RADIAL AND BRANCHED BLOCK COPOLYMERS, COMPOSITIONS WHICH CONTAIN, THEM, THEIR PREPARATION AND THEIR USE IN BITUMINOUS COMPOSITIONS

摘要

1.CASE 2414"RADIAL AND BRANCHED BLOCK COPOLYMERS, COMPOSITIONS WHICHCONTAIN THEM, THEIR PREPARATION AND THEIR USE INBITUMINOUS COMPOSITIONS"AbstractRadial and branched block copolymers show astructure:wherein: Z is a radical deriving from atetrafunctional coupling agent;A is a polystyrene block;B is a polybutadiene blockm, n, p, g are either 1 or zero, with thecondition that their sum is comprisedwithin the range of from 1 to 4.Compositions of block copolymers comprise thehereinabove disclosed radial and branched blockcopolymers, blended with a two-block copolymer B-A, andan "A" homopolymer.The process for the preparation of said radial andbranched block copolymers and of the related compositions2.is disclosed, and furthermore their use is disclosed inbituminous compositions, in order to improve the generalcharacteristics of the bitumens.