3/g and an essentially homogeneous inter-aggregate pore population.
Inventors
- 👤 Francis Bomo
- 👤 Yvonick Chevallier
- 👤 Patrick Lamy
- 👤 Jean-Claude Morawski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:00
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/19
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
184 words
An elastomeric shaped article having improved tensile strength and tear strength which comprises a reinforcing amount of a particulate silica filler material for said elastomeric shaped article, said silica filler material comprising at least one precipitated silica having (i) a CTAB surface area of from 20 to 200 m 2 /g, (ii) a mean projected area of aggregates of greater than about 10,000 nm 2 , and (iii) an inter-aggregate volume of at least 1 cm 3 /g and (iv) a DPB oil absorption capacity no greater than 300 ml/100 g, and an essentially homogeneous inter-aggregate pore population wherein: (a) for a CTAB surface area of from 20 to 70 m 2 /g, the mean projected area of aggregates is at least about 30,000 nm 2 ; (b) for a CTAB surface area of from 70 to 120 m 2 /g, the mean projected area of aggregates is at least about 25,000 nm 2 ; and (c) for a CTAB surface area of from 120 to 200 m 2 /g, the mean projected area of aggregates is at least about 15,000 nm 2 .
Claim 2
Dependent Claim
184 words
An elastomeric shaped article having improved tensile strength and tear strength which comprises a reinforcing amount of a particulate silica filler material for said elastomeric shaped article, said silica filler material comprising at least one precipitated silica having (i) a CTAB surface area of from 20 to 200 m 2 /g, (ii) a mean projected area of aggregates of greater than about 10,000 nm 2 , and (iii) an inter-aggregate volume of at least 1 cm 3 /g and (iv) a DPB oil absorption capacity no greater than 300 ml/100 g, and an essentially homogeneous inter-aggregate pore population wherein: (a) for a CTAB surface area of from 20 to 70 m 2 /g, the mean projected area of aggregates is at least about 30,000 nm 2 ; (b) for a CTAB surface area of from 70 to 120 m 2 /g, the mean projected area of aggregates is at least about 25,000 nm 2 ; and (c) for a CTAB surface area of from 120 to 200 m 2 /g, the mean projected area of aggregates is at least about 15,000 nm 2 .
Claim 3
Dependent Claim
41 words
The elastomeric shaped article as defined by claim 1, said at least one precipitated silica having a CTAB surface area of from 20 to 70 m 2 /g, and a mean projected area of at least about 30,000 nm 2 .
Claim 4
Dependent Claim
41 words
The elastomeric shaped article as defined by claim 1, said at least one precipitated silica having a CTAB surface area of from 70 to 120 m 2 /g, and a mean projected area of at least about 25,000 nm 2 .
Claim 5
Dependent Claim
41 words
The elastomeric shaped article as defined by claim 1, said at least one precipitated silica having a CTAB surface area of from 120 to 200 m 2 /g, and a mean projected area of at least about 15,000 nm 2 .
Claim 6
Dependent Claim
27 words
The elastomeric shaped article as defined by claim 4, said at least one precipitated silica having a DBP oil absorption capacity no greater than 300 ml/100 g.
Claim 7
Dependent Claim
40 words
The elastomeric shaped article as defined by claim 1, said at least one precipitated silica having a CTAB surface area of from 20 to 120 m 2 /g, and a DBP oil absorption capacity no greater than 300 ml/100 g.
Claim 8
Dependent Claim
30 words
The elastomeric shaped article as defined by claim 1, the ratio of BET surface area/CTAB surface area of said at least one precipitated silica ranging from about 1 to 1.2.
Claim 9
Dependent Claim
12 words
The elastomeric shaped article as defined by claim 1, comprising a tire.
References Cited (Backward Citations)
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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) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |