Patent ID: 7918930
Filing Date: 2011-04-05
Classification: C08K,C08L,C10C

Abstract:
1. Process for the preparation of a “blown type” bitumen base comprising the following essential stages: a) a bitumen is introduced into a receptacle equipped with stirring means, and the bitumen is raised to a temperature of 120° C. to 300° C., b) at least one chemical blowing additive is introduced into the receptacle, and mixing is carried out, said chemical blowing additive having the following general formula: where Ar1 and Ar2 represent independently of each other a benzene ring or a system of condensed aromatic rings of 6 to 20 carbon atoms, substituted by at least one hydroxyl group, and R represents an optionally substituted divalent radical, of which the principal chain comprises from 6 to 20 carbon atoms and at least one amide and/or ester group, wherein the chemical blowing additive is from 0.4% to 5.0% by weight relative to the weight of bitumen.