EP0610197A1 - Compositions pour pneus et courroies - Google Patents

Compositions pour pneus et courroies

Info

Publication number
EP0610197A1
EP0610197A1 EP92909444A EP92909444A EP0610197A1 EP 0610197 A1 EP0610197 A1 EP 0610197A1 EP 92909444 A EP92909444 A EP 92909444A EP 92909444 A EP92909444 A EP 92909444A EP 0610197 A1 EP0610197 A1 EP 0610197A1
Authority
EP
European Patent Office
Prior art keywords
phr
rubber
mixture
weight percent
tire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP92909444A
Other languages
German (de)
English (en)
Inventor
Andreas Herman Hogt
Auke Gerardus Talma
Rudolf Frank De Block
Rabindra Nath Datta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Akzo Nobel NV
Original Assignee
Akzo NV
Akzo Nobel NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/EP1991/002048 external-priority patent/WO1992007904A1/fr
Application filed by Akzo NV, Akzo Nobel NV filed Critical Akzo NV
Publication of EP0610197A1 publication Critical patent/EP0610197A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0016—Compositions of the tread
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0025—Compositions of the sidewalls
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06—Copolymers with styrene

Definitions

  • the present invention relates to tires and belts which have improved properties as compared to standard tire and belt compositions.
  • the inventors have found that tire and belt compositions having a reduced heat buildup exhibit improved properties, especially when subjected to environments which lead to ageing of the rubber compositions.
  • European Patent application 0314271 discloses the use of an improved processing aid to improve handling, durability and rolling resistance of tires, as well as reducing heat buildup.
  • European Patent application 0451 603 relates to the use of an anionic polymerization initiator for curing elastomers to improve their hysteresis. Improved hysteresis leads to tires having a lower rolling resistance. One aspect of hysteresis is heat buildup.
  • PCT patent application WO 91/05821 discloses a tire sidewall composition comprising a particular polymer which leads to sidewalls having a desirable reduced internal heat buildup and improved adhesion to adjacent rubber carcass and tread portions of the tire.
  • publication, "Natural Rubber Compounds for Truck Tires," NR Technology, Vol. 16, Part 1 (1985) suggests the use of additional stearic acid activator in order to reduce the heat generation, among other properties, in truck tires.
  • the present invention relates, in one aspect to a tire wherein at least one of the tread, steel-cord skim stock, sidewall and carcass portions contains a rubber composition formed by curing a blend of at least: 50-100 weight percent of natural rubber, polyisoprene or a mixture thereof,
  • the present invention relates to a belt which contains a rubber composition formed by curing a blend of at least:
  • the low heat buildup rubber compositions of the present invention can be used in tire treads for truck tires and off-the-road tires, in particular, for sidewalls, for tire carcasses and for steel-cord skim stocks.
  • the rubber compositions of the present invention are particularly useful for conveyor belts and V-belts which are subjected to high loading and abrasion in service.
  • a typical truck tire tread composition in accordance with the present invention comprises the cured product of a blend containing:
  • truck tire treads may contain other conventional additives such as 0-20 phr silica, 2-10 phr tackifier, 5-50 phr of processing oil, 1-5 phr waxes, 1-5 phr antioxidant and 1-5 phr antiozonants.
  • Important properties for truck tire treads include abrasion resistance, rolling resistance, resistance to cracking, thermal and oxidative stability and durability.
  • a typical steel-cord skim stock composition in accordance with the present invention is the cured product of a blend comprising:
  • These steel-cord skim stocks may also contain 0-20 phr silica, 0-2.0 phr of a cobalt salt and 1-3 phr of antidegradants. Adhesion to steel is an important property for this portion of the tire.
  • a typical carcass portion of a tire in accordance with the present invention is the cured product of a blend comprising: 50-80 weight percent of natural rubber, polyisoprene or a mixture thereof,
  • carcass portions may also contain 1-3 phr antioxidant and 2-8 phr processing oil, if desired. Important properties for the carcass portion are the thermal resistance and the rebound resilience.
  • a typical sidewall portion of a tire in accordance with the present invention is the cured product of a blend comprising:
