Carbon black/rubber composition

Details Carbon black/rubber composition Carbon black/rubber composition

1995-09-18

1997-06-17

Szekely, Peter A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524495, C08K 304

Patent

active

056398174

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a new rubber composition in which carbon black is incorporated. In particular, the invention relates to a carbon black/rubber composition for use in tyre treads.
Carbon black plays a critical role in tyre compositions. The differences in carbon black properties have a strong influence on important features of a rubber composition for tyres, such as abrasion and heat build-up. For this reason, particularly in high performance tyres and tyres for high stress conditions, different carbon black/rubber compositions are used for the tyre tread and for the tyre wall.
U.S. Pat. No. 4,782,927 describes a rubber composition for low rolling resistance and high wet skid resistance.
DE-34 26 864 discloses a rubber composition for tyre treads having a relatively low energy loss.
An object of this invention is to provide a new carbon black/rubber composition.
A further object of this invention is to provide a carbon black/rubber composition which allows control of properties of tyre compositions by mixing such a carbon black/rubber composition into tyre compositions.
Furthermore, a further object of this invention is to provide a new carbon black which, owing to its properties in carbon black/rubber compositions, allows a particularly advantageous "tailoring" of the properties of such carbon black/rubber compositions, namely by mixing the new carbon black/rubber composition into other rubber compositions.
This invention provides a new carbon black/rubber composition as defined in the claims.
In particular, the carbon black in the composition of this invention has the following properties: from 30 to 100 m.sup.2 /g, preferably from 40 to 80 m.sup.2 /g; ml/100 g; ml/100 g;
where, furthermore, when the carbon black is incorporated in a standard carbon black/rubber composition of this invention and the composition is vulcanized in accordance with ASTMD-3191 at 155.degree. C. at t.sub.90, this standard carbon black/rubber composition has the following features:


______________________________________ a) tan .delta. (1 Hz) at -22.degree. C. > 0.320 preferably > 0.340 18.degree. C. 0.140 to 0.200 preferably 0.150 to 0.180 58.degree. C. 0.100 to 0.140 preferably 0.110 to 0.130 98.degree. C. < 0.090 preferably < 0.085 ##STR1## minimum 0.76; b) tan .delta. (10 Hz) at -22.degree. C. > 0.550 preferably > 0.570 18.degree. C. 0.130 to 0.200 preferably 0.160 to 0.185 58.degree. C. 0.110 to 0.160 preferably 0.130 to 0.150 98.degree. C. < 0.110 preferably < 0.100 ##STR2## minimum 0.83; c) G* (1 Hz) at -22.degree. C. 8 to 16 preferably 9 to 12 18.degree. C. 3.5 to 7.0 preferably 4 to 5.5 58.degree. C. 3 to 7.0 preferably 3 to 4.5 98.degree. C. 2.5 to 5.0 preferably 2.8 to 4.0 G* (-22.degree. C.)-G* (98.degree. C.); maximum 8; d) G* (10 Hz) at -22.degree. C. 14 to 21 preferably 15 to 18 18.degree. C. 4 to 8 preferably 4.5 to 6 58.degree. C. 3 to 6 preferably 3.4 to 4.8 98.degree. C. 3 to 5.5 preferably 3 to 4.5 G* (-22.degree. C.)-G* (98.degree. C.); maximum 14. ______________________________________
The above properties are determined in accordance with the following methods:


______________________________________ nitrogen surface area ASTM D-3037 CTAB surface area ASTM D-3765 DBP ASTM D-2414 24M4-DBP ASTM D-3493 tan .delta. vulcanized in ASTM D3191 at 155.degree. C. at t.sub.90 G* vulcanized in ASTM D3191 at 155.degree. C. at t.sub.90. ______________________________________
Tan .delta. and G* were measured on a Rheometrix RDA 700 using the following parameters:


______________________________________ specimen shape: strips deformation: torsion deformation amplitude: 2% temperatures: -20.degree. C., 20.degree. C., 60.degree. C., 100.degree. C. frequency: 0.1-100 Rad/s (radians/s) ______________________________________
The preferred carbon black of this invention possesses large aggregates which preferably have a branched or chain-like structure (cf. accompanying S

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