§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4550135A Expired / Lapsed US ⏱️ 0.0 years remaining

Tire rubber composition

Assignee: Toyo Tire Corp
•
Filing: 1984-07-20
•
Granted: 1985-10-29
•
Expires: 2004-07-20
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A rubber tire composition, comprising: from 20 to 150 parts by weight of carbon black incorporated in 100 parts by weight of rubber; at least 30 parts by weight of said rubber being a star type solution polymerized random styrene-butadiene copolymer rubber comprising 10% to 20% by weight of styrene units and the balance of butadiene units; said styrene units having at least 40% by weight of the single isolated styrene units which are separated from each other and 5% by weight or less of the styrene units in the form of long chain blocks each consisting of 8 or more styrene units bound to each other, based on the entire weight of said styrene units in the copolymer; said butadiene units having 35% to 50% by mole of butadiene units in the form of 1,2-vinyl structure based on the entire mole of said butadiene units in the copolymer; said styrene-butadiene copolymer rubber having the ratio (Mw/Mn) of 1.2 to 3.5, wherein Mw and Mn represent the weight average and number average molecular weights, respectively; and said styrene-butadiene copolymer rubber having a coupling efficiency of 40% or more; and said carbon black being a furnace carbon black having (1) a specific surface area (N 2 SA) in the range of 75 to 105 as measured by nitrogen adsorption technique, (2) the difference between said N 2 SA value and the measured iodine adsorption value (IA) being at least 15 (i.e., N 2 SA-IA≧15) and (3) the difference between said N 2 SA value and the measured specific surface area (CTAB) as determined by the cetyltrimethylammonium bromide adsorption technique being not greater than 5 (i.e., N 2 SA-CTAB≦5); said furnace carbon black also having a dibutyl phthalate adsorption value (24M4 DBP) of not greater than 110 (ml/100 g) and a tinting strength (Tint) of 90 to 110, provided that the difference (ΔTint) between the measured Tint and the calculated Tint of the furnace carbon black is not greater than -3 [i.e., (measured Tint)-(calculated Tint)≦-3].

Inventors

  • 👤 Satoshi Iwama
  • 👤 Mitsuaki Hashiyama

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 13:48
CPC Classifications
C; C08; C08L; C08L7/00; B; B60; B60C; B60C1/00; B60C1/0016; C08L53/00; C08L53/02; C08L9/00; C08L9/06; C08K; C08K3/00; C08K3/02; C08K3/04; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/86

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 364 words
A rubber tire composition, comprising: from 20-150 parts by weight of carbon black incorporated in 100 parts by weight of rubber; said rubber comprising at least 30 parts by weight of a star type solution polymerized, random styrene-butadiene copolymer rubber and no more than 70 parts by weight of at least one other diene rubber, said random styrene-butadiene copolymer rubber comprising 10% to 20% by weight of styrene units and the balance of butadiene units; said styrene units having at least 40% by weight of the single isolated styrene units which are separated from each other and 5% by weight or less of the styrene units in the form of long chain blocks each consisting of 8 or more styrene units bound to each other, based on the entire weight of said styrene units in the copolymer; said butadiene units having 35% to 50% by mole of butadiene units in the form of 1,2-vinyl structure based on the entire mole of said butadiene units in the copolymer; said styrene-butadiene copolymer rubber having the ratio (Mw/Mn) of 1.2 to 3.5, wherein Mw and Mn represent the weight average and number average molecular weights, respectively; and said styrene-butadiene copolymer rubber having a coupling efficiency of 40% or more; and said carbon black being a furnace carbon black having (1) a specific surface area (N 2 SA) in the range of 75 to 105 as measured by nitrogen adsorption technique, (2) the difference between said N 2 SA value and the measured iodine adsorption value (IA) being at least 15, as represented by the formula N 2 SA-IA≧15, and (3) the difference between said N 2 SA value and the measured specific surface area (CTAB) as determined by the cetyltrimethylammonium bromide adsorption technique being not greater than 5, as represented by the formula N 2 SA-CTAB≦5; said furnace carbon black also having a dibutyl phthalate adsorption value (24M4 DBP) of not greater than 110 (ml/100 g) and a tinting strength (Tint) of 90 to 110, provided that the difference (Δ Tint) between the measured Tint and the calculated Tint of the furnace carbon black is not greater than -3, as represented by the formula (measured Tint)-(calculated Tint)≦-3.
Claim 2
Dependent Claim 364 words
A rubber tire composition, comprising: from 20-150 parts by weight of carbon black incorporated in 100 parts by weight of rubber; said rubber comprising at least 30 parts by weight of a star type solution polymerized, random styrene-butadiene copolymer rubber and no more than 70 parts by weight of at least one other diene rubber, said random styrene-butadiene copolymer rubber comprising 10% to 20% by weight of styrene units and the balance of butadiene units; said styrene units having at least 40% by weight of the single isolated styrene units which are separated from each other and 5% by weight or less of the styrene units in the form of long chain blocks each consisting of 8 or more styrene units bound to each other, based on the entire weight of said styrene units in the copolymer; said butadiene units having 35% to 50% by mole of butadiene units in the form of 1,2-vinyl structure based on the entire mole of said butadiene units in the copolymer; said styrene-butadiene copolymer rubber having the ratio (Mw/Mn) of 1.2 to 3.5, wherein Mw and Mn represent the weight average and number average molecular weights, respectively; and said styrene-butadiene copolymer rubber having a coupling efficiency of 40% or more; and said carbon black being a furnace carbon black having (1) a specific surface area (N 2 SA) in the range of 75 to 105 as measured by nitrogen adsorption technique, (2) the difference between said N 2 SA value and the measured iodine adsorption value (IA) being at least 15, as represented by the formula N 2 SA-IA≧15, and (3) the difference between said N 2 SA value and the measured specific surface area (CTAB) as determined by the cetyltrimethylammonium bromide adsorption technique being not greater than 5, as represented by the formula N 2 SA-CTAB≦5; said furnace carbon black also having a dibutyl phthalate adsorption value (24M4 DBP) of not greater than 110 (ml/100 g) and a tinting strength (Tint) of 90 to 110, provided that the difference (Δ Tint) between the measured Tint and the calculated Tint of the furnace carbon black is not greater than -3, as represented by the formula (measured Tint)-(calculated Tint)≦-3.
Claim 3
Dependent Claim 19 words
The composition of claim 1, wherein said star type solution polymerized styrene-butadiene copolymer rubber is coupled with tin tetrachloride.
Claim 4
Dependent Claim 36 words
The composition of claim 1, which further comprises at least one additive selected from the group consisting of a vulcanizing agent, a vulcanization acceleration aid, a vulcanization accelerator, an anti-oxidant, a softening agent and a filler.
Claim 5
Dependent Claim 20 words
The composition of claim 1, wherein said composition further contains 70 parts by weight or less of other diene rubber.

References Cited (Backward Citations)

US3725103A Cited
US4035336A Cited
US4071496A Cited
US4309318A Cited
JPS5794030A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-10-28 1989-04-29 1989-10-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-10-28 1993-04-29 1993-10-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-10-28 1997-04-29 1997-10-29 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag