Carbon blacks imparting superior treadwear/hysteresis performanc

Details Carbon blacks imparting superior treadwear/hysteresis performanc Carbon blacks imparting superior treadwear/hysteresis performanc

1992-06-24

1994-02-22

Langel, Wayne

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...

4234491, C09C 150

Patent

active

052887880

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a new class of new and novel furnace carbon blacks which are suitable for various applications and particularly well suited for use in rubber compositions.


BACKGROUND

Carbon blacks are generally produced in a furnace-type reactor by pyrolyzing a hydrocarbon feedstock with hot combustion gases to produce combustion products containing particulate carbon black.
Carbon blacks may be utilized as pigments, fillers, reinforcing agents and for a variety of other applications. For example, carbon blacks are widely utilized as fillers and reinforcing pigments in the compounding and preparation of rubber compositions. Most importantly, carbon blacks are effective in the preparation of rubber vulcanizates intended for usage in preparing tires.
It is generally desirable in the production of tires to utilize carbon blacks which produce tires with satisfactory abrasion resistance and hysteresis performance. The treadwear properties of a tire are related to abrasion resistance. The greater the abrasion resistance of a tire, the greater the number of miles the tire will last before wearing out. The hysteresis of a rubber compound means the difference between the energy applied to deform a rubber compound, and the energy released as the rubber compound recovers to its initial undeformed state. Tires with lower hysteresis values have reduced rolling resistance and therefore are able to reduce the fuel consumption of the vehicle utilizing the tire. Thus it is particularly desirable to produce carbon blacks capable of imparting greater abrasion resistance and lower hysteresis to tires.
Accordingly, one object of the present invention is the production of new carbon blacks which impart improved treadwear and hysteresis performance properties to natural rubbers, synthetic rubbers and blends of natural and synthetic rubbers incorporating the carbon blacks.
Another object of the present invention is new rubber compositions, advantageous for use as high performance tires, and particularly advantageous for use as passenger car tires, incorporating the new carbon blacks.
Other objects of the present invention will become apparent from the following description and the claims.


SUMMARY OF THE INVENTION

We have discovered a new class of carbon blacks having a CTAB of at least the iodine adsorption number (I.sub.2 No.) plus 5 m.sup.2 /g (CTAB.gtoreq.I.sub.2 No.+5 m.sup.2 /g), which CTAB is between at least 80 m.sup.2 /g and not greater than 105 m.sup.2 /g (105 m.sup.2 /g.gtoreq.CTAB.gtoreq.80m.sup.2 /g), a CDBP (crushed dibutyl phthlate number) of at least 104 cc/100 g (cubic centimeters per 100 grams) (CDBP.gtoreq.104 cc/100 g), a tint value, in %, of between about one-half CTAB plus 60, and about one-half CTAB plus 70 (0.5(CTAB)+70.gtoreq.Tint.gtoreq.0.5(CTAB)+60) and an ASTM aggregate volume of at least 480,000 (nm).sup.3 (ASTM aggregate volume.gtoreq.480,000 (nm).sup.3). Preferably the carbon blacks have a CDBP of between at least 104 cc/100 g and not greater than 120 cc/100 g (120 cc/100 g.gtoreq.CDBP .gtoreq.104 cc/100 g) and/or an ASTM aggregate volume of between at least 500,000 (nm).sup.3 and not greater than 600,000 (nm).sup.3 (600,000 (nm).sup.3 .gtoreq.ASTM aggregate volume.gtoreq.500,000 (nm).sup.3. We have also discovered a new aggregate volume.gtoreq.500,000 (nm).sup.3. We have also discovered a new class of rubber compositions containing these carbon blacks.
The carbon blacks of the present invention may be produced according to the process we have discovered or by a conventional process in a furnace carbon black reactor having a first (combustion) zone, a feedstock injection zone, and a reaction zone. The carbon blacks of the present invention described in Examples 3 and 4, herein, were produced in a furnace carbon black reactor having a stepped reaction zone, wherein the diameter of the portion of the reaction zone nearest the feedstock injection zone is smaller than the diameter of a portion of the reaction zone further downstream of the feedstock injectio

REFERENCES:
patent: 4540560 (1985-09-01), Henderson et al.
patent: 4908401 (1990-03-01), Ohara et al.

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