SE368584

• Main Authors: OELSNER M,DT, BEHLING R,DT, ZENKE G,DT
• Format: Patent
• Language: English
• Published: 08.07.1974
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

1325847 Bituminous compositions BRITISH PETROLEUM CO Ltd 29 Feb 1972 [17 March 1971] 9284/72 Headings C3N and C3P A process for the production of a bituminous composition comprises blending 10-85% wt., based on the total mixture, of a bituminous substance; 5-25% wt., based on the total mixture, of a copolymer of one or more mono alpha olefins and a cyclic olefin having an endocyclic bridge and at least two olefinic double bonds; 10-85% wt., based on the total mixture, of an aromatic flux oil, and 0-4 parts by weight sulphur per 100 parts polymer, blowing the blend at 150-260‹ C. with a gas which contains elemental oxygen to form a concentrate and dissolving the concentrate in unblown bitumen. The bitumen is preferably a vacuum residue derived from a Venezuelan or Middle East crude oil and the copolymer is preferably a terpolymer of ethylene, propylene and dicyclopentadiene having a Mooney viscosity of 70. Suitable aromatic flux oils are "aromatic extracts" obtained by treating vacuum distillates and deasphalted vacuum residues with selected solvents. Suitably 10-50 parts by weight concentrate, preferably 25 parts, are dissolved in 100 parts by weight bitumen. The aromatic flux oil may be incorporated into the copolymer by milling at 90-150‹ C. and the mixture then added to molten bitumen in the blowing apparatus. The blowing of the concentrate is preferably carried out in two stages; the first stage at 180-230‹ C. and the second stage at 230-250‹ C. The blowing time is usually in the range 8-20 hours. The obtained concentrate is suitably incorporated into the unblown bitumen by agitation at a temperature of 170-200‹ C. In the examples the initial feedstock comprise 10% wt. terpolymer of ethylene, propylene and dicyclopentadiene, 30% wt. aromatic flux oil, 60% bitumen which may contain varying amounts of sulphur. The bitumen had a penetration of 185 mm./10 and a softening point of 41‹ C. 20 parts by weight of the blown material were then subsequently dissolved in 80 parts by weight bitumen.