Mixtures of bitumen and olefin polymers suitable for...

C - Chemistry – Metallurgy – 08 – L

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C08L 95/00 (2006.01) C08L 23/10 (2006.01)

Patent

CA 2219005

Mixtures comprising bitumen and at least one polymer selected from (A) an essentially atactic propylene homopolymer, (B) an amorphous propylene copolymer with a C4-C10 .alpha.-olefin, and (C) an amorphous propylene copolymer with ethylene; said polymers (A) and (B) having the following characteristics: intrinsic viscosity (): greater than 1 dl/g; % (r) - % (m) > 0, where % (r) is the percentage of the syndiotactic dyads, and % (m) is the percentage of the isotactic dyads; less than 2 % of the CH2 groups are contained in the (CH2)n sequences where n 2; and Bernoulli index (B) = 1~0.2; said copolymer (C) having the following characteristics: the quantity of propylene in the copolymer (%P), expressed in mole percentage, and the EPE/(EPE+PPE+PPP) triad ratio satisfy the following equation: 0,01 %P + EPE/(EPE+PPE+PPP) 1; and less than 2 % of the CH2 groups are contained in the (CH2)n sequences where n is an even number.

L'invention concerne des mélanges contenant du bitume et au moins un polymère choisi parmi (A) un homopolymère de propylène essentiellement atactique, (B) un copolymère de propylène amorphe comprenant une .alpha.-oléfine C¿4?-C¿10?, et (C) un copolymère de propylène amorphe comprenant de l'éthylène. Les polymères (A) et (B) présentent les caractéristiques suivantes: viscosité intrinsèque (?) supérieure à 1 dl/g; % (r) - % (m) > 0, % (r) étant le pourcentage de dyades syndiotactiques, et % (m) est le pourcentage de dyades isotactiques; moins de 2 % des groupes CH¿2? sont contenus dans les séquences (CH¿2?)¿n?, n ? 2; et indice de Bernoulli (B) = 1±0,2. Le polymère (C) présente les caractéristiques suivantes: la quantité de propylène dans le copolymère (%P) exprimée en pourcentage en mole, et le rapport entre les tryades EPE/(EPE+PPE+PPP) correspond à l'équation 0,01 %P + EPE/(EPE+PPE+PPP) ? 1; et moins de 2 % des groupes CH¿2? sont contenus dans les séquences (CH¿2?)¿n? dans lesquelles n est un nombre pair.

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