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AssigneeInstitut Francais du Petrole
InventorFrancois Dawans
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The invention relates to bituminous compositions obtained by the incorporation of thermoplastic polymer residues, particularly sterile car waste, containing polyurethane foams and thermoset resins, as well as their preparation process. The process consists of mixing previously ground polymer residues, so as to obtain an average particle size below 10 mm with melted asphalt or bitumen. The mixture is stirred at a temperature between 150.degree. and 300.degree. C., the presence of ground polyurethane foam and thermoset resin particles helping to increase the dissolving rate of the polymers. Preferably addition takes place of a catalyst and/or a reagent aiding a coupling reaction between the polymers and certain constituents of the bitumen or asphalt, which gives the final bituminous mixture improved properties. The bituminous compositions according to the invention can advantageously be used for coating solid materials.
In a process for obtaining a bituminous composition containing polymer waste, said process comprising mixing a bitumen or asphalt with a polymer waste, the improvement wherein said polymer waste consists essentially of thermoplastic polymers and sterile car waste having at least 4% by weight, based on the weight of said polymer waste, or polyurethane foams and at least 2% of thermoset resins other than polyurethane foams, wherein said sterile car waste is ground to a particle size of less than 10 mm and mixed, in an amount of 1-40% by weight based on the bitumen or asphalt, with molten bitumen or asphalt, adding to the mixture of the bitumen or asphalt and waste polymer 0.5 to 10% by weight of Lewis or Bronsted acid, based on the total weight of the polymers in the bitumen or asphalt, and wherein the mixture is heated at a temperature of 150.degree.-300.degree. C. for at least 5 minutes.
In a process for obtaining a bituminous composition containing polymer waste, said process comprising mixing a bitumen or asphalt with a polymer waste, the improvement wherein said polymer waste consists essentially of thermoplastic polymers and sterile car waste having at least 4% by weight, based on the weight of said polymer waste, of polyurethane foams and at least 2% of thermoset resins other than polyurethane foams, wherein said sterile car waste is ground to a particle size of less than 10 mm and mixed, in an amount of 1-40% by weight based on the bitumen or asphalt, with molten bitumen or asphalt, adding to the mixture of bitumen or asphalt and waste polymer 2 to 20% by weight of alkaline earth or alkali metal oxide, based on the total weight of the polymers in the bitumen or asphalt.
Dependencies are inferred from the claim text.