  • a typical off-the-road tire tread in accordance with the present invention is the cured product of a blend which comprises:
  • Off-the-road tire treads may also include 5-50 phr of processing oil, 0-5 phr of resin, 0-2 phr wax, 1-4 phr antiozonants and 0.5-2.0 phr antioxidants.
  • Important properties for off-the-road tire treads are tread wear, cutting and chipping resistance and hysteresis.
  • a typical conveyor belt in accordance with the present invention is the cured product of a blend comprising:
  • a typical V-belt in accordance with the present invention is the cured product of a blend comprising:
  • V-belts are fatigue resistance and service life.
  • sulfur examples include various types of sulfur such as powdered sulfur, precipitated sulfur and insoluble sulfur.
  • sulfur donors may be used in place of, or in addition to sulfur in order to provide the required level of sulfur during the vulcanization process.
  • sulfur donors include, but are not limited to, tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, dipentamethylene thiuram hexasulfide, dipentamethylene thiuram tetrasulfide, dithiodimorpholine, caprolactam disulfide and mixtures thereof.
  • references to sulfur shall include sulfur donors and mixtures of sulfur and sulfur donors. Further, references to the quantity of sulfur employed in the vulcanization, when appl ied to sulfur donors, refer to a quantity of sulfur donor which is required to provide the equivalent amount of sulfur that is specified.
  • a vulcanization accelerator in the rubber compound.
  • Conventional , known vulcanization accelerators may be employed.
  • the preferred vulcanization accelerators include mercaptobenzothiazole, 2,2'-mercaptobenzothiazole disulfide, sulfenamide accelerators including
  • 2-(morpholinothio)benzothiazole 2-(morpholinothio)benzothiazole; thiophosphoric acid derivative accelerators, thiurams, dithiocarbamates, diphenyl guanidine, diorthotolyl guanidine, dithiocarbamyl sulfenamides, xanthates, triazine accelerators and mixtures thereof.
  • Other rubber additives may also be employed in their usual amounts.
  • reinforcing agents such as carbon black, silica, clay, whiting and other mineral fillers, as wel l as mixtures of fillers, may be included in the rubber composition.
  • scorch retarders such as phthalic anhydride, pyromellitic anhydride, benzene hexacarboxylic trianhydride, 4-methylphthalic anhydride, trimellitic anhydride, 4-chlorophthalic anhydride, N- cyclohexyl-thiophthalimide, salicylic acid, benzoic acid, maleic anhydride and N-nitrosodiphenylamine may also be included in the rubber composition in conventional, known amounts.
  • steel-cord adhesion promoters such as cobalt salts and dithiosulfates in conventional, known quantities.
  • the process of curing the blends of the present invention is preferably carried out at a temperature of 110-220°C over a period of up to 24 hours. More preferably, the process is carried out at a temperature of 120-190°C over a period of up to 8 hours. All of the additives mentioned above with respect to the rubber composition may also be present during the vulcanization process. In a more preferred embodiment of the vulcanization process, the vulcanization is carried out at a temperature of 120-190°C over a period of up to 8 hours and in the presence of at least one vulcanization accelerator. The best heat buildup in accordance with the present invention is found when vulcanization is carried out at a temperature above 160°C and/or for a period exceeding t 90 .
  • the tire and belt products of the present invention have reduced heat buildup. With respect to the tire products, they exhibit a heat buildup of 20-35°C whereas the belt products exhibit a heat buildup of from 10-35°C.
  • Heat buildup for the purposes of the present specification, was measured using ASTM 623 A at a starting temperature of 100°C. The actual heat buildup is the temperature rise from 100°C to the temperature at which equilibrium was reached. Equilibrium temperature is when the temperature stabilizes and does not rise any further. Note that for some prior art products, the temperature never stabilizes.
  • One way to produce products in accordance with the present invention is to carry out the curing of the blend in the presence of 0.1-5.0 parts by weight of a coagent represented by the general formula A:
  • Ql-D-(Q 2 )n (A); wherein D, optionally containing one or more heteroatoms or groups selected from nitrogen, oxygen, silicon, phosphorus, boron, sulphone and sulphoxy, is a monomeric or oligomeric divalent, trivalent or tetravalent group, n is an integer selected from 1, 2 or 3, Q 1 and Q 2 are independently selected from the formulas I and II:
