Patent ID: 6852779

Claim:
A method for preparing a cross-linked and/or functionalized bitumen/polymer composition having a low susceptibility to temperature, comprising; forming, at temperatures in the range between 100° C. and 230° C., and under agitation, a homogenous mass comprising a bituminous matrix in which is uniformly dispersed a precursor elastomer, and cross-linking and/or functionalizing said precursor elastomer to form said cross-linked and/or functionalized bitumen/polymer composition, wherein said precursor elastomer is used in a quantity of between 0.5% and 30% of the weight of the bituminous matrix, and said bituminous matrix is made by associating, by weight, x % of a non oxidized bitumen with a penetrability of between 20 and 900 and y % of an oxidized bitumen, with a penetrability of between 10 and 90, where said penetrabilities are determined as set forth the in NF standard T 66004 and are expressed in {fraction (1/10)} mm, where the values of x and y are such that 20≦x≦95 and 5≦y≦80 with x+y=100.