Polymer-modified bitumen mass for a bituminous cover layer of a roofing sheet, bituminous roofing sheet and completely recycle roofing sheet

摘要

The invention relates to a polymer-modified bitumen - mass (pmb) for a bituminous cover layer of a roofing sheet, predominantly consisting of a "straight-run bitumens" with a, properties of the "straight-run bitumens" modifying, fillers - proportion of a synthetic rubber in the form of sbs (styrene - butadiene - styrene), wherein a further modifying additive in the form of a polymer is present, wherein the further modified by the additive sbs - modified bitumens - mass, properties of a softening point and a penetration, is provided according to the invention, that the polyethylene in a proportion of from 2.5 w -% to 7.5 w -% is present; and a softening point of between 70°C. and 170°C, and a penetration value between 99 and 30 1 / 10 mm.