Eiffage Infrastructures

Eiffage Travaux Publics

Frédéric Loup

Jean-Pierre Antoine

Serge Krafft

Bernard Heritier

Gilles Sevin

Jean-Michel Grave

The aim of the invention is to provide, at a lower cost, novel primary mixtures that can be used for preparing polymer bitumens. For this purpose, the primary mixture according to the invention comprises: (a) at least 25% by weight, preferably 25 to 80% by weight, of polymer, (b) at least one thermoplastic tackifying resin having an average molecular mass of 100 to 3,000 g/mol, (c) and/or one or more mono-alkyl&#x2014;preferably methyl&#x2014;esters of fatty acids at C16-C18, in particular sunflower oil, linseed oil, rapeseed oil, soybean oil, and/or sunflower oil that is optionally isomerized; the ester (c) necessarily being present when the tackifying resin (b) has an acid value measured according to standard NF EN ISO 660 of less than 50 mg KOH/g. The invention also concerns the polymer bitumens, emulsions and coatings/coated products obtained from this primary mixture, as well as the methods for preparing same.

Polymer-bitumen primary mixtures that can be used for preparing polymer-bitumen binders, and products obtained from these primary mixtures

Disclosed is a bituminous composition in the form of granules, each granule including a core and a coating and having a mass for approximately one hundred particles of from 0.5 g to 2 g, the core including from 40 wt. % to 60 wt. % of a binder matrix; from 30 wt. % to 40 wt. % of a polymer; from 4 wt. % to 6 wt. % of a compatibilizing agent; and from 2 wt. % to 15 wt. % of an anti-adhesive filler; and the coating including an anti-sticking agent. The invention relates also to a method for preparing the composition, and to the use thereof in bitumen plants.

Bituminous composition in the form of granules and method for preparing same

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Villeurbanne, France

Frédéric Loup