RUBBER COMPOSITION AND A TIRE COMPRISING A RUBBER COMPOSITION

Abstract

A rubber composition comprising 50 phr to 100 phr of a styrene butadiene rubber; 0 phr to 50 phr of at least one diene based rubber; 95 phr to 200 phr of filler comprising i) 50 phr to 100 phr of silica, ii) 40 phr to 70 phr of carbon black and iii) 5 phr to 30 phr of an inorganic metal hydroxide; 40 phr to 80 phr of plasticizer comprising a hydrocarbon resin having a softening point within a range of 80° C. and 130° C.

Claims

1. A rubber composition comprising: 50 phr to 100 phr of a styrene butadiene rubber; 0 phr to 50 phr of at least one diene based rubber; 95 phr to 200 phr of filler comprising: i) 50 phr to 100 phr of silica, ii) 40 phr to 70 phr of carbon black, and iii) 5 phr to 30 phr of an inorganic metal hydroxide; 40 phr to 80 phr of plasticizer comprising a hydrocarbon resin having a softening point within a range of 80° C. to 130° C.

2. The rubber composition of claim 1, wherein the filler comprises one or more of: from 50 phr to 80 phr of the silica, from 45 phr to 65 phr of carbon black, and from 10 phr to 25 phr of the inorganic metal hydroxide.

3. The rubber composition of claim 1, wherein the inorganic metal hydroxide is aluminum hydroxide.

4. The rubber composition of claim 1, wherein the rubber composition comprises from 100 to 150 phr of the filler.

5. The rubber composition of claim 1, wherein the plasticizer comprises from 20 phr to 65 phr of oil.

6. The rubber composition of claim 1, wherein the rubber composition comprises from 15 phr to 60 phr of the hydrocarbon resin.

7. The rubber composition of claim 1, wherein the rubber composition comprises from 15 phr to 35 phr of the hydrocarbon resin and from 25 phr to 50 phr of oil.

8. The rubber composition of claim 1, wherein the hydrocarbon resin is selected from one or more of: coumarone-indene resin, petroleum hydrocarbon resin, terpene resin, styrene/alphamethylstyrene resin, terpene phenol resin, and copolymers and/or mixtures thereof.

9. The rubber composition of claim 1, further comprising from 5 phr to 15 phr of gum rosin.

10. The rubber composition of claim 1, further comprising from 3 phr to 9 phr of 3-(octanoylthio)-1-propyltriethoxysilane.

11. The rubber composition of claim 1, wherein the silica has a BET surface area of at least 185 m.sup.2/g.

12. The rubber composition of claim 1, wherein the carbon black has an iodine absorption number of at least 180 g/kg.

13. The rubber composition of claim 1, further comprising a diene based rubber chosen from natural rubber, synthetic polyisoprene, polybutadiene rubber, and another styrene butadiene rubber.

14. The rubber composition of claim 1, wherein the styrene butadiene rubber has a glass transition temperature within a range of −20° C. and −49° C. and wherein the further diene based rubber comprised in the rubber composition has a glass transition temperature within a range of −51° C. and −110° C.

15. The rubber composition of claim 14, wherein the styrene butadiene rubber is a solution polymerized styrene butadiene rubber having a glass transition temperature within a range of −20° C. and −45° C. and the rubber composition comprises from 70 phr to 95 phr of the solution polymerized styrene butadiene rubber, and wherein the rubber composition comprises from 5 phr to 30 phr of the at least one diene based rubber which is selected from at least one or more of natural rubber, synthetic polyisoprene, polybutadiene rubber and another styrene butadiene rubber.

16. The rubber composition of claim 15, wherein the further diene based rubber comprised in the rubber composition comprises a polybutadiene having a glass transition temperature within a range of −100° C. to −110° C.

17. The rubber composition of claim 1, comprising from 3 phr to 10 phr of a vegetable oil having a glass transition temperature of less than −90° C. and from 20 to 40 phr of a mineral oil.

18. A tire comprising the rubber composition of claim 1.

19. The tire according to claim 18, wherein the tire has a tread comprising the rubber composition.

20. The tire according to claim 19, wherein the tire is a passenger car tire showing a speed index of “W”, “Y”, or “(Y)” on a lateral side of the tire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0070] Below Table 1 shows a non-limiting Inventive Example in accordance with an embodiment of the present invention and a Comparative Example which is not in accordance with the present invention.

