Patent US4417027A successfully refreshed from Google Patents.
US4417027A
Expired / Lapsed
US
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Rubber composition for side wall of tire
Assignee: Toyo Tire Corp
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Filing: 1982-06-18
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Granted: 1983-11-22
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Expires: 2002-06-18
Abstract
Abstract A rubber composition for a side wall of tires comprising a polymer blend of 20-100 parts by weight of solution polymerization star shaped SBR and 80-0 parts by weight of natural rubber and/or diene synthetic rubber. The glass transition temperature (Tg) of said star shaped SBR is preferably less than -50° C. Styrene content in said star shaped SBR is preferably less than 20% parts by weight.
Inventors
- 👤 Masanori Kan
- 👤 Takuya Okazaki
- 👤 Tatsuo Sakashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:49
CPC Classifications
C; C08; C08L; C08L7/00; B; B60; B60C; B60C1/00; B60C1/0025; C08L9/00; C08L9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A rubber composition for tire side walls comprising: 30-70 parts by weight of solution polymerization star shaped SBR having a glass transistion temperature of less than -50° C., said star shaped SBR further having a styrene content less than 20 percent by weight; and 70-30 parts by weight of a rubber selected from the group consisting of natural rubber, diene synthetic rubber and mixtures thereof, wherein said rubber and said star shaped SBR comprise 100 percent of the polymer material in the composition.
Claim 2
Dependent Claim
83 words
A rubber composition for tire side walls comprising: 30-70 parts by weight of solution polymerization star shaped SBR having a glass transistion temperature of less than -50° C., said star shaped SBR further having a styrene content less than 20 percent by weight; and 70-30 parts by weight of a rubber selected from the group consisting of natural rubber, diene synthetic rubber and mixtures thereof, wherein said rubber and said star shaped SBR comprise 100 percent of the polymer material in the composition.
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) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |