US4495326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber compounds containing zinc dimethacrylate
Assignee: Bridgestone Americas Tire Operations LLC
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Filing: 1984-01-09
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Granted: 1985-01-22
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Expires: 2004-01-09
Abstract
Abstract Sulfur-curable, carbon black reinforced material rubber compounds having improved processing properties in the uncured state and improved strength and dynamic properties in the cured state are obtained by the addition of from about 0.2 to about 15 parts by weight per 100 parts by weight of natural rubber of a zinc dimethacrylate having a surface area of from about 3.7 to about 5.4 m2/g or more to the compounds. The addition of the zinc dimethacrylate to the compounds permits the use of lower quantities of carbon black than would ordinarily be employed in the absence of the zinc dimethacrylate while still providing for the improved properties.
Inventors
- 👤 Thomas F. Donatelli
- 👤 Philip F. Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:36
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A sulfur-curable natural rubber compound comprising: (a) 100 parts by weight of natural rubber; (b) from about 20 to 120 parts by weight of carbon black; (c) from about 1 to about 15 parts by weight of sulfur; and (d) from about 0.2 to about 15 parts by weight of a zinc dimethacrylate powder having a surface area of from about 3.7 to about 5.4 m 2 /g or more.
Claim 2
Dependent Claim
70 words
A sulfur-curable natural rubber compound comprising: (a) 100 parts by weight of natural rubber; (b) from about 20 to 120 parts by weight of carbon black; (c) from about 1 to about 15 parts by weight of sulfur; and (d) from about 0.2 to about 15 parts by weight of a zinc dimethacrylate powder having a surface area of from about 3.7 to about 5.4 m 2 /g or more.
Claim 3
Dependent Claim
21 words
The sulfur-curable natural rubber compound of claim 1 wherein the zinc dimethacrylate has a surface area of 4.5 m 2 /g.
Claim 4
Dependent Claim
22 words
The sulfur-curable natural rubber compound of claim 1 wherein said compound contains from 30 to 90 parts by weight of carbon black.
Claim 5
Dependent Claim
21 words
The sulfur-curable natural rubber compound of claim 1 wherein said compound contains from 2 to 10 parts by weight of sulfur.
Claim 6
Dependent Claim
22 words
The sulfur-curable natural rubber compound of claim 1 wherein said compound contains from 0.5 to 10 by weight of said zinc dimethacrylate.
References Cited (Backward Citations)
GB1091818A
Cited
US3823122A
Cited
US4082288A
Cited
US4192790A
Cited
US4191671A
Cited
GB2042553A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |