Ergon has filed a patent for a modified asphalt composition that utilizes pyrolyzed oil fractions from waste tire pyrolysis. The process involves pyrolyzing rubber articles or particles to obtain a pyrolyzed oil fraction with reduced polycyclic aromatic hydrocarbon (PAH) compounds. This translucent pyrolyzed oil fraction can then be combined with an asphaltic binder to create the modified asphalt composition. GlobalData’s report on Ergon gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Ergon, sustainable bituminous compositions was a key innovation area identified from patents. Ergon's grant share as of September 2023 was 49%. Grant share is based on the ratio of number of grants to total number of patents.
Modified asphalt composition using pyrolyzed oil fraction from waste tires
A recently filed patent (Publication Number: US20230272220A1) describes a modified asphalt composition that is made by combining an asphaltic binder with a reduced-PAH pyrolyzed oil fraction. The pyrolyzed oil fraction is obtained by partially pyrolyzing whole rubber articles or size-reduced rubber particles, and then removing some polycyclic aromatic hydrocarbon (PAH) compounds from the fraction. The patent claims that the modified asphalt composition has several desirable properties.
According to the patent claims, the PAH compounds can be removed from the pyrolyzed oil fraction through various methods such as fractionally distilling the oil fraction over a temperature range, solvent extracting the oil fraction, centrifuging the oil fraction, or wiped film evaporation. The goal is to achieve a reduced-PAH pyrolyzed oil fraction with a total PAH content of less than about 100 ppm by weight and a total concentration of specific PAH compounds below certain thresholds.
The reduced-PAH pyrolyzed oil fraction is then combined with the asphaltic binder to create the modified asphalt composition. The patent claims that the composition can contain between 0.5 wt. % and 30 wt. % of the reduced-PAH pyrolyzed oil fraction, based on the combined weight of oil and binder. The composition can also include synthetic polymers to further modify the asphalt.
The modified asphalt composition can be used in various applications, including as an asphalt emulsion for pavement construction or maintenance. The patent claims that the composition can be used as a pavement maintenance binder, with a temperature range of 250 to 325° C, and can provide a sealed skid resistant surface when combined with a layer of aggregate chips.
Additionally, the patent claims that the modified asphalt composition can be used in asphalt paving mixtures, where it is combined with aggregate to create a durable and high-performance pavement.
Overall, the patent describes a modified asphalt composition that is made by combining an asphaltic binder with a reduced-PAH pyrolyzed oil fraction. The composition has reduced levels of PAH compounds and can be used in various applications, including pavement construction and maintenance.