  • R 1 , R 2 and R 3 are i ndependently selected from hydrogen, C 1 -C 18 al kyl groups, C 3 -C 18 cycloal kyl groups, C 6 -C 18 aryl groups, C 7 -C 30 aral kyl groups and C 7 -C 30 al karyl groups and R 2 and R 3 may combine to form a ring when R 1 is hydrogen; B and B 1 are independently selected from the fol lowing hetero atoms: oxygen and sulfur.
  • These imides are, in general, known compounds and may be prepared by the methods disclosed in, "The synthesis of Biscitraconimides and Polybiscitraconimides," Galanti, A.V. and Scola, D.A., Journ. of Poly.
  • Base compounds were mixed in a Farrel Bridge BR 1.6 liter Banbury type internal mixer (preheating at 50°C, rotor speed 77 rpm, mixing time 6 min with full cooling).
  • Optimum cure time (t 90 ) is the time to 90% of delta torque above minimum
  • reversion time (t r 2) is the time to 2% of delta torque below maximum torque
  • Final torque (Tf) is the torque measured after the overcure time.
  • Sheets and test specimens were vulcanized by compression molding in a Fontyne TP-400 press.
  • Compression set was determined after 24 h at 70°C or 72 h at 23°C according to ASTM D 395-89.
  • Heat build-up temperature rise and compression set after dynamic loading were determined using a Goodrich Flexometer (load 1 MPa, stroke 0.445 cm, frequency 30 Hz, start temperature 100°C, running time 30 min; ASTM D 623-78). Blow out time was determined according to ASTM D 623-78 (load 2 MPa, stroke 0.645 cm, frequency 30 Hz, start temperature 100°C).
  • Abrasion was determined using a Zwick abrasion tester as volume loss per 40 m path travelled (DIN 53516).
  • Examples 1-3 and Comparative Example A are formulations for truck tire treads.
  • the components of each formulation are given in Table 1 and the physical and mechanical properties for different curing conditions are given in Tables 2a-2d.
  • the heat buildup and permanent set are given for different curing conditions in Tables 3a-3b.
  • Example 4 and Comparative Example B are also formulations for truck tire treads.
  • the components of each formulation are given in Table 4 and the physical and mechanical properties for different curing conditions are given in Tables 5a-5b.
  • the heat buildup and permanent set are given for different curing conditions in Tables 6a-6b.
  • Examples 5-7 and Comparative Examples C-D are formulations for off- the-road tire treads.
  • the components of each formulation are given in Table 7 and the physical and mechanical properties for different curing conditions are given in Tables 8a-8d.
  • the heat buildup and permanent set are given for different curing conditions in Tables 9-10.
  • Example 8 and Comparative Examples E-F are formulations for conveyor belts.
  • the components of each formulation are given in Table 11 and the physical and mechanical properties for different curing conditions are given in Tables 12a-12b.
  • the heat buildup and permanent set are given for different curing conditions in Table 13.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente invention concerne un pneu dans lequel au minimum une des parties de la bande de roulement de la couche armée de fils d'acier, des flancs et de la carcasse contient une composition caoutchouteuse formée par la vulcanisation d'un mélange de: a. caoutchouc naturel, polyisoprène ou leur mélange, b. caoutchouc butadiène, caoutchouc styrène-butadiène ou leur mélange, c. noir de carbone, d. activeur, e. oxyde de zinc, f. soufre ou donneur de soufre, et g. accélérateur de vulcanisation. L'invention est caractérisée par le fait que ladite composition caoutchouteuse possède une température de consolidation de 20 à 35 °C. Ces pneus présentent une ou plusieurs améliorations d'une grande variété de propriétés. La présente invention concerne aussi une courroie qui contient une telle composition caoutchouteuse, caractérisée par le fait que ladite composition caoutchouteuse possède une température de consolidation de 10 à 25 °C. Ces courroies présentent également une ou plusieurs améliorations de différentes propriétés.
EP92909444A 1991-10-29 1992-05-07 Compositions pour pneus et courroies Withdrawn EP0610197A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
WOPCT/EP91/02048 1991-10-29
PCT/EP1991/002048 WO1992007904A1 (fr) 1990-10-29 1991-10-29 Coagents antireversion utilises dans la vulcanisation du caoutchouc
PCT/EP1992/001030 WO1993009178A1 (fr) 1991-10-29 1992-05-07 Compositions pour pneus et courroies

