US3768537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire
Assignee: PPG Industries Inc
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Filing: 1972-11-09
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Granted: 1973-10-30
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Expires: 1992-11-09
Abstract
Abstract The novel tire is comprised of a silica-filled rubber compound which includes a coupling agent such as mercaptopropyl trimethoxysilane. The coupling agent is a compound that forms a bond or connection between rubber and silica. The coupling agent is preferably allowed to interact with the silica prior to incorporating the polar compounds, such as metallic oxide accelerators, into the rubber compound.
Inventors
- 👤 J Creasey
- 👤 F Strain
- 👤 R Hess
- 👤 H Hoekje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:07
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08K5/548; B; B60; B60C; B60C1/00; B60C1/0016; C08K9/00; C08K9/04; C08K9/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
21 words
The tire tread as defined in claim 1 wherein A provides a bond with the siliceous pigment through a silicon atom.
Claim 2
Dependent Claim
21 words
The tire tread as defined in claim 1 wherein B provides a bond with the rubber polymer through a sulfur atom.
Claim 3
Dependent Claim
21 words
The tire tread as defined in claim 1 wherein R is a hydrocarbon group having between one and 10 carbon atoms.
Claim 4
Dependent Claim
22 words
A tire tread as defined in claim 1 wherein the coupling agent has the general formula selected from the group consisting of
Claim 5
Dependent Claim
30 words
A tire tread as defined in claim 5 wherein the coupling agent has a general formula selected from the group consisting of: a. A - R - S - R''
Claim 6
Dependent Claim
26 words
The tire tread as defined in claim 1 wherein said coupling agent is a member selected from the group consisting of mercaptopropyl trimethoxysilane and mercaptopropyl triethoxysilane.
Claim 7
Dependent Claim
38 words
The tire tread as defined in claim 7 wherein the rubber compound includes by weight 100 parts of styrene-butadiene rubber, from 40 to 90 parts of finely-divided, reinforcing, siliceous pigment, and from 1 to 3 parts coupling agent.
Claim 8
Dependent Claim
35 words
The tire tread as defined in claim 8 wherein said rubber compound includes polar ingredients and wherein said coupling agent is reacted with said silica prior to adding said polar ingredients to said rubber compound.
Claim 9
Dependent Claim
107 words
A curable rubber tire tread or base stock comprising by weight 100 parts unsaturated rubber polymer of styrene-butadiene, butadiene oR natural rubber from 40 to 90 parts finely-divided, reinforcing, siliceous pigment, having an ultimate particle size in the range between 100 and 300 angstroms and a minor effective coupling amount of from 0.1 to 15 parts coupling agent having the general formula A - R - B, wherein A represents a functional group capable of bonding to the siliceous pigment, B represents a group capable of providing a sulfur that will bond with the rubber polymer, and R represents a functional group which connects A and B.
Claim 10
Dependent Claim
18 words
The tire tread as defined in claim 1 wherein the reinforcing pigment consists essentially of a siliceous pigment.
Claim 11
Dependent Claim
27 words
The tire tread as defined in claim 1 wherein carbon black is present in a coloring amount of about 1 part per 100 parts of rubber polymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |