Bituminous compositions and preparation thereof

Details Bituminous compositions and preparation thereof Bituminous compositions and preparation thereof

C - Chemistry, Metallurgy

08

L

400/1609

C08L 95/00 (2006.01)

Patent

CA 1262976

ABSTRACT BITUMINOUS COMPOSITIONS AND PREPARATION THEREOF A road surface dressing composition is made by (a) blending together at a temperature of 140 to 200°C, (i) a bitumen fluxed with a petroleum derived aromatic oil to a penetration of over 220 (mm/10), (ii) a styrene-butadiene copolymer; (b) mixing the resultant blend for at least 10 minutes at a temperature of 150 to 190°C with 0.01 to 0.6% of sulfur based on the weight of the bitumen content of the said fluxed bitumen; and (c) mixing the resultant product at a temperature of 125 to 150°C with a light fluxant, preferably hydrocarbonaceous, to decrease the final viscosity of the composition to a required value.

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