US4359342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica reinforced rubber
Assignee: Phillips Petroleum Co
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Filing: 1981-01-28
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Granted: 1982-11-16
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Expires: 2001-01-28
Abstract
Abstract Incorporating a reinforcement promoter into the silica prior to the drying of the silica which is precipitated has been found to result in a significant improvement of the heat buildup properties of rubber reinforced by such silica as compared to adding both silica and the promoter to the rubber mixture.
Inventors
- 👤 Carl J. Stacy
- 👤 Jerold D. Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:59
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/309; C08; C08K; C08K9/00; C08K9/04; C08K9/06; C09C3/00; C09C3/08; C09C3/12; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
Process to produce a silica reinforcing agent by acid precipitation of silica comprising (a) precipitating silica from an aqueous silicate solution by adding acid thereto to form a silica comprising slurry, (b) incorporating a reinforcing promoter into said slurry by adding said reinforcing promoter prior to, during or after step (a) but prior to any heat treatment or drying of the silica obtained in step (a) to obtain a promoted silica containing slurry, said promoter being defined as a chemical compound having at least one first molecular moiety that exhibits an affinity to silica or that is capable of attaching itself to the silica, and at least one second molecular moiety that is capable of forming a bond with a carbon atom, (c) recovering said promoted silica from said slurry.
Claim 2
Dependent Claim
130 words
Process to produce a silica reinforcing agent by acid precipitation of silica comprising (a) precipitating silica from an aqueous silicate solution by adding acid thereto to form a silica comprising slurry, (b) incorporating a reinforcing promoter into said slurry by adding said reinforcing promoter prior to, during or after step (a) but prior to any heat treatment or drying of the silica obtained in step (a) to obtain a promoted silica containing slurry, said promoter being defined as a chemical compound having at least one first molecular moiety that exhibits an affinity to silica or that is capable of attaching itself to the silica, and at least one second molecular moiety that is capable of forming a bond with a carbon atom, (c) recovering said promoted silica from said slurry.
Claim 3
Dependent Claim
53 words
A process in accordance with claim 1 wherein (a) said reinforcing promoter is added to the slurry obtained in step (a) such as to produce a promoter containing slurry, (b) the promoter containing slurry is thoroughly stirred, (c) the promoter containing slurry is washed and (d) the washed promoter containing slurry is dried.
Claim 4
Dependent Claim
10 words
A promoted silica obtained by the process of claim 2.
Claim 5
Dependent Claim
25 words
A promoted silica of claim 3 containing about 100 parts by weight of precipitated silica and about 1 to 12 parts by weight of promoter.
Claim 6
Dependent Claim
46 words
A rubber composition comprising (a) 100 parts by weight of a rubber selected from the group consisting of natural rubber, silica reinforceable synthetic polymers and copolymers and mixtures of these rubbers, (b) 25 to 60 parts by weight of promoted silica of claim 3 or 4.
Claim 7
Dependent Claim
118 words
A process for the production of an article of reinforced rubber comprising (a) mixing 100 parts by weight of a rubber selected from the group consisting of natural rubber, silica reinforceable synthetic polymers and copolymers and mixtures of such rubbers with 25 to 60 parts by weight of a promoted silica of claim 3 or 4, said mixing being carried out at a temperature well below the temperature of reaction or activation between the promoted silica and the rubber, (b) shaping said article from said mixture obtained in step (a) and subjecting said article to the activating temperature at which significant reinforcing or crosslinking of the rubber with the promoted silica occurs, (c) recovering the shaped reinforced article.
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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) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |