Process for the preparation of stable mixtures of bitumen...

Details Process for the preparation of stable mixtures of bitumen... Process for the preparation of stable mixtures of bitumen...

C - Chemistry, Metallurgy

08

L

C08L 95/00 (2006.01) C08J 3/00 (2006.01) C08L 53/02 (2006.01) E01C 7/26 (2006.01)

Patent

CA 2164177

Mixtures of bitumen and thermoplastic polymer stable to storage are prepared by a process comprising: (i) mixing a bituminous product having a content of total asphaltenes, resins, saturated and aromatic products which satisfies the condition that the I value is between 0.200 c and 0.270 in the expression: I c = (C7+C5+S)/(A+R) with a thermoplastic polymer, the reaction being carried out at a temperature of between 160°C and 200°C and for a time of between 15 and 120 minutes and (ii) diluting the bituminous composition obtained in (i) with a bitumen or bituminous component having an I c defined as specified above in (i) of between 0.270 and 0.700 in such a quantity that the final concentration of the polymer is between 2.5 and 15% by weight, and heating to a temperature of between 160°C and 200°C for a time of between 30 and 90 minutes.

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