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Antioxidant treatment of asphalt binders

Title: Antioxidant treatment of asphalt binders.
Abstract: A combination of antioxidants and method of incorporating the antioxidants into an asphalt binder to make a modified asphalt binder are described. The antioxidants comprise a thioester and an aldehyde. The aldehyde and thioester, in a ratio between about 1:100 and about 100:1, are added to an asphalt binder. An acidic catalyst is also added in a concentration between about 0.1 wt % and about 18 wt % of the asphalt binder. The antioxidants, asphalt binder, and catalyst are mixed at a temperature between about 85° C. and about 135° C. for a time between about 30 minutes and about 6 hours. The antioxidants are capable of improving the performance grade of the asphalt binder. The modified asphalt binder possesses superior resistance to oxidative age hardening compared to other modified asphalt binder compositions that incorporate various antioxidants. ...

- Chicago, IL, US
Inventors: Alex K. Apeagyei, William G. Buttlar, Barry J. Dempsey
USPTO Applicaton #: #20080210126 - Class: $ApplicationNatlClass (USPTO) -

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The Patent Description & Claims data below is from USPTO Patent Application 20080210126, Antioxidant treatment of asphalt binders.

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US 20080210126 A1
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