TABLE-US-00001 TABLE 1 Amount in phr Comparative Inventive Ingredient Example Example SBR 1.sup.1 50 90 SBR 2.sup.2 40 0 BR 1.sup.3 10 0 BR 2.sup.4 0 10 Silica 1.sup.5 56 0 Silica 2.sup.6 0 65 Carbon Black 1.sup.7 62 0 Carbon Black 2.sup.8 0 55 Metal hydroxide.sup.9 0 15 Oil 1 .sup.10 44 34 Vegetable Oil 2.sup.11 0 5 Silane 1 .sup.12 4 0 Silane 2.sup.13 0 6.5 Liquid plasticizer 1 .sup.14 12 0 Resin 1 .sup.15 10 0 Resin 2.sup.16 0 23 Tackifyer.sup.17 0 3 Rosins .sup.18 5 8 Zink Oxide 2.5 1 Waxes 1.5 2 Antidegradants.sup.19 5 5 Processing Aids.sup.20 3 4 Accelerators.sup.21 4.3 4.6 Sulfur 1.9 1.2 .sup.1Styrene butadiene rubber as Sprintan ™ SLR 6430 from Trinseo, having a glass transition temperature of about −29° C. and a bound styrene content of 40%; extension oil listed separately .sup.2Styrene butadiene rubber as Tufdene ™ E680 from Asahi, having a glass transition temperature of about −13° C.; extension oil listed separately .sup.3Polybutadiene rubber as Budene ™ 1207 from Goodyear, having a glass transition temperature of about −110° C. .sup.4Polybutadiene rubber as Budene ™ 1223 from Goodyear, having a glass transition temperature of about −108° C. .sup.5as Zeosil ™ 1165 MP from Solvay, with a BET surface area of about 160 m.sup.2/g .sup.6as Zeosil ™ Premium 200 MP from Solvay, with a BET surface area of more than 215 m.sup.2/g. .sup.7Carbon Black having an iodine absorption number of more than 190 g/kg .sup.8Carbon Black having an iodine absorption number of more than 190 g/kg .sup.9Aluminum hydroxide having a surface area of about 4 m.sup.2/g, as Hydral ™ 710 from Huber .sup.10 Mineral oil, including extension oil .sup.11Sunflower oil .sup.12 Bis-triethoxysilylpropyl disulfide as SI 266 from Evonik .sup.133-Octanoylthio-1-propyltriethoxysilane as NXT ™ from Momentive .sup.14 Liquid SBR as Ricon ™ 100 from Cray Valley .sup.15 Alpha methyl styrene resin having a softening point of 85° C. and a weight average molecular weight Mw of about 1150 g/mol .sup.16C9 modified and hydrogenated dicyclopentadiene resin, as Oppera ™ 383 from Exxon Mobil .sup.17Tackifier as SP 1068 from Akrochem .sup.18 Gum rosins .sup.19Phenylene diamine and dihydroquinoline types .sup.20Zinc soaps of fatty acids and stearic acid derivatives .sup.21including DPG, CBS, BDBzTH

[0071] The compositions of Table 1 have been tested as tire tread compounds with the results shown below in Table 2. All tests have been carried out on the same passenger car vehicle and under the same test conditions. The test results have been normalized to the results of the tires having treads with the rubber composition of the Comparative Example, wherein higher values are better than lower values.

TABLE-US-00002 TABLE 2 Comparative Inventive Property/Performance Example Example Wet braking performance 100 102.8 Wet handling performance 100 103.9 Dry handling performance 100 101.6 Treadwear 100 100 Rolling resistance performance 100 104.1

[0072] As shown in Table 2 above, wet braking and wet handling performance and even dry handling performance have been improved in the Inventive Example compared to the Comparative Example. Remarkably, also rolling resistance has been reduced compared to the tire comprising the Comparative Example. The tread wear of the Inventive Example has at least been limited to the level of the Comparative Example.

[0073] Variations in the present invention are possible in light of the description of it provided herein. While certain representative embodiments and details have been shown for the purpose of illustrating the subject invention, it will be apparent to those skilled in this art that various changes and modifications can be made therein without departing from the scope of the subject invention. It is, therefore, to be understood that changes can be made in the particular embodiments described which will be within the full intended scope of the invention as defined by the following appended claims.