Akzo Nobel N.v.

Bengt-Arne Thorstensson

Alan Duncan James

Julia Mary Wates

Thomas Wallin

Christos Edengrim

Leif-Göran Ståhlgren

Keith Shaw

According to the invention, a slow setting bitumen-aggregate mix for cold paving is manufactured by a) preparing a cationic oil-in-water emulsion of bitumen in the presence of an emulsifier containing i) a tertiary polyamine selected from the group consisting of a di(C-Calkylene)triamine, a tri(C-Calkylene)tetraamine, a tetra(C-Calkylene)pentaamine, a penta(C-Calkylene)hexaamine, a hexa(CCalkylene)heptaamine or a mixture thereof, which amine compounds have only tertiary amine groups and contain one or two aliphatic groups with 8-22 carbon atoms, bound to a nitrogen atom, while the remaining nitrogen substituents are methyl groups and ii) an acid present in such an amount that the aqueous emulsion obtains a pH value from 1-6, preferably 1.5-5, and b) mixing the aqueous emulsion obtained with a solid aggregate. The present invention also comprises a tertiary polyamine selected from said group of tertiary polyamines or a salt thereof with an acid, a process for the production of said tertiary amine, as well as the use of the tertiary polyamine salt as an emulsifying or cohesion increasing agent.

Process for the manufacture of a bitumen-aggregate mix suitable for road paving and a polyamine compound and its use

The present invention relates to an aqueous quick-setting bitumen-aggregate mix suitable for cold pavement of roads, parking places, sidewalks and the like. The bitumen-aggregate mix is manufactured by mixing a mineral aggregate, water, a de-emulsifier, containing hydraulic cement, and a cationic oil-in-water bitumen emulsion, containing, as an emulsifier, a salt of a tertiary diamine and a phosphoric acid. The diamine has the formula (I), where one or two of the groups R, R, Rand Rdesignate a hydrocarbon group of 6&#x2013;22, preferably 8&#x2013;20 carbon atoms, and the remaining R, R, Rand Rgroups are an alkyl group with 1&#x2013;4 carbon atoms, and/or a group &#x2014;(A)H, where A is an alkyleneoxy group with 2&#x2013;3 carbon atoms, and s is a number from 1&#x2013;4, Ris an alkylene group with 2&#x2013;4 carbon atoms and n is a number from 0&#x2013;2.

Process for the manufacture of a bitumen-aggregate mix suitable for road pavement

A method of emulsifying asphalt using a polyamine polyoxide, preferably a diamine dioxide, as an emulsifier or co-emulsifier and an emulsion of asphalt, water and a polyamine polyoxide, preferably a diamine dioxide. The advantages of using a polyamine polyoxide as an emulsifier or co-emulsifier include its ability to provide superior cationic and anionic emulsions, and slow-setting emulsions at low use levels, and the excellent adhesion of the cured asphalt film.

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Ytterby, Sweden

Bengt-Arne Thorstensson