C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 95/00 (2006.01)
Patent
CA 2310645
Stable rubberized bitumen concentrates are prepared by initially forming a mass comprising bitumen and crumb rubber particles in an amount of at least about 15 wt.% of the mass with the crumb rubber being swollen in-situ, and applying shear and temperature conditions to the mass to dissociate the vulcanizate network of the rubber particles and to incorporate the disgested vulcanizate into the bitumen. The stable rubberized bitumen concentrate is stable against sedimentation of rubber particles both following storage of the concentrate at about 320 ~F for 48 hours and dilution to a lower concentration in the ASTM solubility test.
L'invention concerne des concentrats de bitume caoutchoutés stables préparés en formant une masse comprenant des particules de bitume et de poudrette selon une quantité d'au moins 15 % en poids environ de la masse, la poudrette gonflant sur le site. Ce procédé consiste ensuite à appliquer des conditions de cisaillement et des températures à la masse pour dissocier le réseau du vulcanisat des particules de caoutchouc et incorporer le vulcanisat digéré dans le bitume. Le concentrat de bitume caoutchouté est stable par rapport à la sédimentation des particules de caoutchouc après le stockage du concentrat pendant 48 heures, à environ 320 ·F et dilution à une concentration inférieure dans l'essai de solubilité ASTM.
Polyphalt Inc.
Sim & Mcburney
LandOfFree
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