PROCESS FOR THE PREPARATION OF BITUMEN / POLYMER COMPOSITIONS HAVING VERY LOW THERMAL SUSCEPTIBILITY AND APPLICATION OF COMPOSITIONS OBTAINED FOR THE PRODUCTION OF BITUMEN / POLYMER BINDERS FOR COATINGS

摘要

These bitumen/polymer compositions are produced by contacting, between 100 DEG C and 230 DEG C under agitation, one bitumen or a mixture of bitumens with at least one olefinic polymer bearing epoxy or COOH groupings, then by incorporating in the product an acid additive while the whole mixture is agitated at a range between 100 DEG C and 230 DEG C for at least 10 minutes. The product, which is subjected to treatment by the acid additive may still contain one or several additional polymers, for instance of the elastomer type cross-linkable with sulphur, and even be subjected to sulphur cross-linking before the said treatment. The said bitumen/polymer compositions are useful, directly or after dilution, to form binders for carrying out surfacing operations.