| 摘要 |
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.
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