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US5254618A
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Tread rubber compositions for heavy duty pneumatic tire
Assignee: Bridgestone Corp
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Filing: 1991-11-25
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Granted: 1993-10-19
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Expires: 2011-11-25
Abstract
Abstract A tread rubber composition for heavy duty pneumatic tire comprises a particular amount of a particular carbon black satisfying CTAB of 130-160 m 2 /g, DBP of 90-120 m/100 g and Dm of not more than 210 Å, based on 100 parts by weight of at least one rubber component.
Inventors
- 👤 Masayuki Ohashi
- 👤 Hiroshi Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:49
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/50; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
A tread rubber composition for heavy duty pneumatic tire comprising 30-100 parts by weight of carbon black satisfying the following conditions: (1) cetyl trimethyl ammonium bromide adsorption specific surface area (CTAB) is within a range of 130-160 m 2 /g; (2) dibutylphathalate absorption (DBP) is within a range of 90-120 ml/100 g; and (3) average void size of aggregate (Dm) is not more than 210 Å, based on 100 parts by weight of at least one rubber component selected from natural rubber and diene series rubbers.
Claim 2
Dependent Claim
86 words
A tread rubber composition for heavy duty pneumatic tire comprising 30-100 parts by weight of carbon black satisfying the following conditions: (1) cetyl trimethyl ammonium bromide adsorption specific surface area (CTAB) is within a range of 130-160 m 2 /g; (2) dibutylphathalate absorption (DBP) is within a range of 90-120 ml/100 g; and (3) average void size of aggregate (Dm) is not more than 210 Å, based on 100 parts by weight of at least one rubber component selected from natural rubber and diene series rubbers.
Claim 3
Dependent Claim
25 words
The tread rubber composition according to claim 1, wherein said synthetic rubber is selected from isoprene rubber, butadiene rubber, butyl rubber and styrene-butadiene copolymer rubber.
Claim 4
Dependent Claim
19 words
The tread rubber composition according to claim 1, wherein said DBP is within a range of 90-100 ml/100 g.
Claim 5
Dependent Claim
17 words
The tread rubber composition according to claim 1, wherein said Dm is not more than 200 Å.
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) | 1996-10-18 | 1997-04-19 | 1997-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-18 | 2001-04-19 | 2001-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-18 | 2005-04-19 | 2005-10-19 | $7700.00 | Window Closed / Lapsed |