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US4908401A Expired / Lapsed US ⏱️ 0.0 years remaining

Rubber composition for tire tread

Assignee: Toyo Tire Corp
•
Filing: 1988-12-21
•
Granted: 1990-03-13
•
Expires: 2008-12-21
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Abstract

Abstract A rubber composition comprising 40 to 100 parts by weight of carbon black per 100 parts by weight of a rubber component, (a) the rubber composition being characterized in that the rubber component contains, in 100 parts by weight thereof, at least 20 parts by weight of a block copolymer prepared by solution polymerization and comprising one unit of butadiene rubber portion and one unit of random-copolymerized styrene-butadiene rubber portion, the butadiene rubber portion having a vinyl content of 15 to 50%, the styrene-butadiene rubber portion having a vinyl content of 20 to 70% and a styrene content of 30 to 60%, the block copolymer having in its entirety a vinyl content of 15 to 60% and a styrene content of 5 to 30% at least 40% of the copolymer being coupled with a tin compound so that the coupled copolymer has a butadiene rubber terminal, the coupled copolymer having only a single Tg at a temperature of up to -60° C., 0 to 80 parts by weight of natural rubber, synthetic polyisoprene rubber, synthetic polybutadiene rubber, synthetic styrene-butadiene rubber, modified products of thers rubbers, or mixtures thereof; (b) the rubber composition being further characterized in that the carbon black has a specific surface area value (N 2 SA) withinthe range of 75 ot 105 as determiend by the nitrogen adsorption method and is at least 15 in the difference between N 2 SA and the iodine adsorption value (IA) thereof, up to 5 in the difference between N 2 SA and the specific surface area valve (CTAB) thereof as determined by the cetyltrimethylammonium bromide adsorption method, 90 to 110 in tint strength and up to -3 in the measured tint strength minus the calculated tint stength (Δtint).

Inventors

  • 👤 Riichiro Ohara
  • 👤 Satoshi Iwama
  • 👤 Eiji Ida
  • 👤 Noriyuki Isobe

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 03:46
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06; B; B60; B60C; B60C1/00; B60C1/0016; C08K; C08K3/00; C08K3/02; C08K3/04; C08L21/00; C08L53/00; C08L53/02; C08L53/025; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/50; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/19; C01P2006/60; C08L7/00; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/86

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 289 words
A rubber composition comprising 40 to 100 parts by weight of carbon black per 100 parts by weight of a rubber component, (a) the rubber composition being characterized in that the rubber component contains, in 100 parts by weight thereof, at least 20 parts by weight of a block copolymer prepared by solution polymerization and comprising one unit of butadiene rubber portion and one unit of random-copolymerized styrene-butadiene rubber portion, the butadiene rubber portion having a vinyl content of 15 to 50%, the styrene-butadiene rubber portion having a vinyl content of 20 to 70% and a styrene content of 30 to 60%, the block copolymer having in its entirety a vinyl content of 15 to 60% and a styrene content of 5 to 30%, at least 40% of the copolymer being coupled with a tin compound so that the coupled copolymer has a butadiene rubber terminal, the coupled copolymer having only a single Tg at a temperature of up to -60° C., 0 to 80 parts by weight of natural rubber, synthetic polyisoprene rubber, synthetic polybutadiene rubber, synthetic styrene-butadiene rubber, modified products of these rubbers, or mixtures thereof; (b) the rubber composition being further characterized in that the carbon black has a specific surface area value (N 2 SA) within the range of 75 to 105 as determined by the nitrogen adsorption method and is at least 15 in the difference between N 2 SA and the iodine adsorption value (IA) thereof, up to 5 in the difference between N 2 SA and the specific surface area value (CTAB) thereof as determined by the cetyltrimethylammonium bromide adsorption method, 90 to 110 in tint strength and up to -3 in the measured tint strength minus the calculated tint strength (Δtint).
Claim 2
Dependent Claim 289 words
A rubber composition comprising 40 to 100 parts by weight of carbon black per 100 parts by weight of a rubber component, (a) the rubber composition being characterized in that the rubber component contains, in 100 parts by weight thereof, at least 20 parts by weight of a block copolymer prepared by solution polymerization and comprising one unit of butadiene rubber portion and one unit of random-copolymerized styrene-butadiene rubber portion, the butadiene rubber portion having a vinyl content of 15 to 50%, the styrene-butadiene rubber portion having a vinyl content of 20 to 70% and a styrene content of 30 to 60%, the block copolymer having in its entirety a vinyl content of 15 to 60% and a styrene content of 5 to 30%, at least 40% of the copolymer being coupled with a tin compound so that the coupled copolymer has a butadiene rubber terminal, the coupled copolymer having only a single Tg at a temperature of up to -60° C., 0 to 80 parts by weight of natural rubber, synthetic polyisoprene rubber, synthetic polybutadiene rubber, synthetic styrene-butadiene rubber, modified products of these rubbers, or mixtures thereof; (b) the rubber composition being further characterized in that the carbon black has a specific surface area value (N 2 SA) within the range of 75 to 105 as determined by the nitrogen adsorption method and is at least 15 in the difference between N 2 SA and the iodine adsorption value (IA) thereof, up to 5 in the difference between N 2 SA and the specific surface area value (CTAB) thereof as determined by the cetyltrimethylammonium bromide adsorption method, 90 to 110 in tint strength and up to -3 in the measured tint strength minus the calculated tint strength (Δtint).
Claim 3
Dependent Claim 33 words
A rubber composition as defined in claim 1 wherein the block copolymer is contained in an amount of 35 to 100 parts by weight in 100 parts by weight of the rubber component.
Claim 4
Dependent Claim 22 words
A rubber composition as defined in claim 1 wherein 45 to 95% of the block copolymer is coupled with a tin compound.
Claim 5
Dependent Claim 22 words
A rubber composition as defined in claim 1 wherein 50 to 70% of the block copolymer is coupled with a tin compound.
Claim 6
Dependent Claim 33 words
A rubber composition as defined in claim 1 wherein the carbon black is contained in an amount of 45 to 85 parts by weight per 100 parts by weight of the rubber component.

References Cited (Backward Citations)

US3393182A Cited
US4334567A Cited
US4398582A Cited
JPS57102933A Cited
US4548980A Cited
US4550135A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-03-12 1993-09-11 1994-03-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-03-12 1997-09-11 1998-03-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-03-12 2001-09-11 2002-03-13 $7700.00 Window Closed / Lapsed

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