Additive dispersing asphaltenes and its uses

Use of an alkylphenol-aldehyde resin modified with at least one alkyl amine in a composition of crude oil or a product derived from a composition of crude oils as an additive dispersing aphaltenes. A process for treating a composition of crude oils or a derivative, which prevents the precipitation of asphaltenes, particularly in crude oils and products derived therefrom by refining processes and / or extraction. Bituminous compositions comprising an alkylphenol-aldehyde resin modified with at least one alkylamine.