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US 12,258,461 B2Granted
Bitumen product
AssigneeOmya International AG
InventorHartmut Kremer
Life of this patent
Estimating the term…
Abstract
A bitumen product including bitumen and a mineral filler. In order to reduce the specific weight of the bitumen product while allowing sufficient scaling effect, the mineral filler contains expanded perlite grains, the expanded perlite grains having a closed-cell surface, and the expanded perlite grains having a closed-cell surface are not ground.
Claims7
A bitumen product comprising bitumen as well as a mineral filler, wherein the mineral filler comprises expanded perlite grains, which expanded perlite grains have a closed-cell surface, and expanded perlite grains, which expanded perlite grains have an open-cell surface,
- wherein a proportion of expanded perlite grains having a closed-cell surface is greater in % by weight than a proportion of expanded perlite grains having an open-cell surface,
- wherein the expanded perlite grains with closed-cell surface are unground,
- wherein the expanded perlite grains with closed-cell surface have a bulk density of between 90 kg/m3 and 550 kg/m3,
- wherein the expanded perlite grains with closed-cell surface have a particle size of between 5 μm and 2000 μm, and
- wherein the expanded perlite grains with closed-cell surface are present in amounts of between 1 wt. % and 20 wt. %.
2 more elements
Dependencies are inferred from the claim text.