POLYMER MODIFIED BITUMEN (PMB)

摘要

A polymer-modified bitumen (PmB) having improved elastic restoration prepared by blending from 0.5-20 wt. % of a polymer material in bitumen, said polymer additive, which may be comprised of various polymers, being comprised of from 20-100 wt. % of a polyalkyl (meth)acrylate comprising monomer units as follows: 50-100 wt. % of alkyl (meth)acrylates containing alkyl groups of 8-26 C atoms; 0-30 wt. % of alkyl (meth)acrylates containing alkyl groups of 1-7 C atoms; and 0-20 wt. % of other monomers, optionally containing functional groups; and said polymer having a molecular weight Mw > 1,000,000, corresponding to a viscosity number nsp/c > 120 ml/g as measured in chloroform at 20.degree.C.