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US 2013/0296479 A1Published application
Rubber formulations including graphenic carbon particles
AssigneePPG Industries Ohio, Inc.
InventorsJustin J. Martin, Noel R. Vanier, Brian K. Rearick, Raphael O. Kollah, Timothy A. Okel, David Asay, Charles F. Kahle, Cheng-Hung Hung
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Abstract
Rubber formulations comprising a base rubber composition, graphenic carbon particles, and non-conductive filler particles such as silica are disclosed. The formulations possess favorable properties such as relatively low surface resistivities, and are useful for many applications such as tire treads.
Claims23
A curable rubber formulation comprising:
- a base rubber composition;
- from 0.1 to 20 weight percent grapnenic carbon particles having a 3D morphology;
- and
- from 1 to 50 weight percent of filler particles comprising silica, said graphenic carbon particles having been prepared by introducing (i) a hydrocarbon precursor material capable of forming a two-carbon fragment species, or (ii) methane into a thermal zone having a temperature of at least 1000° C., thereby to form graphenic carbon particles, and subsequently quenching and collecting the formed graphenic carbon particles, said graphenic carbon particles having an oxygen content of not more than 2 atomic weight percent, wherein the rubber formulation, when cured, has a surface resistivity of less than 1010 Ω/sq.
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A method of making a rubber composition comprising:
- (a) mixing (i) from 0.1 to 20 weight percent graphenic carbon particles having a 3D morphology and an oxygen content of not more than 2 atomic weight percent, (ii) from 1 to 50 weight percent filler particles comprising silica, and (iii) at least one additive chosen from processing oils, antioxidants, curatives and metal oxides with a base rubber composition;
- and
- (b) curing the mixture, wherein the cured rubber composition has a surface resistivity of less than 1010 Ω/sq
- said graphenic carbon particles having been prepared by introducing (i) a hydrocarbon precursor material capable of forming a two-carbon fragment species or (ii) methane into a thermal zone having a temperature of at least 1000° C., thereby to form graphenic carbon particles, and subsequently quenching and collecting the formed graphenic carbon particles.
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A curable rubber formulation comprising:
- a base rubber composition comprising styrene/butadiene rubber, butadiene rubber;
- natural rubber, functionalized derivatives thereof, and mixtures of such rubbers,
- from 1 to 15 weight percent graphenic carbon particles having a 3D morphology and an oxygen content of not more than 2 atomic weight percent;
- and
- from 1to 50 weight percent of filler particles comprising silica, said graphenic carbon particles having been prepared by introducing (i) a hydrocarbon precursor material capable of forming a two-carbon fragment species, or (ii) methane into a thermal zone having a temperature of at least 1000 thereby to form graphenic carbon particles, and subsequently quenching and collecting the formed graphenic carbon particles, wherein the rubber formulation, when cured, has a surface resistivity of less than 1010 Ω/sq.
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Dependencies are inferred from the claim text.