US3994742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber additive of silica and organic coupling agent
Assignee: PPG Industries Inc
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Filing: 1974-11-29
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Granted: 1976-11-30
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Expires: 1994-11-29
Abstract
Abstract Abrasion-resistant vulcanized rubber compositions which are also resistant to heat build-up are provided which are useful as tire treads and subtreads for vehicles, e.g., automobiles. The compounds comprise the vulcanizate of a rubber polymer, a finely-divided reinforcing siliceous pigment, and an organic coupling agent having at least one nitrogen functional group that bonds to the siliceous pigment and at least one sulfur functional group that bonds to the rubber polymer.
Inventors
- 👤 David B. Russell
- 👤 Thomas J. Doran, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:28
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; B; B60; B60C; B60C1/00; B60C1/0016; C08K3/00; C08K3/34; C08K3/36; C08L; C08L101/00; C08L21/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
A rubber compounding additive suitable for incorporation into a vulcanizable rubber composition containing a vulcanizable rubber polymer which comprises a major amount of rubber reinforcing finely-divided siliceous pigment and a minor amount of an organic coupling agent the functional groups of which consist essentially of at least one sulfur functional group capable of bonding to a vulcanizable rubber polymer and at least two amino or imino nitrogen functional groups capable of bonding to the siliceous pigment, the ratio of nitrogen functional group to sulfur functional group being at least 2:1, said amount of coupling agent being sufficient to improve the abrasion resistance of a vulcanizate into which it is incorporated.
Claim 2
Dependent Claim
110 words
A rubber compounding additive suitable for incorporation into a vulcanizable rubber composition containing a vulcanizable rubber polymer which comprises a major amount of rubber reinforcing finely-divided siliceous pigment and a minor amount of an organic coupling agent the functional groups of which consist essentially of at least one sulfur functional group capable of bonding to a vulcanizable rubber polymer and at least two amino or imino nitrogen functional groups capable of bonding to the siliceous pigment, the ratio of nitrogen functional group to sulfur functional group being at least 2:1, said amount of coupling agent being sufficient to improve the abrasion resistance of a vulcanizate into which it is incorporated.
Claim 3
Dependent Claim
22 words
The addition of claim 1 wherein there is from about 5 to 60 parts of siliceous pigment per part of coupling agent.
Claim 4
Dependent Claim
22 words
The additive of claim 1 wherein there is from about 10 to 40 parts of siliceous pigment per part of coupling agent.
Claim 5
Dependent Claim
23 words
The additive of claim 1 wherein the nitrogen functional group is a primary, secondary or tertiary amino groups and mixtures of such groups.
Claim 6
Dependent Claim
18 words
The additive of claim 4 wherein the coupling agent contains at least 5 nitrogen functional groups per molecule.
Claim 7
Dependent Claim
13 words
The additive of claim 1 wherein the coupling agent is a mercaptoalkylated poly(alkyleneimine).
Claim 8
Dependent Claim
13 words
The additive of claim 1 wherein the coupling agent is a mercaptoalkylated polyethyleneimine.
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) | 1979-11-30 | 1980-05-31 | 1980-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-30 | 1984-05-31 | 1984-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-30 | 1988-05-31 | 1988-11-30 | $7700.00 | Window Closed / Lapsed |