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US 4,378,999 AGranted
Pulverulent bitumen concentrate and its use
AssigneeDegussa AG
InventorsKarl-Hans Muller, Walter Barthel
Life of this patent
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Abstract
Powdery bitumen concentrates are prepared containing 10 to 85 weight %, preferably 40 to 80 weight %, of synthetic silica. The concentrate is used in asphalt mixtures for building roads to give high stiffening value thereto.
Claims11
A powdery bitumen concentrate having 40 to 80% of synthetic silica wherein the synthetic silica is precipitated silica having a BET surface area of 120 to 500 m.sup.2 /g or pyrogenically produced silica having a BET surface area of 100 to 400 m.sup.2 /g.
Dependencies are inferred from the claim text.