Publications (1)

Publication Number Publication Date
EP0610197A1 true EP0610197A1 (fr) 1994-08-17

Family

ID=8165618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92909444A Withdrawn EP0610197A1 (fr) 1991-10-29 1992-05-07 Compositions pour pneus et courroies

Country Status (8)

Country Link
EP (1) EP0610197A1 (fr)
JP (1) JPH07500616A (fr)
BR (1) BR9206688A (fr)
CA (1) CA2122347A1 (fr)
CZ (1) CZ104794A3 (fr)
FI (1) FI941968A0 (fr)
SK (1) SK49694A3 (fr)
WO (1) WO1993009178A1 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5503940A (en) * 1994-10-24 1996-04-02 The Goodyear Tire & Rubber Company Elastomeric laminates containing a solventless elastomeric adhesive composition
US6186202B1 (en) 1996-02-20 2001-02-13 The Goodyear Tire & Rubber Company Silica reinforced solventless elastomeric adhesive compositions
US5728757A (en) * 1996-08-09 1998-03-17 The Goodyear Tire & Rubber Company Zinc salts of citraconamic acid and rubber compounds containing such salts
US5696188A (en) * 1996-08-09 1997-12-09 The Goodyear Tire & Rubber Company Rubber compounds containing aryl bis citraconamic acids
US6079468A (en) 1996-08-09 2000-06-27 The Goodyear Tire & Rubber Company Rubber article containing a bismaleimide and a bis benzothiazolydithio end capped compound
JP4678909B2 (ja) * 2000-02-01 2011-04-27 住友ゴム工業株式会社 ランフラットタイヤ
JP2001288298A (ja) * 2000-02-04 2001-10-16 Bridgestone Corp ゴム組成物及びそれを用いた空気入りタイヤ
KR20030095079A (ko) * 2002-06-11 2003-12-18 금호타이어 주식회사 내피로 특성이 향상된 타이어용 고무조성물
KR20030095080A (ko) * 2002-06-11 2003-12-18 금호타이어 주식회사 내피로 특성이 향상된 타이어용 고무조성물
US20060111498A1 (en) * 2004-11-23 2006-05-25 The Goodyear Tire & Rubber Company Rubber compound with hydrotalcite having increased blow-out resistance
JP2007169431A (ja) 2005-12-21 2007-07-05 Sumitomo Rubber Ind Ltd サイドウォール用ゴム組成物
US20070144644A1 (en) * 2005-12-22 2007-06-28 David John Zanzig Pneumatic tire
EP2584217A4 (fr) * 2010-06-15 2017-12-13 Bando Chemical Industries, Ltd. Courroie de transmission
US9879131B2 (en) 2012-08-31 2018-01-30 Soucy Techno Inc. Rubber compositions and uses thereof
CN102911412A (zh) * 2012-11-01 2013-02-06 中国化工橡胶桂林有限公司 全钢子午胎胎侧胶
WO2015054779A1 (fr) 2013-10-18 2015-04-23 Soucy Techno Inc. Compositions de caoutchouc et leurs utilisations
WO2015089647A1 (fr) 2013-12-19 2015-06-25 Soucy Techno Inc. Compositions de caoutchouc et leurs utilisations
JP6897144B2 (ja) * 2017-02-22 2021-06-30 横浜ゴム株式会社 コンベアベルト用ゴム組成物、コンベアベルト及びベルトコンベア

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071496A (en) * 1976-04-30 1978-01-31 Phillips Petroleum Company Carbon black for low-hysteresis rubber compositions
JPS5986641A (ja) * 1982-11-10 1984-05-18 Tokai Carbon Co Ltd ゴム組成物

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9309178A1 *

Also Published As

Publication number Publication date
JPH07500616A (ja) 1995-01-19
WO1993009178A1 (fr) 1993-05-13
FI941968A (fi) 1994-04-28
CA2122347A1 (fr) 1993-05-13
BR9206688A (pt) 1995-10-24
CZ104794A3 (en) 1994-11-16
SK49694A3 (en) 1994-11-09
FI941968A0 (fi) 1994-04-28

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