Process for preparing bitumen/functionalized elastomer...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 95/00 (2006.01) C08G 81/02 (2006.01) C08J 3/20 (2006.01) C08K 5/36 (2006.01) C08L 15/00 (2006.01) C10C 3/02 (2006.01)

Patent

CA 2258801

A bitumen, an elastomer, a functionalization agent and possibly a peroxide compound are brought into contact and agitated between 100 degrees and 230 degrees C. The functionalization agent is a thiol carboxylic acid polyester or a reaction product of a thiol carboxylic acid or ester and ethylene sulphur. The functionalized elastomer can also be pre-formed, then incorporated into the bitumen. The compositions obtained are useable, directly or after dilution, to form bituminous binders to make pavements, coatings and waterproof coatings.

On met en contact, entre 100 °C et 230 °C et sous agitation, un bitume, un élastomère, un agent de fonctionnalisation et éventuellement un composé peroxydé. L'agent de fonctionnalisation est un polyester d'acide thiolcarboxylique ou un produit de réaction d'un acide ou ester thiolcarboxylique avec le sulfure d'éthylène. L'élastomère fonctionnalisé peut être également préformé, puis incorporé au bitume. Les compositions obtenues sont utilisables, directement ou après dilution, pour former des liants bitumineux pour la réalisation de revêtements routiers, d'enrobés et de revêtements d'étanchéité.

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