Bitumen composition and use thereof

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 95/00 (2006.01)

Patent

CA 2668345

Bitumen composition for built structure seals, especially roofing membranes, based on plastomer bitumen are very soft at high temperatures because they possess a poor tread resistance, while such bitumen compositions have a low flexibility at low temperatures. Therefore, known bitumen compositions have to be provided with a comparatively large amount of APP, APAO or IPP. Through the addition only of small amounts of high-boiling saturated hydrocarbons (flux oil) and paraffins, the invention achieves elimination of the disadvantages of plastomer bitumen, without the proportion of expensive APP, APAO or IPP having to be increased for this purpose.

Les compositions bitumineuses destinées à étanchéifier les bâtiments, en particulier les bandes d'étanchéité pour toitures, à base de bitume plastomère sont très molles à haute température et elles ont de ce fait une mauvaise résistance à l'usure par passage tandis que, à basse température, ces compositions bitumineuses présentent une flexibilité minime. C'est pourquoi les compositions bitumineuses connues doivent incorporer une quantité relativement importante de polypropylène atactique (APP), de poly-alpha-oléfines atactiques (APAO) ou de polypropylène isotactique (IPP). Grâce à l'ajout de quantités minimes d'hydrocarbures saturés à haut point d'ébullition (huile de fluxage) et de paraffines, l'invention permet de supprimer les inconvénients du bitume plastomère sans qu'il soit nécessaire pour cela d'augmenter la proportion d'APP, APAO ou IPP coûteux.

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