Institut Francais Du Pe'trole

Total Raffinage Distribution S.a.

Jacques Nicaud

Jacques Jarrin

Guy Lemoine

Bituminous compositions of the bitumen-polymer type, in homogenous phase, contain at least one bitumen base and are prepared from at least one polymer of the thermoplastic polyolefin type. These compositions have a thermoplastic polyolefin content of at least 1% by weight of which the crystallinity rate is greater than or equal to 30%, a melting temperature greater than or equal to 110.degree. C. and a penetrability at 25.degree. C. less than or equal to 300 tenths of a millimeter.

Bituminous compositions prepared from thermoplastic polyolefins and

A process for degrading thermoplastic polyolefins, in particular high or medium density polyethylenes, uses as a catalyst a mineral solid containing copper or a mineral solid containing aluminium and silicon and with an acid nature, at a temperature of 200.degree. C. to 450.degree. C., degradation being accompanied by incorporation of the degradation products into a heavy hydrocarbon such as a bitumen base. Incorporating degraded thermoplastic polyolefins, in particular degraded high or medium density polyethylenes, into heavy hydrocarbons can produce compositions with industrial and road applications.

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Nanterre, France

Jacques Nicaud