Abstract: A process for the production of a binder modified with thermoplastic synthetic material and a modified binder for building materials, especially road construction type materials are provided, in which for the formation of the binder, molten bitumen together with a thermoplastic material mixture, preferably an olefin polymer, are subjected to a homogenization treatment. The mixture containing bitumen and the thermoplastic material is rapidly accelerated followed by rapid braking. By this acceleration there is supplied to the mixture containing the bitumen and a thermoplastic material, in the form of kinetic energy, an amount of energy corresponding to the difference between the treatment temperature and the disintegration temperature of the thermoplastic material to form readily reacting molecular fragments of the thermoplastic material.

Abstract: Process for the production of a binder modified with synthetic material for building materials, especially street-building material, in which for the formation of the binder, molten bitumen together with a thermoplast or a thermoplast mixture, preferably an olefin polymer, is subjected to a homogenization treatment. To the mixture containing the bitumen and a thermoplast or a thermoplast mixture, there is supplied in the form of kinetic energy an amount of energy corresponding to the difference between the treatment temperature and the disintegration temperature of the thermoplast or thermoplast mixture to form readily reacting molecular fragments of the thermoplast or thermoplast mixture. Preferably, the mixture containing bitumen and the thermoplast or a thermoplast mixture is driven through a narrow gap between two mixing tools standing opposite to one another and rotating relatively to one another.

Abstract: A method for producing a finely distributed powder, which contains a thermoplastic synthetic material, where, in order to form particles containing the synthetic material, thermoplastic synthetic material is introduced in a non-aqueous carrier substance, which is liquid in the melting temperature range of the synthetic material, and is mixed in the melting temperature range with the carrier substance, and ground lime is then added to this mass, and thereafter an aqueous slurry is added to the mass. By the reaction between the lime and the aqueous slurry, the mass is converted to a powder containing synthetic material, More particularly,bitumen is selected as a carrier substance. The powder can preferably be introduced to produce a synthetic material-containing bituminous binder for building materials.