| 摘要 |
A polymer modified bitumen composition, comprising 80 to 98.5 parts by weight of a bitumen and 20 to 1.5 parts by weight of a polymer composition, wherein the polymer composition comprises: (i) from 5 to 70% by weight of a linear styrenic block copolymer (SBC1) comprising at least two polymer blocks each substantially made of an aromatic vinyl compound and at least one polymer block substantially made of a conjugated diene compound and having an apparent molecular weight greater than 250,000 and/or a radial styrenic block copolymer (SBC2) having three or more polymer arms attached to the residue of a cross-linking agent or multifunctional compound, comprising at least two polymer blocks each substantially made of an aromatic vinyl compound and at least one polymer block substantially made of a conjugated diene compound and wherein the polymer arms have an average apparent molecular weight greater than 125,000 and (ii) from 95 to 30% by weight of an elastomer (EI) having an apparent molecular weight in the range of 120,000 to 250,000; their use as asphalt binder or as bituminous roofing composition, hot mix asphalt compositions comprising aggregate material and pavements comprising the compacted hot mix asphalt, easy welding roll roofing membranes, comprising said bitumen roofing composition, and specific block copolymers to be used in said bitumen composition. |
